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1085 lines
35 KiB
1085 lines
35 KiB
/*==========================================================================
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*
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* Copyright (C) 1999 Microsoft Corporation. All Rights Reserved.
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*
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* File: agcva1.cpp
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* Content: Concrete class that implements CAutoGainControl
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*
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* History:
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* Date By Reason
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* ==== == ======
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* 12/01/99 pnewson Created it
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* 01/14/2000 rodtoll Plugged memory leak
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* 01/21/2000 pnewson Fixed false detection at start of audio stream
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* Raised VA_LOW_ENVELOPE from (2<<8) to (3<<8)
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* 01/24/2000 pnewson Fixed return code on Deinit
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* 01/31/2000 pnewson re-add support for absence of DVCLIENTCONFIG_AUTOSENSITIVITY flag
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* 02/08/2000 rodtoll Bug #131496 - Selecting DVSENSITIVITY_DEFAULT results in voice
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* never being detected
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* 03/03/2000 rodtoll Updated to handle alternative gamevoice build.
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* 04/20/2000 rodtoll Bug #32889 - Unable to run on non-admin accounts on Win2k
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* 04/20/2000 pnewson Tune AGC algorithm to make it more agressive at
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* raising the recording volume.
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* 04/25/2000 pnewson Fix to improve responsiveness of AGC when volume level too low
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* 12/07/2000 rodtoll WinBugs #48379: DPVOICE: AGC appears to be functioning incorrectly (restoring to old algorithm(
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*
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***************************************************************************/
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#include "dxvutilspch.h"
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/*
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How this voice activation code works:
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The idea is this. The power of the noise signal is pretty much constant over
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time. The power of a voice signal varies considerably over time. The power of
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a voice signal is not always high however. Weak frictive noises and such do not
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generate much power, but since they are part of a stream of speech, they represent
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a dip in the power, not a constant low power like the noise signal. We therefore
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associate changes in power with the presence of a voice signal.
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If it works as expected, this will allow us to detect voice activity even
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when the input volume, and therefore the total power of the signal, is very
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low. This in turn will allow the auto gain control code to be more effective.
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To estimate the power of the signal, we run the absolute value of the input signal
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through a recursive digital low pass filter. This gives us the "envelope" signal.
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[An alternative way to view this is a low frequency envelope signal modulated by a
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higher frequency carrier signal. We're extracting the low frequency envelope signal.]
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*/
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#undef DPF_SUBCOMP
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#define DPF_SUBCOMP DN_SUBCOMP_VOICE
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// the registry names where the AGC stuff is saved
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#define DPVOICE_REGISTRY_SAVEDAGCLEVEL L"SavedAGCLevel"
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// AGC_VOLUME_TICKSIZE
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//
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// The amount the recording volume should be changed
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// when AGC determines it is required.
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#define AGC_VOLUME_TICKSIZE 100
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/*
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// AGC_VOLUME_UPTICK
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//
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// The amount the recording volume should be increased
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// when the input level has been too low for a while.
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#define AGC_VOLUME_UPTICK 125
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// AGC_VOLUME_DOWNTICK
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//
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// The amount the recording volume should be increased
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// when the input level has been too high for a while.
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#define AGC_VOLUME_DOWNTICK 250
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*/
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// AGC_VOLUME_INITIAL_UPTICK
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//
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// When the AGC level is loaded from the registry, this
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// amount is added to it as an initial boost, since it
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// is much easier and faster to lower the recording level
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// via AGC than it is to raise it.
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#define AGC_VOLUME_INITIAL_UPTICK 500
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// AGC_VOLUME_MINIMUM
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//
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// The minimum volume setting allowed.
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// Make sure it's above 0, this mutes some cards
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#define AGC_VOLUME_MINIMUM (DSBVOLUME_MIN+AGC_VOLUME_TICKSIZE)
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// AGC_VOLUME_MAXIMUM
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//
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// The maximum volume setting allowed.
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#define AGC_VOLUME_MAXIMUM DSBVOLUME_MAX
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// AGC_VOLUME_LEVELS
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//
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// How many possible volume levels are there?
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#define AGC_VOLUME_LEVELS ((DV_ABS(AGC_VOLUME_MAXIMUM - AGC_VOLUME_MINIMUM) / AGC_VOLUME_TICKSIZE) + 1)
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/*
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// AGC_REDUCTION_THRESHOLD
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//
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// The peak level at which the recording volume
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// must be reduced
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#define AGC_REDUCTION_THRESHOLD 98
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// AGC_INCREASE_THRESHOLD
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//
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// If the user's input remains under this threshold
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// for an extended period of time, we will consider
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// raising the input level.
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#define AGC_INCREASE_THRESHOLD 70
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// AGC_INCREASE_THRESHOLD_TIME
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//
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// How long must the input remain uner the increase
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// threshold to trigger in increase? (measured
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// in milliseconds
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#define AGC_INCREASE_THRESHOLD_TIME 500
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*/
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// AGC_PEAK_CLIPPING_THRESHOLD
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//
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// The peak value at or above which we consider the
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// input signal to be clipping.
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#define AGC_PEAK_CLIPPING_THRESHOLD 0x7e00
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/*
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// AGC_ENV_CLIPPING_THRESHOLD
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//
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// When we detect clipping via the threshold above,
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// the 16 bit normalized envelope signal must be above
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// this threshold for us to lower the input volume.
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// This allows us to ignore intermittent spikes in
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// the input.
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#define AGC_ENV_CLIPPING_THRESHOLD 0x2000
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// AGC_ENV_CLIPPING_COUNT_THRESHOLD
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//
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// For how many envelope samples does the envelope
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// signal need to stay above the threshold value
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// above in order to take the volume down a tick?
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#define AGC_ENV_CLIPPING_COUNT_THRESHOLD 10
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*/
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// AGC_IDEAL_CLIPPING_RATIO
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//
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// What is the ideal ratio of clipped to total samples?
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// E.g. a value of 0.005 says that we would like 5 out of
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// every 1000 samples to clip. If we are getting less clipping,
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// the volume should be increased. If we are getting more,
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// the volume should be reduced.
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//
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// Note: only samples that are part of a frame detected as
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// speech are considered.
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#define AGC_IDEAL_CLIPPING_RATIO 0.0005
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// AGC_CHANGE_THRESHOLD
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//
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// How far from the ideal does a volume level have to
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// stray before we will consider changing the volume?
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//
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// E.g. If this value is 1.05, the history for a volume
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// level would have to be 5% above or below the ideal
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// value in order to have an AGC correction made.
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#define AGC_CHANGE_THRESHOLD 1.01
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// AGC_CLIPPING_HISTORY
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//
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// How many milliseconds of history should we keep regarding
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// the clipping behavior at a particular volume setting?
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// E.g. a value of 10000 means that we remember the last
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// 10 seconds of activity at each volume level.
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//
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// Note: only samples that are part of a frame detected as
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// speech are considered.
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#define AGC_CLIPPING_HISTORY 1000
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//#define AGC_CLIPPING_HISTORY 2000
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//#define AGC_CLIPPING_HISTORY 5000
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//#define AGC_CLIPPING_HISTORY 10000
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//#define AGC_CLIPPING_HISTORY 30000 // it took AGC too long to recover
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// from low volume leves with this
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// setting
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// AGC_FEEDBACK_ENV_THRESHOLD
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//
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// To detect a feedback condition, we check to see if the
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// envelope signal has a value larger than AGC_FEEDBACK_ENV_THRESHOLD.
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// If the envelope signal stays consistently above this level,
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// for longer than AGC_FEEDBACK_TIME_THRESHOLD milliseconds, we conclude
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// that feedback is occuring. Voice has a changing envelope, and will
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// dip below the threshold on a regular basis. Feedback will not.
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// This will allow us to automatically reduce the input volume
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// when feedback is detected.
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#define AGC_FEEDBACK_ENV_THRESHOLD 2500
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#define AGC_FEEDBACK_TIME_THRESHOLD 1000
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// AGC_DEADZONE_THRESHOLD
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//
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// If the input signal never goes above this value
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// (16bits, promoted if required) for the deadzone time,
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// then we consider the input to be in the dead zone,
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// and the volume should be upticked.
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// #define AGC_DEADZONE_THRESHOLD 0 // This is too low - it does not reliably detect the deadzone
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#define AGC_DEADZONE_THRESHOLD (1 << 8)
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// AGC_DEADZONE_TIME
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//
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// How long we have to be in the deadzone before
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// the deadzone increase kicks in - we need this to
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// be longer than just one frame, or we get false
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// positives.
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#define AGC_DEADZONE_TIME 1000
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// VA_HIGH_DELTA
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//
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// If the percent change in the envelope signal is greater
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// than this value, voice is detected. Each point of this
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// value is equal to 0.1%. E.g. 4000 == 400% increase.
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// An unchanging signal produces a 100% value.
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//#define VA_HIGH_DELTA 2000
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//#define VA_HIGH_DELTA_FASTSLOW 0x7fffffff // select this to factor out this VA parameter
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//#define VA_HIGH_DELTA_FASTSLOW 1400
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//#define VA_HIGH_DELTA_FASTSLOW 1375 // current choice
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//#define VA_HIGH_DELTA_FASTSLOW 1350
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//#define VA_HIGH_DELTA_FASTSLOW 1325
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//#define VA_HIGH_DELTA_FASTSLOW 1300
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//#define VA_HIGH_DELTA_FASTSLOW 1275
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//#define VA_HIGH_DELTA_FASTSLOW 1250
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//#define VA_HIGH_DELTA_FASTSLOW 1200
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//#define VA_HIGH_DELTA_FASTSLOW 1175 // catches all noise
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//#define VA_HIGH_DELTA_FASTSLOW 1150 // catches all noise
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//#define VA_HIGH_DELTA_FASTSLOW 1125 // catches all noise
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//#define VA_HIGH_DELTA_FASTSLOW 1100 // catches all noise
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// VA_LOW_DELTA
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//
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// If the percent change in the envelope signal is lower
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// than this value, voice is detected. Each point of this
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// value is equal to 0.1%. E.g. 250 == 25% increase
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// (i.e a decrease to 1/4 the original signal strength).
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// An unchanging signal produces a 100% value.
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//#define VA_LOW_DELTA 500
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//#define VA_LOW_DELTA_FASTSLOW 0 // select this to factor out this VA parameter
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//#define VA_LOW_DELTA_FASTSLOW 925
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//#define VA_LOW_DELTA_FASTSLOW 900
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//#define VA_LOW_DELTA_FASTSLOW 875
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//#define VA_LOW_DELTA_FASTSLOW 850
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//#define VA_LOW_DELTA_FASTSLOW 825
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//#define VA_LOW_DELTA_FASTSLOW 800
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//#define VA_LOW_DELTA_FASTSLOW 775 // current choice
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//#define VA_LOW_DELTA_FASTSLOW 750
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//#define VA_LOW_DELTA_FASTSLOW 725
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//#define VA_LOW_DELTA_FASTSLOW 700
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//#define VA_LOW_DELTA_FASTSLOW 675
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//#define VA_LOW_DELTA_FASTSLOW 650
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// The following VA parameters were optimized for what I believe to be
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// the hardest configuration: A cheap open stick mic with external speakers,
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// with Echo Suppression turned on. Echo suppression penalizes false positives
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// harshly, since the receiver cannot send which receiving the "noise". If
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// the VA parameters work for this case, then they should be fine for the
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// much better signal to noise ratio provided by a headset or collar mic.
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// (As long as the user does not breathe directly on the headset mic.)
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//
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// Two source-to-mic distances were tested during tuning.
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//
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// 1) Across an enclosed office (approx 8 to 10 feet)
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// 2) Seated at the workstation (approx 16 to 20 inches)
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//
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// At distance 1, the AGC was never invoked, gain was at 100%
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// At distance 2, the AGC would take the mic down a few ticks.
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//
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// The office enviroment had the background noise from 3 computers,
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// a ceiling vent, and a surprisingly noisy fan from the ethernet
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// hub. There is no background talking, cars, trains, or things of
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// that nature.
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//
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// Each parameter was tuned separately to reject 100% of the
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// background noise for case 1 (gain at 100%).
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//
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// Then they were tested together to see if they could detect
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// across the room speech.
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//
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// Individually, none of the detection criteria could reliably
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// detect all of the across the room speech. Together, they did
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// not do much better. They even missed some speech while seated.
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// Not very satifactory.
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//
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// Therefore, I decided to abandon the attempt to detect across
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// the room speech. I retuned the parameters to reject noise
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// after speaking while seated (which allowed AGC to reduce
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// the volume a couple of ticks, thereby increasing the signal
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// to noise ratio) and to reliably detect seated speech.
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//
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// I also found that the "fast" envelope signal was better at
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// detecting speech than the "slow" one in a straight threshold
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// comparison, so it is used in the VA tests.
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//
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// VA_HIGH_PERCENT
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//
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// If the fast envelope signal is more than this percentage
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// higher than the slow envelope signal, speech is detected.
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//
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#define VA_HIGH_PERCENT 170 // rejects most noise, still catches some.
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// decent voice detection. Catches the beginning
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// of speech a majority of the time, but does miss
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// once in a while. Will often drop out partway
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// into a phrase when used alone. Must test in
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// conjunction with VA_LOW_PERCENT.
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//
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// After testing in conjunction with VA_LOW_PERCENT,
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// the performance is reasonable. Low input volume
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// signals are usually detected ok, but dropouts are
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// a bit common. However, noise is sometimes still
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// detected, so making these parameters more sensitive
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// would not be useful.
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//#define VA_HIGH_PERCENT 165 // catches occational noise
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//#define VA_HIGH_PERCENT 160 // catches too much noise
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//#define VA_HIGH_PERCENT 150 // catches most noise
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//#define VA_HIGH_PERCENT 140 // catches almost all noise
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//#define VA_HIGH_PERCENT 0x00007fff // select this to factor out this VA parameter
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// VA_LOW_PERCENT
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//
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// If the fast envelope signal is more than this percentage
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// lower than the slow envelope signal, speech is detected.
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//
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#define VA_LOW_PERCENT 50 // excellent noise rejection. poor detection of speech.
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// when used alone, could miss entire phrases. Must evaluate
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// in conjunction with tuned VA_HIGH_PERCENT
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//
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// See note above re: testing in conjunction with VA_HIGH_PERCENT
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//#define VA_LOW_PERCENT 55 // still catches too much noise
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//#define VA_LOW_PERCENT 60 // catches most noise
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//#define VA_LOW_PERCENT 65 // catches most noise
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//#define VA_LOW_PERCENT 70 // still catches almost all noise
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//#define VA_LOW_PERCENT 75 // catches almost all noise
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//#define VA_LOW_PERCENT 80 // catches all noise
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//#define VA_LOW_PERCENT 0 // select this to factor out this VA parameter
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// VA_HIGH_ENVELOPE
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//
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// If the 16 bit normalized value of the envelope exceeds
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// this number, the signal is considered voice.
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//
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//#define VA_HIGH_ENVELOPE (15 << 8) // still catches high gain noise, starting to get
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// speech dropouts, when "p" sounds lower the gain
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#define VA_HIGH_ENVELOPE (14 << 8) // Noise immunity good at "seated" S/N ratio. No speech
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// dropouts encountered. Still catches noise at full gain.
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//#define VA_HIGH_ENVELOPE (13 << 8) // Noise immunity not as good as expected (new day).
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//#define VA_HIGH_ENVELOPE (12 << 8) // Good noise immunity. Speech recognition excellent.
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// Only one dropout occured in the test with a 250ms
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// hangover. I think the hangover time should be increased
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// above 250 however, because a comma (properly read) tends
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// to cause a dropout. I'm going to tune the hangover time,
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// and return to this test.
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//
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// Hangover time is now 400ms. No dropouts occur with
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// "seated" speech.
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//#define VA_HIGH_ENVELOPE (11 << 8) // Catches almost no noise at "seated" gain
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// however, if the gain creeped up a bit, noise would
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// be detected. I therefore think a slightly higher
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// threshold would be a good idea. The speech recognition
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// based on only this parameter at this level was flawless.
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// No dropouts at all with a 250 ms hangover time. (commas
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// excepted).
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//#define VA_HIGH_ENVELOPE (10 << 8) // catches some noise at "seated" gain - getting very close
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//#define VA_HIGH_ENVELOPE (9 << 8) // catches some noise at "seated" gain - getting close
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//#define VA_HIGH_ENVELOPE (8 << 8) // catches noise at "seated" gain
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//#define VA_HIGH_ENVELOPE (7 << 8) // catches noise at "seated" gain
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//#define VA_HIGH_ENVELOPE (0x7fffffff) // select this to factor out this VA parameter
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// VA_LOW_ENVELOPE
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//
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// If the 16 bit normalized value of the envelope is below
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// this number, the signal will never be considered voice.
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// This reduces some false positives on the delta checks
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// at very low signal levels
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#define VA_LOW_ENVELOPE (3 << 8)
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//#define VA_LOW_ENVELOPE (2 << 8) // causes false VA at low input volumes
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//#define VA_LOW_ENVELOPE (1 << 8) // causes false VA at low input volumes
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// VA_HANGOVER_TIME
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//
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// The time, in milliseconds, that voice activation sticks in
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// the ON position following a voice detection. E.g. a value of 500
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// means that voice will always be transmitted in at least 1/2 second
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// bursts.
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//
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// I am trying to tune this so that a properly read comma will not cause
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// a dropout. This will give the user a bit of leeway to pause in the
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// speech stream without losing the floor when in Echo Suppression mode.
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// It will also prevent dropouts even when not in Echo Suppression mode
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#define VA_HANGOVER_TIME 400 // this gives satisfying performance
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//#define VA_HANGOVER_TIME 375 // almost there, longest commas still goners
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//#define VA_HANGOVER_TIME 350 // still drops long commas
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//#define VA_HANGOVER_TIME 325 // does not drop fast commas, drops long ones
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//#define VA_HANGOVER_TIME 300 // drops almost no commas, quite good
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//#define VA_HANGOVER_TIME 275 // drops about half of the commas
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//#define VA_HANGOVER_TIME 250 // commas are always dropped
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// macros to avoid clib dependencies
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#define DV_ABS(a) ((a) < 0 ? -(a) : (a))
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#define DV_MAX(a, b) ((a) > (b) ? (a) : (b))
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#define DV_MIN(a, b) ((a) < (b) ? (a) : (b))
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// A function to lookup the log of n base 1.354 (sort of)
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// where 0 <= n <= 127
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//
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// Why the heck do we care about log n base 1.354???
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//
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// What we need is a function that maps 0 to 127 down to 0 to 15
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// in a nice, smooth non-linear fashion that has more fidelity at
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// the low end than at the high end.
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//
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// The function is actually floor(log(n, 1.354), 1) to keep things
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// in the integer realm.
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//
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// Why 1.354? Because log(128, 1.354) = 16, so we are using the full
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// range from 0 to 15.
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//
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// This function also cheats and just defines fn(0) = 0 and fn(1) = 1
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// for convenience.
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|
BYTE DV_LOG_1_354_lookup_table[95] =
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{
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0, 1, 2, 3, 4, 5, 5, 6, // 0.. 7
|
|
6, 7, 7, 7, 8, 8, 8, 8, // 8.. 15
|
|
9, 9, 9, 9, 9, 10, 10, 10, // 16.. 23
|
|
10, 10, 10, 10, 10, 11, 11, 11, // 24.. 31
|
|
11, 11, 11, 11, 11, 11, 12, 12, // 32.. 39
|
|
12, 12, 12, 12, 12, 12, 12, 12, // 40.. 47
|
|
12, 12, 12, 12, 13, 13, 13, 13, // 48.. 55
|
|
13, 13, 13, 13, 13, 13, 13, 13, // 56.. 63
|
|
13, 13, 13, 13, 13, 13, 14, 14, // 64.. 71
|
|
14, 14, 14, 14, 14, 14, 14, 14, // 72.. 79
|
|
14, 14, 14, 14, 14, 14, 14, 14, // 80.. 87
|
|
14, 14, 14, 14, 14, 14, 14 // 88.. 94 - stop table at 94 here, everything above is 15
|
|
};
|
|
|
|
BYTE DV_log_1_354(BYTE n)
|
|
{
|
|
if (n > 94) return 15;
|
|
return DV_LOG_1_354_lookup_table[n];
|
|
}
|
|
|
|
// function to lookup the base 2 log of (n) where n is 16 bits unsigned
|
|
// except that we cheat and say that log_2 of zero is zero
|
|
// and we chop of any decimals.
|
|
BYTE DV_log_2(WORD n)
|
|
{
|
|
if (n & 0x8000)
|
|
{
|
|
return 0x0f;
|
|
}
|
|
if (n & 0x4000)
|
|
{
|
|
return 0x0e;
|
|
}
|
|
if (n & 0x2000)
|
|
{
|
|
return 0x0d;
|
|
}
|
|
if (n & 0x1000)
|
|
{
|
|
return 0x0c;
|
|
}
|
|
if (n & 0x0800)
|
|
{
|
|
return 0x0b;
|
|
}
|
|
if (n & 0x0400)
|
|
{
|
|
return 0x0a;
|
|
}
|
|
if (n & 0x0200)
|
|
{
|
|
return 0x09;
|
|
}
|
|
if (n & 0x0100)
|
|
{
|
|
return 0x08;
|
|
}
|
|
if (n & 0x0080)
|
|
{
|
|
return 0x07;
|
|
}
|
|
if (n & 0x0040)
|
|
{
|
|
return 0x06;
|
|
}
|
|
if (n & 0x0020)
|
|
{
|
|
return 0x05;
|
|
}
|
|
if (n & 0x0010)
|
|
{
|
|
return 0x04;
|
|
}
|
|
if (n & 0x0008)
|
|
{
|
|
return 0x03;
|
|
}
|
|
if (n & 0x0004)
|
|
{
|
|
return 0x02;
|
|
}
|
|
if (n & 0x0002)
|
|
{
|
|
return 0x01;
|
|
}
|
|
return 0x00;
|
|
}
|
|
|
|
#undef DPF_MODNAME
|
|
#define DPF_MODNAME "CAGCVA1::Init"
|
|
//
|
|
// Init - initializes the AGC and VA algorithms, including loading saved
|
|
// values from registry.
|
|
//
|
|
// dwFlags - the dwFlags from the dvClientConfig structure
|
|
// guidCaptureDevice - the capture device we're performing AGC for
|
|
// plInitVolume - the initial volume level is written here
|
|
//
|
|
HRESULT CAGCVA1::Init(
|
|
const WCHAR *wszBasePath,
|
|
DWORD dwFlags,
|
|
GUID guidCaptureDevice,
|
|
int iSampleRate,
|
|
int iBitsPerSample,
|
|
LONG* plInitVolume,
|
|
DWORD dwSensitivity)
|
|
{
|
|
// Remember the number of bits per sample, if valid
|
|
if (iBitsPerSample != 8 && iBitsPerSample != 16)
|
|
{
|
|
DPFX(DPFPREP,DVF_ERRORLEVEL, "Unexpected number of bits per sample!");
|
|
return DVERR_INVALIDPARAM;
|
|
}
|
|
m_iBitsPerSample = iBitsPerSample;
|
|
|
|
// Remember the flags
|
|
m_dwFlags = dwFlags;
|
|
|
|
// Remember the sensitivity
|
|
m_dwSensitivity = dwSensitivity;
|
|
|
|
// Figure out the shift constants for this sample rate
|
|
m_iShiftConstantFast = (DV_log_2((iSampleRate * 2) / 1000) + 1);
|
|
|
|
// This gives the slow filter a cutoff frequency 1/4 of
|
|
// the fast filter
|
|
m_iShiftConstantSlow = m_iShiftConstantFast + 2;
|
|
|
|
// Figure out how often we should sample the envelope signal
|
|
// to measure its change. This of course depends on the sample
|
|
// rate. The cutoff frequency allowed by the calculation
|
|
// above is between 40 and 80 Hz. Therefore we'll sample the
|
|
// envelope signal at about 100 Hz.
|
|
m_iEnvelopeSampleRate = iSampleRate / 100;
|
|
|
|
// Figure out the number of samples in the configured
|
|
// hangover time.
|
|
m_iHangoverSamples = (VA_HANGOVER_TIME * iSampleRate) / 1000;
|
|
m_iCurHangoverSamples = m_iHangoverSamples+1;
|
|
|
|
// Figure out the number of samples in the configured dead zone time
|
|
m_iDeadZoneSampleThreshold = (AGC_DEADZONE_TIME * iSampleRate) / 1000;
|
|
|
|
// Figure out the number of samples in the configured
|
|
// feedback threshold time.
|
|
m_iFeedbackSamples = (AGC_FEEDBACK_TIME_THRESHOLD * iSampleRate) / 1000;
|
|
|
|
// Start the envelope signal at zero
|
|
m_iCurEnvelopeValueFast = 0;
|
|
m_iCurEnvelopeValueSlow = 0;
|
|
m_iPrevEnvelopeSample = 0;
|
|
m_iCurSampleNum = 0;
|
|
|
|
// We're not clipping now
|
|
//m_fClipping = 0;
|
|
//m_iClippingCount = 0;
|
|
|
|
DPFX(DPFPREP,DVF_INFOLEVEL, "AGCVA1:INIT:%i,%i,%i,%i,%i",
|
|
iSampleRate,
|
|
m_iShiftConstantFast,
|
|
m_iShiftConstantSlow,
|
|
m_iEnvelopeSampleRate,
|
|
m_iHangoverSamples);
|
|
|
|
// Save the guid in our local member...
|
|
m_guidCaptureDevice = guidCaptureDevice;
|
|
|
|
wcscpy( m_wszRegPath, wszBasePath );
|
|
wcscat( m_wszRegPath, DPVOICE_REGISTRY_AGC );
|
|
|
|
// if the AGC reset flag is set, reset the AGC parameters,
|
|
// otherwise grab them from the registry
|
|
if (m_dwFlags & DVCLIENTCONFIG_AUTOVOLUMERESET)
|
|
{
|
|
m_lCurVolume = DSBVOLUME_MAX;
|
|
}
|
|
else
|
|
{
|
|
CRegistry cregBase;
|
|
if( !cregBase.Open( HKEY_CURRENT_USER, m_wszRegPath, FALSE, TRUE ) )
|
|
{
|
|
m_lCurVolume = DSBVOLUME_MAX;
|
|
}
|
|
else
|
|
{
|
|
CRegistry cregCapture;
|
|
if (!cregCapture.Open( cregBase.GetHandle(), &m_guidCaptureDevice ), FALSE, TRUE )
|
|
{
|
|
m_lCurVolume = DSBVOLUME_MAX;
|
|
}
|
|
if (!cregCapture.ReadDWORD( DPVOICE_REGISTRY_SAVEDAGCLEVEL, (DWORD*)&m_lCurVolume ))
|
|
{
|
|
m_lCurVolume = DSBVOLUME_MAX;
|
|
}
|
|
else
|
|
{
|
|
// boost the saved volume a bit
|
|
m_lCurVolume += AGC_VOLUME_INITIAL_UPTICK;
|
|
if (m_lCurVolume > DSBVOLUME_MAX)
|
|
{
|
|
m_lCurVolume = DSBVOLUME_MAX;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
// zero out the historgrams
|
|
memset(m_rgdwPeakHistogram, 0, CAGCVA1_HISTOGRAM_BUCKETS*sizeof(DWORD));
|
|
memset(m_rgdwZeroCrossingsHistogram, 0, CAGCVA1_HISTOGRAM_BUCKETS*sizeof(DWORD));
|
|
*/
|
|
|
|
// allocate the memory for the AGC history
|
|
m_rgfAGCHistory = new float[AGC_VOLUME_LEVELS];
|
|
if (m_rgfAGCHistory == NULL)
|
|
{
|
|
return DVERR_OUTOFMEMORY;
|
|
}
|
|
|
|
// initialize the history to the ideal value
|
|
for (int iIndex = 0; iIndex < AGC_VOLUME_LEVELS; ++iIndex)
|
|
{
|
|
m_rgfAGCHistory[iIndex] = (float)AGC_IDEAL_CLIPPING_RATIO;
|
|
}
|
|
|
|
m_dwHistorySamples = (iSampleRate * AGC_CLIPPING_HISTORY) / 1000;
|
|
|
|
// stuff the initial volume into the caller's variable
|
|
*plInitVolume = m_lCurVolume;
|
|
|
|
return DV_OK;
|
|
}
|
|
|
|
#undef DPF_MODNAME
|
|
#define DPF_MODNAME "CAGCVA1::Deinit"
|
|
//
|
|
// Deinit - saves the current AGC and VA state to the registry for use next session
|
|
//
|
|
HRESULT CAGCVA1::Deinit()
|
|
{
|
|
HRESULT hr = DV_OK;
|
|
CRegistry cregBase;
|
|
if(cregBase.Open( HKEY_CURRENT_USER, m_wszRegPath, FALSE, TRUE ) )
|
|
{
|
|
CRegistry cregDevice;
|
|
if (cregDevice.Open( cregBase.GetHandle(), &m_guidCaptureDevice, FALSE, TRUE))
|
|
{
|
|
if (!cregDevice.WriteDWORD( DPVOICE_REGISTRY_SAVEDAGCLEVEL, (DWORD&)m_lCurVolume ))
|
|
{
|
|
DPFX(DPFPREP,DVF_ERRORLEVEL, "Error writing AGC settings to registry");
|
|
hr = DVERR_WIN32;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
DPFX(DPFPREP,DVF_ERRORLEVEL, "Error writing AGC settings to registry");
|
|
hr = DVERR_WIN32;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
DPFX(DPFPREP,DVF_ERRORLEVEL, "Error writing AGC settings to registry");
|
|
hr = DVERR_WIN32;
|
|
}
|
|
|
|
delete [] m_rgfAGCHistory;
|
|
|
|
return hr;
|
|
}
|
|
|
|
#undef DPF_MODNAME
|
|
#define DPF_MODNAME "CAGCVA1::SetSensitivity"
|
|
HRESULT CAGCVA1::SetSensitivity(DWORD dwFlags, DWORD dwSensitivity)
|
|
{
|
|
if (dwFlags & DVCLIENTCONFIG_AUTOVOICEACTIVATED)
|
|
{
|
|
m_dwFlags |= DVCLIENTCONFIG_AUTOVOICEACTIVATED;
|
|
}
|
|
else
|
|
{
|
|
m_dwFlags &= ~DVCLIENTCONFIG_AUTOVOICEACTIVATED;
|
|
}
|
|
m_dwSensitivity = dwSensitivity;
|
|
return DV_OK;
|
|
}
|
|
|
|
#undef DPF_MODNAME
|
|
#define DPF_MODNAME "CAGCVA1::GetSensitivity"
|
|
HRESULT CAGCVA1::GetSensitivity(DWORD* pdwFlags, DWORD* pdwSensitivity)
|
|
{
|
|
if (m_dwFlags & DVCLIENTCONFIG_AUTORECORDVOLUME)
|
|
{
|
|
*pdwFlags |= DVCLIENTCONFIG_AUTORECORDVOLUME;
|
|
}
|
|
else
|
|
{
|
|
*pdwFlags &= ~DVCLIENTCONFIG_AUTORECORDVOLUME;
|
|
}
|
|
*pdwSensitivity = m_dwSensitivity;
|
|
return DV_OK;
|
|
}
|
|
|
|
#undef DPF_MODNAME
|
|
#define DPF_MODNAME "CAGCVA1::AnalyzeData"
|
|
//
|
|
// AnaylzeData - performs the AGC & VA calculations on one frame of audio
|
|
//
|
|
// pbAudioData - pointer to a buffer containing the audio data
|
|
// dwAudioDataSize - size, in bytes, of the audio data
|
|
//
|
|
HRESULT CAGCVA1::AnalyzeData(BYTE* pbAudioData, DWORD dwAudioDataSize /*, DWORD dwFrameTime*/)
|
|
{
|
|
int iMaxValue;
|
|
//int iValue;
|
|
int iValueAbs;
|
|
//int iZeroCrossings;
|
|
int iIndex;
|
|
int iMaxPossiblePeak;
|
|
int iNumberOfSamples;
|
|
//BYTE bPeak255;
|
|
|
|
//m_dwFrameTime = dwFrameTime;
|
|
|
|
if (dwAudioDataSize < 1)
|
|
{
|
|
DPFX(DPFPREP,DVF_ERRORLEVEL, "Error: Audio Data Size < 1");
|
|
return DVERR_INVALIDPARAM;
|
|
}
|
|
|
|
// new algorithm...
|
|
|
|
// cast the audio data to signed 16 bit integers
|
|
const signed short* psiAudioData = (signed short *)pbAudioData;
|
|
|
|
if (m_iBitsPerSample == 16)
|
|
{
|
|
iNumberOfSamples = dwAudioDataSize / 2;
|
|
iMaxPossiblePeak = 0x7fff;
|
|
}
|
|
else
|
|
{
|
|
iNumberOfSamples = dwAudioDataSize;
|
|
iMaxPossiblePeak = 0x7f00;
|
|
}
|
|
|
|
m_fDeadZoneDetected = TRUE;
|
|
m_iClippingSampleCount = 0;
|
|
m_iNonClippingSampleCount = 0;
|
|
m_fVoiceDetectedThisFrame = FALSE;
|
|
iMaxValue = 0;
|
|
for (iIndex = 0; iIndex < (int)iNumberOfSamples; ++iIndex)
|
|
{
|
|
++m_iCurSampleNum;
|
|
|
|
// extract a sample
|
|
if (m_iBitsPerSample == 8)
|
|
{
|
|
iValueAbs = DV_ABS((int)pbAudioData[iIndex] - 0x80);
|
|
// promote it to 16 bits
|
|
iValueAbs <<= 8;
|
|
}
|
|
else
|
|
{
|
|
iValueAbs = DV_ABS((int)psiAudioData[iIndex]);
|
|
}
|
|
|
|
// see if it is the new peak value
|
|
iMaxValue = DV_MAX(iValueAbs, iMaxValue);
|
|
|
|
// do the low pass filtering, but only if we are in autosensitivity mode
|
|
int iNormalizedCurEnvelopeValueFast;
|
|
int iNormalizedCurEnvelopeValueSlow;
|
|
if (m_dwFlags & DVCLIENTCONFIG_AUTOVOICEACTIVATED)
|
|
{
|
|
m_iCurEnvelopeValueFast =
|
|
iValueAbs +
|
|
(m_iCurEnvelopeValueFast - (m_iCurEnvelopeValueFast >> m_iShiftConstantFast));
|
|
iNormalizedCurEnvelopeValueFast = m_iCurEnvelopeValueFast >> m_iShiftConstantFast;
|
|
|
|
m_iCurEnvelopeValueSlow =
|
|
iValueAbs +
|
|
(m_iCurEnvelopeValueSlow - (m_iCurEnvelopeValueSlow >> m_iShiftConstantSlow));
|
|
iNormalizedCurEnvelopeValueSlow = m_iCurEnvelopeValueSlow >> m_iShiftConstantSlow;
|
|
|
|
// check to see if we consider this voice
|
|
if (iNormalizedCurEnvelopeValueFast > VA_LOW_ENVELOPE &&
|
|
(iNormalizedCurEnvelopeValueFast > VA_HIGH_ENVELOPE ||
|
|
iNormalizedCurEnvelopeValueFast > (VA_HIGH_PERCENT * iNormalizedCurEnvelopeValueSlow) / 100 ||
|
|
iNormalizedCurEnvelopeValueFast < (VA_LOW_PERCENT * iNormalizedCurEnvelopeValueSlow) / 100 ))
|
|
{
|
|
m_fVoiceDetectedNow = TRUE;
|
|
m_fVoiceDetectedThisFrame = TRUE;
|
|
m_fVoiceHangoverActive = TRUE;
|
|
m_iCurHangoverSamples = 0;
|
|
}
|
|
else
|
|
{
|
|
m_fVoiceDetectedNow = FALSE;
|
|
++m_iCurHangoverSamples;
|
|
if (m_iCurHangoverSamples > m_iHangoverSamples)
|
|
{
|
|
m_fVoiceHangoverActive = FALSE;
|
|
}
|
|
else
|
|
{
|
|
m_fVoiceHangoverActive = TRUE;
|
|
m_fVoiceDetectedThisFrame = TRUE;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
DPFX(DPFPREP,DVF_WARNINGLEVEL, "AGCVA1:VA,%i,%i,%i,%i,%i,%i",
|
|
iValueAbs,
|
|
iNormalizedCurEnvelopeValueFast,
|
|
iNormalizedCurEnvelopeValueSlow,
|
|
m_fVoiceDetectedNow,
|
|
m_fVoiceHangoverActive,
|
|
m_fVoiceDetectedThisFrame);
|
|
*/
|
|
|
|
// check for clipping
|
|
if (iValueAbs > AGC_PEAK_CLIPPING_THRESHOLD)
|
|
{
|
|
++m_iClippingSampleCount;
|
|
}
|
|
else
|
|
{
|
|
++m_iNonClippingSampleCount;
|
|
}
|
|
}
|
|
|
|
// Normalize the peak value to the range DVINPUTLEVEL_MIN to DVINPUTLEVEL_MAX
|
|
// This is what is returned for caller's peak meters...
|
|
m_bPeak = (BYTE)(DVINPUTLEVEL_MIN +
|
|
((iMaxValue * (DVINPUTLEVEL_MAX - DVINPUTLEVEL_MIN)) / iMaxPossiblePeak));
|
|
|
|
// if we are in manual VA mode (not autovolume) check the peak against
|
|
// the sensitivity threshold
|
|
if (!(m_dwFlags & DVCLIENTCONFIG_AUTOVOICEACTIVATED))
|
|
{
|
|
if (m_bPeak > m_dwSensitivity)
|
|
{
|
|
m_fVoiceDetectedThisFrame = TRUE;
|
|
}
|
|
}
|
|
|
|
// Check if we're in a deadzone
|
|
if (iMaxValue > AGC_DEADZONE_THRESHOLD)
|
|
{
|
|
m_fDeadZoneDetected = FALSE;
|
|
}
|
|
|
|
|
|
DPFX(DPFPREP,DVF_INFOLEVEL, "AGCVA1:ANA,%i,%i,%i,%i,%i,%i",
|
|
m_bPeak,
|
|
iMaxValue,
|
|
m_fVoiceDetectedThisFrame,
|
|
m_fDeadZoneDetected,
|
|
m_iClippingSampleCount,
|
|
m_iNonClippingSampleCount);
|
|
|
|
return DV_OK;
|
|
}
|
|
|
|
#undef DPF_MODNAME
|
|
#define DPF_MODNAME "CAGCVA1::AGCResults"
|
|
//
|
|
// AGCResults - returns the AGC results from the previous AnalyzeFrame call
|
|
//
|
|
// lCurVolume - the current recording volume
|
|
// plNewVolume - stuffed with the desired new recording volume
|
|
//
|
|
HRESULT CAGCVA1::AGCResults(LONG lCurVolume, LONG* plNewVolume, BOOL fTransmitFrame)
|
|
{
|
|
// default to keeping the same volume
|
|
*plNewVolume = lCurVolume;
|
|
|
|
// Figure out what volume level we're at
|
|
int iVolumeLevel = DV_MIN(DV_ABS(AGC_VOLUME_MAXIMUM - lCurVolume) / AGC_VOLUME_TICKSIZE,
|
|
AGC_VOLUME_LEVELS - 1);
|
|
|
|
//DPFX(DPFPREP, DVF_INFOLEVEL, "AGCVA1:AGC,Cur Volume:%i,%i",lCurVolume, iVolumeLevel);
|
|
|
|
// Don't make another adjustment if we have just done one.
|
|
// This ensures that when we start looking at input data
|
|
// again, it will be post-adjustment data.
|
|
if( m_fAGCLastFrameAdjusted )
|
|
{
|
|
m_fAGCLastFrameAdjusted = FALSE;
|
|
}
|
|
else
|
|
{
|
|
// check for a dead zone condition
|
|
if (m_fDeadZoneDetected /* || m_rgfAGCHistory[iVolumeLevel] == 0.0 */)
|
|
{
|
|
// We may be in the dead zone (volume way too low).
|
|
// Before we take the drastic action of sweepting the volume
|
|
// up, make sure we've been here long enough to be sure
|
|
// we're too low.
|
|
m_iDeadZoneSamples += (m_iClippingSampleCount + m_iNonClippingSampleCount);
|
|
if (m_iDeadZoneSamples > m_iDeadZoneSampleThreshold)
|
|
{
|
|
// The input volume has been lowered too far. We're not
|
|
// getting any input at all. To remedy this situation,
|
|
// we'll boost the volume now, but we'll also mark this
|
|
// volume level as off limits by setting its history to
|
|
// zero. That will prevent the volume from ever being
|
|
// dropped to this level again during this session.
|
|
if (iVolumeLevel != 0)
|
|
{
|
|
// We also reset the history of the volume level we are going to,
|
|
// so we start with a clean slate.
|
|
m_rgfAGCHistory[iVolumeLevel-1] = (const float)AGC_IDEAL_CLIPPING_RATIO;
|
|
*plNewVolume = DV_MIN(lCurVolume + AGC_VOLUME_TICKSIZE, AGC_VOLUME_MAXIMUM);
|
|
m_fAGCLastFrameAdjusted = TRUE;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
m_iDeadZoneSamples = 0;
|
|
}
|
|
|
|
if (fTransmitFrame)
|
|
{
|
|
// Factor this frame's clipping ratio into the appropriate history bucket
|
|
m_rgfAGCHistory[iVolumeLevel] =
|
|
(m_iClippingSampleCount + (m_rgfAGCHistory[iVolumeLevel] * m_dwHistorySamples))
|
|
/ (m_iClippingSampleCount + m_iNonClippingSampleCount + m_dwHistorySamples);
|
|
|
|
if (m_rgfAGCHistory[iVolumeLevel] > AGC_IDEAL_CLIPPING_RATIO)
|
|
{
|
|
// Only consider lowering the volume if we clipped on this frame.
|
|
if (m_iClippingSampleCount > 0)
|
|
{
|
|
// we're clipping too much at this level, consider reducing
|
|
// the volume.
|
|
if (iVolumeLevel >= AGC_VOLUME_LEVELS - 1)
|
|
{
|
|
// we're already at the lowest volume level that we have
|
|
// a bucket for. Make sure we're clamped to the minimum
|
|
if (lCurVolume > AGC_VOLUME_MINIMUM)
|
|
{
|
|
*plNewVolume = AGC_VOLUME_MINIMUM;
|
|
m_fAGCLastFrameAdjusted = TRUE;
|
|
//DPFX(DPFPREP,DVF_INFOLEVEL, "AGCVA1:AGC,too much clipping, clamping volume to min: %i", *plNewVolume);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// Choose either this volume level, or the next lower
|
|
// one, depending on which has the history that is
|
|
// closest to the ideal.
|
|
float fCurDistanceFromIdeal = (float)(m_rgfAGCHistory[iVolumeLevel] / AGC_IDEAL_CLIPPING_RATIO);
|
|
if (fCurDistanceFromIdeal < 1.0)
|
|
{
|
|
fCurDistanceFromIdeal = (float)(1.0 / fCurDistanceFromIdeal);
|
|
}
|
|
|
|
float fLowerDistanceFromIdeal = (float)(m_rgfAGCHistory[iVolumeLevel+1] / (float)AGC_IDEAL_CLIPPING_RATIO);
|
|
if (fLowerDistanceFromIdeal < 1.0)
|
|
{
|
|
fLowerDistanceFromIdeal = (float)(1.0 / fLowerDistanceFromIdeal);
|
|
}
|
|
|
|
if (fLowerDistanceFromIdeal < fCurDistanceFromIdeal
|
|
&& fCurDistanceFromIdeal > AGC_CHANGE_THRESHOLD)
|
|
{
|
|
// The next lower volume level is closer to the ideal
|
|
// clipping ratio. Take the volume down a tick.
|
|
*plNewVolume = DV_MAX(lCurVolume - AGC_VOLUME_TICKSIZE, AGC_VOLUME_MINIMUM);
|
|
m_fAGCLastFrameAdjusted = TRUE;
|
|
//DPFX(DPFPREP,DVF_INFOLEVEL, "AGCVA1:AGC,too much clipping, setting volume to: %i", *plNewVolume);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// we're clipping too little at this level, consider increasing
|
|
// the volume.
|
|
if (iVolumeLevel == 0)
|
|
{
|
|
// We're already at the highest volume level.
|
|
// Make sure we're at the max
|
|
if (lCurVolume != AGC_VOLUME_MAXIMUM)
|
|
{
|
|
*plNewVolume = AGC_VOLUME_MAXIMUM;
|
|
m_fAGCLastFrameAdjusted = TRUE;
|
|
//DPFX(DPFPREP,DVF_INFOLEVEL, "AGCVA1:AGC,too little clipping, clamping volume to max: %i", *plNewVolume);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// We always increase the volume in this case, and let it push back down if
|
|
// it clips again. This will continue testing the upper volume limit, and
|
|
// help dig us out of "too low" volume holes.
|
|
*plNewVolume = DV_MIN(lCurVolume + AGC_VOLUME_TICKSIZE, AGC_VOLUME_MAXIMUM);
|
|
m_fAGCLastFrameAdjusted = TRUE;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
m_lCurVolume = *plNewVolume;
|
|
|
|
// dump profiling data, in an easily importable format
|
|
DPFX(DPFPREP,DVF_INFOLEVEL, "AGCVA1:AGC,%i,%i,%i,%i,%i,%i,%i",
|
|
m_fVoiceDetectedThisFrame,
|
|
m_fDeadZoneDetected,
|
|
iVolumeLevel,
|
|
(int)(m_rgfAGCHistory[iVolumeLevel]*1000000),
|
|
m_iClippingSampleCount,
|
|
m_iNonClippingSampleCount,
|
|
m_lCurVolume);
|
|
return DV_OK;
|
|
}
|
|
|
|
#undef DPF_MODNAME
|
|
#define DPF_MODNAME "CAGCVA1::VAResults"
|
|
//
|
|
// VAResults - returns the VA results from the previous AnalyzeFrame call
|
|
//
|
|
// pfVoiceDetected - stuffed with TRUE if voice was detected in the data, FALSE otherwise
|
|
//
|
|
HRESULT CAGCVA1::VAResults(BOOL* pfVoiceDetected)
|
|
{
|
|
if (pfVoiceDetected != NULL)
|
|
{
|
|
*pfVoiceDetected = m_fVoiceDetectedThisFrame;
|
|
}
|
|
return DV_OK;
|
|
}
|
|
|
|
#undef DPF_MODNAME
|
|
#define DPF_MODNAME "CAGCVA1::PeakResults"
|
|
//
|
|
// PeakResults - returns the peak sample value from the previous AnalyzeFrame call,
|
|
// normalized to the range 0 to 99
|
|
//
|
|
// pfPeakValue - pointer to a byte where the peak value is written
|
|
//
|
|
HRESULT CAGCVA1::PeakResults(BYTE* pbPeakValue)
|
|
{
|
|
DPFX(DPFPREP,DVF_INFOLEVEL, "AGCVA1: peak value: %i" , m_bPeak);
|
|
*pbPeakValue = m_bPeak;
|
|
return DV_OK;
|
|
}
|
|
|