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Ported a patch from the old repository, which improve the suppression on Android, where high gains have been seen in the upper frequency band.

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Review URL: http://webrtc-codereview.appspot.com/68005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@204 4adac7df-926f-26a2-2b94-8c16560cd09d
This commit is contained in:
bjornv@google.com 2011-07-14 07:01:55 +00:00
parent a769fa51c0
commit 298e54a715
1 changed files with 31 additions and 3 deletions
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34
src/modules/audio_processing/aecm/main/source/aecm_core.c
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@ -9,15 +9,13 @@
*/
#include <stdlib.h>
#include <assert.h>
#include "aecm_core.h"
#include "ring_buffer.h"
#include "echo_control_mobile.h"
#include "typedefs.h"
// TODO(bjornv): Will be removed in final version.
//#include <stdio.h>
#ifdef ARM_WINM_LOG
#include <stdio.h>
#include <windows.h>
@ -1570,6 +1568,10 @@ void WebRtcAecm_ProcessBlock(AecmCore_t * const aecm, const WebRtc_Word16 * cons
WebRtc_Word16 zerosDBufNoisy, zerosDBufClean, zerosXBuf;
WebRtc_Word16 resolutionDiff, qDomainDiff;
const int kMinPrefBand = 4;
const int kMaxPrefBand = 24;
WebRtc_Word32 avgHnl32 = 0;
#ifdef ARM_WINM_LOG_
DWORD temp;
static int flag0 = 0;
@ -2202,6 +2204,32 @@ void WebRtcAecm_ProcessBlock(AecmCore_t * const aecm, const WebRtc_Word16 * cons
numPosCoef++;
}
}
// Only in wideband. Prevent the gain in upper band from being larger than
// in lower band.
if (aecm->mult == 2)
{
// TODO(bjornv): Investigate if the scaling of hnl[i] below can cause
// speech distortion in double-talk.
for (i = 0; i < PART_LEN1; i++)
{
hnl[i] = (WebRtc_Word16)WEBRTC_SPL_MUL_16_16_RSFT(hnl[i], hnl[i], 14);
}
for (i = kMinPrefBand; i <= kMaxPrefBand; i++)
{
avgHnl32 += (WebRtc_Word32)hnl[i];
}
assert(kMaxPrefBand - kMinPrefBand + 1 > 0);
avgHnl32 /= (kMaxPrefBand - kMinPrefBand + 1);
for (i = kMaxPrefBand; i < PART_LEN1; i++)
{
if (hnl[i] > (WebRtc_Word16)avgHnl32)
{
hnl[i] = (WebRtc_Word16)avgHnl32;
}
}
}
#ifdef ARM_WINM_LOG_
// measure tick end