Aes Struct Reference

Aes (acoustic echo suppression) runtime structure. More...

#include <aes.h>

List of all members.

Public Attributes
AesParam	param
	parameters
float	blockTime
	block time, sec
int	nearTalk
	T = pass near, F = pass far.
int	nearTalkHoldBlocks
	number blocks to hold
int	nearTalkHold
	count of blocks since last activity
float	refEnvGain
	reference (far) envelope gain
float	refEnv
	reference envelope value, ms
float	echoGain
	current avg estimate of echo gain (gms_avg), linear
float *	xin
	x input buffer after delaying to compensate
float *	xDelay
	delay buffer for far signal for latency compensation
int	xIndex
	circular index into delay buffer, 0...latency-1
int	maxLatency
	max latency in samples = allocated length of far delay buffer
Dre *	nearDre
	near side dynamic range estimator
Dre *	farDre
	far side dynamic range estimator
Avg *	nearAvg
	near energy avg for echo gain est
Avg *	farAvg
	far energy avg for echo gain est
int	latency
	detected latency in samples = current delay in far delay buffer
int	trainNearOnEcho
	T = train near DRE on echo, F = just detected neartalk.
int	blockIndex
	counts blocks for log messages
EqState	hpfZ [2]
	AC-coupling filter state.
Eq2Coeff	hpfCoeff
	AC-coupling filter coefficients.
int	dumpMatlabData
	T/F dump matlab data.
FILE *	matFp
	matlab data dump file, or NULL

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Detailed Description

Aes (acoustic echo suppression) runtime structure.

The Acoustic Echo Suppressor is a relatively simple algorithm that allows only single duplex communication, muting the microphone signal when the far side is talking, and muting the far side when the near side is talking. The AES estimates the echo gain and the dynamic range of the far and near signals, and from these estimates and the current signal levels of the far and near side, determines which sides are actively speaking, and which to pass.

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The documentation for this struct was generated from the following file:

• aes.h