AecLatCal Struct Reference

AecLatCal object measures I/O latency. More...

#include <AecLatCal.h>

List of all members.

Public Attributes
AecLatCalParam	param
	parameters, copied
int	blockIndex
	count blocks
int	numBlocks
	number of calibration blocks
float *	buf
	buffer to hold calibration recording
float *	sig
	cal beep signal, one block in length
int	latency
	detected latency in samples = current delay in far delay buffer
int	isComplete
	T/F cal has completed.

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Detailed Description

AecLatCal object measures I/O latency.

AecLatCal measures the I/O latency by playing a short tone (typically 1 kHz for 20 msec duration) followed by several hundred milliseconds of silence, recording the result, and then analyzing the recording to detect the tone. The tone detection is very simplistic; peak detection after filtering with a second order bandpass filter. Much better would be a matched filter, which works well even if the recording sampling rate differs slightly. This is on the TO DO list.

Only supports monophonic input. If multiple output channels are specified, the tone is played on the left channel.

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

• AecLatCal.h