AecCal.h File Reference

AEC calibration functions. More...

Go to the source code of this file.

Classes
struct	AecSyncParam
	Synchronization parameters. More...
struct	CalParam
	Calibration parameters. More...
struct	CalResults
	Calibration results. More...
Enumerations
enum	AecSyncMethod { SYNC_METHOD_NONE = 0, SYNC_METHOD_UPSAMPLE, SYNC_METHOD_RESAMPLE }
	synchronization methods More...
enum	AecCalErr {   CAL_OK = 0, CAL_NO_SIGNAL, CAL_DROPOUT, CAL_DEVICE,   CAL_CLOCK, CAL_ERROR }
	calibration errors More...
Functions
void	CalGetDefaultParam (CalParam *p)
	Fill parameter structure with defaults.
void	CalGenSin (float *buf, int n, float fs, float f0, float phi, float amp)
	Generate a sine tone.
float *	CalGenSignal (CalParam *param, int *p_n)
	Generate test signal.
AecCalErr	CalAnalyzeRec (float *buf, int n, CalParam *p, CalResults *r)
	Analyze recording and create CalResults.

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Detailed Description

AEC calibration functions.

Calibration functions to determine sampling rate offset.

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Enumeration Type Documentation

enum AecCalErr

calibration errors

Enumerator:

CAL_OK	OK.
CAL_NO_SIGNAL	signal level too low
CAL_DROPOUT	signal appears to have dropouts, repeat increasing buffering
CAL_DEVICE	can't open device
CAL_CLOCK	too much clock deviation, repeat measurement
CAL_ERROR	other error, perhaps there's too much noise?

enum AecSyncMethod

synchronization methods

Enumerator:

SYNC_METHOD_NONE	no synchronization
SYNC_METHOD_UPSAMPLE	upsample device to high rate
SYNC_METHOD_RESAMPLE	resample device input according to ratio

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Function Documentation

float* CalGenSignal	(	CalParam *	param,
		int *	p_n
	)

Generate test signal.

Generate test signal.

This starts with some optional leading silence for noise floor estimation, and then a sine tone for sample rate offset estimation, and then some optional post silence to allow tone to fully record.