ss.c File Reference

Spectral subtraction. More...

#include <sent/stddefs.h>
#include <sent/mfcc.h>

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Functions
static boolean	myread (void *buf, size_t unitbyte, int unitnum, FILE *fp)
float *	new_SS_load_from_file (char *filename, int *slen)
float *	new_SS_calculate (SP16 *wave, int wavelen, Value para, int *slen)

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Detailed Description

Spectral subtraction.

Author:

Akinobu LEE

Date:

Thu Feb 17 17:19:54 2005

The actual subtraction will be performed in wav2mfcc-buffer.c and wav2mfcc-pipe.c. These functions are for estimating average spectrum of audio input, and file I/O for that.

Revision

1.1.1.1

Definition in file ss.c.

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Function Documentation

static boolean myread (  void *  buf, size_t  unitbyte, int  unitnum, FILE *  fp )  [static]

Binary read function with byte swaping (assume file is BIG ENDIAN) Parameters: buf  [out] read data unitbyte  [in] size of a unit in bytes unitnum  [in] number of unit to be read fp  [in] file pointer Definition at line 44 of file ss.c.

float* new_SS_load_from_file (  char *  filename, int *  slen )

Load a noise spectrum from file. Parameters: filename  [in] path name of noise spectrum file slen  [out] length of the returned buffer Returns: a newly allocated buffer that holds the loaded noise spectrum. Definition at line 65 of file ss.c. Referenced by new_wav2mfcc(), and RealTimeInit().

float* new_SS_calculate (  SP16 *  wave, int  wavelen, Value  para, int *  slen )

Compute average spectrum of audio input. This is used to estimate a noise spectrum from input samples. Parameters: wave  [in] input audio data sequence wavelen  [in] length of above para  [in] parameter slen  [out] length of returned buffer Returns: a newly allocated buffer that contains the calculated spectrum. Definition at line 109 of file ss.c. Referenced by new_wav2mfcc().

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