logs3.h File Reference

s3 log table implementation. More...

#include <s3types.h>
#include <logmath.h>

Go to the source code of this file.

Defines
#define	LOGS3_SUCCESS   1
#define	LOGS3_FAILURE   0
Functions
S3DECODER_EXPORT logmath_t *	logs3_init (float64 base, int32 bReport, int32 bLogTable)
S3DECODER_EXPORT int32	logs3 (logmath_t *logmath, float64 p)
void	logs3_report (logmath_t *logmath)

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Detailed Description

s3 log table implementation.

In evaluating HMM models, probability values are often kept in log domain, to avoid overflow. Furthermore, to enable these logprob values to be held in int32 variables without significant loss of precision, a logbase of (1+epsilon), epsilon<<1, is used. This module maintains this logbase, and other functions to support it.

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Define Documentation

#define LOGS3_FAILURE   0

#define LOGS3_SUCCESS   1

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Function Documentation

S3DECODER_EXPORT int32 logs3 (  logmath_t *  logmath, float64  p )

Given p, return logs3(p) Parameters: p  The first number in float

S3DECODER_EXPORT logmath_t* logs3_init (  float64  base, int32  bReport, int32  bLogTable )

Initialize module with a new base (> 1.0). Returns 0 if successful, -1 otherwise. Parameters: base  The log base of the module bReport  Whether progress should be reported bLogTable  Whether log table should be used or not

void logs3_report (  logmath_t *  logmath  )

Report the parameters for s3 log table

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