lpc.c File Reference

#include "private.h"
#include "add.c"

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Macros
#define	STEP(k)   L_ACF[k] += ((longword)sl * sp[ -(k) ]);
#define	NEXTI   sl = *++sp
#define	STEP(A, B, MAC, MIC)

Functions
void	Autocorrelation (word *s, longword *L_ACF)
void	Reflection_coefficients (longword *L_ACF, register word *r)
void	Transformation_to_Log_Area_Ratios (register word *r)
void	Quantization_and_coding (register word *LAR)
void	Gsm_LPC_Analysis (word *s, word *LARc)

Macro Definition Documentation

NEXTI

#define NEXTI   sl = *++sp

Referenced by Autocorrelation().

STEP [1/2]

#define STEP

(

k

)

L_ACF[k] += ((longword)sl * sp[ -(k) ]);

Referenced by Autocorrelation(), and Quantization_and_coding().

STEP [2/2]

#define STEP	(		A,
			B,
			MAC,
			MIC
	)

Value:

temp = GSM_MULT( A,   *LAR );   \
                temp = GSM_ADD(  temp,   B );   \
                temp = GSM_ADD(  temp, 256 );   \
                temp = SASR(     temp,   9 );   \
                *LAR  =  temp>MAC ? MAC - MIC : (temp<MIC ? 0 : temp - MIC); \
                LAR++;

Function Documentation

Autocorrelation()

void Autocorrelation	(	word *	s,
		longword *	L_ACF
	)

Definition at line 39 of file lpc.c.

References GSM_ABS, GSM_MULT_R, gsm_norm(), k, NEXTI, sl, and STEP.

Referenced by __attribute__(), and Gsm_LPC_Analysis().

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Gsm_LPC_Analysis()

void Gsm_LPC_Analysis	(	word *	s,
		word *	LARc
	)

Definition at line 314 of file lpc.c.

References Autocorrelation(), Quantization_and_coding(), Reflection_coefficients(), and Transformation_to_Log_Area_Ratios().

Referenced by main().

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Quantization_and_coding()

void Quantization_and_coding

(

register word *

LAR

)

Definition at line 277 of file lpc.c.

References STEP.

Referenced by __attribute__(), and Gsm_LPC_Analysis().

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Reflection_coefficients()

void Reflection_coefficients	(	longword *	L_ACF,
		register word *	r
	)

Definition at line 164 of file lpc.c.

References GSM_ABS, GSM_ADD, gsm_div(), GSM_MULT_R, gsm_norm(), P, and SASR.

Referenced by __attribute__(), and Gsm_LPC_Analysis().

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Transformation_to_Log_Area_Ratios()

void Transformation_to_Log_Area_Ratios

(

register word *

r

)

Definition at line 235 of file lpc.c.

References GSM_ABS.

Referenced by __attribute__(), and Gsm_LPC_Analysis().

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