www.pudn.com > CryptoPhone-src-031122.zip > makefilt.c

/* Copyright 2001,2002,2003 NAH6 
 * All Rights Reserved 
 * 
 * Parts Copyright DoD, Parts Copyright Starium 
 * 
 */ 
/************************************************************************** 
* 
* ROUTINE 
*		makefilt 
*		makefilt_dynamic 
* 
* FUNCTION 
*		defines and returns a filter structure 
*		makefilt makes a filter with static coefficients 
*		makefilt_dynamic makes a filter with changing coefficients 
* 
* SYNOPSIS 
*		function makefilt(coef, f_order, data_length) 
*		function makefilt_dynamic(f_order, data_length) 
* 
*   formal  
* 
*                       data    I/O 
*       name            type    type    function 
*       ------------------------------------------------------------------- 
*	coef		float	i	order+1 filter coefficients 
*	f_order		int	i	Filter order  
*	data_length	int	i	Number of samples to filter 
* 
*	flt		FILTER	o	returned FILTER structure 
* 
*************************************************************************** 
* 
* CALLED BY 
* 
*	 
* 
* CALLS 
*	filter.h 
* 
***************************************************************************/ 
 
#include "celpfilt.h" 
 
FILTER makefilt( 
float 	coef[], 
int 	f_order,  
int	data_length) 
{ 
	int i; 
	FILTER flt; 
	flt.order=f_order; 
	flt.data_length=data_length; 
	for (i=0; i<=f_order; i++) 
	{ 
		flt.coef[i]=coef[i]; 
		flt.memory[i]=0.0; 
	} 
	return flt; 
} 
 
FILTER makefilt_dynamic( 
int 	f_order,  
int	data_length) 
{ 
	int i; 
	FILTER flt; 
	flt.order=f_order; 
	flt.data_length=data_length; 
	for (i=0; i<=f_order; i++) 
	{ 
		flt.memory[i]=0.0; 
	} 
	return flt; 
}