makefilt.c

手机加密通话软件

/* 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;
}