直接型fir低通滤波c语言程序,FIR低通滤波器C语言实现.pdf

FIR低通滤波器C语言实现

文文: C:\Documents and Settings\user\桌桌\FirAlgs.c 2009-3-27

27, 15:53:51

/*************************************************************

***************

*

* Name: FirAlgs.c

*

* Synopsis: FIR filter algorithms for use in C

*

* Description:

*

* This module provides functions to implement Finite Impulse

Response (FIR)

* filters using a variety of algorithms.

*

* These functions use most or all of the following input

parameters:

*

* input - the input sample data

* ntaps - the number of taps in the filter

* h[] - the FIR coefficient array

* z[] - the FIR delay line array

* *p_state - the "state" of the filter; initialize this

to 0 before

* the first call

*

* The functions fir_basic, fir_shuffle, and fir_circular are

not very

* efficient in C, and are provided here mainly to illustrate

FIR

* algorithmic concepts. However, the functions fir_split,

fir_double_z

* and fir_double_h are all fairly efficient ways to

implement FIR filters

* in C.

*

* Copyright 2000 by Grant R. Griffin

*

* Thanks go to contributors of comp.dsp for teaching me some

of these

* techniques, and to Jim Thomas for his review and great

suggestions.

*

* The Wide Open License (WOL)

*

* Permission to use, copy, modify, distribute and sell this

software and its

* documentation for any purpose is hereby granted without fee,

provided that

* the above copyright notice and this license appear in all

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文文: C:\Documents and Settings\user\桌桌\FirAlgs.c 2009-3-27

27, 15:53:51

source copies.

* THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT EXPRESS OR IMPLIED

WARRANTY OF

* ANY KIND. See /wol.htm for more

information.

*

**************************************************************

***************/

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