conv_coeff.m

声音过滤器工具大集合.

function [B, A] = conv_coeff(b, a)
%CONV_COEFF - Converts(negates) the signs of all but first 
%             denominator coefficients of a given digital filter. 
%
%    usage:   [B, A] = conv_coeff(b, a)
%     
%             b = M+1 column vector, input  numerator coefficients
%             a = M+1 column vector, input  denominator coefficients
%             B = M+1 column vector, output numerator coefficients
%             A = M+1 column vector, output denominator coefficients
%             M = Scalar, order of the filter   
%
 
%  Copyright (c) 2005 Bo餫