odd_order_cascaded_hp.m

声音过滤器工具大集合.

function [b1, a1, b, a] = odd_order_cascaded_HP(fc, fs, N)
%ODD_ORDER_CASCADED_HP - Odd-Order Cascaded IIR Butterworth High-Pass Filter Design Routine.
%                        Designs an Nth-Order high-pass filter by cascading a single first
%                        order section with M second order high-pass sections, where N = 2M + 1.
%
%     usage:  [b1, a1, b, a] = odd_order_cascaded_HP(fc, fs, N)
%   
%          b1 = Two column vector, numerator coefficients of first-order section
%          a1 = Two column vector, denominator coefficients of first-order section
%           b = M x three matrix, numerator coefficients of even-order network
%           a = M x three matrix, denominator coefficients of even-order network
%          fc = Scalar, cutoff frequency (in Hz)
%          fs = Scalar, sampling frequency (in Hz)
%           N = Scalar, filter order (odd)
%           M = Scalar, number of second order sections

%   References:
%      [1]  John Lane, Jayant Datta, Brent Karley, Jay Norwood, "DSP Filters", 
%           PROMPT Publications(an imprint of Sams Technical Publishing), 
%           Indianapolis, IN, 2001, page 339.
%           Book's website: www.dspaudiocookbook.com

%  Copyright (c) 2005 Bo餫