Home > classes > @miir > mkhighpass.m

mkhighpass

PURPOSE ^

MKHIGHPASS return a high pass filter miir(). A Butterworth filter is used.

SYNOPSIS ^

function f = mkhighpass(f, pl)

DESCRIPTION ^

 MKHIGHPASS return a high pass filter miir(). A Butterworth filter is used.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

 DESCRIPTION: MKHIGHPASS return a high pass filter miir().
              A Butterworth filter is used.

 CALL:        f = mkhighpass(f, pl)

 VERSION: $Id: mkhighpass.m,v 1.4 2008/08/06 15:03:50 ingo Exp $

 HISTORY: 27-08-2002 M Hewitson
             Creation

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 % MKHIGHPASS return a high pass filter miir(). A Butterworth filter is used.
0002 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0003 %
0004 % DESCRIPTION: MKHIGHPASS return a high pass filter miir().
0005 %              A Butterworth filter is used.
0006 %
0007 % CALL:        f = mkhighpass(f, pl)
0008 %
0009 % VERSION: $Id: mkhighpass.m,v 1.4 2008/08/06 15:03:50 ingo Exp $
0010 %
0011 % HISTORY: 27-08-2002 M Hewitson
0012 %             Creation
0013 %
0014 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0015 
0016 function f = mkhighpass(f, pl)
0017 
0018   g     = find(pl, 'gain');
0019   fc    = find(pl, 'fc');
0020   fs    = find(pl, 'fs');
0021   order = find(pl, 'order');
0022 
0023 
0024   if(fc > fs/2)
0025     error('fc must be < fs/2');
0026   end
0027 
0028   % Build filter coefficients
0029   [a, b] = butter(order, 2*fc/fs, 'high');
0030 
0031   % Set filter properties
0032   f.setName('highpass', 'internal');
0033   f.setFs(fs);
0034   f.setA(g.*a);
0035   f.setB(b);
0036   f.setHistin(zeros(1,f.ntaps-1));       % initialise input history
0037   f.setHistout(zeros(1,f.ntaps-1));       % initialise output history
0038 
0039

Generated on Mon 08-Sep-2008 13:18:47 by m2html © 2003