+
−% MKBANDPASS return a bandpass filter miir(). A Cheby filter is used.
+
−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
−%
+
−% DESCRIPTION: MKBANDPASS return a bandpass filter miir().
+
−%              A Cheby filter is used.
+
−%
+
−% CALL:        f = mkbandpass(f, pl)
+
−%
+
−% VERSION: $Id: mkbandpass.m,v 1.11 2011/04/04 11:37:02 hewitson Exp $
+
−%
+
−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
−
+
−function f = mkbandpass(f, pl)
+
−  
+
−  g      = find(pl, 'gain');
+
−  fc     = find(pl, 'fc');
+
−  fs     = find(pl, 'fs');
+
−  order  = find(pl, 'order');
+
−  ripple = find(pl, 'ripple');
+
−  
+
−  utils.helper.checkFilterOptions(pl);
+
−  
+
−  % Build filter coefficients
+
−  [a, b] = cheby1(order, ripple, 2.*fc./fs);
+
−  
+
−  % Set filter properties
+
−  f.name    = 'bandpass';
+
−  f.fs      = fs;
+
−  f.a       = g.*a;
+
−  f.b       = b;
+
−  f.histin  = zeros(1,f.ntaps-1); % initialise input history
+
−  f.histout = zeros(1,f.ntaps-1); % initialise output history
+
−end
+
−