dtmfscore.m

来自「很多matlab的源代码」· M 代码 · 共 20 行

function  sc = dtmfscore(xx, hh)
%DTMFSCORE
%          sc = dtmfscore(xx, hh)
%    returns a score based on the maximum amplitude of the filtered output
%     xx = input DTMF signal
%     hh = impulse response of ONE bandpass filter
%
%   The signal detection is done by filtering xx with a length-L
%   BPF, hh, and then finding the maximum amplitude of the output.
%   The score is either 1 or 0.
%      sc = 1 if max(|y[n]|) is greater than, or equal to, 0.95
%      sc = 0 if max(|y[n]|) is less than 0.95
%

xx = xx*(2/max(abs(xx)));   %---Scale x[n] to the range [-2,+2]
y=conv(xx,hh);
if max(y)>0.95 sc=1;
else sc=0;
end