主题:求助,急!!!
这个程序是什么意思啊,帮忙啊,感激不尽
order = input('filter order =200 '); % order of the filter
N = 2^18;
input = wavrecord(N,44100,2);
primary = (input(:,2))'; % primary is from the right channel
reference0 = (input(:,1))'; % reference is from the left channel
DELAY = 56; % 1/340 * 44100 = 130;
reference = zeros(1,N);
reference(DELAY:N) = reference0(1:N-DELAY+1); % make delay on the reference
mu = 0.05;
w=zeros(1,N);
output=zeros(1,N);
for i = order+1:N-1;
output(i) = primary(i) - w(i-order+1:i)*((reference(i-order+1:i))');
w(i-order+2:i+1)=w(i-order+1:i)+mu*reference(i-order+1:i)*output(i); %update all the coefficients each time (LMS)
end;
figure;
subplot(3,1,1);plot(primary); title('primary input'); axis([0 N min(primary)-0.5 max(primary)+0.5]);
subplot(3,1,2);plot(reference0); title('reference noise');
axis([0 N min(primary)-0.5 max(primary)+0.5]);
subplot(3,1,3);plot(output);
title('filtered output'); axis([0 N min(primary)-0.5 max(primary)+0.5]);
wavplay(primary);
wavplay(output)
order = input('filter order =200 '); % order of the filter
N = 2^18;
input = wavrecord(N,44100,2);
primary = (input(:,2))'; % primary is from the right channel
reference0 = (input(:,1))'; % reference is from the left channel
DELAY = 56; % 1/340 * 44100 = 130;
reference = zeros(1,N);
reference(DELAY:N) = reference0(1:N-DELAY+1); % make delay on the reference
mu = 0.05;
w=zeros(1,N);
output=zeros(1,N);
for i = order+1:N-1;
output(i) = primary(i) - w(i-order+1:i)*((reference(i-order+1:i))');
w(i-order+2:i+1)=w(i-order+1:i)+mu*reference(i-order+1:i)*output(i); %update all the coefficients each time (LMS)
end;
figure;
subplot(3,1,1);plot(primary); title('primary input'); axis([0 N min(primary)-0.5 max(primary)+0.5]);
subplot(3,1,2);plot(reference0); title('reference noise');
axis([0 N min(primary)-0.5 max(primary)+0.5]);
subplot(3,1,3);plot(output);
title('filtered output'); axis([0 N min(primary)-0.5 max(primary)+0.5]);
wavplay(primary);
wavplay(output)