?? widebandcancelling.m
字號:
clear all;
clc;
% Wide-band noise cancellation
Fss=8000;
mu = 0.2; % adaptation parameter
M = 11; % filter length
delay = -10; % delay may be + or -
N = 40128;
load gong;y=y';s=y; % signal
noise = 0.2*randn(1,N); % noise
y = s; %+ noise;
h =zeros(M,1); % initial filter coefficients
for n = M+1+delay:N-M, % adaptive algorithm
x = y(n-delay-M+1:n-delay)';
q(n) = h'*x;
e(n) = y(n) - q(n);
h = h + mu * e(n) * x;
end
hold off
plot(y,'g')
hold on
plot(q,'r')
hold on;
plot(e)
p8K = audioplayer(y/max(abs(y)),Fss);
playblocking(p8K);pause(1)
p8K = audioplayer(q/max(abs(q)),Fss);
playblocking(p8K);pause(1)
p8K = audioplayer(e/max(abs(e)),Fss);
playblocking(p8K);
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