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clear all;
close all;

[sound, Fs] = wavread('sound.wav');
plot(sound);
time=1;
amp = 3;
D = time * Fs; 
sound_ = zeros((length(sound)+D),1);
for i=1:length(sound)
    sound_(i) = sound(i);
    if i>D
        sound_(i) = sound_(i)+ a*sound(i-D);
    end
end
for i=length(sound)+1:length(y)
    sound_(i) = a*sound(i-D);
end
wavwrite(sound_,'result_echo');
figure;
plot(sound_);

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