I am doing dtmfe i need a time delay between each of the 8 numbers, the figure i get is without delay, i need it to be like the second picture

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Mohamed Mahir
Mohamed Mahir 2021-4-11
y = [];
for i = 1:8
[y1 Fs] = audioread(strcat('Key',int2str(i),'.wav'));
y = [y; y1];
end
%I need to delay this by 50ms
T1 = Ts*(0:8000-1)';
plot(T1,y)

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