TIme shifting an audio in a frequency domain

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chung kuan ren
chung kuan ren 2019-10-7
评论： Yvonne Haesevoets 2023-6-13
Hi guys, newbie here. Needed to help on this, not sure if it is possible to acheive.
I am trying to do a time shift in freq domain on one of the audio so this part of the code i did so far. reading an audio can put into window frame form.
[data,fs] = audioread('audio.wav');
no_frame = 10;
datalength = length(data);
framesize = floor(datalength/no_frame);
temp = 0
for i = 1 : no_frame
frames(i,:) = data(temp + 1 : temp + framesize);
temp = temp + framesize;
end
tried doing this line but seem to have problem:
y(i,:) = yp(i,:).*exp(-j*2*pi*f*(1/fs));
Appreatiate any suggestion. Thank you.

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回答（1 个）

Prabhan Purwar
Prabhan Purwar 2019-11-18
Hey,
The following code illustrates the Time-shifting of a signal in the frequency domain.
[data,fs] = audioread('FemaleSpeech-16-8-mono-3secs.wav');
no_frame = 10;
datalength = length(data);
N = floor(datalength/no_frame); %Framesize
temp = 0;
for i = 1 : no_frame
frames(i,:) = data(temp + 1 : temp + N);
temp = temp + N;
end
i=1; %for 1st frame
t=400;
yi=frames(i,:);
yp(i,:)=fft(yi);
y(i,:) = exp(-1i*2*pi/N*(0:N-1)*t).*yp(i,:);
rslt(i,:)=ifft(y(i,:),'symmetric');
plot(yi);
figure
plot(rslt(i,:));
Output:Capture.JPG
Refer to the following links for further information:
  1 个评论
Yvonne Haesevoets
Yvonne Haesevoets 2023-6-13
I tried applying --like you did-- this property of the DTFT to operate a shift in time by a non-integer number of samples, but I was missing one element : 'symmetric'. It makes perfect sense.
It works like a charm now --thank you !

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