How can I alter the speed of a wav file without altering its pitch?

Question

Nick 2013-11-18

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/106660-how-can-i-alter-the-speed-of-a-wav-file-without-altering-its-pitch

编辑： Brian Hemmat 2020-4-5

I'm trying to be able to load a wav file, and either speed it up or slow it down. I've tried only changing the sampling frequency, but that changes the pitch of the signal. I find that the problem keeps becoming more and more complex as I go through to problem, so any help at all would be valuable. here's what I've attempted to do so far, but I only get static when I play back the file:

clear
[fName, pName] = uigetfile('*.wav');
[sig, fs, nbits] = wavread([pName fName]);
n = 2;  %speed by which file will be altered
for x = 2:(length(sig)-1);
  newFreq(x) = fs/(2*pi)*acos((sig(x+1)+sig(x-1))/(2*sig(x)));
  newFreq(length(sig)) = 0;
end
Fs = fs*n;
t = 0:1/Fs:(length(newFreq)-1)/Fs;
newSig = cos(2*pi*newFreq.*t);
size(newSig)
newerSig = transpose(newSig);
size(newerSig)
myAP = audioplayer(newSig,Fs);
playblocking(myAP);

3 个评论
显示 1更早的评论隐藏 1更早的评论

Nick 2013-11-18

编辑：Nick 2013-11-18

sorry, I'll try and be more clear. imagine that the file is a song that is the voice of someone singing. I want the song to sound the same, but I want it to be slower. When I only change the sampling frequency, the voice of the singer will get deeper and deeper as the sampling frequency gets lower, and I'm unsure of how to eliminate that effect.

Bilal AKBANA 2020-4-3