Only thing that I want to control is speed. not pitch.

[Q, S] = audioread("sample.mp3");

speed = 1.2;

S = S * speed;

soundsc(Q,S);

This is what I do.

as you know, this code makes increase both pitch and speed.

but I want to make change only speed.

How can I control it?

**and How can I only control pitch?

Answer 1

[Jan]

Start with searching in the net, especially in this forum:

• https://www.mathworks.com/matlabcentral/answers/106660-how-can-i-alter-the-speed-of-a-wav-file-without-altering-its-pitch
• https://dsp.stackexchange.com/questions/45794/how-to-change-speed-of-audio-samples-without-changing-pitch
• https://dsp.stackexchange.com/questions/31850/slow-down-music-playing-while-maintaining-frequency

The problem is complex.

[Daeil Jung]

Thx. :)

Finally I got some idea. But... you're right.

This is quiet hard for me to perfectly understand.

[michael antonios]

pls how can i change pitch without changing speed ???

[Jan]

@michael: Did you read my answer?

Answer 2

[Bilal AKBANA]

THIS IS THE CLEAR ANSWER I THINK COVERING BOTH VOLUME AND SPEED OF THE SOUND WITH CONDITION THAT YOU HAVE stretchAudio FUNCTION RELEASED AS OF R2019b. THIS ALGORITM CAN CHANGE THE SPEED AND VOLUME OF THE AUDIO WITHOUT MAKING IT SOUND FUNNY.

[y, fs] = audioread("sample.mp3"); % read audio file.
speed = 1.2; % increase speed of sound 1.2 times than the given speed.
volume = 2; % increase volume of sound 2 times than the given volume.
y = stretchAudio(volume*y,speed);
sound(y,fs); % my recommendation is to use sound instead of soundsc
% clear sound; % to stop sound
% OR INSTEAD OF sound you can use
player = audioplayer(y,fs);
% play(player); % comment this out it will play.
% stop(player); % comment this out it will stop.

[adnan abid]

great work man thank you much your code helped a lot

Answer 3

[Brian Hemmat]

Starting in R2019b, Audio Toolbox provides functions to shift pitch and time-stretch audio: shiftPitch, stretchAudio.

[Brian Kardon]

Those links appear to be invalid

[Brian Hemmat]

sorry about that--fixed links