I'm dealing with Speech compression using CELP.

I implemented the code I got from this link https://www.mathworks.com/matlabcentral/fileexchange/39038-celp-codec. There were a few errors but I resolved them. My only problem is that after running the code, it does not play the audio file. I want to watch the original first and then the encoded audio file. What should I do?

Answer 1

[Hassaan]

% Read the original audio file
[originalAudio, fs] = audioread('path_to_your_original_audio_file.wav');

% Play the original audio file
sound(originalAudio, fs);
pause(length(originalAudio)/fs); % Wait for the original to finish

% Assuming you have the CELP encoding and decoding functions
encodedAudio = celp_encode(originalAudio, fs); % This function should encode the audio
decodedAudio = celp_decode(encodedAudio, fs); % This function should decode the audio

% Play the encoded and then decoded audio file
sound(decodedAudio, fs);

% Wait for the decoded to finish, if necessary
% pause(length(decodedAudio)/fs); % Uncomment if needed

% If you do not want to wait for the entire audio to play before moving on with the code,
% you can use the audioplayer function to have more control over playback:
% player = audioplayer(decodedAudio, fs); % Uncomment if needed
% play(player); % This plays the sound asynchronously. Uncomment if needed

Make sure to replace `'path_to_your_original_audio_file.wav'` with the actual path to your audio file. If `celp_encode` and `celp_decode` are not the actual names of the functions used for encoding and decoding in the CELP codec you implemented, replace them with the correct function names.

If the playback doesn't start or you encounter errors, ensure that:

- Your audio device is functioning correctly.

- MATLAB's volume is not muted or too low.

- The encoded and decoded audio data is in the correct format for playback.

Also, be aware that the `sound` function immediately starts playback in MATLAB and will block until it's complete, hence the use of `pause`. The `audioplayer` function, on the other hand, allows for asynchronous playback control.

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[Stephen23]

"Also, be aware that the `sound` function immediately starts playback in MATLAB and will block further MATLAB commands until it's complete"

No, SOUND does not "block" any other MATLAB commands.

[Hassaan]

@Stephen23 Yes you right I mean to say it blocks and once the playback completes then it continues the below statements.

[Mert Sari]

After what you wrote, I solved the problem with my own comment, thank you!

[Stephen23]

"I mean to say it blocks and once the playback completes then it continues the below statements."

That is incorrect.