How do I save adw modified audio to a wav file

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mark palmer
mark palmer 2024-11-6，6:59
评论： mark palmer 2024-11-6，16:03
How do I savef this modified adw audio to a wav file without having to play it? Audiowrite here doesn't work here to save.
filename = 'speech_dft.mp3';
SpeedFactor = 4/1;
WindowLen = 1024;
OverlapLength = 896;
% Define audio source
reader = dsp.AudioFileReader(filename, ...
'SamplesPerFrame',(WindowLen - OverlapLength));
adw = audioDeviceWriter('SampleRate',reader.SampleRate);
% Define time scale modification object
ats = audioTimeScaler('Window',sqrt(hann(WindowLen,'periodic')), ...
'OverlapLength',OverlapLength, ...
'SpeedupFactor', SpeedFactor);
while ~isDone(reader) % THIS PLAYS THE MODIFIED RESULTS
x = reader();
y = ats(x); % AUDIO TIME SCALER
adw(y); % AUDIO DEVICE WRITER
end
% THIS SAVES THE MODIFIED RESULTS
audiowrite('output_file.wav', y, 44100, 'BitsPerSample', 16);
% THIS SAVES the object to a file
% save('adw.mat', 'adw');
release(reader);
release(adw);

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回答（2 个）

Walter Roberson
Walter Roberson 2024-11-6，7:09
Use dsp.AudioFileWriter
Note: in your current code, the y that you audiowrite() would represent only the last buffer-full of data, and not the entire transformed data.
Sameer
Sameer 2024-11-6，7:17
Hi @mark palmer
To save the modified audio to a WAV file without playing it, you can use a buffer to collect the processed audio data and then write it to a file using "audiowrite".
Here's how you can modify your code:
filename = 'speech_dft.mp3';
SpeedFactor = 4/1;
WindowLen = 1024;
OverlapLength = 896;
% Define audio source
reader = dsp.AudioFileReader(filename, ...
'SamplesPerFrame', (WindowLen - OverlapLength));
% Define time scale modification object
ats = audioTimeScaler('Window', sqrt(hann(WindowLen, 'periodic')), ...
'OverlapLength', OverlapLength, ...
'SpeedupFactor', SpeedFactor);
% Initialize a buffer to store the modified audio
buffer = [];
while ~isDone(reader)
x = reader();
y = ats(x); % AUDIO TIME SCALER
buffer = [buffer; y]; % Append the processed audio to the buffer
end
% Save the entire buffer as a WAV file
audiowrite('output_file.wav', buffer, reader.SampleRate, 'BitsPerSample', 16);
release(reader);
Hope this helps!

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