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I used made a fft to make a band pass filter.
After that I made the ifft to inverse it and pass it to time domain.
My ifft has the same length of the fft.
The ifft must be longer or is there a way to make it longer?
How do I pass this ifft to .wav?
The WAV file format is documented pretty well (see below). It’s basically some header information followed by the raw sample data.
first result with Google:
https://ccrma.stanford.edu/courses/422/projects/WaveFormat/