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Re: Audio FFT Filter, noisy clicks

Reply posted 6 years ago (10/18/2017)
Thanks.Put it down to program laziness. fftw requires arrays to be "prepared" so that the FFTs are optimised for the machine being used. In haste, I used only one...

Re: Audio FFT Filter, noisy clicks

Reply posted 6 years ago (10/17/2017)
Sorted.The double FFT operation was returning the input array "time reversed" I tried printing the output of a 64 point FFT-IFFT as you suggested, and it showed...

Re: Audio FFT Filter, noisy clicks

Reply posted 6 years ago (10/17/2017)
Thanks. This was just an experiment as the original code uses a FIR filter which works quite happily using the same sized blocks. The original uses the standard...

Re: Audio FFT Filter, noisy clicks

Reply posted 6 years ago (10/17/2017)
>You probably have a bug in your code.I am sure that's the problem :-)  

Re: Audio FFT Filter, noisy clicks

Reply posted 6 years ago (10/17/2017)
Yes, quite. My maths says that a forward FFT followed by an inverse FFT should produce the same array (apart from crud, and normalisation) as the two matrix multiplications...

Audio FFT Filter, noisy clicks

New thread started 6 years ago
Well, not a filter exactly, just an FFT in-out test.  I got a simple test program in a loop (using fftw) * Read 2048 samples of audio at 48000 (16 bits stereo,...

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