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HW FFT IFFT noise

user4194121
Prodigy 50 points

Hi,

I use the project VC5505 audio filter demo from TI to test the HWFFT and IFFT function

But the output signal is always not clear

My setting in the project

Source(1K) is FROM_CODEC (set in configuration.h)

FFT_LENGTH is 512

All figure below is the output signal from C5505 and i use computer to record it 

1.BypassOn

2. FilterOn

3. Noise( close the music)

although there is just a little different  between BypassOn and FilterOn in visul

but in auditory sense, it is a big influence

Please tell me how to fix it

Thanks a lot,

Tracy

  • 0
    TI__Mastermind 29290 points

    This noise is most likely caused by glitches between each block of audio samples. The software reconstructs blocks of audio with windowing and the Constant-Overlap-and-Add (COLA) method of reconstructing windowed blocks.


    Tweaking the windowing method and COLA parameters should reduce the noise. MATLAB may be required to get it perfect.