search for: fft160

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2008 May 29
2
FFT Resampler
...e-05 9.20e-01 9.71e-01 Filt Q4: 1.96e-05 Filt Q5: 9.61e-06 FFT+0: 3.83e-02 1.91e-01 7.06e-01 (And you can clearly hear this) FFT+16: 8.10e-03 6.18e-02 6.60e-01 (violates the resampler requirements and shifts frequencies slightly) FFT+160: 1.14e-05 3.75e-03 6.39e-01 (shortest allowed overlap) So, FFT160 is somewhere between Q4 and Q5. And it's 6 times faster than Q4. Testing with twice the block and overlap length: FFT 640/320: 1.13e-05 3.49e-03 6.38e-01 erm. Hm. Need more testing on that one, I think. Moving to 16=>48, let's examine different block and overlap lengths: 160+16: 1.20e-0...
2008 May 29
2
FFT Resampler
>> Yes, I plan to use it in a VoIP environment if I can get latency reduced to >> an acceptable level :) >> The latency depends directly on the overlap parameter, which also controls >> the quality. Higher quality => higher latency. You could set the overlap to >> 0, but that would give you some nasty artifacts. >> You can also resample with smaller block