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Hi everybody,
I'd like to build my own "whammy" pedal or anything witch can "double" the signal frequency.
There is the idea:
- Sample guitar signal with the best quality you can (~DVD-audio : 24 bits 192kHz or better)
- Compute signal FFT (obtaining FFT1)
- Compute signal power P1 of FFT1
- Search fundamental in FFT (Fo)
- Remove all frequencies between Fo and 2*Fo (obtaining FFT2)
- Compute signal power of FFT2 (P2)
- boost FFT2 by P1/P2
- Compute inverse FFT
- DAC it !
I don't know if it could works, and what effect we could obtain.
But I have a useless, home-made Cyclone II / 16-bits 500kHz ADC-DAC , and I'm going to use it...
I'd like to build my own "whammy" pedal or anything witch can "double" the signal frequency.
There is the idea:
- Sample guitar signal with the best quality you can (~DVD-audio : 24 bits 192kHz or better)
- Compute signal FFT (obtaining FFT1)
- Compute signal power P1 of FFT1
- Search fundamental in FFT (Fo)
- Remove all frequencies between Fo and 2*Fo (obtaining FFT2)
- Compute signal power of FFT2 (P2)
- boost FFT2 by P1/P2
- Compute inverse FFT
- DAC it !
I don't know if it could works, and what effect we could obtain.
But I have a useless, home-made Cyclone II / 16-bits 500kHz ADC-DAC , and I'm going to use it...