Pitch shift w/o the delay?

[dslocum]

Is it possible to get a pitch shifter without the delay in the demo software? Or at least minimize the delay significantly?

And a follow-on to that... Is it possible to reduce the slight pulsing effect with or without the delay?

Thanks

Doug

[frank]

Is it possible to get a pitch shifter without the delay in the demo software? Or at least minimize the delay significantly?

You can use a shorter delay length (assuming you are not already using the shortest one) but you will lose shifting of lower frequencies. This is due to the fact we are using a buffer to hold the data and playing it back faster than the data is entering the buffer.

And a follow-on to that... Is it possible to reduce the slight pulsing effect with or without the delay?

Thanks

Doug

The pulsing is due to the pointers having to cross-fade from the beginning of the buffer back around to the end. So how much pulsing you hear is due to the audio content, i.e. frequencies with a wavelength that is an integer multiple of the buffer length will exhibit little pulsing while those that are not will exhibit more pulsing.

[diydsp]

Heya,

I read your post a while back and had a thought...

Since the FV-1 can easily run two pitch scalers at the same time, perhaps you could simultaneously run one with a small buffer and one with a large buffer. That way you'll get a shorter delay on the small buffer. That will make transients sound better. I have never tried this, but it's worth a shot. I believe elsewhere in this forum you can find my code for running two pitch shifters at once.

[frank]

You would be mixing 2 signals with a delay between them, you'll probably get a comb effect. Maybe a moving comb as the pointers on the 2 different delays buffers are always moving the exact delay between the 2 outputs will also always be moving and jumping.