Quote:
Originally Posted by Froombosch  Maybe already been discussed:
Is the phaseresponse considered more important then the amplitude response within high order interpolators? |
Not for reverbs, IMO. Reverbs scramble phase anyway, so the phase response is not that important. The things I consider important are the amplitude response, and the SNR when the delay length changes by more than 1 sample:
- Linear interpolation has poor amplitude response versus frequency, but a nice SNR with wide modulation widths.
- Higher order FIR interpolation schemes have better amplitude responses, but the cost goes up with the order.
- Some allpass interpolation schemes can be very noisy when the modulation width is fairly high, so you have to be careful. This is due to the allpass coefficient getting too close to the unit circle, which results in a transient that takes a while to ring out.
- Using no interpolation results in a perfectly flat amplitude response, but crappy SNR.
- If your modulation is updated at a slower rate, this increases the SNR as well.