A band-limited resampling UGen.
It uses an internal table for the anti-aliasing filter.
Table resolution is currently fixed at 4096 filter samples per zero crossing and
linear interpolation in the FIR table, but the total filter length can be specified
through the zeroCrossings parameter. Note: If filter parameters are changed, the
table must be recalculated which is very expensive. However, factor modulation
is efficient.
Note: Unlike most other UGens, all parameters but in are read at "output rate".
That is particular important for factor modulation. For each frame output, one
frame from factor is consumed. Currently, modulating rollOff, kaiserBeta or
zeroCrossings is not advised, as this case is not properly handled internally.
- Value Params
- factor
the resampling factor, where values greater than one mean the signal is stretched (sampling-rate increases or pitch lowers) and values less than one mean the signal is condensed (sampling-rate decreases or pitch rises)
- in
the signal to resample
- kaiserBeta
the FIR windowing function's parameter
- minFactor
the minimum expected resampling factor, which controls the amount of buffering needed for the input signal. This is used at initialization time only. The default value of zero makes the UGen settles on the first
factorvalue encountered. It is possible to use a value actually higher than the lowest providedfactor, in order to limit the buffer usage. In that case, the FIR anti-aliasing filter will be truncated.- rollOff
the FIR anti-aliasing roll-off width
- zeroCrossings
the number of zero-crossings in the truncated and windowed sinc FIR.
- Companion
- object