[LAD] Hi, I'm new
tim at quitte.de
Wed Sep 9 08:41:47 UTC 2015
> Would the approach to use a sample-rate converter to essentially interpolate
> samples, then do the processing, and then sample back down?
The principle is indeed the same, and you could use a converter
library for this purpose. However, those converters are designed to
work over a continuous range of samplerate ratios whereas the ratio
chosen for oversampling is usually a fixed integer because this
presents ample opportunity for optimisation. The interpolation
filters in both cases are usually windowed sinc FIR (much like the
Lanczos kernel in image resampling).
> How does that work for live streams of data?
As you intuit: you sample up, process, then sample back down, ending
up with one output sample for every input sample.
IIrc, http://quitte.de/dsp/caps.html contains at least two oversampled
plugins and comes with source code.
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