24 Mar
2004
24 Mar
'04
4:02 p.m.
Tim Goetze wrote on Tue, 23-Mar-2004:
pleased to announce the new DSP package
'pvoc'. at its core, it
features the CARL phase vocoder.
there are three LADSPA units in this package (Exaggerate, Transpose,
Accumulate) plus a commandline utility for time compression and
expansion of n-channel audio data streams.
compilation of this package will probably be an even rougher ride than
with the initial release of caps (pvoc depends on FFTW3 and sndfile)
but i'll be happy to help should you run into problems.
The stretch program was not properly clamping the output from
-1.0 -> 1.0 yielding to terrible cracks upon writing as 16bit
wave files when the output is clipped. The fact that non-clipping
(but very close to) input yielded clipping output is another issue,
but not crucial.
I've attached a patch that fixes the problem.
Other than that, this sounds pretty darn good compared to soundtouch
(a time domain algorithm) at more extreme stretch factors.
jlc