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Algorithms and Parameters
Lexicon
VSO-CHMB
The VSO-Chmb algorithm provides the same high quality shifter as
Stereo-Chmb, designed for on the fly pitch correction of varispeed
playback sources. A varispeed parameter allows you to match the
varispeed setting of the playback source. The algorithm can match
speeds ranging from +55.00% through –35.48% with a resolution
of .01%.
This algorithm is a utility program designed to provide pitch
correction of varispeed material. This is a true stereo algorithm
which maintains the stereo image of source material. It can be used
in applications that require on the fly compression/expansion.
Simply match the value of the Varispeed parameter to the
varispeed setting of the playback source.
For example, to compress a 30 second spot to 24 seconds, the
playback speed must be increased by 20%. The spot now has the
correct run length, but increasing the speed created an upward
pitch shift of 386 cents. Run the shifted audio through the
VSO-Chmb algorithm. Set the Varispeed parameter to +20%. This
shifts the pitch down 386 cents. The spot now has a run length of
24 seconds and is at its original pitch.
To expand a 28 second spot to 30 seconds, the playback speed
must be decreased by 7.14%. Set both the playback source and the
VSO Shifter to –7.14%. The spot will remain at its original pitch and
have a run length of 30 seconds.
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