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s5000 / s6000
TIMESTRETCH
Timestretch allows you to alter the length of a sample, shortening it or lengthening it, without
changing its pitch. Before we look at how to operate the timestretch functions on the S6000, let us
first look briefly at how timestretch works.
Timestretch works by instructing the digital signal processor to analyse the signal and insert or
delete blocks of sample data at appropriate places and crossfades are used to make the insertions
and deletions as seamless as possible. This has the effect of lengthening or shortening a recording.
As you can see from the following diagram, blocks of sample data have been inserted to create a
200% timestretch. The overall envelope of the sound data is preserved but there is twice as much
data in it causing it to play back twice as slow.
In the following diagram, data has been removed to make the recording play back faster.
ORIGINAL RECORDING
70% TIMESTRETCH
Unfortunately, however, perfect results using timestretch are sometimes difficult to achieve. It is
not a limitation of software or hardware but due to the fact that, although the processor is clever, it
is not that clever and can sometimes make mistakes in deciding which sample to insert or remove.
The end result of this is that, on occasions, especially with stretch factors exceeding 10% or so,
you may get an echo or 'flam' effect on some transients because the processor has inserted a
transient. When shrinking a recording, you may find a transient softened because the processor
has decided to remove it. You will find this to be the case more or less on all devices that feature
some form of time compression or expansion.
Version 1.21
SAMPLE DATA BLOCKS
ORIGINAL RECORDING
WITH 200% TIMESTRETCH
EDIT SAMPLE
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