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Korg sampler options

 
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jbeliz
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Joined: 10 Jul 2010
Posts: 139
Location: Washington State

PostPosted: Fri May 29, 2015 6:06 pm    Post subject: Korg sampler options Reply with quote

Can anyone explain a litte more on the meaning of the time stretch, and time slice funtions, what exactly do they do for the sample when editing on korg.
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OpAmp
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Joined: 07 Jun 2013
Posts: 738
Location: Brussels, BE

PostPosted: Fri May 29, 2015 10:43 pm    Post subject: Reply with quote

Hi,

You want it to know exactly? Jump into DSP theory. (Filtering, decimation, upsampling, FFT, ...)

The shorter version is this:

Time stretch will change the length and hence the tempo of the sample while keeping the pitch the same as in the source sample. Playing a sample faster or slower will change the length but will not keep the the pitch. (Remember playing vinyl singles and LP at the wrong speed). So some algorithms come into action. Various approaches are possible. Typically straightforward solutions work very fine for tones with a clear pitch, but gets more difficult for the accents which lack a clear pitch (attacks, percussion like things, ...). Although these days algorithms are very good, some even run in real time.

Time slicing. This is intended for rythm patterns and can be seen as the solution for the problem indicated with the percussion like things. The algorithm detects the different phases of a beat (e.g. bass drum, snare pattern) and chops it up in small pieces each containing one beat. If you now want to change the tempo, the different pieces are just played sooner or later after each other exactly as recorded in the original sample. The pieces themself are not recalculted for holding pitch, because not needed, even not wanted. That is why this method only works fine for rythms (detecting pieces is simple, no need for recalculation).

Both methods can be real time (algorithms are run at the very moment you're playing it) or off-line, meaning, the method is run and generates a new sample that is stored and will be played back as such when selected by a key.

Typically, synth boards do the latter, because you don't have the real time constraint to fullfill and keeps also the available DSP power (max number of voices) predictable when playing the board.

Have fun.
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