[linux-audio-user] stretching sound

Eric Dantan Rzewnicki rzewnickie at rfa.org
Tue Dec 9 12:21:53 EST 2003

I think the pitch shift works by either compressing or stretching the

Pitch shifter. Modifies audio pitch by altering its length.

which i think means that -ei:50, for instance, will make the file play
twice as long while sounding at half pitch and -ei:200 will make
the file play half as long while sounding at twice the pitch.

I did some simple tests on this at home the other night. A pitch shift 
of less than 100% is equivalent to time stretching while a pitch shift
of greater than 100% is the same as time compressing.

-Eric Rz.

On Tue, Dec 09, 2003 at 03:04:34PM +0100, derek holzer wrote:
> Julien,
> Julien Claassen wrote:
> >  Ecasound's pitch-shift can work in realtime. Only you'd need a file as
> >input, not a device.
> Have you found a way to use ecasound's pitch-shift to stretch a sound at 
> all? If so, could you post the command line you are using please?
> 'man ecasound' and 'ecasound --help' didn't mention anything about 
> time-stretch, only pitch-shift.
> Be curious to know.
> Best,
> D.
> -- 
> derek holzer ::: http://www.umatic.nl
> ---Oblique Strategy # 30:
> "Change specifics to ambiguities"

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