linuxaudio.org

On 02/24/2012 05:52 PM, Harry van Haaren wrote:

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> On Fri, Feb 24, 2012 at 10:12 AM, Joan Quintana wrote:

>

>> This is more interesting and not simple like the previous. A part of

>> playing back the file, it permits frequency shifting and frequency sweeping

>> in a range between .5 and 2.

>

>

> I presume by "frequency shifting & frequency sweeping" you mean resampling

> the signal & playing it back, not true "pitch shift" with time remaining

> constant..?

Jplay-sndfile-1.0.0 does zero-order hold. No up/downsampling, no

interpolation.
It'd actually be easier to just use librubberband for frequency shifting

and time-stretching.
> I'd like to see a simple example of eg: phase vocoder doing variable rate

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> pitch shifting / time stretching...

_simple_? well maybe example code that comes with

http://breakfastquay.com/rubberband/
http://www.teuton.org/~gabriel/stretchplayer/ (C++) uses librubberband.

Samplecat's jack_player.c (C) uses LADSPA rubberband and libsamplerate.
The code is not complicated; but probably does not qualify as simple.
> Perhaps you've just provided that...? :) -Harry

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>

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