Re: [LAD] Let's kill EPAMP???

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To: Stefano D'Angelo <zanga.mail@...>
Cc: <linux-audio-dev@...>
Date: Thursday, June 5, 2008 - 7:35 pm

On Wed, 2008-06-04 at 11:46 +0200, Stefano D'Angelo wrote:

> For example, I'm not sure whether not having that feature prevents or

To do a scratching effect, you actually need a resampler and then play
the resampled data back at the original samplerate. When scratching,
both the pitch and the speed of the sound goes up and down depending on
the speed of the disc.

To do that with digital audio you must either change the sample rate of
the data or the interface. Because you can't continuously change the
sample rate of a pc sound interface, you must resample the data.

The pitch or and speed matching stuff dj's do is exactly the same. They
can just match either one (unless they're really lucky) because both
change when the one parameter (the speed of the disc).

Rubberband ( http://breakfastquay.com/rubberband/ ) contains a plugin
(ladspa) that can change only the pitch of an audio stream.

All of these effects have a strict 1:1 ratio between samples going in
and going out. The only effect which differs in this would be changing
the 'length' of the signal, but that is a different story altogether.

I hope I got your original question right. If I didn't, sorry for the
noise everyone :)

Sampo

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Messages in current thread:
[LAD] Let's kill EPAMP???, Stefano D'Angelo, (Mon Jun 2, 3:35 pm)
Re: [LAD] Let's kill EPAMP???, Stefano D'Angelo, (Tue Jun 3, 6:40 pm)
Re: [LAD] Let's kill EPAMP???, Steve Harris, (Wed Jun 4, 9:15 am)
Re: [LAD] Let's kill EPAMP???, Stefano D'Angelo, (Wed Jun 4, 9:46 am)
Re: [LAD] Let's kill EPAMP???, Sampo Savolainen, (Thu Jun 5, 7:35 pm)
Re: [LAD] Let's kill EPAMP???, Sampo Savolainen, (Thu Jun 5, 7:43 pm)
Re: [LAD] Let's kill EPAMP???, Lars Luthman, (Wed Jun 4, 10:04 am)
Re: [LAD] Let's kill EPAMP???, Stefano D'Angelo, (Wed Jun 4, 10:17 am)
Re: [LAD] Let's kill EPAMP???, Nedko Arnaudov, (Mon Jun 2, 5:36 pm)
Re: [LAD] Let's kill EPAMP???, Stefano D'Angelo, (Mon Jun 2, 6:16 pm)
Re: [LAD] Let's kill EPAMP???, Nedko Arnaudov, (Tue Jun 3, 8:51 am)
Re: [LAD] Let's kill EPAMP???, Stefano D'Angelo, (Tue Jun 3, 11:58 am)
Re: [LAD] Let's kill EPAMP???, Nedko Arnaudov, (Tue Jun 3, 1:11 pm)
Re: [LAD] Let's kill EPAMP???, Dmitry Baikov, (Tue Jun 3, 3:10 pm)
Re: [LAD] Let's kill EPAMP???, Stefano D'Angelo, (Tue Jun 3, 4:57 pm)
Re: [LAD] Let's kill EPAMP???, Steve Harris, (Tue Jun 3, 8:30 am)
Re: [LAD] Let's kill EPAMP???, Stefano D'Angelo, (Tue Jun 3, 11:53 am)
Re: [LAD] Let's kill EPAMP???, Steve Harris, (Tue Jun 3, 5:34 pm)
Re: [LAD] Let's kill EPAMP???, Paul Davis, (Tue Jun 3, 5:54 pm)
Re: [LAD] Let's kill EPAMP???, Steve Harris, (Wed Jun 4, 9:07 am)
Re: [LAD] Let's kill EPAMP???, Arnold Krille, (Mon Jun 2, 5:01 pm)
Re: [LAD] Let's kill EPAMP???, Wolfgang Woehl, (Mon Jun 2, 6:18 pm)
Re: [LAD] Let's kill EPAMP???, Arnold Krille, (Mon Jun 2, 8:29 pm)
Re: [LAD] Let's kill EPAMP???, Stefano D'Angelo, (Mon Jun 2, 8:59 pm)
Re: [LAD] Let's kill EPAMP???, Arnold Krille, (Tue Jun 3, 6:34 am)
Re: [LAD] Let's kill EPAMP???, Stefano D'Angelo, (Tue Jun 3, 6:47 am)
Re: [LAD] Let's kill EPAMP???, Arnold Krille, (Tue Jun 3, 7:51 am)
Re: [LAD] Let's kill EPAMP???, Stefano D'Angelo, (Tue Jun 3, 11:26 am)
Re: [LAD] Let's kill EPAMP???, Stefano D'Angelo, (Mon Jun 2, 5:08 pm)