Re: [LAD] Determining Phase

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To: <linux-audio-dev@...>
Date: Monday, June 27, 2011 - 8:16 pm

On Mon, Jun 27, 2011 at 02:35:23PM +0200, pshirkey@boosthardware.com wrote:

> Would this result in some kind of reverb type effect as Fons suggested?

One of them would sound like a resonance, it would 'smear out' some
frequency bands. Many of them combined could be made to sound like a
reverb. Such filters are commonly used as part of reverb algorithms,
e.g. zita-rev1 has 8 of them.

> I'm looking for a way to adjust the phase of a signal rather than the

Tricky. A sudden change of phase would sound as a click, and
a gradual one would be a change of frequency. This is because
phase and frequency are related:

frequency = derivative of phase,
phase = integral of frequency.

Are you somehow trying to match phases across a crossfade
or something similar ? There's no general solution for that.
The way apps like e.g. zita-at1 do this is to estimate the
pitch (fundamental frequency) of the signal and either skip
or jump ahead an integral number of cycles with a crossfade.
That way the phases do match. There's AFAIK no solution for
this for an arbitrary signal.

Ciao,

--
FA

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Messages in current thread:
[LAD] Determining Phase, , (Sat Jun 25, 2:29 pm)
Re: [LAD] Determining Phase, Gordon JC Pearce, (Sun Jun 26, 3:24 pm)
Re: [LAD] Determining Phase, gene heskett, (Sun Jun 26, 6:54 pm)
Re: [LAD] Determining Phase, Gordon JC Pearce, (Sun Jun 26, 10:01 pm)
Re: [LAD] Determining Phase, Duncan Gray, (Mon Jun 27, 12:50 am)
Re: [LAD] Determining Phase, Fons Adriaensen, (Sun Jun 26, 8:08 pm)
Re: [LAD] Determining Phase, Duncan Gray, (Sun Jun 26, 3:14 am)
Re: [LAD] Determining Phase, , (Sun Jun 26, 8:56 am)
Re: [LAD] Determining Phase, Jörn Nettingsmeier, (Sun Jun 26, 9:58 am)
Re: [LAD] Determining Phase, Arnold Krille, (Sun Jun 26, 3:47 pm)
Re: [LAD] Determining Phase, Jörn Nettingsmeier, (Sun Jun 26, 4:06 pm)
Re: [LAD] Determining Phase, Arnold Krille, (Sun Jun 26, 4:24 pm)
Re: [LAD] Determining Phase, Rui Nuno Capela, (Sat Jun 25, 10:40 pm)
Re: [LAD] Determining Phase, , (Sun Jun 26, 9:19 am)
Re: [LAD] Determining Phase, Rui Nuno Capela, (Sun Jun 26, 4:36 pm)
Re: [LAD] Determining Phase, Fons Adriaensen, (Sat Jun 25, 7:30 pm)
Re: [LAD] Determining Phase, Gabriel M. Beddingfield, (Sat Jun 25, 6:55 pm)
Re: [LAD] Determining Phase, Fons Adriaensen, (Sat Jun 25, 7:49 pm)
Re: [LAD] Determining Phase, Emanuel Rumpf, (Sat Jun 25, 10:04 pm)
Re: [LAD] Determining Phase, Gabriel M. Beddingfield, (Sat Jun 25, 10:44 pm)
Re: [LAD] Determining Phase, Emanuel Rumpf, (Sat Jun 25, 11:27 pm)
Re: [LAD] Determining Phase, Emanuel Rumpf, (Sat Jun 25, 10:30 pm)
Re: [LAD] Determining Phase, Jörn Nettingsmeier, (Sat Jun 25, 10:23 pm)
Re: [LAD] Determining Phase, Fons Adriaensen, (Sun Jun 26, 2:17 am)
Re: [LAD] Determining Phase, Jörn Nettingsmeier, (Sun Jun 26, 9:43 am)
Re: [LAD] Determining Phase, Fons Adriaensen, (Sun Jun 26, 11:26 am)
Re: [LAD] Determining Phase, , (Sun Jun 26, 8:50 am)
Re: [LAD] Determining Phase, Fons Adriaensen, (Sun Jun 26, 12:56 pm)
Re: [LAD] Determining Phase, Erik de Castro Lopo, (Sun Jun 26, 10:27 am)
Re: [LAD] Determining Phase, , (Mon Jun 27, 12:41 pm)
Re: [LAD] Determining Phase, Fons Adriaensen, (Mon Jun 27, 8:16 pm)
Re: [LAD] Determining Phase, Fons Adriaensen, (Mon Jun 27, 8:19 pm)
Re: [LAD] Determining Phase, Jörn Nettingsmeier, (Mon Jun 27, 1:14 pm)
Re: [LAD] Determining Phase, Folderol, (Sat Jun 25, 10:35 pm)
Re: [LAD] Determining Phase, Gabriel M. Beddingfield, (Sat Jun 25, 9:33 pm)
Re: [LAD] Determining Phase, Jörn Nettingsmeier, (Sat Jun 25, 3:57 pm)