Re: [LAD] Attenuation of sounds in 3D space

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From: <fons@...>
To: <linux-audio-dev@...>
Date: Thursday, July 22, 2010 - 3:02 pm

On Thu, Jul 22, 2010 at 10:35:15AM -0400, Paul Davis wrote:

> On Thu, Jul 22, 2010 at 10:29 AM, Chris Cannam

The first order B-format consists of four signals:

W: equivalent to an 'omni' microphone,
X,Y,Z: equivalent to figure-of-eight microphones
pointing forward/back, left/right, and up/
down respectively.

Combining these you can synthesize any type of first
order mic, going from omni, over subcardioid, cardioid,
hypercardioid to bidirectional, and in any direction.

So starting with B-format, you can convert it to stereo
using e.g. two figure-of-eights at 90 degrees (Blumlein)
or two cardioids at 110 degrees (ORTF), etc.

The type of mics and their angle will determine the
direct to reverberation ratio to some extent, and
therefor the apparent placement of the stereo mic.

Such a 'virtual stereo mic' is part of Tetraproc, and
there's also a Ladspa plugin doing this. The latter has
some problems in Ardour as it has 4 ins and 2 outs, and
Ardour get confused by this and will (IIRC) copy inputs
3 and 4 to the outputs while it shouldn't do that.

Another way is to decode to a number of speaker signals
and then use HRIR (head-related impulse responses) to
convert to binaural. Ambdec + Jconvolver (or just
Jconvolver with some extra prepartion) can do this.

Ciao,

--
FA

There are three of them, and Alleline.

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Re: [LAD] Floating point processing and high dynamic range a..., Philipp Überbacher, (Wed Jul 21, 11:05 pm)
Re: [LAD] Floating point processing and high dynamic range a..., Philipp Überbacher, (Thu Jul 22, 1:16 am)
Re: [LAD] Floating point processing and high dynamic range a..., Philipp Überbacher, (Thu Jul 22, 10:32 am)
Re: [LAD] Floating point processing and high dynamic range a..., Jörn Nettingsmeier, (Wed Jul 21, 6:21 pm)
[LAD] Attenuation of sounds in 3D space, JohnLM, (Wed Jul 21, 7:06 pm)
Re: [LAD] Attenuation of sounds in 3D space, JohnLM, (Thu Jul 22, 10:20 am)
Re: [LAD] Attenuation of sounds in 3D space, Ralf Mardorf, (Wed Jul 21, 7:21 pm)
Re: [LAD] Attenuation of sounds in 3D space, Arnold Krille, (Wed Jul 21, 8:36 pm)
Re: [LAD] Attenuation of sounds in 3D space, Ralf Mardorf, (Wed Jul 21, 8:58 pm)
Re: [LAD] Attenuation of sounds in 3D space, Ralf Mardorf, (Wed Jul 21, 9:28 pm)
Re: [LAD] Attenuation of sounds in 3D space, Arnold Krille, (Wed Jul 21, 11:08 pm)
Re: [LAD] Attenuation of sounds in 3D space, Fernando Lopez-Lezcano, (Thu Jul 22, 2:58 am)
Re: [LAD] Attenuation of sounds in 3D space, Patrick Shirkey, (Thu Jul 22, 3:38 am)
Re: [LAD] Attenuation of sounds in 3D space, Paul Davis, (Thu Jul 22, 12:11 pm)
Re: [LAD] Attenuation of sounds in 3D space, Arnold Krille, (Thu Jul 22, 6:30 am)
Re: [LAD] Attenuation of sounds in 3D space, Ralf Mardorf, (Wed Jul 21, 9:18 pm)
Re: [LAD] Attenuation of sounds in 3D space, James Morris, (Thu Jul 22, 8:53 am)
Re: [LAD] Attenuation of sounds in 3D space, Arnold Krille, (Wed Jul 21, 11:04 pm)
Re: [LAD] Attenuation of sounds in 3D space, Florian Faber, (Fri Jul 23, 10:52 am)
Re: [LAD] Attenuation of sounds in 3D space, Ralf Mardorf, (Thu Jul 22, 12:01 pm)
Re: [LAD] Attenuation of sounds in 3D space, Fernando Lopez-Lezcano, (Thu Jul 22, 5:52 pm)
Re: [LAD] Attenuation of sounds in 3D space, Ralf Mardorf, (Thu Jul 22, 6:23 pm)
Re: [LAD] Attenuation of sounds in 3D space, Fernando Lopez-Lezcano, (Thu Jul 22, 6:51 pm)
Re: [LAD] Attenuation of sounds in 3D space, Arnold Krille, (Thu Jul 22, 12:51 pm)
Re: [LAD] Attenuation of sounds in 3D space, Paul Davis, (Wed Jul 21, 9:10 pm)
Re: [LAD] Attenuation of sounds in 3D space, Ralf Mardorf, (Wed Jul 21, 9:24 pm)
Re: [LAD] Attenuation of sounds in 3D space, Paul Davis, (Wed Jul 21, 9:45 pm)
Re: [LAD] Attenuation of sounds in 3D space, Ralf Mardorf, (Thu Jul 22, 11:45 am)
Re: [LAD] Attenuation of sounds in 3D space, Paul Davis, (Thu Jul 22, 11:48 am)
Re: [LAD] Attenuation of sounds in 3D space, Chris Cannam, (Thu Jul 22, 2:29 pm)
Re: [LAD] Attenuation of sounds in 3D space, Arnold Krille, (Thu Jul 22, 2:45 pm)
Re: [LAD] Attenuation of sounds in 3D space, JohnLM, (Wed Jul 28, 7:46 pm)
Re: [LAD] Attenuation of sounds in 3D space, Arnold Krille, (Thu Jul 29, 1:58 am)
Re: [LAD] Attenuation of sounds in 3D space, JohnLM, (Thu Jul 29, 11:34 am)
Re: [LAD] Attenuation of sounds in 3D space, Jörn Nettingsmeier, (Thu Jul 29, 12:41 pm)
Re: [LAD] Attenuation of sounds in 3D space, Gene Heskett, (Thu Jul 29, 1:21 pm)
Re: [LAD] Attenuation of sounds in 3D space, JohnLM, (Thu Jul 29, 1:59 pm)
Re: [LAD] Attenuation of sounds in 3D space, Ralf Mardorf, (Thu Jul 29, 2:25 pm)
Re: [LAD] Attenuation of sounds in 3D space, Gene Heskett, (Thu Jul 29, 3:06 pm)
Re: [LAD] Attenuation of sounds in 3D space, Ralf Mardorf, (Thu Jul 29, 3:21 pm)
Re: [LAD] Attenuation of sounds in 3D space, Ralf Mardorf, (Thu Jul 29, 2:14 pm)
Re: [LAD] Attenuation of sounds in 3D space, Fernando Lopez-Lezcano, (Thu Jul 29, 5:00 pm)
Re: [LAD] Attenuation of sounds in 3D space, Ralf Mardorf, (Thu Jul 29, 5:32 pm)
Re: [LAD] Attenuation of sounds in 3D space, Ralf Mardorf, (Thu Jul 29, 5:43 pm)
Re: [LAD] Attenuation of sounds in 3D space, Philipp Überbacher, (Thu Jul 29, 5:58 pm)
Re: [LAD] Attenuation of sounds in 3D space, Ralf Mardorf, (Thu Jul 29, 5:28 pm)
Re: [LAD] Attenuation of sounds in 3D space, Lorenzo, (Thu Jul 29, 6:50 am)
Re: [LAD] Attenuation of sounds in 3D space, Paul Davis, (Thu Jul 22, 2:35 pm)
Re: [LAD] Attenuation of sounds in 3D space, , (Thu Jul 22, 3:02 pm)
Re: [LAD] Attenuation of sounds in 3D space, Jörn Nettingsmeier, (Thu Jul 22, 10:40 pm)
Re: [LAD] Attenuation of sounds in 3D space, Gene Heskett, (Thu Jul 22, 6:15 pm)
Re: [LAD] Attenuation of sounds in 3D space, Jörn Nettingsmeier, (Thu Jul 22, 11:00 pm)
Re: [LAD] Attenuation of sounds in 3D space, Ralf Mardorf, (Thu Jul 22, 6:43 pm)
Re: [LAD] Attenuation of sounds in 3D space, Jörn Nettingsmeier, (Thu Jul 22, 11:11 pm)
Re: [LAD] Attenuation of sounds in 3D space, Ralf Mardorf, (Fri Jul 23, 6:51 am)
Re: [LAD] Attenuation of sounds in 3D space, Fernando Lopez-Lezcano, (Fri Jul 23, 5:03 pm)
Re: [LAD] Attenuation of sounds in 3D space, Ralf Mardorf, (Sat Jul 24, 8:45 am)
Re: [LAD] Attenuation of sounds in 3D space, Jörn Nettingsmeier, (Sat Jul 24, 9:20 am)
Re: [LAD] Attenuation of sounds in 3D space, Ralf Mardorf, (Fri Jul 23, 6:57 am)
Re: [LAD] Attenuation of sounds in 3D space, Folderol, (Wed Jul 21, 9:23 pm)
Re: [LAD] Attenuation of sounds in 3D space, Patrick Shirkey, (Thu Jul 22, 2:23 am)
Re: [LAD] Attenuation of sounds in 3D space, Ralf Mardorf, (Wed Jul 21, 9:30 pm)
Re: [LAD] Attenuation of sounds in 3D space, JohnLM, (Wed Jul 21, 8:35 pm)