To: Surround Sound discussion group
Subject: Re: [Sursound] Array for sound field recording and extend the sound
image
You can make a velocity microphone by subtracting two closely spaced omnis. I
saw a paper on making ambisonic recordings like this a couple of years ago:
http://www.aes.org/e-lib
lf Of Chenrilin
Sent: 09 January 2013 03:29
To: sursound@music.vt.edu
Cc: Zhangdeming
Subject: Re: [Sursound] Array for sound field recording and extend the sound
image
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Hi Tim,
Indeed, SNR is poor at low frequencies for this sort of technique as
it relies on the phase difference between the two capsules as produced
by their separation. The separation can't be too large as once it gets
over half a wavelength the phase starts wrapping around but this means
that at l
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At 11:54 08-01-13, Tim Collins wrote:
>You can make a velocity microphone by subtracting two closely spaced omnis.
I seem to recall that Blumlein did this and also found that the s-n
ratio was poor.
David
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-Original Message-
From: Mike Felton [mailto:mjfel...@gmail.com]
Sent: 08 January 2013 00:21
To: Surround Sound discussion group
Subject: Re: [Sursound] Array for sound field recording and extend the sound
image
>
>
> Thanks very much. You are so kind. I will have a try as your suggestion.
>
> Best regards,
>
> Rilin
> Chen
Do let us know with what results !
These type of problems are usually a
>Hi,
> Seems likely then that the problem is related to the usual "in
>head" problem that many (maybe even most) people people have with
>simple, non matched HRTF based systems, whether driven from decoded
>Ambisonic signals or from binaurally recorded (dummy head) material.
>There's been a
>The mics are omnis
It might be stating the obvious here but how would you get ANY directional
information out of four OMNI mics close together? :-)
Surely to get a fig-8 response you need two CARDIODS back to back (one of
which is polarity reversed obviously).
Mike Felton
On 7 January 2013 23
On Mon, Jan 07, 2013 at 03:12:26PM -0800, Aaron Heller wrote:
> Without more details, it hard to speculate about problems, but I'll note
> that subtracting the outputs of two omnis to get a fig-8 response will
> result in a frequency response that rises 6dB/octave with a 90 degree phase
> shift re
Without more details, it hard to speculate about problems, but I'll note
that subtracting the outputs of two omnis to get a fig-8 response will
result in a frequency response that rises 6dB/octave with a 90 degree phase
shift relative to the sum. Unless that is corrected, these signals are not
sui
Chenrilin wrote:
> Hello, all
> I have designed an array of four microphones to get B-format signal.
...
> Then I decoded
> them to get the
> feeding signal for four loudspeakers, and used HRTFs to get the left and
> right signal for headphone.
>
> 1. Furthermore, the experiment is made that
On 7 January 2013 02:08, Chenrilin wrote:
>>Do you get the same problem if you playback through four loudspeakers, or
>
>>is it only after HRTF manipulation ?
>
>>* Does the decoding work on speakers (without HRTF) ?
>
> The mics are omnis. And it can work on speakers well. So I think
> X and Y
>Do you get the same problem if you playback through four loudspeakers, or
>is it only after HRTF manipulation ?
>We'll need a bit more information.
>* Are the mics omnis, or directional ? If directional, what
> are the directions ?
>* How exactly to you compute X and Y frm the mic signa
On Sun, Jan 06, 2013 at 09:18:43AM +, Chenrilin wrote:
> Hello, all
> I have designed an array of four microphones to get B-format signal. The
> coordinates of mics
> are mic1 (-d/2,0), mic2 (d/2,0), mic3 (0, d/2), mic4 (0,-d/2),and d is about
> 18mm.Every opposite
> pair can be composed into
> Hello, all
[ ... ]
> The W component equals to the mean of signals from four mics. Then I
> decoded them to get the
> feeding signal for four loudspeakers, and used HRTFs to get the left and
> right signal for headphone.
>
>
> 1. Furthermore, the experiment is made that a person was walking
Hello, all
I have designed an array of four microphones to get B-format signal. The
coordinates of mics
are mic1 (-d/2,0), mic2 (d/2,0), mic3 (0, d/2), mic4 (0,-d/2),and d is about
18mm.Every opposite
pair can be composed into a first order differential array and get a pattern of
figure 8. So th
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