Re: [Sursound] Linux support for Octomic

[Bearcat Şándor]

Fantastic news Fons. Thank you for your continuing great work in bringing
we audio/Linux geeks great software and the ability to run with the Mac and
Windows users.

On Tue, Mar 27, 2018 at 1:21 PM, Fons Adriaensen 
wrote:

> Hello all,
>
> This is to announce that I will support Core Sound's new Octomic
>  in the same way as the
> Tetramic.
>
> Currently the 'octofile' program is available. This is a command
> line file processor performing the A/B conversion. Input can be
> 1, 2, 4, or 8 files (raw capsule signals), output is a 2nd order
> Ambisonic file in either the legacy FuMa/amb format, or the now
> de facto standard Ambix format (SN3D/ACN), or even N3D/ACN if
> you want that. Output can be wav, aiff, caf, or flac.
>
> A real-time processor 'octoproc' will follow in a month or so.
> This will have the same features as tetraproc: Jack interface,
> real-time A/B conversion, metering and stereo monitoring.
>
> The software will be available free (in source form) to anyone
> who has bought or ordered an OctoMic.
>
> Ciao,
>
> --
> FA
>
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>



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Bearcat M. Şándor
Feline Soul Systems LLC
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Re: [Sursound] Massless speakers

[Bearcat Şándor]

Accapella Audio Arts has been making horns with plasma tweeters for a while
now. They are some of the largest, and most expensive speakers made.
Awesome in thier rediculousness, i'd be afraid that someone would get drunk
at my home and mistake them for a sink or a urinal.

http://www.acapella.de/en/

On Sun, Mar 25, 2018 at 1:23 AM, Augustine Leudar  wrote:

> Ive been wondering for a while whether it was possible to use
> electromagnetic waves interferance patterns to generate sound in 3D space
> - the conclusions my physisit friends had was yes - possible - but not
> without killing anyone that heard it .Plamsa is a bit different of course
> to an EM wave
>
> On 25 March 2018 at 07:45, Gary Gallagher  wrote:
>
> > Never heard of this. Using laser plasma as driver for a speaker. Here as
> > weapon - but it would be interesting to hear/see a  refined version of
> > this. I'm curious about the spinning disk set up at the end of the video
> > there appears to be some sort of modulation in the sound.
> >
> > US MILITARY DEVELOPING LASER PLASMA SPEAKERS
> >  > laser-plasma-speakers/>
> >
> > Gary
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> >
>
>
>
> --
> Dr. Augustine Leudar
> Artistic Director Magik Door LTD
> Company Number : NI635217
> Registered 63 Ballycoan rd,
> Belfast BT88LL
> www.magikdoor.net
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Bearcat M. Şándor
Feline Soul Systems LLC
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[Sursound] A submittal for a patent on Ambisonics?

[Bearcat Şándor]

I don't know a lot about patent law, but is this an attempt to tie up our
beloved Ambisonics?

http://www.freepatentsonline.com/y2017/0366912.html

If so, can we do anything about it?
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Re: [Sursound] Brahma microphones

[Bearcat Şándor]

On Mon, Oct 2, 2017, 00:46 umashankar manthravadi 
wrote:

>
> Just to let everyone know, I have restarted making Brahma microphones in
> Bangalore.
>

Congratulations Umashankar! I look forwards to your success.
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Re: [Sursound] NYT: "Surround Sound? You Ain’t Heard Nothing Yet"

[Bearcat Şándor]

Does anyone know anything more about the ambisonic speaker matrix used
(speaker brand/model) and what the mic she used was?

On Sat, Jul 15, 2017 at 1:55 PM, Steven Boardman 
wrote:

> The article was great. I wish i had heard the performance myself.
> Anyone got a recording of the inside of a balloon being rubbed? :)
> It's good that the audio system  (and the audio art), got a review in
> itself. Without being tainted by the visual, and the stigma that brings.
> Especially with the current hype of VR/AR 360 video, and the afterthought
> of only a headphone mix!
>
> Steve
>
>
> On 15 Jul 2017 18:14, "Courville, Daniel" 
> wrote:
>
> https://www.nytimes.com/2017/07/14/arts/music/surround-sound
> -you-aint-heard-nothing-yet.html
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Re: [Sursound] What does a mic with more than 4 channels give you?

[Bearcat Şándor]

Thank you both for your answers!  That helps a lot. So, what i'm
understanding is that more speakers will give you less 'holes' in the sound
field and more channels will give you a more realistic sound field in a
larger room with more people. So 4-channels would suffice for a few people
in a mid-field environment, you'd want more for a larger room and more
listeners? Or.. where does one apply this channels vs speakers when talking
about playback vs recording?  Uh...

Bearcat


On Thu, Apr 25, 2013 at 4:03 PM, Fons Adriaensen f...@linuxaudio.orgwrote:

 On Thu, Apr 25, 2013 at 02:50:24PM -0600, Bearcat M. Şándor wrote:

  As i'm still learning about Ambisonics (mostly trying to wrap my fuzzy
 head
  around the math), there's something i don't understand.
 
  If the 4 channels of a b-format mic give you all you need for the
  mathematical computations for 3-D space, why do we have Ambisonic mics
 with
  more than 4 channels and orders with 8, 16 and more channels?  What does
  having a 4 channel (w, x, y and z) mic restrict you?

 There is no simple answer to your question.

 As Sampo as already pointed out, first order AMB signals provide
 all the info there is about the sound field in a single point.
 The physics and maths being what they are, they also define the
 sound field in an area around that point. The size of that area
 depends on the frequency. For first order the 'extrapolation'
 works well up to a distance of around 1/4 to 1/3 of a wavelength.
 So the area it covers will be quite large at low frequencies (LF),
 but gets very small for medium (MF) and high (HF) frequencies.
 Above a few hundred Hz it is so small that it is impossible even
 for a single listener to have both ears inside the area in which
 the sound field is accurately reconstructed.

 So for MF and HF Ambisonic decoders use an ad-hoc approximation
 which is based on psycho-acoustics and which works well in practice.
 That is the reason why you need a frequency-dependent decoder,
 either dual-band or using shelf filters. So far for first order.

 Higher order Ambisonics provides two things. First, the area in
 which the sound field is reconstructed 'exactly' becomes larger,
 more or less proportional to order. But in practice little is gained
 from this and we still need the 'approximation' for the mid and high
 frequency range. But HOA also allows this approximation to be much
 more accurate, to the point that for third order or above, in practice
 it can be 'almost perfect'. This allows HOA to work in a much larger
 listening area than first order, i.e. to serve a large audience, and
 also to be usable in situations were for practical reasons (related
 to speaker placement) first order would not work well.

 To really fully understand the why and how you'll need the maths.
 What I wrote above is an attempt to explain things in intuitive
 terms, which means to simplify things, but hopefully not to the
 point where the essence is lost.

 Ciao,

 --
 FA

 A world of exhaustive, reliable metadata would be an utopia.
 It's also a pipe-dream, founded on self-delusion, nerd hubris
 and hysterically inflated market opportunities. (Cory Doctorow)

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Bearcat M. Şándor
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