Re: [Sursound] brahma on kickstarter

[Neil & Marcia Adams]

Don't worry, Umashankar, I once wrote an entry in the FFD catalogue 
(who remembers that?) describing an expensive mic cable as 
'inferior'. Nobody picked it up before printing. Very embarrassing!


Neil


At 10:12 AM 10/25/2013, umashankar manthravadi wrote:
thank you. they showed me the copy before putting it on and I 
thought I read it, but I don't know how that slipped through. I have 
forwarded to the embrace video people and asked them to correct it. 
it is embarrassing.


umashankar

> Date: Thu, 24 Oct 2013 19:09:25 +0100
> From: dave.mal...@york.ac.uk
> To: sursound@music.vt.edu
> Subject: Re: [Sursound] brahma on kickstarter
>
> Hmm - you may want to change "very low signal to noise ratio" to "very high
> signal to noise ratio" or "very good signal to noise ratio" :-)
>
> Good luck
>   Dave
>
>
> On 24 October 2013 15:16, umashankar manthravadi 
wrote:

>
> > the kickstarter project is now live
> >
> > 
http://www.kickstarter.com/projects/1569945514/brahma-affordable-ambisonics-microphoneumashankar

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>
>
> --
> --
> As of 1st October 2012, I have retired from the University.
>
> These are my own views and may or may not be shared by the University
>
> Dave Malham
> Honorary Fellow, Department of Music
> The University of York
> York YO10 5DD
> UK
>
> 'Ambisonics - Component Imaging for Audio'
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Re: [Sursound] Spherical speakers ?

[Neil & Marcia Adams]

Again with txt only (thank you Martin)

The late Dick Campbell designed a dodecahedron loudspeaker. Close?
http://users.rcn.com/rhcamp/dodec45.pdf 



NeilA


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Re: [Sursound] Spherical speakers ?

[Neil & Marcia Adams]

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Re: [Sursound] Spherical speakers ?

[Neil & Marcia Adams]

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[Sursound] BBC Historic Tape - Surround Experiment

[Neil & Marcia Adams]

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Re: [Sursound] Great responses to my post--thanks!

[Neil & Marcia Adams]

Hector,

For me there was a good sense of space and kids running from side to 
side but they seemed to run through or behind me instead of in front.


Cheers,
NeilA

At 11:29 12/5/2011, you wrote:

Hello Eric,

Very interesting post. I was a bit intrigued by what you had to say 
regarding binaural recordings and the lack of sense of space. 
Reproducing a sense of space is something that has interested me a 
lot as a sound artist and I've been experimenting with building 
different types of binaural mics. Here is an example recording I made:


http://soundcloud.com/hcenteno/kids-running-in-the-wychwood-barns

If I close my eyes I can really feel the space and the kids running 
in front of me, and not inside my head, but I wonder how would other 
people perceive it (I'm very familiar with the space where this was 
recorded so I wonder if that influences my perception). I've been 
also experimenting with recordings made with a first order mic 
decoded to stereo binaural with head tracking and indeed the sense 
of space works quite well, although I have to say that not as 
defined as the stereo binaural recordings (which might be a flaw on 
my process which I'm still refining).


Cheers,

Hector


On 2011-11-30, at 1:30 PM, Eric Carmichel wrote:

>  Actually, I've never experienced a sense of "open space" when 
listening to binaural recordings or simulations from HRTF IRs 
(including the often-cited IRs made by Gardner et al at MIT during 
the 1990s). I own ER-3A insert phones, Sennheiser HDA 200 
audiometric headphones, and my work-horse AKG K240 studio 
'phones--but I've yet to hear a binaural recording that replicates 
live sound--practically everything gives the usual "in-the-head"

> effect or is lateralized (versus localized).

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Re: [Sursound] Soundfield-type mics: inverting or not?

[Neil & Marcia Adams]

Who is old enough to remember the Keith Monks 'Phaserite' Checker 
http://dl.dropbox.com/u/14586505/Keith%20Monks%20Phaserite.pdf ? I 
last saw one 'in the flesh' 30-odd years ago.


If you live in Europe or U.S. you might be able to locate one, or 
maybe they're still made?


Cheers!,
Neil A

At 17:13 10/10/2011, you wrote:


On 9 Oct 2011, at 17:00, sursound-requ...@music.vt.edu wrote:
>
> Message: 7
> Date: Sun, 9 Oct 2011 09:39:36 +
> From: Fons Adriaensen 
> Subject: Re: [Sursound] Soundfield-type mics: inverting or not?
> To: sursound@music.vt.edu
> Message-ID: <20111009093936.gb11...@linuxaudio.org>
> Content-Type: text/plain; charset=us-ascii
>
> On Sun, Oct 09, 2011 at 10:16:22AM +0100, dave.mal...@york.ac.uk wrote:
>
>> Does anyone know, of the top of their heads,
>> if a film set type clapper board reliably provides a positive going
>> leading edge to it's impulse? I can't see it not, but I'd prefer that to
>> be confirmed by repeatable experiments.
>
> I wouldn't rely in it. There's some air being squeezed out, but
> that would be a low-F thing. The real 'clap' is the sound of two
> pieces of wood hitting each other - I wouldn't make any guess
> as to the polarity of that wavefront.

With larger clapper boards it is a bit of a mess, especially if you 
are a long way from the mic.


Dog training clickers (search dog clicker on Amazon) work very well; 
you can get a pretty good idea of the frequency response too by an 
fft as the click is quite sharp and short. Drilling a hole in the 
back of it helps. The one I use produces a better click when you 
release the button than when you press. They are hopeless for dog 
training, our labrador regards it as a cue to grab the clicker from 
my hand and run off with it.


Peter Fellgett used to burst a balloon (compressed air, not helium) 
at centre stage. This always produces positive pressure.


Actually, with speech you can usually see polarity (we speak using 
positive pressure, usually), so just talking to the mic from centre 
stage is better than nothing.


Geoffrey

>
> If you have a piece of bubble plastic around, making on of the
> bubbles burst should produce a 'positive' pulse...
>
> Ciao,
>
> --
> FA
>
>
>
> --
>
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>
> End of Sursound Digest, Vol 39, Issue 4
> ***

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Re: [Sursound] speaker cable resistance [was Distance perception]

[Neil & Marcia Adams]

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Re: [Sursound] speaker cable resistance [was Distance perception]

[Neil & Marcia Adams]

Am I right in thinking that the resistive component of the speaker's 
impedance is effectively in series with its inductance? Say, 5 ohms 
for an 8 ohm speaker?  If so cable resistance is not so frightening 
for domestic runs.


It's not so difficult to provide negative output impedance to counter 
the wire+speaker resistance. This can significantly increase damping 
and is sometimes used in powered 'active' speakers where all 
parameters can be controlled.


Neil Adams

At 06:41 7/27/2011, Sampo Syreeni wrote:

On 2011-07-26, Fons Adriaensen wrote:


I certainly don't want you to waste your money on fancy speaker cables.


Never thought otherwise. That's obviously never been what we do here. ;)

But resistance does matter, so a good cross section such as 2.5 
mm^2 puts you on the safe side.


What I was trying to ask is, what's the real problem with 
resistance, especially with regard to a passive speaker and a 
modern, A/B class solid state end stage? I mean, I don't really see 
cable resistance shifting their operating point much, even with 
feedback, within the audible range.


What is it that I'm missing?
--
Sampo Syreeni, aka decoy - de...@iki.fi, http://decoy.iki.fi/front
+358-50-5756111, 025E D175 ABE5 027C 9494 EEB0 E090 8BA9 0509 85C2
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Re: [Sursound] rf interference

[Neil & Marcia Adams]

Hi Jascha, Umashankar and John,

A couple of thoughts on RFI in general:

1. The interference can enter any port, even outputs, and get 
demodulated once inside, sometimes appearing as if on the input. 
Classic cases are un-/poorly- shielded headphone leads, power leads etc.


2. You can get resonant antennas due to the particular length of a 
cable. If one particular radio source is problematic, try different 
lead lengths, if available, to change the tuned frequency.


Good luck!

Neil A

At 09:00 AM 4/17/2011, Jascha Narveson wrote:


Hi, John and Umashankar -

Interesting... My radio's definitely on the recording, not the 
monitoring.  I did notice after posting my last email that the 
extension cable that comes with the TetraMic is a Mogami shielded 
cable - it's still quite thin though, the Times Square is a RF-heavy 
environment.


Has anyone had any experience with these?

http://store.shure.com/store/shure/en_US/pd/productID.104211000

I'll also try and skip the extension cable and go straight from the 
break-out cable to the PPAs, though that'll be a little awkward to set up...


Thanks again!

cheers,

j


On Apr 16, 2011, at 8:25 PM, umashankar mantravadi wrote:

>
> if the radio pick up is  happening at the mic head (possible) 
what you will need is a metal grill which is earthed. the signal is 
unbalanced till the ppa outputs. so it is best to use any extension 
cables after the point.

>
> umashankar
>
> i have published my poems. read (or buy) at 
http://stores.lulu.com/umashankar

>
>
>
>> Date: Sat, 16 Apr 2011 14:56:34 -0700
>> From: d...@dgvo.net
>> To: sursound@music.vt.edu
>> Subject: Re: [Sursound] rf interference
>>
>> I have the radio pick up problem with my Tetramic.
>> I find it is better to put the 4 XLR adaptors into my 4x3ft XLR 
cables and then plug the
>> XLR cables into my MOTU Traveller rather than use one of Lens 
extension cables and plug

>> the adaptors directly into the Traveller.
>> If I need distance I use a couple of InstaSnakes and shielded CAT5.
>> Radio pickup is still a problem in some locations though.
>> I tried wrapping multiple layers of heavy kitchen aluminium foil 
over the adapters after

>> zip-tying them to the handle of my Rycote blimp.
>> Worked OK in the kitchen, but nowhere else. :o)
>>
>> Bill
>>
>> On 16/04/2011 12:36 p.m., Jascha Narveson wrote:
>>>
>>> Hello, once again, surround list -
>>>
>>> My apologies for the continued emails from my end - as you can 
tell, I'm trying to muddle through some location recording this 
weekend, and am running in to things I've never dealt with before. To whit:

>>>
>>> I've just come back from recording in Times Square and 
discovered that I was picking up the radio. I'm using a TetraMic, 
and I'm guessing that the 6' extension cable that goes from the mic 
to the break-out cable might be the weak link, as it looks rather 
thin and is probably unshielded. From the PPAs I have four 3-foot 
XLR cables that are then going in to the 788T, so they might be 
part of the problem, as well.

>>>
>>> I know that in picking Times Square as a recording subject I'm 
walking in to one of the heavier RF zones in the city, but I'm 
hoping that somebody here might have some tips of things I can try 
to work around it...? Is there some way I can shield the cables in 
a d.i.y. fashion, for instance?

>>>
>>> thanks yet again,
>>>
>>> - jascha
>>>
>>>
>>>
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