Re: [Sursound] Soundfield MK IV Disassembly

[Richard Lee]

> I have a question for the keepers of ancient wisdom: how does one remove 
the capsule assembly from a Soundfield MK IV microphone? I have one on 
which the 1 kilohm "capsule heater" resistor has gone open circuit. The 
cone on the MK V and newer is split and comes apart pretty readily, but the 
MK IV cone is solid and it's not apparent how to reach the resistor.

Rudy, It's more than 30 yrs since I took a Mk4 capsule assembly apart so 
bear with me I'm pontificating from the wrong orifice.

1   Unsolder the leads from capsule to PCB.
Can't remember if you can reach this from inside as the connections may 
be 
in the cone section.
If so (!!#*??), you'll have to disassemble the capsule assembly, remove 
at 
least 2 capsules on their tetrahedron sections and unsolder from the tags 
behind the capsule.

Keep the capsules in their little holder to provide some measure of 
protection but this is still a brain surgery type operation.

2   The tetrahedron stalk is screwed to a brass block on the PCB.  The 1k 
resistor is sandwiched to the block/stalk in some way which I've long 
forgotten.  IIRC, there was another small PCB whose sole purpose was to 
clamp the resistor.

3   Removing the tetrahedron allows the cone to come off.

I you have the set of dwgs which were supplied with early Mk4s, there 
should be one that makes this clearer (or not).

My apologies for this Heath Robinson design from my mispent youth.
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Re: [Sursound] Flac for FOA or amb files?

[Bob Burton]

Here are two discussions on doing that:


http://www.quadraphonicquad.com/forums/showthread.php?21247-Making-Quadraphonic-and-5-1-files-for-music-server
<http://www.quadraphonicquad.com/forums/showthread.php?21247-Making-Quadraphonic-and-5-1-files-for-music-server>

http://www.quadraphonicquad.com/forums/showthread.php?19191-PC-for-Multichannel-Music-Playback-What-s-your-Setup

On Fri, Mar 25, 2016 at 3:14 PM, Bo-Erik Sandholm <bosses...@gmail.com>
wrote:

> Has anyone a procedure or description on how to create 4 channel
> Flac flac files?
>
> I want to use VLC as a player on windows to start a vst chain for FOA to
> binaural processing.
>
> Best Regards
> Bo-Erik
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-- 
Bob
-- 
Audio Rents, Inc.
4209 W. Vanowen Place
Burbank, CA 91505
323-874-1000
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Re: [Sursound] OT Stereo stage width - Was: Static stereo source in rotating soundfield, possible?

[David Pickett]

At 20:51 29-03-16, Peter Lennox wrote:
>wasn't the original conception for stereo = 90 degrees, but 'hole in
>the middle' effects led to standardising on the narrower figure?

There seemd to be an echo in here!

Running down the email and deleting as I go, I come to:

>> From: David Pickett 
>> Date: 28 March 2016 19:33:08 BDT
>>
>> The problem with speakers at +/- 45 degrees is that one needs a
>> wide room if one is to sit at a decent distance from them.

Somebody else said that he has encountered people who have 
difficulties with stereo.  I dont and I have personally never found a 
student who did.  I have tried 90 degrees, and I am quite happy with 
it.  I have no problem with hole in the middle with 90 degree 
separation of speakers.


The distance thing depends on how close you want to sit to the 
speakers.  My stereo speakers are 8ft apart.  If I sit at the point 
of an equilateral triangle, I am 7ft back -- 4/tan(30).  If I want to 
be 8ft from each speaker when they are at +/-45 degrees, they have to 
be 11.3 ft apart -- rt(2)x8 -- and I am then 5.6ft back from the line 
joining the two speakers.  I find this necessary in order not to be 
too close to the speakers.  I have managed this in a much larger room 
than I have at present, but adding a minimum of 4ft between each 
speaker and the side wall demands a minimum room width of about 20ft.


The 8ft square speaker positions that I currently use for both 2.0 
and 4.0 means that I sit between the two rear speakers.  For 2.0, the 
angle of the front speakers is thus about 63 degrees -- atan(2).  As 
I have mostly ambience & audience noise on the rear, having the two 
rears to left and right of me works well in 4.0.  Sitting in the 
middle of the square, as I do briefly to evalute quality, means that 
all the speakers are closer to me than I like.


David

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Re: [Sursound] Ambi Head

[Charles Verron]

Thanks for your comment Dave.
For info, the intro price ends in three days (59 instead of 99 euros).
Feedback and feature requests are welcome for the next releases.

Best regards,

Charles 
www.noisemakers.fr

On 13 mars 2016, at 13:36, Dave Hunt  wrote:

> Hi,
> 
> I listened to this using Max/MSP with a mono sound source and my own 
> first-order ambisonic panner. With the default HRIR it is generally 
> convincing with no readily audible effect on the tonality of the sound except 
> when panning up or down, which is probably to be expected.
> 
> A bit of a bargain at 59 Euros.
> 
> It seems to be a 4 in 2 out plug-in, so first order only.
> 
> Logic has some very curious things going on for anything beyond "quad". My 
> experiments with Logic 9 indicate that it is usable for first order 
> ambisonics in a fairly limited fashion. This plug-in should be placed on a 
> "Quad" output, which is fed ambisonic encoded four channel signals.
> 
> Ciao,
> 
> Dave Hunt
> 
> 
> On 11 Mar 2016, at 17:00, sursound-requ...@music.vt.edu wrote:
> 
>> From: Jon Honeyball 
>> Date: 11 March 2016 10:29:04 GMT
>> To: Surround Sound discussion group 
>> Subject: Re: [Sursound] Ambi Head
>> 
>> 
>> Interesting – much cheaper than the alternative.
>> 
>> On 10/03/2016, 05:53, "Sursound on behalf of Paul Doornbusch" 
>>  wrote:
>> 
>>> Hi,
>>> 
>>> Has anyone tried Ambi Head - http://www.noisemakers.fr/ambi-head/ 
>>>  ?
>>> 
>>> I’m just curious how well it works if people have tried it.
>>> 
>>> Thanks,
>>> Paul
>>> 
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>>> edit account or options, view archives and so on.
>> 
>> 
>> 
>> 
>> From: umashankar manthravadi 
>> Date: 11 March 2016 11:00:30 GMT
>> To: Jon Honeyball , Surround Sound discussion group 
>> 
>> Subject: Re: [Sursound] Ambi Head
>> 
>> 
>> Just downloaded the demo version and will try it. Highly kicked that brahma 
>> is there on their list!
>> 
>> umashankar
>> 
>> Sent from Mail for Windows 10
>> 
>> From: Jon Honeyball
>> Sent: Friday, March 11, 2016 3:59 PM
>> To: Surround Sound discussion group
>> Subject: Re: [Sursound] Ambi Head
>> 
>> Interesting – much cheaper than the alternative.
>> 
>> On 10/03/2016, 05:53, "Sursound on behalf of Paul Doornbusch" 
>>  wrote:
>> 
>>> Hi,
>>> 
>>> Has anyone tried Ambi Head - http://www.noisemakers.fr/ambi-head/ 
>>>  ?
>>> 
>>> I’m just curious how well it works if people have tried it.
>>> 
>>> Thanks,
>>> Paul
> 
>> From: søren Bendixen 
>> Date: 12 March 2016 10:37:58 GMT
>> To: Surround Sound discussion group 
>> Subject: Re: [Sursound] Ambi Head
>> 
>> 
>> It does´t work with Logic Pro X - but almost none of the all the plugins
>> for decoding/converting ambisonics works in logic - or the work with
>> limitations, odd behavior or only  fine up to 5.1. For other DAW´s Ambi
>> Head seems like a cool plug in
>> 
>> Regards
>> Søren Bendixen
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Re: [Sursound] OT Stereo stage width - Was: Static stereo source in rotating soundfield, possible?

[Peter Lennox]

ent distance from them.
> However, it can be impressive.  I have found the effect even better
> if a centre speaker of the same typeis added.  Gerzon gave the
> ratios necessary for matrixing 2 channel stereo into this 3 channel
> format.  It is not simply a question of feeding the centre speaker
> with a -3dB sum, but quite easy to implement.
>
> David
>

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Re: [Sursound] OT Stereo stage width - Was: Static stereo source in rotating soundfield, possible?

[Dave Hunt]

Hi Stefan,

The "stereo triangle" page you pointed to says, "By making the  
distance between the speakers and each speaker to you (the center  
listening point) the same, you have made an equilateral triangle.  
This stereo set up ensures that the sound from each speaker has the  
exact same distance to travel to reach you." The first sentence is  
true. However an equilateral triangle is not necessary to ensure that  
each speaker is at the same distance to a laterally central listener.


For an equilateral triangle the sound would travel the same distance  
from one speaker to another as it does to travel to the listener. I  
don't see that this is of any importance. OK some sound from each  
speaker would be reflected by the other, but this would be off axis  
from the source speaker and reflected backwards due to the speakers  
being angled inwards towards the listener. I would suggest that this  
would be barely audible in comparison with other acoustic room effects.


The -3dB central panning level is a result of the sine/cosine panning  
law. One speaker is at zero degrees, the other at 90 degrees. When  
fed a mono signal an angle of 0 results in a gain of one to one  
speaker and zero to the other. 90 degrees reverses the result. 45  
degrees gives a gain to each speaker of 0.707, or -3dB. This appears  
to result in a good phantom central image. With a linear panning law  
the gain to each speaker would be 0.5 or -6dB, which appears to  
result in a "hole in the middle".


Why plus and minus 30 degree separation for "normal stereo" is still  
a mystery to me.


Ciao,

Dave Hunt


From: Stefan Schreiber <st...@mail.telepac.pt>
Date: 28 March 2016 19:07:14 BDT
To: eero@dlc.fi, Surround Sound discussion group  
<sursound@music.vt.edu>
Subject: Re: [Sursound] OT Stereo stage width - Was: Static stereo  
source in rotating soundfield, possible?



Eero Aro wrote:


Hi Dave

I have a feeling that this subject has been discussed in Sursound  
many times

before.

The point in my reply was that when you use two channel stereo in the
surround sound field, a wide angle between the virtual  
loudspeakers doesn't

work too well.

I don't know where the 60 degrees angle between the stereo  
speakers originally
came from. Blumlein used a 30...35 degrees angle between the  
speakers.
When I started to work in broadcasting in 1977, all control rooms  
were equipped
with a stereo listening setup. The speakers were arranged so that  
they were in a

60 degrees angle from the mixer's seat.

I have noticed with students, that there is a wide spectrum of  
people, most do
can integrate a stereo sound image between the loudpeakers with 60  
degrees.
I have met people, who tell that they cannot hear any kind of a  
stereo image
between the loudspeakers, whatever the angle. They hear sound from  
two speakers.
At the other end are people, who can hear an integrated stereo  
image with 90

degrees.

I don't know. Anyway, in music industry and boradcasting, you need  
to have some
standard. The broadcasting house I worked in, had then 250 radio  
studios. The
listening conditions needed to be at least somewhat similar  
between control rooms,
so that you could continue the work in another studio another day.  
Why 60 degrees

was chosen, I don't know.

Eero


Because of the < stereo triangle > concept?

http://www.centerpointaudio.com/SpeakerPlacementAndPositioning.aspx

"Equilateral", bla bla bla... the angle is 60º in the equilateral  
bla bla bla 

Best,

Stefan




From: David Pickett <d...@fugato.com>
Date: 28 March 2016 19:33:08 BDT
To: Surround Sound discussion group <sursound@music.vt.edu>
Subject: Re: [Sursound] OT Stereo stage width - Was: Static stereo  
source in rotating soundfield, possible?



The problem with speakers at +/- 45 degrees is that one needs a  
wide room if one is to sit at a decent distance from them.   
However, it can be impressive.  I have found the effect even better  
if a centre speaker of the same typeis added.  Gerzon gave the  
ratios necessary for matrixing 2 channel stereo into this 3 channel  
format.  It is not simply a question of feeding the centre speaker  
with a -3dB sum, but quite easy to implement.


David



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Re: [Sursound] Static stereo source in rotating soundfield, possible?

[Peter Lennox]

Actually, dissenting voices apart, I can see how one might want some items in a 
sound field to be localisable, and some not. If this is actually what is wanted 
here - and taking into account one might want a particular component to be 
'everywhere and nowhere' - but not inside the head - then a decorrelated 
version of the mono version of the desired unlocalisable-but-externalised 
signal could be generated and fed to the array (so basically, it's decorrelated 
in each speaker feeds with respect to all others) - so no precedence or phantom 
imaging.

when the rest of the field is rotated - although this is too, it still won't be 
localisable and the impression should be that it doesn't particularly move.

The perceptual impression ought to be that this is underlying incidental music 
(like film music) not part of the actual scene depicted. - We are well versed 
in listening to that.

For decorrelation methods, the same methods as in Earl Vickers' "fixing the 
phantom center: diffusing acoustical crosstalk" might be efficacious

cheers
ppl
Dr. Peter Lennox
Senior Fellow of the Higher Education Academy
Senior Lecturer in Perception
College of Arts
University of Derby

Tel: 01332 593155

From: Sursound [sursound-boun...@music.vt.edu] On Behalf Of Joseph Anderson 
[j.ander...@ambisonictoolkit.net]
Sent: 29 March 2016 00:59
To: Surround Sound discussion group
Subject: Re: [Sursound] Static stereo source in rotating soundfield,
possible?

Hello Eero,

I could say something about the competing voices (on W) inside my head...
and the difficulty in deciding which to regard as an appropriate guide.
But, this isn't a suitable forum for such discussions. ;-)


My best,


*Joseph Anderson*



*http://www.ambisonictoolkit.net/ *


On Mon, Mar 28, 2016 at 1:35 PM, Eero Aro  wrote:

> It's early days in VR.
>>
>
> I agree with Stefan.
>
> A couple of months ago I attended a seminar, where we were shown some
> 360 video examples of holiday travel advertising clips. VR is a nice tool
> for
> the travel agencies, as you can get a hint of what you could see if you
> travel
> there. It just looked like they don't know yet, how to use the medium.
>
> If I was watching such a 360 video, I'd like to localize the guide's
> voice-over
> in front of me all the time, no matter where I turn my sight. As the
> person is
> not seen in the picture, the voice-over is not in conflict with what you
> see.
>
> Also, I'd rather _not_ localize the voice-over inside my head. (Using W.)
> I would feel uncomfortable with a guide's voice inside my head.
>
> Eero
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