Discussion:
MEMS speakers
(too old to reply)
Gary Gallagher
2018-01-17 00:01:46 UTC
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https://hackaday.com/2018/01/16/new-part-day-mems-loudspeakers/?_utm_source=1-2-2
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Augustine Leudar
2018-01-17 09:25:14 UTC
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Interesting..... I can think of a lot of applications for these and spatial
audio....
Post by Gary Gallagher
https://hackaday.com/2018/01/16/new-part-day-mems-
loudspeakers/?_utm_source=1-2-2
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Gary Gallagher
2018-01-19 19:04:12 UTC
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Wave field synthesis wall paper? How small does an an audio pixel have to
be?
Post by Augustine Leudar
Interesting..... I can think of a lot of applications for these and spatial
audio....
Post by Gary Gallagher
https://hackaday.com/2018/01/16/new-part-day-mems-
loudspeakers/?_utm_source=1-2-2
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Augustine Leudar
2018-01-20 01:14:23 UTC
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exactly what I was thinking Gary - except youd need a million channel
interface - there's be other ways though. Basically it would be a good way
of getting 3D audio into peoples homes - as noone can either be bothered to
set up even 4 speakers let alone some fancy atmos setup. So some kind of
wallpaper would possibly work, something that requires almost zero setup
anyway...
Post by Gary Gallagher
Wave field synthesis wall paper? How small does an an audio pixel have to
be?
Post by Augustine Leudar
Interesting..... I can think of a lot of applications for these and
spatial
Post by Augustine Leudar
audio....
Post by Gary Gallagher
https://hackaday.com/2018/01/16/new-part-day-mems-
loudspeakers/?_utm_source=1-2-2
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Post by Gary Gallagher
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Charlie Richmond
2018-01-20 02:03:51 UTC
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SoundMan-Server is a virtual matrix that has up to 1k discrete inputs and
outputs with dynamic level, eq and delay controls at each crosspoint if
that helps at all.

Charlie
Post by Augustine Leudar
exactly what I was thinking Gary - except youd need a million channel
interface - there's be other ways though. Basically it would be a good way
of getting 3D audio into peoples homes - as noone can either be bothered to
set up even 4 speakers let alone some fancy atmos setup. So some kind of
wallpaper would possibly work, something that requires almost zero setup
anyway...
Post by Gary Gallagher
Wave field synthesis wall paper? How small does an an audio pixel have to
be?
Post by Augustine Leudar
Interesting..... I can think of a lot of applications for these and
spatial
Post by Augustine Leudar
audio....
Post by Gary Gallagher
https://hackaday.com/2018/01/16/new-part-day-mems-
loudspeakers/?_utm_source=1-2-2
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Post by Gary Gallagher
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Jörn Nettingsmeier
2018-01-20 12:12:39 UTC
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Raw Message
Post by Gary Gallagher
Wave field synthesis wall paper? How small does an an audio pixel have to
be?
The question is more like "how big can you make it?". An audio "pixel"
of a square millimetre cannot produce meaningful audio frequencies if
suspended in mid-air without a baffle, you would have to get somewhat
close to the wavelength. So no million-channel audio interfaces either,
I guess the approach would be to use lots of those pixels in unison. How
you ensure good airtight coupling between them is one question, and the
other is how much excursion you can get.

Thiele-Small parameters for silicon cavities, anyone? :-D

It's quite a moonshot actually, and if you start thinking about the
complexities, that carbon nanosheet paper that came from China a few
years back doesn't sound soo far-fetched anymore, where people were
producing sound by heating surfaces with an extremely good heat
conductivity (so its thermal cycles can be at audio frequencies).
Problem there is 100% k2, as it's effectively a half-wave rectifier...
--
Jörn Nettingsmeier
De Rijpgracht 8, 1055VR Amsterdam, Nederland
Tel. +49 177 7937487

Meister für Veranstaltungstechnik (Bühne/Studio), Tonmeister VDT
http://stackingdwarves.net
Jörn Nettingsmeier
2018-01-20 12:14:30 UTC
Permalink
Raw Message
Post by Jörn Nettingsmeier
Post by Gary Gallagher
Wave field synthesis wall paper? How small does an an audio pixel have to
be?
The question is more like "how big can you make it?". An audio "pixel"
of a square millimetre cannot produce meaningful audio frequencies if
suspended in mid-air without a baffle, you would have to get somewhat
close to the wavelength. So no million-channel audio interfaces either,
I guess the approach would be to use lots of those pixels in unison. How
you ensure good airtight coupling between them is one question, and the
other is how much excursion you can get.
Thiele-Small parameters for silicon cavities, anyone? :-D
It's quite a moonshot actually, and if you start thinking about the
complexities, that carbon nanosheet paper that came from China a few
years back doesn't sound soo far-fetched anymore, where people were
producing sound by heating surfaces with an extremely good heat
conductivity (so its thermal cycles can be at audio frequencies).
Problem there is 100% k2, as it's effectively a half-wave rectifier...
Hit send too fast - meant to add that Fraunhofer in Germany has been
doing research on MEMS drivers for in-ear systems for a while, and they
combine the output of a cascade of laterally compressed nanomechanical
cavities in series to drive the eardrum.
--
Jörn Nettingsmeier
De Rijpgracht 8, 1055VR Amsterdam, Nederland
Tel. +49 177 7937487

Meister für Veranstaltungstechnik (Bühne/Studio), Tonmeister VDT
http://stackingdwarves.net
David Pickett
2018-01-20 19:35:41 UTC
Permalink
Raw Message
I hadnt seen any anouncement of this, but I have just discovered that
Firefox (Windows version) plays my surround files in surround.
Previously, for these and for the BBC experiments I have had to use
Chrome. If someone with four speakers would like to confirm that this
is true and I am not halucinating, I should be grateful.

MP4 surround test files (some made with my pantophonic mic) in
embedded HTML5 players are at

http://www.fugato.com/pickett/surround-tests.shtml

David
Paul Hodges
2018-01-20 20:29:21 UTC
Permalink
Raw Message
Post by David Pickett
I hadnt seen any anouncement of this, but I have just discovered that
Firefox (Windows version) plays my surround files in surround.
Previously, for these and for the BBC experiments I have had to use
Chrome. If someone with four speakers would like to confirm that this
is true and I am not halucinating, I should be grateful.
As I remarked recently on this list, this is routine for any up-to-date
browser, in Windows, at least (and who risks using a browser that's not
fully updated these days?). The requirement is simply that the Windows
default audio device is defined to have a suitable speaker setup.

I've confirmed this with Opera, Chrome, Firefox, Edge and IE 11.

Paul
--
Paul Hodges
David Pickett
2018-01-20 20:43:10 UTC
Permalink
Raw Message
Post by Paul Hodges
Post by David Pickett
I hadnt seen any anouncement of this, but I have just discovered that
Firefox (Windows version) plays my surround files in surround.
Previously, for these and for the BBC experiments I have had to use
Chrome. If someone with four speakers would like to confirm that this
is true and I am not halucinating, I should be grateful.
As I remarked recently on this list, this is routine for any up-to-date
browser, in Windows, at least
I dont recall seeing that. Do you know when Firefox became compliant?
Post by Paul Hodges
(and who risks using a browser that's not
fully updated these days?).
The frequency of the updates tempts me sorely!

David
Paul Hodges
2018-01-21 11:42:33 UTC
Permalink
Raw Message
Post by David Pickett
I dont recall seeing that.
28 Dec - but I see I only mentioned my default browser, without
specifying that I'd checked all of them. The conversation was about
VLC primarily.
Post by David Pickett
Do you know when Firefox became compliant?
No idea, sorry.
Post by David Pickett
The frequency of the updates tempts me sorely!
Well, it happens pretty automatically these days, though sometimes
waiting an extra 15secs for Firefox to update feels like an eternity!

Paul
--
Paul Hodges
Augustine Leudar
2018-01-20 15:36:43 UTC
Permalink
Raw Message
Youd have to have "patches" of mems working in unison I guess to get the
lower frequencies . You might be abvle to do soemthing interesting with the
ultrasonic methods the directional "zone" speakers use as well....

On 20 January 2018 at 12:12, Jörn Nettingsmeier <
Post by Gary Gallagher
Wave field synthesis wall paper? How small does an an audio pixel have to
be?
The question is more like "how big can you make it?". An audio "pixel" of
a square millimetre cannot produce meaningful audio frequencies if
suspended in mid-air without a baffle, you would have to get somewhat close
to the wavelength. So no million-channel audio interfaces either, I guess
the approach would be to use lots of those pixels in unison. How you ensure
good airtight coupling between them is one question, and the other is how
much excursion you can get.
Thiele-Small parameters for silicon cavities, anyone? :-D
It's quite a moonshot actually, and if you start thinking about the
complexities, that carbon nanosheet paper that came from China a few years
back doesn't sound soo far-fetched anymore, where people were producing
sound by heating surfaces with an extremely good heat conductivity (so its
thermal cycles can be at audio frequencies). Problem there is 100% k2, as
it's effectively a half-wave rectifier...
--
Jörn Nettingsmeier
De Rijpgracht 8, 1055VR Amsterdam, Nederland
Tel. +49 177 7937487
Meister für Veranstaltungstechnik (Bühne/Studio), Tonmeister VDT
http://stackingdwarves.net
_______________________________________________
Sursound mailing list
https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here,
edit account or options, view archives and so on.
--
Dr. Augustine Leudar
Artistic Director Magik Door LTD
Company Number : NI635217
Registered 63 Ballycoan rd,
Belfast BT88LL
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Justin Bennett
2018-01-21 11:55:49 UTC
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Message: 6
Date: Sat, 20 Jan 2018 15:36:43 +0000
Subject: Re: [Sursound] MEMS speakers
Youd have to have "patches" of mems working in unison I guess to get the
lower frequencies . You might be abvle to do soemthing interesting with the
ultrasonic methods the directional "zone" speakers use as well….
That would be pretty cool - an adaptive system where for lower frequencies you use more audiopixels,
for higher frequencies you use less, and of course the higher the frequency the more accurate localisation would be.

best, Justin


Justin Bennett

***@justinbennett.nl
www.justinbennett.nl
http://jubilee-art.org/
Jack Reynolds
2018-01-21 13:04:04 UTC
Permalink
Raw Message
Like wavefield synthesis

Sent from my iPhone
Post by Justin Bennett
Message: 6
Date: Sat, 20 Jan 2018 15:36:43 +0000
Subject: Re: [Sursound] MEMS speakers
Youd have to have "patches" of mems working in unison I guess to get the
lower frequencies . You might be abvle to do soemthing interesting with the
ultrasonic methods the directional "zone" speakers use as well….
That would be pretty cool - an adaptive system where for lower frequencies you use more audiopixels,
for higher frequencies you use less, and of course the higher the frequency the more accurate localisation would be.
best, Justin
Justin Bennett
www.justinbennett.nl
http://jubilee-art.org/
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David Pickett
2018-01-21 13:24:25 UTC
Permalink
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I should have thought that these devices are so small that one ought
to be able to anything with enough of them in strategically designed
and positioned arrays.

David
Dave Malham
2018-01-21 15:38:24 UTC
Permalink
Raw Message
Hi Justin,
Back in 1999, a student of mine, Alexis Cohen, did his Masters on what
we then called "Hyperdense Transducer Arrays", an idea that I was kicking
around at the time - you can see a hint of it my June 1999 AES UK
conference paper "Homogeneous and Non-Homogeneous Surround Sound Systems",
though without the name. Basically, the idea is that as the angular acuity
of our hearing is about 1 degree at best we should have a speaker every
degree. In the paper I published a very rough and ready way of estimating
how many speakers you'd need which came to about 10000 (according to my
paper, I'm not thinking about re-calculating it just now!). We realised
that you didn't need to drive them individually if you spread DSP chips
about the array and fed these from a (very) HOA set of signals. The DSP's
each do decodes for the closest loudspeakers. Back of the envelope
calculations said it could done for a few millions (parts cost) even back
then. Alexis's proposed solution to the bass problem was to shade off the
order of the HOA as the frequency drops, resulting in the sound being
spread over more speakers. I'm almost certain that Ricardo (Lee) has
mentioned something similar in the past. Anyway, none of this was ever
actually implemented but maybe now is the time for someone new to take up
the idea and run with it....
Post by Justin Bennett
Message: 6
Date: Sat, 20 Jan 2018 15:36:43 +0000
Subject: Re: [Sursound] MEMS speakers
Youd have to have "patches" of mems working in unison I guess to get the
lower frequencies . You might be abvle to do soemthing interesting with
the
ultrasonic methods the directional "zone" speakers use as well….
That would be pretty cool - an adaptive system where for lower frequencies
you use more audiopixels,
for higher frequencies you use less, and of course the higher the
frequency the more accurate localisation would be.
best, Justin
Justin Bennett
www.justinbennett.nl
http://jubilee-art.org/
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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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TIM BOISSAUD-COOKE
2018-01-22 21:29:08 UTC
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At what point does Ockham's Razor apply?

Sent from my iPad
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1. Re: MEMS speakers (Gary Gallagher)
2. Re: MEMS speakers (Augustine Leudar)
3. Re: MEMS speakers (Charlie Richmond)
4. Re: MEMS speakers (J?rn Nettingsmeier)
5. Re: MEMS speakers (J?rn Nettingsmeier)
6. Re: MEMS speakers (Augustine Leudar)
----------------------------------------------------------------------
Message: 1
Date: Fri, 19 Jan 2018 19:04:12 +0000
Subject: Re: [Sursound] MEMS speakers
Content-Type: text/plain; charset="utf-8"
Wave field synthesis wall paper? How small does an an audio pixel have to
be?
Post by Augustine Leudar
Interesting..... I can think of a lot of applications for these and spatial
audio....
Post by Gary Gallagher
https://hackaday.com/2018/01/16/new-part-day-mems-
loudspeakers/?_utm_source=1-2-2
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------------------------------
Message: 2
Date: Sat, 20 Jan 2018 01:14:23 +0000
Subject: Re: [Sursound] MEMS speakers
Content-Type: text/plain; charset="utf-8"
exactly what I was thinking Gary - except youd need a million channel
interface - there's be other ways though. Basically it would be a good way
of getting 3D audio into peoples homes - as noone can either be bothered to
set up even 4 speakers let alone some fancy atmos setup. So some kind of
wallpaper would possibly work, something that requires almost zero setup
anyway...
Post by Augustine Leudar
Wave field synthesis wall paper? How small does an an audio pixel have to
be?
Post by Gary Gallagher
Interesting..... I can think of a lot of applications for these and
spatial
Post by Gary Gallagher
audio....
Post by Gary Gallagher
https://hackaday.com/2018/01/16/new-part-day-mems-
loudspeakers/?_utm_source=1-2-2
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Post by Gary Gallagher
Post by Gary Gallagher
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Belfast BT88LL
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------------------------------
Message: 3
Date: Fri, 19 Jan 2018 18:03:51 -0800
Subject: Re: [Sursound] MEMS speakers
Content-Type: text/plain; charset="utf-8"
SoundMan-Server is a virtual matrix that has up to 1k discrete inputs and
outputs with dynamic level, eq and delay controls at each crosspoint if
that helps at all.
Charlie
Post by Augustine Leudar
exactly what I was thinking Gary - except youd need a million channel
interface - there's be other ways though. Basically it would be a good way
of getting 3D audio into peoples homes - as noone can either be bothered to
set up even 4 speakers let alone some fancy atmos setup. So some kind of
wallpaper would possibly work, something that requires almost zero setup
anyway...
Post by Gary Gallagher
Wave field synthesis wall paper? How small does an an audio pixel have to
be?
Post by Gary Gallagher
Interesting..... I can think of a lot of applications for these and
spatial
Post by Gary Gallagher
audio....
Post by Gary Gallagher
https://hackaday.com/2018/01/16/new-part-day-mems-
loudspeakers/?_utm_source=1-2-2
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Message: 4
Date: Sat, 20 Jan 2018 13:12:39 +0100
Subject: Re: [Sursound] MEMS speakers
Content-Type: text/plain; charset=utf-8; format=flowed
Post by Augustine Leudar
Wave field synthesis wall paper? How small does an an audio pixel have to
be?
The question is more like "how big can you make it?". An audio "pixel"
of a square millimetre cannot produce meaningful audio frequencies if
suspended in mid-air without a baffle, you would have to get somewhat
close to the wavelength. So no million-channel audio interfaces either,
I guess the approach would be to use lots of those pixels in unison. How
you ensure good airtight coupling between them is one question, and the
other is how much excursion you can get.
Thiele-Small parameters for silicon cavities, anyone? :-D
It's quite a moonshot actually, and if you start thinking about the
complexities, that carbon nanosheet paper that came from China a few
years back doesn't sound soo far-fetched anymore, where people were
producing sound by heating surfaces with an extremely good heat
conductivity (so its thermal cycles can be at audio frequencies).
Problem there is 100% k2, as it's effectively a half-wave rectifier...
--
J?rn Nettingsmeier
De Rijpgracht 8, 1055VR Amsterdam, Nederland
Tel. +49 177 7937487
Meister f?r Veranstaltungstechnik (B?hne/Studio), Tonmeister VDT
http://stackingdwarves.net
------------------------------
Message: 5
Date: Sat, 20 Jan 2018 13:14:30 +0100
Subject: Re: [Sursound] MEMS speakers
Content-Type: text/plain; charset=utf-8; format=flowed
Post by Augustine Leudar
Post by Gary Gallagher
Wave field synthesis wall paper? How small does an an audio pixel have to
be?
The question is more like "how big can you make it?". An audio "pixel"
of a square millimetre cannot produce meaningful audio frequencies if
suspended in mid-air without a baffle, you would have to get somewhat
close to the wavelength. So no million-channel audio interfaces either,
I guess the approach would be to use lots of those pixels in unison. How
you ensure good airtight coupling between them is one question, and the
other is how much excursion you can get.
Thiele-Small parameters for silicon cavities, anyone? :-D
It's quite a moonshot actually, and if you start thinking about the
complexities, that carbon nanosheet paper that came from China a few
years back doesn't sound soo far-fetched anymore, where people were
producing sound by heating surfaces with an extremely good heat
conductivity (so its thermal cycles can be at audio frequencies).
Problem there is 100% k2, as it's effectively a half-wave rectifier...
Hit send too fast - meant to add that Fraunhofer in Germany has been
doing research on MEMS drivers for in-ear systems for a while, and they
combine the output of a cascade of laterally compressed nanomechanical
cavities in series to drive the eardrum.
--
J?rn Nettingsmeier
De Rijpgracht 8, 1055VR Amsterdam, Nederland
Tel. +49 177 7937487
Meister f?r Veranstaltungstechnik (B?hne/Studio), Tonmeister VDT
http://stackingdwarves.net
------------------------------
Message: 6
Date: Sat, 20 Jan 2018 15:36:43 +0000
Subject: Re: [Sursound] MEMS speakers
Content-Type: text/plain; charset="utf-8"
Youd have to have "patches" of mems working in unison I guess to get the
lower frequencies . You might be abvle to do soemthing interesting with the
ultrasonic methods the directional "zone" speakers use as well....
On 20 January 2018 at 12:12, J?rn Nettingsmeier <
Post by Augustine Leudar
Post by Gary Gallagher
Wave field synthesis wall paper? How small does an an audio pixel have to
be?
The question is more like "how big can you make it?". An audio "pixel" of
a square millimetre cannot produce meaningful audio frequencies if
suspended in mid-air without a baffle, you would have to get somewhat close
to the wavelength. So no million-channel audio interfaces either, I guess
the approach would be to use lots of those pixels in unison. How you ensure
good airtight coupling between them is one question, and the other is how
much excursion you can get.
Thiele-Small parameters for silicon cavities, anyone? :-D
It's quite a moonshot actually, and if you start thinking about the
complexities, that carbon nanosheet paper that came from China a few years
back doesn't sound soo far-fetched anymore, where people were producing
sound by heating surfaces with an extremely good heat conductivity (so its
thermal cycles can be at audio frequencies). Problem there is 100% k2, as
it's effectively a half-wave rectifier...
--
J?rn Nettingsmeier
De Rijpgracht 8, 1055VR Amsterdam, Nederland
Tel. +49 177 7937487
Meister f?r Veranstaltungstechnik (B?hne/Studio), Tonmeister VDT
http://stackingdwarves.net
_______________________________________________
Sursound mailing list
https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here,
edit account or options, view archives and so on.
--
Dr. Augustine Leudar
Artistic Director Magik Door LTD
Company Number : NI635217
Registered 63 Ballycoan rd,
Belfast BT88LL
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End of Sursound Digest, Vol 114, Issue 4
****************************************
Paul Doornbusch
2018-01-22 21:34:39 UTC
Permalink
Raw Message
Hi Tim,

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Post by TIM BOISSAUD-COOKE
At what point does Ockham's Razor apply?
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1. Re: MEMS speakers (Gary Gallagher)
2. Re: MEMS speakers (Augustine Leudar)
3. Re: MEMS speakers (Charlie Richmond)
4. Re: MEMS speakers (J?rn Nettingsmeier)
5. Re: MEMS speakers (J?rn Nettingsmeier)
6. Re: MEMS speakers (Augustine Leudar)
----------------------------------------------------------------------
Message: 1
Date: Fri, 19 Jan 2018 19:04:12 +0000
Subject: Re: [Sursound] MEMS speakers
Content-Type: text/plain; charset="utf-8"
Wave field synthesis wall paper? How small does an an audio pixel have to
be?
Post by Augustine Leudar
Interesting..... I can think of a lot of applications for these and spatial
audio....
Post by Gary Gallagher
https://hackaday.com/2018/01/16/new-part-day-mems-
loudspeakers/?_utm_source=1-2-2
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Artistic Director Magik Door LTD
Company Number : NI635217
Registered 63 Ballycoan rd,
Belfast BT88LL
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Message: 2
Date: Sat, 20 Jan 2018 01:14:23 +0000
Subject: Re: [Sursound] MEMS speakers
Content-Type: text/plain; charset="utf-8"
exactly what I was thinking Gary - except youd need a million channel
interface - there's be other ways though. Basically it would be a good way
of getting 3D audio into peoples homes - as noone can either be bothered to
set up even 4 speakers let alone some fancy atmos setup. So some kind of
wallpaper would possibly work, something that requires almost zero setup
anyway...
Post by Augustine Leudar
Wave field synthesis wall paper? How small does an an audio pixel have to
be?
Post by Gary Gallagher
Interesting..... I can think of a lot of applications for these and
spatial
Post by Gary Gallagher
audio....
Post by Gary Gallagher
https://hackaday.com/2018/01/16/new-part-day-mems-
loudspeakers/?_utm_source=1-2-2
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Post by Gary Gallagher
Post by Gary Gallagher
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--
Dr. Augustine Leudar
Artistic Director Magik Door LTD
Company Number : NI635217
Registered 63 Ballycoan rd,
Belfast BT88LL
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Registered 63 Ballycoan rd,
Belfast BT88LL
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Message: 3
Date: Fri, 19 Jan 2018 18:03:51 -0800
Subject: Re: [Sursound] MEMS speakers
Content-Type: text/plain; charset="utf-8"
SoundMan-Server is a virtual matrix that has up to 1k discrete inputs and
outputs with dynamic level, eq and delay controls at each crosspoint if
that helps at all.
Charlie
Post by Augustine Leudar
exactly what I was thinking Gary - except youd need a million channel
interface - there's be other ways though. Basically it would be a good way
of getting 3D audio into peoples homes - as noone can either be bothered to
set up even 4 speakers let alone some fancy atmos setup. So some kind of
wallpaper would possibly work, something that requires almost zero setup
anyway...
Post by Gary Gallagher
Wave field synthesis wall paper? How small does an an audio pixel have to
be?
Post by Gary Gallagher
Interesting..... I can think of a lot of applications for these and
spatial
Post by Gary Gallagher
audio....
Post by Gary Gallagher
https://hackaday.com/2018/01/16/new-part-day-mems-
loudspeakers/?_utm_source=1-2-2
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Post by Gary Gallagher
Post by Gary Gallagher
edit account or options, view archives and so on.
--
Dr. Augustine Leudar
Artistic Director Magik Door LTD
Company Number : NI635217
Registered 63 Ballycoan rd,
Belfast BT88LL
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Registered 63 Ballycoan rd,
Belfast BT88LL
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* Charlie Richmond - http://www.RichmondSoundDesign.com
<http://www.richmondsounddesign.com/>
* Viber: +16047159441 Skype, LinkedIn & Twitter: charlierichmond
* facebook: charlie.richmond
* facebook.com/pages/Richmond-Sound-Design-Ltd/130195960832
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* google.com/+CharlieRichmond google.com/+Richmondsounddesign
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------------------------------
Message: 4
Date: Sat, 20 Jan 2018 13:12:39 +0100
Subject: Re: [Sursound] MEMS speakers
Content-Type: text/plain; charset=utf-8; format=flowed
Post by Augustine Leudar
Wave field synthesis wall paper? How small does an an audio pixel have to
be?
The question is more like "how big can you make it?". An audio "pixel"
of a square millimetre cannot produce meaningful audio frequencies if
suspended in mid-air without a baffle, you would have to get somewhat
close to the wavelength. So no million-channel audio interfaces either,
I guess the approach would be to use lots of those pixels in unison. How
you ensure good airtight coupling between them is one question, and the
other is how much excursion you can get.
Thiele-Small parameters for silicon cavities, anyone? :-D
It's quite a moonshot actually, and if you start thinking about the
complexities, that carbon nanosheet paper that came from China a few
years back doesn't sound soo far-fetched anymore, where people were
producing sound by heating surfaces with an extremely good heat
conductivity (so its thermal cycles can be at audio frequencies).
Problem there is 100% k2, as it's effectively a half-wave rectifier...
--
J?rn Nettingsmeier
De Rijpgracht 8, 1055VR Amsterdam, Nederland
Tel. +49 177 7937487
Meister f?r Veranstaltungstechnik (B?hne/Studio), Tonmeister VDT
http://stackingdwarves.net
------------------------------
Message: 5
Date: Sat, 20 Jan 2018 13:14:30 +0100
Subject: Re: [Sursound] MEMS speakers
Content-Type: text/plain; charset=utf-8; format=flowed
Post by Augustine Leudar
Post by Gary Gallagher
Wave field synthesis wall paper? How small does an an audio pixel have to
be?
The question is more like "how big can you make it?". An audio "pixel"
of a square millimetre cannot produce meaningful audio frequencies if
suspended in mid-air without a baffle, you would have to get somewhat
close to the wavelength. So no million-channel audio interfaces either,
I guess the approach would be to use lots of those pixels in unison. How
you ensure good airtight coupling between them is one question, and the
other is how much excursion you can get.
Thiele-Small parameters for silicon cavities, anyone? :-D
It's quite a moonshot actually, and if you start thinking about the
complexities, that carbon nanosheet paper that came from China a few
years back doesn't sound soo far-fetched anymore, where people were
producing sound by heating surfaces with an extremely good heat
conductivity (so its thermal cycles can be at audio frequencies).
Problem there is 100% k2, as it's effectively a half-wave rectifier...
Hit send too fast - meant to add that Fraunhofer in Germany has been
doing research on MEMS drivers for in-ear systems for a while, and they
combine the output of a cascade of laterally compressed nanomechanical
cavities in series to drive the eardrum.
--
J?rn Nettingsmeier
De Rijpgracht 8, 1055VR Amsterdam, Nederland
Tel. +49 177 7937487
Meister f?r Veranstaltungstechnik (B?hne/Studio), Tonmeister VDT
http://stackingdwarves.net
------------------------------
Message: 6
Date: Sat, 20 Jan 2018 15:36:43 +0000
Subject: Re: [Sursound] MEMS speakers
Content-Type: text/plain; charset="utf-8"
Youd have to have "patches" of mems working in unison I guess to get the
lower frequencies . You might be abvle to do soemthing interesting with the
ultrasonic methods the directional "zone" speakers use as well....
On 20 January 2018 at 12:12, J?rn Nettingsmeier <
Post by Augustine Leudar
Post by Gary Gallagher
Wave field synthesis wall paper? How small does an an audio pixel have to
be?
The question is more like "how big can you make it?". An audio "pixel" of
a square millimetre cannot produce meaningful audio frequencies if
suspended in mid-air without a baffle, you would have to get somewhat close
to the wavelength. So no million-channel audio interfaces either, I guess
the approach would be to use lots of those pixels in unison. How you ensure
good airtight coupling between them is one question, and the other is how
much excursion you can get.
Thiele-Small parameters for silicon cavities, anyone? :-D
It's quite a moonshot actually, and if you start thinking about the
complexities, that carbon nanosheet paper that came from China a few years
back doesn't sound soo far-fetched anymore, where people were producing
sound by heating surfaces with an extremely good heat conductivity (so its
thermal cycles can be at audio frequencies). Problem there is 100% k2, as
it's effectively a half-wave rectifier...
--
J?rn Nettingsmeier
De Rijpgracht 8, 1055VR Amsterdam, Nederland
Tel. +49 177 7937487
Meister f?r Veranstaltungstechnik (B?hne/Studio), Tonmeister VDT
http://stackingdwarves.net
_______________________________________________
Sursound mailing list
https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here,
edit account or options, view archives and so on.
--
Dr. Augustine Leudar
Artistic Director Magik Door LTD
Company Number : NI635217
Registered 63 Ballycoan rd,
Belfast BT88LL
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