This is still interesting, I have been thinking about how to implement a 4
channel recorder and in the process I belive my idea might be good enough for a
16 channel player also.
I think we should split the problem in to 2 solutions.
1 The player with support for 16 digital output channels.
2 Digital to analog converter.
And there have to be a media carrier in between.
I see 2 alternatives firewire, usb 2 with Audio Class 2.0 or the oldie ADAT.
- Firewire works, but 8 or 16 channel sound cards are expensive or hard to
DIY.
- getting 16 channels of sound over USB in sync is not easy I think.
- ADAT oldie but goodie if you are content with 48kHz 24 bits, its good enough
for me.
Implement with dual ADAT,
The AL1401 (sender) and AL1402(receiver) +opto modules are now low cost
components.
For Playback 2 ADA8000 could be used for balanced outputs not really high cost
as second hand or even as new,
or we might even build a card with dual adat input to 8 spdif outs in a Xilinx
CPLD if we want to carry digital stereo signals to power amplifiers.
Using modules from
http://opencores.org/project,adat_optical_feed_forward_receiver ,
http://opencores.org/project,aes3rx and
http://opencores.org/project,madi_receiver
Taking ideas from the ADA8000 schematic it should be possible to reimplement an
ADAT 8 or 16 channel ADC with several choices in how to implement the outputs.
I belive it is even possible to build a special version of ADAT ADC that can be
optically chained and extract the wanted channels out of eight in each ADC.
I belive 48 kHz 24 bit is definitely good enough for a player, 16 bits should
also be good enough in praxis.
- Bosse
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Dave Malham
Sent: den 6 juli 2012 09:52
To: Surround Sound discussion group
Subject: Re: [Sursound] preferred (small) linux distro for audio?
Thanks to everyone who has already expressed interest! Definitely looking like
it may be a go on the project. I'll keep sursound informed as I do preliminary
studies this summer.
Dave
On 05/07/2012 22:25, Gerard Lardner wrote:
> +1 here too.
>
> Gerard Lardner
>
> On 05/07/2012 14:41, Hugh Pyle wrote:
>> +1. If you design a BeagleBone cape with 16 channels out (balanced
>> +or
>> not, I don't really mind), or a dedicated system that includes the
>> CPU, I'll want several :-)
>>
>> On Thu, Jul 5, 2012 at 8:16 AM, GP <[email protected]> wrote:
>>> Put me on your pre-order list already Dave! :-).
>>>
>>> Cheers Garth
>>> Sent on the Move
>>>
>>> On 05/07/2012, at 19:48, Dave Malham <[email protected]> wrote:
>>>
>>>> Wow! Fantastic response .. lots to think about. Will let you know how I
>>>> get on. Part of the problem is hardware as I was unable (at the time I got
>>>> this board) to find a case with a HD Audio front panel so it currently
>>>> thinks it's running in AC97 mode, but I'm going to knock something up to
>>>> get round this. In the mean time I'm going to play with the suggestions
>>>> people have made (Puppy is currently booting).
>>>>
>>>> I'm also interested in the paper that Fernando gave us a link to. Although
>>>> I don't want to use the Mamba hardware, I _am_ interested in the
>>>> possibilities for a dedicated multichannel player for installation work
>>>> (another retirement project!) What I'm looking at at present is a
>>>> multichannel dac linked directly (not via USB or owt like that) to an Arm
>>>> processor that'll just play a multichannel file off of a USB stick or SD
>>>> card. For prototyping I'll be using a BeagleBone (as I definitely don't
>>>> want the extra bells and whistles of the BeagleBoard itself) - I'd prefer
>>>> to use the RPi but the chip used (at least, according to the manual)
>>>> appears to have a crippled McASP port that can only handle stereo, whereas
>>>> the ARM on the BeagleBone has a good enough implementation of McASP that
>>>> it can do 16 channels at 48k for definite (EAOE) and probably up to 96k
>>>> without too much trouble. If initial tests prove the concept, I'll look
>>>> KickStarter funding. The idea is to have an absolutely rock solid box that
>>>> just plays stuff without any of the hassles of systems relying on
>>>> computers (ha! That'll be the day)) The most it would have is an on/off
>>>> switch and play controls - but it would output up to 16 channels,
>>>> balanced, 24 bits.
>>>>
>>>> Dave
>>>>
>>>>
>>>> On 05/07/2012 07:50, Fernando Lopez-Lezcano wrote:
>>>>> On 07/04/2012 06:40 PM, Marc Lavallée wrote:
>>>>>> Fernando Lopez-Lezcano<[email protected]> a écrit :
>>>>>>
>>>>>> Single board computers are interesting platforms to create
>>>>>> dedicated ambisonic players.
>>>>> Indeed!
>>>>>
>>>>>> Let us know how the beagle board perform with a port of Planet
>>>>>> CCRMA. ;-)
>>>>> I will, I just have to find the time to test. I'm curious whether a small
>>>>> box like that can drive 1/2 of the Mamba box I was driving from a regular
>>>>> desktop. 32 channel playback through an ethernet port[*]...
>>>>>
>>>>> -- Fernando
>>>>>
>>>>> [*]
>>>>> https://ccrma.stanford.edu/~nando/publications/jack_mamba_lac2012.
>>>>> pdf _______________________________________________
>>>>> Sursound mailing list
>>>>> [email protected]
>>>>> https://mail.music.vt.edu/mailman/listinfo/sursound
>>>> --
>>>> These are my own views and may or may not be shared by my employer
>>>> /*********************************************************************/
>>>> /* Dave Malham http://music.york.ac.uk/staff/research/dave-malham/ */
>>>> /* Music Research Centre */
>>>> /* Department of Music "http://music.york.ac.uk/"; */
>>>> /* The University of York Phone 01904 322448 */
>>>> /* Heslington Fax 01904 322450 */
>>>> /* York YO10 5DD */
>>>> /* UK 'Ambisonics - Component Imaging for Audio' */
>>>> /* "http://www.york.ac.uk/inst/mustech/3d_audio/"; */
>>>> /******************************************************************
>>>> ***/
>>>>
>>>>
>>>>
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>>> _______________________________________________
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>> _______________________________________________
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>>
>>
>
>
> _______________________________________________
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> [email protected]
> https://mail.music.vt.edu/mailman/listinfo/sursound
--
These are my own views and may or may not be shared by my employer
/*********************************************************************/
/* Dave Malham http://music.york.ac.uk/staff/research/dave-malham/ */
/* Music Research Centre */
/* Department of Music "http://music.york.ac.uk/"; */
/* The University of York Phone 01904 322448 */
/* Heslington Fax 01904 322450 */
/* York YO10 5DD */
/* UK 'Ambisonics - Component Imaging for Audio' */
/* "http://www.york.ac.uk/inst/mustech/3d_audio/"; */
/*********************************************************************/
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