2011/10/20 Charles Henry :
> ... feedback for a project, namely building an
Great project !
Maybe try some fund-raising ?
Now, say thanks to those xmos people, they have a
whole reference design ready, inclusive buyable prototype:
Note: This is based on xmos technology, XC - a C like language, that
allows implicit parallel programming.
I heard USB-Audio-Class-2.0 is already supported by ALSA (driver architecture),
thus this device might work OOTB or with very little effort on linux.
In the following, some of my ideas:
You could take it as base,
- modularize it further
- or add some missing components,
- make IOs balanced,
- add ADAT
- add AES3, (AES/EBU)
- add AES10 (MADI)
- add AVB
- support MIDI IO
- Allow the synchronization of two or more cards, to allow more than 6
- Make most of it optional and modular.
- Make 1 (extensible) low-cost + 1 (all-incl.) high-end design
Since most of the modules exist, work is to connect and integrate all of it,
and the design of a beautiful case and package ;)
I would make most of the design digital, with the exception of pre-ADC
(analog limiter, balancer) and post-DAC (amplifier, balancer) stages.
You would end with about these modular stages:
- analog inputs ADC_01 ... ADC_XX
- ADCs would deliver I2S streams, send to a mixer (fpga ? or xmos uC)
, or directly to output modules.
- digital IO SPDIF
- digital IO ADAT
- digital IO AES3
- digital IO AVB
- digital IO USB 2.0
- digital IO IEEE 1394 (maybe)
- digital word clock (75Ω BNC)
- analog outputs DAC_01 .. DAC_XX, would receive digital I2S streams
- controler , routing-, configuration- and switching module
Digital INs would be routed to the mixer stage.
Digital OUTs, could optionally be routed back to the mixer stage,
maybe with a feedback-loop detection, to prevent damage of ear and device.
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