Re: USB audio, etc.. Re: Re: EgoSys U24

Unorthodox Behaviour wrote:

> This optoplay is based on the chip AKM AK4353, see
> http://www.asahi-kasei.co.jp/akm/usa/product/ak4353/ak4353.html

This is simply a DAC, and a low end one at that.

> Asahi-Kasei seems to produce a wide range of chips
> that might be interesting. Of course I don't expect
> them to have the quality of e.g. a Crystal DSP, but
> they may still be interesting.

TI/Burr Brown, Analog Devices, and others produce similar
DACs.  The issue is you need to feed these DACs bit-serial
16/24/32-bit data synchronized to a frame clock running at
the associated sampling frequency.  

> They produce evaluation boards for all their chips and
> I mailed them asking details on the availability and
> pricing of them. If they send me one for free (many
> chip manufacturers do) then I'll have a first hand
> experience...

I'm afraid the eval board wont give you more than a
convenient way to get serial data into the DAC.  You
still need to have a way to create the audio serial data
and I2C control from a USB isochronous stream.  These are
completely different universes and conversion is non-trivial.

You might investigate Philips and TI for more integrated
USB to audio conversion solutions.

-- 
John Cooper   [email protected]