A New Audio Project: Jack working with Epiphany

[AndyC]

Hi Again,

I built Jack 2 and it is now working

Cheers

Andy

[Moonsplice]

Wow! 384khz. This is impressive and I will definitely be using this. Would jack input work in this manner. The ultimate goal I think is to be scalable. With the pieces here I feel it should be possible to use jack and ardour with the epiphany to make sync up using something resembling SMPTE time code and multitrack recording. if anything breaks on multitrack audio recording interfaces that exist today you usually have to replace the whole interface not to mention USB 2.0 bottlenecks in speed being reached pretty quickly for most of these and you are at the mercy of proprietary software just to get it to work. The parallella could be used to replace the way digital audio interfaces are currently being sold.

If there were a need for another board to the parallella I would suggest optical spdif in/out.

I also read http://www.erlang-embedded.com/wp-conte ... -jul03.pdf and was thinking this could work in capturing multiple audio inputs using jack just to record simultaneously. I think working with the read write speed of the sdcard will also be a challenge.

[theover]

In another thread I wrote about the course outline of getting Jack to work, but only by using a non-Alsa synchronization, together with a "alsa_out" tool to connect with various USB AD/DA interfaces. Alsa, I've been able to use the standard Linux tools in net-jack to connect 192kHz/32bit/ch stereo audio to other Linux machines successfully, also using a 32bit 384 kHz sampling frequency USB DA converter. It's no problem connecting 20 audio channels over USB 2.0 (It's maximum of 50Mega Byte per second is quite sufficient), but the drivers for the audio interface must be there, the synchronization scheme must be right, and there's an amount of latency, I'd like to prevent by connecting the converters to the FPGA.

I had problems with building jack out-of -the-box, maybe it's better now, but a "how-to"would be decent!

I'm more interested in connecting the Epiphany and the FPGA in the audio path, to compute short-length filters with interactions, that do no work as fast on Intels, I can deal with the converters, it would just be nice to have an AD converter, lightning fast keyboard scan, control voltage input and audio outputs that work with a very high sampling frequency and a very very short latency, of say a couple of samples..

T.V.