On Mon, Nov 09, 2009 at 01:42:00AM +0100, Karl Hammar wrote: > Folderol: > > On Sun, 8 Nov 2009 16:53:31 +0100 (CET) > > karl@xxxxxxxxxxx (Karl Hammar) wrote: > ... > > > Would a network connection solve that problem? > > > In that case the DACs and ADCs could reside on an embedded computer > > > and stream the sound data to/from the pc. And one could envision > > > such little things near each mic and ethernet cables or possible wifi > > > to the control room. > ... > > Ethernet looks interesting, and I know there is stuff out there, but > > have no idea what latency and timing issues there may be. I would > > imagine syncing multiple 'drops' to a stable clock might be problematic. > > Lets say we have pc <> switch <> lots of network boards for a single mic > PC could broadcast the clock to all micboards and the would hopefully > arrive without noticeable skew or jitter. And the micboards could > answer with that timestamp and the converted value. In this case > the PC requests each sample one at a time from all micboards. > > Would that be good scheme? > > A simple ping here, has a rund trip time of 0.25 to 0.8 ms depending > on end equipment. > That's a fascinating idea. Instead of messing with USB2 protocols, design a board that attaches a ADC/DAC to a microcontroller and shoves the raw floats in and out over... Gigabit Ethernet??! I don't know if any of the cheap microcontrollers out there-- or the free network stacks available for them-- could also handle the speed of a large amount of audio. But the thought of a hardware audio interface that talks NetJACK natively, however, is really intriguing. Use OSC to control the interface.... Hmm. It'd be more than just a native Linux-supported audio interface, it'd be a JACK-specific audio interface. The devil's in the details, though. Which DAC/ADC chip? Which microcontroller? How much RAM? Which network stack? Which preamp circuitry? How many channels? Etc, etc. It's not a trivial project. -ken _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
