As a follow up to the postings of Dave Malham and Sampo Syreeni I want to put in a bit of information that Google have found for me during a number of hours.
As far as I can find I2S based DA audio interface is the way to go. Until very recently most if not all DIY interfaces have been done for just 2 channels with the exception below that I found today. As far as I can find software examples for I2S drivers seems to be simple to find :-) http://en.wikipedia.org/wiki/I%C2%B2S Multichannel asynchronous USB to I2S audio interface delivering 384 kHz 32bit low-jitter bit-perfect performance - 8 Channels Could this concept be expanded to 16 or more channels? Eliminate the intermediate USB interface and instead directly connect to an ARM processor http://exadevices.com/exaU2I/Overview.aspx Or follow davids idea and change interface to Ethernet and synchronize several 8 channel devices or expand the device to at least 16 channels - I will not user mot than 16 loudspeakers I thing. Here is something with 8 channel I2S DAC but totally wrong pricelevel http://www.twistedpearaudio.com/digital/buffalo8.aspx Use this instead to get multiple of 8 output channels for low cost but good enough? http://www.wolfsonmicro.com/products/dacs/WM8768/ If we want to go directly from I2S to Loudspeakers. TAS5715PHP 25-W Stereo I2S Audio Amplifier With Speaker EQ, 2-Band DRC, And DC Protection The TAS5715 is a 25-W, efficient, digital audio-power amplifier for driving stereo bridge-tied speakers. One serial data http://www.digchip.com/datasheets/parts/datasheet/477/TAS5715.php A software component http://github.xcore.com/sc_i2s/summary.html So there are several design decisions to make, I actually belive the ideal "product" for me would be a 16 channel dac with Ethernet input and unbalanced outouts on a pin row to take 36 or 50 pin flatcable to for example a centronics panel connector, or interface to a circuit board with RCA connectors for power amp connectivity. Combine this with ambdec and a streaming protocol would be good. Just a SD card bformat playing ARM singlecard computer would be OK :-) Best Regards Bo-Erik Sandholm _______________________________________________ Sursound mailing list [email protected] https://mail.music.vt.edu/mailman/listinfo/sursound
