> So the thing about the 4 DACs is a patent owned by Wadia. It's in their > 9xx series devices. What they teach is to have 4 DAC chips per > differential > half of a balanced signal - so that's 8 DAC chips per audio channel; a > stereo > pair has 16 DAC chips. The DAC chips are all connected at their current > > outputs, so the output current is 4x a single DAC chip and the I/V > converter > then has to take this into account - simple enough. Now the trick is > that since there are 4 DAC chips in parallel, you don't fire off > samples > to all 4 of them at the same time, you fire off a sample to DAC0 at > phase 0, > then you fire off a sample to DAC1 at 90 degrees, etc. Of course you've > already upsampled to at least a factor of 4 and dithered and...... to > obtain 4 different output streams per channel. If you're really good I > guess > you even correlate the dither between + and - of a phase / channel so > that > the dithering is differentially rejected. Shoot, maybe that's a patent > in > its own right somewhere. Maybe Wadia has that one too.
impressively complicated! -- seanadams ------------------------------------------------------------------------ seanadams's Profile: http://forums.slimdevices.com/member.php?userid=3 View this thread: http://forums.slimdevices.com/showthread.php?t=62747 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
