Computer Audio Asylum

RE: USB audio interface modes-- litte more info.

66.161.253.68

In Reply to: RE: USB audio interface modes posted by John Swenson on May 27, 2007 at 19:47:50

John,

Well done... but I am pretty sure SYNC can do 44.1 as the new Benchmark uses SYNC mode. They of course run this into an upsampler that will remove some of the jitter.

But John remember there is no jitter in USB Audio. This is because there is no clock riding the wave of the data. The only jitter in USB is intrinsic jitter caused by the interface, PLL and other bs associated with the receiver part.

Also ASYNC can run off of an internal clock but then again the derivation is poorly done and jitter will increase extensively. As John pointed out and something I am working on now is that you can run a fixed low jitter external clock into the TAS1020 that will be used for all the Audio DAC communications.

The one thing nice about Adaptive and say the TAS1020 is that the PLL is soft coded so since you have a rather large buffer you can string out the PLL into slow changes which make it work much better than the fixed based code alternatives.

Thanks
Gordon
J. Gordon Rankin

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