Computer Audio Asylum

Posted by Gordon Rankin (M) on December 22, 2008 at 07:47:41

In Reply to: RE: My USB DAC research and some questions... posted by AbeCollins on December 21, 2008 at 17:55:27

Abe,

Basically there are two types, well three types of USB DACS.

1) Adaptive 16 bit units that use the Cmedia or TI based chip sets. These are not variable and usually support 32k, 44.1k and 48k.

2) Adaptive 24 bit dacs that use either the Centrance or their own code and an intelligent programable design (TAS1020 or other USB Audio Controller). These include the Benchmark, the newer BelCanto, PS Audio and Emperical.

Adaptive means the computer controls the USB receiver Audio clock and can change that at a rate of every 1ms which will inject jitter into the system. All of the above products have to incorporate some kind of jitter rejection beit upsampling or reclocking.

3) Asynchronous 24 bit dacs which I make and others that control the clock internally and tell the PC to send data in a kind of flow control method that reduces the injected jitter to a very low amount.

The difference between the 16 and 24 bit issue is where do you want to be in the future. Do you want to rip DVD Audio disks or download 24/96 capable music?

Others feel the 24 bit dacs just seem better sounding and if done correctly I would agree with that.

Thanks
Gordon
J. Gordon Rankin

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