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Re: Core audio what.......

Posted by Gordon Rankin (M) on April 18, 2007 at 14:35:36

In Reply to: Re: Core audio what....... posted by KeithC on April 18, 2007 at 14:21:03:

Keith,

Do remember that with the USB driver does change the characteristics of the stream to match the enumeration of the USB device. In most cases this means clipping the 32 bits to whatever the enumeration is set too 8, 16, 18, 20, 24 or 32. The enumeration cannot be overridden. You set the device type (USB Audio 1.1 etc) the output width (bit size), max buffer length per packet and the rates you support.

Basically my setup is simple. I plug in one of my USB DAC's were I programed the USB controller as above. My USB analyzer is connected in line and my DSO is connected to the DAC. With iTunes or what ever on the mac, sometimes Faber Audio Suites test or on the PC with Dr. Jordan or my Prism dScope III and test the unit.

I have never had a USB device on a mac come up with anything other than 44.1K.

Thanks
Gordon

J. Gordon Rankin

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