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The merit of sending 48 kHz sampling frequency to usb dacs (???)


Mr.C
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Here's the theory based on my very limited knowledge of the way usb works. See below quote

 

{"In Adaptive mode the computer controls the audio transfer rate, and the USB device has to follow along updating the Master Clock (MCLK) every one millisecond. The USB bus runs at 12MHz, which is unrelated to the audio sample rate of any digital audio format (i.e. 44.1K requires a MCLK = 11.2896MHz). Therefore Adaptive Mode USB DACs must derive the critical master audio clock by use of a complex Frequency Synthesizer. Since the computer is handling many tasks at once, the timing of the USB audio transfers has variations. This leads to jitter in the derived clock, which means you are not getting the maximum sonic potential available from computer-based audio." (Adaptive USB description courtesy of Wavelength Audio)} -from the Computeraudiophile Proton dac review

 

So if the usb bus runs at 12Mhz and 48 is much easier to get from 12 than 44.1 is, then a usb receiver should have way less trouble with 48 kHz sampling rate right??? Of course this would mean either converting all redbook material to 48 or 96 kHz via Izotope or something similar, or doing it on the fly.

 

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