Home Digital Drive

Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it.

Re: Yep

That wasn't the article I was thinking about, but it's a good article nevertheless.

The interesting thing about logic induced modulation is that it explains why there is jitter coming out of an optical drive even though as some people love to point out there's a RAM buffer in there.

First of all, the memory is probably clocked at the same rate as the chip controlling the motor and laser, which is usually not a multiple of the audio clock. The clock source itself is probably synthesized through PLL. It's also likely to share power with the mechanical components of the drive. Result: jitter.

It also explains why a PC is typically not a good place to do audio. It's possible to get good audio (and let's face most studios these days use PCs for DAWs) but some care needs to be taken.

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  • Re: Yep - Christine Tham 14:17:23 03/04/07 (0)

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