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timing

The cd clocking system was essentially mechanical in that the clock timing accuracy was based on the accuracy of the signal from the spinning disc. This gave rise to the overbuilt drives like the TEAC VRDS and the Accuphase/ Sony units. The stream from the laser read was the clock timing, so the speed of the disc and other mechanical considerations, like vibration truly mattered. A traditional cd system had to start at one speed (500rpm), then slow down as it played from the center radially outward to the outside edge (250rpm) in order to maintain a constant data rate. It was a complicated way to clock a signal and was completely dependent on the quality and speed accuracy of the motors, rational speed control circuits and the sleds. Its a miracle that it ever even worked well, frankly.

Modern cd transports use computer data drives that are clock-independent from the signal data stream. Instead, data is read out in chunks into a large data buffer, then clocked out in a stream by a dedicated circuit which then provides the stream clock basis, much like the Genesis digital lens. These systems are significantly more accurate and lower in timing jitter mostly due to the advancement of techniques and mechanical independence from the cd medium, better clock crystals and significantly improved digital implementations.


Edits: 03/20/21 03/20/21
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