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Re: Any 12-bit / 108MHz DVD Players ?

Posted by Homer (A) on April 30, 2002 at 22:02:07

In Reply to: Any 12-bit / 108MHz DVD Players ? posted by vulcanman on April 30, 2002 at 20:19:28:

Um, you know that DVD is 8-bit / 13.5 MSamples/sec, right? Also, consider that higher frequency DACs tend to have lower performance (e.g. more distortion & noise) and run hotter. I'm no expert on DACs, but I think the only reason to use more than 2x oversampling (i.e. 27 MHz for interlaced, and 54 MHz for progressive) is if you want to cut corners on your analog filters.

There's simply no reason to use 12-bit DACs, with 8-bit data. Really, anything more than an ultra-linear 9-bit DAC shouldn't get you any more performance. Specs like that are just marketing games. The real bottlenecks are elsewhere in the player, and elsewhere in your system.

Also, keep in mind that we're talking about DVD, which compresses a 126 Mbit/sec stream into < 10 Mbits/sec (often, much lower). The kind of performance you're talking about not only exceeds that of the film and studio equipment used to produce and master the source, but IT THEN GETS COMPRESSED.

And, in many cases, the video might actually get digitized by an 8 to 10 bit, 27 or 54 MHz ADC, in the TV, and then re-converted via an 8 to 10 bit, 27 or 54 MHz DAC.

The real solution is a digital interconnect. That'll be much more exciting news, when such players start to hit the streets.

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