Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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Re: Prop speed is ~ 1/2 C.

Posted by rick_m (A) on April 30, 2007 at 00:23:01

In Reply to: Re: Prop speed is ~ 1/2 C. posted by pkell44 on April 29, 2007 at 18:21:38:

Well, there are a few vines hanging around, but it's not quite a jungle. The saving grace is the systems are clocked. Let's say that you have a DAC, overtly all the data line(s) need to do is settle within the voltage range for their logic states for the setup time before the clock hits to latch in the correct code. But secondary effects can rear their ugly heads sometimes such as noise from data transitions showing up on the DAC outputs due to internal crosstalk.

However it's usually the clock lines that causes problems. Minor variations in data signal voltages caused by crosstalk or reflections are simply ignored as long as the signal stays within it's rather large window. The same variations in the clock signal however cause timing jitter. This can be especially bad if the coupled energy is correlated to the amplitude of the signal as it produces nasty FM artifacts.

So if you decided to try to improve you player by tweaking the signal paths, you may want to concentrate your efforts on the clock lines.

With respect to CD players in general, I think that nowadays the factors that affect the sound are quite well understood. Of course that doesn't mean that all players fully optimized...

Rick

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