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RedGTiVR6 · 12-28-2007, 09:40 PM

Quote: Originally Posted by durwood

PCM lacks clocking? Did he go into detail? Without digging to far into it, PCM or Pulse Code Modulation has to be clocked somehow. Without PCM every single CD would be useless.

http://en.wikipedia.org/wiki/Pulse-code_modulation

Quote: Originally Posted by linked Wiki article

In real systems, such a device is commonly implemented on a single integrated circuit that lacks only the clock necessary for sampling, and is generally referred to as an ADC (Analog-to-Digital converter)

From what I'm gathering PCM is the data its self.

Sitting here talking to Monte the best comparison I can come up with is this:

The clock is what actually makes PCM useful. Much like having lines of code that are uncompiled. Just because the lines of code are uncompiled doesn't mean that they are not lines of code, it just means that they don't have a useful meaning just yet. In other words, PCM data without a clock, is just PCM data...it's data that has not yet been utilized.

If the PCM protocol were to include clocking, then wouldn't it have to specify the clock timing as well? Then wouldn't that narrow down the purpose of PCM and it's protocol and make it entirely too specific for general use? Perhaps I'm getting way too ahead of myself...lol

Another comparison...Cat5 cable is designated Cat5 by a standard (protocol). A piece of Cat5 cable cannot be designated as Cat5 without being able to transfer at least X amount of data a second. So in order to specify clocking in with the PCM protocol, wouldn't you really need to specify the clock speed as well for it to be a legitimate protocol?

Quote: Originally Posted by durwood

Found a few links discussing improvements to the CD. They may or not be relevant, but if you look at some of Werewolf's posts, he gives light to what maybe to look into.

http://forum.elitecaraudio.com/showt...hreadid=126052
http://forum.elitecaraudio.com/showt...hreadid=126082

I'm reading through these now! Probably going to take me a bit though...hehe

btw - here's the thread I have going on Stereophile: http://forum.stereophile.com/forum/s...ge=0#Post32327

12-28-2007, 09:40 PM	#355
RedGTiVR6 _ RedGTiVR6's CarPC Specs Join Date: Mar 2004 Location: Little Elm, Texas Vehicle: VW GTi VR6 / Ducati 900 SS & S4R / Dakota R/T Supercharged Posts: 13,289 My Photos: ()	Quote: Originally Posted by durwood PCM lacks clocking? Did he go into detail? Without digging to far into it, PCM or Pulse Code Modulation has to be clocked somehow. Without PCM every single CD would be useless. http://en.wikipedia.org/wiki/Pulse-code_modulation Quote: Originally Posted by linked Wiki article In real systems, such a device is commonly implemented on a single integrated circuit that lacks only the clock necessary for sampling, and is generally referred to as an ADC (Analog-to-Digital converter) From what I'm gathering PCM is the data its self. Sitting here talking to Monte the best comparison I can come up with is this: The clock is what actually makes PCM useful. Much like having lines of code that are uncompiled. Just because the lines of code are uncompiled doesn't mean that they are not lines of code, it just means that they don't have a useful meaning just yet. In other words, PCM data without a clock, is just PCM data...it's data that has not yet been utilized. If the PCM protocol were to include clocking, then wouldn't it have to specify the clock timing as well? Then wouldn't that narrow down the purpose of PCM and it's protocol and make it entirely too specific for general use? Perhaps I'm getting way too ahead of myself...lol Another comparison...Cat5 cable is designated Cat5 by a standard (protocol). A piece of Cat5 cable cannot be designated as Cat5 without being able to transfer at least X amount of data a second. So in order to specify clocking in with the PCM protocol, wouldn't you really need to specify the clock speed as well for it to be a legitimate protocol? Quote: Originally Posted by durwood Found a few links discussing improvements to the CD. They may or not be relevant, but if you look at some of Werewolf's posts, he gives light to what maybe to look into. http://forum.elitecaraudio.com/showt...hreadid=126052 http://forum.elitecaraudio.com/showt...hreadid=126082 I'm reading through these now! Probably going to take me a bit though...hehe btw - here's the thread I have going on Stereophile: http://forum.stereophile.com/forum/s...ge=0#Post32327 __________________ Jan Bennett FS: VW MKIV Bezel for 8" Lilliput - 95% Finished PLEASE do NOT PM/Email/IM me asking me to spoon feed you. Please post on the forums! Chances are, someone else has or will have the same questions.