Xref: utzoo rec.audio:14373 sci.electronics:7255
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From: spcecdt@ucscb.UCSC.EDU (Space Cadet)
Newsgroups: rec.audio,sci.electronics
Subject: Re: Copy protection bit set on my CD player (digital out).
Message-ID: <330@darkstar.ucsc.edu>
Date: 4 Aug 89 22:34:30 GMT
References: <752@palladium.UUCP>
Sender: usenet@darkstar.ucsc.edu
Reply-To: spcecdt@ucscb.UCSC.EDU.UUCP (Space Cadet)
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Organization: FCIPs (Frivolous CPU Intensive Programs) Ltd.
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In article <752@palladium.UUCP> rsilvers@palladium.UUCP (rsilvers) writes:
>
>   Hi.  I just bought an NAD 5340 CD player with serial digital out.
>I wanted digital out so that when I could afford a DAT unit, I could
>copy my CDs.  Why would I wan't to copy my CDs you ask?  So I can make
>"party" tapes of various songs, and so that I can play them in my car.
>I believe that since DAT tape players are not as shock-sensitive as CD
>players, they will become more popular for automotive use.
>Robert S. Silvers

     Unfortunately, CDs use a sampling frequency that is different
from the one consumer DAT decks record at.  This was intended specifically
to prevent copying of CDs.  DAT decks can play tapes recorded at either
frequency, so they can play prerecorded tapes of the same source used for
CDs, but getting a consumer DAT deck to record at that sampling rate would
involve a *lot* of work.  
     Of course, one must wonder how long it will be before we see a purely
digital sampling rate converter available capable of interpolating samples at
the correct rate from a CD output.  This sampling rate incompatibility copy
protection may stop less determined copiers, but the more determined ones will
*always* find a way...

>Epoch Systems, Inc., 313 Boston Post Rd. West, Marlborough, MA 01752
>...!linus!alliant!palladium!rsilvers -or- ...!harvard!cfisun!palladium!rsilvers
>(508)481-3717

	John DuBois
	spcecdt@ucscb.ucsc.edu
	...!ucbvax!ucscc!ucscb!spcecdt