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From: rabin@cs.qmc.ac.uk (Rabin Ezra)
Newsgroups: rec.audio,sci.electronics
Subject: Re: Copy protection bit set on my CD player (digital out).
Message-ID: <1183@sequent.cs.qmc.ac.uk>
Date: 9 Aug 89 17:54:01 GMT
References: <752@palladium.UUCP>
Reply-To: rabin@cs.qmc.ac.uk (Rabin Ezra)
Organization: Computer Science Dept, Queen Mary College, University of London, UK.
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In article <752@palladium.UUCP> rsilvers@palladium.UUCP (rsilvers) writes:
>   This is my question.  It says in my documentation that the copy
>protection bit is always set on my digital out, even if the CD I am
>playing does not have it set.  This is not good.  Does it seem possible
>that the engineers that designed this made this defeatable?  Perhaps
>there is a diode I can clip, etc.  I know of scanners that cannot
>recieve cellular phone, until you clip a diode.  Any thoughts?  Maybe
>the DAT recorders will have an unadvertised "feature" like this.
No. (It is not easily defeatable, or someone has egg on their face)
No. (DAT recorders will probably echo the bit on the tape)
You would probably need to build a little box to read the data
stream, knock out the bit, and then forward it. While you were
at it, you could also do a digital domain conversion to 48kHz
sampling rate as most domestic DAT players, though they will
play at 32/44.1/48 will only digitally accept 32 and 48. The
other option is to buy one of the super expensive DAT recorders
that have been touted for profesional use. These don't have the
limitation, probably as one of the proposed uses is for
recording the mixdown for CD masters. Still, what is wrong with
an analogue copy, if this is for in car use. The artifacts
introduced by 48k sampling of the 44.1 signal (Which should be
clean of any conversion nosie before it gets out the player)
will be so minute that I doubt that you could detect them in a
really good home setup, let alone the noisy environment of a
car.
Happy listening,

-- 
Rabin Ezra                   UUCP:  rabin@qmc-cs.UUCP
PhD Student,                 JANET: rabin@uk.ac.qmc.cs
Dept of Computer Science,    ARPA:  rabin@cs.qmc.ac.uk
Queen Mary College,                 <If the gateway bounces try :
Mile End Road,                       rabin%cs.qmc.ac.uk@cunyvm.cuny.edu >
London E1 4NS.
U.K.