home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: rec.audio
- Path: sparky!uunet!gatech!emory!wupost!cs.utexas.edu!torn!nott!dgbt!ted
- From: ted@dgbt.doc.ca (Ted Grusec)
- Subject: Re: DCC -- JUST SAY NO! (was: The end of cassettes,
- Message-ID: <1992Nov19.183425.16066@dgbt.doc.ca>
- Organization: The Communications Research Centre
- References: <BxKt78.2Hu@unix.portal.com> <1992Nov19.015656.10054@adobe.com> <27682@oasys.dt.navy.mil>
- Date: Thu, 19 Nov 92 18:34:25 GMT
- Lines: 28
-
- In article <27682@oasys.dt.navy.mil> curt@oasys.dt.navy.mil (Curt Welch) writes:
- >In rec.audio, caro@adobe.com (Perry A. Caro) writes:
- >>Let's be clear here. Everything I've read about DCC indicates that all
- >>recorders will have the SCMS (Serial Copy Management System) for DIGITAL
- >>to DIGITAL copying. ...
- >
- >>If you're talking DIGITAL to ANALOG copying, then yes, each ANALOG
- >>generation will introduce noise and degrade the quality of the
- >>recording. SCMS does not apply to analog copying -- the inherent
- >>limitations of the technology are sufficient.
- >
- >Let's be clear here. If you make a DIGITAL to DIGITAL copy from
- >one DCC (or MD) to another, you don't get a perfect copy of the
- >tape either. This is because the data on the tape has to be
- >converted to the format of the interface (i.e. uncompressed) and
- >then converted back again. And we are being told that these
- >compression algorithms add more noise to the signal every time you
- >do this.
-
- The kind of "compression" in DCC is NOT the kind you are familiar with
- in computers. There is no "uncompression". Bandwidth is saved by
-
- data being thrown away, and once that is done, that data is not
- recoverable.>
-
- --
- -----------------------------------------------------------------
- Ted Grusec - Communications Research Centre, Ottawa, Ont., Canada
-