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- Path: sparky!uunet!munnari.oz.au!ariel!ucsvc.ucs.unimelb.edu.au!lugb!news
- From: MATGBB@LURE.LATROBE.EDU.AU (BYRNES,Graham)
- Newsgroups: rec.audio
- Subject: Re: 20 or 24 bit digital recording?
- Message-ID: <1992Jul24.074842.15614@lugb.latrobe.edu.au>
- Date: 24 Jul 92 07:48:42 GMT
- References: <1992Jul20.155356.12452@phillip.edu.au> <7640089@hpfcbig.SDE.HP.COM>
- <1992Jul23.212018.16396@ccu1.aukuni.ac.nz> <1992Jul24.011417.10677@lugb.latrobe.edu.au> <1992Jul24.043605.23869@ccu1.aukuni.ac.nz>
- Sender: news@lugb.latrobe.edu.au (USENET News System)
- Organization: La Trobe University
- Lines: 39
- In-Reply-To: stuartw@ccu1.aukuni.ac.nz's message of 24 Jul 92 04:36:05 GMT
- X-News-Reader: VMS NEWS 1.22
-
- In <1992Jul24.043605.23869@ccu1.aukuni.ac.nz> stuartw@ccu1.aukuni.ac.nz writes:
- > >> ( ie:on audio data, you can EASILY get 1:8 compression NON-LOSSY ..
- > >> anyone for an 8hour CD format??? )
- >
- > >News to me: Why is DCC so contentious at 1:4, and mini-disk admitted
- > >(by Sony) to be inferior to CD at 1:5????
- > >Graham B
- >
- > because:
- > 1) audio people LOVE to think that it is HARD to do these things,
- > and that compressed data MUST be inferiour..
- > and ( even more important.. )
- > 2) audio companies do not want to shell out to design the hardware
- > to do this at audio rates ( ie: it can be done, but I did not
- > say easily.. B-)
- > remember MOST audio data ( excepting perhaps some SPEED METAL ... ) uses a
- > VERY SMALL FRACTION of the 20kHz bandwidth available at any one time...
- > ( yes, many people will disagree, but I write compressors, and listen to/
- > analyze much music... )
- Well, I can't challenge you r expertise in compression, although you did
- say easily(8-).
-
- I'm still surprised that if it is technically feasible to do as you say,
- Philips et al are playing about with PASC etc, which IS lossy,
- although perhaps not audibly. In fact, Pasc relies on the fact that only
- a small fraction of the bandwidth is audible at a given time to ditch the
- rest. If only a small amount was in fact USED, PASC would be loss free,
- right? Now I'm told, but have not seen, that conventionally measured
- distortion is in the several percent region. Bypassing questions of
- audibility, that means it surely IS lossy. So what are you proposing that is
- different to PASC, MUSE etc?
-
- Finally, who wants an 8hr CD? Since 95% of the cost is in intangibles,
- an 8hr CD would sell for about $200 in Australia!!!! (who knows how much
- in Rogernomicked NZ). But it would allow easy digital broadcasting, which
- is why the EBU would probably be very happy if you are right.
-
- Yours in scepticism,
- Graham B
-