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- From: kega@nobeltech.se (Kent Gabrin)
- Subject: Re: DAT, DCC and MD
- Message-ID: <1993Jan27.071204.4174@nobeltech.se>
- Organization: NobelTech AB
- References: <C19CFs.Fw1@fulcrum.co.uk> <1993Jan22.190811.28768@e2big.mko.dec.com> <C1Eun7.3y8@fulcrum.co.uk>
- Date: Wed, 27 Jan 1993 07:12:04 GMT
- Lines: 41
-
- In article <C1Eun7.3y8@fulcrum.co.uk> igb@fulcrum.co.uk (Ian G Batten) writes:
- >In article <1993Jan22.190811.28768@e2big.mko.dec.com> winalski@adserv.enet.dec.com (Paul S. Winalski) writes:
- >> In article <C19CFs.Fw1@fulcrum.co.uk>, igb@fulcrum.co.uk (Ian G Batten) writes:
- >> |>DAT also requires highly accurate helical scan heads. These will always
- >>
- >> And DCC requires highly accurate thin-film fixed heads.
- >
- >Helical scan heads must be accurate, and the means of moving them must
- >be accurate. Fixed heads requires a stable tape path, but that's much
- >easier to arrange.
-
- To avoid to have too much accurate alignment of the rotating head
- you can use a technique used by SONY in its tiny little machine called
- SCOOPMAN. The system is called NT (Non Tracking) and when reading the
- track it reads more tracks at the same time and uses memory buffers to
- determined how to assemble the bits in the right order.
-
- Yes I know it's a dark horse and some maybe bet that it will take the
- same way as the ELCASSETTE did.
-
- Another problem (small though) is that DAT uses time interleaved
- method when storing bits on the tape. That makes it sometimes a bit
- tricky when you edit music (especially in LP mode). One little time
- fraction of the music is scattered in time on several tracks on the
- tape. I don't recall how much this 'time delay' is but I guess it is
- in the neighborhood of 0.5 s in standard play mode (44.1 & 48 kHz).
- Some one more involved in RDAT should comment on that.
-
- Come to thinking, PASC and ATRAC must also suffers from above
- mentioned 'time delay'. Anyone know how long that delay is?
-
- /Kent
-
- P.s. With 'Time delay' I mean the smallest fraction (in time) of music
- you can record on a tape without loosing information. D.s.
-
- Kent Gabrin NobelTech Systems ! My thinking is not as great as
- S-175 88 Jaerfaella Sweden ! Oliver Berendinus Bumble /Will Try
- KEGA@nobeltech.se ! Following the discussion of Digital technique.
-
-
-