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- Path: sparky!uunet!spool.mu.edu!agate!dog.ee.lbl.gov!hellgate.utah.edu!cc.usu.edu!slgyp
- From: slgyp@cc.usu.edu (Doran L. Barton)
- Newsgroups: rec.video
- Subject: Re: digital video camcorders?
- Message-ID: <1992Dec30.195404.62368@cc.usu.edu>
- Date: 30 Dec 92 19:54:04 MDT
- References: <1992Dec30.164327.13646@emr1.emr.ca> <5406@calmasd.Prime.COM>
- Organization: Utah State Univ. - Elec/Comp Engineering
- Lines: 29
-
- In article <5406@calmasd.Prime.COM>, jpb@calmasd.Prime.COM (Jan Bielawski) writes:
- > In article <1992Dec30.164327.13646@emr1.emr.ca> jagrant@emr1.emr.ca (John Grant) writes:
- > <Why are camcorders (8mm,vhs-c,etc) still analogue? If DAT is so great,
- > <why aren't there any camcorders recording digitally (DAT or similar)?
- > <Doesn't DAT have enough bandwidth for video?
- >
- > No, it's nowhere near. The highest frequency needed for audio
- > is about 20 kHz. Even for the worst quality video -- namely, VHS --
- > you need, say, 3.25 MHz and if you want something on the order of Hi8,
- > you'd want something around 5 MHz. So you need a sampling frequency
- > of at least 6.5 MHz instead of DAT's 48 kHz. That's more than 135 times
- > as fast for a resolution inferior to that of 8mm. I doubt this could be
- > done on a DAT-sized (or 8mm-sized) drum.
-
- Well... I am sure it COULD be done... But you wouldn't be able to get
- very much video on one tape. It would be spinning so fast and the tape
- would have to be recorded as such a ludicrous speed... Those 8mm 120
- minute tapes would be like Super-8 movie reels with only about 5
- minutes worth of images.
-
- Someday folks... Someday.
-
- Doran
-
- ___ ___ ___ ___ ___ Doran L. Barton - Undergraduate Student
- | | |___ | | Electrical/Computer Engineering
- |___|= ___|= |___|= slgyp@cc.usu.edu / slgyp@usu.bitnet
- College of Engineering_ ``My how time flies when you're dead'' -Anon
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