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- Path: news.norconnect.no!news
- From: kenneth@norconnect.no (Kenneth C. Nilsen)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: Variable speed PAL video
- Date: 20 Mar 1996 12:19:45 GMT
- Organization: NorConnect Internet Services AS, post@norconnect.no
- Message-ID: <2550.6652T1336T1926@norconnect.no>
- References: <4iao6o$l1a@gossamer.itmel.bhp.com.au>
- NNTP-Posting-Host: login.norconnect.no
- X-Newsreader: THOR 2.22 (Amiga;TCP/IP)
-
- The 15-Mar-96 04:29:28, John Scheermeijer wrote in msg n/a :
-
- Hi,
-
- >Nowadays everyone, Amiga Technologies included, seems to be pushing
- >digital video, MPEG etc., for all it's worth. However, I see the main
- >strength of the Amiga technology as being it's compatability with the
- >still prevelant video standards. For a relatively small outlay on a
- >genlock and some public domain software, one can achieve have a fairly
- >impressive desktop video setup.
-
- >I believe there is still a long future for analogue video and wonder
-
- There will be analoug formats for many years. The only change for digital is
- the sound and the use of digital Betacam (Sony) and digital Panasonic systems
- in studios at edit levels.
-
- >whether there are any people out there that are working to capitalise on
- >this unique strength of the Amiga technology.
-
- >If I recall, video laser disk technology (ie. the large disks ) is
- >analogue based. Has anyone tried to adapt this technology or the VHS tape
-
- Correct. The analogue video signal is "sampled" and stored digitally, but the
- quality is as good/bad as the original signal at playback. The laser discs
- has a quality comparable to S-VHS.
-
- VHS with its 275 lines resolution will provide to bad quality. The Amiga can
- already deliver YC (S-VHS/Hi-8) quality and even YCrCb (YUV) with appropriate
- hardware.
-
- >based technology for variable speed play back (ie. noiseless)? I realise
- >the associated monitor's screen raster rate would need to be changed in
- >synchronism. I would have thought that an Amiga genlock could be designed
- >to cope with this form of operation without to much difficulty and that
- >this new form of operation could lend itself to many useful applications.
-
- It's not quite like this. The technique used for slowmotion etc. is called
- Dynamic Tracking. It's more a mechanical-digital prosessing and have nothing
- to do directly with the PAL or NTSC sync rates. DT is a complicated prossess
- and in 'old' days you had to spend lots of grands to get DT. The industy has
- managed to make DT cheeper so it can be implemented in consumer video players
- at an affortable price. The MPEG and other store-formats are independed on
- the signal format it's show thrue. MPEG files and other anim formats have to
- be software controlled (or logically by chips) to vary the playback speed.
- You don't need to alter sync rates.
-
-
- ---
- Worldwide Solutions AS \ Kenneth C. Nilsen (kenneth@norconnect.no)
- Advisor, developer \/\/\/\ http://www.norconnect.no/~kenneth/
- coordinator \
-
-