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kt7000
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Post subject: Re: Which is Better, CLV or CAV? Posted: 06 Sep 2015, 23:54 |
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Joined: 17 Apr 2015, 20:34 Posts: 118 Location: United States Has thanked: 8 times Been thanked: 7 times
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Quote: CAV has somewhat better performance in a technical sense, owing to the increased "headroom" above the carrier frequency in the outer portion of the disc. This results in less distortion & noise with respect to the chrominance signal, & less intermodulation between the audio & video carriers. It also allows for perfect single-frame play modes Those are all definite features that I look for in LD performance. The additional 30 min playback in a CLV means nothing now if the other has much better quality. It's just unfortunate that there aren't that many of them out there.
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rick_dangerous
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Post subject: Re: Which is Better, CLV or CAV? Posted: 25 Aug 2020, 21:01 |
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Joined: 26 Feb 2020, 21:43 Posts: 79 Location: United States Has thanked: 14 times Been thanked: 26 times
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I am trying to wrap my head around this. So:
CAV: better performance/picture, less convenience (shorter disc sides)
CLV: More generally used format, longer sides, slightly lower performance/picture quality.
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rein-o
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Post subject: Re: Which is Better, CLV or CAV? Posted: 26 Aug 2020, 01:19 |
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Joined: 03 May 2004, 19:05 Posts: 8108 Location: Dullaware Has thanked: 1221 times Been thanked: 846 times
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signofzeta wrote: I think the R7G lets you see field by field instead of just frame by frame in CAV. I’ve never used it though. Yes that's it, you can go frame by frame or select the button and then field by field or 2 for every frame, its pretty cool when your player has it, but I also don't use still step anymore if at all.
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rch928
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Post subject: Re: Which is Better, CLV or CAV? Posted: 31 Dec 2020, 06:47 |
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Joined: 30 Jan 2014, 09:12 Posts: 171 Location: United States Has thanked: 2 times Been thanked: 5 times
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audioboyz1973 wrote: With CAV one rotation is one frame from beginning to end (hence the very visible two blanking intervals - two fields = one frame).
Does this mean the discs are spinning at 24 spins/s for 24fps? I am surprised these players are still intact. Kudos to the engineers.
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admin
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Post subject: Re: Which is Better, CLV or CAV? Posted: 31 Dec 2020, 09:45 |
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Joined: 07 Aug 2002, 23:37 Posts: 4551 Location: Tokyo Has thanked: 295 times Been thanked: 1147 times
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rch928 wrote: Does this mean the discs are spinning at 24 spins/s for 24fps? I am surprised these players are still intact. Kudos to the engineers. Actually more (rps = round per second), calculation based on the rpm provided on Wikipedia: NTSC/Hi-Vision CAV = 30rps PAL CAV = 25rps NTSC CLV = from 30rps at the beginning to 10rps at the end of a side PAL CLV = from 25rps at the beginning to... 8.33ps? at the end of a side Hi-Vision CLV = ~41.17rps at the beginning to ~15.59rps at the end of a side A MUSE/Hi-Vision CLV disc spinning does feel like a plane is taking off, explaining why the MUSE player are more heavily built. A CD Audio rotates at 3.33rps, a DVD at 9.67rps and a BD at 13.5rps. Of course they are much smaller and especially much lighter. This is why the LD mass inside the player must be pretty well centered, disc not warped or missing bits, otherwise the gravity center of the disc will not align with the player and you will either get an error message, turn your player into a washing maching or eventually crack the disc/player entirely. Julien
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happycube
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Post subject: Re: Which is Better, CLV or CAV? Posted: 31 Dec 2020, 22:34 |
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Joined: 18 Apr 2012, 18:02 Posts: 1614 Location: United States Has thanked: 71 times Been thanked: 88 times
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CLV disks start with about the same quality as CAV, and get better further into the side as pit size increases. On a Domesday Duplicator/ld-decode setup, it's possible to see a 5-10dB pre-NR increase in signal quality (i.e. 38 to 44-46dB) from the beginning to end of a side. Those marketing 52-54dB SNR player numbers are all based on the end of a CAV side. In addition below 10000 frames on a CAV disk (and therefore an entire CLV disk), the higher frequencies are attenuated enough that special processing is needed. If MUSE/red diode laser players were common, this wouldn't be as bad since their spot size would mostly make up for this.
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signofzeta
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Post subject: Re: Which is Better, CLV or CAV? Posted: 31 Dec 2020, 23:03 |
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Joined: 14 Jan 2010, 09:44 Posts: 5992 Location: Ann Arbor Has thanked: 1295 times Been thanked: 1107 times
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rch928 wrote: sheesh...I thought they were more like 1 spin / 1 second. Really interesting. Now I am worried about my 24 year old player breaking. Slower than a record? I don't know if any disc spins that slow...other than the Kodak disc.
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rch928
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Post subject: Re: Which is Better, CLV or CAV? Posted: 01 Jan 2021, 22:47 |
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Joined: 30 Jan 2014, 09:12 Posts: 171 Location: United States Has thanked: 2 times Been thanked: 5 times
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signofzeta wrote: rch928 wrote: sheesh...I thought they were more like 1 spin / 1 second. Really interesting. Now I am worried about my 24 year old player breaking. Slower than a record? I don't know if any disc spins that slow...other than the Kodak disc. forgive the ignorant, 1 spin per second seems pretty speedy...especially on those large discs.
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