Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10 5/3/83 based; site hou2a.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxt!houxm!hou2a!pjk From: pjk@hou2a.UUCP (P.KEMP) Newsgroups: net.video Subject: Re: Stereo confusion Message-ID: <590@hou2a.UUCP> Date: Mon, 19-Aug-85 11:40:06 EDT Article-I.D.: hou2a.590 Posted: Mon Aug 19 11:40:06 1985 Date-Received: Tue, 20-Aug-85 22:02:17 EDT References: <3712@decwrl.UUCP> Organization: AT&T Bell Labs, Holmdel NJ Lines: 64 [Sorry to continue this discussion over the net, but there are some items that are of general interest.] Steve, I'm sorry if I misunderstood some of your statements on VCR AFM recording, but there still appears to be some confusion remaining. In VHS AFM HI-FI recording, the FM modulated audio signals are recorded in a frequency band where there is still substantial video signal energy. That is why "Depth-Multiplexing" is used. The AFM signal penetrates deeper into the tape because the AFM heads have wider gaps than the video heads. The wider gaps do not pose a problem because of the lower frequencies of the AFM carriers. This, along with head azimuth offset, minimizes the interference between the AFM and video signals. I can't believe that the new, top-of-the-line, Panasonic 1740 can't PLAY Dolby stereo linear audio, but Steve is correct! The review of the 1740 in the September issue of VIDEO Magazine states in the last paragraph: > Note: if you want linear-track stereo, buy last > year's models now. Almost all VHS manufacturers > are switching from stereo to a mono linear track. I guess I'll keep my Quasar 5845 VHS HI-FI for awhile. It can both RECORD and PLAY the linear audio tracks in Dolby stereo. As far as "enhanced" VHS from JVC goes, Steve Lionel boasted in his original posting: > Well, that's our history lesson for today. Perhaps in a year or so, we'll > see if JVC MANAGES TO COME UP WITH SOMETHING *APPROXIMATING* Superbeta. From > recent announcements, it doesn't seem that way. Well, I think that "enhanced" VHS from JVC is something approximating SuperBETA. While it doesn't actually increase the video frequency response by much, it does make the picture *appear* sharper. This along with the video noise reduction technique that JVC is now working on, should result in better quality VHS pictures in the future. Does anyone know if tapes recorded with "enhanced" VHS will appear sharper played back with a regular VCR? Since it works as a pre-emphasis, I think it would. I personally feel that the BETA system is technically superior to the VHS system, but unless your video system can exist independent of the outside world (or you happen to have friends and video stores nearby that have BETA), you are better off with VHS because of its overwhelming popularity now. Sony is now the only VCR manufacturer that produces only BETA home VCRs, and they are placing their bets on 8mm as the format of the future. -- Paul Kemp ihnp4!hou2a!pjk