JP1 Remotes Forum Index JP1 Remotes


FAQFAQ SearchSearch 7 days of topics7 Days MemberlistMemberlist UsergroupsUsergroups RegisterRegister
ProfileProfile Log in to check your private messagesLog in to check your private messages Log inLog in

red & blue flecks in VHS images

 
Post new topic   Reply to topic    JP1 Remotes Forum Index -> Electronics Repair
View previous topic :: View next topic  
Author Message
av-geek



Joined: 02 Jan 2007
Posts: 1

                    
PostPosted: Tue Jan 02, 2007 11:31 pm    Post subject: red & blue flecks in VHS images Reply with quote

Greetings everyone! I've seeked out this forum to see if any of you all can help me with a VCR problem. Yes, I know, they're old technology, but I've still got a big collection of VHS tapes, and I've got some nice equipment around the house here. One of those nice devices is a Panasonic AG5710 SVHS editing deck that doesn't seem to like pre-recorded tapes. This is a screen shot of Pink Floyd "Delicate Sound of Thunder" I picked this tape because there is plenty of dark scenes in it, but other pre-recorded VHS movie tapes and stuff produce the same results. This deck doesn't have very many hours on it at all, because all I really use it for is transferring media to DVD-R. It is in my office however, and I want to use it for watching shows while doing some other chore. The monitor in this screen shot is a fancy 19 inch Sony PVM studio monitor

Now, here comes the weird part. All those pre-recorded tapes play perfect in my household grade S-VHS omnivision deck, and my JVC HR-s6800 deck. The Pansonic editing deck also plays tapes that *I* recorded perfectly (no matter what deck they were recorded on), both in S-VHS and standard VHS mode (I don't have any pre-recorded SVHS to test it with however)

Am I dealing with some type of macrovision artifact here or some other copy-protection issue that is incompatible with the professional grade deck? I thought I was dealing with the ususal metal-film capacitor failures so common on Panasonic decks, but if that were the case, all tapes would play bad.

Back to top
View user's profile Send private message Yahoo Messenger
zaphod7501



Joined: 02 Aug 2004
Posts: 533
Location: Peoria Illinois

                    
PostPosted: Wed Jan 03, 2007 9:11 am    Post subject: Reply with quote

I'm really not sure but you should try turning off any DNR features. It could be artifacts created by that circuitry (or all of those capacitors in that circuit). You should also try tracking, because Hi-Fi tracking and Video tracking will be slightly different, especially when a tape stretches with use.

You could also be seeing a Hi-Fi stereo artifact. This will also produce visual interference during extremes of video and audio levels. (both high and low video and audio) That particular machine could have a problem seperating them. VHS Hi-Fi records video literally over the top of the Hi-Fi audio and it will produce visual artifacts under very bright or very dark scenes with either very high or very low audio levels.

The differences, that I see, between OK and not OK tapes and machines are the DNR circuits, the Hi-Fi tracks, and possible worn or stretched tapes; so those would be the things to experiment with.

A prerecorded tape was not recorded with a VCR but was performed with a high speed duplication process that actually gives it higher resolution so worn heads could also give you that effect.

Personally, I decided that my Beta tapes transfer to DVD just fine but that I'm not going to bother with anything that was on VHS.
_________________
Just call me Zaphod (or Steve) --- I never should have started using numbers in a screen name but I just can't stop now.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic       JP1 Remotes Forum Index -> Electronics Repair All times are GMT - 5 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


 

Powered by phpBB © 2001, 2005 phpBB Group
Top 7 Advantages of Playing Online Slots The Evolution of Remote Control