VoyForums
[ Show ]
Support VoyForums
[ Shrink ]
VoyForums Announcement: Programming and providing support for this service has been a labor of love since 1997. We are one of the few services online who values our users' privacy, and have never sold your information. We have even fought hard to defend your privacy in legal cases; however, we've done it with almost no financial support -- paying out of pocket to continue providing the service. Due to the issues imposed on us by advertisers, we also stopped hosting most ads on the forums many years ago. We hope you appreciate our efforts.

Show your support by donating any amount. (Note: We are still technically a for-profit company, so your contribution is not tax-deductible.) PayPal Acct: Feedback:

Donate to VoyForums (PayPal):

[ Login ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 1, 2, 3, 4, 5, 6, 7, 8, [9], 10 ]

[ Next Thread | Previous Thread | Next Message | Previous Message ]

Date Posted: 11:17:36 01/17/02 Thu
Author: Phil Q.
Subject: Re: SA8610x Rapid Random Inversion / privacy audio question
In reply to: RC 's message, "SA8610x Rapid Random Inversion / privacy audio question" on 15:12:25 01/15/02 Tue

RC,

The Rev7T1D2 code supports SA autoinversion. The cable system I used while developing that feature used SA 8600x and 8610x set-top terminals, although I never caught them doing RRI like I've seen on Zenith SSAVI systems in the past.

One potential problem with this code is that it uses the split-sync which is present during inverted video modes as a flag to invert the FOLLOWING frame. So if they rapidly change modes, then you could get a single frame of inverted video each time they switch. I might be able to revise the code to change modes during the same frame, but there isn't a lot of processor time left over on a 20MHz PIC to do it properly. PIU was working on some code that did it the "right" way, it looked at flag lines in the VBI to determine the video mode in use. He seemed to be close to getting it to work, but I don't know if he actually ever did.

It would be interesting to see what kind of results you get with that code in your area.

- Phil

[ Next Thread | Previous Thread | Next Message | Previous Message ]
[ Contact Forum Admin ]

Forum timezone: GMT-8
VF Version: 3.00b, ConfDB:
Before posting please read our privacy policy.
VoyForums(tm) is a Free Service from Voyager Info-Systems.
Copyright © 1998-2019 Voyager Info-Systems. All Rights Reserved.