Originally Posted by flossy
Hi, I'm about to pull the trigger and buy my self one of these sets, I was wondering if anyone can tell me if using a A/V receiver with this set will I experience lip sync? I heard that there are a lot of issues with sound delays when used with an A/V receiver.
This can occur, but generally does not. here is a good explaination from the oppo.digital web site:
"Q: What causes Audio sync issue?
A: The Audio-sync error can be caused by several factors. The most common are video source (DVD mastering) and video buffering.
How the DVD was mastered will affect the overall playback. There are many DVDs which have been mastered incorrectly and suffer from slight audio-syncing not matter what player or display unit is used. The effect of de-syncing can be so negligible it is barely noticeable, to such an extreme that whole audio bits are audible before the according visual actions.
Another common type of Audio-sync errors is the cumulative effect of video buffering. In order to produce the best possible video quality, when the Faroudja chip in the DVD player performs de-interlacing and scaling, it may need to buffer some video frames to do motion analysis. This introduces a slight delay to the video. Usually this delay is not noticeable by the viewers. Certain displays also buffer video frames for many reasons - to scale up the 720p or 1080i video to the display's native pixel resolution, or to process the video in order to reduce the rainbow effect on some DLP displays, or even to do motion analysis and adaptation (duplicated effort but cannot be turned off). The buffering by displays introduces another video delay. Since normally audio is not delayed, the cumulative video delay becomes noticeable and causes the Audio-sync problem. The problem happens rarely and randomly because the time it takes the DVD player and the display to process the video depends on the complexity of the video scene.
As a rule of thumb, if the Audio-sync error occurs infrequently and at preset moments, it is a DVD mastering issue. When it occurs frequently and is not repeatable by rewinding, stopping and resuming playback, then there are several steps you can take to prevent instances of Audio-sync errors. See below.Q: How to fix Audio-sync issue?
A: Audio syncs are DVD player, display device, and DVD dics dependent. From dvd player perspective, the solution to the Audio-sync error is to introduce an audio delay to compensate for video buffering. There are two ways to do this: 1. The OPDV971H has an audio delay feature. To access this feature, press the Setup button, then select Delay in the Audio tab. Audio delays are selectable from no delay to 50ms in 10ms intervals. 2. Some audio receivers can also adjust audio delays. The optimal audio delay depends on the display device so it can only be obtained by experimenting. For extreme cases, Stopping and Resuming DVD playback will stop Audio-sync errors"
Originally Posted by Beto3645
HD channels, however, output digital audio encoded in Dolby Digital. Unfortunatley, to decode Dolby Digital I will need either an AV preamp processor or an AV receiver. Am I right
Many digital as well as all HD channels output digital sound. You need an external receiver which at minimum decodes Dolby Digital EX / Pro-Logic II for 5.1 channel support, and there are 6.1/7.1 channel receivers that also support DTS-ES 6.1 and THX Certified 7.1 channel sound.
Originally Posted by skg74
That was great!! I just took out my audio cable (stereo) from the TV and put it into my STB and.. now I have surround sound from TV!! Thanks a ton..
one last question.. is it a big quality jump from stereo audio cables to coax or optical..
again, I appreciate all your help!
I'm not sure what you're asking here? The TV does not have digital sound (coax/optical) inputs. Those types of connections from your STB are intended to be used with an external 5.1/6.1/7.1 channel receiver. And yes, Dolby Digital 5.1 or DTS-ES surround sound provide a BIG step up, really enhance the entire audio/visual experience.