Senin, 12 Agustus 2013

can i use an upconversion dvd player with a regular tv?

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nutmeggers


i am looking for a new dvd player, and i am looking to spend between $50-100 (the price range i settled on b/c i think under $50 and it's a disposable machine - at least it has been my experience lately). my question is, the best rated dvd player i see at my local store is a dvd with upconversion. i looked up that term and find it connected with HDTV. I have a regular, run-of-the-mill toshiba tv. can i still use this dvd player? better yet - will the upconversion work on my regular tv, or is it a feature i shouldn't spend the $$ on? thanks!


Answer
You can still use the upconverting DVD player on a regular TV. Obviously it won't be able to upconvert, but the DVDs will still play.

Even entry level DVD players are providing upconversion now-a-days with many falling well within your price range, so don't worry about that.

And, if you do get a HDTV later on, all you'll need is a new cable to connect your DVD player to it, and all your DVDs will receive an instant upgrade.

What should I try adjusting to stop my dvd audio from getting out of sync during a movie?




Diver Dude


I have a basic home theatre setup with a low-end toshiba dvd player feeding into Onyko an receiver. From there the receive passes the video signal to my plama and sound to 5 speakers. For some reason as a dvd continues the audio gets out of sync (falls behind) the video. If I switch the chapters forward/back everything catches back up. The longer the movie, the more out of sync the two elements get. Cable signals do not have this issue.

What should I check?
Thanks for the great answer.

The setup in question is my secondary; a low end EDTV from Sylvania (6842PEM).

DVD player is a Toshiba SD-4000

My receiver is an Onkyo TX-SR504

Everything is connected using component cables (no HDMI on the tv or receiver). Sound from the dvd player goes to the receiver using a digital audio cable.

The receiver is fairly high end but the dvd player and plasma are not so I would imagine the issue lies with one or the other. I suppose the best thing to do at this point is just to swap in another dvd player and see if that fixes things.



Answer
Youâre experiencing what is commonly known as âLip Syncâ error most likely the result of an under-powered or poorly programmed image / video processor in your DVD player, AV receiver and/or display.

âVideo regularly undergoes digital signal processing over more than one frame of video causing the video signal to arrive later than the audio signal. Without the ability to digitally delay the audio signal to match the video signal in real-time consumers will continue to be exposed to the potentially annoying effects of lip-sync error, depending on equipment and source material. Lip-sync error becomes particularly irritating (depending on a personâs sensitivity) when the video is substantially delayed behind the audio by more than approximately 30 milliseconds.â

âVirtually all HDTVs now include some kind of video processing chip that performs complex tasks such as de-interlacing video signals, converting from the format/resolution of the source signal to the native resolution of the display, enhancing color appearance, removing noise, and so on. These video processing activities require that multiple frames of video be buffered and analyzed before each video frame is output and displayed. As a result, there exists a delay from the time the video is received into the TVâs input to the time the video is actually on the screen. Keep in mind that one frame of video at 60Hz refresh rate (common for todayâs HDTVs) corresponds to 16 msec. Since video processing typically requires anywhere from 2 to 5 frames of video to be buffered, this video processing results in 33 to 83 msec of latency. Humans are very sensitive to multimedia content where the audio is heard before the âlipsâ move (humans are less sensitive to perceiving audio that is slightly delayed behind the video). When the audio is more than 50 msec ahead of the video, the average viewer can detect this latency problem.â

âAlmost all HDTVs integrate audio delay electronics that automatically delay the audio signal going to the TVâs speakers to be in proper synchronization with the buffered video. However, when the audio is presented by a device other than the TV (such as by an A/V receiver), the TV no longer controls the audio signal and ensuing improper audio/video synchronization can be experienced.â

First things first check and see if any firmware updates have been released for your DVD player, AVR, and display. Next, check the ownerâs manuals for your display, DVD player and AVR to see if any of those components are equipped with some form of audio delay - either automatic or manual. If that fails to help you resolve your audio-video sync problem then your next step will be to track down the offending culprit(s). I suggest connecting your DVD player and AVR to a friends HDTV or ask a manager at one of your local A/V retailers if you can bring your DVD player and AVR to their showroom and try it with a couple of different displays, in each case always using the same connections that youâre at home.

If you provide the specific model numbers of your A/V equipment, a more detailed description of exactly how your equipment is connected, i.e., specifically which type of connections youâre using - HDMI, component, composite, S/PDIF, etc., and the specific type of source material, i.e., HD or SD video content, that is affected by the âLip Syncâ error, I or another Y!A contributor would (or should) be able to provide greater assistance.
________________________

Resources:

http://www.hdtvmagazine.com/articles/articles-author.php?id=16

http://answers.yahoo.com/question/index?qid=20070508163453AAP9hwk

Charles A. Poynton, âHigh Definition Television and Desktop Computingâ
http://www.multimedia.edu.pl/invocom/MultimediaPL/txt/Poynton.pdf
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Follow-up Reply:

Thanks for the additional information.

On page 58 of your Onkyo TX-SR504 Instruction Manual it states that the TX-SR504 receiver is equipped with an âA/V Syncâ setting. I would try adjusting the A/V Sync setting to see if it corrects the A/V sync error you're experiencing.

Quoted from page 58:

âWhen using progressive scanning on your DVD player, you may find that the picture and sound are out of sync. With this setting, you can correct this by delaying the audio signals. You can set it from 0 to 100 milliseconds (ms) in 20 millisecond steps.â

âNote: This setting is not available when the Pure Audio listening mode is used, or the Direct listening mode is used with an analog input signal.â

Onkyo TX-SR504 Instruction Manual
http://63.148.251.135/redirect_service.cfm?type=own_manuals&file=TX-SR504_En_Web_.pdf
 




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