Component (Y/PB/PR) connection question

Discussion in 'Archived Threads 2001-2004' started by Thom J., Feb 10, 2003.

  1. Thom J.

    Thom J. Auditioning

    Joined:
    Feb 10, 2003
    Messages:
    6
    Likes Received:
    0
    My question concerns lip sync issues, but first here is the set-up.

    I just bought a Sony WEGA KV-34XBR800 hd monitor along with a Toshiba SD-3800 dvd player. I also will be swapping out my current digital cable box for a cable box that will act as my hd tuner (as well as cable). I am using a Sony STR-DA30ES receiver.

    My Receiver does not have component(Y/PB/PR)inputs or outputs.

    I have run the component output cables from the dvd player to the component inputs on the tv and will do the same with the cable/hd tuner.

    My question is by having the component video feeds bypass the receiver should I expect to encounter any lip sync issues? On one dvd it seemed that I had issues and other it did not. Is it necessary to run the component video feeds into receiver just like the audio.

    A follow up question would be if I upgraded the receiver to one that has component inputs/outputs how high of bandwidth would be needed to properly handle the feed?

    Sorry for the long post,
    Thom J.
     
  2. AaronBatiuk

    AaronBatiuk Second Unit

    Joined:
    Aug 23, 2002
    Messages:
    333
    Likes Received:
    0
    The receiver does absolutely no processing on the signal, so it has no effect whatsover on lip sync. Putting the signal through an active processor such as a line doubler will delay the video to some extent and could result in lip sync issues.

    The only issue with running the video through your receiver is signal loss and signal quality. The component video sections of many receivers are not up to 1080i HDTV, but most if not all can handle 480p quite fine (Although 480p has nearly as many scanlines per second as 1080i, its horizontal resolution is only 720 pixels compared to 1920 pixels). A standard interlaced video signal requires about 6.5 MHz of bandwidth. A progressive scan version requires double that: about 13 MHz. However, note that a receiver rated at say 27 MHz component bandwidth will not do 27 MHz without signal loss. The difinition of bandwidth is the -3 dB point (half power). So those 27 MHz I/O's will result in loss of quality for a 27 MHz signal. You should go for about double the "bandwidth" that you need, so that you stay well below the point where signal loss begins to occur. So, for progressive DVD, shoot for 27 MHz or higher; for HDTV, shoot for 50 MHz or higher.
     
  3. Jesse Blacklow

    Jesse Blacklow Cinematographer

    Joined:
    Oct 14, 2002
    Messages:
    2,049
    Likes Received:
    0
    It's not necessary to use a receiver to pass component signals, and any lip-sync issues would most likely be coming from the DVD player or the disc itself. Same with HDTV. If you want to use a receiver with HD-capable switching, look for at least 35 Mhz bandwidth, 40 if possible. If your TV has enough component ins (which I think yours does), let the TV handle the signal straight from the DVD player and cable box.

    There is a caveat, though: Cable and satellite use different High-def signals than over-the-air (OTA) tuned signals. I don't know of any HD cable box that can be used as a tuner for broadcast HDTV. Your cable company (Time-Warner?) will be able to tell you what HD channels they carry. Most have HD HBO and Showtime, but the network channels are all over the place. It depends on the local affiliates and their deals with the cable company. For instance, Comcast in my area gets the big 3--ABC, NBC, and CBS, plus PBS, but not WB (even though the OTA signal is digital) or UPN. Check with your provider.
     
  4. Thom J.

    Thom J. Auditioning

    Joined:
    Feb 10, 2003
    Messages:
    6
    Likes Received:
    0
    Thanks for the info. I love the receiver and was not looking forward to upgrading.

    The TV does have 2 sets up component inputs (one for dvd and one for hd tuner).

    Thom J.
     
  5. JeremyFr

    JeremyFr Supporting Actor

    Joined:
    Jan 28, 2003
    Messages:
    794
    Likes Received:
    0
     
  6. Bob McElfresh

    Bob McElfresh Producer

    Joined:
    May 22, 1999
    Messages:
    5,182
    Likes Received:
    0
    Over in the Receivers fourm there is a thread on HD video switching. Several external, HD compatible switches are discussed. If you are currently using direct feeds to your TV and ever purchase say an XBox (which offers progressive video for it's games) you are out of inputs. These video switchers allow you to keep your beloved receiver.

    Good Luck.
     
  7. AaronBatiuk

    AaronBatiuk Second Unit

    Joined:
    Aug 23, 2002
    Messages:
    333
    Likes Received:
    0
     
  8. JeremyFr

    JeremyFr Supporting Actor

    Joined:
    Jan 28, 2003
    Messages:
    794
    Likes Received:
    0
    my point was simply that if you had 720 horizontal lines it would be the wrong aspect, ok lets look at ATSC standards for HDTV, 480p=720vX480h pixels, 720p=1280vX720h pixels, & 1080i=1920vX1080h pixels. I understand the conept of scan lines and all was trying to simply correct someone who said that 480p produces 720 horizontal lines when it produces 480 lines and 720 pixels accross.
     

Share This Page