What frequency do various signals run at?

Discussion in 'Archived Threads 2001-2004' started by John-Miles, Jan 28, 2003.

  1. John-Miles

    John-Miles Screenwriter

    Joined:
    Nov 29, 2001
    Messages:
    1,216
    Likes Received:
    3
    Trophy Points:
    110
    I am curious for things like component video switching, what frequency is required?
     
  2. Doug_B

    Doug_B Screenwriter

    Joined:
    Feb 11, 2001
    Messages:
    1,081
    Likes Received:
    0
    Trophy Points:
    0
    Depends on the source material being carried. DVD resolution (say 480p) requires less bandwidth than HD (say 1080i). If memory serves, somewhere in the neighborhood of 7 MHz for the former and 37 MHz for the latter. A component switcher that supports 50 MHz bandwidth (+-3 db) will likely be OK for 1080i, I believe. Others can confirm this.

    Doug
     
  3. John Kotches

    John Kotches Cinematographer

    Joined:
    Mar 14, 2000
    Messages:
    2,635
    Likes Received:
    0
    Trophy Points:
    0
    Doug,

    Others won't confirm this.

    You want a bare minimum of 100MHz to cleanly pass HD signals, and higher is better. 150 is better.

    When specing at 37MHz, that's the -3dB point, which means you are already dropping off fine detail.

    The same is true at 50MHz.

    Personally, I use an Extron switcher which is really geared towards PCs but works fine for Component Video switching and has a -3dB point of 350MHz.

    Regards,
     
  4. Iver

    Iver Second Unit

    Joined:
    Sep 23, 2002
    Messages:
    324
    Likes Received:
    0
    Trophy Points:
    0
     
  5. John-Miles

    John-Miles Screenwriter

    Joined:
    Nov 29, 2001
    Messages:
    1,216
    Likes Received:
    3
    Trophy Points:
    110
    I have a toshiba 36HFX71 2 HD inputs im looking at a YamahaRX-V1300 it has a 60Mhz component switcher

    I guess i will just put dvd through the receiver and HD straight into the TV
     
  6. ManW_TheUncool

    ManW_TheUncool Producer

    Joined:
    Aug 18, 2001
    Messages:
    6,015
    Likes Received:
    40
    Trophy Points:
    6,610
    Location:
    The BK
    Real Name:
    ManW
    The other thing to consider is that your Toshiba direct-view probably can't come close to using a full resolution HD signal anyway. In another current thread, Michael_TLV mentioned that the Sony 36XBR450 can only do about 750 lines of absolute horizontal resolution.

    http://www.hometheaterforum.com/htfo...hreadid=121628

    I don't know how insufficient bandwidth will affect the final results, but if all you lose is some fine details w/out gaining any artifacts, then you probably will never see a difference anyway. Also, the 35Mhz usually quoted is for full 1080i resolution, which has 1920 lines of absolute horizontal resolution. Nobody actually provides this much resolution right now.

    Of course, you might also want to consider future upgrades that might make the bandwidth limitation an issue. But then again, maybe it won't matter if the content providers have their way and force us all to switch to DVI and/or Firewire in the future.

    _Man_
     
  7. John-Miles

    John-Miles Screenwriter

    Joined:
    Nov 29, 2001
    Messages:
    1,216
    Likes Received:
    3
    Trophy Points:
    110
    Damn Man, you making me depressed..... ah well its a worry for another day [​IMG]
     
  8. ManW_TheUncool

    ManW_TheUncool Producer

    Joined:
    Aug 18, 2001
    Messages:
    6,015
    Likes Received:
    40
    Trophy Points:
    6,610
    Location:
    The BK
    Real Name:
    ManW
    Ha ha. But you know you love the hurting from all the worries. [​IMG]

    _Man_
     
  9. John-Miles

    John-Miles Screenwriter

    Joined:
    Nov 29, 2001
    Messages:
    1,216
    Likes Received:
    3
    Trophy Points:
    110
    But Man, you really dont understand the level of my sickness.... Im 22 still a student in university, and ive sunk almost 10k into my home theater..... its all crammed into my little bedroom. hell i have spent more on this than some of my friends have in student loans... this does not bode well for when i get a real place tolive and have a full time job. [​IMG]
     
  10. ManW_TheUncool

    ManW_TheUncool Producer

    Joined:
    Aug 18, 2001
    Messages:
    6,015
    Likes Received:
    40
    Trophy Points:
    6,610
    Location:
    The BK
    Real Name:
    ManW
    Yikes! That IS pretty extreme. [​IMG]

    I remember dreaming about spending that much on a stereo setup back when I was a senior in college--ok, 10K just for a pair of speakers [​IMG], but snapped out of it before I spent anywhere near that much. Then a few years later at my 2nd job, I inadvertantly triggered the audiophile itch in a coworker who did end up spending that much on his stereo upgrade--and the thing w/ it is that you can spend 10K even on a mostly used stereo setup and still not reach the really high-end level.

    Anyway, I hope you'll get a good job so you can pay for all of it. Maybe you should take a long break from these forums...

    _Man_
     
  11. John-Miles

    John-Miles Screenwriter

    Joined:
    Nov 29, 2001
    Messages:
    1,216
    Likes Received:
    3
    Trophy Points:
    110
    hahaha no I love this fourm too much to stop now. Although i guess i should also mention that I am doing mechnaical engineering, and we have workterms in this program, so I am actually getting paid full time for part of every year. Actually right now im working for an Oil Company [​IMG] so thats why im getting yamaha s2300.... and a new receiver [​IMG]

    See I told you i was sick... i get money and away it goes to more HT gear... :b
     

Share This Page