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25Hz and 50Hz

  • 15-07-2010 10:07pm
    #1
    egal
    Registered Users, Registered Users 2 Posts: 377 ✭✭


    I have a Sony W series TV. When tuned to a Freeview channel, if I press the "i" button I get an information screen telling me that the picture I am seeing is 576/25Hz.

    My brother has a Sony BX series TV. When the corresponding button is pressed, his information screen indicates 576/50Hz.

    I am confused. :confused: Can anyone explain what the difference is?

    Or, more to the point, WHY is there a difference?


Comments

  • #2
    watty
    Registered Users, Registered Users 2 Posts: 32,417 ✭✭✭✭watty


    All broadcast TV in all of Europe is Interlaced.

    It's 50 fields a second each with odd or even lines from the total 576 lines (regular) or 1080 lines (HD). So it's 25 full frames of all the lines a second.
    (Analogue uses 625 lines, but only about 576 are used for picture).

    So they could be counting different stuff.

    Also one of them might be de-interlacing or a so-called 100Hz TV.


  • #3
    pa990
    Registered Users, Registered Users 2 Posts: 3,883 ✭✭✭pa990


    my sony tv (200hz model) displays
    576/25 for RTE1, 2, RTENews, TG4, Rtenl 1

    For RTENL2
    1080/25


  • #4
    kuro_man
    Registered Users, Registered Users 2 Posts: 1,037 ✭✭✭kuro_man


    576i/50 shows 50 1/2 frames per second (interlaced)
    576p/25 shows 25 full frames per second (progressive)


  • #5
    watty
    Registered Users, Registered Users 2 Posts: 32,417 ✭✭✭✭watty


    But all broadcast transmission is 576i or 1080i here.


  • #6
    slicedpanman
    Registered Users, Registered Users 2 Posts: 619 ✭✭✭slicedpanman


    egal wrote: »
    My brother has a Sony BX series TV. When the corresponding button is pressed, his information screen indicates 576/50Hz.
    kuro_man wrote: »
    576i/50 shows 50 1/2 frames per second (interlaced)
    576p/25 shows 25 full frames per second (progressive)
    watty wrote: »
    But all broadcast transmission is 576i or 1080i here.

    Was your brother watching a DVD when he pressed the button?

    Edit: sorry my comment doesn't make sense... I misread the above and thought that your brother was getting 576p so thought maybe he was watching a DVD - didn't realise that it appears that you are getting 576p on a broadcast channel


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