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Networking malarky. Anybody help?

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  • 09-01-2006 3:51pm
    #1
    kaimera
    Closed Accounts Posts: 16,396 ✭✭✭✭


    A digitized TV picture is to be transmitted from a source that uses a matrix of 1280 x 1024 pixels. Each pixel's intensity is one of 64 possible values. Assume 25 frames are transmitted per sec. The link to the destination consists of a 4.5MHz channel, where the signal-to-noise ratio is 35 db. Will the channel be able to carry the transmission?

    right, work out the datarate and work out the channel capacity. Simple.

    have the channel capacity but from the one tutorial example I have, i can't figure the datarate.

    the eg I have has a matrix of 480x500, 32 possible values, 30fps.
    the answer we got is 
    (12*10^5 bits)*30 == 36*10^6
    wish the calculator would work right at times. fs. I need sleep..

    where'd the 12 come from? :confused:

    just need to figure that out.

    next question has a matrix of 1024*768, 8 values, 25 fps.

    channel capacity is the same for all with 4.5Mhz and 35db S/N.

    Any nudge in the right thinking is much appreciated. :)


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    #2
    kaimera
    Closed Accounts Posts: 16,396 ✭✭✭✭kaimera


    anybody anywhere? :-/


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    #3
    Peteee
    Moderators, Education Moderators Posts: 2,432 Mod ✭✭✭✭Peteee


    Try the net/comms board! :v:

    Also it's 'malarky'..... ass


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    #4
    kaimera
    Closed Accounts Posts: 16,396 ✭✭✭✭kaimera


    Peteee wrote:
    Try the net/comms board! :v:

    Also it's 'malarky'..... ass


    foad.

    spam elsewhere kiddy.

    I'm not gonna post a duplicate thread. f00.


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    #5
    Mr. CooL ICE
    Registered Users Posts: 17,595 ✭✭✭✭Mr. CooL ICE


    Damn right! Remember, although ComSys people are everywhere here, is is not a ComSys board, this is the UL board!

    Theres as much room for this thread as there is for someone asking about magic mushroom shops.


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    #6
    kaimera
    Closed Accounts Posts: 16,396 ✭✭✭✭kaimera


    it not necessarily a comp sys thread tbh.

    networking is in enough IT courses for somebody to help here.

    Nuke, when ya get here, copy it to Networking?


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    #7
    kodute
    Registered Users Posts: 829 ✭✭✭kodute


    kaimera wrote:
    enough IT courses for somebody to help here.


    Excuse me! your course may be only an "IT" course but real courses (engineering) are so much more than that.

    All this aside if the TV picture is at 1280x1024 then your laughing, if not change the channel...:v:


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    #8
    KerranJast
    Registered Users Posts: 1,829 ✭✭✭KerranJast


    the eg I have has a matrix of 480x500, 32 possible values, 30fps.
    the answer we got is
    Code:
    (12*10^5 bits)*30 == 36*10^6[or 10^7 when done correctly.]

    where'd the 12 come from?

    just need to figure that out.

    the 12 came from:

    480x500=no of pixels per frame=240,000
    each pixel can be one of 32 possible values. 32 is 2^5.

    240,000 * 5 = 12*10^5. QED.


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    #9
    kaimera
    Closed Accounts Posts: 16,396 ✭✭✭✭kaimera


    KerranJast, thanks.

    All I wanted :)

    now to return to jesting about engis :v: real course my ass :p


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