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Thread: NOKIA DTC4 or DTC3 or DTC2

  1. #1
    neves is offline Registered User
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    NOKIA DTC4 or DTC3 or DTC2

    sorry for my question but what kind of cells are NOKIA DTC4 or DTC3 or DTC2...
    What means NOKIA DTC4 or DTC3 or DTC2
    Last edited by neves; 04-10-2005 at 01:49 PM.

  2. #2
    mestrini's Avatar
    mestrini is offline Moderator
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    FAQ:
    Q- What are DCTx?:
    A- DCT means Discrete Cosine Transform and they are a series of 8 complex math algorithms used in signal processing
    Another important class of transforms consists of the 8 different types of discrete cosine and sine transforms (DCTs and DSTs), respectively, also called discrete trigonometric transforms (DTTs). Their applications include image and video compression,
    From the table bellow you can see the complexity of the maths envolved in all the 16 DTTs

    So, until now Nokia has used three algorithms in their phones (DCT2 ->3110, DCT3 ->3310, DCT4 ->8310) but i would have to be a mathematician to understand the complexity of it all and to know if they're using another algo or will use in the future

    So the best i can offer now is an old list i got with different kinds of nokia models but my advise is to use a search engine to find if is there any site with a full list of all versions of nokia phones

    cheers
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  3. #3
    NokDoc's Avatar
    NokDoc is offline Super Moderator
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    Wow,

    Hidden talents...

    I think it's quite complex to understand, although one can never learn better as by the direct root.

    NokDoc
    U can checkout anytime U like, but U can never leave!

  4. #4
    EdgeCrusher is offline Super Moderator
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    Mr. mestrini, excellent.

    I'll try to explain that briefly... in fact I'll pass this to my old man (ex math professor at university, I followed a radically different path ). If he explains that, I'll post the explanation here.

    As soon as I got some news, will post here.

    Cheers
    Edge

    edit: I hope 'k', 'l' and 'n' are constants and not variables, since is they're variables there are gonna be some troubles...
    Last edited by EdgeCrusher; 04-10-2005 at 06:51 PM.

  5. #5
    mestrini's Avatar
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    well, if u want more i have some pdf documents that explain it very thoroughly

    just ask

    cheers
    searching and asking won't kill you, will only make you wiser (please search before you ask! )
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    Asking how is like traveling the entire space in 3 seconds. (Nokdoc)

  6. #6
    EdgeCrusher is offline Super Moderator
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    Sure! I think you've got my mail... if you have not, I'll send it, just tell me.

    Cheers
    Edge

  7. #7
    mestrini's Avatar
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    files

    Since more than one member requested me the files i think it's better to upload them here

    but notice that these documents aren't the holy graal of DCTx reversing ; they are study papers of some mathematicians and therefore the contents aren't directed to nokia phones but to math formulas instead

    anyway, blow your neurons

    cheers
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    searching and asking won't kill you, will only make you wiser (please search before you ask! )
    -------------------------------------------------------------
    Asking how is like traveling the entire space in 3 seconds. (Nokdoc)

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