Conference hydra::amiga_v1

2758.0. "Video Digitizers" by STKAI2::SMEDBERG () Mon Jul 24 1989 08:52

    Datel-Video Digitizer!!!
    ------------------------
    
    What is it!? Is it a good Digitizer???
    Is it compatible with Digiv. software???
    
    It must be easy to make the hardware to them!, why well they must
    be using cheap A/D-Converters. Becaus they sample the signal sequencial
    or some thing like that, there for they can't sample from a VCR
    direct......
    Am i wrong??
    
    I have a theory about how it works i think they use 7 bits for the
    video signal and 1 bit for picture sync and line sync.
    Then you just have to wait fore the sync signals and sample a little
    bit of infomation on each line, and then procedure to the whole
    the picture are digitized.
    
    It would work properly i think!
    Some other way to digitize a picture would be to use a DMA line
    and do it all in real time, that would be some thing....
    
    Ex.
    ---
    
                                   Video Signal
            5v   !                 ------------
             I-> !           !!      !      !!!      !       !!
    Bit      I   !   !      !  !    ! !    !   !    ! !     !  !
    1-7   ---I   !    !    !   !   !   !   !   !   !   !   !   !
             I   !     !  !     ! !     ! !     ! !     ! !    !
             I-> !     !  !     ! !     ! !     ! !     ! !     ! !
    Bit 0 -----> !      --       -       -       -       -       -
    I       0v   !______I________I_______I_______I_____________________
    I                   I        I       I       I
    I                   I        Line Sync 
    I                   Picture Sync
    I
    Picture Sync & Line Sync for timing to start Digitizing!
        
    Is it right or wrong? Give me a hint some one!!!
    
    
                                           
    Johsm....