[1] : The Free On-line Dictionary of Computing (27 SEP 03)

phase alternating line
     
         pal the video signal format used in the uk
        where else?.
     
        pal uses amplitude modulation for the video information, and
        frequency modulation for the audio information.  the phase
        of the colour subcarrier is reversed on alternate lines
        which together with the use of a delay line allows the
        receiver to cancel any phase errors introduced in the path
        between the studio and the end-user's receiver.  such phase
        errors are quite common and would cause the displayed colours
        to shift in hue.
     
        the us equivalent, ntsc, does not have this feature and thus
        requires a user control to correct for transmission phase
        errors, hence the mis-expansion "never twice the same colour".
     
        2001-06-08
     
     
see also:
video amplitude modulation frequency modulation audio colour subcarrier hue 
ntsc 

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