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phase alternating line
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phase alternating line : FOLDOC
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)



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