Invention Application
WO2004077836A1 COLOUR DECODING CIRCUITRY FOR A VIDEO SIGNAL 审中-公开
视频信号的彩色解码电路

COLOUR DECODING CIRCUITRY FOR A VIDEO SIGNAL
Abstract:
The invention is related to a receiver for a television signal, such as a PAL signal, the receiver comprising a color information retrieving unit (8, 9, 11, 13) arranged to separate color information from a composite signal to retrieve color information. The receiver contains a filter (13) for selecting the decoded color signal from a plurality of signals, under control of a first value (b) of the color information from the central linerelative to second and third values (a, c) of the color information at corresponding position on further lines at an odd number of lines from the central line on a first and second, mutually opposite side of the central line respectively. An average is selected in which the first value (b) is weighed equally with information from a line or lines at an odd number of lines from the central line, when the first value (b) is more than a predetermined factor outside a range between the second and third value (a, c). A signal derived from the color information is selected in which at least no information (a, c) is weighed from the first or second side when the first value (b) is in the range or less than said factor outside the range and closer to the third or second value (a, c) respectively.
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