Matsushita Electric Industrial Co., Ltd.

Sachiko Nishii

Yukihiro Yagi

Hisao Kobayashi

Katsuhiko Hashimoto

Masakazu Urade

A circuit and method of data slicing a television signal comprises: an extractor 2 for extracting a specific component from the television signal of analog form; a slicer 3 for slicing the specific component of the television signal produced by the extractor 2 and converting it to its digital form; a decoder 4 for decoding an output of the slicer 3 for display; an initial value storage 10 for storing an initial value of the slice level; slice level controllers 7 and 8 for varying the initial slice level at a predetermined rate; a signal detector 11 for examining whether or not the digitized specific component from the slicer 3 is a desired multiplex signal; a temporary slice level memory 13 for storing the upper and lower levels of the desired multiplex signal detected by the signal detector 11; a calculator 9 for calculating an optimum value of the slice level from the upper and lower levels of the multiplex signal stored in the temporary slice level memory 13; a slice level storage 6 for storing the optimum slice level calculated by the calculator 9; and a controller 14 for selectively feeding the slicer 3 with the optimum slice level retrieved from either the slice level storage 6 or the slice level controllers 7 and 8 according to a resultant judgment of the signal detector 11.

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Kyoto, Japan

Sachiko Nishii