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Abstract

A video signal processing circuit carries out error correction, error concealment and weighted mean processing sequentially on video signals reproduced by a video tape recorder. One and two dimensional error concealment modes are provided respectively utilizing sample data on the same line as erroneous sample data to be concealed, and sample data in peripheral and/or time displaced relation to the erroneous sample data. One of a plurality of error concealment modes is selected depending upon the state of error flags for the peripheral and/or time displaced sample data. In certain advantageous embodiments, original sample data for which a gray code has been set, is compared with error concealed data and the original sample data is output in place of the error concealed data where such comparison indicates that the difference between the two is within a predetermined acceptance threshold. Weighted mean sample data processing provides the capability of producing a first field of a video signal from a second field thereof by summing sample data from a plurality of lines of the second field to form the signals of the first field. In certain advantageous embodiments, the signals of the second field are multiplied by selectably variable coefficients, the selection of which is based on a detection that at least one of the line signals of the second field is outside an effective image information portion thereof.

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First Claim