Filter circuit

Abstract

PURPOSE: To process a luminance signal with one delay circuit only and to simplify the constitution by applying vertical pre-emphasis processing or vertical de-emphasis processing to a luminance signal, suppressing a signal component of a chroma band, and applying the vertical de-emphasis processing when required. CONSTITUTION: Comb line filter circuits 4, 5 and chroma signal band attenuation filter circuits 32, 34, 36 are provided, which suppress the signal component of the chroma band as to a luminance signal SYIN(SDEM) based on the output signal SYEN of the comb line filter circuits 4, 5. Moreover, based on the output signal SYEN of the comb line filter circuits 4, 5, noise reduction filter circuits 6, 7, 8 emphasizing or suppressing the luminance signal SYIN(SDEM) are provided. Thus, the luminance signal SYIN is processed by one delay circuit only and the constitution of the signal processing circuit is simplified more of the share of processing. COPYRIGHT: (C)1991,JPO&Japio

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