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C1851BCU Datasheet(PDF) 20 Page - NEC |
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C1851BCU Datasheet(HTML) 20 Page - NEC |
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20 / 60 page  20 µPC1851B Data Sheet S13417EJ2V0DS00 2.3 dbx Noise Reduction Block All the filters required for TV-dbx Noise Reduction are incorporated. These filter responses are adjusted by setting all the FILTER SETTING bits (Write register, subaddress 02H, bits D0 to D5). (1) LPF This LPF has traps at fH and 24 kHz each. The fH trap filter minimizes interference by the fH signal which is not synchronized with the pilot signal (for example, leakage of the synchronous idle and buzz from the video signal). (2) 408-Hz LPF This filter is a de-emphasis filter. Its transfer function is as follows: f 1 + j 5.23k T(f) = f 1 + j 408 (3) Variable Emphasis It is also called the spectral VCA. It is controlled by the spectral RMS. The transfer function is as follows: f 1 + 51b 1 + j x 20.1k b + 1 S–1 (f, b) = f 1 + 51 1 + j x 20.1k b + 1 where “b” is the variable transferred from the spectral RMS for controlling. (4) Wide-band VCA A VCA whose operating frequency range is mainly low to mid frequencies and controlled by the wide-band RMS. The transfer function is as follows: W–1 (a) = a where “a” is the variable transferred from the wide-band RMS for controlling. (5) 2.19-kHz LPF This filter is a de-emphasis filter. Its transfer function is as follows: f 1 + j 62.5k T(f) = f 1 + j 2.19k (6) Spectral RMS Filter A filter that limits the band width of the signal input to the RMS which controls the variable emphasis. The transfer function is as follows: ff ( j ) 2 j 7.66k 3.92k T (f) = x ff f 1 + j + ( j ) 2 1 + j 7.31k 7.66k 3.92k |
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