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    • 10. 发明专利
    • NOISE REDUCTION DEVICE
    • JPS5511678A
    • 1980-01-26
    • JP8494278
    • 1978-07-11
    • JAPAN BROADCASTING CORPMATSUSHITA ELECTRIC IND CO LTD
    • MURAKAMI KEINOSUKEENAMI KAZUMASAMOTOTANI KUNIHIKOOKADA TADASHI
    • H04N5/21
    • PURPOSE:To obtain a noise reduction device to ensure a high-quality picture by detecting the difference between the signal of the specified frame of the TV signal and the 1-frame preceding signal and then giving control after counting the number of signals whose absolute value are more than the set level. CONSTITUTION:Difference signal M is obtained through detection circuit 3 between signal A of the present frame and signal B preceding by one frame, and the absolute value ¦M¦ is obtained through absolute value circuit 12. Value ¦M¦ is then supplied to mixture ratio generation circuit 13 to produce constant K as well as supplied to comparator 14 to be compared with set value D. In circuit 14, the absolute value larger than value D is supplied to counter circuit 15 where the units of ¦M¦ larger than D and counted. And the count output is supplied to mixer ratio control circuit 16 along with the output circuit 13. Circuit 16 reduces forcedly the value of K of mixture in case the output of circuit 13 is large on the screen featuring a big motion in order to lower the degree of improvement for S/N but with reduction given to the lowering of resolution. And in case the output of circuit 15 is small on the screen featuring a large still part, the improvement degree of S/N caused by K is increased in order to reduce the noise for a high picture quality.