专利名称：APPARATUS FOR REMOVING GHOST
IMAGES
发明人：SAITO, Junya,YAMADA, Hisafumi,TSUTSUI, Ichiro
申请号：EP84902052.4
申请日：19840516
公开号：EP0143854B1
公开日：
19920415
专利内容由知识产权出版社提供
摘要：An apparatus for removing ghost images includes a transversal filter which is provided with signal delay circuits (8).(11); weighting circuits (91) to (9n), (12,), to (12m) each connected to taps of the signal delay circuits (8), (11); demultiplexer delay circuits (19), (20); and switching circuits (21,) to (21n), (22,) to (22m) and memory circuits (24,) to (24n), (25,) to (25m) which are connected between taps of the demultiplexer delay circuits (19), (20) and corresponding weighting circuits (9,) to (9n), (12,) to (12m). The transversal filter is connected to a video signal source (4), and forms a ghost-exorcising signal which is output to a synthesizer circuit (6) where it is combined with a video signal from the video signal source (4). In addition, a circuit is provided which detects at least the ghost level in the video signal from the synthesizer circuit (6) during a predetermined period after a reference time, and the output of the detector circuit is supplied to the demultiplexer delay circuits. The ghost-level detector circuit is provided with a circuit (35) which forms masking puls including the reference time, a circuit (36) which detects the reference time from the masking puls, a circuit (15) which forms a standard waveform from the output of the reference time detector circuit (36), a circuit (13i which substracts
the standard waveform from the video signal from the synthesizer circuit (6), and a circuit (17) which detects the ghost level from the output of the subtractor circuit (13). A signal indicating the detection of the leading edge of each masking pul is supplied to the demultiplexer delay circuits (19), (20) as a pilot pul. The pilot pul is detected from that signal passing through the demultiplexer delay circuits (19), (20), and the operations of the switching circuits (21,) to (21n), (22,) to (22m) are controlled on the basis of the thus-detected signal. The apparatus makes it possible to provide excellent weighting with a simple construction.
申请人：SONY CORPORATION
地址：7-35 KITASHINAGAWA 6-CHOME SHINAGAWA-KU; TOKYO 141
代理机构：Cotter, Ivan John
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