JPH0268567U

JPH0268567U -

Info

Publication number: JPH0268567U
Application number: JP14868488U
Authority: JP
Priority date: 1988-11-15
Filing date: 1988-11-15
Publication date: 1990-05-24

Description

[Brief explanation of drawings]

第１図は第１の考案の一実施例のタツプ係数発
生部を示す構成図、第２図は第２の考案の一実施
例のタツプ係数発生部を示す構成図、第３図はゴ
ースト除去装置の一例の構成図である。１，２１……入力端子、２……乗算器、３，４
，１９，２２……加算器、５，７……切換スイツ
チ、６……タツプ係数メモリ、８……絶対値変換
回路、９，１５……比較器、１０，１４，１７，
２０……アンド回路、１１……零検出回路、１２
……符号検出回路、１３……データセレクタ、１
６……符号メモリ、１８……カウント数メモリ、
２３……トランスバーサルフイルタ、２４……出
力端子、２５……ゴーストキヤンセル基準信号抽
出回路、２６……減算器、２７……基準波形発生
部、２８……タツプ係数発生部。 Fig. 1 is a block diagram showing the tap coefficient generation section of an embodiment of the first invention, Fig. 2 is a block diagram showing the tap coefficient generation section of an embodiment of the second invention, and Fig. 3 is a ghost removal FIG. 1 is a configuration diagram of an example of a device. 1, 21... Input terminal, 2... Multiplier, 3, 4
, 19, 22... Adder, 5, 7... Changeover switch, 6... Tap coefficient memory, 8... Absolute value conversion circuit, 9, 15... Comparator, 10, 14, 17,
20...AND circuit, 11...Zero detection circuit, 12
...Sign detection circuit, 13...Data selector, 1
6... code memory, 18... count number memory,
23...Transversal filter, 24...Output terminal, 25...Ghost cancel reference signal extraction circuit, 26...Subtractor, 27...Reference waveform generation section, 28...Tap coefficient generation section.

Claims

[Claims for Utility Model Registration] (1) Obtaining an output video signal by subtracting a ghost cancellation signal formed by a transversal filter from an input video signal, and adding an error signal between the output video signal and the ghost cancellation reference signal. In the ghost removal device, the tap coefficient of the transversal filter is sequentially corrected in accordance with the above-described ghost removal device, comprising: absolute value detection means for detecting that the magnitude of the error signal is not zero and is less than or equal to a predetermined value; a code detecting means for detecting the sign of the ghost, and quantitatively correcting the tap coefficient based on the output signals of the absolute value detecting means and the sign detecting means. (2) Obtain an output video signal by subtracting the ghost cancellation signal formed by the transversal filter from the input video signal, and tap the transversal filter according to the error signal between the output video signal and the ghost cancellation reference signal. A ghost removal device in which coefficients are sequentially corrected, comprising: absolute value detection means for detecting that the magnitude of the error signal is not zero but less than or equal to a predetermined value; and sign detection means for detecting the sign of the error signal. and a counting means for counting the number of times that the detection output from the absolute value detection means is continuously outputted without changing the detected sign by the sign detection means at a location corresponding to the same tap coefficient, A ghost removal device characterized in that when a count value by a counting means reaches a predetermined value, a corresponding tap coefficient is quantitatively corrected.