Ghost cancelling method and apparatus using canonical signed dig

Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction

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H04N 5213

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056233183

ABSTRACT:
A ghost canceler uses a filter coefficient represented in canonical signed digit code to cancel a ghost of a video signal. The ghost cancelling apparatus includes an input end for receiving a ghost-containing video signal, a separation and storage portion for separating a transmitted ghost cancelling reference (GCR) signal from the video signal received via the input end, and storing the separated GCR signal therein, a controller for receiving the GCR signal stored in the separation and storage portion to detect a characteristic of a channel through which the video signal is transmitted, and generating canonical signed digit (CSD) filter coefficient values represented in the form of CSD codes on the basis of the detected channel characteristic, and a filter for cancelling a ghost component contained in the video signal received via the input end on the basis of the CSD filter coefficient values generated by the controller, and outputting the ghost-cancelled video signal. This arrangement allows a smaller amount of hardware to be used than in an existing ghost canceler while providing similar ghost cancelling performance.

REFERENCES:
patent: 4953026 (1990-08-01), Kobayashi
patent: 5361102 (1994-11-01), Roy
patent: 5389977 (1995-02-01), Lee
A Tutorial On Ghost Cancelling In Television Systems (IEEE Transactions On Consumer Electronics, vol. CE-25, pp. 9-44, Feb., 1979, by W. Ciciora, G. Sgrignoli and W. Thomas).
Training Signal and Receiver Design For Multi-Path Chanel Characterization For TV Broadcasting (IEEE Transactions On Consumer Electronics, vol. 36, No. 4, pp. 794-806, Nov., 1990, by J.D. Wang, T.H.S. Chao and B.R. Saltberg).
Development Of A Ghost Cancel Technology For TV Broadcasting (1990 NAB Engineering Conference Proceedings, pp. 229-238, 1990, by Shigeo Matsuura et al).
Ghost Cancelling: A New Standard for NTSC Broadcast Television ((IEEE Transactions on Broadcasting, vol. 38, No. 4, pp. 224-228, Dec. 1992, by Lynn D. Claudy and Stephen Herman).
Signed Digit No. Representation for Fast Parallel Arithmetic (IRE Transactions On Electronic Computers, vol. EC-10, pp. 383-400, Sep., 1961, by Algirdas Avizenis).
An Improved Search Algorithm For The Design Of Multiplierless FIR Filter With Power-of-two Coefficients (IEEE Transactions On Circuit And Systems, vol. 36, No. 7, pp. 1044-1047, Jul., 1989).

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