Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1988-05-16
1990-03-27
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 36, 358905, H04N 521
Patent
active
049125575
ABSTRACT:
A method for controlling reduction of a ghost image present in a main path baseband television video signal includes the steps of deriving a main path reference pulse and ghost image of the pulse from a successive series of pulses and ghost images of the pulses present during the vertical blanking interval of a present field of the video signal, the derived ghost image having an amplitude less than the amplitude of the derived main path reference pulse; replicating the derived reference pulse and ghost image at a predetermined repetition rate substantially throughout the useful picture area of the present field interval; generating a signal used for correlation which is delayed in time from the occurrence of the beginning of the present video field; correlating the replicated ghost image with the signal used for correlation to ascertain a location of coincidence in order to provide a correction pulse indicating the delay period and amplitude of the ghost image of the pulse; generating at least two control signals respectively related to the correction pulse: establishing a ghost reduction network structure for the present field in response to the two said control signals and maintaining the established structure throughout the present field and until the ghost reduction network structure is reestablished by the foregoing steps during subsequently occurring fields; and, passing the main path baseband television video signal through the network during the present field and combining a function related to determined amplitude and delay period of the ghost image with the baseband television video signal in order to reduce the amplitude of the ghost image present in the video signal.
REFERENCES:
patent: 4364092 (1982-12-01), Holmes
patent: 4371266 (1983-02-01), Holmes
patent: 4393397 (1983-07-01), Holmes
A Digitalized Automatic Ghost Canceller, Murakami, Ohzecki, Ogi, Toshiba Research and Development Center, Toshiba Corporation, Kawasaki, Japan, received Jul. 3, 1979, 1979 IEEE.
A Tutorial on Ghost Cancelling in Television Systems, Ciciora, Sgrignoli, Thomas, Zenith Radio Corporation, Glenview, Ill. 60025, received Jan. 12, 1979, 1979 IEEE.
Performance Evaluations of Selected Automatic Deghosting Systems for Television, Goyal, Armfield, Geller, Blank, GTE Laboratories Inc., 40 Sylvan Road, Waltham, Mass. 02154, IEEE Transactions on Consumer Electronics, vol. CE-26, Feb. 1980.
A Novel Automatic Ghost Canceller, Makino, Murakami, Sakurai, Ohnishi, Obara, Toshiba Research and Development Center, Kawasaki, Japan, 1980 IEEE.
Ghost Clean System, Murakami, Iga, Takehara, Toshiba Corporation, Kanagawa, Japan, 1983 IEEE, received 6/17/83.
Adaptive Multipath Equalization for T.V. Broadcasting, Thedick, Public Broadcasting Service, 475 L'Enfant Plaza, S.W., Washington D.C. 20026, received Mar. 22, 1977, IEE Transactions on Consumer Electronics, 5/1977.
Ghost Reduction System for Television Receivers, Yamamoto, Yamaguchi, Miyata, Television Engineering Center, Matsushita Electric Ind. Co., Ltd., Matsushita-cho, Ibaraki, Osaka, Japan, received Jul. 29, 1977, IEEE vol. CE-23, No. 3, 8-77.
A Fully Automatic Ghost Canceller, Makino, Sakurai, Iwasawa, Ohnishi, Murakan, Miura, Toshiba R & D Center, Toshiba Corp., Kawasaki, Japan, received Jun. 24, 1978, IEEE Transactions on Consumer Electronics, vol. CE-2, No. 3, Aug. 1978.
Advanced Digital Television System, Yip, Kongable, Motorola, Inc., Semiconductor Products Sector, MD 56-122, Phoenix, Ariz. 85018, received Aug. 5, 1986, IEEE Transactions on Consumer Electronics, vol. CE-32, No. 4, Nov. 1986.
Practical TV Ghost Canceller Using Two-Stage CCD Transversal Filter, Murata, Kazumi, Kondo, Abe, Horino, Hitachi Consumer Products Research Center, Yokohama, Japan, Hitachi Mussashi Works, Tokyo, Japan, ICCE 83/6/9/83.
Chin Tommy P.
Harrison David B.
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