Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1980-01-24
1982-06-01
Ng, Jin F.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358167, H04N 514, H04N 704
Patent
active
043331092
ABSTRACT:
An equalizer and decoder system compensating for multipath distortion in digital format signals sent by teletext, for example. The system loads demodulated data signals and a received reference signal into a charge coupled device clocked in real time by a clock circuit. Later, the reference pulse is clocked to a microprocessor which determines tap coefficients for a transversal filter to correct the multipath distortion in the reference signal. The data signals are then applied to a transversal filter weighted with the calculated tap weights. After filtering, signals are decoded by the microprocessor.
In another embodiment a charge coupled device with tapped stages is used at one time for receiving the data signals in real time, and at a later time for part of a transversal filter.
In a simplest embodiment, distortions are removed by the microprocessor itself, without any separate transversal filter.
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patent: 3283063 (1966-11-01), Kawashima et al.
patent: 4044381 (1977-08-01), Shimano et al.
patent: 4091418 (1978-05-01), Ciciora
Goyal and Armfield, "Reception of Teletext Under Multipath Conditions", IEEE Transactions on Consumer Electronics, Jul. 1979.
Ciciora et al., "Tutorial on Ghost Cancelling in Television Systems", IEEE Transactions on Consumer Electronics, Feb. 1979.
Thedick, "Adaptive Multipath Equalization for TV Broadcasting", IEEE Transactions on Consumer Electronics, May 1977.
Lucky, "Automatic Equalization for Digital Communication", B.S.T.J., Apr. 1965.
Lucky, "Techniques for Adaptive Equalization of Digital Communication Systems", B.S.T.J., Feb. 1966.
"This is Oracle", a brochure.
"Teletext", a brochure.
Ciciora et al., "An Introduction to Teletext and Viewdata with Comments on Compatibility".
Neal and Goyal, "A Frequency Domain Interpretation of Echos and Their Effect on Teletext Data Reception".
Suzuki et al., "Television Receiver Design Aspects for Employing Teletext LSI", IEEE Transactions on Consumer Electronics, Jul. 1979.
"Multitext-Signetics Technical Information", Mullard, 1978.
Coult John
Kail Jack
Ng Jin F.
Zenith Radio Corporation
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