Intelligent teletext decoder

Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

358160, 358167, H04N 514, H04N 704

Patent

active

044491450

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.

REFERENCES:
patent: 3283063 (1966-11-01), Kawashima
patent: 4032762 (1977-06-01), Caloyannides
patent: 4044381 (1977-08-01), Shimano
patent: 4091418 (1978-05-01), Ciciora
Adaptive Multipath Equalization for T.V. Broadcasting, by Henry Thedick, IEEE Transactions on Consumer Electronics, May 1977, pp. 175-181.
A Tutorial on Ghost Cancelling in TV System, by W. Ciciora et al., IEEE Transactions on Consumer Electronics, Feb. 1979, pp. 1-35.
Reception of Teletext under Multipath Conditions, by S. Goyal, IEEE Transactions on Consumer Electronics, Jul. 1979.
Multitext-Signetics Technical Information, by Mullard, 1978.
Teletext and Viewdata Costs as Applied to the U.S. Market, by Crowther, IEEE Transactions on Consumer Electronics, vol. CE-25, No. 3, Jul. 1979, pp. 339-344.
Automatic Equalization for Digital Communication, by R. W. Lucky, B.S.T.L., vol. XLIV, pp. 547-588, Apr. 1965.
Techniques for Adaptive Equalization of Digital Communication Systems, by R. Lucky, The B.S.T.J., Feb. 1966, pp. 255-286.
This is Oracle, IBA Engineering Information Service, Oct. 1977.
Teletext, a Brochure, May 1979.
A Frequency Domain Interpretation of Echos and Their Effect on Teletext Data Reception, by Neal & Goyal, pp. 1 to 16.
An Introduction to Teletext and Viewdata with Comments on Compatibility, by Ciciora et al., pp. 1 to 8.
Television Receiver Design Aspects for Employing Teletext LSI, by T. Suzuki et al., IEEE Transactions on Consumer Electronics, vol. CE-25, No. 3, Jul. 1979, pp. 400-405.
Teletext/Viewdata LSI, by Brian Harden, IEEE Transactions on Consumer Electronics, vol. CE-25, No. 3, Jul. 1979, pp. 353-358.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Intelligent teletext decoder does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Intelligent teletext decoder, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Intelligent teletext decoder will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-848335

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.