Method and apparatus for validating teletext data

Details Method and apparatus for validating teletext data Method and apparatus for validating teletext data

1989-05-23

1990-10-16

Shepperd, John W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358142, H04N 7087, H04N 708

Patent

active

049639684

ABSTRACT:
A teletext decoder comprises a validation circuit for affording an output (V) when valid teletext data pulses are received. The validation circuit comprises an error checking circuit (SR, FCCC, MDCC, RACC) for affording outputs indicative of the number of errors existing in data pulses corresponding to a Framing Code, and Hamming protected magazine and row address data, and a validation check circuit (A, VCC) for affording an output V indicative of valid teletext data having been received when the combined total of said errors does not exceed one.

REFERENCES:
patent: 4577227 (1986-03-01), Guramarthy
patent: 4593374 (1986-06-01), Gurumarthy
patent: 4698677 (1987-10-01), Kinghorn et al.
Mullard Dat Sheet SAA5040 Series Teletext Acquisition and Control Circuit, Jun. 1981.
"Wireless World Teletext Decoder"; Daniels; Wireless World, vol. 81, No. 1480, Dec. 1975, pp. 563-566.
"Teletext Data Decoding-The LSI Approach"; Norris et al., IEEE Transactions on Consumer Electronics, vol. CE-22, No. 3, Aug. 1973, pp. 247-253.
"Broadcast Teletext Specification"; BBC, Sep. 1976.

Affiliated with

Also associated with

Rating

Method and apparatus for validating teletext data does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-853737