Timing control signal generator for teletext signal waveform equ

Details Timing control signal generator for teletext signal waveform equ Timing control signal generator for teletext signal waveform equ

1985-02-14

1986-11-25

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358148, 358905, 333 18, H04N 7087

Patent

active

046252410

ABSTRACT:
A timing control signal generator used in a Teletext signal waveform equalizer to remove waveform distortions in a Teletext signal inserted into a horizontal scanning line for a vertical blanking interval of a television signal and arranged to generate timing control signals for controlling the operation of the waveform equalizer. The timing of each of the timing control signals, at which the level variation thereof occurs, is predetermined. To generate these timing control signals by a small scale circuit arrangement, a pair of counters and a pair of read only memories are used. The first counter is cleared by a field start signal and counts sample clock pulses synchronized with the Teletext signal. The first ROM stores information indicative of level changes of the timing control signals and is accessed by the first counter. The level change information read out from the first ROM is counted by the second counter. The second counter accesses the second ROM which stores level information of the timing control signals at the level change timing of at least one of the timing control signals. The level information of the timing control signals read out from the second ROM is held in a latch circuit, thereby producing the timing control signals.

REFERENCES:
patent: 4202012 (1980-05-01), Hirashima
patent: 4303895 (1981-12-01), Ohnishi et al.
"A One-Chip Automatic Equalizer for Echo Reduction in Teletext", by Voorman et al, IEEE Transactions on Consumer Electronics, vol. CE-27, No. 3, Aug. '81, pp. 512-529.
Rolf Deubert, "Feature IC's for Digivision TV Sets", IEEE Trans. on Consumer Electronics, vol. CE-29, No. 3, Aug. 1983, pp. 237-241.
Elektronik, No. 26, Dec. 30, 1983, Munich; J. O. Voorman et al, "Integrierter Echokompensator fur Videotext", pp. 60-64.

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