Direct memory access control device for use in teletext signal r

Details Direct memory access control device for use in teletext signal r Direct memory access control device for use in teletext signal r

1985-12-27

1987-04-14

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358148, H04N 708

Patent

active

046582940

ABSTRACT:
A direct memory access control device as a part of a teletext adaptor is equipped with a data separating element, a data receiving element including an improved direct memory access control device as a part, and a data processing element. The direct memory access control device comprises a serial/parallel convertor, a D-flip flop, an OR gate, a byte synchronization detector, a multivibrator, a 4 division counter, a 8 division counter, a 64 division counter, a RAM, a multiplexer and so forth. The teletext data can be stored in RAM. During an interval between the remaining video signal periods, the microprocessor can process signals so that all the elements may be simplified and the cost entailed therefore may be lowered accordingly.

REFERENCES:
patent: 4577227 (1986-03-01), Gurumurthy
"Wireless World Teletext Decoder 1-The Background", by Philip Darrington, Wireless World, vol. 81, No. 1479, pp. 498-504, 11/75.

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