Arrangement for receiving numerical data, comprising a circuit f

Details Arrangement for receiving numerical data, comprising a circuit f Arrangement for receiving numerical data, comprising a circuit f

1987-12-18

1989-06-20

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

370106, H04N 704

Patent

active

048413658

ABSTRACT:
Arrangement for receiving numerical data transmitted in the form of multiplexed packets in the video channel of a television transmission system, particularly comprising a circuit for recognizing data whose output signal (V) is used to authorize the transfer of the data signal (D) from a demodulator to a demultiplexer by means of an switching circuit (16a). The circuit (160) for recognizing the data comprises a D flip-flop (31) receiving the data signal (D), an exclusive-OR gate (33) whose inputs receive the data signal (D) and the output signal (D') of the D flip-flop (31) and which supplies from its output a signal (DX) applied to the input of a synchronous control module (32) which stores a given sequence of successive states of its input (36) during the opening period of a time window generated by a window generator (34) and which supplies the recognition signal (V) for authorizing the transfer when the said sequence of successive states is essentially a sequence of high states. Application: reception of data transmitted by means of a system such as Antiope, Ceefax or Nabts.

REFERENCES:
patent: 4479146 (1984-10-01), Cohn
patent: 4520394 (1985-05-01), Kaneko
patent: 4600943 (1986-07-01), Tanabe
patent: 4688218 (1987-08-01), Bliueau et al.
C. Schwartz et al., "specification preliminaire diesysteme de Teletexte An tiope.RTM. Radio Diffusion/Television", No. 27, Apr./May 1977.
BBC et al., "Broadcast Teletext: Specification" (Sep. 1976) pp. 1-20.

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