GB1173140A - Improvements in Data Transmission Systems - Google Patents

Improvements in Data Transmission Systems

Info

Publication number
GB1173140A
GB1173140A GB4920666A GB4920666A GB1173140A GB 1173140 A GB1173140 A GB 1173140A GB 4920666 A GB4920666 A GB 4920666A GB 4920666 A GB4920666 A GB 4920666A GB 1173140 A GB1173140 A GB 1173140A
Authority
GB
United Kingdom
Prior art keywords
relay
responds
combination
gated
gate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB4920666A
Inventor
Howard Mumford
Marcus Paul Barton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Telecommunications PLC
British Telecommunications Research Ltd
Original Assignee
British Telecommunications PLC
British Telecommunications Research Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by British Telecommunications PLC, British Telecommunications Research Ltd filed Critical British Telecommunications PLC
Priority to GB4920666A priority Critical patent/GB1173140A/en
Priority to FR126780A priority patent/FR1542211A/en
Publication of GB1173140A publication Critical patent/GB1173140A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/04—Speed or phase control by synchronisation signals
    • H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal
    • H04L7/042—Detectors therefor, e.g. correlators, state machines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/04—Speed or phase control by synchronisation signals
    • H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal

Abstract

1,173,140. Detecting specific digital signals. BRITISH TELECOMMUNICATIONS RESEARCH Ltd. 31 Oct., 1967 [2 Nov., 1966], No. 49206/66. Heading G4H. A circuit for detecting the occurrence of a predetermined signal pattern in a sequence of binary digits comprises a store to temporarily store each digit of the sequence, a plurality of comparison means each arranged to compare each digit of the sequence with a previous digit stored in the store, and a plurality of switching devices operable by the comparison means to produce a predetermined output when the signal pattern has occurred. In the form of Fig. 1, the incoming signals are applied to a three-stage shift register SR the outputs of which are gated with incoming signals at G1, G2, G3. Gate G1 responds to a "1, 1" combination to pick relay A, gate G2 responds to a "1, -, 1" combination to pick relay B and gate G3 responds to a " 1, -, -, 1 " combination to pick relay C. Contacts of the relays are interconnected to give outputs when specified patterns of digits are present. In another form, Fig. 3, the incoming signals are applied to a bi-stable device T and an inverter I. The output of the inverter is gated at G4 and G5 with the " 0 " and " 1 " outputs of the bi-stable. The signal itself is gated at G6 with the " 1 " output of the bi-stable. Relay A responds to a " 0, 0 " combination, relay B to " 0, 1 " and relay C to " 1, 1." Contacts of the relays are interconnected as before to indicate the presence of larger specified groups of digits.
GB4920666A 1966-11-02 1966-11-02 Improvements in Data Transmission Systems Expired GB1173140A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB4920666A GB1173140A (en) 1966-11-02 1966-11-02 Improvements in Data Transmission Systems
FR126780A FR1542211A (en) 1966-11-02 1967-11-02 Improvements to data transmission systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4920666A GB1173140A (en) 1966-11-02 1966-11-02 Improvements in Data Transmission Systems

Publications (1)

Publication Number Publication Date
GB1173140A true GB1173140A (en) 1969-12-03

Family

ID=10451545

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4920666A Expired GB1173140A (en) 1966-11-02 1966-11-02 Improvements in Data Transmission Systems

Country Status (1)

Country Link
GB (1) GB1173140A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2174223A (en) * 1985-03-15 1986-10-29 T Sa Message receiving devices for missiles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2174223A (en) * 1985-03-15 1986-10-29 T Sa Message receiving devices for missiles

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees