GB2014401A - Data communication system - Google Patents

Data communication system

Info

Publication number
GB2014401A
GB2014401A GB7901720A GB7901720A GB2014401A GB 2014401 A GB2014401 A GB 2014401A GB 7901720 A GB7901720 A GB 7901720A GB 7901720 A GB7901720 A GB 7901720A GB 2014401 A GB2014401 A GB 2014401A
Authority
GB
United Kingdom
Prior art keywords
unit
transmitted
alternately
code
circuit includes
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.)
Granted
Application number
GB7901720A
Other versions
GB2014401B (en
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.)
Hitachi Ltd
Original Assignee
Hitachi 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
Priority claimed from JP53004357A external-priority patent/JPS5831136B2/en
Priority claimed from JP14237678A external-priority patent/JPS5568761A/en
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Publication of GB2014401A publication Critical patent/GB2014401A/en
Application granted granted Critical
Publication of GB2014401B publication Critical patent/GB2014401B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/4917—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes
    • H04L25/4923—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes using ternary codes
    • H04L25/4925—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes using ternary codes using balanced bipolar ternary codes

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Dc Digital Transmission (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Communication Control (AREA)

Abstract

Two logical values 1, 0 of a 3- valued code Fig. 5 correspond to "1" and "0" in binary code. When the same binary logical value occurs in successive digits of a data to be transmitted, the corresponding logical value and a third logical value PHI are transmitted alternately. When the different binary logical values 1, 0 occur in the data alternately, the corresponding logical values are transmitted alternately. At the transmitting end the circuit includes a processing unit (10) a coding unit (14), a check code unit (16), a combining unit (18) and a transmitter unit (20). At the receiving end the circuit includes a receiver unit (22), a decoding unit (24) an error detecting unit (26) and a processing unit (12). The value PHI may lie either within, or outside, the range 1-0. <IMAGE>
GB7901720A 1978-01-20 1979-01-17 Data communication system Expired GB2014401B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP53004357A JPS5831136B2 (en) 1978-01-20 1978-01-20 Digital signal transmission method
JP14237678A JPS5568761A (en) 1978-11-20 1978-11-20 Digital signal transmission system

Publications (2)

Publication Number Publication Date
GB2014401A true GB2014401A (en) 1979-08-22
GB2014401B GB2014401B (en) 1982-03-31

Family

ID=26338106

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7901720A Expired GB2014401B (en) 1978-01-20 1979-01-17 Data communication system

Country Status (4)

Country Link
DE (1) DE2902133C3 (en)
FR (1) FR2423016A1 (en)
GB (1) GB2014401B (en)
SE (1) SE7813424L (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0078577A1 (en) * 1981-11-02 1983-05-11 Philips Electronics Uk Limited Code generator
GB2183971A (en) * 1985-12-05 1987-06-10 Stc Plc Data transmission system
US7221711B2 (en) 2002-03-27 2007-05-22 Woodworth John R Multilevel data encoding and modulation technique

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2759047A (en) * 1950-12-27 1956-08-14 Bell Telephone Labor Inc Pulse transmission system and regenerative repeater therefor
GB830848A (en) * 1956-11-05 1960-03-23 Standard Telephones Cables Ltd Improvements relating to transmission or storage systems employing information in binary code form
US3502810A (en) * 1966-08-15 1970-03-24 Bell Telephone Labor Inc Bipolar pulse transmission system with self-derived timing and drift compensation
FR1579145A (en) * 1967-07-27 1969-08-22
US3863025A (en) * 1973-04-25 1975-01-28 Gte Automatic Electric Lab Inc Data transmission method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0078577A1 (en) * 1981-11-02 1983-05-11 Philips Electronics Uk Limited Code generator
GB2183971A (en) * 1985-12-05 1987-06-10 Stc Plc Data transmission system
GB2183971B (en) * 1985-12-05 1989-10-04 Stc Plc Data transmission system
US7221711B2 (en) 2002-03-27 2007-05-22 Woodworth John R Multilevel data encoding and modulation technique

Also Published As

Publication number Publication date
FR2423016A1 (en) 1979-11-09
DE2902133A1 (en) 1979-07-26
GB2014401B (en) 1982-03-31
DE2902133B2 (en) 1980-10-02
SE7813424L (en) 1979-07-21
DE2902133C3 (en) 1981-07-30
FR2423016B1 (en) 1983-04-29

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Effective date: 19990116