GB1357837A - Coding device for binary transmission - Google Patents

Coding device for binary transmission

Info

Publication number
GB1357837A
GB1357837A GB4734272A GB4734272A GB1357837A GB 1357837 A GB1357837 A GB 1357837A GB 4734272 A GB4734272 A GB 4734272A GB 4734272 A GB4734272 A GB 4734272A GB 1357837 A GB1357837 A GB 1357837A
Authority
GB
United Kingdom
Prior art keywords
signal
transmission
gates
oct
binary
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
GB4734272A
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.)
Alcatel CIT SA
Original Assignee
Alcatel CIT SA
Compagnie Industrielle de Telecommunication CIT Alcatel SA
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 Alcatel CIT SA, Compagnie Industrielle de Telecommunication CIT Alcatel SA filed Critical Alcatel CIT SA
Publication of GB1357837A publication Critical patent/GB1357837A/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
    • H04L25/03834—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties using pulse shaping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/41—Bandwidth or redundancy reduction
    • H04N1/411—Bandwidth or redundancy reduction for the transmission or storage or reproduction of two-tone pictures, e.g. black and white pictures
    • H04N1/413—Systems or arrangements allowing the picture to be reproduced without loss or modification of picture-information
    • H04N1/4135—Systems or arrangements allowing the picture to be reproduced without loss or modification of picture-information in which a baseband signal showing more than two values or a continuously varying baseband signal is transmitted or recorded

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Power Engineering (AREA)
  • Dc Digital Transmission (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

1357837 Data transmission; coding COMPAGNIE INDUSTRIELLE DES TELECOMMUNICATIONS CIT-ALCATEL 13 Oct 1972 [13 Oct 1971] 47342/72 Heading H4P The circuit of Fig. 4, converts a binary signal A (waveforms, Fig. 5, not shown) to a five-level signal Y whose levels are alternately 0, 1, 0, 1, &c. This enables a lower bandwidth channel to be used for the same binary bit rate. In Fig. 5, the two parallel channels, which are identical except for an inverter 11, include divide-by-two circuits 12, 13, 17, 18, and AND gates 14, 15 and 19, 20 responsive to complementary outputs of dividers 13, 18. Inverters 16, 21 and the gates 14, 19 feed an adding circuit 22. The output amplifier 23 may in addition (Fig. 8, not shown) have e.m.f. sources 29, 30 gated at 31, 32 to its input by monostables 27, 28 controlled by threshold circuits 25, 26, in order to boost the peak levels of the signal Y (Figs. 9, 10, not shown) prior to transmission, and thereby reduce signal degradation during transmission. A demodulator (Fig. 6, not shown) reproduces the binary signals by two successive full-wave rectification steps, and uses transformers and diodes.
GB4734272A 1971-10-13 1972-10-13 Coding device for binary transmission Expired GB1357837A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7136797A FR2161744B1 (en) 1971-10-13 1971-10-13

Publications (1)

Publication Number Publication Date
GB1357837A true GB1357837A (en) 1974-06-26

Family

ID=9084310

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4734272A Expired GB1357837A (en) 1971-10-13 1972-10-13 Coding device for binary transmission

Country Status (9)

Country Link
BE (1) BE789644A (en)
CA (1) CA971666A (en)
DE (1) DE2249819C2 (en)
FR (1) FR2161744B1 (en)
GB (1) GB1357837A (en)
IT (1) IT975237B (en)
LU (1) LU66254A1 (en)
NL (1) NL156288B (en)
SE (1) SE387498B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2250898A (en) * 1990-12-12 1992-06-17 Stc Plc Line coding scheme.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3337863A (en) * 1964-01-17 1967-08-22 Automatic Elect Lab Polybinary techniques
US3459892A (en) * 1965-09-14 1969-08-05 Bendix Corp Digital data transmission system wherein a binary level is represented by a change in the amplitude of the transmitted signal
GB1250492A (en) * 1967-07-27 1971-10-20

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2250898A (en) * 1990-12-12 1992-06-17 Stc Plc Line coding scheme.

Also Published As

Publication number Publication date
FR2161744A1 (en) 1973-07-13
CA971666A (en) 1975-07-22
BE789644A (en) 1973-04-04
NL7213636A (en) 1973-04-17
IT975237B (en) 1974-07-20
SE387498B (en) 1976-09-06
NL156288B (en) 1978-03-15
FR2161744B1 (en) 1977-08-05
DE2249819A1 (en) 1973-04-19
DE2249819C2 (en) 1982-09-16
LU66254A1 (en) 1973-04-13

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee