GB1482971A - Digital data transmission systems - Google Patents

Digital data transmission systems

Info

Publication number
GB1482971A
GB1482971A GB32606/74A GB3260674A GB1482971A GB 1482971 A GB1482971 A GB 1482971A GB 32606/74 A GB32606/74 A GB 32606/74A GB 3260674 A GB3260674 A GB 3260674A GB 1482971 A GB1482971 A GB 1482971A
Authority
GB
United Kingdom
Prior art keywords
frequency
carrier
signal
zero
data transmission
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
GB32606/74A
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.)
Siemens AG
Original Assignee
Siemens AG
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 DE19732339806 external-priority patent/DE2339806C3/en
Application filed by Siemens AG filed Critical Siemens AG
Publication of GB1482971A publication Critical patent/GB1482971A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/04—Frequency-transposition arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J4/00—Combined time-division and frequency-division multiplex systems
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Electromagnetism (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Dc Digital Transmission (AREA)

Abstract

1482971 Data transmission SIEMENS AG 24 July 1974 [6 Aug 1973] 32606/74 Addition to 1473941 Heading H4P In the digital transmission system of parent Specification in which digital signals are transmitted after frequency shifting by a frequency equal to half the bit repetition frequency the frequency shift is achieved by modulation by a carrier of half the bit repetition frequency whose zero transitions are displaced 90 degrees from the zero transitions of the digital signal, in a modulator whose output is zero for zero level carrier and/or signal, positive when carrier and signal are both positive or both negative, and negative when the carrier and signal are of opposite polarity. Preferably the modulation is carried out using an assembly of four NAND gates 27, 28, 29, 30, and two AND gates 31, 32 with the AND gate outputs fed to respective ends of the primary of a transformer 13 from whose secondary the frequency shifted output is derived.
GB32606/74A 1973-08-06 1974-07-24 Digital data transmission systems Expired GB1482971A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732339806 DE2339806C3 (en) 1973-08-06 Messaging system

Publications (1)

Publication Number Publication Date
GB1482971A true GB1482971A (en) 1977-08-17

Family

ID=5889038

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32606/74A Expired GB1482971A (en) 1973-08-06 1974-07-24 Digital data transmission systems

Country Status (6)

Country Link
JP (2) JPS5076966A (en)
AT (1) AT350111B (en)
BE (1) BE818558R (en)
GB (1) GB1482971A (en)
IT (1) IT1046369B (en)
SE (1) SE404745B (en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1368068A (en) * 1971-10-20 1974-09-25 Post Office Digital communication systems

Also Published As

Publication number Publication date
AT350111B (en) 1979-05-10
DE2339806A1 (en) 1975-02-27
ATA626974A (en) 1978-10-15
JPS5076966A (en) 1975-06-24
IT1046369B (en) 1980-06-30
JPS5717583Y2 (en) 1982-04-13
AU7208274A (en) 1976-02-12
SE7410037L (en) 1975-02-07
BE818558R (en) 1974-12-02
SE404745B (en) 1978-10-23
JPS5660342U (en) 1981-05-22
DE2339806B2 (en) 1976-09-23

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee