FR2240580A2 - Symmetrical digital modulator cct. - eliminates modulation products for interference free use in analogue communication systems - Google Patents

Symmetrical digital modulator cct. - eliminates modulation products for interference free use in analogue communication systems

Info

Publication number
FR2240580A2
FR2240580A2 FR7426941A FR7426941A FR2240580A2 FR 2240580 A2 FR2240580 A2 FR 2240580A2 FR 7426941 A FR7426941 A FR 7426941A FR 7426941 A FR7426941 A FR 7426941A FR 2240580 A2 FR2240580 A2 FR 2240580A2
Authority
FR
France
Prior art keywords
cct
communication systems
digital modulator
interference free
free use
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
FR7426941A
Other languages
French (fr)
Other versions
FR2240580B2 (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.)
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 DE19732318800 external-priority patent/DE2318800C3/en
Application filed by Siemens AG filed Critical Siemens AG
Publication of FR2240580A2 publication Critical patent/FR2240580A2/en
Application granted granted Critical
Publication of FR2240580B2 publication Critical patent/FR2240580B2/fr
Granted 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
    • 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
    • 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)
  • Electromagnetism (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

In a communication system where analogue signals are transmitted between two stations using a carrier frequency transmission on symmetrical or coaxial cables, two wires are used for the transmission of digital signals. In these systems a half frequency component of the digital signal is derived. This interfering signal is eliminated by using a double symmetrical digital modulator cct. comprising several logic cct. elements. The digital signal and carrier frequency signal are digitally modulated for transmission along the cables with consequent elimination of the half frequency signal.
FR7426941A 1973-04-13 1974-08-02 Symmetrical digital modulator cct. - eliminates modulation products for interference free use in analogue communication systems Granted FR2240580A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19732318800 DE2318800C3 (en) 1973-04-13 Messaging system
DE19732339806 DE2339806C3 (en) 1973-08-06 Messaging system

Publications (2)

Publication Number Publication Date
FR2240580A2 true FR2240580A2 (en) 1975-03-07
FR2240580B2 FR2240580B2 (en) 1980-01-04

Family

ID=25764975

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7426941A Granted FR2240580A2 (en) 1973-04-13 1974-08-02 Symmetrical digital modulator cct. - eliminates modulation products for interference free use in analogue communication systems

Country Status (2)

Country Link
FR (1) FR2240580A2 (en)
NL (1) NL7410449A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0035434A1 (en) * 1980-03-05 1981-09-09 Thomson-Csf Transmitting and receiving device for the transmission of digital signals

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0035434A1 (en) * 1980-03-05 1981-09-09 Thomson-Csf Transmitting and receiving device for the transmission of digital signals
FR2477811A1 (en) * 1980-03-05 1981-09-11 Thomson Csf TRANSCEIVER DEVICE AND RECEIVER DEVICE FOR TRANSMITTING DIGITAL SIGNALS

Also Published As

Publication number Publication date
NL7410449A (en) 1975-02-10
FR2240580B2 (en) 1980-01-04

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