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FR2249509A1 - Frequency modulation and differential phase demodulation system - provides signal with zero spectrum at zero frequency - Google Patents

Frequency modulation and differential phase demodulation system - provides signal with zero spectrum at zero frequency

Info

Publication number
FR2249509A1
FR2249509A1 FR7338436A FR7338436A FR2249509A1 FR 2249509 A1 FR2249509 A1 FR 2249509A1 FR 7338436 A FR7338436 A FR 7338436A FR 7338436 A FR7338436 A FR 7338436A FR 2249509 A1 FR2249509 A1 FR 2249509A1
Authority
FR
France
Prior art keywords
zero
signal
frequency
differential phase
phase demodulation
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
FR7338436A
Other languages
French (fr)
Other versions
FR2249509B1 (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.)
Telecommunications Radioelectriques et Telephoniques SA TRT
Original Assignee
Telecommunications Radioelectriques et Telephoniques SA TRT
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 Telecommunications Radioelectriques et Telephoniques SA TRT filed Critical Telecommunications Radioelectriques et Telephoniques SA TRT
Priority to FR7338436A priority Critical patent/FR2249509A1/en
Publication of FR2249509A1 publication Critical patent/FR2249509A1/en
Application granted granted Critical
Publication of FR2249509B1 publication Critical patent/FR2249509B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/14—Demodulator circuits; Receiver circuits
    • H04L27/156—Demodulator circuits; Receiver circuits with demodulation using temporal properties of the received signal, e.g. detecting pulse width
    • H04L27/1563—Demodulator circuits; Receiver circuits with demodulation using temporal properties of the received signal, e.g. detecting pulse width using transition or level detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/12—Modulator circuits; Transmitter circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

Data communication equipment can use frequency modulation and differential phase demodulation of a carrier signal. The transmitter has a frequency modulator (3) to which is applied a modulated signal obtained from the data signal to be transmitted. This modulated signal is supplied by another modulator (9) and the fundamental component is applied to an input (10) of this modulator and a binary signal corresponding to the data signal is applied at a second input (4). The modulator (9) supplies the data clock signal with or without phase inversion according to the value of the binary signal. The differential phase demodulation is carried out by the receiver.
FR7338436A 1973-10-29 1973-10-29 Frequency modulation and differential phase demodulation system - provides signal with zero spectrum at zero frequency Granted FR2249509A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7338436A FR2249509A1 (en) 1973-10-29 1973-10-29 Frequency modulation and differential phase demodulation system - provides signal with zero spectrum at zero frequency

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7338436A FR2249509A1 (en) 1973-10-29 1973-10-29 Frequency modulation and differential phase demodulation system - provides signal with zero spectrum at zero frequency

Publications (2)

Publication Number Publication Date
FR2249509A1 true FR2249509A1 (en) 1975-05-23
FR2249509B1 FR2249509B1 (en) 1977-09-23

Family

ID=9127040

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7338436A Granted FR2249509A1 (en) 1973-10-29 1973-10-29 Frequency modulation and differential phase demodulation system - provides signal with zero spectrum at zero frequency

Country Status (1)

Country Link
FR (1) FR2249509A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE671160A (en) * 1964-05-13 1966-02-14
US3492576A (en) * 1966-07-29 1970-01-27 Bell Telephone Labor Inc Differential phase modulated communication system
FR2102838A5 (en) * 1970-08-25 1972-04-07 Geophysique Cie Gle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE671160A (en) * 1964-05-13 1966-02-14
US3492576A (en) * 1966-07-29 1970-01-27 Bell Telephone Labor Inc Differential phase modulated communication system
FR2102838A5 (en) * 1970-08-25 1972-04-07 Geophysique Cie Gle

Also Published As

Publication number Publication date
FR2249509B1 (en) 1977-09-23

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Legal Events

Date Code Title Description
ST Notification of lapse