JPS54104270A - Carrier regenerative circuit - Google Patents

Carrier regenerative circuit

Info

Publication number
JPS54104270A
JPS54104270A JP1067078A JP1067078A JPS54104270A JP S54104270 A JPS54104270 A JP S54104270A JP 1067078 A JP1067078 A JP 1067078A JP 1067078 A JP1067078 A JP 1067078A JP S54104270 A JPS54104270 A JP S54104270A
Authority
JP
Japan
Prior art keywords
carrier
demodulated
output
phase
discriminator
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
JP1067078A
Other languages
Japanese (ja)
Other versions
JPS6221302B2 (en
Inventor
Tadayoshi Kato
Eiji Itaya
Makoto Washio
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.)
Fujitsu Ltd
Nippon Telegraph and Telephone Corp
Original Assignee
Fujitsu Ltd
Nippon Telegraph and Telephone Corp
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 Fujitsu Ltd, Nippon Telegraph and Telephone Corp filed Critical Fujitsu Ltd
Priority to JP1067078A priority Critical patent/JPS54104270A/en
Publication of JPS54104270A publication Critical patent/JPS54104270A/en
Publication of JPS6221302B2 publication Critical patent/JPS6221302B2/ja
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
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/38—Demodulator circuits; Receiver circuits
    • H04L27/3818—Demodulator circuits; Receiver circuits using coherent demodulation, i.e. using one or more nominally phase synchronous carriers

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To modulate correctly a carrier multi-level superposition modulated signal by regenerating a carrier in correct phase, by making a discriminator discriminate the difference in the DC value of a demodulated base-band signal. CONSTITUTION:By the output of voltage control oscillator VCO and that of 90 deg.- phase shifter PSH, a carrier multi-level superposition signal is detected synchronously in synchronous detectors PD2 and PD1 and changed into demodulated output signals OUT1' and OUT1 through code regenerators REG2 and REG1. The output of PD2 is full-wave-rectified ARG and applied to discriminator ID via low-pass filter LP, thereby discriminating the lead-in phase of the carrier. When either ID discriminates that the carrier is led to an unneeded stable point, switch circuit SW is driven to turn OFF a control voltage applied to VCO for a short time, thereby performing lead-in operation. In this way, the carrier multi-level modulated signal can be demodulated correctly.
JP1067078A 1978-02-02 1978-02-02 Carrier regenerative circuit Granted JPS54104270A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1067078A JPS54104270A (en) 1978-02-02 1978-02-02 Carrier regenerative circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1067078A JPS54104270A (en) 1978-02-02 1978-02-02 Carrier regenerative circuit

Publications (2)

Publication Number Publication Date
JPS54104270A true JPS54104270A (en) 1979-08-16
JPS6221302B2 JPS6221302B2 (en) 1987-05-12

Family

ID=11756673

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1067078A Granted JPS54104270A (en) 1978-02-02 1978-02-02 Carrier regenerative circuit

Country Status (1)

Country Link
JP (1) JPS54104270A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100311072B1 (en) * 1993-08-31 2001-12-15 윤종용 Apparatus for generating base band signal of multi-level superposed amplitude-modulated signal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100311072B1 (en) * 1993-08-31 2001-12-15 윤종용 Apparatus for generating base band signal of multi-level superposed amplitude-modulated signal

Also Published As

Publication number Publication date
JPS6221302B2 (en) 1987-05-12

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