JPS57207463A - Reproducing circuit for reference carrier wave - Google Patents

Reproducing circuit for reference carrier wave

Info

Publication number
JPS57207463A
JPS57207463A JP56092465A JP9246581A JPS57207463A JP S57207463 A JPS57207463 A JP S57207463A JP 56092465 A JP56092465 A JP 56092465A JP 9246581 A JP9246581 A JP 9246581A JP S57207463 A JPS57207463 A JP S57207463A
Authority
JP
Japan
Prior art keywords
frequency
output
multiplier
circuit
carrier wave
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.)
Pending
Application number
JP56092465A
Other languages
Japanese (ja)
Inventor
Sadao Takenaka
Hiroshi Kurihara
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
Original Assignee
Fujitsu Ltd
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 filed Critical Fujitsu Ltd
Priority to JP56092465A priority Critical patent/JPS57207463A/en
Publication of JPS57207463A publication Critical patent/JPS57207463A/en
Pending 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
    • H04L27/144—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements
    • H04L27/148—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements using filters, including PLL-type filters

Landscapes

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

Abstract

PURPOSE:To eliminate an error output of a demodulator without phase shift from a reproducing circuit, by providing a circuit which multiplies output components multiplied directly and via a filter compensating the shift in carrier wave components and frequency-divides them. CONSTITUTION:A modulation wave of a minimum shift keying (MSK) system is multiplied by two at a frequency multiplier DBL and the frequency components are applied to BPFs 1 and 2 at a hybrid circuit H1. Frequency components (2omega1t1+DELTAtheta) and (2omega2t+DELTAtheta) only are picked up at the BPFs 1 and 2, they are multiplied at a multiplier ML1 and applied to the 2nd hybrid circuit H2. The output component is the circuit H2 is directly added to a multiplier ML2, the other is applied to a BPF4 compensating the carrier frequency, and an output frequency-dividing the output of the BPF4 at a 1/2 frequency-divider DV2 is applied to the multiplier ML2. The output from the multiplier ML2 is applied to a BPF5, 2omega0t only is outputted from the BPF5 and a reference carrier wave without phase shift can be outputted from the 3rd frequency divider DV3.
JP56092465A 1981-06-16 1981-06-16 Reproducing circuit for reference carrier wave Pending JPS57207463A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56092465A JPS57207463A (en) 1981-06-16 1981-06-16 Reproducing circuit for reference carrier wave

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56092465A JPS57207463A (en) 1981-06-16 1981-06-16 Reproducing circuit for reference carrier wave

Publications (1)

Publication Number Publication Date
JPS57207463A true JPS57207463A (en) 1982-12-20

Family

ID=14055086

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56092465A Pending JPS57207463A (en) 1981-06-16 1981-06-16 Reproducing circuit for reference carrier wave

Country Status (1)

Country Link
JP (1) JPS57207463A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4601048A (en) * 1984-04-02 1986-07-15 Ryan Carl R Serial minimum shift-keyed modem
US4622683A (en) * 1984-11-08 1986-11-11 Trw Inc. Fast acquisition ringing filter MSK demodulator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4601048A (en) * 1984-04-02 1986-07-15 Ryan Carl R Serial minimum shift-keyed modem
US4622683A (en) * 1984-11-08 1986-11-11 Trw Inc. Fast acquisition ringing filter MSK demodulator

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