JPS556965A - Carrier wave reproducing device - Google Patents

Carrier wave reproducing device

Info

Publication number
JPS556965A
JPS556965A JP7946678A JP7946678A JPS556965A JP S556965 A JPS556965 A JP S556965A JP 7946678 A JP7946678 A JP 7946678A JP 7946678 A JP7946678 A JP 7946678A JP S556965 A JPS556965 A JP S556965A
Authority
JP
Japan
Prior art keywords
circuit
wave
control
pfc11
period
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
JP7946678A
Other languages
Japanese (ja)
Inventor
Fumio Sugiyama
Tsukasa Okai
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP7946678A priority Critical patent/JPS556965A/en
Publication of JPS556965A publication Critical patent/JPS556965A/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
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
    • H04L27/2275—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses the received modulated signals

Landscapes

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

Abstract

PURPOSE:To always ensure the steady reproduction of the carrier wave by preventing the shift of the stability point of the loop in the period of a small carrier-noise ratio C/N, and thus to reduce the bit error rate of the demodulation data in the coherent detection. CONSTITUTION:With application of digital phase modulation signal PSK wave (a), AM detection circuit 19 detects the envelope curve of the PSK wave. And gate control circuit 12 delivers control signal (b). This control signal features the L level while the envelope curve keeps the low level, i.e., the C/N corresponding to the narrow part of the PSK wave. Gate circuit 13a and 13b are closed regardless of the state of digital phase frequency comparator circuit PFC11, and charge pump circuit 14 receives the OFF control. Thus, the fluctuation like (c) of PFC11 occurring for that period can be prevented via circuit 13a and 13b, and the output of LPF15 under the steady state is given to voltage control type oscillator VCO16 like (d) after stabilization.
JP7946678A 1978-06-30 1978-06-30 Carrier wave reproducing device Pending JPS556965A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7946678A JPS556965A (en) 1978-06-30 1978-06-30 Carrier wave reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7946678A JPS556965A (en) 1978-06-30 1978-06-30 Carrier wave reproducing device

Publications (1)

Publication Number Publication Date
JPS556965A true JPS556965A (en) 1980-01-18

Family

ID=13690653

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7946678A Pending JPS556965A (en) 1978-06-30 1978-06-30 Carrier wave reproducing device

Country Status (1)

Country Link
JP (1) JPS556965A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0589390A1 (en) * 1992-09-25 1994-03-30 Siemens Aktiengesellschaft Receiver for phase shift modulated carrier signals
WO1999029075A1 (en) * 1997-11-28 1999-06-10 Kabushiki Kaisha Kenwood Hierarchical transmission digital demodulator
WO1999039486A1 (en) * 1998-01-30 1999-08-05 Kabushiki Kaisha Kenwood Digital demodulator

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0589390A1 (en) * 1992-09-25 1994-03-30 Siemens Aktiengesellschaft Receiver for phase shift modulated carrier signals
WO1999029075A1 (en) * 1997-11-28 1999-06-10 Kabushiki Kaisha Kenwood Hierarchical transmission digital demodulator
US6678336B1 (en) 1997-11-28 2004-01-13 Kabushiki Kaisha Kenwood Hierarchical transmission digital demodulator
WO1999039486A1 (en) * 1998-01-30 1999-08-05 Kabushiki Kaisha Kenwood Digital demodulator
US6813321B1 (en) 1998-01-30 2004-11-02 Kabushiki Kaisha Kenwood Digital demodulator

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