JPS556964A - Carrier wave reproducing device - Google Patents

Carrier wave reproducing device

Info

Publication number
JPS556964A
JPS556964A JP7946578A JP7946578A JPS556964A JP S556964 A JPS556964 A JP S556964A JP 7946578 A JP7946578 A JP 7946578A JP 7946578 A JP7946578 A JP 7946578A JP S556964 A JPS556964 A JP S556964A
Authority
JP
Japan
Prior art keywords
sampling
vco15
wave
period
clock
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
JP7946578A
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 JP7946578A priority Critical patent/JPS556964A/en
Publication of JPS556964A publication Critical patent/JPS556964A/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 poing 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), the carrier wave is reproduced through voltage control type oscillator VCO15. And demodulation data (b) is obtained from modulator MOD16. The demodulation data is supplied to clock reproduction circuit 18 to reproduce clock (c) and then supplies the clock to sampling control circuit 14 to produce the sampling control signal like (d). The sampling action of sampling hold circuit SH13 is blocked while the control signal is kept at the L level, i.e., the C/N of the PSK wave is small. Then the output of LPF12 obtained in the period of a large C/N is held and then applied to VCO15. As a result, the noise gives no effect to the control voltage of VCO15 even for noise (e) of the PSK wave in the period of a samll C/N.
JP7946578A 1978-06-30 1978-06-30 Carrier wave reproducing device Pending JPS556964A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7946578A JPS556964A (en) 1978-06-30 1978-06-30 Carrier wave reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7946578A JPS556964A (en) 1978-06-30 1978-06-30 Carrier wave reproducing device

Publications (1)

Publication Number Publication Date
JPS556964A true JPS556964A (en) 1980-01-18

Family

ID=13690627

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7946578A Pending JPS556964A (en) 1978-06-30 1978-06-30 Carrier wave reproducing device

Country Status (1)

Country Link
JP (1) JPS556964A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58500344A (en) * 1981-02-27 1983-03-03 スペリ−　コ−ポレイシヨン Two-phase detection device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58500344A (en) * 1981-02-27 1983-03-03 スペリ−　コ−ポレイシヨン Two-phase detection device

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