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JPS54130811A - Carrier wave reproducing device - Google Patents

Carrier wave reproducing device

Info

Publication number
JPS54130811A
JPS54130811A JP3811178A JP3811178A JPS54130811A JP S54130811 A JPS54130811 A JP S54130811A JP 3811178 A JP3811178 A JP 3811178A JP 3811178 A JP3811178 A JP 3811178A JP S54130811 A JPS54130811 A JP S54130811A
Authority
JP
Japan
Prior art keywords
phase
output
signal
amplitude
phase modulation
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
JP3811178A
Other languages
Japanese (ja)
Inventor
Yoichi Saito
Izumi Horikawa
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP3811178A priority Critical patent/JPS54130811A/en
Publication of JPS54130811A publication Critical patent/JPS54130811A/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
    • H04L27/32—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
    • H04L27/3836—Demodulator circuits; Receiver circuits using coherent demodulation, i.e. using one or more nominally phase synchronous carriers in which the carrier is recovered using the received modulated signal or the received IF signal, e.g. by detecting a pilot or by frequency multiplication

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 reproduce a carrier wave by subjecting amplitude phase modulation signals to multilevel discrimination in the receiving side and adding a unit which holds the control signal in the preceding signal pattern in case that a signal pattern having a large phase error in comparison with four-phase modulation signals. CONSTITUTION:The output signal of voltage control oscillator 29 is used as a reference phase to detect in-phase and orthogonal components of amplitude phase modulation signal 100 by phase detectors 20 and 21. These detection signals are discriminated by four-level discriminators 24 and 25 obtain four sequence binary signals 110, 120, 130 and 140. The amplitude phase modulation wave delayed by delay line 23 is modulated reversely by large-amplitude four-phase modulation detection signals 110 and 120 in four-phase modulator 26, and the output is inputted to phase detector 27. The output of oscillator 29 is compared with the output of reverse modulator 26 in phase by phase detector 27, and the output is gated by the output signal of logical operation circuit 30 in hold circuit 31, and simultaneously, control information is held to control oscillator 29.
JP3811178A 1978-04-03 1978-04-03 Carrier wave reproducing device Pending JPS54130811A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3811178A JPS54130811A (en) 1978-04-03 1978-04-03 Carrier wave reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3811178A JPS54130811A (en) 1978-04-03 1978-04-03 Carrier wave reproducing device

Publications (1)

Publication Number Publication Date
JPS54130811A true JPS54130811A (en) 1979-10-11

Family

ID=12516356

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3811178A Pending JPS54130811A (en) 1978-04-03 1978-04-03 Carrier wave reproducing device

Country Status (1)

Country Link
JP (1) JPS54130811A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6359147A (en) * 1986-08-29 1988-03-15 インタ−ナショナル・ビジネス・マシ−ンズ・コ−ポレ−ション Signal processing system
JPH0257644U (en) * 1979-11-16 1990-04-25

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5297661A (en) * 1976-02-13 1977-08-16 Nippon Telegr & Teleph Corp <Ntt> Carrier wave reproduction equipment

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5297661A (en) * 1976-02-13 1977-08-16 Nippon Telegr & Teleph Corp <Ntt> Carrier wave reproduction equipment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0257644U (en) * 1979-11-16 1990-04-25
JPH0520028Y2 (en) * 1979-11-16 1993-05-26
JPS6359147A (en) * 1986-08-29 1988-03-15 インタ−ナショナル・ビジネス・マシ−ンズ・コ−ポレ−ション Signal processing system

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