JPS5463661A - Carrier extracting unit - Google Patents

Carrier extracting unit

Info

Publication number
JPS5463661A
JPS5463661A JP12992477A JP12992477A JPS5463661A JP S5463661 A JPS5463661 A JP S5463661A JP 12992477 A JP12992477 A JP 12992477A JP 12992477 A JP12992477 A JP 12992477A JP S5463661 A JPS5463661 A JP S5463661A
Authority
JP
Japan
Prior art keywords
output
resonance circuit
multiplier
control signals
mesial
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
JP12992477A
Other languages
Japanese (ja)
Inventor
Junji Namiki
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP12992477A priority Critical patent/JPS5463661A/en
Publication of JPS5463661A publication Critical patent/JPS5463661A/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

Abstract

PURPOSE:To make the frequency lead-in range of a resonance circuit wide and the noise band narrow by providing a means which changes control signals so that the mesial magnitude width of the resonance circuit may be narrower according as the output of the resonance circuit increases. CONSTITUTION:An input signal and the output of voltage control oscillator 5 are applied to the first multiplier 1, and the output of the first multiplier is applied to resonance circuit 600. The output of resonance circuit 600 and the output of the voltage control oscillator are applied to the second multiplier 2, and the input and the output of resonance circuit 600 are applied to phase difference detector 3. The output frequency of voltage control oscillatoer 5 is controlled by the output of detector 3, and a signal which has the same phase as the input signal is obtained from the output of the second multiplier. Resonance circuit 600 where the mesial magnitude width is changed by control signals is used as the resonance circuit 600 above, and control signals are changed so that the mesial magnitude width may be narrower according as the absolute value of the output level of phase difference detector 3 is reduced. Then, control signals are changed so that the mesial mamagnitude width of the resonance circuit may be narrower according as the output of the resonance circuit increases. As a result, the frequency lead-in range of resonance circuit 600 can be made wider, and the frequency stability can be made well.
JP12992477A 1977-10-28 1977-10-28 Carrier extracting unit Pending JPS5463661A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12992477A JPS5463661A (en) 1977-10-28 1977-10-28 Carrier extracting unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12992477A JPS5463661A (en) 1977-10-28 1977-10-28 Carrier extracting unit

Publications (1)

Publication Number Publication Date
JPS5463661A true JPS5463661A (en) 1979-05-22

Family

ID=15021766

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12992477A Pending JPS5463661A (en) 1977-10-28 1977-10-28 Carrier extracting unit

Country Status (1)

Country Link
JP (1) JPS5463661A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50115951A (en) * 1974-02-23 1975-09-10

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50115951A (en) * 1974-02-23 1975-09-10

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