JPS5741018A - Dynamic tracking filter of injection synchronizing oscillator type - Google Patents

Dynamic tracking filter of injection synchronizing oscillator type

Info

Publication number
JPS5741018A
JPS5741018A JP11751280A JP11751280A JPS5741018A JP S5741018 A JPS5741018 A JP S5741018A JP 11751280 A JP11751280 A JP 11751280A JP 11751280 A JP11751280 A JP 11751280A JP S5741018 A JPS5741018 A JP S5741018A
Authority
JP
Japan
Prior art keywords
signal
ilo4
supplied
detected
synchronizing
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
JP11751280A
Other languages
Japanese (ja)
Inventor
Yoshio Nomachi
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP11751280A priority Critical patent/JPS5741018A/en
Publication of JPS5741018A publication Critical patent/JPS5741018A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/18—Automatic scanning over a band of frequencies
    • H03J7/20—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element
    • H03J7/24—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element using varactors, i.e. voltage variable reactive diodes

Landscapes

  • Radio Relay Systems (AREA)
  • Filters And Equalizers (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To improve a carrier-to-noise power ratio (C/N), by detecting a phase error between an output of an injection synchronizing oscillator (ILO) and an FM signal, and providing it to a tuning circuit. CONSTITUTION:An FM signal 1 is divided into FM signals 7, 8 by a distributing circuit 6, and one FM signal 8 is supplied to a synchronizing detector (PSD)11. The other FM signal 7 is supplied to an ILO4, and the ILO4 outputs an FM signal 5, synchronizing with the FM signal 7. The FM output signal 5 is supplied to the PSD11 through a limiter 9, is detected synchronously with the FM signal 8 from the distributing circuit 6, and as for the FM signal 7, a phase error ocurring at the time of passing through a tuning circuit 2 of the ILO4 is detected. This detected signal 12 is amplified by a loop filter 13, also its unnecessry noise component is removed, and said signal is negative-fed back to the tuning circuit 2 of the ILO4, and as a result, the ILO4 follows the input FM signal 7 and synchronizes with it, holding its narrow band characteristic.
JP11751280A 1980-08-25 1980-08-25 Dynamic tracking filter of injection synchronizing oscillator type Pending JPS5741018A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11751280A JPS5741018A (en) 1980-08-25 1980-08-25 Dynamic tracking filter of injection synchronizing oscillator type

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11751280A JPS5741018A (en) 1980-08-25 1980-08-25 Dynamic tracking filter of injection synchronizing oscillator type

Publications (1)

Publication Number Publication Date
JPS5741018A true JPS5741018A (en) 1982-03-06

Family

ID=14713590

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11751280A Pending JPS5741018A (en) 1980-08-25 1980-08-25 Dynamic tracking filter of injection synchronizing oscillator type

Country Status (1)

Country Link
JP (1) JPS5741018A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003058815A1 (en) * 2001-12-26 2003-07-17 Motorola, Inc., A Corporation Of The State Of Delaware Circuit and method for processing afc signals
US6965653B2 (en) 2000-12-21 2005-11-15 Freescale Semiconductor, Inc. Circuit and method for processing an automatic frequency control signal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6965653B2 (en) 2000-12-21 2005-11-15 Freescale Semiconductor, Inc. Circuit and method for processing an automatic frequency control signal
WO2003058815A1 (en) * 2001-12-26 2003-07-17 Motorola, Inc., A Corporation Of The State Of Delaware Circuit and method for processing afc signals

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