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JPS57170617A - Receiver - Google Patents

Receiver

Info

Publication number
JPS57170617A
JPS57170617A JP5530881A JP5530881A JPS57170617A JP S57170617 A JPS57170617 A JP S57170617A JP 5530881 A JP5530881 A JP 5530881A JP 5530881 A JP5530881 A JP 5530881A JP S57170617 A JPS57170617 A JP S57170617A
Authority
JP
Japan
Prior art keywords
circuit
automatic sweeping
signal intensity
automatic
sweep speed
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
JP5530881A
Other languages
Japanese (ja)
Inventor
Hidekazu Ishii
Ryuichi Kioka
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 JP5530881A priority Critical patent/JPS57170617A/en
Publication of JPS57170617A publication Critical patent/JPS57170617A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03JTUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/18Automatic scanning over a band of frequencies

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To increase an automatic sweep speed, to eliminate the malfunction of automatic sweeping, and to reduce the cost of constitution by increasing the sweep speed of a reception frequency by an automatic sweeping mechanism when a received signal level is low, and decreasing it when high. CONSTITUTION:A signal intensity detecting circuit 11 detects the signal intensity of a limiter amplifying circuit 6 and then sends it to a discriminating circuit 10. When it is judged that an input has not enough signal intensity, the output of a low-frequency amplifying circuit 8 is muted to prevent it from appearing at an output terminal 9. On the other hand, the outputs of the detecting circuit 11 and discriminating circuit 10 are inputted to an automatic sweeping circuit 14. When the signal level does not reach a certain level yet, the sweep speed of the tuning frequency of an FM receiver by an automatic sweeping circuit 14 is increased and when so, the speed is decreased.
JP5530881A 1981-04-13 1981-04-13 Receiver Pending JPS57170617A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5530881A JPS57170617A (en) 1981-04-13 1981-04-13 Receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5530881A JPS57170617A (en) 1981-04-13 1981-04-13 Receiver

Publications (1)

Publication Number Publication Date
JPS57170617A true JPS57170617A (en) 1982-10-20

Family

ID=12994934

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5530881A Pending JPS57170617A (en) 1981-04-13 1981-04-13 Receiver

Country Status (1)

Country Link
JP (1) JPS57170617A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH028224U (en) * 1988-06-28 1990-01-19
JP2007274674A (en) * 2006-03-07 2007-10-18 Hitachi Cable Ltd Tunable receiver with automatic frequency correction function
JP2008236555A (en) * 2007-03-22 2008-10-02 Rhythm Watch Co Ltd Eavesdropping detector
JP2010011412A (en) * 2008-06-30 2010-01-14 Rhythm Watch Co Ltd Eavesdropping device detector and clock

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5245814A (en) * 1975-10-09 1977-04-11 Toshiba Corp Auto-tuning system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5245814A (en) * 1975-10-09 1977-04-11 Toshiba Corp Auto-tuning system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH028224U (en) * 1988-06-28 1990-01-19
JP2007274674A (en) * 2006-03-07 2007-10-18 Hitachi Cable Ltd Tunable receiver with automatic frequency correction function
JP2008236555A (en) * 2007-03-22 2008-10-02 Rhythm Watch Co Ltd Eavesdropping detector
JP2010011412A (en) * 2008-06-30 2010-01-14 Rhythm Watch Co Ltd Eavesdropping device detector and clock

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