JPS56110315A - Automatic gain controller for narrow-band wave detection - Google Patents

Automatic gain controller for narrow-band wave detection

Info

Publication number
JPS56110315A
JPS56110315A JP1260780A JP1260780A JPS56110315A JP S56110315 A JPS56110315 A JP S56110315A JP 1260780 A JP1260780 A JP 1260780A JP 1260780 A JP1260780 A JP 1260780A JP S56110315 A JPS56110315 A JP S56110315A
Authority
JP
Japan
Prior art keywords
signal
narrow
band
output
frequency
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
JP1260780A
Other languages
Japanese (ja)
Inventor
Yujiro Ishikawa
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 JP1260780A priority Critical patent/JPS56110315A/en
Publication of JPS56110315A publication Critical patent/JPS56110315A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control

Abstract

PURPOSE:To keep a constant input frequency of a narrow-band BPF and thus realize a measurement of the high-band sweep, by varying the oscillation frequency of a voltage control oscillator with variation of the input frequency. CONSTITUTION:The signal 2 that is filtered by the BPF101 of the input signal 1 is amplified by the amplfier 102 to secure a constant level and then supplied to the switch circuit 103. On the other hand, the branch output 7 of the signal path 3 is mixed with the output of the voltage control oscillator 112 by the mixer 108 to be applied to the narrow-band BPF107. The squelch circuit 109 decides the level of the signal 1 and then switches the circuit 103 so that the output of the oscillaor 105 is turned into the output signal 5 in case when the level of the signal 1 is lower than the prescribed value. The oscillation frequency of the oscillator 12 is controlled so that the input frequency of the BPF107 becomes identical to the central frequency of the BPF107. As a result, a measurement is possible for the wind-band sweep.
JP1260780A 1980-02-05 1980-02-05 Automatic gain controller for narrow-band wave detection Pending JPS56110315A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1260780A JPS56110315A (en) 1980-02-05 1980-02-05 Automatic gain controller for narrow-band wave detection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1260780A JPS56110315A (en) 1980-02-05 1980-02-05 Automatic gain controller for narrow-band wave detection

Publications (1)

Publication Number Publication Date
JPS56110315A true JPS56110315A (en) 1981-09-01

Family

ID=11810035

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1260780A Pending JPS56110315A (en) 1980-02-05 1980-02-05 Automatic gain controller for narrow-band wave detection

Country Status (1)

Country Link
JP (1) JPS56110315A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60145713A (en) * 1984-01-10 1985-08-01 Fujitsu Ltd Automatic gain control system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60145713A (en) * 1984-01-10 1985-08-01 Fujitsu Ltd Automatic gain control system
JPH0325048B2 (en) * 1984-01-10 1991-04-04 Fujitsu Ltd

Similar Documents

Publication Publication Date Title
JPS56110315A (en) Automatic gain controller for narrow-band wave detection
JPS54140442A (en) Automatic sensitivity control circuit for receiver
JPS5586209A (en) Automatic high-frequency level regulator circuit
JPS56111111A (en) Automatic recording level setter
JPS56104540A (en) Oscillation/wave detection device
JPS5748674A (en) Radio receiver
JPS54118149A (en) Comparator circuit
JPS5731236A (en) Frequency converting and amplifying circuit
JPS6410736A (en) Transmitter-receiver
JPS57160229A (en) Intermediate frequency amplifier with narrow band squelch detecting circuit
JPS5577241A (en) Community receiving amplifier
JPS57133371A (en) Sweeping method
JPS55140179A (en) Pulse duration lengthening device
JPS55159618A (en) Receiving method of electronic tuning type and its unit
JPS55143448A (en) Selective level measuring instrument
JPS57186822A (en) Automatic channel searching device
JPS5475919A (en) Receiver
JPS56129409A (en) Oscillator
JPS5474314A (en) Muting unit
JPS56104539A (en) Oscillation/wave detection device
JPS5723334A (en) Tuning circuit equipped with vco
JPS5720035A (en) Synthesizer receiver
JPS56103376A (en) Automatic tester of analog circuit unit
JPS568928A (en) Automatic frequency control circuit of voltage control oscillator
JPS56157148A (en) Stereo and monaural change-over device