JPS5778231A - Automatic gain control device - Google Patents

Automatic gain control device

Info

Publication number
JPS5778231A
JPS5778231A JP15377080A JP15377080A JPS5778231A JP S5778231 A JPS5778231 A JP S5778231A JP 15377080 A JP15377080 A JP 15377080A JP 15377080 A JP15377080 A JP 15377080A JP S5778231 A JPS5778231 A JP S5778231A
Authority
JP
Japan
Prior art keywords
control device
frequency
gain control
desired receiving
receiving 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.)
Granted
Application number
JP15377080A
Other languages
Japanese (ja)
Other versions
JPS6312406B2 (en
Inventor
Akinori Maeda
Shigeki Inoue
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP15377080A priority Critical patent/JPS5778231A/en
Publication of JPS5778231A publication Critical patent/JPS5778231A/en
Publication of JPS6312406B2 publication Critical patent/JPS6312406B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver

Landscapes

  • Control Of Amplification And Gain Control (AREA)
  • Noise Elimination (AREA)

Abstract

PURPOSE:To eliminate the radio interference well, by generating plural control signals, which change the gain control quantity of a gain control device in accordance with the differential frequency between a desired receiving frequency and the frequency of disturbing radio waves, from a control device to the desired receiving frequency. CONSTITUTION:A desired receiving frequency is indicated to a channel selecting device, and disturbing radio waves which give the radio interference to the desired receiving frequency are searched through a level detector 9. Control signals for gain control are given to a gain control device 40 on a basis of the search result by a control device 17. In this case, control signals which are changed in accordance with the difference between the desired receiving frequency and the frequency of disturbing radio waves are given from the control device 17 to the device 40. Thus, the gain control quantity of an antenna input is changed in accordance with the differential frequency to eliminate the radio interference.
JP15377080A 1980-11-04 1980-11-04 Automatic gain control device Granted JPS5778231A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15377080A JPS5778231A (en) 1980-11-04 1980-11-04 Automatic gain control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15377080A JPS5778231A (en) 1980-11-04 1980-11-04 Automatic gain control device

Publications (2)

Publication Number Publication Date
JPS5778231A true JPS5778231A (en) 1982-05-15
JPS6312406B2 JPS6312406B2 (en) 1988-03-18

Family

ID=15569751

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15377080A Granted JPS5778231A (en) 1980-11-04 1980-11-04 Automatic gain control device

Country Status (1)

Country Link
JP (1) JPS5778231A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991001592A1 (en) * 1989-07-15 1991-02-07 Philips Japan, Ltd. Automatic gain control circuit
JPH042137U (en) * 1990-04-18 1992-01-09

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991001592A1 (en) * 1989-07-15 1991-02-07 Philips Japan, Ltd. Automatic gain control circuit
JPH042137U (en) * 1990-04-18 1992-01-09

Also Published As

Publication number Publication date
JPS6312406B2 (en) 1988-03-18

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