JPS5778232A - Automatic gain control device - Google Patents

Automatic gain control device

Info

Publication number
JPS5778232A
JPS5778232A JP15377180A JP15377180A JPS5778232A JP S5778232 A JPS5778232 A JP S5778232A JP 15377180 A JP15377180 A JP 15377180A JP 15377180 A JP15377180 A JP 15377180A JP S5778232 A JPS5778232 A JP S5778232A
Authority
JP
Japan
Prior art keywords
frequency
radio interference
disturbing
radio
accordance
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
JP15377180A
Other languages
Japanese (ja)
Other versions
JPS6312407B2 (en
Inventor
Akinori Maeda
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 JP15377180A priority Critical patent/JPS5778232A/en
Publication of JPS5778232A publication Critical patent/JPS5778232A/en
Publication of JPS6312407B2 publication Critical patent/JPS6312407B2/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 effectively, by changing the detection level of a level detector in accordance with the differential frequency between a desired frequency and the frequency of disturbing radio waves causing the radio interference. 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 40, and a series of operations where control signal for gain control are given in accordance with the search result is performed by a control device 17. The detection level of the detector 40 is changed to plural steps in accordance with the differential frequency between the desired receiving frequency and the frequency of disturbing radio waves causing the radio interference. Thus, conventional troubles, where the gain of an antenna input is controlled through disturbing radio waves are separated from the desired receiving frequency and do not reach the level of the radio interference, are eliminated to eliminate the radio interference effectively.
JP15377180A 1980-11-04 1980-11-04 Automatic gain control device Granted JPS5778232A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15377180A JPS5778232A (en) 1980-11-04 1980-11-04 Automatic gain control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15377180A JPS5778232A (en) 1980-11-04 1980-11-04 Automatic gain control device

Publications (2)

Publication Number Publication Date
JPS5778232A true JPS5778232A (en) 1982-05-15
JPS6312407B2 JPS6312407B2 (en) 1988-03-18

Family

ID=15569773

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15377180A Granted JPS5778232A (en) 1980-11-04 1980-11-04 Automatic gain control device

Country Status (1)

Country Link
JP (1) JPS5778232A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015170889A (en) * 2014-03-05 2015-09-28 パナソニック株式会社 Radio communication equipment and disturbing wave detection method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2075426T3 (en) * 1991-01-07 1995-10-01 Michelin & Cie MOTORCYCLE TIRES.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015170889A (en) * 2014-03-05 2015-09-28 パナソニック株式会社 Radio communication equipment and disturbing wave detection method

Also Published As

Publication number Publication date
JPS6312407B2 (en) 1988-03-18

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