JPS5541013A - Gain control circuit - Google Patents

Gain control circuit

Info

Publication number
JPS5541013A
JPS5541013A JP11360978A JP11360978A JPS5541013A JP S5541013 A JPS5541013 A JP S5541013A JP 11360978 A JP11360978 A JP 11360978A JP 11360978 A JP11360978 A JP 11360978A JP S5541013 A JPS5541013 A JP S5541013A
Authority
JP
Japan
Prior art keywords
pass filter
low pass
control circuit
gain control
digital
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
JP11360978A
Other languages
Japanese (ja)
Inventor
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 JP11360978A priority Critical patent/JPS5541013A/en
Publication of JPS5541013A publication Critical patent/JPS5541013A/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
    • H03G3/001—Digital control of analog signals

Abstract

PURPOSE:To remarkably improve the impulse noise by softening the leading characteristics of the control voltage, through the insertion of a low pass filter between the digital control signal and the gain control circuit. CONSTITUTION:The digital outputs D1 to D16 from the digital control signal generator 13 are converted into analog voltage with the D/A converter and fed to the transistors 6 and 7 via the low pass filter 15 as the control voltage. In this case, the low pass filter 15 softens the stepwise change in the control voltage. Accordingly, the impulse noise can remarkably be improved.
JP11360978A 1978-09-18 1978-09-18 Gain control circuit Pending JPS5541013A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11360978A JPS5541013A (en) 1978-09-18 1978-09-18 Gain control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11360978A JPS5541013A (en) 1978-09-18 1978-09-18 Gain control circuit

Publications (1)

Publication Number Publication Date
JPS5541013A true JPS5541013A (en) 1980-03-22

Family

ID=14616548

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11360978A Pending JPS5541013A (en) 1978-09-18 1978-09-18 Gain control circuit

Country Status (1)

Country Link
JP (1) JPS5541013A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57148335A (en) * 1981-03-10 1982-09-13 Matsushita Electric Ind Co Ltd Capacitor
US4885547A (en) * 1988-07-07 1989-12-05 Tektronix, Inc. Gain cell with digital control

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57148335A (en) * 1981-03-10 1982-09-13 Matsushita Electric Ind Co Ltd Capacitor
JPS6336126B2 (en) * 1981-03-10 1988-07-19 Matsushita Electric Ind Co Ltd
US4885547A (en) * 1988-07-07 1989-12-05 Tektronix, Inc. Gain cell with digital control

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