JPS55104143A - Signal processor - Google Patents

Signal processor

Info

Publication number
JPS55104143A
JPS55104143A JP1168079A JP1168079A JPS55104143A JP S55104143 A JPS55104143 A JP S55104143A JP 1168079 A JP1168079 A JP 1168079A JP 1168079 A JP1168079 A JP 1168079A JP S55104143 A JPS55104143 A JP S55104143A
Authority
JP
Japan
Prior art keywords
resistor
changing rate
control circuit
output
circuit
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
JP1168079A
Other languages
Japanese (ja)
Inventor
Katsuhisa Nishimura
Seiji Fujisawa
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP1168079A priority Critical patent/JPS55104143A/en
Publication of JPS55104143A publication Critical patent/JPS55104143A/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
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/002—Volume compression or expansion in amplifiers in untuned or low-frequency amplifiers, e.g. audio amplifiers
    • H03G7/004—Volume compression or expansion in amplifiers in untuned or low-frequency amplifiers, e.g. audio amplifiers using continuously variable impedance devices

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

PURPOSE:To enable to adjust the changing rate and the output level of a control signal simply, by constituting an automatic gain adjustment circuit in a control circuit. CONSTITUTION:The DC signal obtained at the rectifying circuit 8 is fed to the variable resistance element 2 in the control circuit 3' and also fed to the transistor 10 through the resistor 11. Accordingly, the resistance value between the collector and emitter of the transistor 10 is changed smaller as the output voltage increases. Since the output amplitude of the amplifier 9 is reduced when the rectified output is increased, the changing rate of the DC output voltage of the rectifying circuit 8 is very smaller in comparison with the changing rate of the input signal of the control circuit. Accordingly, by adjusting the resistor 11, the compression performamce can be adjusting the resistor 11, a compression performance can be adjusted to a given state even with the characteristics of variable resistance element 2 in dispersion.
JP1168079A 1979-02-02 1979-02-02 Signal processor Pending JPS55104143A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1168079A JPS55104143A (en) 1979-02-02 1979-02-02 Signal processor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1168079A JPS55104143A (en) 1979-02-02 1979-02-02 Signal processor

Publications (1)

Publication Number Publication Date
JPS55104143A true JPS55104143A (en) 1980-08-09

Family

ID=11784703

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1168079A Pending JPS55104143A (en) 1979-02-02 1979-02-02 Signal processor

Country Status (1)

Country Link
JP (1) JPS55104143A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58141018A (en) * 1982-02-17 1983-08-22 Nec Corp Automatic gain control circuit
JPS6022017U (en) * 1983-07-22 1985-02-15 日立電子株式会社 automatic power control circuit
JPS6048609A (en) * 1983-08-27 1985-03-16 Rohm Co Ltd Automatic level adjusting circuit
JPS6465910A (en) * 1987-09-04 1989-03-13 Nippon Electric Ic Microcomput Signal compressing/expanding device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58141018A (en) * 1982-02-17 1983-08-22 Nec Corp Automatic gain control circuit
JPS6022017U (en) * 1983-07-22 1985-02-15 日立電子株式会社 automatic power control circuit
JPS6048609A (en) * 1983-08-27 1985-03-16 Rohm Co Ltd Automatic level adjusting circuit
JPH0326565B2 (en) * 1983-08-27 1991-04-11 Rohm Kk
JPS6465910A (en) * 1987-09-04 1989-03-13 Nippon Electric Ic Microcomput Signal compressing/expanding device

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