JPS56143714A - Low-frequency-range compensating circuit - Google Patents

Low-frequency-range compensating circuit

Info

Publication number
JPS56143714A
JPS56143714A JP4709280A JP4709280A JPS56143714A JP S56143714 A JPS56143714 A JP S56143714A JP 4709280 A JP4709280 A JP 4709280A JP 4709280 A JP4709280 A JP 4709280A JP S56143714 A JPS56143714 A JP S56143714A
Authority
JP
Japan
Prior art keywords
low
output
amplifier
frequency
feedback path
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
JP4709280A
Other languages
Japanese (ja)
Inventor
Shigeyuki Sakimichi
Hiroyuki Nagai
Kaoru Sasabe
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 JP4709280A priority Critical patent/JPS56143714A/en
Publication of JPS56143714A publication Critical patent/JPS56143714A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G9/00—Combinations of two or more types of control, e.g. gain control and tone control
    • H03G9/02—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers

Landscapes

  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)

Abstract

PURPOSE:To compensate the sense of the low frequency range during a low-output period, by feeding back a current flowing through a voice coil and the output of a voice output amplifier by way of LPF and a variable impedance element. CONSTITUTION:The output of voice output amplifier 2 whose output level is varied by sound volume regulator 1 is fed back via the 1st feedback path of resistance 7, the 2nd feedback path of displacing current detecting amplifier 14 which detects the current of the voice coil of speaker 3, and the 3rd feedback path of resistance 21, capacitor 22 and variable impedance element 15 constituting LPF. Element 15 is adjusted by the same regulator 5 as that of sound volume regulation part 1. Through those feedback paths, low-frequency-range compensation is done greatly when the output level is low to compensate the deficiency with respect to the low- frequency range and the extent of the compensation is reduced during a large-output period to prevent an increase in the distortion of the amplifier.
JP4709280A 1980-04-09 1980-04-09 Low-frequency-range compensating circuit Pending JPS56143714A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4709280A JPS56143714A (en) 1980-04-09 1980-04-09 Low-frequency-range compensating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4709280A JPS56143714A (en) 1980-04-09 1980-04-09 Low-frequency-range compensating circuit

Publications (1)

Publication Number Publication Date
JPS56143714A true JPS56143714A (en) 1981-11-09

Family

ID=12765536

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4709280A Pending JPS56143714A (en) 1980-04-09 1980-04-09 Low-frequency-range compensating circuit

Country Status (1)

Country Link
JP (1) JPS56143714A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58125413U (en) * 1982-02-19 1983-08-26 三洋電機株式会社 Sound quality control circuit
JPH03188707A (en) * 1989-12-19 1991-08-16 Pioneer Electron Corp Sound reproducing device
EP1298795A2 (en) * 2001-09-27 2003-04-02 Kabushiki Kaisha Toshiba Variable gain amplifier

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58125413U (en) * 1982-02-19 1983-08-26 三洋電機株式会社 Sound quality control circuit
JPH03188707A (en) * 1989-12-19 1991-08-16 Pioneer Electron Corp Sound reproducing device
EP1298795A2 (en) * 2001-09-27 2003-04-02 Kabushiki Kaisha Toshiba Variable gain amplifier
EP1298795A3 (en) * 2001-09-27 2004-05-06 Kabushiki Kaisha Toshiba Variable gain amplifier
US6909323B2 (en) 2001-09-27 2005-06-21 Kabushiki Kaisha Toshiba Variable gain amplifier

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