JPS56143714A - Low-frequency-range compensating circuit - Google Patents
Low-frequency-range compensating circuitInfo
- 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
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.
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)
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 |
-
1980
- 1980-04-09 JP JP4709280A patent/JPS56143714A/en active Pending
Cited By (5)
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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