JPS5723309A - Electric power amplifying circuit of pulse width modulation system - Google Patents
Electric power amplifying circuit of pulse width modulation systemInfo
- Publication number
- JPS5723309A JPS5723309A JP9804380A JP9804380A JPS5723309A JP S5723309 A JPS5723309 A JP S5723309A JP 9804380 A JP9804380 A JP 9804380A JP 9804380 A JP9804380 A JP 9804380A JP S5723309 A JPS5723309 A JP S5723309A
- Authority
- JP
- Japan
- Prior art keywords
- electric power
- circuit
- power source
- positive
- circuits
- 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
Landscapes
- Amplifiers (AREA)
Abstract
PURPOSE: To reduce a loss of a circuit and to elevate an efficiency of electric power, by usually switching an electric power source by a pulse width modulation output, and directly applying the electric power source to an electric power amplifying circuit in case when a sound input exceeds a prescribed value.
CONSTITUTION: Sound inputs In are amplified by buffer amplifiers 22, 23, voltage amplifiers 24, 25 and electric power amplifiers 30, 31, respectively. Subsequently, only a positive wave of each sound signal and only a negative wave are detected by rectifying circuits 34, 35, and rectifying circuits 38, 39, respectively. In the positive wave side, outputs of the rectifying circuits 34, 35 are inputted to a PWM modulating circuit 37 through a low-pass filter 36, are amplified by a pulse amplifying circuit 42, and electric power of a positive electric power source 43 is switched by a main controlling circuit 44. An output of this main controlling circuit 44 is provided to the electric power amplifying circuits 30, 31. Also, when a sound signal has exceeded a prescribed value, operation of the PWM modulating circuit 37 is stopped by an output of a signal detecting circuit 52, voltage of the positive electric power source 43 is directly applied to the electric power amplifying circuits 30, 31. In this regard, the negative wave side is also operated in the same way.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9804380A JPS5723309A (en) | 1980-07-16 | 1980-07-16 | Electric power amplifying circuit of pulse width modulation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9804380A JPS5723309A (en) | 1980-07-16 | 1980-07-16 | Electric power amplifying circuit of pulse width modulation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5723309A true JPS5723309A (en) | 1982-02-06 |
Family
ID=14209090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9804380A Pending JPS5723309A (en) | 1980-07-16 | 1980-07-16 | Electric power amplifying circuit of pulse width modulation system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5723309A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62274906A (en) * | 1986-05-23 | 1987-11-28 | Nippon Telegr & Teleph Corp <Ntt> | High frequency amplifier |
| US5200711A (en) * | 1990-10-26 | 1993-04-06 | AB Lab. Gruppen Andersson & Bavholm | Pulse-width modulated, linear audio-power amplifier |
| US5396194A (en) * | 1993-11-19 | 1995-03-07 | Carver Corporation | Audio frequency power amplifiers |
| US5990751A (en) * | 1997-10-16 | 1999-11-23 | Nikon Corporation | Method and apparatus for improving power transfer efficiency of an amplifier system |
| KR100528107B1 (en) * | 1996-11-19 | 2006-02-02 | 산요덴키가부시키가이샤 | Power amplifying apparatus |
| US7498876B2 (en) * | 2005-06-20 | 2009-03-03 | Agere Systems Inc. | Amplifier having half-wave tracking power rails |
| JP2011515918A (en) * | 2008-03-03 | 2011-05-19 | クゥアルコム・インコーポレイテッド | System and method for reducing power consumption for audio playback |
| US8717211B2 (en) | 2010-11-30 | 2014-05-06 | Qualcomm Incorporated | Adaptive gain adjustment system |
| WO2015156976A1 (en) * | 2014-04-11 | 2015-10-15 | Qualcomm Incorporated | Fm filtering for class-g/h headphones |
-
1980
- 1980-07-16 JP JP9804380A patent/JPS5723309A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62274906A (en) * | 1986-05-23 | 1987-11-28 | Nippon Telegr & Teleph Corp <Ntt> | High frequency amplifier |
| JPH0669002B2 (en) * | 1986-05-23 | 1994-08-31 | 日本電信電話株式会社 | High frequency amplifier |
| US5200711A (en) * | 1990-10-26 | 1993-04-06 | AB Lab. Gruppen Andersson & Bavholm | Pulse-width modulated, linear audio-power amplifier |
| US5396194A (en) * | 1993-11-19 | 1995-03-07 | Carver Corporation | Audio frequency power amplifiers |
| KR100528107B1 (en) * | 1996-11-19 | 2006-02-02 | 산요덴키가부시키가이샤 | Power amplifying apparatus |
| US5990751A (en) * | 1997-10-16 | 1999-11-23 | Nikon Corporation | Method and apparatus for improving power transfer efficiency of an amplifier system |
| US7498876B2 (en) * | 2005-06-20 | 2009-03-03 | Agere Systems Inc. | Amplifier having half-wave tracking power rails |
| JP2011515918A (en) * | 2008-03-03 | 2011-05-19 | クゥアルコム・インコーポレイテッド | System and method for reducing power consumption for audio playback |
| US9425747B2 (en) | 2008-03-03 | 2016-08-23 | Qualcomm Incorporated | System and method of reducing power consumption for audio playback |
| US8717211B2 (en) | 2010-11-30 | 2014-05-06 | Qualcomm Incorporated | Adaptive gain adjustment system |
| WO2015156976A1 (en) * | 2014-04-11 | 2015-10-15 | Qualcomm Incorporated | Fm filtering for class-g/h headphones |
| US9326073B2 (en) | 2014-04-11 | 2016-04-26 | Qualcomm Incorporated | FM filtering for class-G/H headphones |
| CN106165293A (en) * | 2014-04-11 | 2016-11-23 | 高通股份有限公司 | Filter for the FM of G/H class earphone |
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