JP4458968B2 - 自動レベル調整回路 - Google Patents
自動レベル調整回路 Download PDFInfo
- Publication number
- JP4458968B2 JP4458968B2 JP2004216235A JP2004216235A JP4458968B2 JP 4458968 B2 JP4458968 B2 JP 4458968B2 JP 2004216235 A JP2004216235 A JP 2004216235A JP 2004216235 A JP2004216235 A JP 2004216235A JP 4458968 B2 JP4458968 B2 JP 4458968B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- output
- level
- circuit
- gain
- 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.)
- Expired - Fee Related
Links
- 238000001514 detection method Methods 0.000 claims description 74
- 230000005236 sound signal Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 7
- 230000003247 decreasing effect Effects 0.000 description 4
- 238000011084 recovery Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
-
- 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
- H03G3/3026—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being discontinuously variable, e.g. controlled by switching
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Control Of Amplification And Gain Control (AREA)
Description
Claims (1)
- 入力信号を設定ゲインにより増幅するゲイン可変アンプと、
このゲイン可変アンプの出力の信号レベルと所定の基準レベルとを比較し、その比較結果を比較結果信号として出力する比較出力回路と、
前記入力信号の1つのゼロクロスともう1つのゼロクロスとの間に出力された前記比較結果信号の内、所定の出力時間内に出力された分の比較結果信号を出力するように制限する出力信号制限回路と、
前記比較出力回路からの出力信号を、前記比較結果信号が前記所定出力時間以上にわたり出力された場合には前記所定出力時間内に出力された分の比較結果信号を出力するよう制限し、アタック検出出力信号として出力するアタック検出出力回路と、
を含むことを特徴とする自動レベル調整回路。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004216235A JP4458968B2 (ja) | 2004-07-23 | 2004-07-23 | 自動レベル調整回路 |
TW094117770A TWI287352B (en) | 2004-07-23 | 2005-05-31 | Automatic level adjusting circuit |
CN2005100820571A CN1725634B (zh) | 2004-07-23 | 2005-07-05 | 自动电平调整电路 |
KR1020050066102A KR100641258B1 (ko) | 2004-07-23 | 2005-07-21 | 자동 레벨 조정 회로 |
US11/187,281 US7298212B2 (en) | 2004-07-23 | 2005-07-22 | Automatic level control circuit with improved attack action |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004216235A JP4458968B2 (ja) | 2004-07-23 | 2004-07-23 | 自動レベル調整回路 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2006041734A JP2006041734A (ja) | 2006-02-09 |
JP4458968B2 true JP4458968B2 (ja) | 2010-04-28 |
Family
ID=35656500
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2004216235A Expired - Fee Related JP4458968B2 (ja) | 2004-07-23 | 2004-07-23 | 自動レベル調整回路 |
Country Status (5)
Country | Link |
---|---|
US (1) | US7298212B2 (ja) |
JP (1) | JP4458968B2 (ja) |
KR (1) | KR100641258B1 (ja) |
CN (1) | CN1725634B (ja) |
TW (1) | TWI287352B (ja) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7760024B2 (en) * | 2005-10-07 | 2010-07-20 | Cisco Technology, Inc | System and method for increasing accuracy of transmitter power detection over a larger range of output power levels |
JP2009153007A (ja) * | 2007-12-21 | 2009-07-09 | Fujitsu Microelectronics Ltd | 自動利得制御増幅器及びそれを有する音声記録装置 |
US8258870B2 (en) * | 2009-08-14 | 2012-09-04 | That Corporation | System and method for digital control of amplifier gain with reduced zipper noise |
EP2317647B1 (en) * | 2009-10-30 | 2015-12-16 | ST-Ericsson SA | Threshold crossing detection |
JP2011130341A (ja) * | 2009-12-21 | 2011-06-30 | Oki Semiconductor Co Ltd | 信号処理装置及び信号処理方法 |
US9647620B2 (en) | 2010-01-17 | 2017-05-09 | Mediatek Pte Ltd. | Electronic device and integrated circuit comprising a gain control module and method therefor |
CN102377398B (zh) * | 2010-08-16 | 2014-02-12 | 成都芯源***有限公司 | 一种增益跨零控制***和增益控制方法 |
CN103825568B (zh) * | 2010-08-16 | 2016-09-14 | 成都芯源***有限公司 | 一种自动增益控制***及其方法 |
TW201218621A (en) * | 2010-10-29 | 2012-05-01 | Anpec Electronics Corp | Device and method for signal amplification |
JP2012134804A (ja) * | 2010-12-22 | 2012-07-12 | Lapis Semiconductor Co Ltd | 音声信号の自動レベル調整回路 |
TW201236365A (en) * | 2011-02-25 | 2012-09-01 | Novatek Microelectronics Corp | Method and device of automatic gain control |
US10514016B1 (en) * | 2018-07-25 | 2019-12-24 | Semiconductor Components Industries, Llc | Circuit and method for soft shutdown of a coil |
US11743666B2 (en) * | 2020-12-30 | 2023-08-29 | Knowles Electronics, Llc. | Microphone assembly with transducer sensitivity drift compensation and electrical circuit therefor |
US11671775B2 (en) * | 2020-12-30 | 2023-06-06 | Knowles Electronics, Llc | Microphone assembly with transducer sensitivity drift compensation and electrical circuit therefor |
TWI770918B (zh) * | 2021-03-31 | 2022-07-11 | 新唐科技股份有限公司 | 設定值自動調整裝置和方法 |
CN113271075B (zh) * | 2021-04-16 | 2022-10-04 | 成都振芯科技股份有限公司 | 一种基于收发时分复用的自动增益控制装置及方法 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5610721A (en) | 1979-07-09 | 1981-02-03 | Nec Corp | Amplitude limiting device |
US5003270A (en) * | 1988-06-17 | 1991-03-26 | Novatel Communications Ltd. | RF power-control circuit |
US5423081A (en) * | 1993-08-16 | 1995-06-06 | Hughes Aircraft Company | Cellular power amplifier power level control circuitry |
US5742201A (en) * | 1996-01-30 | 1998-04-21 | Spectrian | Polar envelope correction mechanism for enhancing linearity of RF/microwave power amplifier |
JPH11243323A (ja) | 1998-02-26 | 1999-09-07 | Sanyo Electric Co Ltd | 増幅回路の制御回路 |
JPH11328855A (ja) | 1998-05-15 | 1999-11-30 | Sony Corp | 自動利得制御の調整方法及び装置、並びに復号回路 |
JP3552585B2 (ja) | 1999-04-27 | 2004-08-11 | 三菱電機株式会社 | Alc回路 |
US6670849B1 (en) * | 2000-08-30 | 2003-12-30 | Skyworks Solutions, Inc. | System for closed loop power control using a linear or a non-linear power amplifier |
JP3937898B2 (ja) | 2002-04-11 | 2007-06-27 | ヤマハ株式会社 | 利得可変装置 |
US6924698B2 (en) | 2003-07-31 | 2005-08-02 | Agilent Technologies, Inc. | Power detector for mismatched load |
-
2004
- 2004-07-23 JP JP2004216235A patent/JP4458968B2/ja not_active Expired - Fee Related
-
2005
- 2005-05-31 TW TW094117770A patent/TWI287352B/zh not_active IP Right Cessation
- 2005-07-05 CN CN2005100820571A patent/CN1725634B/zh not_active Expired - Fee Related
- 2005-07-21 KR KR1020050066102A patent/KR100641258B1/ko not_active IP Right Cessation
- 2005-07-22 US US11/187,281 patent/US7298212B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
TW200623617A (en) | 2006-07-01 |
JP2006041734A (ja) | 2006-02-09 |
CN1725634B (zh) | 2010-05-05 |
TWI287352B (en) | 2007-09-21 |
US7298212B2 (en) | 2007-11-20 |
KR100641258B1 (ko) | 2006-11-03 |
KR20060053965A (ko) | 2006-05-22 |
US20060017507A1 (en) | 2006-01-26 |
CN1725634A (zh) | 2006-01-25 |
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