JP7332557B2 - クリップ検出回路 - Google Patents
クリップ検出回路 Download PDFInfo
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- JP7332557B2 JP7332557B2 JP2020153062A JP2020153062A JP7332557B2 JP 7332557 B2 JP7332557 B2 JP 7332557B2 JP 2020153062 A JP2020153062 A JP 2020153062A JP 2020153062 A JP2020153062 A JP 2020153062A JP 7332557 B2 JP7332557 B2 JP 7332557B2
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- detection circuit
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- 238000001514 detection method Methods 0.000 title claims description 81
- 238000006243 chemical reaction Methods 0.000 claims description 9
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- 101000910488 Homo sapiens Cyclin-T1 Proteins 0.000 description 25
- 238000010586 diagram Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005236 sound signal Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/217—Class D power amplifiers; Switching amplifiers
- H03F3/2171—Class D power amplifiers; Switching amplifiers with field-effect devices
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/52—Circuit arrangements for protecting such amplifiers
- H03F1/523—Circuit arrangements for protecting such amplifiers for amplifiers using field-effect devices
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/217—Class D power amplifiers; Switching amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
- H03G11/008—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general of digital or coded signals
-
- 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
- H03G3/301—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable
- H03G3/3021—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable by varying the duty cycle
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/03—Indexing scheme relating to amplifiers the amplifier being designed for audio applications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/351—Pulse width modulation being used in an amplifying circuit
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/66—Clipping circuitry being present in an amplifier, i.e. the shape of the signal being modified
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Amplifiers (AREA)
Description
図1は、第1の実施形態のクリップ検出回路の構成を示す図である。本実施形態のクリップ検出回路は、ゼロクロス検知回路15と、ロジック回路部30と、D級アンプ50と、クリップ検知回路60を有する。ロジック回路部30は、非クリップ時間カウンタ32、クリップ時間カウンタ33、制御回路34を有する。
CLIP_TH=CLIP_RATIO×NCCNT ・・・ (3)
Claims (6)
- 入力信号のゼロクロス点を検知してゼロクロス信号を出力するゼロクロス検知回路と、
前記入力信号をPWM信号に変換して出力する出力回路と、
前記出力回路の出力がクリップした状態を検知してクリップ検知信号を出力するクリップ検知回路と、
前記出力回路の出力がクリップした状態のクリップ時間が、前記ゼロクロス信号が出力された時点から前記クリップ検知信号が出力される時点までの非クリップ時間に対する前記クリップ時間の比によって設定されたしきい値の条件を満たす状態になった場合にクリップ状態であると判定する制御回路と、
を具備することを特徴とするクリップ検出回路。 - 前記出力回路は、
前記入力信号に応答して前記PWM信号を出力するD級アンプであることを特徴とする請求項1に記載のクリップ検出回路。 - 前記ゼロクロス信号と基準クロック信号に応答して前記非クリップ時間を計測する第1のカウンタと、
前記クリップ検知信号と前記基準クロック信号に応答して前記クリップ時間を計測する第2のカウントと、
を具備することを特徴とする請求項2に記載のクリップ検出回路。 - 前記しきい値の条件は、
前記非クリップ時間に対する前記クリップ時間の比によって設定することを特徴とする請求項1から3のいずれか一項に記載のクリップ検出回路。 - 前記入力信号はデジタル信号であり、
前記デジタル信号をアナログ信号に変換して出力するDA変換回路を備え、
前記ゼロクロス検知回路は、
前記DA変換回路の出力のゼロクロス点を検知することを特徴とする請求項1から4のいずれか一項に記載のクリップ検出回路。 - 前記入力信号は、2の補数表現された信号フォーマットを有するデジタル信号で有り、
前記ゼロクロス検知回路は、前記入力信号の符号を示すデータが反転したことを検知する符号反転検知回路を具備することを特徴とする請求項1から4のいずれか一項に記載のクリップ検出回路。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2020153062A JP7332557B2 (ja) | 2020-09-11 | 2020-09-11 | クリップ検出回路 |
US17/410,407 US11736082B2 (en) | 2020-09-11 | 2021-08-24 | Clipping state detecting circuit and clipping state detecting method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2020153062A JP7332557B2 (ja) | 2020-09-11 | 2020-09-11 | クリップ検出回路 |
Publications (2)
Publication Number | Publication Date |
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JP2022047255A JP2022047255A (ja) | 2022-03-24 |
JP7332557B2 true JP7332557B2 (ja) | 2023-08-23 |
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JP2020153062A Active JP7332557B2 (ja) | 2020-09-11 | 2020-09-11 | クリップ検出回路 |
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US (1) | US11736082B2 (ja) |
JP (1) | JP7332557B2 (ja) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009239504A (ja) | 2008-03-26 | 2009-10-15 | Yamaha Corp | 自励式d級増幅器のクリップ検出回路 |
JP2011066558A (ja) | 2009-09-15 | 2011-03-31 | Yamaha Corp | D級増幅器 |
JP2011211389A (ja) | 2010-03-29 | 2011-10-20 | Yamaha Corp | 増幅回路、増幅回路のクリップ検出方法 |
JP2018137576A (ja) | 2017-02-21 | 2018-08-30 | 株式会社東芝 | D級アンプ |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7778324B2 (en) | 2005-11-18 | 2010-08-17 | Harman International Industries, Incorporated | System for dynamic time offsetting in interleaved power amplifiers |
US8917143B2 (en) * | 2012-11-08 | 2014-12-23 | Nuvoton Technology Corporation | Method and apparatus for filter-less analog input class D audio amplifier clipping |
US9929703B1 (en) * | 2016-09-27 | 2018-03-27 | Cirrus Logic, Inc. | Amplifier with configurable final output stage |
WO2018120072A1 (en) * | 2016-12-30 | 2018-07-05 | Texas Instruments Incorporated | Total harmonic distortion (thd) controlled clip detector and automatic gain limiter (agl) |
JP6904179B2 (ja) * | 2017-09-06 | 2021-07-14 | ヤマハ株式会社 | 増幅器、音響機器および制御方法 |
JP7273484B2 (ja) * | 2018-11-16 | 2023-05-15 | 株式会社東芝 | 信号生成回路 |
-
2020
- 2020-09-11 JP JP2020153062A patent/JP7332557B2/ja active Active
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2021
- 2021-08-24 US US17/410,407 patent/US11736082B2/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009239504A (ja) | 2008-03-26 | 2009-10-15 | Yamaha Corp | 自励式d級増幅器のクリップ検出回路 |
JP2011066558A (ja) | 2009-09-15 | 2011-03-31 | Yamaha Corp | D級増幅器 |
JP2011211389A (ja) | 2010-03-29 | 2011-10-20 | Yamaha Corp | 増幅回路、増幅回路のクリップ検出方法 |
JP2018137576A (ja) | 2017-02-21 | 2018-08-30 | 株式会社東芝 | D級アンプ |
Also Published As
Publication number | Publication date |
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JP2022047255A (ja) | 2022-03-24 |
US11736082B2 (en) | 2023-08-22 |
US20220085783A1 (en) | 2022-03-17 |
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