JP4942555B2 - ノイズキャンセルヘッドホン - Google Patents
ノイズキャンセルヘッドホン Download PDFInfo
- Publication number
- JP4942555B2 JP4942555B2 JP2007147455A JP2007147455A JP4942555B2 JP 4942555 B2 JP4942555 B2 JP 4942555B2 JP 2007147455 A JP2007147455 A JP 2007147455A JP 2007147455 A JP2007147455 A JP 2007147455A JP 4942555 B2 JP4942555 B2 JP 4942555B2
- Authority
- JP
- Japan
- Prior art keywords
- noise
- signal
- input
- attenuator
- amplifier
- 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
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
- G10K11/17821—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
- G10K11/17823—Reference signals, e.g. ambient acoustic environment
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1783—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions
- G10K11/17833—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions by using a self-diagnostic function or a malfunction prevention function, e.g. detecting abnormal output levels
- G10K11/17835—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions by using a self-diagnostic function or a malfunction prevention function, e.g. detecting abnormal output levels using detection of abnormal input signals
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1787—General system configurations
- G10K11/17873—General system configurations using a reference signal without an error signal, e.g. pure feedforward
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/10—Applications
- G10K2210/108—Communication systems, e.g. where useful sound is kept and noise is cancelled
- G10K2210/1081—Earphones, e.g. for telephones, ear protectors or headsets
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/50—Miscellaneous
- G10K2210/503—Diagnostics; Stability; Alarms; Failsafe
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Circuit For Audible Band Transducer (AREA)
- Headphones And Earphones (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Description
15 信号検出器
16 減衰器
17 増幅器
Claims (5)
- 周囲の騒音を電気信号に変換するマイクロホンと、マイクロホンで変換される騒音信号の位相を反転させてキャンセル信号を生成するキャンセル信号生成手段と、オーディオ信号と上記キャンセル信号を混合して信号・音響変換素子に入力する混合器と、を備えるノイズキャンセルヘッドホンにおいて、
上記キャンセル信号生成手段は、
上記騒音信号が過大入力であるか否かを判定する判定手段、
上記判定手段が過大入力であると判定した騒音信号を減衰させる減衰器、
上記判定手段が過大入力であると判定し、減衰された騒音信号によって生成されたキャンセル信号を増幅する増幅器を有することを特徴とするノイズキャンセルヘッドホン。 - 上記増幅器は、上記減衰器における減衰量のみを増幅させることを特徴とする請求項1記載のノイズキャンセルヘッドホン。
- 上記減衰器における減衰率は、固定値であることを特徴とする請求項1または2に記載のノイズキャンセルヘッドホン。
- 上記増幅器における増幅率は、固定値であることを特徴とする請求項1または2に記載のノイズキャンセルヘッドホン。
- 上記減衰器における減衰率は、騒音信号の入力レベルに応じて可変する値であって、上記増幅器における増幅率は、減衰器における減衰率に同期して可変する値であることを特徴とする請求項1に記載のノイズキャンセルヘッドホン。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007147455A JP4942555B2 (ja) | 2007-06-01 | 2007-06-01 | ノイズキャンセルヘッドホン |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007147455A JP4942555B2 (ja) | 2007-06-01 | 2007-06-01 | ノイズキャンセルヘッドホン |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2008301376A JP2008301376A (ja) | 2008-12-11 |
JP4942555B2 true JP4942555B2 (ja) | 2012-05-30 |
Family
ID=40174426
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2007147455A Expired - Fee Related JP4942555B2 (ja) | 2007-06-01 | 2007-06-01 | ノイズキャンセルヘッドホン |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP4942555B2 (ja) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4775438B2 (ja) * | 2008-12-26 | 2011-09-21 | 日本ビクター株式会社 | ヘッドホン |
US20100278355A1 (en) * | 2009-04-29 | 2010-11-04 | Yamkovoy Paul G | Feedforward-Based ANR Adjustment Responsive to Environmental Noise Levels |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09331377A (ja) * | 1996-06-12 | 1997-12-22 | Nec Corp | ノイズキャンセル回路 |
JPH1066185A (ja) * | 1996-08-21 | 1998-03-06 | Sony Corp | 自動音量調整装置 |
JP2004320167A (ja) * | 2003-04-11 | 2004-11-11 | Matsushita Electric Ind Co Ltd | 通信システム、音声処理装置、音声制御装置及び通信端末装置 |
WO2007046435A1 (ja) * | 2005-10-21 | 2007-04-26 | Matsushita Electric Industrial Co., Ltd. | 騒音制御装置 |
-
2007
- 2007-06-01 JP JP2007147455A patent/JP4942555B2/ja not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JP2008301376A (ja) | 2008-12-11 |
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