JP2007047367A - 能動型騒音制御装置 - Google Patents
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- 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
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- 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
- G10K11/17813—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 acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
- G10K11/17817—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 acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms between the output signals and the error signals, i.e. secondary path
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- 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
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- 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
- G10K11/17825—Error signals
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- 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
- G10K11/1785—Methods, e.g. algorithms; Devices
- G10K11/17853—Methods, e.g. algorithms; Devices of the filter
- G10K11/17854—Methods, e.g. algorithms; Devices of the filter the filter being an adaptive filter
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- 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
- G10K11/17879—General system configurations using both a reference signal and an error signal
- G10K11/17883—General system configurations using both a reference signal and an error signal the reference signal being derived from a machine operating condition, e.g. engine RPM or vehicle speed
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
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Abstract
【解決手段】適応ノッチフィルタのフィルタ係数の上限値の第1閾値W1と下限値の第2閾値W2を設け、第1閾値W1を上回ると制御音をフェードアウト(忘却処理)させ、第2閾値W2を下回ると適応制御処理を再開するように構成したので、音検出器が塞がれてもフィルタ係数W(n)が上限値である第1閾値W1を超えることがないので不快なボー音の発生を防止でき、かつフィルタ係数をゼロ値にしない消音制御を継続しているので塞ぐのをやめたとき直ちに騒音を低減することができる。
【選択図】図7
Description
Cx(n)=cos{2π(f,n)}・ReH(f)
−sin{2π(f、n)}・ImH(f)
Cy(n)=cos{2π(f,n)}・ImH(f)
+sin{2π(f、n)}・ReH(f)
y1(n)=cos{2π(f,n)}・Wx(n)
y2(n)=sin{2π(f,n)}・Wy(n)
14、14A、14B、14R…適応ノッチフィルタ
16…スピーカ(音出力器) 18…マイクロホン(音検出器)
20…参照信号生成回路
22、22A、22B、22R…フィルタ係数更新手段
28…エンジン 41〜44…補正フィルタ
51…第1フィルタ係数更新手段 52…第2フィルタ係数更新手段
54…切替手段 55…閾値設定手段
102…ルーフライニング 104…マイクロホンユニット
Claims (3)
- 騒音源から発生する騒音の周波数から調波の基準信号を出力する基準信号生成器と、
前記基準信号が入力されて、前記騒音を相殺するための制御信号を出力する適応ノッチフィルタと、
前記制御信号を制御音として出力する音出力器と、
前記騒音と前記制御音との相殺誤差音を検出し、誤差信号として出力する音検出器と、
前記音出力器から前記音検出器までの伝達関数を有し、前記基準信号が入力されて参照信号を出力する補正フィルタと、
前記誤差信号と前記参照信号とが入力されて、前記誤差信号が最小となるように前記適応ノッチフィルタのフィルタ係数を逐次更新する第1フィルタ係数更新手段と、
前記適応ノッチフィルタの更新前のフィルタ係数に1未満の所定値を乗算して更新する第2フィルタ係数更新手段と、
前記第1フィルタ係数更新手段と前記第2フィルタ係数更新手段とを択一的に切り替え前記フィルタ係数を前記適応ノッチフィルタに供給する切替手段とを備え、
前記切替手段は、前記フィルタ係数が第1閾値を上回ると前記第2フィルタ係数更新手段に切り替えるとともに、前記フィルタ係数が前記第1閾値より小さい第2閾値を下回ると前記第1フィルタ係数更新手段に切り替える
ことを特徴とする能動型騒音制御装置。 - 請求項1記載の能動型騒音制御装置において、
前記基準信号生成器は、
前記調波の基準信号として、基準正弦波信号と基準余弦波信号とを出力し、
前記適応ノッチフィルタは、
前記基準余弦波信号に基づいて第1制御信号を出力する第1適応ノッチフィルタと、前記基準正弦波信号に基づいて第2制御信号を出力する第2適応ノッチフィルタとで構成され、
前記第1制御信号と前記第2信号とが加算器により加算されて前記制御信号が生成されて前記音出力器に入力され、
前記切替手段は、
前記第1適応ノッチフィルタ及び前記第2適応ノッチフィルタにそれぞれ供給されるフィルタ係数の何れか一方が前記第1閾値を上回ると前記第1適応ノッチフィルタ及び前記第2適応ノッチフィルタの両方とも前記第2フィルタ係数更新手段に切り替えるとともに、前記第1適応ノッチフィルタ及び前記第2適応ノッチフィルタにそれぞれ供給されるフィルタ係数の何れか一方が前記第2閾値を下回ると前記第1フィルタ係数更新手段に切り替える
ことを特徴とする能動型騒音制御装置。 - 請求項1又は2記載の能動型騒音制御装置において、
前記第1閾値及び前記第2閾値は、前記基準信号の周波数に応じて変化させる
ことを特徴とする能動型騒音制御装置。
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JP2005230552A JP4262703B2 (ja) | 2005-08-09 | 2005-08-09 | 能動型騒音制御装置 |
US11/500,418 US7792312B2 (en) | 2005-08-09 | 2006-08-08 | Active noise control system |
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JP2005230552A JP4262703B2 (ja) | 2005-08-09 | 2005-08-09 | 能動型騒音制御装置 |
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JP2007047367A true JP2007047367A (ja) | 2007-02-22 |
JP4262703B2 JP4262703B2 (ja) | 2009-05-13 |
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JP2005230552A Expired - Fee Related JP4262703B2 (ja) | 2005-08-09 | 2005-08-09 | 能動型騒音制御装置 |
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JP (1) | JP4262703B2 (ja) |
Cited By (12)
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JP2009298337A (ja) * | 2008-06-16 | 2009-12-24 | Honda Motor Co Ltd | 能動型騒音制御装置 |
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