JPH06318085A - Noise controller - Google Patents
Noise controllerInfo
- Publication number
- JPH06318085A JPH06318085A JP5106902A JP10690293A JPH06318085A JP H06318085 A JPH06318085 A JP H06318085A JP 5106902 A JP5106902 A JP 5106902A JP 10690293 A JP10690293 A JP 10690293A JP H06318085 A JPH06318085 A JP H06318085A
- Authority
- JP
- Japan
- Prior art keywords
- noise
- signal
- audio
- noise control
- switch
- 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.)
- Withdrawn
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
- G10K11/1787—General system configurations
- G10K11/17875—General system configurations using an error signal without a reference signal, e.g. pure feedback
-
- 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
-
- 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
- G10K11/17827—Desired external signals, e.g. pass-through audio such as music or speech
-
- 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
-
- 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
- G10K11/17885—General system configurations additionally using a desired external signal, e.g. pass-through audio such as music or speech
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- General Health & Medical Sciences (AREA)
- Exhaust Silencers (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は車両に搭載され車室内の
騒音を低減する騒音制御装置に関し、特に本発明ではオ
ーディオとパワーアンプを併用する場合のパワーアンプ
の効率化を図ることに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise control device mounted on a vehicle to reduce the noise in the vehicle interior, and more particularly to the present invention to improve the efficiency of a power amplifier when an audio and a power amplifier are used together.
【０００２】[0002]
【従来の技術】従来このような分野として以下に説明す
るものがあった。図６は従来の騒音制御装置を示す図で
ある。本図に示すように、車両に搭載されたオーディオ
音源１と、該オーディオ音源１の音楽信号等の出力信号
を電力増幅するパワーアンプ２と、該パワーアンプ２に
より駆動されて音楽信号等を再生するスピーカ３とから
なるオーディオ１００に、オーディオ音源１及びパワー
アンプ２の間にミキサ４が設けられる。該ミキサ４はオ
ーディオ音源１の音楽信号等と騒音制御装置１００から
の騒音制御信号とを加算して音楽信号等及び騒音制御信
号をパワーアンプ２を介してスピーカ３により出力する
ようにしてある。前記騒音制御装置２００は車室内に設
けられ騒音制御信号に基づく前記スピーカ３からのキャ
ンセル音と騒音との残留音を検出して誤差信号として電
気信号に変換するマイクロフォン５と、該マイクロフォ
ン５からの誤差信号を増幅する増幅器６と、増幅器６に
接続され騒音と逆位相で等音圧の騒音制御信号を形成し
これを前記ミキサ４、パワーアンプ２、スピーカ３を介
してキャンセル音を出力させる騒音制御部７とを具備す
る。2. Description of the Related Art Heretofore, there has been a field described below as such a field. FIG. 6 is a diagram showing a conventional noise control device. As shown in this figure, an audio sound source 1 mounted on a vehicle, a power amplifier 2 for power-amplifying an output signal such as a music signal of the audio sound source 1, and a music signal driven by the power amplifier 2 to reproduce the music signal and the like. The mixer 4 is provided between the audio source 1 and the power amplifier 2 in the audio 100 including the speaker 3 that operates. The mixer 4 adds the music signal of the audio source 1 and the noise control signal from the noise control device 100, and outputs the music signal and the noise control signal from the speaker 3 via the power amplifier 2. The noise control device 200 is provided in the vehicle compartment and detects a residual sound of the cancel sound and noise from the speaker 3 based on the noise control signal and converts the residual sound into an electric signal as an error signal, and a microphone 5 from the microphone 5. An amplifier 6 for amplifying an error signal, and a noise which is connected to the amplifier 6 and forms a noise control signal having an equal sound pressure in a phase opposite to that of the noise and outputs a cancel sound through the mixer 4, the power amplifier 2 and the speaker 3. And a control unit 7.
【０００３】[0003]
【発明が解決しようとする課題】ところで従来の騒音制
御装置１００ではオーディオを聴いている場合には、常
時オーディオ信号と騒音制御信号とがパワーアンプ２よ
り出力されている。しかしながら、オーディオ音源１か
らの音量が小さい場合には問題がないが、オーディオ音
源１からの音量が騒音をマスキングするレベルに達する
と、騒音が聴感上気にならなくなり、この場合にもパワ
ーアンプ２では騒音制御信号を出力するために働いてお
り騒音制御効果に対して不効率であるという問題があっ
た。By the way, in the conventional noise control device 100, the audio signal and the noise control signal are always output from the power amplifier 2 when listening to the audio. However, when the volume from the audio source 1 is low, there is no problem, but when the volume from the audio source 1 reaches a level at which noise is masked, the noise becomes unnoticeable to the listener. However, there is a problem in that it works to output the noise control signal and is inefficient with respect to the noise control effect.
【０００４】[0004]
【課題を解決するための手段】本発明は前記問題点を解
決するために、オーディオ音源からのオーディオ出力信
号と、騒音との誤差信号を入力する騒音制御部により形
成される騒音制御信号とを合成して、この合成信号をパ
ワーアンプで電力増幅する騒音制御装置に、第１のスイ
ッチ部、第２のスイッチ部及び検出回路を設ける。In order to solve the above problems, the present invention provides an audio output signal from an audio source and a noise control signal formed by a noise control section for inputting an error signal between noise. A noise control device that synthesizes and synthesizes the synthesized signal with a power amplifier is provided with a first switch section, a second switch section, and a detection circuit.
【０００５】前記第１のスイッチ部は前記騒音制御部の
出力をオン／オフするようにしてある。前記第２のスイ
ッチ部は前記騒音制御部の入力及び出力信号を切り換え
るようにしてある。前記検出回路は前記オーディオ音源
及び第２のスイッチの出力をそれぞれ入力し前記オーデ
ィオ出力信号レベル及び騒音制御部の制御信号レベル若
しくは該騒音制御部が動作していない場合には騒音信号
レベルをそれぞれ検出し、オーディオ出力信号レベルに
応じて騒音のマスキングの程度を判断し第１及び第２の
スイッチ部を制御しパワーアンプの出力を制御するよう
にしてある。The first switch section turns on / off the output of the noise control section. The second switch section is adapted to switch the input and output signals of the noise control section. The detection circuit inputs the audio sound source and the output of the second switch, and detects the audio output signal level and the control signal level of the noise control unit or the noise signal level when the noise control unit is not operating. However, the degree of noise masking is determined according to the audio output signal level, the first and second switch sections are controlled, and the output of the power amplifier is controlled.
【０００６】さらに、前記騒音制御部が動作していない
場合には複数の前記騒音信号を入力するようにしてこれ
らの信号レベルを平均化して騒音信号のレベルを形成す
るようにしてある。また、前記オーディオ出力信号が入
力した検出回路でこれを低域周波数領域に制限するよう
にしてある。Further, when the noise control unit is not operating, a plurality of the noise signals are input so that the signal levels thereof are averaged to form the noise signal level. Further, the detection circuit to which the audio output signal is input limits the audio output signal to the low frequency region.
【０００７】[0007]
【作用】本発明の騒音制御装置によれば、前記オーディ
オ出力信号及び騒音信号のレベルをそれぞれ検出して、
オーディオ出力信号レベルに応じて騒音のマスキングの
程度を判断して前記騒音制御部をオン／オフ制御するこ
とによりオーディオ再生音量を考慮して、聴感上、車室
内の騒音を低減することができ、併用するパワーアンプ
を効率良く動作させることができるようになる。さら
に、複数の前記騒音信号を入力しそのレベルを平均化し
て前記騒音レベルを形成することにより、車室内の狭い
空間での音の湾曲を考慮できるようになる。また、前記
オーディオ出力信号を低域周波数領域に制限することに
より、処理量を低減できこのためＤＳＰ規模の低減でき
る。According to the noise control device of the present invention, the levels of the audio output signal and the noise signal are detected,
By determining the degree of noise masking according to the audio output signal level and controlling the noise control unit to turn on / off, the audio playback volume is taken into consideration, and the noise in the vehicle interior can be reduced in terms of hearing. The power amplifier used together can be operated efficiently. Further, by inputting a plurality of the noise signals and averaging the levels thereof to form the noise level, it becomes possible to consider the sound curvature in the narrow space in the vehicle interior. Further, by limiting the audio output signal to the low frequency region, the processing amount can be reduced, and therefore the DSP scale can be reduced.
【０００８】[0008]
【実施例】以下本発明の実施例について図面を参照して
説明する。図１は本発明の実施例に係る騒音制御装置を
使用するオーディオの全体構成例を示す図である。本図
において図４の構成と異なるものは騒音制御装置２０１
におけるスイッチ部８、９と検出回路１０である。この
スイッチ部８は検出回路１０により騒音制御部７の出力
のオン／オフの動作を行う。またスイッチ部９は検出回
路１０により増幅器６及び騒音制御部７の出力を切り換
える動作を行う。前記検出回路８はオーディオ音源１か
らの音楽信号等の出力信号及びスイッチ部９からの騒音
信号を入力し、オーディオ１００がオフ時又はオーディ
オ１００の出力信号が小音量時で車室内騒音が聴感上気
になる場合には前記騒音制御部７をオンにする信号を形
成する。また検出回路１０はオーディオ１００の出力信
号が聴感上騒音の気にならない音量時にはスイッチ部８
により騒音制御部７をオフとする信号を形成する。この
ように騒音制御部７をコントロールすることにより、効
率良くパワーアンプ２を動作させるようにしてある。以
下に検出回路１０を詳細に説明する。図２は図１の検出
回路１０の第１の例を示す例である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an overall configuration example of an audio using a noise control device according to an embodiment of the present invention. In this figure, the difference from the configuration of FIG.
The switch units 8 and 9 and the detection circuit 10 in FIG. The switch section 8 turns on / off the output of the noise control section 7 by the detection circuit 10. Further, the switch unit 9 performs an operation of switching the outputs of the amplifier 6 and the noise control unit 7 by the detection circuit 10. The detection circuit 8 inputs an output signal such as a music signal from the audio sound source 1 and a noise signal from the switch unit 9, and when the audio 100 is turned off or when the output signal of the audio 100 is low, the noise in the vehicle is audible. When anxious, a signal for turning on the noise control unit 7 is formed. Further, the detection circuit 10 switches the output section of the audio 100 when the output signal of the audio 100 is at a volume that does not cause noise in hearing.
A signal for turning off the noise control unit 7 is formed by. By controlling the noise control section 7 in this manner, the power amplifier 2 is operated efficiently. The detection circuit 10 will be described in detail below. FIG. 2 is an example showing a first example of the detection circuit 10 of FIG.
【０００９】本図に示すように、検出回路１０はオーデ
ィオ音源１からのオーディオ出力信号及び増幅器６から
の騒音信号をそれぞれ整流するダイオード等からなる整
流器１１及び１２と、該整流器１１及び１２に接続され
この整流信号をそれぞれ積分して信号レベルを形成する
積分器１３及び１４と、該積分器１３及び１４からの出
力である信号レベルをそれぞれ複数の基準信号と比較す
るコンパレータ１５及び１６と、該コンパレータ１５及
び１６の出力をそれぞれ組み合わせてスイッチ部８、９
へに制御信号を形成するマトリックス１７とを具備す
る。マイクロフォン５は騒音制御部７で誤差検出に使用
されるものを併用し、その数は騒音制御部７の制御ポイ
ント数に応じて複数個設置することもある。前記積分器
１４では、車室内騒音レベルが車室内に設置されるマイ
クロフォン５の出力を結果として時間平均する動作を行
っている。マトリックス１７には、マスキングの度合い
を車室内騒音レベル及びオーディオ出力レベルとの関係
を予め調査しておき、オーディオ出力レベルの組み合わ
せでマスキング発生を判断し、騒音制御のＯＮ／ＯＦＦ
を、後述のように、制御するようにしてある。またオー
ディオ音源１からのオーディオ出力はオーディオ音源１
でのアンプ出力（図示しない）が用いられてもよい。前
述と同様にオーディオ出力は積分器１３により時間平均
される。さらにオーディオ音源１での前記アンプ出力と
のゲイン関係を考慮してプリアンプ出力信号を用いてこ
れを時間平均してもよい。またこれらに限らずオーディ
オ出力としてボリューム位置を用いてもよい。このよう
にして得られたオーディオ出力のレベルは車室内の聴取
位置との関係を考慮して制御に用いられる。As shown in the figure, the detection circuit 10 is connected to the rectifiers 11 and 12 composed of diodes for rectifying the audio output signal from the audio source 1 and the noise signal from the amplifier 6, respectively. Integrators 13 and 14 that integrate the rectified signals to form signal levels, comparators 15 and 16 that compare the signal levels output from the integrators 13 and 14 with a plurality of reference signals, respectively. The outputs of the comparators 15 and 16 are combined, and the switch units 8 and 9 are combined.
And a matrix 17 for forming control signals. The microphone 5 is used together with the one used for error detection in the noise control unit 7, and a plurality of microphones 5 may be installed depending on the number of control points of the noise control unit 7. The integrator 14 performs an operation in which the noise level of the vehicle interior is time-averaged as a result of the output of the microphone 5 installed in the vehicle interior. In the matrix 17, the degree of masking is investigated in advance in relation to the noise level in the vehicle interior and the audio output level, the occurrence of masking is judged by the combination of the audio output levels, and noise control is turned on / off.
Are controlled as described below. Audio output from audio source 1 is audio source 1
The amplifier output (not shown) may be used. As before, the audio output is time averaged by the integrator 13. Further, the preamplifier output signal may be used and time averaged in consideration of the gain relationship with the amplifier output in the audio sound source 1. The volume position may be used as the audio output without being limited to these. The audio output level thus obtained is used for control in consideration of the relationship with the listening position in the vehicle interior.
【００１０】図３は図２のマトリックス１７によるスイ
ッチ部８のＯＮ／ＯＦＦ制御を説明する図である。本図
に示すように、コンパレータ１５には、一例としてオー
ディオ出力信号用の基準電圧を高い方に向けてａ、ｂ、
ｃと設定され、コンパレータ１６には、一例として騒音
信号用の基準電圧を高い方に向けてＡ、Ｂ、Ｃと設定さ
れている。マトリックス１７では、オーディオ出力レベ
ルがａ未満では騒音信号レベルがいずれの範囲にあって
もスイッチ部８をＯＮに騒音制御部７を動作状態にす
る。これは騒音が気になるからである。さらにオーディ
オ出力レベルがａ以上でｂ未満では騒音レベルがＡ未満
にあればスイッチ部８をＯＦＦし騒音制御部７を非動作
状態にする。これはオーディオ出力により騒音がマスキ
ングされ騒音制御をする効果がないためである。オーデ
ィオ出力レベルがａ以上でｂ未満では騒音レベルがＡ以
上であれば騒音が気になるのでスイッチ部８をＯＮに騒
音制御部７を動作状態にする。またオーディオ出力レベ
ルがｂ以上でｃ以下なら騒音レベルがいずれの範囲にあ
ってもスイッチ部８をＯＦＦに騒音制御部７を非動作状
態にする。この場合には騒音が完全にオーディオ出力に
マスキングされるためである。なお、スイッチ部８がＯ
Ｎ時には検出回路１０はスイッチ部９により騒音制御部
７からの騒音制御信号を騒音として入力しスイッチ部８
がＯＦＦ時には増幅器６からの騒音信号を入力する。後
者の場合には騒音制御部７が動作していないので騒音信
号自体がマイクロフォン５に入力しているからである。
スイッチ部９はスイッチ部８に対応してＯＮ、ＯＦＦ動
作制御される。かくして本実施例によれば、パワーアン
プ２をオーディオと車室内騒音制御装置とで併用する場
合、効率良くパワーアンプ２を動作でき、車室内騒音の
聴感上の影響を低減でき、所期の目的を達成できる。以
上は騒音信号を検出するマイクロフォンが単一の場合を
説明したが、騒音制御部７では複数のマイクロフォンを
車室内に配置して騒音を制御することがある。以下にこ
の場合の検出回路１０の変形を説明する。FIG. 3 is a diagram for explaining ON / OFF control of the switch section 8 by the matrix 17 of FIG. As shown in the figure, the comparator 15 has a reference voltage for audio output signal a, b,
For example, the comparator 16 is set to A, B, and C with the reference voltage for the noise signal toward the higher side. In the matrix 17, when the audio output level is less than a, the noise control section 7 is activated by turning on the switch section 8 regardless of the range of the noise signal level. This is because noise is a concern. Further, if the audio output level is a or more and less than b and the noise level is less than A, the switch section 8 is turned off and the noise control section 7 is deactivated. This is because the noise is masked by the audio output and there is no effect of controlling the noise. When the audio output level is equal to or higher than a and lower than b, and the noise level is equal to or higher than A, noise is annoying, so the switch section 8 is turned on and the noise control section 7 is brought into an operating state. Further, if the audio output level is equal to or higher than b and equal to or lower than c, the switch section 8 is turned off and the noise control section 7 is deactivated regardless of the range of the noise level. This is because the noise is completely masked in the audio output in this case. The switch unit 8 is
At the time of N, the detection circuit 10 inputs the noise control signal from the noise control unit 7 as noise by the switch unit 9 and inputs it to the switch unit 8.
When is OFF, the noise signal from the amplifier 6 is input. This is because in the latter case, the noise control unit 7 is not operating and the noise signal itself is input to the microphone 5.
The switch unit 9 is controlled to be turned on and off corresponding to the switch unit 8. Thus, according to the present embodiment, when the power amplifier 2 is used in combination with the audio and the vehicle interior noise control device, the power amplifier 2 can be operated efficiently, and the audible effect of the vehicle interior noise can be reduced. Can be achieved. Although the case where the number of microphones that detect a noise signal is single has been described above, the noise control unit 7 may arrange a plurality of microphones in the vehicle compartment to control noise. A modification of the detection circuit 10 in this case will be described below.
【００１１】図４は図２の検出回路１０の第２の例を示
す図である。本図において、図２の構成と異なるのはミ
キサ１８である。該ミキサ１８は複数のマイクロフォン
５、増幅器６を介して、一例として騒音信号１、２、
３、４が入力し、これらを加算して整流器１２に出力す
る。検出回路１０がスイッチ部９により増幅器６の入力
を選択している場合い、車室内の平均的なレベルの騒音
がオーディオ出力にマスキングされるかが判断される。
このようにして、車室内が狭い空間であり音のレベルが
湾曲し易いのでこの影響を受けないようにできる。FIG. 4 is a diagram showing a second example of the detection circuit 10 of FIG. In this figure, the mixer 18 differs from the configuration of FIG. The mixer 18 is provided with a plurality of microphones 5 and an amplifier 6, and as an example, noise signals 1, 2,
3 and 4 are input, and these are added and output to the rectifier 12. When the detection circuit 10 selects the input of the amplifier 6 by the switch unit 9, it is determined whether or not the average level noise in the vehicle compartment is masked by the audio output.
In this way, since the interior of the vehicle is a narrow space and the sound level is easily curved, it is possible to prevent this from being affected.
【００１２】図５は図２の検出回路１０の第３の例を示
す図である。本図において、図２の構成と異なるのは低
域通過フィルタ１９である。この低域通過フィルタ１９
は整流器１１の入力段に設けられて、オーディオ音源１
からの高周波成分をカットする。この低域通過フィルタ
１９を設ける理由を以下に説明する。車室内の騒音の低
減させる騒音制御部７はＤＳＰ（Digital Signal Proce
ssor) を用いるアクティブ制御が行われ、処理量が多い
ためサンプリング周波数を数ＫＨｚに設定している。こ
れに対してオーディオ出力信号は可聴周波数（２０ＫＨ
ｚまで）を対象にするのでその範囲が広い。車室内での
騒音のマスキングを発生させるオーディオ出力は低周波
であることが分かっている。したがって、低域通過フィ
ルタ１９によりオーディオ音源１からの高周波成分をカ
ットして騒音のマスキングを検出する。検出回路１０は
ＤＳＰで構成されるので、オーディオ出力が高周波成分
を含むと処理規模が大きくなるが、オーディオ出力を低
周波に制限することにより、検出回路１０のＤＳＰ規模
が著しく小さくできる。このため、検出回路１０は騒音
制御部７のＤＳＰに構成でき一連の制御が実現容易にな
る。FIG. 5 is a diagram showing a third example of the detection circuit 10 of FIG. In this figure, the low-pass filter 19 differs from the configuration of FIG. This low pass filter 19
Is provided at the input stage of the rectifier 11, and the audio source 1
The high frequency component from is cut. The reason for providing the low pass filter 19 will be described below. The noise control unit 7 for reducing the noise in the passenger compartment is a DSP (Digital Signal Proce
Sampling frequency is set to several KHz because active control using ssor) is performed and the processing amount is large. On the other hand, the audio output signal has an audible frequency (20 KH
The range is wide because it targets (up to z). It has been found that the audio output that causes noise masking in the passenger compartment is low frequency. Therefore, the low-pass filter 19 cuts high-frequency components from the audio source 1 to detect noise masking. Since the detection circuit 10 is composed of a DSP, the processing scale becomes large when the audio output includes a high frequency component, but the DSP scale of the detection circuit 10 can be significantly reduced by limiting the audio output to a low frequency. Therefore, the detection circuit 10 can be configured as the DSP of the noise control unit 7, and a series of controls can be easily realized.
【００１３】[0013]
【発明の効果】以上説明したように本発明によれば、オ
ーディオ出力信号及び騒音信号のレベルをそれぞれ検出
して、オーディオ出力信号レベルに応じて騒音のマスキ
ングの程度を判断して前記騒音制御部をオン／オフ制御
するようにしたので、オーディオ再生音量を考慮して、
聴感上、車室内の騒音を低減することができ、併用する
パワーアンプの効率良く動作させることができるように
なる。さらに、複数の前記残留音を平均化して前記誤差
信号のレベルを形成するので車室内の狭い空間での音の
湾曲を考慮できるようになる。また、オーディオ出力信
号を低域周波数領域に制限するので、処理量を低減でき
このためＤＳＰ規模の低減できる。As described above, according to the present invention, the levels of the audio output signal and the noise signal are respectively detected, and the degree of noise masking is determined according to the audio output signal level to determine the noise control section. Since it was controlled to turn on / off, considering the audio playback volume,
It is possible to reduce the noise in the vehicle compartment from the viewpoint of hearing, and the power amplifier used together can be operated efficiently. Furthermore, since a plurality of the residual sounds are averaged to form the level of the error signal, it becomes possible to consider the curvature of the sound in the narrow space in the vehicle interior. In addition, since the audio output signal is limited to the low frequency range, the processing amount can be reduced and therefore the DSP scale can be reduced.
【図１】本発明の実施例に係る騒音制御装置を使用する
オーディオの全体構成例を示す図である。FIG. 1 is a diagram showing an overall configuration example of an audio using a noise control device according to an embodiment of the present invention.
【図２】図１の検出回路１０の第１の例を示す図であ
る。FIG. 2 is a diagram showing a first example of a detection circuit 10 in FIG.
【図３】図２のマトリックス１７によるスイッチ部８の
ＯＮ／ＯＦＦ制御を説明する図である。FIG. 3 is a diagram illustrating ON / OFF control of a switch unit 8 by a matrix 17 of FIG.
【図４】図２の検出回路１０の第２の例を示す図であ
る。FIG. 4 is a diagram showing a second example of the detection circuit 10 in FIG.
【図５】図２の検出回路１０の第３の例を示す図であ
る。5 is a diagram showing a third example of the detection circuit 10 of FIG.
【図６】従来の騒音制御装置を示す図である。FIG. 6 is a diagram showing a conventional noise control device.
１…オーディオ音源 ２…パワーアンプ ３…スピーカ ４…ミキサ ５…マイクロフォン ６…増幅器 ７…騒音制御部 ８、９…スイッチ部 １０…検出回路 １１、１２…整流器 １３、１４…積分器 １５、１６…コンパレータ １７…マトリックス １８…ミキサ １９…低域通過フィルタ １００…オーディオ ２００、２０１…騒音制御装置 DESCRIPTION OF SYMBOLS 1 ... Audio sound source 2 ... Power amplifier 3 ... Speaker 4 ... Mixer 5 ... Microphone 6 ... Amplifier 7 ... Noise control part 8, 9 ... Switch part 10 ... Detection circuit 11, 12 ... Rectifier 13, 14 ... Integrator 15, 16 ... Comparator 17 ... Matrix 18 ... Mixer 19 ... Low-pass filter 100 ... Audio 200, 201 ... Noise control device
Claims (3)
出力信号と、騒音との誤差信号を入力する騒音制御部
（７）により形成される騒音制御信号とを合成して、こ
の合成信号をパワーアンプ（２）で電力増幅する騒音制
御装置であって、 前記騒音制御部（７）の出力をオン／オフする第１のス
イッチ部（８）と、 前記騒音制御部（７）の入力及び出力信号を切り換える
第２のスイッチ部（９）と、 前記オーディオ音源（１）及び第２のスイッチ（９）の
出力をそれぞれ入力し前記オーディオ出力信号レベル及
び騒音制御部（７）の制御信号レベル若しくは騒音制御
部（７）が動作していない場合には騒音信号レベルをそ
れぞれ検出し、オーディオ出力信号レベルに応じて騒音
のマスキングの程度を判断し第１及び第２のスイッチ部
（８、９）を制御しパワーアンプ（２）の出力を制御す
るための検出回路（１０）とを備えることを特徴とする
騒音制御装置。1. An audio output signal from an audio sound source (1) and a noise control signal formed by a noise control section (7) for inputting an error signal with noise are synthesized, and the synthesized signal is used as a power amplifier. A noise control device for power amplification in (2), comprising: a first switch section (8) for turning on / off the output of the noise control section (7); and input and output signals of the noise control section (7). A second switch section (9) for switching between the audio output signal level and the noise control section (7) by inputting the outputs of the audio source (1) and the second switch (9) respectively. When the control unit (7) is not operating, the noise signal level is detected, and the degree of noise masking is determined according to the audio output signal level to determine the first and second switch units (8, 9). 2) and a detection circuit (10) for controlling the output of the power amplifier (2).
場合には、複数の前記騒音信号を入力するようにしてこ
れらの信号レベルを平均化して騒音信号のレベルを形成
することを特徴とする、請求項１に記載の騒音制御装
置。2. When the noise control section (7) is not operating, a plurality of the noise signals are input and the signal levels thereof are averaged to form a noise signal level. The noise control device according to claim 1.
回路（１０）でこれを低域周波数領域に制限することを
特徴とする、請求項１に記載の騒音制御装置。3. The noise control device according to claim 1, wherein a detection circuit (10) to which the audio output signal is input limits the audio output signal to a low frequency region.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5106902A JPH06318085A (en) | 1993-05-07 | 1993-05-07 | Noise controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5106902A JPH06318085A (en) | 1993-05-07 | 1993-05-07 | Noise controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06318085A true JPH06318085A (en) | 1994-11-15 |
Family
ID=14445393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5106902A Withdrawn JPH06318085A (en) | 1993-05-07 | 1993-05-07 | Noise controller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06318085A (en) |
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| JP2007243739A (en) * | 2006-03-10 | 2007-09-20 | Sharp Corp | Noise-canceling headphone and method for changing over control for noise cancellation |
| JP2007259246A (en) * | 2006-03-24 | 2007-10-04 | Sharp Corp | Noise canceling headphone, and method of switching noise canceling control mode |
| JP2007259241A (en) * | 2006-03-24 | 2007-10-04 | Sharp Corp | Noise canceling headphone, and method of switching noise canceling control mode |
| JP2008005269A (en) * | 2006-06-23 | 2008-01-10 | Audio Technica Corp | Noise-canceling headphone |
| JP2008221962A (en) * | 2007-03-12 | 2008-09-25 | Honda Motor Co Ltd | On-vehicle active sound controller |
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1993
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| JP2007259241A (en) * | 2006-03-24 | 2007-10-04 | Sharp Corp | Noise canceling headphone, and method of switching noise canceling control mode |
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| JP2009532926A (en) * | 2006-04-01 | 2009-09-10 | ウォルフソン・マイクロエレクトロニクス・ピーエルシー | Ambient noise reduction control system |
| JP2008005269A (en) * | 2006-06-23 | 2008-01-10 | Audio Technica Corp | Noise-canceling headphone |
| JP2008221962A (en) * | 2007-03-12 | 2008-09-25 | Honda Motor Co Ltd | On-vehicle active sound controller |
| JP2009094920A (en) * | 2007-10-11 | 2009-04-30 | Alpine Electronics Inc | Speaker common-use system |
| JP2010019876A (en) * | 2008-07-08 | 2010-01-28 | Nec Electronics Corp | Noise cancel device and method |
| US9020158B2 (en) | 2008-11-20 | 2015-04-28 | Harman International Industries, Incorporated | Quiet zone control system |
| JP2010244045A (en) * | 2009-04-09 | 2010-10-28 | Harman Internatl Industries Inc | System for active noise control based on audio system output |
| JP2012181541A (en) * | 2009-04-09 | 2012-09-20 | Harman Internatl Industries Inc | System for active noise control based on audio system output |
| EP2239728A2 (en) * | 2009-04-09 | 2010-10-13 | Harman International Industries, Incorporated | System for active noise control based on audio system output |
| JP2013528830A (en) * | 2010-06-04 | 2013-07-11 | アップル インコーポレイテッド | Active noise cancellation in portable audio devices. |
| KR101503991B1 (en) * | 2010-06-04 | 2015-03-18 | 애플 인크. | Portable audio device and method for performing a call using a portable audio communications device |
| US9099077B2 (en) | 2010-06-04 | 2015-08-04 | Apple Inc. | Active noise cancellation decisions using a degraded reference |
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| CN113110241B (en) * | 2021-05-13 | 2022-11-22 | 中科可控信息产业有限公司 | Electronic equipment and audio control method thereof |
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