JPH0396199A - Noise reduction headphone - Google Patents
Noise reduction headphoneInfo
- Publication number
- JPH0396199A JPH0396199A JP1234186A JP23418689A JPH0396199A JP H0396199 A JPH0396199 A JP H0396199A JP 1234186 A JP1234186 A JP 1234186A JP 23418689 A JP23418689 A JP 23418689A JP H0396199 A JPH0396199 A JP H0396199A
- Authority
- JP
- Japan
- Prior art keywords
- external noise
- headphones
- microphone
- ear
- noise
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 210000000613 ear canal Anatomy 0.000 claims description 10
- 230000003044 adaptive effect Effects 0.000 abstract description 23
- 230000006866 deterioration Effects 0.000 abstract 1
- 230000006870 function Effects 0.000 description 25
- 238000009413 insulation Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 9
- 210000005069 ears Anatomy 0.000 description 4
- 210000003128 head Anatomy 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1083—Reduction of ambient noise
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1016—Earpieces of the intra-aural type
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、外部騒音が激しい場所で使用して好適な騒
音低減ヘッドホンに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to noise reduction headphones suitable for use in places where external noise is intense.
この発明は、外部騒音が激しい場所で使用して好適な騒
音低減ヘッドホンにおいて、装着時においてヘッドホン
と耳道との間に位置する第２のマイクロホンの出力を用
いて、装着時において耳の近傍゛に設けられ外部騒音を
収音する第１のマイクロホンからヘッドホンまでの伝達
特性を、外部騒音が耳道に到達するまでの伝達特性に同
定することにより、ヘッドホンの装着の仕方に係わらず
、外部騒音を低減できるようにしたものである。The present invention provides noise-reducing headphones suitable for use in places with intense external noise. By identifying the transmission characteristics from the first microphone installed in the earphones that collects external noise to the headphones as the transmission characteristics until the external noise reaches the ear canal, external noise can be detected regardless of how the headphones are worn. It is designed to reduce the
外部騒音の激しい場所で携帯用ヘッドホンプレーヤ等か
らの再生信号をヘッドホンで聴取する場合、外部騒音が
激しいと再生信号が聞き取り難いため、従来、ユーザー
は、ボリュームを必要以上に上げて聴取を行っている。When listening to the playback signal from a portable headphone player, etc. using headphones in a place with strong external noise, users have traditionally turned up the volume higher than necessary to listen, since it is difficult to hear the playback signal if the external noise is strong. There is.
しかしながら、携帯用ヘッドホンのボリュームを必要以
上に上げて聴取を行っていては、周囲にこの再生音が漏
れて迷惑になったり、また、聴覚に支障をきたしたりす
る。However, if you listen with the volume of your portable headphones set higher than necessary, the reproduced sound will leak to those around you and become a nuisance, and may even impair your hearing.
また、ヘリコプタや飛行機の操縦士が管制塔と交信を行
う場合、コックピット内は激しい騒音にさらされている
ため、交信内容が聞き取り難い場合がある．このため、
ヘリコプタや飛行機の操縦士は、所謂耳当て型のヘッド
ホンを用いて交信を行っている．耳当て型のヘッドホン
は、ヘッドホンカップを側頭部に押し付け、側頭部とヘ
ッドホンカップとの間隙から外部騒音が入ってこないよ
うにしたものである．ところが、耳当て型のヘッドホン
は、ヘッドホンカップを側頭部に強く押し当てて使用さ
れるため、長時間装着すると、頭部に圧迫間が生じる．
また、耳当て型のヘッドホンは、ヘッドホン自体も大き
く、且つ、重いものである．このため、長時間の使用に
は耐え難いものである．
そこで、本願発明者は、耳の近傍に外部からの騒音を収
音するマイクロホンを配置し、このマイクロホンの出力
を騒音威分が耳道に到達するまでの周波数特性と同じ周
波数特性で且つ位相を反転させるような特性の制御回路
によりイコライズし、これに適当なゲインをもったアン
プを介してヘッドホンに供給することにより、外部から
の騒音成分を打ち消すようにした騒音低減ヘッドホンを
提案している。Furthermore, when a helicopter or airplane pilot communicates with a control tower, the content of the communication may be difficult to hear because the cockpit is exposed to intense noise. For this reason,
Helicopter and airplane pilots communicate using so-called over-the-ear headphones. Over-the-ear headphones have a headphone cup pressed against the temporal region of the head to prevent external noise from entering through the gap between the temporal region and the headphone cup. However, when using over-the-ear headphones, the headphone cup is pressed firmly against the side of the head, so if worn for a long time, pressure may develop on the head.
Furthermore, the headphones themselves are large and heavy. Therefore, it is difficult to withstand long-term use. Therefore, the inventor placed a microphone near the ear to pick up external noise, and set the output of this microphone to have the same frequency characteristic and phase as the frequency characteristic of the noise until it reaches the auditory canal. We are proposing noise-reducing headphones that cancel out external noise components by equalizing them using a control circuit with inverting characteristics and supplying this to the headphones via an amplifier with an appropriate gain.
第４図は、このような従来の騒音低減ヘッドホンの一例
を示すものである。FIG. 4 shows an example of such conventional noise reduction headphones.
第４図において、ヘッドホン５１の外筐にマイクロホン
５２が取り付けられる。マイクロホン５２は、ヘッドホ
ン５１の外筐に取り付けられているので、ヘッドホン５
２を耳５３に装着すると、マイクロホン５２では耳５３
の近傍に達する外部騒音Ｎ１が収音される。In FIG. 4, a microphone 52 is attached to the outer casing of a headphone 51. Since the microphone 52 is attached to the outer casing of the headphones 51,
2 to the ear 53, the microphone 52
External noise N1 reaching the vicinity of is collected.
マイクロホン５２の出力が制御回路５４に供給される。The output of microphone 52 is supplied to control circuit 54 .
制御回路５４は、外部騒音Ｎ，が耳道５３Ａに到達する
までの音響的な周波数特性に対応し、且つ、外部騒音の
位相を反転させた周波数特性及び位相特性を実現するた
めのものである。制御回！５４からの出力信号は、所定
ゲインを有するアンプ５５により増幅され、ヘッドホン
５１に供給される．
二のような構成とすると、外部騒音が打ち消される。こ
のことを、ｍ５図のブロック線図を参照して説明する．
第５図は、第４図に示す構戒を周波数領域の伝達関数を
用いたブロック線図で示したものである。The control circuit 54 corresponds to the acoustic frequency characteristics of the external noise N until it reaches the auditory canal 53A, and is for realizing frequency characteristics and phase characteristics in which the phase of the external noise is inverted. . Control times! The output signal from 54 is amplified by an amplifier 55 having a predetermined gain and supplied to headphones 51. With configuration 2, external noise is canceled out. This will be explained with reference to the block diagram of diagram m5. FIG. 5 is a block diagram showing the structure shown in FIG. 4 using a frequency domain transfer function.
第５図において、ヘッドホン５１の伝達関数をＨ，ｌと
し、マイクロホン５２の伝達関数をＭｓ！とし、制御回
路５４の伝達関数をγ，４とし、アンプ５５の伝達関数
をＡＳＳとする．人力端子６１が外部騒音Ｎ１の入力端
子に対応し、出力端子６２が耳道５３Ａに出力する音響
出力端子に対応する．入力端子６１からの外部騒音Ｎ，
は、耳道５３Ａに到達するとともに、マイクロホン５２
で収音される．マイクロホン５２で収音された騒音Ｎｌ
は、制御回路５４、アンブ５５を介してヘッドホン５１
に供給されるので、ヘッドホン５ｌの出力の音圧ＰＳＩ
は、
ＰｓＩ＝ＮＩ ″ＭＢγｓｇＡｓｓＨｓ＋となる．そし
て、耳道５３Ａで、ヘッドホン５１の出力と耳道５３Ａ
に到達する外部騒音Ｎ１とが音響的に加算される。耳道
５３Ａに到達する外部騒音の遮音特性５９の伝達関数を
ＦＳ９とする。ヘッドホン５１の出力と耳道５３Ａに到
達する外部騒音Ｎｌとが音響的に加算されることが、第
５図において加算点６３で示されている。したがって、
音響出力端子６２の音圧ＰＳ！は、
Ｐｓｚ＝Ｎ＋ −ＭｓｔＴｓａＡｓｓＨｓｌ＋Ｎ＋
・ＦＳ９＝Ｎ＋ （ＭｓｔｒｓｎＡｓｓＨｓ＋＋Ｆ
ｓ＊）となる。In FIG. 5, the transfer function of the headphones 51 is H, l, and the transfer function of the microphone 52 is Ms! Let the transfer function of the control circuit 54 be γ,4, and the transfer function of the amplifier 55 be ASS. The human power terminal 61 corresponds to the input terminal for external noise N1, and the output terminal 62 corresponds to the sound output terminal for outputting to the ear canal 53A. External noise N from input terminal 61,
reaches the ear canal 53A, and the microphone 52
The sound is recorded in Noise Nl picked up by the microphone 52
is connected to the headphones 51 via the control circuit 54 and amplifier 55.
Since the sound pressure PSI of the output of the headphones 5L is
becomes PsI=NI″MBγsgAssHs+. Then, at the ear canal 53A, the output of the headphones 51 and the ear canal 53A
The external noise N1 that reaches 1 is acoustically added to the external noise N1. The transfer function of the sound insulation characteristic 59 of external noise reaching the auditory canal 53A is assumed to be FS9. The addition point 63 in FIG. 5 indicates that the output of the headphones 51 and the external noise Nl reaching the ear canal 53A are acoustically added. therefore,
Sound pressure PS of sound output terminal 62! is, Psz=N+ −MstTsaAssHsl+N+
・FS9=N+ (MstrsnAssHs++F
s*).
ここで、外部騒音が聞こえないようにするには、上式に
おいて音響出力端子６２からの出力ＰＳｔを０にすれば
良い。すなわち、制御回路５４の伝達関数γ，，を、
ＭＳｚγｓａＡｓｓＨｓ＋ ＋ Ｆ Ｓ９＝ ０７Ｓ４
＝ Ｆｓｗ／ＭｓｚＡｓｓＨｓ＋という特性にすれば
良い。Here, in order to prevent external noise from being heard, the output PSt from the acoustic output terminal 62 in the above equation should be set to 0. That is, the transfer function γ,, of the control circuit 54 is MSzγsaAssHs+ + F S9=07S4
= Fsw/MszAssHs+.
このような構戒とすることにより、外部騒音を打ち消す
ことが原理的に可能である。ヘッドホン５ｌとしては、
密閉型のヘッドホンでも、オープンエア型のヘッドホン
でも、インナー型のヘッドホンでも良い。By adopting such a precept, it is theoretically possible to cancel out external noise. As a 5L headphone,
It can be closed-back headphones, open-air headphones, or inner-type headphones.
ところが、第４図に示す従来の騒音低減ヘッドホンでは
、制御回路５４の伝達関数Ｔｓ＜が固定されている。こ
のため、ヘッドホン５ｌをかけ直したり、他の人が使用
した場合に、満足できる騒音低減特性が得られないこと
があるという問題がある。However, in the conventional noise reduction headphones shown in FIG. 4, the transfer function Ts< of the control circuit 54 is fixed. For this reason, there is a problem in that when the headphones 5l are put back on or when another person uses them, satisfactory noise reduction characteristics may not be obtained.
つまり、ヘッドホン５ｌの伝達関数ＨＳＩは、ヘッドホ
ン５１の装着の仕方や耳５３の形状により変わってくる
．ヘッドホン５１の伝達関数１｛ｓ＋が変われば、外部
騒音を間こえなくするための制御回路５４の伝達関数ｒ
ｓａが変わってくる。特に、ヘッドホン５ｌとしてオー
プンエア型のヘッドホンやインナー型のヘッドホンを用
いる場合には、ヘッドホン５１の装着の仕方や耳５３の
形状による伝達関数Ｈ，の変化が大きい。したがって、
十分な騒音低減特性を得るためには、ヘッドホン５１の
装着の仕方や耳５３の形状に応じて、制御回路５４の伝
達関数７ｓａを可変させる必要がある。In other words, the transfer function HSI of the headphones 5l changes depending on how the headphones 51 are worn and the shape of the ears 53. If the transfer function 1{s+ of the headphones 51 changes, the transfer function r of the control circuit 54 for suppressing external noise
sa will change. In particular, when open-air type headphones or inner type headphones are used as the headphones 5l, the transfer function H changes greatly depending on the way the headphones 51 are worn and the shape of the ears 53. therefore,
In order to obtain sufficient noise reduction characteristics, it is necessary to vary the transfer function 7sa of the control circuit 54 depending on how the headphones 51 are worn and the shape of the ears 53.
したがって、この発明の目的は、ヘッドホンの装着の仕
方等によりヘッドホンの伝達特性が変化しても、十分な
騒音低減特性が得られる騒音低減ヘッドホンを提供する
ことにある。Therefore, an object of the present invention is to provide noise reduction headphones that can provide sufficient noise reduction characteristics even if the transmission characteristics of the headphones change due to the way the headphones are worn.
この発明は、装着時において耳の近傍に設けられ、外部
騒音を収合する第１の音響一電気変換手段２と、装着時
において耳の近傍に設けられ、耳道に音を出力する電気
一音響変換手段１と、装着時において電気一音響変換手
段ｌと耳道との間に位置する第２の音響一電気変換手段
３と、第ｌの音響一電気変換手段２から電気一音響変換
手段ｌまでの伝達特性を、外部騒音が耳道に到達するま
での伝達特性に同定する千段５とを備えてなる騒音低減
ヘッドホンである。This invention comprises a first acoustic-to-electric conversion means 2 that is provided near the ear when worn and collects external noise, and an electric transducer 2 that is provided near the ear when worn and outputs sound to the auditory canal. an acoustic-to-acoustic converter 1; a second acoustic-to-electrical converter 3 located between the electric-to-acoustic converter 1 and the auditory canal when worn; and an electric-to-acoustic converter from the first acoustic-to-electrical converter 2 This noise reduction headphone is equipped with a 1,000-step 5 step that identifies the transmission characteristic up to l to the transmission characteristic until the external noise reaches the auditory canal.
（作用）
適応処理システム５によりマイクロホン２からヘッドホ
ン１までの伝達系が外部騒音Ｎが耳道４Ａに入射する時
の遮音特性と同様にな特性となるように同定される．こ
のため、耳道４Ａ内の騒音或分を打ち消すことができる
。このように、適応処理システム５は、常に、外部騒音
Ｎが耳道４Ａに入射する時の遮音特性と同様な特性とな
るように同定されるので、ヘッドホン１の装着の仕方が
変わっても、遮音特性が悪化しない．
〔実施例〕
以下、この発明の一実施例について図面を参照して説明
する。(Operation) The adaptive processing system 5 identifies the transmission system from the microphone 2 to the headphones 1 so that it has characteristics similar to the sound insulation characteristics when the external noise N enters the auditory canal 4A. Therefore, the noise within the auditory canal 4A can be canceled out to some extent. In this way, the adaptive processing system 5 is always identified so that the sound insulation characteristics are the same as those when the external noise N enters the auditory canal 4A, so even if the way the headphones 1 are worn changes, Sound insulation properties do not deteriorate. [Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
第１図はこの発明の一実施例を示すものである．第１図
において、ヘッドホン１の外筐にマイクロホン２が取り
付けられる。これとともに、ヘッドホン１の内側にはマ
イクロホン３が取り付けられる。ヘッドホンｌが耳３に
装着された状態では、マイクロホン２では外部騒音Ｎが
収音され、マイクロホン３では耳道４Ａ内の音が収音さ
れる。Figure 1 shows an embodiment of this invention. In FIG. 1, a microphone 2 is attached to the outer casing of a headphone 1. Along with this, a microphone 3 is attached to the inside of the headphones 1. When the headphones 1 are worn on the ears 3, the microphone 2 picks up external noise N, and the microphone 3 picks up sounds inside the auditory canal 4A.
マイクロホン２の出力が適応処理システム５に供給され
る。適応処理システム５により、マイクロホン２からヘ
ッドホン１までの伝達特性が外部騒音Ｎが耳道４Ａに到
達するまでの伝達特性と同様な特性となるように同定さ
れる。適応処理システム５の出力がアンプ６を介してヘ
ッドホンｌに供給される。ヘッドホン１により、アンプ
６の出力信号が音に変換され、この音が耳道４Ａに供給
される。耳道４Ａ内には、外部から騒音Ｎが入ってくる
が、適応処理システム５の働きにより、この騒音成分が
最小になるように制御される。The output of the microphone 2 is fed to an adaptive processing system 5. The adaptive processing system 5 identifies the transmission characteristic from the microphone 2 to the headphone 1 to be similar to the transmission characteristic until the external noise N reaches the auditory canal 4A. The output of the adaptive processing system 5 is supplied via an amplifier 6 to headphones l. The headphones 1 convert the output signal of the amplifier 6 into sound, and this sound is supplied to the auditory canal 4A. Noise N enters the auditory canal 4A from the outside, but the adaptive processing system 5 controls this noise component to a minimum.
すなわち、この発明の一実施例は、第２図に示すような
閉ループ適応システムを実現して、騒音威分を除去する
ものである。第２図において、適応システム１１は、シ
ステム１２の特性と同様に動作するように試みる。すな
わち、信号Ｓが適応システム１１とシステム１２に供給
される。減算器１３で、適応システム１１の出力ｙとシ
ステム１２の出力ｄとの誤差ε（ε一ｄ−ｙ）が求めら
れる。適応システム１１は、この誤差分εが最小となる
ように収束される。適応が完了した後には、システムｌ
２の伝達関数が適応システム１１の伝達関数と等しいと
いう意味で、システムは同定される。That is, one embodiment of the present invention implements a closed-loop adaptive system as shown in FIG. 2 to eliminate noise influence. In FIG. 2, adaptive system 11 attempts to behave similarly to the characteristics of system 12. That is, the signal S is provided to the adaptation system 11 and the system 12. A subtracter 13 calculates the error ε (ε−d−y) between the output y of the adaptive system 11 and the output d of the system 12. The adaptive system 11 is converged so that this error ε is minimized. After the adaptation is complete, the system
The system is identified in the sense that the transfer function of 2 is equal to the transfer function of the adaptive system 11.
この実施例は、第２図に示すような系において、信号Ｓ
を外部騒音Ｎとし、誤差分εを耳道４Ａでの音圧とし、
システムｌ２を外部騒音Ｎが耳道４Ａに到達する間の伝
達特性とし、適応システム１１をマイクロホン２からヘ
ッドホン１までの伝達系としたものである。誤差分とに
対応する耳道４Ａの音圧は、マイクロホン３で検出され
、このマイクロホン３の出力に基づいて適応処理システ
ム５が制御される。これにより、耳道４Ａでの騒音或分
の音圧が最小となる。In this embodiment, in a system as shown in FIG.
is the external noise N, the error ε is the sound pressure at the auditory canal 4A,
The system 12 has a transmission characteristic while the external noise N reaches the auditory canal 4A, and the adaptive system 11 has a transmission system from the microphone 2 to the headphones 1. The sound pressure in the auditory canal 4A corresponding to the error is detected by the microphone 3, and the adaptive processing system 5 is controlled based on the output of the microphone 3. This minimizes a certain amount of sound pressure in the ear canal 4A.
第３図は、第１図に示す構或を周波数領域の伝達関数を
用いたブロック線図で示したものである。FIG. 3 is a block diagram showing the structure shown in FIG. 1 using a frequency domain transfer function.
第３図において、入力端子２１が外部騒音Ｎの入力端子
に対応し、出力端子２２が耳道４Ａに伝わる音響出力端
子に対応する。In FIG. 3, input terminal 21 corresponds to the input terminal for external noise N, and output terminal 22 corresponds to the sound output terminal transmitted to ear canal 4A.
入力端子２１から外部騒音Ｎが入ってくる。こ外部騒音
Ｎは、伝達関数がＭ２のマイクロホン２で収音されると
ともに、伝達関数がＦ２。の遮音特性２０を介して耳道
４Ａに到達する。マイクロホン２で収音された騒音Ｎは
、適応処理システム５を構或する制御回路５Ａを介して
伝達関数がＡ，のアンブ６に供給される。制御回路５Ａ
の伝達関数は、一γ，とされる。アンブ６の出力が伝達
関数がＨＩのヘッドホンｌに供給される。ヘッドホンｌ
の出力が耳道４Ａに供給され、耳道４Ａで、遮音特性２
０を介された外部騒音と音響的に加算される。この音響
的な加算が加算点２３で示される。External noise N enters from the input terminal 21. This external noise N is collected by the microphone 2 whose transfer function is M2, and whose transfer function is F2. It reaches the auditory canal 4A via the sound insulation properties 20 of. The noise N picked up by the microphone 2 is supplied to the amplifier 6 whose transfer function is A via a control circuit 5A that constitutes the adaptive processing system 5. Control circuit 5A
The transfer function of is assumed to be -γ. The output of the amplifier 6 is supplied to the headphones l whose transfer function is HI. headphones l
is supplied to the auditory canal 4A, and the sound insulation characteristic 2
It is acoustically added to the external noise filtered through 0. This acoustic addition is indicated by addition point 23.
耳道４Ａ内の音が伝達関数がＭ，のマイクロホン３で収
音される。このマイクロホン３の出力が適応処理システ
ム５を構戒する適応処理プロセッサ５Ｂに供給される。Sound within the auditory canal 4A is collected by the microphone 3 with a transfer function of M. The output of this microphone 3 is supplied to an adaptive processing processor 5B that monitors the adaptive processing system 5.
適応処理プロセッサ５Ｂの出力により、制御回路５Ａの
伝達関数が制御される。これにより、遮音特性２０の伝
達関数Ｆ２。と、マイクロホン２、制御回路５Ａ，アン
ブ６、ヘッドホン１の間の伝達系の伝達関数（ Ｍ ｚ
γ，ＡｂＨ．）とが等しくなる。The output of the adaptive processor 5B controls the transfer function of the control circuit 5A. Thereby, the transfer function F2 of the sound insulation characteristic 20. and the transfer function of the transfer system between microphone 2, control circuit 5A, amplifier 6, and headphones 1 (M z
γ, AbH. ) are equal.
なお、アンプ６の出力と例えば携帯用ヘッドホンプレー
ヤの再生信号とを加算してヘッドホン１に供給するよう
にすれば、外部騒音を除去して、携帯用ヘッドホンプレ
ーヤの再生音だけを聞くことができる。Note that by adding the output of the amplifier 6 and, for example, a playback signal from a portable headphone player and supplying the resultant signal to the headphones 1, external noise can be removed and only the sound played by the portable headphone player can be heard. .
この発明によれば、適応処理システム５により、マイク
ロホン２からヘッドホン１までの伝達特性が外部騒音が
耳道４Ａに入射する時の遮音特性と同様にな特性となる
ように同定される。このため、耳道４Ａ内の騒音威分を
打ち消すことができる．このように、適応処理システム
５は、常に、騒音が耳道４Ａに入射する時の遮音特性と
同様な特性となるように同定されるので、ヘッドホン１
の装着の仕方が変わっても、遮音特性が悪化しない。According to the present invention, the adaptive processing system 5 identifies the transmission characteristic from the microphone 2 to the headphone 1 so as to have the same characteristic as the sound insulation characteristic when external noise enters the auditory canal 4A. Therefore, the noise force within the auditory canal 4A can be canceled out. In this way, the adaptive processing system 5 is always identified to have the same sound insulation characteristics as the noise when it enters the ear canal 4A, so the headphones 1
The sound insulation properties will not deteriorate even if the method of mounting changes.
第１図はこの発明の一実施例のブロック図．第２図は適
応システムの説明に用いるブロック線図．第３図はこの
発明の一実施例の説明に用いるブロック線図．第４図は
従来の騒音低減ヘッドホンの一例のブロック図．第５図
は従来の騒音低減ヘッドホンの一例の説明に用いるブロ
ック線図である．図面における主要な符号の説明
１：ヘッドホン．２．３：マイクロホン．５：適応シス
テム。Figure 1 is a block diagram of one embodiment of this invention. Figure 2 is a block diagram used to explain the adaptive system. FIG. 3 is a block diagram used to explain one embodiment of the present invention. Figure 4 is a block diagram of an example of conventional noise reduction headphones. FIG. 5 is a block diagram used to explain an example of conventional noise reduction headphones. Explanation of main symbols in the drawings 1: Headphones. 2.3: Microphone. 5: Adaptive system.
Claims (1)
する第１の音響−電気変換手段と、 装着時において耳の近傍に設けられ、耳道に音を出力す
る電気−音響変換手段と、 装着時において上記電気−音響変換手段と耳道との間に
位置する第２の音響−電気変換手段と、上記第１の音響
−電気変換手段から上記電気−音響変換手段までの伝達
特性を、外部騒音が耳道に到達するまでの伝達特性に同
定する手段 とを備えてなる騒音低減ヘッドホン。[Scope of Claims] A first acoustic-to-electric conversion means that is provided near the ear when worn and collects external noise; and an electric converter that is provided near the ear when worn and outputs sound to the ear canal. - an acoustic converting means; a second acoustic-electrical converting means located between the electro-acoustic converting means and the auditory canal when worn; and from the first acoustic-electric converting means to the electro-acoustic converting means. and means for identifying the transmission characteristic of external noise up to the time it reaches the auditory canal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1234186A JP2867461B2 (en) | 1989-09-08 | 1989-09-08 | Noise reduction headphones |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1234186A JP2867461B2 (en) | 1989-09-08 | 1989-09-08 | Noise reduction headphones |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0396199A true JPH0396199A (en) | 1991-04-22 |
| JP2867461B2 JP2867461B2 (en) | 1999-03-08 |
Family
ID=16967027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1234186A Expired - Fee Related JP2867461B2 (en) | 1989-09-08 | 1989-09-08 | Noise reduction headphones |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2867461B2 (en) |
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