JP2778173B2 - Noise reduction device - Google Patents
Noise reduction deviceInfo
- Publication number
- JP2778173B2 JP2778173B2 JP2008509A JP850990A JP2778173B2 JP 2778173 B2 JP2778173 B2 JP 2778173B2 JP 2008509 A JP2008509 A JP 2008509A JP 850990 A JP850990 A JP 850990A JP 2778173 B2 JP2778173 B2 JP 2778173B2
- Authority
- JP
- Japan
- Prior art keywords
- sound
- noise reduction
- reduction device
- tube
- internal microphone
- 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
-
- 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
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、例えば乗り物の中や工事現場等の高騒音下
で用いて好適な外部騒音を低減するための騒音低減装置
に関する。Description: TECHNICAL FIELD The present invention relates to a noise reduction device for reducing external noise suitable for use under high noise, for example, in a vehicle or a construction site.
本発明にかかる騒音低減装置は、外耳道と略同一の内
径に形成され、一端側が耳介装着部となされ、他端側が
音声の無反射端となされた音響管と、装着時においてそ
れぞれ耳の近傍に設けられるとともに、上記音響管の周
面に各振動面を管内方に臨ませて互いに近接して取り付
けられるイヤホンユニット及び内部マイクロホンユニッ
トとを有し、上記内部マイクロホンユニットで収音した
上記音響管内の外部騒音の位相を反転させ、上記イヤホ
ンユニットで発音することにより外部騒音を低減し、良
好な再生音を聴取できるようにしたものである。The noise reduction device according to the present invention has an acoustic tube having substantially the same inner diameter as the ear canal, one end of which serves as an auricle attachment portion, and the other end of which serves as a non-reflection end of sound. And an earphone unit and an internal microphone unit that are attached close to each other with the respective vibrating surfaces facing the inside of the tube on the peripheral surface of the acoustic tube, and the inside of the acoustic tube collected by the internal microphone unit. By inverting the phase of the external noise and generating the sound with the earphone unit, the external noise is reduced so that a good reproduced sound can be heard.
従来、外部騒音の激しい場所での作業等に使用される
騒音低減装置として、いわゆる耳あて型のものが広く知
られている。2. Description of the Related Art Conventionally, a so-called earrest type is widely known as a noise reduction device used for work in a place where external noise is severe.
この耳あて型の騒音低減装置は、外部からの騒音を低
減するためヘッドホンカップで耳を覆うようにして装着
し、該ヘッドホンカップを側頭部に押し当て、ヘッドホ
ンカップと側頭部との間から周囲からの外部騒音が入ら
ないようにして使用されていた。This earpiece type noise reduction device is mounted so as to cover the ears with a headphone cup in order to reduce external noise, and the headphone cup is pressed against the temporal region, so that the distance between the headphone cup and the temporal region is reduced. It was used to prevent outside noise from entering from around.
しかし、上述の従来の騒音低減装置は、ヘッドホンカ
ップと側頭部との間から周囲からの外部騒音が入らない
ようにするため、該ヘッドホンカップを側頭部に強く押
し当てる必要があるため、該側頭部に圧迫感を生じるう
え、騒音低減装置自体も大きくかつ重いものとなるため
長時間の使用には耐え難いものであった。However, the above-described conventional noise reduction device needs to strongly press the headphone cup against the temporal region in order to prevent external noise from surroundings from entering between the headphone cup and the temporal region, In addition to a sense of oppression on the temporal region, the noise reduction device itself is large and heavy, and thus cannot be used for a long time.
また、ヘッドホンカップだけでは、騒音の低減（数百
Hz〜1K Hz以下）を遮音することができないうえ、例え
ば上述の方法で騒音を低減し再生音を聴取しようとした
場合、該ヘッドホンカップ内での再生音の反射により、
いわゆる頭内定位現象が生じてしまい交信等に悪影響を
及ぼしていた。In addition, noise reduction (several hundreds)
Hz to 1K Hz or less) .In addition, for example, when trying to reduce the noise and listen to the reproduced sound by the above-described method, reflection of the reproduced sound in the headphone cup causes
A so-called intra-head localization phenomenon occurred, which had an adverse effect on communications.
なお、この頭内定位現象とは外耳道より音源側を見た
場合、この外耳道の入口部分において音響インピーダン
スが外耳道内のインピーダンスと異なっているために、
ヘッドホンカップと外耳道の入口部分との間で反射を生
じ、この反射波が鼓膜へ戻ってしまい、頭内に音像が定
位してしまうような現象であり、いわゆる耳がつまるよ
うな不快感を生ずるものである。In addition, when the sound source side is viewed from the external auditory canal with this in-head localization phenomenon, the acoustic impedance at the entrance of the external auditory canal is different from the impedance in the external auditory canal.
Reflection occurs between the headphone cup and the entrance of the ear canal, and this reflected wave returns to the eardrum, causing the sound image to be localized in the head, causing discomfort such as so-called clogging of the ear Things.
本発明は上述の課題に鑑みてなされたものであり、頭
内定位現象を生ずることなく、また、側頭部を圧迫する
ことなく長時間の使用に耐え、外部騒音を有効に低減で
きるような騒音低減装置の提供を目的とする。The present invention has been made in view of the above-described problems, and does not cause intraocular localization, and can withstand long-term use without compressing the temporal region, and can effectively reduce external noise. The purpose is to provide a noise reduction device.
本発明にかかる騒音低減装置は、外耳道と略同一の内
径に形成され、一端側が耳介装着部となされ、他端側が
音声の無反射端となされた音響管と、装着時においてそ
れぞれ耳の近傍に設けられるとともに、上記音響管の周
面に各振動面を管内方に臨ませて互いに近接して取り付
けられるイヤホンユニット及び内部マイクロホンユニッ
トとを有し、上記内部マイクロホンユニットで収音した
上記音響管内の外部騒音の位相を反転させ、上記イヤホ
ンユニットで発音することにより外部騒音を低減するこ
とを特徴として上述の課題を解決する。The noise reduction device according to the present invention has an acoustic tube having substantially the same inner diameter as the ear canal, one end of which serves as an auricle attachment portion, and the other end of which serves as a non-reflection end of sound. And an earphone unit and an internal microphone unit that are attached close to each other with the respective vibrating surfaces facing the inside of the tube on the peripheral surface of the acoustic tube, and the inside of the acoustic tube collected by the internal microphone unit. The above-mentioned problem is solved by inverting the phase of the external noise and generating the sound with the earphone unit to reduce the external noise.
本発明にかかる騒音低減装置は、外耳道と略同一の内
径に形成され、一端側が耳介装着部となされ、他端側が
音声の無反射端となされた音響管に、イヤホンユニット
及び内部マイクロホンユニットの各振動板を該音響管の
周面に管内方に臨ませて互いに近接して取り付け、該内
部マイクロホンユニットで収音した上記音響管内の外部
騒音の位相を反転させ上記イヤホンユニットで発音する
構成をとることにより、側頭部を圧迫することなく外部
騒音を有効に低減し、長時間使用しても圧迫感等の不快
感を生ずることがない。The noise reduction device according to the present invention has an earphone unit and an internal microphone unit formed in an acoustic tube having substantially the same inner diameter as the ear canal, one end of which serves as an auricle attachment portion, and the other end of which serves as a non-reflection end of sound. Each diaphragm is attached to the peripheral surface of the sound tube facing the inside of the sound tube so as to be close to each other, and the phase of external noise in the sound tube picked up by the internal microphone unit is inverted and the sound is generated by the earphone unit. This effectively reduces external noise without compressing the temporal region, and does not cause discomfort such as oppression even when used for a long time.
以下、本発明にかかる騒音低減装置の実施例について
図面を参照しながら説明する。Hereinafter, embodiments of the noise reduction device according to the present invention will be described with reference to the drawings.
第１図は本発明にかかる騒音低減装置の装着時の断面
図である。FIG. 1 is a cross-sectional view when a noise reduction device according to the present invention is mounted.
この第１図において騒音低減装置は、外耳道Ａの内径
W0と略同一の内径Ｗに形成され、一端側に可撓性を有す
る例えば合成樹脂やゴム材等の耳介装着部材４が設けら
れ、他端側が音声の無反射端となるように例えばフェル
ト等の吸音材５が設けられた音響管１と、上記音響管１
の周面にそれぞれ振動面を管内方に臨ませて互いに近接
して取り付けられるイヤホンユニット３及び内部マイク
ロホンユニット６とで構成されている。In FIG. 1, the noise reduction device is the inner diameter of the ear canal A.
W 0 and is formed in a substantially same inner diameter W, one end side flexible auricle-mounting member 4, for example, such as a synthetic resin or rubber material having the provided, for example, as the other end side is no reflection end of the speech An acoustic tube 1 provided with a sound absorbing material 5 such as felt;
The earphone unit 3 and the internal microphone unit 6 are mounted close to each other with the vibrating surface facing the inside of the tube on each of the peripheral surfaces.
上記音響管１は、イヤホ筐体となるものであって内径
Ｗを均一、かつ、外耳道Ａの内径W0と略同一とし、上記
他端側に音声の無反射端となるように吸音材５を設ける
ことにより、当該音響管１の音響インピーダンスを外耳
道Ａのインピーダンスと略同一となるようにしており、
いわゆる頭内定位現象を防止するように構成されてい
る。また、この音響インピーダンスの変化を防止するた
めに上記イヤホンユニット3,内部マイクロホンユニット
６は音響管１の側面にそれぞれの振動板が平行となるよ
うに、また、該音響管１の断面積S1が、該イヤホンユニ
ット3,内部マイクロホンユニット６の取り付け部の各断
面積S2,S3と略同一となるように取り付けられている。The acoustic tube 1 serves as an earphone housing, has a uniform inner diameter W, is substantially the same as the inner diameter W 0 of the ear canal A, and has a sound absorbing material 5 on the other end side so as to be a non-reflective end of sound. Is provided so that the acoustic impedance of the acoustic tube 1 is substantially the same as the impedance of the ear canal A,
It is configured to prevent the so-called intra-head localization phenomenon. In order to prevent the change of the acoustic impedance, the earphone unit 3 and the internal microphone unit 6 are arranged such that the respective diaphragms are parallel to the side surface of the acoustic tube 1 and the cross-sectional area S 1 of the acoustic tube 1. Are mounted so as to have substantially the same cross-sectional areas S 2 and S 3 of the mounting portion of the earphone unit 3 and the internal microphone unit 6.
第２図に当該騒音低減装置の具体的なブロック図を示
す。FIG. 2 shows a specific block diagram of the noise reduction device.
この第２図において、入力端子７を介して例えば受信
信号等がイコライザ８に供給される。In FIG. 2, for example, a received signal or the like is supplied to an equalizer 8 via an input terminal 7.
イコライザ８は、上記供給される受信信号の周波数の
例えば中域を上げる等して、該受信信号の音声部分を強
調して出力する。この出力信号は後に説明する加算器９
を介して制御回路10に供給される。なお、このイコライ
ザ８での周波数調整は任意のレベル調整を行えばよい。The equalizer 8 enhances the audio portion of the received signal by, for example, increasing the middle frequency of the supplied received signal, and outputs it. This output signal is supplied to an adder 9 described later.
Is supplied to the control circuit 10 via the. Note that the frequency adjustment by the equalizer 8 may be any level adjustment.
制御回路10は、イコライザ８からイヤホンユニット３
までの間の回路全体が、外部騒音が耳に到達する間の音
響的な周波数特性に対応するように上記加算器９を介し
て供給される出力信号の周波数特性を制御する。The control circuit 10 sends the signal from the equalizer 8 to the earphone unit 3.
The entire circuit controls the frequency characteristics of the output signal supplied via the adder 9 so as to correspond to the acoustic frequency characteristics while the external noise reaches the ear.
この制御回路10からの出力信号は、アンプ11を介して
イヤホンユニット３に供給される。なお、このアンプ11
は、再生音声を聴取しやくするため、増幅率を可変でき
るようにしてもよい。The output signal from the control circuit 10 is supplied to the earphone unit 3 via the amplifier 11. This amplifier 11
In order to make the reproduced sound easier to hear, the amplification factor may be made variable.
イヤホンユニット３は、供給されたアンプ11からの出
力信号を電気−音響変換して再生音声として発音する。The earphone unit 3 performs electro-acoustic conversion on the supplied output signal from the amplifier 11 and generates a reproduced sound.
ここで、加算器12は、イヤホンユニット３から発音さ
れることにより外耳道Ａに到達する上記再生音声と、入
力端子13から供給される、該イヤホンユニット３や音響
管１を介してまたはイヤホンユニット３と耳の隙間から
外耳道Ａに到達する外部騒音とを加算しており、この状
態をブロックで等化的に表現したものである。Here, the adder 12 outputs the reproduced sound reaching the external auditory meatus A by being sounded from the earphone unit 3 and the earphone unit 3 or the acoustic tube 1 supplied from the input terminal 13 or via the earphone unit 3. And the external noise that reaches the ear canal A from the gap between the ears, and this state is equalized by a block.
この外部騒音と加算された再生音声は、内部マイクロ
ホンユニット６で収音される。内部マイクロホンユニッ
ト６は、上記収音した再生音声の位相を反転し、上記加
算器９に供給する。The reproduced sound added to the external noise is collected by the internal microphone unit 6. The internal microphone unit 6 inverts the phase of the collected reproduced sound and supplies the inverted sound to the adder 9.
加算器９は、この内部マイクロホンユニット６から供
給される位相の反転された信号と、上記イコライザ８か
らの出力信号とを加算処理する。これにより、上記イヤ
ホンユニット３から発音する音声を外部騒音を除去した
明瞭な再生音声とすることができる。The adder 9 performs an addition process on the inverted signal supplied from the internal microphone unit 6 and the output signal from the equalizer 8. This makes it possible to convert the sound produced by the earphone unit 3 into a clear reproduced sound from which external noise has been removed.
この再生音声は出力端子Ｐを介して出力される。 This reproduced sound is output via the output terminal P.
すなわち、上記入力端子７から供給される信号レベル
をS,内部マイクロホンユニット６の伝達関数をM,制御回
路10の伝達関数をβ，アンプ11の伝達関数をA,イヤホン
ユニット３の伝達関数をH,入力端子13から供給される外
部騒音レベルをN,出力端子14から出力される再生音声レ
ベルをＰとすると、再生音声レベルＰは、 とあらわされる。なお、上記各伝達関数M,β,A,Hは、周
波数領域であらわしている。このとき、AHMβ≫１であ
れば、再生音声レベルＰは、 となる。これからAHMβ≫１の条件を満足すれば再生音
声レベルＰは、上記アンプ11の伝達関数A,イヤホンユニ
ット３の伝達関数Ｈに左右されないことがわかる。この
ため、アンプ11の利得をAHMβ≫１を満足する条件の下
で可変することにより、再生音声のレベルに関係なく、
内部マイクロホンユニット６で負帰還した外部騒音のレ
ベルを可変することができ、例えば外部騒音が大きいと
きには、アンプ11の利得を大きくし騒音低減量を多く
し、逆に外部騒音の小さいときにはアンプ11の利得を小
さくすることにより上記頭内定位現象を有効に防止し、
再生音声を明瞭に聴取することができる。That is, the signal level supplied from the input terminal 7 is S, the transfer function of the internal microphone unit 6 is M, the transfer function of the control circuit 10 is β, the transfer function of the amplifier 11 is A, and the transfer function of the earphone unit 3 is H. Assuming that the external noise level supplied from the input terminal 13 is N and the reproduced audio level output from the output terminal 14 is P, the reproduced audio level P is It is expressed. Each of the transfer functions M, β, A, and H is represented in a frequency domain. At this time, if AHMβ≫1, the reproduced audio level P is Becomes From this, it can be seen that if the condition of AHMβ≫1 is satisfied, the reproduced sound level P is not affected by the transfer function A of the amplifier 11 and the transfer function H of the earphone unit 3. Therefore, by changing the gain of the amplifier 11 under the condition satisfying AHMβ≫1, regardless of the level of the reproduced sound,
The level of the external noise negatively fed back by the internal microphone unit 6 can be varied. For example, when the external noise is large, the gain of the amplifier 11 is increased to increase the noise reduction amount. By reducing the gain, the above head localization phenomenon is effectively prevented,
The reproduced sound can be clearly heard.
第３図は、このような騒音低減装置をいわゆるヘッド
セットに適用した外観を示す図である。FIG. 3 is a diagram showing an appearance in which such a noise reduction device is applied to a so-called headset.
この第３図において、音響インピーダンスに影響を与
えない範囲で音響管１を屈曲し、それぞれの装着部材４
が外耳道入口と対向するように２つの音響管1,1を連結
部材15により連結し、例えばこの連結部材15等にバー21
の端部を取り付け、該バー21の他端に送信用マイクロホ
ンを取り付ける。そして、この２つの音響管1,1をヘア
バンドとして頭部Ｅにかけわたし、上記音響管１の装着
部材４をやや開きかげんにして耳介Ｄにに装着するよう
にすれば、この装着部材４が外耳道Ａの入口に両側から
圧迫しない程度に押し付けられて装着されることとな
り、この装着部材４が耳介Ｄから外れることを防止でき
良好な装着及び明瞭な交信を行うことができる。In FIG. 3, the acoustic tube 1 is bent within a range that does not affect the acoustic impedance, and each mounting member 4 is bent.
Are connected by a connecting member 15 so that the two acoustic tubes 1 and 1 face the entrance of the ear canal.
And a transmission microphone is attached to the other end of the bar 21. Then, the two acoustic tubes 1, 1 are applied to the head E as a hair band, and the attachment member 4 of the acoustic tube 1 is slightly opened to be attached to the auricle D. Is pressed against the entrance of the ear canal A from both sides so as not to be pressed, and the mounting member 4 can be prevented from coming off the pinna D, so that good mounting and clear communication can be performed.
以上の説明から明らかなように、本発明にかかる騒音
低減装置は、上記音響管１を用いているため、該管内の
音声の反射がなく頭内定位現象を生ずることがなく、外
部騒音を有効に低減でき、小型軽量化を達成できる。こ
のため、大音量再生としなくとも音声等が明瞭に聴取で
き、周囲に聴取している音声等を洩らすことがない。な
お、上記負帰還ループによりイヤホンユニットの歪みを
も低減することができる。As apparent from the above description, since the noise reduction device according to the present invention uses the above-described acoustic tube 1, there is no reflection of sound in the tube, no in-head localization phenomenon occurs, and external noise is effectively reduced. And a reduction in size and weight can be achieved. For this reason, the sound and the like can be clearly heard even if the sound volume is not reproduced at a high volume, and the sound and the like heard around are not leaked. The distortion of the earphone unit can be reduced by the negative feedback loop.
また、例えばヘッドセットとして使用した場合、耳を
ヘッドホンカップ等で覆い圧迫する必要がないため、長
時間の装着による疲労をも少なくすることができる。Further, for example, when used as a headset, it is not necessary to cover the ears with a headphone cup or the like and press it, so that fatigue due to wearing for a long time can be reduced.
なお、本発明にかかる騒音低減装置は、上記実施例の
みに限定されるものではなく、例えば、小型携帯用ヘッ
ドホンプレーヤ等のイヤホン装置や電話器の送受話器等
に用いてもよいこと等は勿論である。The noise reduction device according to the present invention is not limited to the above embodiment, and may be used for an earphone device such as a small portable headphone player or a handset of a telephone. It is.
本発明にかかる騒音低減装置は、外耳道と略同一の内
径に形成され、一端側が耳介装着部となされ、他端側が
音声の無反射端となされた音響管と、装着時においてそ
れぞれ耳の近傍に設けられるとともに、上記音響管の周
面に各振動面を管内方に臨ませて互いに近接して取り付
けられるイヤホンユニット及び内部マイクロホンユニッ
トとを有し、上記内部マイクロホンユニットで収音した
上記音響管内の外部騒音の位相を反転させ、上記イヤホ
ンユニットで発音することにより外部騒音を有効に低減
し、良好な再生音を聴取することができる。The noise reduction device according to the present invention has an acoustic tube having substantially the same inner diameter as the ear canal, one end of which serves as an auricle attachment portion, and the other end of which serves as a non-reflection end of sound. And an earphone unit and an internal microphone unit that are attached close to each other with the respective vibrating surfaces facing the inside of the tube on the peripheral surface of the acoustic tube, and the inside of the acoustic tube collected by the internal microphone unit. By inverting the phase of the external noise and generating sound with the earphone unit, the external noise can be effectively reduced and a good reproduced sound can be heard.
第１図は本発明にかかる騒音低減装置の断面図、第２図
該実施例の騒音低減装置のブロック図、第３図は本発明
にかかる騒音低減装置をヘッドセットに適用した場合の
外観を示す図である。 １……音響管 ３……イヤホンユニット ４……装着部材 ５……吸音材 ６……内部マイクロホンユニット 7,13……入力端子 ８……イコライザ 9,12……加算器 10……制御回路 11……アンプ 14……出力端子1 is a cross-sectional view of a noise reduction device according to the present invention, FIG. 2 is a block diagram of the noise reduction device of the present embodiment, and FIG. 3 is an external view of the noise reduction device according to the present invention applied to a headset. FIG. DESCRIPTION OF SYMBOLS 1 ... Acoustic tube 3 ... Earphone unit 4 ... Mounting member 5 ... Sound absorbing material 6 ... Internal microphone unit 7, 13 ... Input terminal 8 ... Equalizer 9, 12 ... Adder 10 ... Control circuit 11 …… Amplifier 14 …… Output terminal
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭57−41095（ＪＰ，Ａ) 特開 昭47−19821（ＪＰ，Ａ) 特開 平３−214893（ＪＰ，Ａ) 特表 昭63−503186（ＪＰ，Ａ) 実開 昭53−117227（ＪＰ，Ｕ) 実公 昭39−24622（ＪＰ，Ｙ１) (58)調査した分野(Int.Cl.6，ＤＢ名) H04R 1/10 104 G10K 11/16──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-41095 (JP, A) JP-A-47-21821 (JP, A) JP-A-3-214893 (JP, A) Table of Japanese Patent Publication Sho 63- 503186 (JP, A) Shokai Sho 53-117227 (JP, U) Shoko Sho 39-24622 (JP, Y1) (58) Fields investigated (Int. Cl. 6 , DB name) H04R 1/10 104 G10K 11/16
Claims (1)
が耳介装着部となされ、他端側が音声の無反射端となさ
れた音響管と、 装着時においてそれぞれ耳の近傍に設けられるととも
に、上記音響管の周面に各振動面を管内方に臨ませて互
いに近接して取り付けられるイヤホンユニット及び内部
マイクロホンユニットとを有し、 上記内部マイクロホンユニットで収音した上記音響管内
の外部騒音の位相を反転させ、上記イヤホンユニットで
発音することにより外部騒音を低減することを特徴とす
る騒音低減装置。1. An acoustic tube having substantially the same inner diameter as the ear canal, one end of which serves as an auricle attachment portion, and the other end of which serves as a non-reflection end of sound. An earphone unit and an internal microphone unit which are attached to each other with the respective vibrating surfaces facing the inside of the tube on the peripheral surface of the sound tube, and an internal microphone unit, wherein external noise in the sound tube collected by the internal microphone unit is A noise reduction device characterized in that external noise is reduced by inverting the phase and generating sound with the earphone unit.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008509A JP2778173B2 (en) | 1990-01-19 | 1990-01-19 | Noise reduction device |
| EP91902743A EP0464220B1 (en) | 1990-01-19 | 1991-01-18 | Earphone device |
| PCT/JP1991/000058 WO1991011078A1 (en) | 1990-01-19 | 1991-01-18 | Earphone device |
| DE69113333T DE69113333T2 (en) | 1990-01-19 | 1991-01-18 | EARPIECE DEVICE. |
| KR1019910701122A KR100231219B1 (en) | 1990-01-19 | 1991-01-18 | Earphone device |
| US08/018,468 US5276740A (en) | 1990-01-19 | 1993-02-16 | Earphone device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008509A JP2778173B2 (en) | 1990-01-19 | 1990-01-19 | Noise reduction device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03214892A JPH03214892A (en) | 1991-09-20 |
| JP2778173B2 true JP2778173B2 (en) | 1998-07-23 |
Family
ID=11695099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2008509A Expired - Fee Related JP2778173B2 (en) | 1990-01-19 | 1990-01-19 | Noise reduction device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2778173B2 (en) |
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| Publication number | Publication date |
|---|---|
| JPH03214892A (en) | 1991-09-20 |
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