JPH09140000A - Loud hearing aid for conference - Google Patents
Loud hearing aid for conferenceInfo
- Publication number
- JPH09140000A JPH09140000A JP29658095A JP29658095A JPH09140000A JP H09140000 A JPH09140000 A JP H09140000A JP 29658095 A JP29658095 A JP 29658095A JP 29658095 A JP29658095 A JP 29658095A JP H09140000 A JPH09140000 A JP H09140000A
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- Prior art keywords
- sound
- sound source
- source direction
- microphone array
- microphone
- Prior art date
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- Control Of Amplification And Gain Control (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、主に難聴者が使用する
会議用拡聴器に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conference hearing aid mainly used by a hearing impaired person.
【０００２】[0002]
【従来の技術】補聴器を装用していれば、一対一の会話
にはそれほど不自由しない補聴者の中でも、会議や講演
会等のように、話者との距離が遠くなると、相手の言っ
ていることがわからなくなると訴える人が非常に多い。
これには大きく二つの理由が考えられる。2. Description of the Related Art If a hearing aid is worn, even if the hearing aid is not too inconvenient for one-on-one conversation, the distance between the hearing aid and the speaker will increase, as in a conference or lecture. There are so many people who complain that they don't understand that they are there.
There are two main reasons for this.
【０００３】一つは入力音圧レベルの低下である。一般
に音源と受聴位置の距離が遠くなれば遠くなるほど入力
音圧レベルは低下する。どのくらい低下するかは音源の
指向性や部屋の反響の状態に依存するが、例えば自由音
場（壁，床，天井等の音を反射する境界が全くない仮想
空間）で音源を点音源（３６０度どの方向にも均等に音
を放射する仮想音源）と仮定すると、音圧レベルは、音
源と受聴点の距離が２倍になると６ｄＢ減衰する。実際
の部屋では直接音だけでなく境界での反射音が加算され
るため、それほど減衰しないものの、５ｍも離れると１
ｍの位置での音圧レベルから１０ｄＢ程度は減衰する。
健聴者の場合、比較的静かな部屋での１０ｄＢ程度の減
衰であれば、話者が普通に発話していれば十分に聴き取
れるが、難聴者、特に内耳、聴覚神経に障害のある感音
性難聴者の場合かなり聴き取りにくくなる。One is a decrease in the input sound pressure level. Generally, as the distance between the sound source and the listening position increases, the input sound pressure level decreases. How much is reduced depends on the directivity of the sound source and the state of reverberation of the room. For example, the sound source is a point sound source (360) in a free sound field (a virtual space where there is no boundary such as walls, floors, and ceilings that reflects sound). Assuming that the sound source emits sound evenly in any direction), the sound pressure level is attenuated by 6 dB when the distance between the sound source and the listening point is doubled. In the actual room, not only the direct sound but also the reflected sound at the boundary is added, so it is not attenuated so much
The sound pressure level at the position m is attenuated by about 10 dB.
In the case of a hearing-impaired person, if the attenuation is about 10 dB in a relatively quiet room, it can be sufficiently heard if the speaker speaks normally, but the deafness, especially the inner ear and the auditory nerves are impaired. People with sexual hearing loss will find it very difficult to hear.
【０００４】入力音圧レベルの低下と並ぶもう一つの理
由は、暗騒音と部屋の残響である。部屋の空調等で生じ
る背景雑音である暗騒音はほぼ一定であるから、話者の
声の入力音圧レベルが小さくなれば、当然ＳＮ比は悪く
なる。また、上記のように話者が遠くなると、直接音が
小さくなり、間接音である部屋の残響成分が相対的に大
きくなる。残響成分も暗騒音同様にことばの明瞭性を阻
害する。さらに難聴者の場合、この暗騒音、残響の音響
を健聴者に比べてより大きく受けることが確認されてい
る。Another reason along with the reduction in input sound pressure level is background noise and room reverberation. Background noise, which is background noise generated in room air-conditioning and the like, is almost constant. Therefore, when the input sound pressure level of the voice of the speaker decreases, the SN ratio naturally deteriorates. Further, as the speaker gets farther away, the direct sound becomes smaller and the reverberation component of the room, which is an indirect sound, becomes relatively larger as described above. The reverberation component also obstructs the clarity of the word like the background noise. Furthermore, it has been confirmed that the background noise and reverberant sound are received more significantly by a hearing-impaired person than by a hearing-impaired person.
【０００５】前者の入力音圧レベルの低下に対しては、
従来は難聴者自身が補聴器のボリュームコントローラで
利得を調節するしかなかった。しかし、入力音圧レベル
が変わる（例えば、話者が変わる）度に利得を調整する
ことは非常に煩わしく、うるさくて耐えられない時（例
えば地下鉄車内等）以外、ボリュームコントローラは動
かさないという人も多い。結果的に「声の小さい人、遠
くで発言している人の声は聴こえづらい」ことになる。
例えばコンプレッサと呼ばれる装置は、入力信号のダイ
ナミックレンジを圧縮して相対的に小さいレベルの入力
に対する利得を増やすことができる。しかしこの装置で
距離減衰による音圧低下を補償するには大きな圧縮率が
必要であり、その結果、目的音声が歪んでしまい明瞭性
を損ねてしまう。Regarding the former decrease in the input sound pressure level,
In the past, the hearing-impaired person had no choice but to adjust the gain with the volume controller of the hearing aid. However, adjusting the gain each time the input sound pressure level changes (for example, the speaker changes) is very cumbersome, and some people may not operate the volume controller except when it is noisy and unbearable (for example, in a subway car). Many. As a result, "the voice of a person with a small voice and a person speaking far away is hard to hear".
For example, a device called a compressor can compress the dynamic range of the input signal to increase the gain for relatively small levels of input. However, in this device, a large compression rate is required to compensate for the sound pressure drop due to the distance attenuation, and as a result, the target voice is distorted and the clarity is impaired.
【０００６】後者の雑音，残響の影響に対しては、 １，マルチマイクロホンで目的音方向への指向性を鋭く
する方法（雑音，残響，両方に効果あり） ２，雑音は主に低域成分が強いことから、ハイパスフィ
ルタで低域をカットする方法（雑音のみに効果あり） ３，時間的に音入力を監視して、音声のみを増幅する方
法（雑音のみに効果あり） 等、様々な雑音・残響抑圧法が考えられている。Regarding the latter effects of noise and reverberation, 1. A method of sharpening directivity in the direction of the target sound with a multi-microphone (effective for both noise and reverberation) 2. Noise is mainly low-frequency components Since it is strong, there are various methods such as a method of cutting the low frequency band with a high-pass filter (effective only for noise), a method of monitoring the sound input temporally and amplifying only voice (effective only for noise), etc. Noise and dereverberation methods are being considered.
【０００７】[0007]
【発明が解決しようとする課題】しかし、難聴者の会議
受聴において不可欠なこれら二つの技術、即ち利得の自
動補償と雑音抑圧を同時に行なえる装置は従来なかっ
た。However, there has not been a device capable of simultaneously performing these two techniques, that is, the automatic gain compensation and the noise suppression, which are indispensable for a hearing-impaired person to hear the conference.
【０００８】本発明の目的は、難聴者が会議等で使用す
る拡聴器において、背景雑音を抑圧し、目的音声のみを
適切な音量でかつ歪みなく受聴できるものを提供するこ
とである。An object of the present invention is to provide a hearing aid used by a hearing-impaired person in a conference or the like, which can suppress background noise and can receive only the target sound at an appropriate volume and without distortion.
【０００９】[0009]
【課題を解決するための手段】本発明に係る会議用拡聴
器は、集音しようとする音源方向を検出する音源方向検
出手段と、この音源方向検出手段で検出された方向の音
を集音する集音手段と、音の指向性が切り替わる度に出
力レベルが一定になるように利得を自動的に調整する自
動利得調整手段とを備えたものである。A conference loudspeaker according to the present invention collects a sound source direction detecting means for detecting a sound source direction from which sound is to be collected, and a sound in the direction detected by the sound source direction detecting means. The sound collecting means and the automatic gain adjusting means for automatically adjusting the gain so that the output level becomes constant each time the directivity of the sound is switched.
【００１０】そして、前記集音手段は、マイクロホンア
レイであり、前記音源方向検出手段では、前記マイクロ
ホンアレイの両端のマイクロホンに入る音波の到来時間
差を利用して音源方向を検出するようにしたものであ
る。The sound collecting means is a microphone array, and the sound source direction detecting means detects the sound source direction by utilizing a difference in arrival time of sound waves entering the microphones at both ends of the microphone array. is there.
【００１１】さらに、マイクロホンアレイに、遅延和マ
イクロホンアレイを用いたものである。Further, a delay sum microphone array is used as the microphone array.
【００１２】[0012]
【作用】本発明においては、目的音（発言者）の方向を
検出し、その方向の音を集音し、出力する。発言者が変
わるなどして目的音の方向が変わったとき、それに応じ
て利得を自動的に調整し、出力レベルを一定に保つ。In the present invention, the direction of the target sound (speaker) is detected, and the sound in that direction is collected and output. When the direction of the target sound changes, such as when the speaker changes, the gain is automatically adjusted accordingly to keep the output level constant.
【００１３】また、マイクロホンアレイを用いてその両
端のマイクロホンに入る音波の到来の時間差を利用して
音源方向を探し、その方向にマイクロホンの指向性を向
ける。指向性を切り替えた時点から入力音圧のパワーを
測定し、その結果に基づいて利得を決め、適当な立上が
り、立下がりで、その利得まで増幅あるいは減衰させて
自動調整する。The microphone array is used to search for the sound source direction by utilizing the time difference of arrival of sound waves entering the microphones at both ends of the microphone array, and directivity of the microphones is directed to the direction. The power of the input sound pressure is measured from the time when the directivity is switched, the gain is determined based on the result, and the gain or gain is amplified or attenuated at an appropriate rise and fall to automatically adjust.
【００１４】さらに、マイクロホンアレイに遅延和マイ
クロホンアレイを用い、各マイクロホンの遅延量を異な
らせて出力の和をとることにより鋭い指向性を得る。Further, a sharp sum directivity is obtained by using a delay sum microphone array as the microphone array and varying the delay amount of each microphone to obtain the sum of the outputs.
【００１５】[0015]
【実施例】図１は、本発明の一実施例の基本構成を示す
ブロック図である。この図において、１０は集音手段
で、指向性を変えることができるマイクロホンが用いら
れる。２０は音源方向検出手段で、入力音の方向を検知
する。３０は自動利得調整（ＡＧＣ）手段で、前段の音
源方向検出手段２０の出力をトリガとして起動する。４
０は増幅手段で、集音手段１０の出力を増幅し、適当な
レベルとして出力する。また、出力レベルを可変できる
ように構成されている。一旦決めたレベルの調整はＡＧ
Ｃ手段３０によって自動的に行なわれる。1 is a block diagram showing the basic construction of an embodiment of the present invention. In this figure, 10 is a sound collecting means, and a microphone whose directivity can be changed is used. Reference numeral 20 denotes a sound source direction detecting means for detecting the direction of the input sound. An automatic gain adjustment (AGC) unit 30 is activated by the output of the sound source direction detection unit 20 in the preceding stage as a trigger. 4
Reference numeral 0 is an amplification means, which amplifies the output of the sound collection means 10 and outputs it as an appropriate level. Further, the output level is variable. Adjusting the level once decided is AG
It is automatically performed by the C means 30.
【００１６】次に、動作について説明する。集音手段１
０に発言者の発音が入力されると、その入力方向（音源
方向）が音源方向検出手段２０で検出される。この検出
された音源方向に集音手段１０の指向性が調整される。
このようにして集音が行なわれ、その出力は増幅手段４
０で増幅される。発言者が変わるなどして音源の方向が
変わると、出力レベルも変動するので、ＡＧＣ手段３０
は出力レベルを一定に保つように増幅手段４０の利得を
自動調整する。Next, the operation will be described. Sound collecting means 1
When the speaker's pronunciation is input to 0, the input direction (sound source direction) is detected by the sound source direction detecting means 20. The directivity of the sound collecting means 10 is adjusted in the detected sound source direction.
Sound is collected in this way, and the output is amplified by the amplifying means 4.
It is amplified by 0. When the direction of the sound source changes due to a change in speaker, the output level also changes, so the AGC means 30
Automatically adjusts the gain of the amplifying means 40 so as to keep the output level constant.
【００１７】図２は、本発明のより具体的な実施例の構
成を示すブロック図である。この実施例では、集音手段
１０を６個のマクロホン１１からなるマイクロホンアレ
イ１２と、各マイクロホン１１の出力をそれぞれ増幅す
る増幅器１３と、遅延和回路１４とで構成されており、
遅延和回路１４はさらに可変遅延素子１５と加算器１６
とで構成されている。FIG. 2 is a block diagram showing the configuration of a more specific embodiment of the present invention. In this embodiment, the sound collecting means 10 is composed of a microphone array 12 consisting of six microphones 11, an amplifier 13 for amplifying the output of each microphone 11, and a delay sum circuit 14.
The delay sum circuit 14 further includes a variable delay element 15 and an adder 16
It is composed of
【００１８】また、増幅手段４０は増幅器４１と利得乗
算器４２で構成されている。音源方向検出手段２０はマ
イクロホンアレイ１２の両端マイクロホン１１の出力
（両端の増幅器１３の出力）の時間差を利用している。
ＡＧＣ手段３０は音源方向検出手段２０の出力をトリガ
として起動し、増幅器４１の出力レベルを監視し、増幅
手段４０の出力が一定になるように利得乗算器４２の乗
算率を自動調整する。５０はヘッドホンを示す。The amplifying means 40 is composed of an amplifier 41 and a gain multiplier 42. The sound source direction detecting means 20 utilizes the time difference between the outputs of the microphones 11 at both ends of the microphone array 12 (outputs of the amplifiers 13 at both ends).
The AGC means 30 is activated by using the output of the sound source direction detecting means 20 as a trigger, monitors the output level of the amplifier 41, and automatically adjusts the multiplication rate of the gain multiplier 42 so that the output of the amplifying means 40 becomes constant. 50 indicates headphones.
【００１９】次に、動作について説明する。まず、音源
方向検出手段２０において、マイクロホンアレイ１２の
両端のマイクロホン１１に入る音波の到達時間差を利用
して音源方向を推定する。時間差の算出には、二つの入
力信号の相互相関関数を計算し、そのピーク位置を検出
する方法がある。音源方向を推定した後、その方向へ指
向性を向ける。一例として、指向性を目的音方向へ鋭
く、かつ電気的に可変にするように遅延和マイクロホン
アレイを用いる。Next, the operation will be described. First, in the sound source direction detecting means 20, the sound source direction is estimated using the arrival time difference of the sound waves entering the microphones 11 at both ends of the microphone array 12. To calculate the time difference, there is a method of calculating the cross-correlation function of two input signals and detecting the peak position thereof. After estimating the sound source direction, directivity is directed in that direction. As an example, a delay-and-sum microphone array is used so that the directivity can be made sharp and electrically variable in the direction of the target sound.
【００２０】遅延和マイクロホンアレイで鋭い指向性が
得られる原理を図３を用いて説明する（「音響システム
とディジタル処理」，平成７年３月２５日（初版）電子
情報通信学会発行参照）。目的音源が、マイクロホン１
１から十分遠い距離（原理的には無限遠方）にあると
し、マイクロホン１１には平面波が入力するものと近似
する。各マイクロホン入力信号に次式で表される遅延を
付加する（θL は目的音方向、ｃは音速）。 Ｄｉ＝（１−ｉ）τL ただし、ｉ＝１，２，３，・・・，Ｎ …（１） τL ＝（ｄｓｉｎθL ）／ｃ …（２） 目的音がθL 方向から入射しているとすると、各マイク
ロホン１１で受音する信号ｘｉ（ｔ）は、以下のように
表される。 ｘｉ（ｔ）＝ｘ１（ｔ−（ｉ−１）τL ） …（３） この信号に（１）式の遅延を付加すると、 ｘｉ（ｔ−Ｄｉ）＝ｘ１（ｔ） …（４） となり、各マイクロホン入力信号が全て同相の信号とな
る。即ち音源方向からの信号は全て同相化され、強調さ
れる。一方、他方向からの信号は時間的にずれたままで
あり、Ｎ個加算しても強調効果は少ないので、結果的に
目的音方向へ鋭い指向性が得られる。The principle of obtaining a sharp directivity with the delay-and-sum microphone array will be described with reference to FIG. 3 (see “Acoustic system and digital processing”, published by the Institute of Electronics, Information and Communication Engineers, March 25, 1995 (first edition)). The target sound source is the microphone 1
It is assumed that the distance is sufficiently far from 1 (in principle, an infinite distance), and it is approximated that a plane wave is input to the microphone 11. A delay represented by the following equation is added to each microphone input signal (θ L is the target sound direction, c is the speed of sound). Di = (1-i) τ L However, i = 1, 2, 3, ..., N (1) τ L = (dsin θ L ) / c (2) The target sound is incident from the θ L direction. If so, the signal xi (t) received by each microphone 11 is expressed as follows. xi (t) = x1 (t- (i-1) [tau] L ) (3) When the delay of the equation (1) is added to this signal, xi (t-Di) = x1 (t) (4) , All the microphone input signals are in-phase signals. That is, all signals from the sound source direction are in-phase and emphasized. On the other hand, the signals from the other directions remain shifted in time, and even if N pieces are added, the enhancement effect is small, and as a result, sharp directivity in the target sound direction is obtained.
【００２１】指向性を切り替えると同時に音源方向検出
手段２０より出力されるトリガでＡＧＣ手段３０を作動
させ、必要利得を計算し、適当な立上がり、もしくは立
下がりを付加して利得乗算器４２で入力信号に乗算す
る。At the same time when the directivity is switched, the AGC means 30 is operated by the trigger output from the sound source direction detecting means 20, the required gain is calculated, an appropriate rise or fall is added, and the gain multiplier 42 inputs the gain. Multiply the signal.
【００２２】図４は、本発明を実際の会議で使用した場
合の一例である。図４において１００はテーブル、２０
１〜２１０は会議の出席者である。いま出席者２０３が
発言者、２０７が本発明の会議用拡聴器の装用者を示
す。指向性を適応的に変えることができる遅延和型のマ
イクロホンアレイ１２は、常に発言者２０３の方向に指
向性が向いており、話者が変わる毎にその指向方向は音
源方向検出手段２０（図２）により切り替わる。また同
時に、ＡＧＣ手段３０において必要利得を計算し、声が
小さい、あるいは距離が遠い話者の音声に対して、適切
な利得補償をする。その信号を例えば磁気を発生する磁
気コイル型のヘッドホン５０等に入力し、Ｔモード補聴
器（マイクの他に誘電磁気を拾うコイルを内蔵し、切替
え使用するようになっており、それぞれＴモード，Ｍモ
ードと呼ばれている。）で受聴する。FIG. 4 shows an example of using the present invention in an actual conference. In FIG. 4, 100 is a table, 20
1-210 are attendees of the conference. Attendee 203 is a speaker and 207 is a person wearing the conference hearing aid of the present invention. The delay-sum type microphone array 12 capable of adaptively changing the directivity always has the directivity in the direction of the speaker 203, and the directivity direction is changed every time the speaker is changed. It changes by 2). At the same time, the AGC means 30 calculates the required gain, and performs appropriate gain compensation for the voice of a speaker who has a small voice or a long distance. The signal is input to, for example, a magnetic coil type headphone 50 that generates magnetism, and a T mode hearing aid (a coil that picks up a dielectric magnetism in addition to a microphone is built in and used for switching. It is called a mode.)
【００２３】なお、上記実施例では、音源方向検出手段
２０は集音手段１０のマイクロホンを利用したが、これ
は別個に設けたものであってもよく、また、２本以上の
複数のマイクロホンを利用して空間的に探索する方法
や、人間の頭のように、２つのマイクロホンの間に障害
物をおくことで、音の回折情報を利用する方法などでも
よい。In the above embodiment, the sound source direction detecting means 20 uses the microphone of the sound collecting means 10. However, this may be provided separately, and two or more microphones may be provided. It may be a method of spatially searching by using, or a method of using sound diffraction information by placing an obstacle between two microphones like a human head.
【００２４】[0024]
【発明の効果】以上のように本発明によれば、集音しよ
うとする音源方向を検出する音源方向検出手段と、この
音源方向検出手段で検出された方向の音を集音する集音
手段と、音の指向性が切り替わる度に出力レベルが一定
になるように利得を自動的に調整する自動利得調整手段
とを備えたので、常に話者の方向へ指向性を向けること
ができるため、空調の騒音や、大勢の人が一斉にしゃべ
ったザワザワとしたマルチトーカノイズ等を抑圧し、発
言者の声をより明瞭に聴くことができる。さらにＡＧＣ
手段により利得の補償を行なうことにより遠くにいる話
者や声の小さい話者の声に対してもその都度ボリューム
コントローラを使用者が補正せずに済む。その補正も話
者が変わった時のみ緩やかに行なうことにより、コンプ
レッサを使用したダイナミックレンジを圧縮する従来の
方法で起こるような音声の歪みは生じず、使用者が自分
でボリュームコントローラを適宜動かすのに近い動作が
実現でき、歪みのない明瞭な音声を常に受聴できること
になり、今まで会議での音声の受聴が困難、あるいは不
可能であった難聴者でも容易に会議場などで快適に相手
の人の話しを聴くことが可能となる。As described above, according to the present invention, the sound source direction detecting means for detecting the direction of the sound source to be collected, and the sound collecting means for collecting the sound in the direction detected by the sound source direction detecting means. Since, with the automatic gain adjusting means for automatically adjusting the gain so that the output level becomes constant every time the directivity of the sound is switched, since the directivity can be always directed to the speaker, Suppresses noise from air conditioning and the multi-talker noise that a lot of people talked about all at once, making it possible to hear the voice of the speaker more clearly. Furthermore AGC
By compensating the gain by means, the user does not have to correct the volume controller for the voice of a speaker far away or a speaker with a small voice. The correction is performed gently only when the speaker changes, so that the sound distortion that occurs in the conventional method of compressing the dynamic range using a compressor does not occur, and the user can move the volume controller by himself. This makes it possible to achieve operations similar to those of the above, and to always be able to listen to clear, undistorted audio, making it easy for people with hearing loss who have previously been unable or unable to hear audio at meetings to comfortably hear at the meeting place. It becomes possible to listen to people's stories.
【００２５】また、集音手段として、マイクロホンアレ
イを用いたので、指向性の制御が容易であり、しかも両
端のマイクロホンを用いて音源方向の検出ができる利点
がある。Further, since the microphone array is used as the sound collecting means, the directivity can be easily controlled, and the sound source direction can be detected by using the microphones at both ends.
【００２６】さらに、マイクロホンアレイに遅延和マイ
クロホンアレイを用いたので、指向性が鋭くなり、快適
な受聴ができる利点がある。Further, since the delay sum microphone array is used as the microphone array, there is an advantage that the directivity becomes sharp and comfortable listening is possible.
【図１】本発明の一実施例の基本構成を示すブロック図
である。FIG. 1 is a block diagram showing a basic configuration of an embodiment of the present invention.
【図２】本発明の一実施例の構成を示すブロック図であ
る。FIG. 2 is a block diagram showing a configuration of one embodiment of the present invention.
【図３】図１の実施例に用いた遅延和マイクロホンアレ
イの動作原理を説明する図である。FIG. 3 is a diagram illustrating the operation principle of the delay-and-sum microphone array used in the embodiment of FIG.
【図４】本発明の一使用例を示す説明図である。FIG. 4 is an explanatory diagram showing a usage example of the present invention.
１０ 集音手段 １１ マイクロホン １２ マイクロホンアレイ １３ 増幅器 １４ 遅延和回路 １５ 可変遅延素子 １６ 加算器 ２０ 音源方向検出手段 ３０ ＡＧＣ手段 ４０ 増幅手段 ４１ 増幅器 ４２ 利得乗算器 ５０ ヘッドホン 10 sound collecting means 11 microphone 12 microphone array 13 amplifier 14 delay sum circuit 15 variable delay element 16 adder 20 sound source direction detecting means 30 AGC means 40 amplifying means 41 amplifier 42 gain multiplier 50 headphone
Claims (3)
源方向検出手段と、この音源方向検出手段で検出された
方向の音を集音する集音手段と、音の指向性が切り替わ
る度に出力レベルが一定になるように利得を自動的に調
整する自動利得調整手段とを備えたことを特徴とする会
議用拡聴器。1. A sound source direction detecting means for detecting a sound source direction to be collected, a sound collecting means for collecting a sound in a direction detected by the sound source direction detecting means, and each time the directivity of the sound is switched. A conference hearing aid, comprising: an automatic gain adjusting means for automatically adjusting the gain so that the output level becomes constant.
あり、前記音源方向検出手段では、前記マイクロホンア
レイの両端のマイクロホンに入る音波の到来時間差を利
用して音源方向を検出することを特徴とする請求項１に
記載の会議用拡聴器。2. The sound collecting means is a microphone array, and the sound source direction detecting means detects a sound source direction by utilizing a time difference of arrival of sound waves entering microphones at both ends of the microphone array. The conference hearing aid according to claim 1.
ンアレイであることを特徴とする請求項２に記載の会議
用拡聴器。3. The conference hearing aid according to claim 2, wherein the microphone array is a delay-and-sum microphone array.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29658095A JPH09140000A (en) | 1995-11-15 | 1995-11-15 | Loud hearing aid for conference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29658095A JPH09140000A (en) | 1995-11-15 | 1995-11-15 | Loud hearing aid for conference |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09140000A true JPH09140000A (en) | 1997-05-27 |
Family
ID=17835392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29658095A Pending JPH09140000A (en) | 1995-11-15 | 1995-11-15 | Loud hearing aid for conference |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09140000A (en) |
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