JPH0564290A - Sound collector - Google Patents
Sound collectorInfo
- Publication number
- JPH0564290A JPH0564290A JP22388891A JP22388891A JPH0564290A JP H0564290 A JPH0564290 A JP H0564290A JP 22388891 A JP22388891 A JP 22388891A JP 22388891 A JP22388891 A JP 22388891A JP H0564290 A JPH0564290 A JP H0564290A
- Authority
- JP
- Japan
- Prior art keywords
- level
- microphone
- output
- sub
- main 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.)
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Links
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- Stereophonic Arrangements (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、会議システムなどに用
いる、残響や騒音の混入の少ない収音装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound pickup device used for a conference system or the like, in which reverberation and noise are less mixed.
【０００２】[0002]
【従来の技術】近年、電子会議システムが普及しつつあ
る。これらのシステムでは、マイクロホンを話者から離
して机上に設置するため、騒音が混入しやすくＳ／Ｎが
悪い。このため、ボイススイッチなどで騒音を除去する
手段が用いられている。2. Description of the Related Art In recent years, electronic conference systems have become popular. In these systems, since the microphone is installed on the desk away from the speaker, noise is easily mixed and the S / N is bad. For this reason, a means for removing noise using a voice switch or the like is used.
【０００３】以下図面を参照しながら、上述した従来の
会議システムの収音装置の一例について説明する。An example of the sound collecting device of the conventional conference system described above will be described below with reference to the drawings.
【０００４】図６は従来の会議システムのマイクロホン
の設置と、収音装置のブロック図を示すものである。FIG. 6 is a block diagram of a microphone and a sound collecting device of a conventional conference system.
【０００５】図６において、１はマイクロホン、２はマ
イクロホン１の出力を減衰させて外部に出力する減衰
器、３はレベル検出器、４は減衰量制御器である。In FIG. 6, 1 is a microphone, 2 is an attenuator for attenuating the output of the microphone 1 and outputting it to the outside, 3 is a level detector, and 4 is an attenuation amount controller.
【０００６】マイクロホン１で収音した信号は、減衰器
２でレベル調節されて外部に出力される。マイクロホン
１の出力はレベル検出器３にも入力され、レベル検出器
３で信号レベルが求められる。その信号レベルに応じて
減衰量制御器４が減衰器２の減衰量を制御する。The signal picked up by the microphone 1 is level-adjusted by the attenuator 2 and output to the outside. The output of the microphone 1 is also input to the level detector 3, and the signal level is obtained by the level detector 3. The attenuation amount controller 4 controls the attenuation amount of the attenuator 2 according to the signal level.
【０００７】減衰量制御器では信号レベルがあらかじめ
設定した値を越えるまでは減衰器２の減衰量を大きく設
定し、低レベルの騒音を除去する。音声が入射して信号
レベルが上昇し、あらかじめ設定した値を超えると減衰
器２の減衰量を小さくして、外部に信号を出力する。In the attenuation amount controller, the attenuation amount of the attenuator 2 is set large until the signal level exceeds a preset value, and low level noise is removed. When sound enters and the signal level rises and exceeds a preset value, the attenuation amount of the attenuator 2 is reduced and the signal is output to the outside.
【０００８】従来は、ボイススイッチと呼ばれる、この
ような回路を組み込んで騒音を抑圧し、Ｓ／Ｎの向上を
図っていた。Conventionally, such a circuit called a voice switch has been incorporated to suppress noise and improve S / N.
【０００９】[0009]
【発明が解決しようとする課題】しかしながら、上記の
ような構成では、レベルの小さい騒音は除去できるが、
レベルの大きな騒音や、話者音声が壁や天井で反射して
マイクロホンに入射する残響音の除去には効果がないと
いう問題点を有していた。However, with the above-mentioned configuration, although noise with a low level can be removed,
There is a problem that it is not effective in removing a large level of noise or a reverberant sound that the speaker's voice reflects on a wall or ceiling and enters a microphone.
【００１０】本発明は上記問題点を解決するもので、レ
ベルの大きな騒音や、残響をも効果的に除去できる収音
装置を提供することを目的としている。The present invention solves the above problems, and an object of the present invention is to provide a sound pickup device capable of effectively removing noise with a large level and reverberation.
【００１１】[0011]
【課題を解決するための手段】上記目的を達成するため
に、本発明の収音装置は、話者に近接して設置した主マ
イクロホンと、主マイクロホンの出力を減衰させて外部
に出力する減衰器と、話者から離して部屋の周囲の天井
や壁面に取り付けた複数の副マイクロホンと、主マイク
ロホンと副マイクロホンのそれぞれに設けた複数のレベ
ル検出器と、複数の副マイクロホンのレベルから主マイ
クロホンに到達する残響音のレベルを推定する残響レベ
ル推定機能と、この推定残響レベルと主マイクロホンの
レベルとから、減衰器の減衰量を制御する減衰量制御器
とを備えた構成を有している。In order to achieve the above-mentioned object, a sound pickup device of the present invention comprises a main microphone installed in the vicinity of a speaker and an attenuation for attenuating the output of the main microphone and outputting it to the outside. , A plurality of sub microphones mounted on the ceiling or wall around the room away from the speaker, a plurality of level detectors provided for each of the main microphone and the sub microphone, and a main microphone from the level of the plurality of sub microphones. It has a reverberation level estimating function for estimating the level of reverberant sound reaching the sound source, and an attenuation amount controller for controlling the attenuation amount of the attenuator based on the estimated reverberation level and the level of the main microphone. ..
【００１２】また、話者に近接して設置した主マイクロ
ホンと、主マイクロホンの出力を減衰させて外部に出力
する減衰器と、話者から離して設置した複数の副マイク
ロホンと、主マイクロホンと副マイクロホンのそれぞれ
に設けた複数のレベル検出器と、レベル検出器の出力か
ら副マイクロホンの平均レベルを求める平均レベル検出
器と、レベル検出器の出力から副マイクロホンレベルの
分布幅を求める分布幅検出機能と、平均レベルと分布幅
と主マイクロホンのレベルとから、減衰器の減衰量を制
御する減衰量制御器とを備えた構成を有している。Further, a main microphone installed near the speaker, an attenuator for attenuating the output of the main microphone and outputting the result to the outside, a plurality of sub microphones installed apart from the speaker, a main microphone and a sub microphone. A plurality of level detectors provided for each microphone, an average level detector that obtains the average level of the sub microphone from the output of the level detector, and a distribution width detection function that obtains the distribution width of the sub microphone level from the output of the level detector And an attenuation amount controller that controls the attenuation amount of the attenuator based on the average level, the distribution width, and the level of the main microphone.
【００１３】[0013]
【作用】本発明は上記した構成によって、話者からの直
接音が主体の区間と、騒音や残響が主体の区間とを正確
に判別し、この判別結果に基づき出力の利得を調節す
る。According to the present invention, with the above-described structure, the section where the direct sound from the speaker is the main body and the section where the noise or reverberation is the main body are accurately discriminated, and the output gain is adjusted based on the discrimination result.
【００１４】[0014]
【実施例】以下、本発明の一実施例の収音装置につい
て、図面を参照しながら説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS A sound collecting device according to an embodiment of the present invention will be described below with reference to the drawings.
【００１５】（実施例１）図１は本発明の第１の実施例
における収音装置の、マイクロホンの配置図と処理回路
のブロック図を示すものである。図１の実施例は残響除
去性能の優れた収音装置である。図１において、１１は
主マイクロホン、１２は減衰器、１３は主マイクロホン
用のレベル検出器、１４は減衰量制御器、１５ａ〜１５
ｅは副マイクロホン、１６ａ〜１６ｅは副マイクロホン
用のレベル検出器、１７ａ〜１７ｅは重み付け器、１８
は加算器である。(Embodiment 1) FIG. 1 shows a layout of microphones and a block diagram of a processing circuit of a sound collecting device according to a first embodiment of the present invention. The embodiment of FIG. 1 is a sound collecting device having excellent dereverberation performance. In FIG. 1, 11 is a main microphone, 12 is an attenuator, 13 is a level detector for the main microphone, 14 is an attenuation controller, and 15a to 15
e is a sub microphone, 16a to 16e are level detectors for the sub microphone, 17a to 17e are weighters, 18
Is an adder.
【００１６】図１の主マイクロホン１１で収音された信
号は、減衰器１２に導かれると同時にレベル検出器１３
にも導かれる。レベル検出器１３で信号レベルが求めら
れ減衰量制御器１４にその値が入力される。減衰量制御
器１４では、このレベルがあらかじめ定めた しきい値
より小さい場合には騒音であると判断して減衰器１２の
減衰量を大きく制御し、大きい場合には音声であると判
断して減衰量を小さく制御する。ここまでの動作は従来
例とまったく同様である。The signal picked up by the main microphone 11 of FIG. 1 is guided to the attenuator 12 and at the same time the level detector 13
Is also led to. The signal level is obtained by the level detector 13, and the value is input to the attenuation amount controller 14. If the level is smaller than a predetermined threshold value, the attenuation controller 14 determines that the noise is noise and controls the attenuation amount of the attenuator 12 to a large amount. Control the amount of attenuation small. The operation up to this point is exactly the same as the conventional example.
【００１７】部屋の壁や天井に設けた副マイクロホン１
５ａ〜１５ｅで収音した信号は、レベル検出器１６ａ〜
１６ｅでレベルが求められ、重み付け器１７ａ〜１７ｅ
で重み付けされた後、加算器１８で加算される。重み付
けの値は、各副マイクロホンの取り付けられた壁や天井
から、反射音が主マイクロホンへ到達するまでの減衰量
と一致するよう設定されている。この加算器の出力が、
主マイクロホン１１に入力する残響音の推定レベルとな
る。このようにして求めた推定残響レベルは減衰量制御
器１４に入力される。減衰量制御器１４では、この推定
残響レベルと、主マイクロホン用のレベル検出器１３か
ら出力される主マイクロホンレベルとを比較し、両者が
ほとんど等しいときには主マイクロホンに入射した信号
は残響音が主であると判断し、減衰器１２の減衰量を増
加させ、主マイクロホンレベルが大きいときには話者か
らの直接音が主体であると判断し、減衰量を小さく制御
する。Sub microphone 1 provided on the wall or ceiling of the room
The signals picked up by 5a-15e are level detectors 16a-
16e determines the level, and weighters 17a to 17e
After being weighted by, the sum is added by the adder 18. The weighting value is set to match the amount of attenuation from the wall or ceiling to which each sub microphone is attached until the reflected sound reaches the main microphone. The output of this adder is
This is the estimated level of the reverberation sound input to the main microphone 11. The estimated reverberation level thus obtained is input to the attenuation controller 14. The attenuation controller 14 compares the estimated reverberation level with the main microphone level output from the level detector 13 for the main microphone, and when the two are almost equal, the signal incident on the main microphone is mainly reverberant. If it is determined that there is a sound, the attenuation amount of the attenuator 12 is increased, and when the main microphone level is high, it is determined that the direct sound from the speaker is the main, and the attenuation amount is controlled to be small.
【００１８】以上の処理により減衰器１２の出力とし
て、残響信号の抑圧された音質のよい音声信号が得られ
る。By the above processing, the output of the attenuator 12 is a voice signal with good sound quality in which the reverberation signal is suppressed.
【００１９】以上のように本実施例によれば、副マイク
ロホン１５ａ〜１５ｅと、副マイクロホン用のレベル検
出器１６ａ〜１６ｅと、重み付け器１７ａ〜１７ｅと、
加算器１８を備え、加算器１８の出力で減衰器１２の減
衰量を制御しているので、主マイクロホン１１に混入す
る残響音を効果的に抑圧することができる。As described above, according to this embodiment, the sub microphones 15a to 15e, the level detectors 16a to 16e for the sub microphones, the weighting devices 17a to 17e,
Since the adder 18 is provided and the output of the adder 18 controls the attenuation amount of the attenuator 12, the reverberant sound mixed in the main microphone 11 can be effectively suppressed.
【００２０】（実施例２，３）図２、図３は本発明の第
２、第３の実施例における収音装置の、マイクロホンの
配置図と処理回路のブロック図を示すものである。図
２、図３の実施例とも残響除去性能の優れた収音装置で
ある。図２において、２１は遅延器で、他は図１の構成
と同様である。図１の実施例では、反射音が返ってくる
前に残響抑圧動作が働き、このため音声が多少歪むとい
う欠点があるが、図２の実施例では、反射音が返ってく
る時間と遅延器２１の遅延時間とを等しく選び、このよ
うな欠点を無くすことができる。(Embodiments 2 and 3) FIGS. 2 and 3 show a layout of microphones and a block diagram of a processing circuit of a sound collecting device according to second and third embodiments of the present invention. 2 and 3 are sound collecting devices having excellent dereverberation performance. In FIG. 2, reference numeral 21 is a delay device, and the other components are the same as those in FIG. In the embodiment shown in FIG. 1, the dereverberation operation operates before the reflected sound is returned, which causes the voice to be slightly distorted. However, in the embodiment shown in FIG. 2, the time when the reflected sound is returned and the delay unit are delayed. The delay time of 21 can be selected to be equal to eliminate such a defect.
【００２１】図３において、３１ａ〜３１ｅは遅延器
で、他は図１の構成と同様である。図３の実施例では、
各副マイクロホンごとに、反射音が返ってくるまでの時
間を各遅延器３１ａ〜３１ｂにて個別に設定し、より正
確に残響音レベルを推定できるので、さらに音質の劣化
を少なくできる。In FIG. 3, reference numerals 31a to 31e denote delay devices, which are otherwise the same as the configuration of FIG. In the example of FIG.
For each sub-microphone, the delay time for the reflected sound to be returned is individually set by each of the delay devices 31a to 31b, and the reverberation sound level can be estimated more accurately, so that the deterioration of the sound quality can be further reduced.
【００２２】（実施例４）次に本発明の第４の実施例に
ついて図面を参照しながら説明する。図４は本発明の第
４の実施例における収音装置の、マイクロホンの配置図
と処理回路のブロック図を示すものである。図４の実施
例は室外から入射する騒音の除去性能の優れた収音装置
である。図４において、４１は平均レベル算出器、４２
は最大値検出器、４３は最小値検出器、４４は減算器、
４５は減衰量制御器で、他は図１の構成と同様である。(Embodiment 4) Next, a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 4 shows a microphone layout and a block diagram of a processing circuit in a sound collecting device according to a fourth embodiment of the present invention. The embodiment shown in FIG. 4 is a sound collecting device having excellent performance of removing noise incident from the outside. In FIG. 4, 41 is an average level calculator, 42
Is a maximum value detector, 43 is a minimum value detector, 44 is a subtractor,
Reference numeral 45 is an attenuation amount controller, which is otherwise the same as the configuration of FIG.
【００２３】レベル検出器１６ａ〜１６ｅから出力され
た副マイクロホンレベルの値は、平均レベル検出器４１
と、最大値検出器遅延器４２と、最小値検出器４３に入
力される。平均レベル検出器ではこの平均レベルを算出
して減衰量制御器４５に入力する。最大値検出器４２と
最小値検出器４３では、それぞれ最大レベルと最小レベ
ルを求め、減算器４４に入力し、ここでレベルの分布幅
が求められ、減衰量制御器４５に送られる。減衰量制御
器４５では、平均レベルと分布幅とから、音源が室内か
室外のどちらに存在するかを判定する。平均レベルに比
して分布幅が小さいときは音源が室内にあるとみなし、
減衰器１２の減衰量を増加させ、平均レベルに比して分
布幅が大きい時は音源が室内にあると判断し、減衰量を
小さくする。The sub-microphone level values output from the level detectors 16a to 16e are averaged by the average level detector 41.
And the maximum value detector delay device 42 and the minimum value detector 43. The average level detector calculates this average level and inputs it to the attenuation controller 45. The maximum value detector 42 and the minimum value detector 43 determine the maximum level and the minimum level, respectively, and input them to the subtractor 44, where the level distribution width is determined and sent to the attenuation amount controller 45. The attenuation amount controller 45 determines whether the sound source is indoors or outdoors based on the average level and the distribution width. When the distribution width is smaller than the average level, it is considered that the sound source is in the room,
The attenuation amount of the attenuator 12 is increased, and when the distribution width is larger than the average level, it is determined that the sound source is in the room and the attenuation amount is reduced.
【００２４】以上のように本実施例によれば、副マイク
ロホン１５ａ〜１５ｅと、副マイクロホン用のレベル検
出器１６ａ〜１６ｅと、平均レベル検出器４１と、最大
値検出器４２と、最小値検出器４３と、減算器４４と、
減衰量制御器４５を設け、室内の音圧レベルの平均値と
分布幅を測定し、この値で減衰器１２の減衰量を制御し
ているので、室外から混入する騒音を効果的に抑圧する
ことができる。As described above, according to this embodiment, the sub microphones 15a to 15e, the level detectors 16a to 16e for the sub microphones, the average level detector 41, the maximum value detector 42, and the minimum value detection are provided. 43 and subtractor 44,
The attenuation amount controller 45 is provided, the average value and distribution width of the sound pressure level in the room are measured, and the attenuation amount of the attenuator 12 is controlled by this value, so that the noise mixed from the outside is effectively suppressed. be able to.
【００２５】（実施例５）図５は本発明の第５の実施例
における収音装置の、マイクロホンの配置図と処理回路
のブロック図を示すものである。図５の実施例も室外か
らの騒音の除去性能の優れた収音装置である。図５にお
いて、５１ａ〜５１ｅは減算器、５２ａ〜５２ｅは絶対
値変換器、５３は加算器で、他は図４の構成と同様であ
る。図４の実施例では、空調装置などから特定のマイク
ロホンに比較的高レベルの騒音が入力している場合、分
布幅が大きく測定される傾向にあるため、騒音の検出精
度が低下するという欠点がある。図５の実施例では、平
均レベルとの差の絶対値の合計を分布幅として用いてい
るので、このような影響を軽減することができる。(Embodiment 5) FIG. 5 shows a layout of microphones and a block diagram of a processing circuit of a sound collecting device according to a fifth embodiment of the present invention. The embodiment of FIG. 5 is also a sound collecting device having excellent performance of removing noise from the outside. 5, 51a to 51e are subtractors, 52a to 52e are absolute value converters, 53 is an adder, and the other configurations are the same as those in FIG. In the embodiment of FIG. 4, when a relatively high level of noise is input to a specific microphone from an air conditioner or the like, the distribution width tends to be measured large, and thus the noise detection accuracy decreases. is there. In the embodiment of FIG. 5, since the total of the absolute values of the difference from the average level is used as the distribution width, such influence can be reduced.
【００２６】[0026]
【発明の効果】以上の実施例から明らかなように本発明
によれば、主マイクロホンと、減衰器と、複数の副マイ
クロホンと、複数のレベル検出器と、残響レベル推定機
能と、減衰量制御器とを設けてあるので、残響信号を効
果的に抑圧でき、主マイクロホンと話者との距離が比較
的離れた収音状況においても、残響感の少ない聞きやす
い音声信号が収音でき、さらに、主マイクロホンと、減
衰器と、副マイクロホンと、複数のレベル検出器と、平
均レベル検出器と、分布幅検出機能と、減衰量制御器と
を設けてあるので、騒音信号を効果的に抑圧でき、主マ
イクロホンと話者との距離が比較的離れた収音状況にお
いても、騒音の混入の少ない聞きやすい音声信号が収音
できる収音装置が提供できる。As is apparent from the above embodiments, according to the present invention, a main microphone, an attenuator, a plurality of sub microphones, a plurality of level detectors, a reverberation level estimation function, and an attenuation amount control. Since it is equipped with a device, a reverberation signal can be effectively suppressed, and even in a sound collection situation where the distance between the main microphone and the speaker is relatively large, an easy-to-listen audio signal with little reverberation can be collected. , A main microphone, an attenuator, a sub microphone, a plurality of level detectors, an average level detector, a distribution width detection function, and an attenuation controller are provided, so that noise signals are effectively suppressed. Therefore, it is possible to provide a sound pickup device capable of picking up an easy-to-listen audio signal with less noise even in a sound pickup situation where the distance between the main microphone and the speaker is relatively large.
【図１】本発明の第１の実施例の収音装置のマイクロホ
ンの設置状態を示す斜視図と処理回路のブロック図FIG. 1 is a perspective view showing a microphone installation state of a sound collecting device according to a first embodiment of the present invention and a block diagram of a processing circuit.
【図２】本発明の第２の実施例の収音装置のマイクロホ
ンの設置状態を示す斜視図と処理回路のブロック図FIG. 2 is a perspective view showing a microphone installation state of a sound collecting device according to a second embodiment of the present invention and a block diagram of a processing circuit.
【図３】本発明の第３の実施例の収音装置のマイクロホ
ンの設置状態を示す斜視図と処理回路のブロック図FIG. 3 is a perspective view showing a microphone installation state of a sound collecting device according to a third embodiment of the present invention and a block diagram of a processing circuit.
【図４】本発明の第４の実施例の収音装置のマイクロホ
ンの設置状態を示す斜視図と処理回路のブロック図FIG. 4 is a perspective view showing a microphone installed state of a sound collecting device according to a fourth embodiment of the present invention and a block diagram of a processing circuit.
【図５】本発明の第５の実施例の収音装置のマイクロホ
ンの設置状態を示す斜視図と処理回路のブロック図FIG. 5 is a perspective view showing a microphone installation state of a sound collecting device according to a fifth embodiment of the present invention and a block diagram of a processing circuit.
【図６】従来例の収音装置のマイクロホンの設置状態を
示す斜視図と処理回路のブロック図FIG. 6 is a perspective view showing a state in which a microphone of a conventional sound collecting device is installed and a block diagram of a processing circuit.
１１ 主マイクロホン １２ 減衰器 １３ レベル検出器 １４ 減衰量制御器 １５ａ〜１５ｅ 副マイクロホン １６ａ〜１６ｅ レベル検出器 １７ａ〜１７ｅ 重み付け器 １８ 加算器 ２１ 遅延器 ３１ａ〜３１ｅ 遅延器 ４１ 平均レベル検出器 ４２ 最大値検出器 ４３ 最小値検出器 ４４ 減算器 ４５ 減衰量制御器 ５１ａ〜５１ｅ 減算器 ５２ａ〜５２ｅ 絶対値変換器 ５３ 加算器 11 Main Microphone 12 Attenuator 13 Level Detector 14 Attenuation Controller 15a to 15e Sub Microphone 16a to 16e Level Detector 17a to 17e Weighting Device 18 Adder 21 Delay Device 31a to 31e Delay Device 41 Average Level Detector 42 Maximum Value Detector 43 Minimum value detector 44 Subtractor 45 Attenuation controller 51a to 51e Subtractor 52a to 52e Absolute value converter 53 Adder
Claims (5)
と、前記主マイクロホンの出力を減衰させて外部に出力
する減衰器と、話者から離して部屋の周囲の天井や壁面
に取り付けた複数の副マイクロホンと、前記主マイクロ
ホンと前記副マイクロホンのすべてに設けた複数のレベ
ル検出器と、前記副マイクロホンのレベル検出器すべて
に設けた複数の重み付け器と、この重み付け後のレベル
を加算する加算器と、前記加算器の出力と前記主マイク
ロホンのレベル検出器の出力とから前記減衰器の減衰量
を制御する減衰量制御器を備えた収音装置。1. A main microphone installed close to a speaker, an attenuator for attenuating the output of the main microphone and outputting the same to the outside, and a plurality of attenuators mounted on a ceiling or wall around the room away from the speaker. Sub microphone, a plurality of level detectors provided in all of the main microphone and the sub microphone, a plurality of weighting devices provided in all of the level detectors of the sub microphone, and an addition for adding the levels after the weighting. Device, and a sound pickup device including an attenuation amount controller for controlling the attenuation amount of the attenuator from the output of the adder and the output of the level detector of the main microphone.
と、前記主マイクロホンの出力を減衰させて外部に出力
する減衰器と、話者から離して部屋の周囲の天井や壁面
に取り付けた複数の副マイクロホンと、前記主マイクロ
ホンと前記副マイクロホンのすべてに設けた複数のレベ
ル検出器と、前記副マイクロホンのレベル検出器すべて
に設けた複数の重み付け器と、この重み付け後のレベル
を加算する加算器と、前記加算器に接続した遅延器と、
前記遅延器の出力と前記主マイクロホンのレベル検出器
の出力とから前記減衰器の減衰量を制御する減衰量制御
器を備えた収音装置。2. A main microphone installed in the vicinity of a speaker, an attenuator for attenuating the output of the main microphone and outputting it to the outside, and a plurality of attenuators mounted on a ceiling or a wall around a room away from the speaker. Sub microphone, a plurality of level detectors provided in all of the main microphone and the sub microphone, a plurality of weighting devices provided in all of the level detectors of the sub microphone, and an addition for adding the levels after the weighting. And a delay device connected to the adder,
A sound pickup device comprising an attenuation amount controller that controls the attenuation amount of the attenuator from the output of the delay device and the output of the level detector of the main microphone.
と、前記主マイクロホンの出力を減衰させて外部に出力
する減衰器と、話者から離して部屋の周囲の天井や壁面
に取り付けた複数の副マイクロホンと、前記主マイクロ
ホンと前記副マイクロホンのすべてに設けた複数のレベ
ル検出器と、前記副マイクロホンのレベル検出器すべて
に設けた複数の遅延器と、前記遅延器すべてに設けた複
数の重み付け器と、この重み付け後のレベルを加算する
加算器と、前記加算器の出力と前記主マイクロホンのレ
ベル検出器の出力とから前記減衰器の減衰量を制御する
減衰量制御器を備えた収音装置。3. A main microphone installed in the vicinity of a speaker, an attenuator for attenuating the output of the main microphone and outputting the result to the outside, and a plurality of attenuators mounted on the ceiling or wall surface around the room away from the speaker. Sub microphones, a plurality of level detectors provided in all of the main microphone and the sub microphone, a plurality of delay devices provided in all the level detectors of the sub microphone, and a plurality of delay devices provided in all the delay devices. A weighting device, an adder for adding the levels after the weighting, and an attenuation amount controller for controlling the attenuation amount of the attenuator from the output of the adder and the output of the level detector of the main microphone. Sound device.
と、前記主マイクロホンの出力を減衰させて外部に出力
する減衰器と、話者から離して設置した複数の副マイク
ロホンと、前記主マイクロホンと前記副マイクロホンの
すべてに設けた複数のレベル検出器と、前記副マイクロ
ホンの平均レベルを求める平均レベル検出器と、前記複
数の副マイクロホンレベルの最大値を求める最大レベル
検出器と、前記複数の副マイクロホンレベルの最小値を
求める最小レベル検出器と、前記最大レベルと前記最小
レベルとのレベル差を求める減算器と、前記減算器の出
力と前記平均レベル検出器の出力と前記主マイクロホン
のレベル検出器の出力とから、前記減衰器の減衰量を制
御する減衰量制御器を備えた収音装置。4. A main microphone installed near a speaker, an attenuator for attenuating the output of the main microphone and outputting it to the outside, a plurality of sub microphones installed apart from the speaker, and the main microphone. And a plurality of level detectors provided on all of the sub microphones, an average level detector for obtaining an average level of the sub microphones, a maximum level detector for obtaining a maximum value of the plurality of sub microphones, and a plurality of the plurality of level detectors. A minimum level detector for obtaining a minimum value of the sub microphone level, a subtracter for obtaining a level difference between the maximum level and the minimum level, an output of the subtractor, an output of the average level detector and a level of the main microphone. A sound pickup device comprising an attenuation controller for controlling the attenuation of the attenuator based on the output of the detector.
と、前記主マイクロホンの出力を減衰させて外部に出力
する減衰器と、話者から離して設置した複数の副マイク
ロホンと、前記主マイクロホンと前記副マイクロホンの
すべてに設けた複数のレベル検出器と、前記副マイクロ
ホンの平均レベルを求める平均レベル検出器と、前記副
マイクロホンすべてに対応して設けた前記副マイクロホ
ンレベルと前記平均レベルとの差を求める複数の減算器
と、前記減算器の出力の絶対値を求める複数の絶対値変
換器と、前記絶対値を加算する加算器と、前記加算器の
出力と前記平均レベル検出器の出力と前記主マイクロホ
ンのレベル検出器の出力とから、前記減衰器の減衰量を
制御する減衰量制御器を備えた収音装置。5. A main microphone installed near a speaker, an attenuator for attenuating the output of the main microphone and outputting the result to the outside, a plurality of sub-microphones installed apart from the speaker, and the main microphone. And a plurality of level detectors provided in all of the sub microphones, an average level detector for obtaining an average level of the sub microphones, and the sub microphone level and the average level provided corresponding to all the sub microphones. A plurality of subtractors for obtaining a difference, a plurality of absolute value converters for obtaining an absolute value of the output of the subtractor, an adder for adding the absolute values, an output of the adder and an output of the average level detector A sound pickup device comprising an attenuation amount controller for controlling the attenuation amount of the attenuator from the output of the level detector of the main microphone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22388891A JP2822713B2 (en) | 1991-09-04 | 1991-09-04 | Sound pickup device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22388891A JP2822713B2 (en) | 1991-09-04 | 1991-09-04 | Sound pickup device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0564290A true JPH0564290A (en) | 1993-03-12 |
| JP2822713B2 JP2822713B2 (en) | 1998-11-11 |
Family
ID=16805283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22388891A Expired - Fee Related JP2822713B2 (en) | 1991-09-04 | 1991-09-04 | Sound pickup device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2822713B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007235358A (en) * | 2006-02-28 | 2007-09-13 | Nippon Telegr & Teleph Corp <Ntt> | Sound pickup device, program, and recording medium recorded with it |
| JP2011071702A (en) * | 2009-09-25 | 2011-04-07 | Fujitsu Ltd | Sound pickup processor, sound pickup processing method, and program |
| JP2013168857A (en) * | 2012-02-16 | 2013-08-29 | Jvc Kenwood Corp | Noise reduction device, audio input device, radio communication device, and noise reduction method |
| JP2015056676A (en) * | 2013-09-10 | 2015-03-23 | 株式会社リコー | Sound processing device and program |
| US9082415B2 (en) | 2007-01-30 | 2015-07-14 | Fujitsu Limited | Sound determination method and sound determination apparatus |
-
1991
- 1991-09-04 JP JP22388891A patent/JP2822713B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007235358A (en) * | 2006-02-28 | 2007-09-13 | Nippon Telegr & Teleph Corp <Ntt> | Sound pickup device, program, and recording medium recorded with it |
| US9082415B2 (en) | 2007-01-30 | 2015-07-14 | Fujitsu Limited | Sound determination method and sound determination apparatus |
| JP2011071702A (en) * | 2009-09-25 | 2011-04-07 | Fujitsu Ltd | Sound pickup processor, sound pickup processing method, and program |
| JP2013168857A (en) * | 2012-02-16 | 2013-08-29 | Jvc Kenwood Corp | Noise reduction device, audio input device, radio communication device, and noise reduction method |
| JP2015056676A (en) * | 2013-09-10 | 2015-03-23 | 株式会社リコー | Sound processing device and program |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2822713B2 (en) | 1998-11-11 |
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| LAPS | Cancellation because of no payment of annual fees |