JP3377220B2 - Speech privacy protection device - Google Patents
Speech privacy protection deviceInfo
- Publication number
- JP3377220B2 JP3377220B2 JP18914391A JP18914391A JP3377220B2 JP 3377220 B2 JP3377220 B2 JP 3377220B2 JP 18914391 A JP18914391 A JP 18914391A JP 18914391 A JP18914391 A JP 18914391A JP 3377220 B2 JP3377220 B2 JP 3377220B2
- Authority
- JP
- Japan
- Prior art keywords
- sound
- occupant
- voice
- signal
- rear seat
- 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
Landscapes
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Telephone Set Structure (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、ＶＩＰ車等の車両の車
室の前席又は後席の一方の乗員の会話が他方の席の乗員
に洩れるのを防ぐのに好適なスピーチプライバシー保護
装置に関する。
【０００２】
【従来の技術】ＶＩＰ車等の車両の車室の後席で複数の
ＶＩＰ（要人）同士が機密性の高い会話をする場合に、
前席の運転者に会話の内容が伝わるのを防ぐ必要があ
る。
【０００３】従来、特定の音のみを消去するために、音
源からの音声を入力し、電気信号に変換するマイクロホ
ンと、このマイクロホンからの電気信号を入力して増幅
し位相反転させる音声調整部と、この音声調整部からの
電気信号を入力し音声に変換し上記音源からの音声の進
行方向へ向けて発信するスピーカとを備えたことを特徴
とする空間音声消去装置が例えば特開平1-270489号公報
により提案されている。
【０００４】しかしながら、上記空間音声消去装置で
は、消去量の評価をせずに消去のための信号の増幅及び
位相反転が行われるため、音声消去の確実性が低く、ま
た、システムの構成の実施化のための具体的な記述がな
いため、会話音声の消去に適用が困難である。
【０００５】
【発明が解決しようとする課題】上述したように、従来
の空間音声消去装置では、ＶＩＰ車等の車両の車室の後
席で複数のＶＩＰ同士が機密性の高い会話をした場合
に、前席の運転者に会話の内容が伝わるのを防止できな
いという問題があった。
【０００６】従って、本発明の目的は、車両の車室の前
席又は後席の一方の乗員の会話が他方の席の乗員に洩れ
るのを防止するのに好適なスピーチプライバシー保護装
置を提供することである。
【０００７】
【課題を解決するための手段】上記目的を達成するため
に、本発明は、車両の車室の後席近傍に配された自動車
電話機の送受話器と、前記送受話器で検出された音声に
基づき前記送受話器を使用している前記後席の乗員から
前記車室の前席の乗員までの音声伝達特性に対して逆位
相のまたは位相が若干ずれた伝達特性の相殺信号を生成
し、該相殺信号に基づき音声を生成する音声生成手段
と、前記前席の乗員近傍に配され前記音声生成手段によ
って生成された音声を出力する発音手段と、前記前席の
乗員近傍に配され前記後席の乗員からからの音声と前記
発音手段からの音との合成音から得られる誤差信号を出
力するセンサと、該センサからの誤差信号を取り込ん
で、前記誤差信号が最小となるように、前記音声生成手
段で生成される前記相殺信号を補正して、前記後席の乗
員から前記前席の乗員に伝達される音声を前記音声生成
手段で生成された音声により相殺またはその明瞭度を低
下させる制御手段とを有することを特徴とするものであ
る。
【０００８】
【作用】後席の乗員が自動車電話機を使用して通話をす
ると、その通話音声は、自動車電話機の送受話器と、前
席の乗員近傍に配されたセンサにより検出される。前席
の乗員近傍に配された発音手段は、音声生成手段が相殺
信号に基いて生成した音声を出力し、その音声はセンサ
に達する。センサは、その音声と通話音声との合成音か
ら得られる誤差信号を検出する。なお、音声生成手段
は、送受話器で検出された音声に基づき、後席の乗員か
ら前席の乗員までの音声伝達特性に対して逆位相のまた
は位相が若干ずれた伝達特性の相殺信号を生成し、該相
殺信号に基づき音声を生成する。制御手段は、センサか
らの誤差信号を取り込んで、この誤差信号が最小となる
ように、音声生成手段で生成される前記相殺信号を補正
する。
【０００９】
【００１０】これにより、後席の乗員から前席の乗員に
伝達される音声が相殺またはその明瞭度が低下し、後席
の乗員同士の会話や自動車電話機を使用した後席の乗員
の通話が前席の運転者に洩れることを防止できる。
【００１１】
【実施例】以下、本発明の実施例を図面を参照して詳細
に説明する。
【００１２】図１は本発明の一実施例のスピーチプライ
バシー保護装置をＶＩＰ車に適用した基本構成図であ
る。この実施例では、後席の例えばヘッドレスト付近に
配され、後席の乗員の音声を検出する第１のセンサとし
ての２個の音声検出用マイクロホン２1，２2と、前席の
乗員（運転者）近傍に配され第２のセンサとしての２個
の誤差検出用マイクロホン９1，９2と、前席の運転者の
例えばヘッドレスト付近に配され発音手段としての２個
（１個でもよい）のスピーカ８1，８2と、該スピーカ８
1，８2から相殺音を発生させて後席の乗員の音声が前席
の運転者に聞こえないように制御する制御手段としての
適応制御回路３とを有する構成である。なお、スピーカ
８1，８2は、カーオーディオ用スピーカと兼用でもよ
い。
【００１３】図２は図１の詳細を示すブロック図であ
る。図２に示すように、本スピーチプライバシー保護装
置の適応制御回路３は、音声検出用マイクロホン２1，
２2により検出された後席の乗員からの音声信号をサン
プリングしてパルス列の基準信号（参照信号）ｘ（ｎ）
とするＡ／Ｄコンバータ４1，４2と、基準信号ｘ（ｎ）
に基いて、後席の乗員から前席の運転者までの音声伝達
特性Ｈに対して逆の伝達特性（擬似逆伝達特性）Ｈ′1
〜Ｈ′4、即ち、同一振幅で逆位相のまたは位相が若干
ずれた特性を付与した相殺信号を生成する制御ブロック
３1〜３4とから成る。
【００１４】この各制御ブロック３1〜３4は、スピーカ
８とマイクロホン９間の音響伝達特性等の諸特性の伝達
関数Ｃｉｊ（ｉ＝１，２、ｊ＝１，２）を有する４個の
ＦＩＲフィルタＦＩＲｉ（ｉ＝１〜８）と、当該制御ブ
ロック毎に設定される擬似逆伝達特性Ｈ′ｉ（ｉ＝１〜
４）を付与する適応デジタルフィルタＡＤＦｉ（ｉ＝１
〜４）と、ＬＭＳアルゴリズムに基づく演算装置を内蔵
する４個の処理部ＬＭＳとから成る。
【００１５】ＦＩＲフィルタＦＩＲｉは、各制御ブロッ
ク３1〜３4合計で８個（ＦＩＲ１〜ＦＩＲ８）設けら
れ、２個のスピーカ８1，８2と２個のマイクロホン
９1，９2の異なる４個の組合せに夫々対応した異なるス
ピーカとマイクロホン間の音響伝搬遅れ等を含む伝達関
数Ｃ11，Ｃ12；Ｃ21，Ｃ22；Ｃ11，Ｃ12；Ｃ21，Ｃ22を
夫々有する。又、各制御ブロック３1〜３4の処理部ＬＭ
Ｓのアルゴリズムとしては例えばS.J.Elliott, P.A.Nel
son等による「A MultipleError LMS Algorithm andIts
Application to the Active Noise Control Soundand V
ibration」（IEEETransactions, ASSP-35, NO.10 Octob
er 1987）に開示されるMultiple Error Filtered-X LMS
アルゴリズムが用いられる。又、上記ＦＩＲフィルタ
ＦＩＲ１〜ＦＩＲ８に格納される伝達関数Ｃｉｊは、ス
ピーカ８とマインロホン９間の音響伝播遅れの他、スピ
ーカ８の特性、マイクロホン９の特性、Ｄ／Ａコンバー
タ６、Ａ／Ｄコンバータ４，１０等各構成要素の特性を
全て含んでいる。
【００１６】制御ブロック３1，３2からの相殺信号は加
算器５1で、制御ブロック３3，３4からの相殺信号は加
算器５2で夫々加算され、各加算値はＤ／Ａコンバータ
６1，６2でアナログ信号に変換され、増幅器７1，７2で
増幅された後各スピーカ８1，８2を駆動し、該スピーカ
８1，８2から相殺音が発生されるようにしている。
【００１７】各マイクロホン９1，９2は、スピーカ
８1，８2からの相殺音を受信し、受信した相殺音信号
は、対応するＡ／Ｄコンバータ１０1，１０2に入力さ
れ、該Ａ／Ｄコンバータ１０1，１０2によりサンプリン
グされたパルス列の誤差信号ε1，ε2として取り出され
る。これら誤差信号ε1，ε2は、各制御ブロック３1〜
３4の処理部ＬＭＳに供給されるものである。また誤差
信号ε1，ε2は、後席の乗員から直接伝播された会話音
声と各スピーカ８1，８2からの相殺音との誤差を示すも
のである。Ｈ1は、スピーカ８1，８2と誤差検出用マイ
クロホン９1，９2間の音声伝達特性を示すものである。
各処理部ＬＭＳは、スピーカ８と誤差検出用マイクロホ
ン９との組合せによる４個の伝達関数Ｃｉｊ（ｉ＝１，
２、ｊ＝１，２）に対応する誤差信号ε1，ε2が最小と
なるように、下記数式によりフィルタＡＤＦ１〜ＡＤＦ
４の逆伝達特性Ｈ′1〜Ｈ′4を変更するものである。
【００１８】ε＝Ｈｘ＋ＣｉｊＨ′ｉｘ
次に本実施例装置の作用を説明する。
【００１９】音声検出用マイクロホン２1，２2により検
出された後席の乗員の音声信号は、適応制御回路３のＡ
／Ｄコンバータ４1，４2に入力され、該Ａ／Ｄコンバー
タ４1，４2によってサンプリングされたパルス列の基準
信号ｘ（ｎ）として制御ブロック３1〜３4に入力され
る。該制御ブロック３1〜３4は、基準信号ｘ（ｎ）に基
いて、後席の乗員から前席の運転者までの音声伝達特性
Ｈ2に対して逆の伝達特性（擬似逆伝達特性）Ｈ′1〜
Ｈ′4、即ち、同一振幅で逆位相のまたは位相が若干ず
れた特性の相殺信号を生成する。制御ブロック３1，３2
からの相殺信号は加算器５1で、制御ブロック３3，３4
からの相殺信号は加算器５2で夫々加算され、各加算値
はＤ／Ａコンバータ６1，６2でアナログ信号に変換さ
れ、増幅器７1，７2で増幅された後各スピーカ８1，８2
を駆動し、該スピーカ８1，８2は相殺音を発生する。各
マイクロホン９1，９2はスピーカ８1，８2からの相殺音
と後席の乗員からの音声を受信し、受信した相殺音と音
声は対応するＡ／Ｄコンバータ１０1，１０2に入力さ
れ、該Ａ／Ｄコンバータ１０1，１０2によりサンプリン
グされｎ個のパルスから成るパルス列の誤差信号ε1，
ε2として取り出される。該誤差信号ε1，ε2は、各制
御ブロック３1〜３4の処理部ＬＭＳに供給される。各処
理部ＬＭＳは、加算誤差信号に応じてスピーカ８と誤差
検出用マイクロホン９との組合せによる４個の伝達関数
Ｃｉｊ（ｉ＝１，２、ｊ＝１，２）に対応する誤差信号
ε1，ε2が最小となるように、フィルタＡＤＦ１〜ＡＤ
Ｆ４の逆伝達特性Ｈ′1〜Ｈ′4を変更する。
【００２０】このような上記実施例によれば、適応制御
回路３の制御に基くスピーカ８からの相殺音により、後
席の乗員の音声が相殺またはその明瞭度が低下されるの
で、後席の乗員同士の会話が前席の運転者に洩れるのを
防げる。
【００２１】図３は図１に示す装置の他の実施例を示す
基本構成図である。図３に示すように、音声検出用マイ
クロホン２1，２2の代わりに自動車用電話機の電話送受
話器１２により後席の乗員の音声を検出し、他は図３と
同様に構成し、適応制御回路１３の制御によりスピーカ
８から相殺音を発生させて後席の乗員の自動車用電話機
による電話音声が前席の運転者に聞こえないように前述
した如く制御するものである。なお、図３に示すよう
に、スピーカ８、誤差検出用マイクロホン９は、１個と
してもよい。
【００２２】このような上記他の実施例によれば、適応
制御回路１３の制御に基くスピーカ８からの相殺音によ
り、後席の乗員の自動車用電話機による電話音声が相殺
またはその明瞭度が低下されるので、後席の乗員の会話
が前席の運転者に洩れるのを防げる。
【００２３】なお、上述した各実施例では、第１センサ
としての音声検出用マイクロホン、発音手段としてのス
ピーカ、及び第２のセンサとしての誤差検出用マイクロ
ホンを夫々２個ずつ使用したいわゆる２入力２出力２点
制御タイプの構成に適した例について説明したが、本発
明はこれに限られず、任意の数の一入力多出力多点制御
タイプや多入力多出力多点制御タイプに適用することが
出来る。また、後席の乗員の会話が前席の乗員に洩れる
のを防ぐ場合について説明したが、逆の場合についても
勿論適用できるものである。
【００２４】
【発明の効果】以上説明したように、本発明によれば、
車両の車室の後席近傍に配された自動車電話機の送受話
器と、前記送受話器で検出された音声に基づき前記送受
話器を使用している前記後席の乗員から前記車室の前席
の乗員までの音声伝達特性に対して逆位相のまたは位相
が若干ずれた伝達特性の相殺信号を生成し、該相殺信号
に基づき音声を生成する音声生成手段と、前記前席の乗
員近傍に配され前記音声生成手段によって生成された音
声を出力する発音手段と、前記前席の乗員近傍に配され
前記後席の乗員からからの音声と前記発音手段からの音
との合成音から得られる誤差信号を出力するセンサと、
該センサからの誤差信号を取り込んで、前記誤差信号が
最小となるように、前記音声生成手段で生成される前記
相殺信号を補正して、前記後席の乗員から前記前席の乗
員に伝達される音声を前記音声生成手段で生成された音
声により相殺またはその明瞭度を低下させる制御手段と
を有することを特徴とする。これにより、車両の車室の
後席の乗員同士の会話や後席の乗員の自動車電話機を使
った通話が前席の乗員に洩れることを防止するのに好適
なスピーチプライバシー保護装置を提供することができ
る。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle for a vehicle such as a VIP car, and a conversation of one of a front seat and a rear seat of a passenger compartment leaks to a passenger of the other seat. The present invention relates to a speech privacy protection device suitable for preventing speech privacy. 2. Description of the Related Art When a plurality of VIPs (key persons) have a highly confidential conversation in the rear seat of a vehicle such as a VIP car,
It is necessary to prevent the contents of the conversation from being transmitted to the driver in the front seat. [0003] Conventionally, in order to eliminate only a specific sound, a microphone that inputs a sound from a sound source and converts it into an electric signal, and a sound adjustment unit that inputs the electric signal from the microphone and amplifies and reverses the phase. Japanese Patent Laid-Open No. 1-270489 discloses a spatial sound elimination device comprising a speaker for inputting an electric signal from the sound adjustment unit, converting the signal into sound, and transmitting the sound in the traveling direction of the sound from the sound source. Has been proposed. [0004] However, in the above spatial sound canceling device, since the signal for canceling and the phase inversion are performed without evaluating the amount of canceling, the reliability of sound canceling is low and the implementation of the system configuration is difficult. Since there is no specific description for the conversion, it is difficult to apply it to the elimination of conversational voice. [0005] As described above, in the conventional spatial sound elimination apparatus, when a plurality of VIPs have a highly confidential conversation in the rear seat of a vehicle such as a VIP car. In addition, there is a problem that it is impossible to prevent the contents of the conversation from being transmitted to the driver in the front seat. Accordingly, an object of the present invention is to provide a speech privacy protection device suitable for preventing a conversation of one occupant of a front seat or a rear seat of a vehicle compartment from leaking to an occupant of the other seat. That is. [0007] To achieve the above object, resolving means for the problems, the present invention includes a handset of an automobile telephone arranged to seat near the rear of the passenger compartment of vehicles, it is detected by the handset And generating a cancellation signal having a transfer characteristic that is in opposite phase or slightly out of phase with respect to the voice transfer characteristic from the rear seat occupant using the handset to the front seat occupant using the handset. A voice generating means for generating a voice based on the canceling signal; a sound generating means arranged near the front seat occupant for outputting the voice generated by the voice generating means; and a sound generating means arranged near the front seat occupant. A sensor for outputting an error signal obtained from a synthesized sound of a sound from the rear seat occupant and a sound from the sound generating means, and an error signal from the sensor is taken in such a manner that the error signal is minimized. Generated by the voice generating means Control means for correcting the offset signal to be canceled and canceling the sound transmitted from the rear seat occupant to the front seat occupant by the sound generated by the sound generating means or reducing its clarity. It is characterized by the following. An occupant in the rear seat makes a call using a car telephone.
Then, the call voice is transmitted to the handset of the car phone,
It is detected by a sensor arranged near the occupant in the seat. Front seat
The sound generation means arranged near the occupant of the
Outputs the sound generated based on the signal, and outputs the sound
Reach Is the sensor a synthesized sound of the voice and the call voice?
The resulting error signal is detected. In addition, voice generation means
Based on the voice detected by the handset,
Of the opposite phase to the sound transmission characteristics from the
Generates a cancellation signal with a transfer characteristic slightly out of phase,
A sound is generated based on the killing signal. The control means is a sensor
Captures these error signals and minimizes this error signal
So that the cancellation signal generated by the voice generation means is corrected
I do. [0010] As a result, the sound transmitted from the rear passenger to the front passenger is offset or the clarity of the sound is reduced, and the conversation between the rear passengers or the rear passenger using the automobile telephone is performed. Can be prevented from being leaked to the driver in the front seat. An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a basic configuration diagram in which a speech privacy protection device according to one embodiment of the present invention is applied to a VIP vehicle. In this embodiment, arranged in the vicinity of, for example, a headrest rear seat, and two voice detection microphone 2 1, 2 2 as a first sensor for detecting the occupant of the voice of the rear seat, passenger front seat (driver (2) two error detection microphones 9 1 and 9 2 arranged in the vicinity as the second sensor and two (one may be provided) as sound generation means arranged near, for example, the headrest of the driver in the front seat. Speakers 8 1 and 8 2 and the speakers 8
1, 8 2 audio occupant of the rear seat by generating a canceling sound has a configuration having an adaptive control circuit 3 as a control means for controlling so as not hear the driver of the front seat. Note that the speakers 8 1 and 8 2 may also be used as car audio speakers. FIG. 2 is a block diagram showing details of FIG. As shown in FIG. 2, the adaptive control circuit 3 of the present speech privacy protection device, voice detection microphone 2 1,
2 2 by the reference signal pulse train by sampling the audio signal from the passenger seat after being detected (reference signal) x (n)
A / D converters 4 1 and 4 2 and a reference signal x (n)
, A transmission characteristic (pseudo reverse transmission characteristic) H ′ 1 opposite to the voice transmission characteristic H from the rear-seat passenger to the front-seat driver.
To H '4, i.e., consists of the control block 3 1 to 3 4 for generating a cancellation signal opposite phase or phases has granted slightly shifted characteristics at the same amplitude. [0014] Each control block 3 1 to 3 4, the transfer of various properties such as acoustic transfer characteristics between the speaker 8 and a microphone 9 function Cij (i = 1,2, j = 1,2) of the four having FIR filter FIRi (i = 1 to 8) and pseudo inverse transfer characteristic H′i (i = 1 to 1) set for each control block
4) An adaptive digital filter ADFi (i = 1)
4), and four processing units LMS incorporating a calculation device based on the LMS algorithm. The FIR filters FIRi are provided in a total of eight (FIR1 to FIR8) in total for each of the control blocks 3 1 to 3 4 , and two different speakers 8 1 and 8 2 and two microphones 9 1 and 9 2 . C21, C22; C11, C12; C21, C22, which include transfer functions C11, C12; C21, C22; The processing unit LM of each control block 3 1 to 3 4
Examples of S algorithms include SJElliott, PANel
`` A MultipleError LMS Algorithm andIts
Application to the Active Noise Control Soundand V
ibration ”(IEEETransactions, ASSP-35, NO.10 Octob
1987) Multiple Error Filtered-X LMS
An algorithm is used. The transfer functions Cij stored in the FIR filters FIR1 to FIR8 are, in addition to the sound propagation delay between the speaker 8 and the main microphone 9, the characteristics of the speaker 8, the characteristics of the microphone 9, the D / A converter 6, and the A / D converter. It includes all the characteristics of each component such as 4,10. [0016] In the control block 3 1, 3 canceling signal from the 2 adder 5 1, the control block 3 3, the canceling signal from the 3 4 are respectively added by adder 5 2, each sum value D / A converter 6 1, 6 2 are converted into analog signals, the amplifier 7 1, 7 2 each speaker 8 1 after being amplified by, 8 2 drives, so the speaker 8 1, 8 2 from the canceling sound is generated ing. Each of the microphones 9 1 and 9 2 receives the canceling sound from the speakers 8 1 and 8 2 , and the received canceling signal is input to the corresponding A / D converters 10 1 and 10 2. These are extracted as error signals ε 1 and ε 2 of the pulse train sampled by the / D converters 10 1 and 10 2 . These error signals epsilon 1, epsilon 2, each control block 3 1 -
3 is intended to be supplied to the fourth processing unit LMS. The error signals ε 1 and ε 2 indicate errors between the conversation sound directly transmitted from the occupant in the rear seat and the canceling sound from each of the speakers 8 1 and 8 2 . H 1 shows a sound transfer characteristics between the speaker 81, 82 and the error detection microphone 9 1, 9 2.
Each processing unit LMS includes four transfer functions Cij (i = 1, 2) based on a combination of the speaker 8 and the error detection microphone 9.
2, j = 1, 2) so that the error signals ε 1 , ε 2 corresponding to the filters ADF1 to ADF1 are minimized by the following equations.
4 to change the reverse transfer characteristics H ′ 1 to H ′ 4 . Ε = Hx + CijH′ix Next, the operation of the present embodiment will be described. The voice signal of the occupant in the rear seat detected by the voice detection microphones 2 1 and 2 2
/ D is input converter 4 1, 4 2, is input to the A / D converter 4 1, 4 control block 3 1 to 3 4 as 2 by the sampling pulse train of the reference signal x (n). The control block 3 1 to 3 4, based on the reference signal x (n), the inverse of the transfer characteristic for voice transfer characteristic of H 2 from the passenger of the rear seat to the driver's front seat (pseudo inverse transfer characteristic) H ' 1 ~
H ′ 4 , that is, a cancellation signal having the same amplitude and opposite phase or slightly shifted in phase. Control block 3 1, 3 2
In cancellation signal adder 5 1 from the control block 3 3, 3 4
Cancellation signal from the respective adder 5 2, each sum value is converted into an analog signal by a D / A converter 6 and 62, the amplifier 7 1, 7 each speaker 8 1 after being amplified by 2, 8 2
And the speakers 8 1 and 8 2 generate a canceling sound. Each of the microphones 9 1 and 9 2 receives the cancellation sound from the speakers 8 1 and 8 2 and the sound from the occupant in the rear seat, and inputs the received cancellation sound and the sound to the corresponding A / D converters 10 1 and 10 2 . And error signals ε 1 , 1 of a pulse train composed of n pulses sampled by the A / D converters 10 1 , 10 2 .
It is taken out as epsilon 2. It said error signal epsilon 1, epsilon 2 is supplied to the processing unit LMS of the control block 3 1 to 3 4. Each processing unit LMS generates an error signal ε 1 corresponding to four transfer functions Cij (i = 1, 2, j = 1, 2) by a combination of the speaker 8 and the error detection microphone 9 according to the addition error signal. , Ε 2 are minimized.
Changing the inverse transfer characteristic H '1 ~H' 4 of F4. According to the above embodiment, the sound of the occupant in the rear seat is canceled or its clarity is reduced by the canceling sound from the speaker 8 based on the control of the adaptive control circuit 3, so that the sound of the rear seat is reduced. This prevents conversation between occupants from leaking to the driver in the front seat. FIG. 3 is a basic configuration diagram showing another embodiment of the apparatus shown in FIG. As shown in FIG. 3, the voice of a rear passenger is detected by a telephone handset 12 of an automobile telephone instead of the voice detection microphones 2 1 and 2 2 , and the other components are configured in the same manner as in FIG. Under the control of the circuit 13, a canceling sound is generated from the speaker 8, and the control is performed as described above so that the telephone sound of the rear passenger on the vehicle telephone cannot be heard by the driver in the front seat. As shown in FIG. 3, the number of speakers 8 and the number of error detection microphones 9 may be one. According to such another embodiment, the canceling sound from the loudspeaker 8 based on the control of the adaptive control circuit 13 cancels out the telephone sound of the rear passenger's car telephone or lowers its clarity. Therefore, the conversation of the rear passenger can be prevented from leaking to the driver in the front seat. In each of the above-described embodiments, a so-called two-input two-phone system using two microphones each as a first sensor, a speaker as a sound generator, and an error detection microphone as a second sensor is used. Although an example suitable for the configuration of the output two-point control type has been described, the present invention is not limited to this, and may be applied to any number of one-input multi-output multi-point control types and multi-input multi-output multi-point control types. I can do it. Also, a case has been described in which the conversation of the rear occupant is prevented from leaking to the front occupant. However, the reverse case can of course be applied. As described above, according to the present invention ,
And handset of an automobile telephone arranged to seat near the rear of the passenger compartment of vehicles, the front seat of the passenger compartment from the passenger of the rear seat using the handset based on the speech detected by the handset Voice generating means for generating a canceling signal having a transfer characteristic that is in phase opposite to or slightly out of phase with respect to the sound transfer characteristic to the occupant, and generating sound based on the canceling signal; A sound generating means for outputting a sound generated by the sound generating means, and an error obtained from a synthesized sound of a sound from the rear seat occupant and a sound from the sound generating means arranged near the front seat occupant. A sensor for outputting a signal,
The error signal from the sensor is taken in, the offset signal generated by the voice generating means is corrected so that the error signal is minimized, and is transmitted from the rear seat occupant to the front seat occupant. And a control unit for canceling the voice generated by the voice generation unit or lowering its clarity. Accordingly, it is possible to provide a speech privacy protection device suitable for preventing conversation between passengers in the rear seat of a vehicle cabin and a call using a car telephone of the rear passenger to be leaked to the front passenger. Can be.
【図面の簡単な説明】
【図１】本発明に係るスピーチプライバシー保護装置の
一実施例を示す基本構成図である。
【図２】図１に示す装置の詳細ブロック図である。
【図３】図１に示す装置の他の実施例を示す基本構成図
である。
【符号の説明】
２1，２2 音声検出用マイクロホン（第１のセンサ）
３ 適応制御回路（制御手段）
８1，８2 スピーカ（発音手段）
９1，９2 誤差検出用マイクロホン（第２のセンサ）BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a basic configuration diagram showing one embodiment of a speech privacy protection device according to the present invention. FIG. 2 is a detailed block diagram of the device shown in FIG. FIG. 3 is a basic configuration diagram showing another embodiment of the apparatus shown in FIG. [Description of Signs] 2 1 , 2 2 Sound detection microphones (first sensor) 3 Adaptive control circuit (control means) 8 1 , 8 2 Speakers (sound generating means) 9 1 , 9 2 Error detection microphones (second Sensor)
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平１−231597（ＪＰ，Ａ) 特開 平３−36897（ＪＰ，Ａ) 特開 平３−53698（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G10K 11/178 B60R 11/02 H04M 1/19 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-1-231597 (JP, A) JP-A-3-36897 (JP, A) JP-A-3-53698 (JP, A) (58) Field (Int.Cl. 7 , DB name) G10K 11/178 B60R 11/02 H04M 1/19
Claims (1)
電話機の送受話器と、前記送受話器で検出された音声に
基づき前記送受話器を使用している前記後席の乗員から
前記車室の前席の乗員までの音声伝達特性に対して逆位
相のまたは位相が若干ずれた伝達特性の相殺信号を生成
し、該相殺信号に基づき音声を生成する音声生成手段
と、前記前席の乗員近傍に配され前記音声生成手段によ
って生成された音声を出力する発音手段と、前記前席の
乗員近傍に配され前記後席の乗員からからの音声と前記
発音手段からの音との合成音から得られる誤差信号を出
力するセンサと、該センサからの誤差信号を取り込ん
で、前記誤差信号が最小となるように、前記音声生成手
段で生成される前記相殺信号を補正して、前記後席の乗
員から前記前席の乗員に伝達される音声を前記音声生成
手段で生成された音声により相殺またはその明瞭度を低
下させる制御手段とを有することを特徴とするスピーチ
プライバシー保護装置。 (57) [Claims] [Claim 1] An automobile arranged near the rear seat of a vehicle compartment
The handset of the telephone and the voice detected by the handset
From the rear seat occupant using the handset based on
Inverse to the sound transmission characteristics to the occupant in the front seat of the cabin
Generates cancellation signals with transfer characteristics that are out of phase or slightly out of phase
Voice generating means for generating voice based on the cancellation signal
And the voice generating means arranged near the occupant in the front seat.
Sounding means for outputting a voice generated by the
The sound from the rear seat occupant arranged near the occupant and the
Outputs an error signal obtained from the synthesized sound with the sound from the sound generator.
Captures the force sensor and the error signal from the sensor
So that the sound generation means is minimized so that the error signal is minimized.
Correcting the cancellation signal generated in the step, the riding of the rear seat
Generates the voice transmitted from the occupant to the front seat occupant.
Canceled or reduced intelligibility by means of generated audio
And a control means for lowering the speech.
Privacy protection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18914391A JP3377220B2 (en) | 1991-07-03 | 1991-07-03 | Speech privacy protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18914391A JP3377220B2 (en) | 1991-07-03 | 1991-07-03 | Speech privacy protection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0511780A JPH0511780A (en) | 1993-01-22 |
| JP3377220B2 true JP3377220B2 (en) | 2003-02-17 |
Family
ID=16236140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18914391A Expired - Fee Related JP3377220B2 (en) | 1991-07-03 | 1991-07-03 | Speech privacy protection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3377220B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016116330A1 (en) | 2015-01-20 | 2016-07-28 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Speech reproduction device configured for masking reproduced speech in a masked speech zone |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5526421A (en) * | 1993-02-16 | 1996-06-11 | Berger; Douglas L. | Voice transmission systems with voice cancellation |
| JP2010019935A (en) * | 2008-07-08 | 2010-01-28 | Toshiba Corp | Device for protecting speech privacy |
| CN103818290A (en) * | 2012-11-16 | 2014-05-28 | 黄金富 | Sound insulating device for use between vehicle driver and boss |
| CN103826176A (en) * | 2012-11-16 | 2014-05-28 | 黄金富 | Driver-specific secret-keeping ear tube used between vehicle driver and passengers |
| JP7248615B2 (en) * | 2020-03-19 | 2023-03-29 | ヤフー株式会社 | Output device, output method and output program |
| CN111613201A (en) * | 2020-06-01 | 2020-09-01 | 大陆泰密克汽车系统（上海）有限公司 | In-vehicle sound management device and method |
| DE102020133648A1 (en) | 2020-12-16 | 2022-06-23 | Audi Aktiengesellschaft | Procedure for securing a voice from being bugged |
| WO2024084854A1 (en) * | 2022-10-17 | 2024-04-25 | パナソニックＩｐマネジメント株式会社 | Sound adjustment method, sound adjustment device, sound adjustment system, and progarm |
-
1991
- 1991-07-03 JP JP18914391A patent/JP3377220B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016116330A1 (en) | 2015-01-20 | 2016-07-28 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Speech reproduction device configured for masking reproduced speech in a masked speech zone |
| KR20170106430A (en) * | 2015-01-20 | 2017-09-20 | 프라운호퍼 게젤샤프트 쭈르 푀르데룽 데어 안겐반텐 포르슝 에. 베. | A speech reproduction device configured to mask speech reproduced in a masked speech zone |
| US10395634B2 (en) | 2015-01-20 | 2019-08-27 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Speech reproduction device configured for masking reproduced speech in a masked speech zone |
| KR102038528B1 (en) * | 2015-01-20 | 2019-10-30 | 프라운호퍼 게젤샤프트 쭈르 푀르데룽 데어 안겐반텐 포르슝 에. 베. | Speech playback device configured to mask speech played in a masked speech zone |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0511780A (en) | 1993-01-22 |
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