JP2004088369A - Hands-free device, hands-free call control method and program - Google Patents
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Abstract
Description
【０００１】
【発明の属する技術分野】
本発明は、ハンズフリー装置、ハンズフリー通話制御方法及びプログラムに関し、特に、受話音声の頭切れを回避することができるハンズフリー装置、ハンズフリー通話制御方法及びプログラムに関する。
【０００２】
【従来の技術】
近年、携帯電話機の普及に伴い、車内等で携帯電話機を手にとることなく、通話可能とするハンズフリー装置が開発されている。
【０００３】
図５は、従来のハンズフリー装置の動作を説明するための信号の波形図で有り、（Ａ）は受話信号、（Ｂ）は送話信号、（Ｃ）は受話音声検出信号、（Ｄ）は送話音声検出信号、（Ｅ）は送受話モードの判定による制御信号を示す。
【０００４】
まず、受話信号が入力されると（Ｂ１）、受話音声検出処理で、音声有りと検出され（Ｂ２）、受話信号がスピーカより出力される。また、マイクから送話信号が入力されると（Ｂ３）、送話音声検出処理で、音声有りと検出される（Ｂ４）。、
スピーカから受話信号が出力されることにより、エコーとして送話信号がマイクに入力される（Ｂ５）。送話音声検出処理では、エコー信号に対して音声有りと検出される（Ｂ６）。
【０００５】
送受話モードの判定処理では、受話信号の入力に対して受話音声有りと検出されるため、受話モードＬに移行（Ｂ７）するが、受話音声が音声有りから音声無しに変化後に、使用者がマイクに発声していないにも係わらず、エコーの入力により送話モードＨに移行する（Ｂ８）。以下、この技術を従来例１という。
【０００６】
また、特開平６−２１６８１１号公報には、ハンズフリー通話用のスピーカからマイクに回り込んだ音響エコー成分を打ち消すためのエコーキャンセラを備え、上記エコーキャンセラ内の受話信号入力部に振幅制限器を設け、この振幅制限器により受話信号の振幅レベルを所定レベル以下に制限するようにした音声通話装置が提案されている。この従来の音声通話装置によれば、信号レベルの大きい受話音声信号が入力されても受話音声に歪みが発生しないようにして、エコーキャンセラで音響エコーを常に十分にキャンセルできるようにし、これにより通話品質のより一層の向上を図ることができる、としている。以下、この技術を従来例２という。
【０００７】
【発明が解決しようとする課題】
従来例１では、エコーの入力により送話モードＨに移行した後（Ｂ８）、受話音声の入力が行われると、受話音声有りを検出して受話モードに移行する（Ｂ９）。しかし、受話のアッテネータでは徐々にモードが切り替わるため、受話音声の頭切れが発生するという課題がある。
【０００８】
従来例２では、エコーキャンセラを新たに設ける必要があるため、部品点数が多くなり構成が複雑になり製造コストがかかる。また、すべてのエコーをキャンセルすることは実際には困難である。
【０００９】
本発明は、上記課題を解決するためになされたもので有り、エコーキャンセラを設けることなく、受話音声の頭切れを回避することができるハンズフリー装置、ハンズフリー通話制御方法及びプログラムを提供することを目的とする。
【００１０】
【課題を解決するための手段】
本発明のハンズフリー装置は、電話機と接続されるコネクタ部と、音声入力部と、音声出力部とを有し、前記音声入力部から入力された送話信号を前記コネクタ部を介して前記電話機に出力し、前記電話機からコネクタ部を介して入力された受話信号を前記音声出力部から出力するハンズフリー装置において、
前記音声入力部からの送話信号に基づいて送話音声の有無を検出する送話音声検出部と、
前記電話機からコネクタ部を介して入力された受話信号に基づいて受話音声の有無を検出する受話音声検出部と、
前記音声入力部とコネクタ部との間に設けられ、受話モード時に前記送話信号のレベルを減衰させる送話アッテネータと、
前記音声出力部とコネクタ部との間に設けられ、送話モード時に前記受話信号のレベルを減衰させる受話アッテネータと、
前記送話音声検出部及び受話音声検出部からの検出信号に基づいて、送話モード及び受話モードを判定し、送話アッテネータ及び受話アッテネータの動作を制御する制御部と、を有し、
前記制御部は、前記送話音声検出部により音声有りと検出され、かつ、受話音声検出部により音声無しと検出された場合、送話モードと判定し、前記受話アッテネータを動作させ、前記送話音声検出部により音声無しと検出され、かつ、受話音声検出部により音声有りと検出された場合、受話モードと判定し、前記送話アッテネータを動作させ、送話音声検出部及び受話音声検出部により共に音声無し又は音声有りと検出された場合、前モードを保持し、
前記受話音声検出部は、音声有りから音声無しへの変化を検出した場合、音声有りと音声無しの検出信号を、所定時間交互に繰り返して出力する、
ことを特徴とするものである。
【００１１】
前記受話音声検出部が音声有りと音声無しの検出信号を交互に繰り返して出力する時間は、前記音声出力部から出力され前記音声入力部に入力されるエコーが発生する時間を考慮して設定されているのが好ましい。
【００１２】
前記送話アッテネータは、受話モードから送話モードに変化する時、送話信号のレベルの減衰量を徐々に減少させ、送話モードから受話モードに変化する時、送話信号のレベルの減衰量を徐々に上昇させ、
前記受話アッテネータは、受話モードから送話モードに変化する時、受話信号のレベルの減衰量を徐々に上昇させ、送話モードから受話モードに変化する時、送話信号のレベルの減衰量を徐々に減少させるのが好ましい。
【００１３】
本発明のハンズフリー通話制御方法は、電話機と接続されるコネクタ部と、音声入力部と、音声出力部と、送話音声検出部と、受話音声検出部と、前記音声入力部とコネクタ部との間に設けられた送話アッテネータと、前記音声出力部とコネクタ部との間に設けられた受話アッテネータとを有し、前記音声入力部から入力された送話信号を前記コネクタ部を介して前記電話機に出力し、前記電話機からコネクタ部を介して入力された受話信号を前記音声出力部から出力するハンズフリー装置によるハンズフリー通話制御方法において、
前記送話音声検出部により前記音声入力部からの送話信号に基づいて送話音声の有無を検出するステップと、
前記受話音声検出部により前記電話機からコネクタ部を介して入力された受話信号に基づいて受話音声の有無を検出するステップと、
前記送話アッテネータにより受話モード時に前記送話信号のレベルを減衰させるステップと、
前記受話アッテネータにより送話モード時に前記受話信号のレベルを減衰させるステップと、
前記送話音声検出部により音声有りと検出され、かつ、受話音声検出部により音声無しと検出された場合、送話モードと判定し、前記受話アッテネータを動作させ、前記送話音声検出部により音声無しと検出され、かつ、受話音声検出部により音声有りと検出された場合、受話モードと判定し、前記送話アッテネータを動作させ、送話音声検出部及び受話音声検出部により共に音声無し又は音声有りと検出された場合、前モードを保持するステップと、
前記受話音声検出部により、音声有りから音声無しへの変化を検出した場合、音声有りと音声無しの検出信号を、所定時間交互に繰り返して出力するステップと、
を有することを特徴とするものである。
【００１４】
前記受話音声検出部が音声有りと音声無しの検出信号を交互に繰り返して出力する時間は、前記音声出力部から出力され前記音声入力部に入力されるエコーが発生する時間を考慮して設定されているのが好ましい。
【００１５】
前記送話アッテネータにより、受話モードから送話モードに変化する時、送話信号のレベルの減衰量を徐々に減少させ、送話モードから受話モードに変化する時、送話信号のレベルの減衰量を徐々に上昇させ、
前記受話アッテネータにより、受話モードから送話モードに変化する時、受話信号のレベルの減衰量を徐々に上昇させ、送話モードから受話モードに変化する時、送話信号のレベルの減衰量を徐々に減少させるのが好ましい。
【００１６】
本発明のプログラムは、電話機と接続されるコネクタ部と、音声入力部と、音声出力部と、送話音声検出部と、受話音声検出部と、前記音声入力部とコネクタ部との間に設けられた送話アッテネータと、前記音声出力部とコネクタ部との間に設けられた受話アッテネータとを有し、前記音声入力部から入力された送話信号を前記コネクタ部を介して前記電話機に出力し、前記電話機からコネクタ部を介して入力された受話信号を前記音声出力部から出力するハンズフリー装置を制御するプログラムにおいて、
前記送話音声検出部により前記音声入力部からの送話信号に基づいて送話音声の有無を検出する処理と、
前記受話音声検出部により前記電話機からコネクタ部を介して入力された受話信号に基づいて受話音声の有無を検出する処理と、
前記送話アッテネータにより受話モード時に前記送話信号のレベルを減衰させる処理と、
前記受話アッテネータにより送話モード時に前記受話信号のレベルを減衰させる処理と、
前記送話音声検出部により音声有りと検出され、かつ、受話音声検出部により音声無しと検出された場合、送話モードと判定し、前記受話アッテネータを動作させ、前記送話音声検出部により音声無しと検出され、かつ、受話音声検出部により音声有りと検出された場合、受話モードと判定し、前記送話アッテネータを動作させ、送話音声検出部及び受話音声検出部により共に音声無し又は音声有りと検出された場合、前モードを保持する処理と、
前記受話音声検出部により、音声有りから音声無しへの変化を検出した場合、音声有りと音声無しの検出信号を、所定時間交互に繰り返して出力する処理と、をコンピュータに実行させることを特徴とするものである。
【００１７】
前記受話音声検出部が音声有りと音声無しの検出信号を交互に繰り返して出力する時間は、前記音声出力部から出力され前記音声入力部に入力されるエコーが発生する時間を考慮して設定されているのが好ましい。
【００１８】
前記送話アッテネータにより、受話モードから送話モードに変化する時、送話信号のレベルの減衰量を徐々に減少させ、送話モードから受話モードに変化する時、送話信号のレベルの減衰量を徐々に上昇させ、
前記受話アッテネータにより、受話モードから送話モードに変化する時、受話信号のレベルの減衰量を徐々に上昇させ、送話モードから受話モードに変化する時、送話信号のレベルの減衰量を徐々に減少させるのが好ましい。
【００１９】
本発明によれば、受話音声検出部が音声有りから音声無しに変化後に、所定時間、音声有りと音声無しの検出信号を交互に繰り返し出力する。そのため、受話音声が音声有りから音声無しに変化したとき、送受話の判定結果が一瞬送話モードに移行するが、受話音声検出結果として一定時間、音声有りと音声無しの検出信号を交互に繰り返し出力するため、本来の動作モードである受話モードに復帰する。
【００２０】
【発明の実施の形態】
以下、本発明の実施の形態について図面を参照して説明する。図１は、本発明の第１の実施形態例に係るハンズフリー装置の構成を示すブロック図である。
【００２１】
図１に示すように、本発明の第１の実施形態例に係るハンズフリー装置Ｆは、携帯電話機１と接続されるコネクタ部２と、音声入力部であるマイク３と、音声出力部であるスピーカ４とを有し、マイク３から入力された送話信号をコネクタ部２を介して携帯電話機１に出力し、携帯電話機１からコネクタ部２を介して入力された受話信号をスピーカ４から出力する。
【００２２】
また、このハンズフリー装置Ｆは、マイク３からの送話信号に基づいて送話音声の有無を検出する送話音声検出部５と、携帯電話機１からコネクタ部２を介して入力された受話信号に基づいて受話音声の有無を検出する受話音声検出部６と、マイク３とコネクタ部２との間に設けられ、受話モード時に送話信号のレベルを減衰させる送話アッテネータ７と、スピーカ４とコネクタ部２との間に設けられ、送話モード時に受話信号のレベルを減衰させる受話アッテネータ８と、送話音声検出部５及び受話音声検出部６からの検出信号に基づいて、送話アッテネータ７及び受話アッテネータ８の動作を制御する制御部９とを有する。
【００２３】
次に、本発明の第１の実施形態例に係るハンズフリー装置Ｆの動作を説明する。
【００２４】
まず、ハンズフリー制御について説明する。携帯電話機１で発着信が行われるとハンズフリー通話に移行する。ハンズフリー通話では、ハウリングを回避するためにボイススイッチ処理を行う。ボイススイッチ処理は、マイク３より入力された送話信号に対して送話音声検出部５で送話音声有無の検出処理を行い、受信信号に対して受話音声検出部６で受話音声有無の検出処理を行う。送受話の音声有無の検出結果をもとに、制御部９で送受話モードの判定処理を行い、送話アッテネータ７と受話アッテネータ８の制御を行う。
【００２５】
次に、音声検出処理について図３を用いて説明する。図３は、本発明の第１の実施形態例に係るハンズフリー装置Ｆの動作を説明するための信号の波形図で有り、（Ａ）は受話信号、（Ｂ）は送話信号、（Ｃ）は受話音声検出信号、（Ｄ）は送話音声検出信号、（Ｅ）は送受話モードの判定による制御信号を示す。
【００２６】
通話を開始するとハンズフリー通話に移行する。ハンズフリー通話では、マイク３より入力された音声が送話信号として入力され（Ａ１）、通話相手の音声は受話信号として入力される（Ａ２，Ａ３）。
【００２７】
また、スピーカ４より出力した受話信号がエコー信号としてエコー時間分遅れ、レベルが若干減衰してマイク３より入力される（Ａ４，Ａ５）。受話音声検出部６では、受話信号に対して音声有無の検出処理を行い、入力信号が音声信号（Ａ２、Ａ３）の時には音声有りと検出する（Ａ６、Ａ８）。また、受話音声検出部６による検出結果が音声有りから音声無しに変化した後に、エコーによる誤検出を回避するために、一定時間、受話音声検出結果として、音声有りと音声無しの検出信号を、所定時間交互に繰り返して出力する（Ａ７、Ａ９）。例えば、車内でハンズフリー通話を行ったときには、車内でのエコー時間を考慮して約４０ｍｓの間、音声有りと音声無しの検出信号を繰り返し出力する。なお、音声有りと音声無しの検出信号を繰り返し出力する時間は、使用する環境などに応じて適宜設定変更できるように構成するのが好ましい。
【００２８】
送話音声検出部５では入力された送話信号に対して音声有無の検出処理を行い、入力信号が音声信号（Ａ１）の時には音声有りと検出する（Ａ１０）。また、スピーカ４より出力した受話信号のエコー信号（Ａ４、Ａ５）についても、送話音声検出部５で音声有りと検出される（Ａ１１、Ａ１２）。
【００２９】
次に、制御部９での送受話モードの判定処理について説明する。制御部９では送話音声検出部５での音声検出結果と受話音声検出部６での音声検出結果の検出信号に基づいて、送受話モードの判定処理を行う。送話音声検出結果が音声有りの時で受話音声検出結果が音声無しの時には送話モードと判定し、送話音声検出結果が音声無しの時で受話音声検出結果が音声有りの時には受話モードと判定する。送受話の音声検出結果が共に音声有りの時と、音声検出結果が共に音声無しの時には、前状態を保持する。
【００３０】
最後に、送受話のアッテネータ制御について説明する。送受話のアッテネータ制御では、ハンズフリー通話によるハウリングを回避するため、送話アッテネータ７、又は受話アッテネータ８でレベルの減衰を行う。また、エコーが送話側で聞こえるのを防止するために、アッテネータの減衰量は急激に変化させずに徐々に変化させる。
【００３１】
図２は、送受話のアッテネータの制御を説明するためのグラフである。図２に示すように、制御部９で受話モードと判定した時には、受話アッテネータ８では受話信号の減衰は行わず、送話アッテネータ７で送話信号のレベルを減衰させる。制御部９で送受話モード判定結果が受話モードから送話モードに切り替わったときには、受話モードから送話モードに移行するために受話アッテネータ８で受話信号のレベルの減衰量を徐々に上昇させ、逆に送話アッテネータ７で送話信号のレベルの減衰量を徐々に減少させていき、送話モードに移行する。
【００３２】
送話モードでは、送話アッテネータ７で送話信号の減衰は行わず、受話アッテネータ８で受話信号のレベルを減衰させる。制御部９で送受話モードの判定結果が、送話モードから受話モードに切り替わったときには、送話モードから受話モードに移行するために、送話アッテネータ７で送話信号のレベルの減衰量を徐々に上昇させ、逆に受話アッテネータ８で受話信号のレベルの減衰量を徐々に減少させていき、受話モードに移行する。また、送受話モード切り替わり時間については、例えば車内でのエコー時間を考慮する場合には約４０ｍｓとする。
【００３３】
本発明の第１の実施形態例によれば、受話音声検出部６が音声有りから音声無しに変化後に、所定時間、音声有りと音声無しの検出信号を交互に繰り返し出力する。そのため、受話音声が音声有りから音声無しに変化したとき、送受話の判定結果が一瞬送話モードに移行するが、受話音声検出結果として一定時間、音声有りと音声無しの検出信号を交互に繰り返し出力するため、本来の動作モードである受話モードに復帰する（Ａ１３）。その結果、エコーの影響により受話音声を発声後に送話モードに移行せずに受話モードを保持することにより、受話音声の頭切れを回避できる。
【００３４】
図４は本発明の第２の実施形態例を示すブロック図である。図４に示すように、本発明の第２の実施の形態は、上記説明されたハンズフリー装置Ｆを制御するプログラム１０に関する。このプログラム１０は、ＦＤ等の磁気ディスク、ＣＤ−ＲＯＭ等の光ディスク、半導体メモリ等のような記録媒体に記録されていてもよく、通信ネットワークを介してダウンロードされるものでもよい。
【００３５】
本発明は、上記実施の形態に限定されることはなく、特許請求の範囲に記載された技術的事項の範囲内において、種々の変更が可能である。
【００３６】
【発明の効果】
本発明によれば、受話音声検出部が音声有りから音声無しに変化後に、所定時間、音声有りと音声無しの検出信号を交互に繰り返し出力する。そのため、受話音声が音声有りから音声無しに変化したとき、送受話の判定結果が一瞬送話モードに移行するが、受話音声検出結果として一定時間、音声有りと音声無しの検出信号を交互に繰り返し出力するため、本来の動作モードである受話モードに復帰する。その結果、エコーの影響により受話音声を発声後に送話モードに移行せずに受話モードを保持することにより、受話音声の頭切れを回避できる。
【図面の簡単な説明】
【図１】本発明の第１の実施形態例に係るハンズフリー装置の構成を示すブロック図である。
【図２】送話アッテネータ及び受話アッテネータの制御を説明するためのグラフである。
【図３】本発明の第１の実施形態例に係るハンズフリー装置の動作を説明するための信号の波形図で有り、（Ａ）は受話信号、（Ｂ）は送話信号、（Ｃ）は受話音声検出信号、（Ｄ）は送話音声検出信号、（Ｅ）は送受話モードの判定による制御信号を示す。
【図４】本発明の第２の実施形態例を示すブロック図である。
【図５】従来のハンズフリー装置の動作を説明するための信号の波形図で有り、（Ａ）は受話信号、（Ｂ）は送話信号、（Ｃ）は受話音声検出信号、（Ｄ）は送話音声検出信号、（Ｅ）は送受話モードの判定による制御信号を示す。
【符号の説明】
１：携帯電話機
２：コネクタ部
３：マイク
４：スピーカ
５：送話音声検出部
６：受話音声検出部
７：送話アッテネータ
８：受話アッテネータ
９：制御部
１０：プログラム[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a hands-free device, a hands-free call control method, and a program, and more particularly, to a hands-free device, a hands-free call control method, and a program capable of avoiding interruption of received voice.
[0002]
[Prior art]
2. Description of the Related Art In recent years, with the spread of mobile phones, hands-free devices have been developed that enable a user to talk without having to pick up the mobile phone in a car or the like.
[0003]
FIGS. 5A and 5B are waveform diagrams of signals for explaining the operation of the conventional hands-free device. FIG. 5A shows a reception signal, FIG. 5B shows a transmission signal, FIG. 5C shows a reception voice detection signal, and FIG. Indicates a transmission voice detection signal, and (E) indicates a control signal based on the determination of the transmission / reception mode.
[0004]
First, when a reception signal is input (B1), it is detected by the reception sound detection processing that there is a sound (B2), and the reception signal is output from the speaker. When a transmission signal is input from the microphone (B3), the transmission voice detection processing detects that there is voice (B4). ,
When the reception signal is output from the speaker, the transmission signal is input to the microphone as an echo (B5). In the transmitted voice detection process, it is detected that voice is present for the echo signal (B6).
[0005]
In the transmission / reception mode determination process, it is detected that there is a received voice in response to the input of the received signal, and the mode is shifted to the receiving mode L (B7). Although the microphone is not uttered, the mode shifts to the transmission mode H due to the input of the echo (B8). Hereinafter, this technique is referred to as Conventional Example 1.
[0006]
Japanese Patent Application Laid-Open No. 6-216811 discloses an echo canceller for canceling an acoustic echo component circulating from a speaker for a hands-free call to a microphone, and an amplitude limiter is provided at a reception signal input unit in the echo canceller. There has been proposed a voice communication device in which the amplitude limiter limits the amplitude level of a received signal to a predetermined level or less. According to this conventional voice communication device, even if a received voice signal having a large signal level is input, the received voice is not distorted, so that the echo canceller can always sufficiently cancel the acoustic echo, and thereby the voice communication can be performed. The company says that it can further improve quality. Hereinafter, this technique is referred to as Conventional Example 2.
[0007]
[Problems to be solved by the invention]
In the first conventional example, after a transition to the transmission mode H by the input of the echo (B8), when the reception voice is input, the presence of the reception voice is detected and the mode is switched to the reception mode (B9). However, since the mode of the receiving attenuator is gradually switched, there is a problem that the head of the received voice is cut off.
[0008]
In the second conventional example, since it is necessary to newly provide an echo canceller, the number of parts is increased, the configuration is complicated, and the manufacturing cost is increased. Also, it is actually difficult to cancel all echoes.
[0009]
The present invention has been made in order to solve the above problems, and provides a hands-free device, a hands-free call control method, and a program that can avoid a break in received voice without providing an echo canceller. With the goal.
[0010]
[Means for Solving the Problems]
The hands-free device of the present invention has a connector unit connected to a telephone, a voice input unit, and a voice output unit, and transmits a transmission signal input from the voice input unit to the telephone via the connector unit. A hands-free device that outputs a reception signal input from the telephone through a connector unit from the audio output unit,
A transmission voice detection unit that detects the presence or absence of a transmission voice based on a transmission signal from the voice input unit,
A received voice detection unit that detects the presence or absence of a received voice based on a received signal input from the telephone via a connector unit,
A transmission attenuator that is provided between the voice input unit and the connector unit and attenuates a level of the transmission signal in a reception mode;
A receiving attenuator that is provided between the audio output unit and the connector unit and attenuates a level of the receiving signal in a transmitting mode;
Based on the detection signal from the transmission voice detection unit and the reception voice detection unit, determine the transmission mode and the reception mode, and a control unit that controls the operation of the transmission attenuator and the reception attenuator,
The control unit, when it is detected by the transmission voice detection unit that there is voice, and when the reception voice detection unit detects that there is no voice, determines the transmission mode, operates the reception attenuator, the transmission When the voice detection unit detects that there is no voice, and when the reception voice detection unit detects that there is voice, the reception mode is determined, the transmission attenuator is operated, and the transmission voice detection unit and the reception voice detection unit detect When both no sound and sound are detected, the previous mode is maintained,
The receiving voice detection unit, when detecting a change from the presence of voice to the absence of voice, outputs a detection signal of presence and absence of voice, alternately and repeatedly for a predetermined time,
It is characterized by the following.
[0011]
The time during which the received voice detection unit alternately and repeatedly outputs the presence / absence detection signal is set in consideration of the time when an echo is output from the voice output unit and input to the voice input unit. Is preferred.
[0012]
The transmission attenuator gradually decreases the attenuation of the level of the transmission signal when changing from the reception mode to the transmission mode, and decreases the level of the transmission signal when changing from the transmission mode to the reception mode. Gradually rise,
The receiving attenuator gradually increases the attenuation of the level of the received signal when changing from the receiving mode to the transmitting mode, and gradually reduces the amount of attenuation of the level of the transmitting signal when changing from the transmitting mode to the receiving mode. It is preferred to reduce to
[0013]
The hands-free call control method of the present invention includes a connector unit connected to a telephone, a voice input unit, a voice output unit, a transmission voice detection unit, a reception voice detection unit, and the voice input unit and the connector unit. And a receiving attenuator provided between the audio output unit and the connector unit, and transmits a transmission signal input from the audio input unit via the connector unit. A hands-free call control method using a hands-free device that outputs to the telephone and outputs a reception signal input from the telephone via a connector unit from the voice output unit,
Detecting the presence or absence of a transmission voice based on the transmission signal from the voice input unit by the transmission voice detection unit;
Detecting the presence or absence of a reception voice based on a reception signal input from the telephone via the connector unit by the reception voice detection unit;
Attenuating the level of the transmission signal in the reception mode by the transmission attenuator,
Attenuating the level of the received signal in the transmitting mode by the receiving attenuator,
When the transmission voice detection unit detects that there is voice, and when the reception voice detection unit detects that there is no voice, it determines the transmission mode, activates the reception attenuator, and outputs the voice by the transmission voice detection unit. If no voice is detected and the received voice detection unit detects that there is voice, the reception mode is determined, the transmission attenuator is operated, and no voice or voice is detected by the transmission voice detection unit and the reception voice detection unit. Holding the previous mode when the presence is detected;
When the received voice detection unit detects a change from the presence of voice to the absence of voice, a detection signal of presence of voice and absence of voice is repeatedly output for a predetermined time, and
Which is characterized by having
[0014]
The time during which the received voice detection unit alternately and repeatedly outputs the presence / absence detection signal is set in consideration of the time when an echo is output from the voice output unit and input to the voice input unit. Is preferred.
[0015]
By the transmission attenuator, when changing from the reception mode to the transmission mode, the attenuation of the level of the transmission signal is gradually reduced, and when changing from the transmission mode to the reception mode, the attenuation of the level of the transmission signal is reduced. Gradually rise,
By the receiving attenuator, when changing from the receiving mode to the transmitting mode, the level of the received signal is gradually increased, and when changing from the transmitting mode to the receiving mode, the level of the transmitted signal is gradually reduced. It is preferred to reduce to
[0016]
The program of the present invention is provided with a connector unit connected to the telephone, a voice input unit, a voice output unit, a transmission voice detection unit, a reception voice detection unit, and the voice input unit and the connector unit. And a receiving attenuator provided between the audio output unit and the connector unit, and outputs a transmission signal input from the audio input unit to the telephone via the connector unit. And a program for controlling a hands-free device that outputs a reception signal input from the telephone through a connector unit from the audio output unit,
A process of detecting the presence or absence of a transmission voice based on the transmission signal from the voice input unit by the transmission voice detection unit;
A process of detecting the presence or absence of a reception voice based on a reception signal input from the telephone via the connector unit by the reception voice detection unit;
Attenuating the level of the transmission signal in the reception mode by the transmission attenuator;
A process of attenuating the level of the reception signal in the transmission mode by the reception attenuator;
When the transmission voice detection unit detects that there is voice, and when the reception voice detection unit detects that there is no voice, it determines the transmission mode, activates the reception attenuator, and outputs the voice by the transmission voice detection unit. If no voice is detected and the received voice detection unit detects that there is voice, the reception mode is determined, the transmission attenuator is operated, and no voice or voice is detected by the transmission voice detection unit and the reception voice detection unit. When the presence is detected, a process of retaining the previous mode;
When the received voice detection unit detects a change from the presence of voice to the absence of voice, a process of alternately and repeatedly outputting a presence / absence detection signal for a predetermined period of time is performed by a computer. Is what you do.
[0017]
The time during which the received voice detection unit alternately and repeatedly outputs the presence / absence detection signal is set in consideration of the time when an echo is output from the voice output unit and input to the voice input unit. Is preferred.
[0018]
By the transmission attenuator, when changing from the reception mode to the transmission mode, the attenuation of the level of the transmission signal is gradually reduced, and when changing from the transmission mode to the reception mode, the attenuation of the level of the transmission signal is reduced. Gradually rise,
By the receiving attenuator, when changing from the receiving mode to the transmitting mode, the level of the received signal is gradually increased, and when changing from the transmitting mode to the receiving mode, the level of the transmitted signal is gradually reduced. It is preferred to reduce to
[0019]
According to the present invention, after the received voice detection unit changes from the presence of voice to the absence of voice, the detection signals of presence of voice and absence of voice are alternately and repeatedly output for a predetermined time. For this reason, when the received voice changes from voiced to voiceless, the result of the transmission / reception determination is momentarily shifted to the voice transmission mode, but the voiced and no voice detection signals are alternately repeated as the received voice detection result for a certain period of time. In order to output, it returns to the receiving mode which is the original operation mode.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a hands-free device according to the first embodiment of the present invention.
[0021]
As shown in FIG. 1, a hands-free device F according to the first embodiment of the present invention includes a connector unit 2 connected to a mobile phone 1, a microphone 3 as an audio input unit, and an audio output unit. And a speaker 4, and outputs a transmission signal input from the microphone 3 to the mobile phone 1 via the connector 2, and outputs a reception signal input from the mobile phone 1 via the connector 2 from the speaker 4. I do.
[0022]
The hands-free device F includes a transmission voice detection unit 5 that detects the presence or absence of a transmission voice based on a transmission signal from the microphone 3, and a reception voice signal input from the mobile phone 1 via the connector unit 2. A receiving voice detecting unit 6 for detecting the presence or absence of a receiving voice based on the voice signal, a transmitting attenuator 7 provided between the microphone 3 and the connector unit 2 for attenuating the level of the transmitting signal in the receiving mode, A receiving attenuator 8 provided between the transmitting unit and the connector unit 2 for attenuating the level of a receiving signal in a transmitting mode, and a transmitting attenuator 7 based on detection signals from the transmitting voice detecting unit 5 and the receiving voice detecting unit 6. And a control unit 9 for controlling the operation of the receiving attenuator 8.
[0023]
Next, the operation of the hands-free device F according to the first embodiment of the present invention will be described.
[0024]
First, the hands-free control will be described. When an outgoing / incoming call is made on the mobile phone 1, the operation shifts to a hands-free call. In a hands-free call, a voice switch process is performed to avoid howling. In the voice switch processing, the transmitted voice detection unit 5 detects the presence or absence of the transmitted voice for the transmitted voice signal input from the microphone 3, and the received voice detection unit 6 detects the presence or absence of the received voice for the received signal. Perform processing. Based on the detection result of the presence or absence of the voice of the transmission / reception, the control unit 9 performs a transmission / reception mode determination process, and controls the transmission attenuator 7 and the reception attenuator 8.
[0025]
Next, the voice detection processing will be described with reference to FIG. 3A and 3B are waveform diagrams of signals for explaining the operation of the hands-free device F according to the first embodiment of the present invention. FIG. 3A is a reception signal, FIG. 3B is a transmission signal, and FIG. ) Indicates a reception voice detection signal, (D) indicates a transmission voice detection signal, and (E) indicates a control signal based on the determination of the transmission / reception mode.
[0026]
When a call is started, it shifts to hands-free call. In a hands-free call, the voice input from the microphone 3 is input as a transmission signal (A1), and the voice of the other party is input as a reception signal (A2, A3).
[0027]
Also, the received signal output from the speaker 4 is delayed as an echo signal by an echo time, and the level is slightly attenuated and input from the microphone 3 (A4, A5). The received voice detection unit 6 detects the presence or absence of voice with respect to the received signal, and detects the presence of voice when the input signal is a voice signal (A2, A3) (A6, A8). Further, after the detection result by the received voice detection unit 6 changes from the presence of voice to the absence of voice, in order to avoid erroneous detection by echo, a detection signal of presence / absence of voice is provided as a reception voice detection result for a predetermined time. Output is repeated alternately for a predetermined time (A7, A9). For example, when a hands-free call is made in a vehicle, detection signals with and without voice are repeatedly output for about 40 ms in consideration of the echo time in the vehicle. It is preferable that the time for repeatedly outputting the detection signals with and without voice be set and changed as appropriate in accordance with the use environment and the like.
[0028]
The transmitted voice detection unit 5 detects the presence or absence of voice for the input transmitted signal, and detects that voice is present when the input signal is a voice signal (A1) (A10). The echo signals (A4, A5) of the reception signal output from the speaker 4 are also detected by the transmission voice detection unit 5 as having voice (A11, A12).
[0029]
Next, the determination process of the transmission / reception mode in the control unit 9 will be described. The control unit 9 performs a transmission / reception mode determination process based on the detection result of the voice detection result of the transmission voice detection unit 5 and the voice detection result of the reception voice detection unit 6. When the transmitted voice detection result is voiced and the received voice detection result is no voice, the mode is determined to be the transmission mode. When the transmitted voice detection result is no voice and the received voice detection result is voiced, the receiving mode is set. judge. The previous state is held when both the voice detection results of the transmission and reception are with voice and when the voice detection results are both without voice.
[0030]
Finally, attenuator control of transmission / reception will be described. In the transmission / reception attenuator control, the transmission attenuator 7 or the reception attenuator 8 attenuates the level in order to avoid howling due to a hands-free call. In addition, in order to prevent the echo from being heard on the transmitting side, the attenuation of the attenuator is changed gradually without abrupt change.
[0031]
FIG. 2 is a graph for explaining control of an attenuator for transmission and reception. As shown in FIG. 2, when the control unit 9 determines that the reception mode is set, the reception attenuator 8 does not attenuate the reception signal, and the transmission attenuator 7 attenuates the level of the transmission signal. When the control unit 9 changes the transmission / reception mode determination result from the reception mode to the transmission mode, the reception attenuator 8 gradually increases the attenuation of the level of the reception signal in order to shift from the reception mode to the transmission mode. Then, the transmission attenuator 7 gradually reduces the attenuation of the level of the transmission signal, and shifts to the transmission mode.
[0032]
In the transmission mode, the transmission signal is not attenuated by the transmission attenuator 7 but the level of the reception signal is attenuated by the reception attenuator 8. When the control unit 9 determines that the transmission / reception mode is switched from the transmission mode to the reception mode, the transmission attenuator 7 gradually reduces the level of the transmission signal level in order to shift from the transmission mode to the reception mode. Then, the receiving attenuator 8 gradually decreases the level of the received signal level, and shifts to the receiving mode. The transmission / reception mode switching time is set to about 40 ms, for example, in consideration of the echo time in the vehicle.
[0033]
According to the first embodiment of the present invention, after the received voice detection unit 6 changes from the presence of voice to the absence of voice, the detection signal of presence and absence of voice is alternately output for a predetermined time. For this reason, when the received voice changes from voiced to voiceless, the result of the transmission / reception determination is momentarily shifted to the voice transmission mode, but the voiced and no voice detection signals are alternately repeated as the received voice detection result for a certain period of time. In order to output, the mode returns to the receiving mode, which is the original operation mode (A13). As a result, it is possible to avoid a break in the received voice by maintaining the receiving mode without shifting to the transmission mode after uttering the received voice due to the influence of the echo.
[0034]
FIG. 4 is a block diagram showing a second embodiment of the present invention. As shown in FIG. 4, the second embodiment of the present invention relates to a
[0035]
The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the technical matters described in the claims.
[0036]
【The invention's effect】
According to the present invention, after the received voice detection unit changes from the presence of voice to the absence of voice, the detection signals of presence of voice and absence of voice are alternately and repeatedly output for a predetermined time. For this reason, when the received voice changes from voiced to voiceless, the result of the transmission / reception determination is momentarily shifted to the voice transmission mode, but the voiced and no voice detection signals are alternately repeated as the received voice detection result for a certain period of time. In order to output, it returns to the receiving mode which is the original operation mode. As a result, it is possible to avoid a break in the received voice by maintaining the receiving mode without shifting to the transmission mode after uttering the received voice due to the influence of the echo.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a hands-free device according to a first embodiment of the present invention.
FIG. 2 is a graph for explaining control of a transmission attenuator and a reception attenuator.
FIGS. 3A and 3B are waveform diagrams of signals for explaining the operation of the hands-free device according to the first embodiment of the present invention, wherein FIG. 3A is a reception signal, FIG. 3B is a transmission signal, and FIG. Indicates a received voice detection signal, (D) indicates a transmitted voice detection signal, and (E) indicates a control signal based on the determination of the transmitted / received mode.
FIG. 4 is a block diagram showing a second embodiment of the present invention.
5A and 5B are waveform diagrams of signals for explaining the operation of the conventional hands-free device, where FIG. 5A is a reception signal, FIG. 5B is a transmission signal, FIG. 5C is a reception voice detection signal, and FIG. Indicates a transmission voice detection signal, and (E) indicates a control signal based on the determination of the transmission / reception mode.
[Explanation of symbols]
1: Mobile phone 2: Connector section 3: Microphone 4: Speaker 5: Transmitted voice detection section 6: Received voice detection section 7: Transmitted attenuator 8: Received attenuator 9: Control section 10: Program
Claims (9)
前記音声入力部からの送話信号に基づいて送話音声の有無を検出する送話音声検出部と、
前記電話機からコネクタ部を介して入力された受話信号に基づいて受話音声の有無を検出する受話音声検出部と、
前記音声入力部とコネクタ部との間に設けられ、受話モード時に前記送話信号のレベルを減衰させる送話アッテネータと、
前記音声出力部とコネクタ部との間に設けられ、送話モード時に前記受話信号のレベルを減衰させる受話アッテネータと、
前記送話音声検出部及び受話音声検出部からの検出信号に基づいて、送話モード及び受話モードを判定し、送話アッテネータ及び受話アッテネータの動作を制御する制御部と、を有し、
前記制御部は、前記送話音声検出部により音声有りと検出され、かつ、受話音声検出部により音声無しと検出された場合、送話モードと判定し、前記受話アッテネータを動作させ、前記送話音声検出部により音声無しと検出され、かつ、受話音声検出部により音声有りと検出された場合、受話モードと判定し、前記送話アッテネータを動作させ、送話音声検出部及び受話音声検出部により共に音声無し又は音声有りと検出された場合、前モードを保持し、
前記受話音声検出部は、音声有りから音声無しへの変化を検出した場合、音声有りと音声無しの検出信号を、所定時間交互に繰り返して出力する、
ことを特徴とするハンズフリー装置。A connector unit connected to a telephone, a voice input unit, and a voice output unit, and output a transmission signal input from the voice input unit to the telephone via the connector unit; In a hands-free device that outputs a reception signal input through a unit from the audio output unit,
A transmission voice detection unit that detects the presence or absence of a transmission voice based on a transmission signal from the voice input unit,
A received voice detection unit that detects the presence or absence of a received voice based on a received signal input from the telephone via a connector unit,
A transmission attenuator that is provided between the voice input unit and the connector unit and attenuates a level of the transmission signal in a reception mode;
A receiving attenuator that is provided between the audio output unit and the connector unit and attenuates a level of the receiving signal in a transmitting mode;
Based on the detection signal from the transmission voice detection unit and the reception voice detection unit, determine the transmission mode and the reception mode, and a control unit that controls the operation of the transmission attenuator and the reception attenuator,
The control unit, when it is detected by the transmission voice detection unit that there is voice, and when the reception voice detection unit detects that there is no voice, determines the transmission mode, operates the reception attenuator, the transmission When the voice detection unit detects that there is no voice, and when the reception voice detection unit detects that there is voice, the reception mode is determined, the transmission attenuator is operated, and the transmission voice detection unit and the reception voice detection unit detect When both no sound and sound are detected, the previous mode is maintained,
The receiving voice detection unit, when detecting a change from the presence of voice to the absence of voice, outputs a detection signal of presence and absence of voice, alternately and repeatedly for a predetermined time,
A hands-free device.
前記受話アッテネータは、受話モードから送話モードに変化する時、受話信号のレベルの減衰量を徐々に上昇させ、送話モードから受話モードに変化する時、送話信号のレベルの減衰量を徐々に減少させる、
ことを特徴とする請求項１又は２に記載のハンズフリー装置。The transmission attenuator gradually decreases the attenuation of the level of the transmission signal when changing from the reception mode to the transmission mode, and decreases the level of the transmission signal when changing from the transmission mode to the reception mode. Gradually rise,
The receiving attenuator gradually increases the amount of attenuation of the received signal when changing from the receiving mode to the transmitting mode, and gradually decreases the amount of attenuation of the transmitting signal when changing from the transmitting mode to the receiving mode. Reduce to
The hands-free device according to claim 1 or 2, wherein:
前記送話音声検出部により前記音声入力部からの送話信号に基づいて送話音声の有無を検出するステップと、
前記受話音声検出部により前記電話機からコネクタ部を介して入力された受話信号に基づいて受話音声の有無を検出するステップと、
前記送話アッテネータにより受話モード時に前記送話信号のレベルを減衰させるステップと、
前記受話アッテネータにより送話モード時に前記受話信号のレベルを減衰させるステップと、
前記送話音声検出部により音声有りと検出され、かつ、受話音声検出部により音声無しと検出された場合、送話モードと判定し、前記受話アッテネータを動作させ、前記送話音声検出部により音声無しと検出され、かつ、受話音声検出部により音声有りと検出された場合、受話モードと判定し、前記送話アッテネータを動作させ、送話音声検出部及び受話音声検出部により共に音声無し又は音声有りと検出された場合、前モードを保持するステップと、
前記受話音声検出部により、音声有りから音声無しへの変化を検出した場合、音声有りと音声無しの検出信号を、所定時間交互に繰り返して出力するステップと、
を有することを特徴とするハンズフリー通話制御方法。A connector unit connected to the telephone, a voice input unit, a voice output unit, a transmission voice detection unit, a reception voice detection unit, and a transmission attenuator provided between the voice input unit and the connector unit; A receiving attenuator provided between the voice output unit and the connector unit, and outputs a transmission signal input from the voice input unit to the telephone through the connector unit, and a connector from the telephone. A hands-free call control method using a hands-free device that outputs a reception signal input through a unit from the voice output unit,
Detecting the presence or absence of a transmission voice based on the transmission signal from the voice input unit by the transmission voice detection unit;
Detecting the presence or absence of a reception voice based on a reception signal input from the telephone via the connector unit by the reception voice detection unit;
Attenuating the level of the transmission signal in the reception mode by the transmission attenuator,
Attenuating the level of the received signal in the transmitting mode by the receiving attenuator,
When the transmission voice detection unit detects that there is voice, and when the reception voice detection unit detects that there is no voice, it determines the transmission mode, activates the reception attenuator, and outputs the voice by the transmission voice detection unit. If no voice is detected and the received voice detection unit detects that there is voice, the reception mode is determined, the transmission attenuator is operated, and no voice or voice is detected by the transmission voice detection unit and the reception voice detection unit. Holding the previous mode when the presence is detected;
When the received voice detection unit detects a change from the presence of voice to the absence of voice, a detection signal of presence of voice and absence of voice is repeatedly output for a predetermined time, and
A hands-free call control method.
前記受話アッテネータにより、受話モードから送話モードに変化する時、受話信号のレベルの減衰量を徐々に上昇させ、送話モードから受話モードに変化する時、送話信号のレベルの減衰量を徐々に減少させる、
ことを特徴とする請求項４又は５に記載のハンズフリー通話制御方法。By the transmission attenuator, when changing from the reception mode to the transmission mode, the attenuation of the level of the transmission signal is gradually reduced, and when changing from the transmission mode to the reception mode, the attenuation of the level of the transmission signal is reduced. Gradually rise,
By the receiving attenuator, when changing from the receiving mode to the transmitting mode, the level of the received signal is gradually increased, and when changing from the transmitting mode to the receiving mode, the level of the transmitting signal is gradually reduced. Reduce to
The hands-free call control method according to claim 4 or 5, wherein:
前記送話音声検出部により前記音声入力部からの送話信号に基づいて送話音声の有無を検出する処理と、
前記受話音声検出部により前記電話機からコネクタ部を介して入力された受話信号に基づいて受話音声の有無を検出する処理と、
前記送話アッテネータにより受話モード時に前記送話信号のレベルを減衰させる処理と、
前記受話アッテネータにより送話モード時に前記受話信号のレベルを減衰させる処理と、
前記送話音声検出部により音声有りと検出され、かつ、受話音声検出部により音声無しと検出された場合、送話モードと判定し、前記受話アッテネータを動作させ、前記送話音声検出部により音声無しと検出され、かつ、受話音声検出部により音声有りと検出された場合、受話モードと判定し、前記送話アッテネータを動作させ、送話音声検出部及び受話音声検出部により共に音声無し又は音声有りと検出された場合、前モードを保持する処理と、
前記受話音声検出部により、音声有りから音声無しへの変化を検出した場合、音声有りと音声無しの検出信号を、所定時間交互に繰り返して出力する処理と、
をコンピュータに実行させることを特徴とするプログラム。A connector unit connected to the telephone, a voice input unit, a voice output unit, a transmission voice detection unit, a reception voice detection unit, and a transmission attenuator provided between the voice input unit and the connector unit; A receiving attenuator provided between the voice output unit and the connector unit, and outputs a transmission signal input from the voice input unit to the telephone through the connector unit, and a connector from the telephone. In a program for controlling a hands-free device that outputs a reception signal input through a unit from the audio output unit,
A process of detecting the presence or absence of a transmission voice based on the transmission signal from the voice input unit by the transmission voice detection unit;
A process of detecting the presence or absence of a reception voice based on a reception signal input from the telephone via the connector unit by the reception voice detection unit;
Attenuating the level of the transmission signal in the reception mode by the transmission attenuator;
A process of attenuating the level of the reception signal in the transmission mode by the reception attenuator;
When the transmission voice detection unit detects that there is voice, and when the reception voice detection unit detects that there is no voice, it determines the transmission mode, activates the reception attenuator, and outputs the voice by the transmission voice detection unit. If no voice is detected and the received voice detection unit detects that there is voice, the reception mode is determined, the transmission attenuator is operated, and no voice or voice is detected by the transmission voice detection unit and the reception voice detection unit. When the presence is detected, a process of retaining the previous mode;
When the received voice detection unit detects a change from the presence of voice to the absence of voice, a process of alternately outputting a detection signal of presence of voice and absence of voice for a predetermined time,
Which causes a computer to execute the program.
前記受話アッテネータにより、受話モードから送話モードに変化する時、受話信号のレベルの減衰量を徐々に上昇させ、送話モードから受話モードに変化する時、送話信号のレベルの減衰量を徐々に減少させる、
ことを特徴とする請求項７又は８に記載のプログラム。By the transmission attenuator, when changing from the reception mode to the transmission mode, the attenuation of the level of the transmission signal is gradually reduced, and when changing from the transmission mode to the reception mode, the attenuation of the level of the transmission signal is reduced. Gradually rise,
By the receiving attenuator, when changing from the receiving mode to the transmitting mode, the level of the received signal is gradually increased, and when changing from the transmitting mode to the receiving mode, the level of the transmitting signal is gradually reduced. Reduce to
The program according to claim 7, wherein:
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| JP2002246021A JP2004088369A (en) | 2002-08-26 | 2002-08-26 | Hands-free device, hands-free call control method and program |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012156584A (en) * | 2011-01-21 | 2012-08-16 | Panasonic Corp | Speech speed conversion telephone call device |
| JP2012156585A (en) * | 2011-01-21 | 2012-08-16 | Panasonic Corp | Telephone device |
| JP2015142170A (en) * | 2014-01-27 | 2015-08-03 | パナソニックＩｐマネジメント株式会社 | Voice switch and communication apparatus and communication system using the same |
-
2002
- 2002-08-26 JP JP2002246021A patent/JP2004088369A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012156584A (en) * | 2011-01-21 | 2012-08-16 | Panasonic Corp | Speech speed conversion telephone call device |
| JP2012156585A (en) * | 2011-01-21 | 2012-08-16 | Panasonic Corp | Telephone device |
| JP2015142170A (en) * | 2014-01-27 | 2015-08-03 | パナソニックＩｐマネジメント株式会社 | Voice switch and communication apparatus and communication system using the same |
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