JP6855954B2 - Howling prevention device and telephone device - Google Patents

Howling prevention device and telephone device Download PDF

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JP6855954B2
JP6855954B2 JP2017119160A JP2017119160A JP6855954B2 JP 6855954 B2 JP6855954 B2 JP 6855954B2 JP 2017119160 A JP2017119160 A JP 2017119160A JP 2017119160 A JP2017119160 A JP 2017119160A JP 6855954 B2 JP6855954 B2 JP 6855954B2
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佳宏 馬場
佳宏 馬場
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株式会社ナカヨ
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Description

本発明は、ハンズフリー通話におけるハウリング防止技術に関する。 The present invention relates to a howling prevention technique for hands-free calling.

ハンズフリー通話機能を利用した電話装置同士の通話において、一方の電話装置のスピーカから出力された音声が一方の電話装置のマイクに回り込んで他方の電話装置に送られ、さらに他方の電話装置のスピーカから出力された音声が他方の電話装置のマイクに回り込んで一方の電話装置に送られると、これが正帰還となって通話路を伝送する音声信号が増幅され、ハウリングを起こすことがある。 In a call between telephone devices using the hands-free call function, the voice output from the speaker of one telephone device wraps around the microphone of one telephone device and is sent to the other telephone device, and then the other telephone device. When the voice output from the speaker wraps around the microphone of the other telephone device and is sent to the other telephone device, this becomes positive feedback and the voice signal transmitted through the telephone path is amplified, which may cause howling.

特許文献1には、このようなハウリングを抑制することのできるハウリング抑制装置が開示されている。このハウリング抑制装置は、マイクに入力された音声信号の振幅を測定する振幅測定部と、スピーカへ出力される音声信号の振幅を減衰させる振幅減衰部と、マイクに入力された音声信号に基づいてハウリングが発生しているか否かを判定するハウリング判定部と、を備えている。そして、ハウリング判定部によりハウリングが発生していると判定された場合、振幅減衰部により、スピーカへ出力される音声信号の振幅を消音レベルまで減衰させる消音制御を実施する。また、振幅減衰部により消音制御が実施されている状態において、振幅測定部により測定されたマイクに入力された音声信号の振幅が所定のしきい振幅より大きく、かつハウリング判定部によりハウリングが発生していないと判定された場合、振幅減衰部による消音制御を解除する。 Patent Document 1 discloses a howling suppressing device capable of suppressing such howling. This howling suppression device is based on an amplitude measuring unit that measures the amplitude of the voice signal input to the microphone, an amplitude damping unit that attenuates the amplitude of the voice signal output to the speaker, and a voice signal input to the microphone. It is provided with a howling determination unit for determining whether or not howling has occurred. Then, when it is determined by the howling determination unit that howling has occurred, the amplitude attenuation unit performs muffling control for attenuating the amplitude of the voice signal output to the speaker to the muffling level. Further, in a state where the muffling control is performed by the amplitude attenuation unit, the amplitude of the voice signal input to the microphone measured by the amplitude measurement unit is larger than the predetermined threshold amplitude, and howling occurs by the howling determination unit. If it is determined that this is not the case, the muffling control by the amplitude attenuation unit is canceled.

特開2011−114758号公報Japanese Unexamined Patent Publication No. 2011-114758

しかしながら、特許文献1に記載のハウリング抑制装置は、ハウリングが発生していると判定してから消音制御を実施するため、瞬間的にハウリングが発生してしまう。つまり、ハウリングの発生を予防することができない。また、ハウリングが発生しているか否かの判定は、正帰還による音声信号の増幅を検知する必要があり、これを高精度に検知するには複雑な処理が要求され、コストが嵩む。さらに、ハウリングが発生していると判定された場合、消音制御を実施して、スピーカへ出力される音声信号の振幅を消音レベルまで減衰させるので、この間に通話相手が発話しても、その音声信号が消音されて通話相手の発話を聞き取ることができない。 However, since the howling suppression device described in Patent Document 1 performs muffling control after determining that howling has occurred, howling occurs instantaneously. That is, the occurrence of howling cannot be prevented. Further, in order to determine whether or not howling has occurred, it is necessary to detect the amplification of the audio signal due to positive feedback, and in order to detect this with high accuracy, complicated processing is required and the cost increases. Furthermore, when it is determined that howling has occurred, muffling control is performed to reduce the amplitude of the voice signal output to the speaker to the muffling level, so even if the other party speaks during this period, the voice is heard. The signal is muted and the other party's utterance cannot be heard.

本発明は上記事情に鑑みてなされたものであり、本発明の目的は、通話相手との会話を消音することなく効率よくハウリングの発生を予防することにある。 The present invention has been made in view of the above circumstances, and an object of the present invention is to efficiently prevent the occurrence of howling without muting the conversation with the other party.

上記課題を解決するために、本発明では、マイクに入力された音声信号の音量レベルと相手装置から受信した音声信号の音量レベルとの比較結果に基づいて、自装置が送話(話し手)側か、それとも受話(聞き手)側かを判定する。そして、自装置が送話側である判定した場合、相手装置から受信した音声信号の音量レベルを少なくとも消音レベルより大きな所定の音量レベルに下げてからスピーカへ出力する。また、自装置が受話側である判定した場合、マイクに入力された音声信号の音量レベルを少なくとも消音レベルより大きな所定の音量レベルに下げてから相手装置に送信する。 In order to solve the above problems, in the present invention, the own device is on the transmitting (speaker) side based on the comparison result between the volume level of the audio signal input to the microphone and the volume level of the audio signal received from the other device. Determine whether it is the receiving (listener) side. Then, when it is determined that the own device is on the transmitting side, the volume level of the voice signal received from the other device is lowered to at least a predetermined volume level higher than the muffling level, and then the sound signal is output to the speaker. If it is determined that the own device is on the receiving side, the volume level of the audio signal input to the microphone is lowered to a predetermined volume level that is at least higher than the muffling level, and then transmitted to the other device.

例えば、本発明のハウリング防止装置は、
ハンズフリー通話におけるハウリングを防止するハウリング防止装置であって、
マイクに入力された音声信号であるマイク入力信号の音量レベルを測定するマイク入力信号測定手段と、
相手装置から受信した音声信号である受話信号の音量レベルを測定する受話信号測定手段と、
送話信号として前記相手装置に送信する前記マイク入力信号の音量レベルを調整する送話信号調整手段と、
スピーカ出力信号としてスピーカに出力する前記受話信号の音量レベルを調整するスピーカ出力信号調整手段と、
前記マイク入力信号測定手段により測定された前記マイク入力信号の音量レベルと前記受話信号測定手段により測定された前記受話信号の音量レベルとの比較結果に基づいて、自装置が送話側か受話側かを判定する判定手段と、
前記判定手段の判定結果に基づいて、前記送話信号調整手段および前記スピーカ出力信号調整手段を制御する制御手段と、を備え、
前記制御手段は、
前記判定手段により自装置が送話側であると判定された場合に、前記スピーカ出力信号調整手段を制御して、前記スピーカ出力信号の音量レベルを少なくとも消音レベルより大きな所定の第一抑制レベルに下げ、
前記判定手段により自装置が受話側であると判定された場合に、前記送話信号調整手段を制御して、前記送話信号の音量レベルを少なくとも消音レベルより大きな所定の第二抑制レベルに下げ
前記判定手段は、
前記マイク入力信号測定手段により測定された前記マイク入力信号の音量レベルが前記受話信号測定手段により測定された前記受信信号の音量レベルより大きく、かつ所定の第一基準レベル以上である場合に、自装置が送話側であると判定し、
前記受話信号測定手段により測定された前記受信信号の音量レベルが前記マイク入力信号測定手段により測定された前記マイク入力信号の音量レベルより大きく、かつ所定の第二基準レベル以上である場合に、自装置が受話側であると判定する
For example, the howling prevention device of the present invention is
A howling prevention device that prevents howling in hands-free calls.
A microphone input signal measuring means for measuring the volume level of a microphone input signal, which is an audio signal input to a microphone,
A receiving signal measuring means for measuring the volume level of the receiving signal, which is an audio signal received from the other device, and
A transmission signal adjusting means for adjusting the volume level of the microphone input signal transmitted to the other party as a transmission signal, and a transmission signal adjusting means.
A speaker output signal adjusting means for adjusting the volume level of the received signal output to the speaker as a speaker output signal, and a speaker output signal adjusting means.
Based on the comparison result between the volume level of the microphone input signal measured by the microphone input signal measuring means and the volume level of the received signal measured by the received signal measuring means, the own device is the transmitting side or the receiving side. Judgment means to determine whether
Based on the determination result of the determination means, the transmission signal adjusting means and the control means for controlling the speaker output signal adjusting means are provided.
The control means
When the determination means determines that the own device is on the transmitting side, the speaker output signal adjusting means is controlled to set the volume level of the speaker output signal to a predetermined first suppression level that is at least higher than the muffling level. Lower,
When the determination means determines that the own device is on the receiving side, the transmission signal adjusting means is controlled to lower the volume level of the transmission signal to a predetermined second suppression level that is at least higher than the muffling level. ,
The determination means
When the volume level of the microphone input signal measured by the microphone input signal measuring means is larger than the volume level of the received signal measured by the received signal measuring means and is equal to or higher than a predetermined first reference level. Determined that the device is on the transmitting side,
When the volume level of the received signal measured by the received signal measuring means is larger than the volume level of the microphone input signal measured by the microphone input signal measuring means and is equal to or higher than a predetermined second reference level. Determine that the device is on the receiving side .

また、本発明の電話装置は、
ハンズフリー通話機能を有する電話装置であって、
上述のハウリング防止装置を備える。
Further, the telephone device of the present invention is
A telephone device with a hands-free call function
The above-mentioned howling prevention device is provided.

本発明は、自装置が送話(話し手)側か、それとも受話(聞き手)側かに基づいて、スピーカへ出力する音声信号あるいはマイクに入力された音声信号の音量レベルを下げるので、ハウリングの発生を予防することができる。また、自装置が送話側か、それとも受話側かの判定は、マイクに入力された音声信号の音量レベルと相手装置から受信した音声信号の音量レベルとの比較結果に基づいて行われるので、ハウリングが発生しているか否かの判定とは異なり、正帰還による音声信号の増幅を検知する必要がなく、処理を簡素化することができる。さらに、スピーカへ出力する音声信号あるいはマイクに入力された音声信号の音量レベルを少なくとも消音レベルより大きな所定の音量レベルに下げるので、自装置が送話側と判定された場合でも通話相手の発話を聞き取ることができ、また自装置が受話側と判定された場合でも自装置のユーザの発話を通話相手に聞き取らせることができる。したがって、本発明によれば、通話相手との会話を消音することなく効率よくハウリングの発生を予防することができる。 In the present invention, howling occurs because the volume level of the audio signal output to the speaker or the audio signal input to the microphone is lowered based on whether the own device is on the transmitting (speaker) side or the receiving (listener) side. Can be prevented. In addition, whether the own device is the transmitting side or the receiving side is determined based on the comparison result between the volume level of the audio signal input to the microphone and the volume level of the audio signal received from the other device. Unlike the determination of whether or not howling has occurred, it is not necessary to detect the amplification of the audio signal due to positive feedback, and the processing can be simplified. Furthermore, since the volume level of the audio signal output to the speaker or the audio signal input to the microphone is lowered to a predetermined volume level that is at least higher than the mute level, even if the own device is determined to be the transmitting side, the other party's utterance can be heard. It can be heard, and even if the own device is determined to be the receiving side, the other party can hear the utterance of the user of the own device. Therefore, according to the present invention, it is possible to efficiently prevent the occurrence of howling without muting the conversation with the other party.

図1は、本発明の一実施の形態に係る電話装置1の概略構成図である。FIG. 1 is a schematic configuration diagram of a telephone device 1 according to an embodiment of the present invention. 図2は、電話装置1の動作を説明するためのフロー図である。FIG. 2 is a flow chart for explaining the operation of the telephone device 1.

以下に、本発明の一実施の形態について図面を参照して説明する。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

図1は、本実施の形態に係る電話装置1の概略構成図である。 FIG. 1 is a schematic configuration diagram of a telephone device 1 according to the present embodiment.

本実施の形態に係る電話装置1は、ハンズフリー通話機能を備えており、図示するように、通信インターフェース部10と、マンマシンインターフェース部11と、電話機能部12と、マイク入力信号測定部13と、受話信号測定部14と、送話信号調整部15と、スピーカ出力信号調整部16と、判定部17と、制御部18と、を備えている。 The telephone device 1 according to the present embodiment has a hands-free call function, and as shown in the figure, the communication interface unit 10, the man-machine interface unit 11, the telephone function unit 12, and the microphone input signal measurement unit 13 A telephone signal measurement unit 14, a transmission signal adjustment unit 15, a speaker output signal adjustment unit 16, a determination unit 17, and a control unit 18 are provided.

通信インターフェース部10は、公衆電話網、IP電話網、内線電話網等の電話網を介して相手装置と通信を行うためのインターフェースである。 The communication interface unit 10 is an interface for communicating with a remote party device via a telephone network such as a public telephone network, an IP telephone network, or an extension telephone network.

マンマシンインターフェース部11は、ハンズフリー通話したり、情報を表示したり、各種操作を受け付けたりするためのインターフェースであり、ハンズフリー通話用のマイク110およびスピーカ111と、オンフック、オフフック、ダイヤル操作等の各種操作を受け付けるための操作部112と、LCD(Liquid Crystal Display)等の表示部113と、を有する。 The man-machine interface unit 11 is an interface for making hands-free calls, displaying information, and accepting various operations, and includes a microphone 110 and a speaker 111 for hands-free calls, on-hook, off-hook, dial operations, and the like. It has an operation unit 112 for receiving various operations of the above, and a display unit 113 such as an LCD (Liquid Crystal Display).

電話機能部12は、呼制御処理、通話処理等、電話機としての機能を実現するための処理を行う。 The telephone function unit 12 performs processing for realizing a function as a telephone, such as call control processing and call processing.

マイク入力信号測定部13は、マイク110に入力された音声信号であるマイク入力信号の音量レベルを測定する。 The microphone input signal measuring unit 13 measures the volume level of the microphone input signal, which is an audio signal input to the microphone 110.

受話信号測定部14は、電話機能部12が通信インターフェース部10を介して相手装置から受信した音声信号である受話信号の音量レベルを測定する。 The received signal measuring unit 14 measures the volume level of the received signal, which is an audio signal received from the other party device by the telephone function unit 12 via the communication interface unit 10.

送話信号調整部15は、電話機能部12が通信インターフェース部10を介して相手装置に送話信号として送信するマイク入力信号の音量レベルを調整する。 The transmission signal adjustment unit 15 adjusts the volume level of the microphone input signal transmitted by the telephone function unit 12 to the other party device as a transmission signal via the communication interface unit 10.

スピーカ出力信号調整部16は、電話機能部12がスピーカ出力信号としてスピーカ111に出力する受話信号の音量レベルを調整する。 The speaker output signal adjusting unit 16 adjusts the volume level of the received signal output to the speaker 111 as the speaker output signal by the telephone function unit 12.

判定部17は、マイク入力信号測定部13により測定されたマイク入力信号の音量レベルと受話信号測定部14により測定された受話信号の音量レベルとの比較結果に基づいて、自電話装置1が送話側かそれとも受話側かを判定する。 The determination unit 17 is sent by the own telephone device 1 based on a comparison result between the volume level of the microphone input signal measured by the microphone input signal measurement unit 13 and the volume level of the received signal measured by the reception signal measurement unit 14. Determine if it is the speaking side or the receiving side.

そして、制御部18は、判定部17の判定結果に基づいて、送話信号調整部15およびスピーカ出力信号調整部16を制御する。 Then, the control unit 18 controls the transmission signal adjustment unit 15 and the speaker output signal adjustment unit 16 based on the determination result of the determination unit 17.

図2は、電話装置1の動作を説明するためのフロー図である。 FIG. 2 is a flow chart for explaining the operation of the telephone device 1.

このフローは、電話機能部12が通信インターフェース部10を介して相手装置とハンズフリー通話中に実施される。 This flow is carried out during a hands-free call between the telephone function unit 12 and the other party device via the communication interface unit 10.

まず、判定部17は、マイク入力信号測定部13で測定された最新のマイク入力信号の音量レベルを取得するとともに、受話信号測定部14で測定された最新の受話信号の音量レベルを取得する(S100)。 First, the determination unit 17 acquires the volume level of the latest microphone input signal measured by the microphone input signal measurement unit 13, and also acquires the volume level of the latest ear signal measured by the reception signal measurement unit 14 ( S100).

つぎに、判定部17は、マイク入力信号測定部13から取得したマイク入力信号の音量レベルが受話信号測定部14から取得した受話信号の音量レベルより大きいか否かを判断し(S101)、大きいならば(S101でYES)、このマイク入力信号の音量レベルがハウリングを引き起こす可能性がある音量レベルとして予め設定された第一基準レベル以上であるか否かをさらに判断する(S102)。そして、マイク入力信号の音量レベルが第一基準レベル未満であるならば(S102でNO)、S110に進む。一方、マイク入力信号の音量レベルが第一基準レベル以上であるならば(S102でYES)、判定部17は、自電話装置1が送話(話し手)側であると判定し(S103)、この判定結果を制御部18に渡す。 Next, the determination unit 17 determines whether or not the volume level of the microphone input signal acquired from the microphone input signal measurement unit 13 is higher than the volume level of the received signal acquired from the reception signal measurement unit 14 (S101), and is large. If (YES in S101), it is further determined whether or not the volume level of this microphone input signal is equal to or higher than the first reference level preset as the volume level that may cause howling (S102). Then, if the volume level of the microphone input signal is less than the first reference level (NO in S102), the process proceeds to S110. On the other hand, if the volume level of the microphone input signal is equal to or higher than the first reference level (YES in S102), the determination unit 17 determines that the own telephone device 1 is on the transmitting (speaker) side (S103), and this The determination result is passed to the control unit 18.

これを受けて、制御部18は、スピーカ出力信号調整部16を制御して、スピーカ出力信号の音量レベルを、ハウリングを引き起こす可能性のない音量レベルとして予め設定された、少なくとも消音レベルより大きな第一抑制レベルに下げる(S104)。それから、S100に戻る。 In response to this, the control unit 18 controls the speaker output signal adjusting unit 16 to set the volume level of the speaker output signal as a volume level that is set in advance as a volume level that does not cause howling, and is at least larger than the muffling level. It is lowered to one suppression level (S104). Then, return to S100.

一方、マイク入力信号測定部13から取得したマイク入力信号の音量レベルが受話信号測定部14から取得した受話信号の音量レベル以下の場合は(S101でNO)、S105に進む。 On the other hand, if the volume level of the microphone input signal acquired from the microphone input signal measuring unit 13 is equal to or lower than the volume level of the received signal acquired from the receiving signal measuring unit 14 (NO in S101), the process proceeds to S105.

S105において、判定部17は、受話信号測定部14から取得した受話信号の音量レベルがマイク入力信号測定部13から取得したマイク入力信号の音量レベルより大きいか否かを判断し、大きいならば(S105でYES)、この受話信号の音量レベルがハウリングを引き起こす可能性のある音量レベルとして予め設定された第二基準レベル以上であるか否かをさらに判断する(S106)。そして、受話信号の音量レベルが第二基準レベル以上であるならば(S106でYES)、判定部17は、自電話装置1が受話(聞き手)側であると判定し(S107)、この判定結果を制御部18に渡す。 In S105, the determination unit 17 determines whether or not the volume level of the received signal acquired from the received signal measuring unit 14 is higher than the volume level of the microphone input signal acquired from the microphone input signal measuring unit 13, and if it is large ( YES in S105), it is further determined whether or not the volume level of the received signal is equal to or higher than the second reference level preset as the volume level that may cause howling (S106). Then, if the volume level of the received signal is equal to or higher than the second reference level (YES in S106), the determination unit 17 determines that the own telephone device 1 is on the receiving (listener) side (S107), and this determination result. Is passed to the control unit 18.

これを受けて、制御部18は、送話信号調整部15を制御して、送話信号の音量レベルを、ハウリングを引き起こす可能性のない音量レベルとして予め設定された、少なくとも消音レベルより大きな第二抑制レベルに下げる(S108)。それから、S100に戻る。 In response to this, the control unit 18 controls the transmission signal adjustment unit 15 to set the volume level of the transmission signal as a volume level that is set in advance as a volume level that does not cause howling, and is at least larger than the muffling level. (Ii) Lower to the suppression level (S108). Then, return to S100.

一方、受話信号測定部14から取得した受話信号の音量レベルがマイク入力信号測定部13から取得したマイク入力信号の音量レベル以下の場合(S105でNO)、あるいは、マイク入力信号の音量レベルが第二基準レベル未満である場合(S106でNO)、S110に進む。 On the other hand, when the volume level of the received signal acquired from the received signal measuring unit 14 is equal to or lower than the volume level of the microphone input signal acquired from the microphone input signal measuring unit 13 (NO in S105), or the volume level of the microphone input signal is the second. If it is less than the reference level (NO in S106), the process proceeds to S110.

S110において、判定部17は、マイク入力信号測定部13から取得したマイク入力信号の音量レベルが上述の第一基準レベル未満であり、かつ受話信号測定部14から入手した受話信号の音量レベルが上述の第二基準レベル未満であるとの要件を満たすか否かを判断する。そして、この要件を満たさないならば(S110でNO)、S100に戻る。 In S110, in the determination unit 17, the volume level of the microphone input signal acquired from the microphone input signal measurement unit 13 is lower than the above-mentioned first reference level, and the volume level of the received signal obtained from the received signal measuring unit 14 is described above. Judge whether or not the requirement of being below the second standard level of is satisfied. Then, if this requirement is not satisfied (NO in S110), the process returns to S100.

一方、マイク入力信号の音量レベルが第一基準レベル未満であり、かつ受話信号の音量レベルが第二基準レベル未満である場合(S110でYES)、判定部17は、自電話装置1が待機状態であると判定し(S111)、この判定結果を制御部18に渡す。 On the other hand, when the volume level of the microphone input signal is lower than the first reference level and the volume level of the received signal is lower than the second reference level (YES in S110), the determination unit 17 is in the standby state of the own telephone device 1. (S111), and the determination result is passed to the control unit 18.

これを受けて、制御部18は、スピーカ出力信号調整部16にスピーカ出力信号の音量レベルを第一抑制レベルに下げさせるための制御、あるいは送話信号調整部15に送話信号の音量レベルを第二抑制レベルに下げさせるための制御を実施中であるか否かを判断する(S112)。そして、スピーカ出力信号調整部16にスピーカ出力信号の音量レベルを第一抑制レベルに下げさせるための制御、および送話信号調整部15に送話信号の音量レベルを第二抑制レベルに下げさせるための制御のいずれも実施中でないならば(S112でNO)、S100に戻る。 In response to this, the control unit 18 controls the speaker output signal adjustment unit 16 to lower the volume level of the speaker output signal to the first suppression level, or the transmission signal adjustment unit 15 sets the volume level of the transmission signal. It is determined whether or not the control for lowering to the second suppression level is being implemented (S112). Then, in order to control the speaker output signal adjusting unit 16 to lower the volume level of the speaker output signal to the first suppression level, and to cause the transmission signal adjusting unit 15 to lower the volume level of the transmission signal to the second suppression level. If none of the controls in (NO) is being implemented (NO in S112), the process returns to S100.

一方、スピーカ出力信号調整部16にスピーカ出力信号の音量レベルを第一抑制レベルに下げさせるための制御、あるいは送話信号調整部15に送話信号の音量レベルを第二抑制レベルに下げさせるための制御を実施中である場合(S112でYES)、制御部18は、実施中の制御を停止し(S113)、それから、S100に戻る。 On the other hand, in order to control the speaker output signal adjusting unit 16 to lower the volume level of the speaker output signal to the first suppression level, or to cause the transmission signal adjusting unit 15 to lower the volume level of the transmission signal to the second suppression level. When the control of is being executed (YES in S112), the control unit 18 stops the control being executed (S113), and then returns to S100.

以上、本発明の一実施の形態について説明した。 The embodiment of the present invention has been described above.

本実施の形態では、電話装置1が送話(話し手)側か、それとも受話(聞き手)側かに基づいて、スピーカ出力信号あるいは送話信号の音量レベルを下げるので、ハウリングの発生を予防することができる。また、電話装置1が送話側か、それとも受話側かの判定は、マイク入力信号の音量レベルと受話信号の音量レベルとの比較結果に基づいて行われるので、ハウリングが発生しているか否かの判定とは異なり、正帰還による音声信号の増幅を検知する必要がなく、処理を簡素化することができる。さらに、スピーカ出力信号あるいは送話信号の音量レベルを少なくとも消音レベルより大きな音量レベルに下げるので、電話装置1が送話側と判定された場合でも、電話装置1のユーザは、相手装置のユーザの発話を聞き取ることができ、また電話装置1が受話側と判定された場合でも、相手装置に電話装置1のユーザの発話を聞き取らせることができる。したがって、本実施の形態によれば、通話相手との会話を消音することなく効率よくハウリングの発生を予防することができる。 In the present embodiment, the volume level of the speaker output signal or the transmitted signal is lowered based on whether the telephone device 1 is on the transmitting (speaker) side or the receiving (listener) side, so that howling is prevented from occurring. Can be done. Further, since the determination of whether the telephone device 1 is the transmitting side or the receiving side is performed based on the comparison result between the volume level of the microphone input signal and the volume level of the received signal, whether or not howling has occurred. Unlike the determination of, it is not necessary to detect the amplification of the audio signal due to the positive feedback, and the processing can be simplified. Further, since the volume level of the speaker output signal or the utterance signal is lowered to at least a volume level higher than the mute level, even if the telephone device 1 is determined to be the transmitting side, the user of the telephone device 1 is the user of the other device. The utterance can be heard, and even when the telephone device 1 is determined to be the receiving side, the other device can be made to hear the utterance of the user of the telephone device 1. Therefore, according to the present embodiment, it is possible to efficiently prevent the occurrence of howling without muting the conversation with the other party.

また、本実施の形態では、マイク入力信号の音量レベルが、受話信号の音量レベルより大きく、かつ第一基準レベル以上である場合に、電話装置1が送話側であると判定し、受信信号の音量レベルが、マイク入力信号の音量レベルより大きく、かつ第二基準レベル以上である場合に、電話装置1が受話側であると判定している。したがって、ハウリングを引き起こすマイク入力信号の音量レベルおよび受話信号の音量レベルを調査し、その調査結果に基づいて第一基準レベルおよび第二基準レベルを設定することにより、スピーカ出力信号の音量レベルを下げる制御および送話信号の音量レベルを下げる制御の実施頻度を少なくして、より自然な会話を実現することができる。 Further, in the present embodiment, when the volume level of the microphone input signal is higher than the volume level of the received signal and equal to or higher than the first reference level, it is determined that the telephone device 1 is the transmitting side, and the received signal is received. When the volume level of is higher than the volume level of the microphone input signal and is equal to or higher than the second reference level, it is determined that the telephone device 1 is the receiving side. Therefore, the volume level of the speaker output signal is lowered by investigating the volume level of the microphone input signal and the volume level of the received signal that cause howling, and setting the first reference level and the second reference level based on the investigation result. It is possible to realize a more natural conversation by reducing the frequency of performing the control and the control for lowering the volume level of the transmission signal.

また、本実施の形態では、マイク入力信号の音量レベルが第一基準レベルより低く、かつ受信信号の音量レベルが第二基準レベルより低い場合、電話装置1が待機状態であると判定し、スピーカ出力信号の音量レベルを第一抑制レベルに下げる制御、あるいは送話信号の音量レベルを第二抑制レベルに下げる制御を実施中ならば、この制御を停止している。したがって、スピーカ出力信号の音量レベルを下げる制御、あるいは送話信号の音量レベルを下げる制御が不必要に継続することを防止して、より自然な会話を実現することができる。 Further, in the present embodiment, when the volume level of the microphone input signal is lower than the first reference level and the volume level of the received signal is lower than the second reference level, it is determined that the telephone device 1 is in the standby state, and the speaker If the control for lowering the volume level of the output signal to the first suppression level or the control for lowering the volume level of the transmission signal to the second suppression level is being implemented, this control is stopped. Therefore, it is possible to prevent the control of lowering the volume level of the speaker output signal or the control of lowering the volume level of the transmission signal from unnecessarily continuing, and to realize a more natural conversation.

なお、本発明は上記の実施の形態に限定されるものではなく、その要旨の範囲内で数々の変形が可能である。 The present invention is not limited to the above-described embodiment, and many modifications can be made within the scope of the gist thereof.

例えば、上記の実施の形態において、図1に示す電話装置1の機能構成は、ASIC(Application Specific Integrated Circuit)、FPGA(Field Programmable Gate Array)などの集積ロジックICによりハード的に実現されるものでもよいし、あるいはDSP(Digital Signal Processor)などの計算機によりソフトウエア的に実現されるものでもよい。または、CPU、メモリ、HDD、DVD−ROM等の補助記憶装置、および、電話回線インターフェース等を備えたPC(Personal Computer)、スマートフォン等の汎用コンピュータにおいて、CPUが所定のプログラムを補助記憶装置からメモリ上にロードして実行することで実現されるものでもよい。 For example, in the above embodiment, the functional configuration of the telephone device 1 shown in FIG. 1 may be realized by an integrated logic IC such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array). It may be realized by software by a computer such as a DSP (Digital Signal Processor). Alternatively, in an auxiliary storage device such as a CPU, memory, HDD, DVD-ROM, or a general-purpose computer such as a PC (Personal Computer) or a smartphone equipped with a telephone line interface or the like, the CPU stores a predetermined program from the auxiliary storage device. It may be realized by loading it on the top and executing it.

また、上記の実施の形態において、第一基準レベルおよび第二基準レベルは、操作部112を介してユーザが制御部18に設定してもよい。ここで、マイク入力信号および受話信号において、ハウリングを引き起こす可能性のある音量レベルに差異がないならば、第一基準レベルおよび第二基準レベルを共通の基準レベルとしてもよい。 Further, in the above embodiment, the first reference level and the second reference level may be set by the user in the control unit 18 via the operation unit 112. Here, if there is no difference in the volume level that may cause howling in the microphone input signal and the received signal, the first reference level and the second reference level may be used as a common reference level.

同様に、上記の実施の形態において、第一抑制レベルおよび第二抑制レベルは、操作部112を介してユーザが制御部18に設定してもよい。ここで、スピーカ出力信号および送話信号において、ハウリングを引き起こす可能性のない音量レベルに差異がないならば、第一抑制レベルおよび第二抑制レベルを共通の抑制レベルとしてもよい。 Similarly, in the above embodiment, the first suppression level and the second suppression level may be set by the user in the control unit 18 via the operation unit 112. Here, if there is no difference in the volume levels that do not cause howling in the speaker output signal and the transmitted signal, the first suppression level and the second suppression level may be set as a common suppression level.

また、第一基準レベルおよび第一抑制レベルを共通とし、第二基準レベルおよび第二抑制レベルを共通としてもよい。 Further, the first reference level and the first suppression level may be common, and the second reference level and the second suppression level may be common.

また、上記の実施の形態では、本発明のハウリング防止装置を電話装置に内蔵した場合を例にとり説明したが、本発明はこれに限定されない。本発明のハウリング防止装置は、電話装置とは別の装置であってもよい。この場合、マイク入力信号測定部13、受話信号測定部14、送話信号調整部15、スピーカ出力信号調整部16、判定部17、および制御部18を有するハウリング防止装置を、既存の電話装置とハンズフリー用のマイク、スピーカとの間に設置する。具体的には、送話信号調整部15を電話装置のマイク入力端子に接続するとともに、受話信号測定部14を電話装置のスピーカ出力端子に接続する。また、マイク入力信号測定部13をハンズフリー用のマイクに接続するとともに、スピーカ出力信号調整部16をハンズフリー用のスピーカに接続する。 Further, in the above-described embodiment, the case where the howling prevention device of the present invention is built in the telephone device has been described as an example, but the present invention is not limited to this. The howling prevention device of the present invention may be a device different from the telephone device. In this case, the howling prevention device having the microphone input signal measurement unit 13, the reception signal measurement unit 14, the transmission signal adjustment unit 15, the speaker output signal adjustment unit 16, the determination unit 17, and the control unit 18 is combined with the existing telephone device. Install between the hands-free microphone and speaker. Specifically, the transmitted signal adjusting unit 15 is connected to the microphone input terminal of the telephone device, and the received signal measuring unit 14 is connected to the speaker output terminal of the telephone device. Further, the microphone input signal measuring unit 13 is connected to the hands-free microphone, and the speaker output signal adjusting unit 16 is connected to the hands-free speaker.

1:電話装置、 10:通信インターフェース部、 11:マンマシンインターフェース部、 12:電話機能部、 13:マイク入力信号測定部、 14:受話信号測定部、 15:送話信号調整部、 16:スピーカ出力信号調整部、 17:判定部、 18:制御部、 110:マイク、 111:スピーカ、 112:操作部、 113:表示部
1: Telephone device, 10: Communication interface unit, 11: Man-machine interface unit, 12: Telephone function unit, 13: Microphone input signal measurement unit, 14: Receive signal measurement unit, 15: Transmission signal adjustment unit, 16: Speaker Output signal adjustment unit, 17: Judgment unit, 18: Control unit, 110: Microphone, 111: Speaker, 112: Operation unit, 113: Display unit

Claims (3)

ハンズフリー通話におけるハウリングを防止するハウリング防止装置であって、
マイクに入力された音声信号であるマイク入力信号の音量レベルを測定するマイク入力信号測定手段と、
相手装置から受信した音声信号である受話信号の音量レベルを測定する受話信号測定手段と、
送話信号として前記相手装置に送信する前記マイク入力信号の音量レベルを調整する送話信号調整手段と、
スピーカ出力信号としてスピーカに出力する前記受話信号の音量レベルを調整するスピーカ出力信号調整手段と、
前記マイク入力信号測定手段により測定された前記マイク入力信号の音量レベルと前記受話信号測定手段により測定された前記受話信号の音量レベルとの比較結果に基づいて、自装置が送話側か受話側かを判定する判定手段と、
前記判定手段の判定結果に基づいて、前記送話信号調整手段および前記スピーカ出力信号調整手段を制御する制御手段と、を備え、
前記制御手段は、
前記判定手段により自装置が送話側であると判定された場合に、前記スピーカ出力信号調整手段を制御して、前記スピーカ出力信号の音量レベルを少なくとも消音レベルより大きな所定の第一抑制レベルに下げ、
前記判定手段により自装置が受話側であると判定された場合に、前記送話信号調整手段を制御して、前記送話信号の音量レベルを少なくとも消音レベルより大きな所定の第二抑制レベルに下げ、
前記判定手段は、
前記マイク入力信号測定手段により測定された前記マイク入力信号の音量レベルが前記受話信号測定手段により測定された前記受信信号の音量レベルより大きく、かつ所定の第一基準レベル以上である場合に、自装置が送話側であると判定し、
前記受話信号測定手段により測定された前記受信信号の音量レベルが前記マイク入力信号測定手段により測定された前記マイク入力信号の音量レベルより大きく、かつ所定の第二基準レベル以上である場合に、自装置が受話側であると判定する
ことを特徴とするハウリング防止装置。
A howling prevention device that prevents howling in hands-free calls.
A microphone input signal measuring means for measuring the volume level of a microphone input signal, which is an audio signal input to a microphone,
A receiving signal measuring means for measuring the volume level of the receiving signal, which is an audio signal received from the other device, and
A transmission signal adjusting means for adjusting the volume level of the microphone input signal transmitted to the other party as a transmission signal, and a transmission signal adjusting means.
A speaker output signal adjusting means for adjusting the volume level of the received signal output to the speaker as a speaker output signal, and a speaker output signal adjusting means.
Based on the comparison result between the volume level of the microphone input signal measured by the microphone input signal measuring means and the volume level of the received signal measured by the received signal measuring means, the own device is the transmitting side or the receiving side. Judgment means to determine whether
Based on the determination result of the determination means, the transmission signal adjusting means and the control means for controlling the speaker output signal adjusting means are provided.
The control means
When the determination means determines that the own device is on the transmitting side, the speaker output signal adjusting means is controlled to set the volume level of the speaker output signal to a predetermined first suppression level that is at least higher than the muffling level. Lower,
When the determination means determines that the own device is on the receiving side, the transmission signal adjusting means is controlled to lower the volume level of the transmission signal to a predetermined second suppression level that is at least higher than the muffling level. ,
The determination means
When the volume level of the microphone input signal measured by the microphone input signal measuring means is larger than the volume level of the received signal measured by the received signal measuring means and is equal to or higher than a predetermined first reference level. Determined that the device is on the transmitting side,
When the volume level of the received signal measured by the received signal measuring means is larger than the volume level of the microphone input signal measured by the microphone input signal measuring means and is equal to or higher than a predetermined second reference level. A howling prevention device characterized in that the device is determined to be the receiving side.
請求項に記載のハウリング防止装置であって、
前記判定手段は、
前記マイク入力信号測定手段により測定された前記マイク入力信号の音量レベルが前記第一基準レベルより低く、かつ前記受話信号測定手段により測定された前記受信信号の音量レベルが前記第二基準レベルより低い場合、待機状態であると判定し、
前記制御手段は、
前記判定手段により待機状態であると判定された場合に、前記スピーカ出力信号調整手段に前記スピーカ出力信号の音量レベルを減衰させるための制御、あるいは前記送話信号調整手段に前記送話信号の音量レベルを減衰させるための制御を実施中ならば、当該制御を停止する
ことを特徴とするハウリング防止装置。
The howling prevention device according to claim 1.
The determination means
The volume level of the microphone input signal measured by the microphone input signal measuring means is lower than the first reference level, and the volume level of the received signal measured by the received signal measuring means is lower than the second reference level. If, it is determined that it is in a standby state,
The control means
When the determination means determines that the speaker output signal is in the standby state, the speaker output signal adjusting means controls the volume level of the speaker output signal, or the transmitting signal adjusting means controls the volume of the transmitting signal. A howling prevention device characterized in that if a control for attenuating a level is being performed, the control is stopped.
ハンズフリー通話機能を有する電話装置であって、
請求項1または2に記載のハウリング防止装置を備える
ことを特徴とする電話装置。
A telephone device with a hands-free call function
A telephone device comprising the howling prevention device according to claim 1 or 2.
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