JPH05191491A - Hands-free telephone set with private conversation mode - Google Patents
Hands-free telephone set with private conversation modeInfo
- Publication number
- JPH05191491A JPH05191491A JP4005642A JP564292A JPH05191491A JP H05191491 A JPH05191491 A JP H05191491A JP 4005642 A JP4005642 A JP 4005642A JP 564292 A JP564292 A JP 564292A JP H05191491 A JPH05191491 A JP H05191491A
- Authority
- JP
- Japan
- Prior art keywords
- hands
- points
- free telephone
- bgm
- microphone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Telephone Set Structure (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はハンズフリー電話機を用
いて通話交信する場合の漏話、特に送話者の発声が盗み
聴きされるのを阻止した秘話モード付きハンズフリー電
話装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crosstalk when a call is communicated using a handsfree telephone, and more particularly, to a handsfree telephone device with a secret mode which prevents a speaker's voice from being eavesdropped.
【０００２】[0002]
【従来の技術】送話者が電話機のハンドセット（送受話
器）を手で取上げてオフフック状態として、送受話器を
耳と口に近接させて通話交信に入るので、余程大声でな
い限り話声が近辺外界へ伝播して第三者によって、通話
を聴取されることが少ないが、最近普及しつつあるマイ
クロホン及びスピーカを具備したハンズフリー電話機か
らマイクロホンの集音可能範囲の離間地点で、しかもス
ピーカからの放音波到達距離内の離間位置で発声並びに
聴取するのが一般的である。2. Description of the Related Art A talker picks up a handset (handset) of a telephone by hand, puts the handset in an off-hook state, puts the handset in close proximity to his / her mouth and enters a call communication. Although it is rare that a call is heard by a third party after being propagated to the outside world, it is a distance from a hands-free telephone equipped with a microphone and a speaker, which has recently become widespread, and a range in which the microphone can collect sound, and a call from the speaker. It is common to speak and listen at distant positions within the acoustic wave reaching distance.
【０００３】[0003]
【従来技術の課題】従って通話者がハンズフリー電話機
の設置定点近辺で、マイクロホンの集音可能範囲内の、
しかもスピーカからの放音到達距離内の離隔位置で、発
声及び聴取する際、マイクロホンへ向かっての話し声や
スピーカからの放音声が第三者に否応なくまる聞こえに
なるといった漏話障害が生じ、極めて不都合であった。2. Description of the Related Art Therefore, when a caller is near a fixed point of setting up a hands-free telephone and within a sound collection range of a microphone,
Moreover, when speaking or listening at a distance position within the reach of the sound emitted from the speaker, a crosstalk disorder occurs such that the voice spoken to the microphone or the sound emitted from the speaker becomes unavoidably heard by a third party. It was inconvenient.
【０００４】[0004]
【課題を解決するための手段】従来問題となっているハ
ンズフリー電話機の通話交信時の漏話を阻止するため
に、本発明においては電話装置の周囲にＢＧＭを放音す
ることにより、通話者の周囲の第三者に通話内容を聞き
取り難くして秘話性を高めることにあり、上記通話者と
電話装置の２地点を夫々取囲むように設置された３地点
のＢＧＭ音源から放音される音声信号の振幅、位相を調
整することによって、通話者とハンズフリー電話機用マ
イクロホンの定位置２点間夫々に能動消音を生ぜしめ、
通話者自身にはその会話がＢＧＭ音源からの放音で妨害
を受けないようにすることを特徴としている。In order to prevent the crosstalk at the time of call communication of a hands-free telephone, which has been a problem in the related art, in the present invention, a BGM is emitted around the telephone device, so that The sound emitted from BGM sound sources at three points installed so as to surround the two points of the above-mentioned caller and telephone device, respectively, in order to make it difficult to hear the contents of the call from the surrounding third parties and to increase confidentiality. By adjusting the amplitude and phase of the signal, active silence is generated between the caller and the two fixed positions of the hands-free telephone microphone.
A feature of the caller is that the conversation is not disturbed by the sound output from the BGM sound source.
【０００５】[0005]
【実施例】電話機の設置場所はオフィス、家庭をはじめ
として街頭、百貨店、スパーストア、駅舎等、静粛又は
騒音環境様々であって、電話機がブース内に設置されて
いない限り、通話者の話声が第三者に聞かれてしまう機
会が多い。従ってハンズフリー電話機を使用する場所
が、一般に自由空間に設置されるものとして以下図面に
より本発明の一実施例について詳説する。[Example] The location of the telephone set is office, home, street, department store, superstore, station building, etc., and it is quiet or in various noise environments. Unless the telephone is installed in the booth, the voice of the caller can be spoken. Is often asked by a third party. Therefore, one embodiment of the present invention will be described in detail below with reference to the drawings assuming that the place where the hands-free telephone is used is generally installed in a free space.
【０００６】ここに図１は本発明を実現するための配置
図、図２は制御系全体の回路構成図である。先ず図１に
おいて電話回線に直結した電話機Ｔに、通話用マイクロ
ホンＭ及びスピーカＳを収納したハンズフリー電話機ス
タンド１、Ｐ1 は送話者、Ｐ0 は第三者、３は送話者の
通話送受可能な離隔距離内で通話用マイクロホンと送話
者との２地点間の距離を検出するための人体センサであ
り、音源制御部４内で図２に示すように演算回路４−３
及び制御回路４−４を経て、上記３地点に定置したＢＧ
Ｍ音源２−１、２−２、２−３の各音声信号の振幅及び
位相を制御する可変移相器４−２１、４−２２、４−２
３及び可変増幅器４−１１、４−１２、４−１３に検出
結果が伝送される。FIG. 1 is a layout diagram for realizing the present invention, and FIG. 2 is a circuit configuration diagram of the entire control system. First, in FIG. 1, a hands-free telephone stand 1, P 1 is a talker, P 0 is a third party, and 3 is a talker of a talker, in which a telephone T directly connected to a telephone line accommodates a communication microphone M and a speaker S. A human body sensor for detecting a distance between two points of a call microphone and a talker within a transmission / reception distance, and an arithmetic circuit 4-3 in the sound source control section 4 as shown in FIG.
And the BG stationed at the above three points via the control circuit 4-4.
Variable phase shifters 4-21, 4-22, 4-2 for controlling the amplitude and phase of each audio signal of the M sound sources 2-1, 2-2, 2-3.
3 and the variable amplifiers 4-11, 4-12, 4-13, the detection result is transmitted.
【０００７】次に本発明に採用した能動消音の原理を通
話者と通話用マイクロホンの２地点に作用させる場合に
ついて説明するに当たり、実際の自由空間での音波のも
つ周波数、位相、レベルが複雑に混在しているが、問題
を簡単化するため、音声信号が単一の周波数のみを有す
るものとして取り扱うものとする。即ち、ＢＧＭ音源の
音声信号ｆS は振幅の瞬時最大値Ａ、角周波数ω、初期
位相θS からｆS ＝（ω）＝ＡＳｉｎ（ωｔ＋θS ）で
表され、１つの音源から放射した音声波が距離ｒ隔たっ
た地点で位相θS をもつ球面波と考えた場合、ｆ
r （ω）＝Ａ／ｒ2 Ｓｉｎ（ωｔ＋θr ）で与えられ
る。今、空気中での角周波数ωの音声波長λから、上記
位相θr ＝２πｒ／λ＋θS となるが、同じ周波数成分
をもつ音声波が複数地点から放射される時には、位相関
係によっては干渉が生じ、合成された音声信号のレベル
は区々に変動する。しかし例えば点１、点２の音源から
放射された音波信号の位相を夫々θr1、θr2とし、｜θ
r1＋θr2｜＝（２ｎ＋１）πの条件に近い場合には、点
１、点２から放射された音波信号は相互に打ち消すこと
になる。Next, in explaining the case where the principle of active noise reduction adopted in the present invention is applied to two points of the caller and the microphone for communication, the frequency, phase, and level of the sound wave in the actual free space are complicated. Although mixed, to simplify the problem, the audio signal shall be treated as having only a single frequency. That is, the voice signal f S of the BGM sound source is represented by f S = (ω) = ASin (ωt + θ S ) from the instantaneous maximum value A of the amplitude, the angular frequency ω, and the initial phase θ S , and the voice wave radiated from one sound source F is a spherical wave with phase θ S at a distance r, f
It is given by r (ω) = A / r 2 Sin (ωt + θ r ). Now, from the audio wavelength λ of the angular frequency ω in the air, the above phase θ r = 2πr / λ + θ S , but when audio waves having the same frequency component are radiated from multiple points, interference may occur depending on the phase relationship. The level of the generated and synthesized audio signal varies from one region to another. However, for example, the phases of the sound wave signals radiated from the sound sources at points 1 and 2 are θ r1 and θ r2 , respectively.
When the condition of r1 + θ r2 | = (2n + 1) π is close, the sound wave signals emitted from the points 1 and 2 cancel each other.
【０００８】一方、振幅に関しては点１、点２での放射
音波の周波数のもつ振幅の瞬時最大値をＡ1 、Ａ2 とす
ると、夫々ｒ1 、ｒ2 隔たった地点での信号レベルはＡ
1 ／ｒ1 2＝Ａ2 ／ｒ2 2の関係から音声信号レベルは零に
漸近し、夫々の地点に立つ人間（本実施例では通話者）
には殆ど音声が聞こえない状態になる。On the other hand, regarding the amplitude, assuming that the instantaneous maximum values of the frequencies of the radiated sound waves at points 1 and 2 are A 1 and A 2 , respectively, the signal levels at points separated by r 1 and r 2 are A and A 2 , respectively.
From the relationship of 1 / r 1 2 = A 2 / r 2 2 , the voice signal level asymptotically approaches zero, and humans standing at the respective points (callers in this embodiment).
Is almost inaudible.
【０００９】本発明においては、能動消音を生ぜしめる
べき地点が、通話用マイクロホン及び通話者の２地点を
Ｐ、Ｑとすると、３地点以上にＢＧＭ音源を定置すれば
よく、３音源１、２、３の内、１つを基準として夫々の
音声信号ｆS1、ｆS2、ｆS3を表すと、ｆS1（ω）＝Ｓｉ
ｎ（ωｔ）、ｆS2（ω）＝Ａ2 Ｓｉｎ（ωｔ＋θS2）、
ｆS3（ω）＝Ａ3 Ｓｉｎ（ωｔ＋θS3）となり、Ａ2 、
Ａ3 、θ2 、θ3 の４つの未知数が求まる。In the present invention, if the points where the active muffling is to be generated are P and Q, which are the microphone for call and the two points of the caller, it is sufficient to place the BGM sound sources at three or more points. When each of the audio signals f S1 , f S2 , and f S3 is expressed with reference to one of the three, f S1 (ω) = Si
n (ωt), f S2 (ω) = A 2 Sin (ωt + θ S2 ),
f S3 (ω) = A 3 Sin (ωt + θ S3 ) and A 2 ,
Four unknowns A 3 , θ 2 and θ 3 are obtained.
【００１０】そこで、３音源の各地点（Ｎ＝１、２、
３）とＰ、Ｑ点との距離を夫々ｒNP、ｒNQとすると、理
想化した能動消音を考えてＰ点についてはｆr1P （ω）
＋ｆr2P （ω）＋ｆr3P （ω）＝０で合成された音声波
は零になる。ここに各位相θr1P 、θr2P 、θr3P を夫
々２πｒ1P／λ、２πｒ2P／λ＋θS2、２πｒ3P／λ＋
θS3として代入すると、１／ｒ1P 2 ・Ｓｉｎ（ωｔ＋θ
r1P ）＋Ａ2 ／ｒ2P 2 ・Ｓｉｎ（ωｔ＋θr 2P）＋Ａ3
／ｒ3P 2 ．Ｓｉｎ（ωｔ＋θr 3P）＝０が得られ、これ
に三角関数の加法定理を適用して分解すれば、ωｔの項
を分離してＳｉｎωｔ・ＦP ＋Ｃｏｓωｔ×ＧP ＝０と
なる。ただし、ＦP ＝１／ｒ1P 2 Ｃｏｓθr1P ＋Ａ2 ／
ｒ2P 2 Ｃｏｓθr2P ＋Ａ3 ／ｒ3P 2 Ｓｉｎθr3P 、ＧP
＝１／ｒ1P 2 Ｓｉｎθr1P ＋Ａ2 ／ｒ2P 2 Ｓｉｎθr2P
＋Ａ3 ／ｒ3P 2 Ｓｉｎθr3P が導かれ、時間ｔに対し恒
等式とするには、ＦP ＝０、ＧP ＝０でなくてはならな
いから、上記４つの未知数に対して２つの方程式が得ら
れた。又、Ｑ点についても同様に２つの方程式にまとめ
られるので、数値解析技法によってこれらの方程式の解
を求めれば、上記４つの未知数全部が求められることに
なる。Therefore, each point of three sound sources (N = 1, 2,
3) and the distances between points P and Q are r NP and r NQ , respectively, in consideration of idealized active noise suppression, f r1P (ω) at point P
The voice wave synthesized at + f r2P (ω) + f r3P (ω) = 0 becomes zero. Here, the respective phases θ r1P , θ r2P , and θ r3P are respectively 2πr 1P / λ, 2πr 2P / λ + θ S2 , 2πr 3P / λ +
Substituting as θ S3 , 1 / r 1P 2 · Sin (ωt + θ
r1P ) + A 2 / r 2P 2 · Sin (ωt + θ r 2P ) + A 3
/ R 3P 2 . Sin (ωt + θ r 3P ) = 0 is obtained, and if the addition theorem of trigonometric functions is applied and decomposed, the term of ωt is separated and Sinωt · F P + Cos ωt × G P = 0. However, F P = 1 / r 1P 2 Cos θ r1P + A 2 /
r 2P 2 Cosθ r2P + A 3 / r 3P 2 Sinθ r3P , GP
= 1 / r 1P 2 Sinθ r1P + A 2 / r 2P 2 Sinθ r2P
+ A 3 / r 3P 2 Sinθ r3P is derived, and in order to be an identity with respect to time t, F P = 0 and G P = 0 must be satisfied, so two equations are obtained for the above four unknowns. Was given. Further, since the Q point can be similarly put together into two equations, if the solutions of these equations are obtained by the numerical analysis technique, all the above four unknowns will be obtained.
【００１１】以上を要約すると、３つの音源からの音声
信号がもつ振幅と位相を夫々調整することによって、任
意の２地点での合成された音声信号が互いに打ち消し合
うように作用させることができる。To summarize the above, by adjusting the amplitude and the phase of the voice signals from the three sound sources respectively, the synthesized voice signals at arbitrary two points can be made to cancel each other.
【００１２】なお、秘話モードとするか否かを、音源制
御部に別途スイッチを設けて、周囲の状況に応じて切り
換えるようにしてもよい。Incidentally, whether or not to use the secret mode may be provided by separately providing a switch in the sound source control section so as to be switched according to the surrounding situation.
【００１３】[0013]
【発明の効果】よって本発明はハンズフリー電話機を使
用しての通話時に、送話者を含む電話機の設置空間にＢ
ＧＭを流すことにより、通話内容が周囲の送話者以外の
第三者に対して漏れないように穏やかなＢＧＭ音を聴取
させる能動消音方式を採用したことによって、送話内容
の秘話性を向上させることが可能となった。As described above, according to the present invention, when a call is made using a hands-free telephone, B is installed in the installation space of the telephone including the sender.
Improves confidentiality of the transmitted content by adopting an active mute system that allows a gentle BGM sound to be heard so that the content of the call is not leaked to a third party other than the surrounding speaker by playing the GM. It became possible to do.
【図１】本発明の秘話モード付きハンズフリー電話装置
の配置図。FIG. 1 is a layout view of a hands-free telephone device with a secret talk mode according to the present invention.
【図２】図１の電話機並びにＢＧＭ音源を制御する音源
制御部の回路構成図。FIG. 2 is a circuit configuration diagram of a sound source control unit that controls the telephone and the BGM sound source of FIG.
１ ハンズフリー電話機スタ
ンド Ｍ 通話用マイクロホン Ｓ 通話用スピーカ Ｔ 電話機 ２−１、２−２、２−３ ＢＧＭ音源 ３ 人体センサ ４ 音源制御部 Ｐ1 送話者 Ｐ0 第三者 ４−３ 演算回路 ４−４ 制御回路 ４−５ ＢＧＭ信号源 ４−１１、４−１２、４−１３可変増幅器 ４−２１、４−２２、４−２３可変移相器1 Hands-free phone stand M Call microphone S Call speaker T Phone 2-1, 2-2, 2-3 BGM sound source 3 Human body sensor 4 Sound source controller P 1 Talker P 0 Third party 4-3 Arithmetic circuit 4-4 Control Circuit 4-5 BGM Signal Source 4-11, 4-12, 4-13 Variable Amplifier 4-21, 4-22, 4-23 Variable Phase Shifter
Claims (3)
電話回線に直結された電話機を介して相手方と通話交信
するハンズフリー電話装置において、上記マイクロホン
設置定点と送話者とが通話送受信可能な離隔距離にある
２地点間が選択可能であり、通話開始に伴って上記２地
点を夫々取囲む如き少なくとも３つ以上の地点にＢＧＭ
音源を夫々分散配置するとともに、上記２地点に向かっ
て放音した各ＢＧＭ音源からの音声信号波の振幅と位相
とを、上記ＢＧＭ音源により合成される音声波が上記送
話者と上記通話用マイクロホンの位置において互いに打
ち消すように、秘話モードとして通話漏洩を阻止したこ
とを特徴とする秘話モード付きハンズフリー電話装置。1. In a hands-free telephone device that communicates with the other party through a telephone directly connected to a telephone line equipped with a microphone for communication and a speaker, a separation distance at which the fixed point for installing the microphone and the speaker can communicate. It is possible to select between two points in BGM, and at the beginning of the call, BGM is set at at least three points such as surrounding each of the above two points.
The sound sources are separately arranged, and the amplitude and phase of the voice signal wave from each BGM sound source emitted toward the above two points are synthesized by the BGM sound source so that the voice wave is used for the talker and the call. A hands-free telephone device with a secret talk mode, which is characterized by blocking call leakage as a secret talk mode so that they cancel each other at the position of the microphone.
置定点から離間移動する送話者との距離を人体センサに
より検知することを特徴とする秘話モード付きハンズフ
リー電話装置。2. A hands-free telephone device with a secret talk mode according to claim 1, wherein a distance between the BGM sound source and a transmitter moving away from a fixed point is detected by a human body sensor.
可否を外部スイッチにより選択可能としたことを特徴と
する秘話モード付きハンズフリー電話装置。3. The hands-free telephone device with a secret talk mode according to claim 1, wherein whether or not the secret talk mode can be operated can be selected by an external switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4005642A JPH05191491A (en) | 1992-01-16 | 1992-01-16 | Hands-free telephone set with private conversation mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4005642A JPH05191491A (en) | 1992-01-16 | 1992-01-16 | Hands-free telephone set with private conversation mode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05191491A true JPH05191491A (en) | 1993-07-30 |
Family
ID=11616793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4005642A Pending JPH05191491A (en) | 1992-01-16 | 1992-01-16 | Hands-free telephone set with private conversation mode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05191491A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012132966A (en) * | 2010-12-20 | 2012-07-12 | Yamaha Corp | Conversation sound leakage prevention device |
| WO2021245871A1 (en) * | 2020-06-04 | 2021-12-09 | 日本電信電話株式会社 | Speech environment generation method, speech environment generation device, and program |
-
1992
- 1992-01-16 JP JP4005642A patent/JPH05191491A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012132966A (en) * | 2010-12-20 | 2012-07-12 | Yamaha Corp | Conversation sound leakage prevention device |
| WO2021245871A1 (en) * | 2020-06-04 | 2021-12-09 | 日本電信電話株式会社 | Speech environment generation method, speech environment generation device, and program |
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