JPS60223284A - Preventing circuit for leakage of audible sound - Google Patents

Preventing circuit for leakage of audible sound

Info

Publication number
JPS60223284A
JPS60223284A JP59062164A JP6216484A JPS60223284A JP S60223284 A JPS60223284 A JP S60223284A JP 59062164 A JP59062164 A JP 59062164A JP 6216484 A JP6216484 A JP 6216484A JP S60223284 A JPS60223284 A JP S60223284A
Authority
JP
Japan
Prior art keywords
circuit
audible sound
amplifier
speaker
impedance
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
Application number
JP59062164A
Other languages
Japanese (ja)
Inventor
Eiji Iitaka
飯高　永次
Masahide Kubo
久保　征英
Hisahito Takano
高野　寿仁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HASEGAWA DENKI SEISAKUSHO KK
Fujitsu Ltd
Original Assignee
HASEGAWA DENKI SEISAKUSHO KK
Fujitsu Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by HASEGAWA DENKI SEISAKUSHO KK, Fujitsu Ltd filed Critical HASEGAWA DENKI SEISAKUSHO KK
Priority to JP59062164A priority Critical patent/JPS60223284A/en
Publication of JPS60223284A publication Critical patent/JPS60223284A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
    • H04M9/003—Transmission of control signals from or to the key telephone set; signalling equipment at key telephone set, e.g. keyboard or display equipment

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

PURPOSE:To transmit the audible sounds through a speaker and also to prevent leakage of these sounds to a subscriber at the remote side, by connecting a circuit having a low input Z and a high output Z between call lines and a speaker amplifier and connecting the output of an audible sound generating circuit between the amplifier and said circuit connected between the call lines and the amplifier. CONSTITUTION:A transistor circuit 15 having a low input impedance and a high output impedance is connected between call lines L1 and L2 and an amplifier 6 which drives a speaker 7. Then an output terminal of an audible sound generating circuit 18 is connected between the circuit 15 and the amplifier 6. Therefore an audible sound given from the circuit 8 has a low impedance at the side of the amplifier 6 and a high impedance at the side of the circuit 15. Thus the sound is transmitted only to the amplifier 6, and the leakage of the audible sounds can be avoided by the circuit 15 to a subscriber at the remote side.

Description

【発明の詳細な説明】 発明の技術分野 本発明は、ボタン電話装置に於いて、可聴音と通話線か
らの音声とが同時にスピーカから出力される時に、可聴
音を通話線を介して相手加入者側に送出されないように
した可聴音漏れ防止回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a button telephone device in which, when audible tone and voice from a telephone line are simultaneously output from a speaker, the audible tone is transmitted to the other party via the telephone line. The present invention relates to an audible sound leakage prevention circuit that prevents audible sound from being transmitted to the user's side.

従来技術と問題点 ボタン電話装置は、例えば第１図に示す構成を有するも
のであり、Ｌｌ、Ｌ２は通話線、Ｌ３゜Ｌ４はデータ線
、１は通話回路網、２は受話器、３は送話器、４はフッ
クスイッチ、５はトランス、６は増幅器、７はスピーカ
、８は可聴音発生回路、９はマイクロプロセッサ（ＭＰ
Ｕ）　、１０はキーボード（ＫＥＹ）　、１１は駆動回
路（ＤＲＶ）、１２は発光ダイオード等の表示素子、１
３は半導体スイッチ、１４は送受信回路である。通話線
Ｌｌ、Ｌ２により音声信号が伝送され、データ線Ｌ３．
Ｌ４により各種データ及び発呼情報や着呼情報等が伝送
されるものである。Prior Art and Problems The button telephone device has the configuration shown in FIG. 1, for example, in which Ll and L2 are communication lines, L3 and L4 are data lines, 1 is a communication circuit network, 2 is a receiver, and 3 is a transmitter. 4 is a hook switch, 5 is a transformer, 6 is an amplifier, 7 is a speaker, 8 is an audible sound generation circuit, 9 is a microprocessor (MP
U), 10 is a keyboard (KEY), 11 is a drive circuit (DRV), 12 is a display element such as a light emitting diode, 1
3 is a semiconductor switch, and 14 is a transmitting/receiving circuit. Voice signals are transmitted through communication lines Ll and L2, and data lines L3.
Various data, call origination information, incoming call information, etc. are transmitted through L4.

受話器２と送話器３とからなるハンドセントを取り上げ
ることにより、フックスイッチ４が図示状態から通話回
路１ｉ４１側へ切換えられるオフフック状態となり、こ
の通話回路網１は通話線Ｌｌ。By picking up the handset consisting of the receiver 2 and the transmitter 3, the hook switch 4 is switched from the illustrated state to the telephone line 1i41 side, ie, an off-hook state, and this telephone network 1 is switched to the telephone line Ll.

Ｌ２に接続されるので、受話器２と送話器３とにより相
手加入者と通話できることになる。又オンフッタ状態で
は、通話線Ｌｌ、Ｌ２は、フックスイッチ４、トランス
５、半導体スイッチ１３を介して増幅器６と接続され、
増幅器６の出力はスピ−力７に加えられるので、スピー
カ７から相手加入者の音声が出力されることになる。Since it is connected to L2, it is possible to talk to the other subscriber using the receiver 2 and the transmitter 3. In the on-footer state, the communication lines Ll and L2 are connected to the amplifier 6 via the hook switch 4, the transformer 5, and the semiconductor switch 13.
Since the output of the amplifier 6 is added to the speaker 7, the voice of the other subscriber is output from the speaker 7.

又キーボード１０は、ダイヤル送出用等のテンキーを備
えているものであり、キーボード１０からのへカ信号は
マイクロプロセッサ９により識別処理されて、送受信回
路１４からデータ線Ｌ３゜Ｌ４を介して構内交換機等へ
送出される。又各部の状態等を表示する表示素子１２は
、マイクロプロセッサ９からの指令によって動作する駆
動回路１１により表示制御される。Further, the keyboard 10 is equipped with a numeric keypad for dialing, etc., and the hexadecimal signal from the keyboard 10 is identified and processed by the microprocessor 9, and sent from the transmitting/receiving circuit 14 to the private branch exchange via data lines L3 and L4. etc. will be sent to. The display element 12, which displays the status of each part, is controlled by a drive circuit 11 that operates in response to instructions from the microprocessor 9.

可聴音発生回路８は、マイクロプロセッサ９により制御
されて、外線からの着信、内線からの着信、話中着信等
を識別できるように、それぞれに対応した周波数或いは
インターバルの可聴音を出力する発振器及びスイッチ等
を備えており、この可聴音は増幅器６に加えられ、スピ
ーカ７から送出される。The audible sound generation circuit 8 is controlled by a microprocessor 9 and includes an oscillator and an oscillator that output an audible sound at a frequency or interval corresponding to each of the incoming calls from an outside line, incoming calls from an extension line, busy calls, etc., so that incoming calls can be identified. This audible sound is added to an amplifier 6 and sent out from a speaker 7.

例えば、相手加入者からの音声をスピーカ７から送出し
ている時に、データ線Ｌ３．Ｌ４を介して着信情報が到
来すると、送受信回路１４がらマイクロプロセッサ９に
転送され、マイクロプロセッサ９は可聴音発生回路８を
制御して、話中着信音を発生させる。この話中着信音は
スピーカ７から送出されるので、話中着信があったこと
を識別することができるが、この時半導体スイッチ１３
がオン状態であると、可聴音発生回路８からの話中着信
音は、トランス５．フックスイッチ４１通話線Ｌ１．Ｌ
２を介して相手加入者側へ送出され、相手加入者の送話
を阻害する欠点が生じる。そこで、マイクロプロセッサ
９は、可聴音発生回路８から話中着信音等の可聴音を発
生させている時に、半導体スイッチ１３をオフとするよ
うに制御するものであった。For example, when audio from the other subscriber is being transmitted from the speaker 7, the data line L3. When incoming call information arrives via L4, it is transferred from the transmitting/receiving circuit 14 to the microprocessor 9, and the microprocessor 9 controls the audible tone generating circuit 8 to generate a busy ringtone. Since this busy ring tone is transmitted from the speaker 7, it is possible to identify that there is a busy call, but at this time, the semiconductor switch 13
is on, the busy ringtone from the audible tone generation circuit 8 is transmitted to the transformer 5. Hook switch 41 communication line L1. L
2 to the other party's subscriber side, resulting in the disadvantage that the other party's transmission is obstructed. Therefore, the microprocessor 9 controls the semiconductor switch 13 to turn off when the audible sound generation circuit 8 is generating an audible sound such as a busy ringtone.

前述のように、従来のボタン電話装置に於いては、可聴
音が相手加入者側へ漏れて送出されるのを防止する為に
・、半導体スイッチ１３及びこの半導体スイッチ１３の
制御手段を設けなければならないものであり、コストア
ップとなる欠点があった。又話中着信音をスピータ７か
ら出力させている間は、半導体スイッチ１３をオフ状態
に制御する為、相手加入者からの音声をスピーカ７から
出力することができなくなり、話中着信音の為に通話が
中断される欠点があった。As mentioned above, in the conventional button telephone device, a semiconductor switch 13 and a control means for the semiconductor switch 13 must be provided in order to prevent audible sounds from leaking to the other party's side. This has the drawback of increasing costs. Furthermore, while the busy ring tone is being output from the speaker 7, the semiconductor switch 13 is controlled to be in an OFF state, so the voice from the other subscriber cannot be output from the speaker 7, and the busy ring tone cannot be output from the speaker 7. had the disadvantage that calls would be interrupted.

発明の目的 本発明は、簡単な構成により相手加入者からの音声と同
時に可聴音をスピーカから送出させると共に、相手加入
者へ漏れるのを防止することを目的とするものである。OBJECTS OF THE INVENTION It is an object of the present invention to transmit audible sound from a speaker at the same time as the voice from the other subscriber using a simple configuration, and to prevent the audible sound from leaking to the other subscriber.

発明の構成 本発明は、通話線からの音声と可聴音発生回路からの可
聴音とをスピーカから出力させるボタン電話装置に於い
て、前記通話線と前記スピーカを駆動する増幅器との間
に入力インピーダンスが低く且つ出力インピーダンスが
高いトランジスタ回路を接続し、該トランジスタ回路と
前記増幅器との間に前記可聴音発生回路の出力端子を接
続したものであり、簡単な構成のトランジスタ回路でも
って、可聴音の相手加入者側への漏れを防止することが
できるものである。以下実施例について詳細に説明する
。Structure of the Invention The present invention provides a button telephone device that outputs voice from a telephone line and audible sound from an audible sound generating circuit from a speaker, in which an input impedance is provided between the telephone line and an amplifier that drives the speaker. A transistor circuit with low impedance and high output impedance is connected, and the output terminal of the audible sound generation circuit is connected between the transistor circuit and the amplifier. This can prevent leakage to the other party's side. Examples will be described in detail below.

発明の実施例 第２図は、本発明の実施例の要部ブロック図であり、第
１図と同一符号は同一部分を示し、１５はトランジスタ
回路である。このトランジスタ回路１５は、入力インピ
ーダンスが低く且つ出力インピーダンスが高い構成とし
、このトランジスタ回路１５と増幅器６との間に可聴音
発生回路８の出力端子を接続するものである。従って、
可聴音発生回路８からの可聴音は、増幅器６例のインピ
ーダンスが低く、トランジスタ回路１５側のインピーダ
ンスが高いので、増幅器６側へのみ伝送されることにな
り、トランジスタ回路１５により可聴音の相手加入者側
への漏れを防止することができることになる。Embodiment of the Invention FIG. 2 is a block diagram of essential parts of an embodiment of the invention, in which the same reference numerals as in FIG. 1 indicate the same parts, and 15 is a transistor circuit. The transistor circuit 15 has a configuration with low input impedance and high output impedance, and the output terminal of the audible sound generation circuit 8 is connected between the transistor circuit 15 and the amplifier 6. Therefore,
Since the impedance of the amplifier 6 is low and the impedance of the transistor circuit 15 side is high, the audible sound from the audible sound generation circuit 8 is transmitted only to the amplifier 6 side, and the transistor circuit 15 allows the audible sound to be transmitted to the other party. This makes it possible to prevent leakage to the parties.

第３図は、本発明の実施例のトランジスタ回路を示し、
Ｒ１−Ｒ４は抵抗、ＣＩ、Ｃ２はコンデンサ、Ｑはトラ
ンジスタ、＋Ｖは電源電圧であり、他の第２図と同一符
号は同一部分を示すものである。相手加入者からの音声
信号は、トランス５を介してトランジスタ回路１５に加
えられるものであり、トランジスタ回路１５に於いては
、コンデンサＣ１を介してトランジスタＱのベースに加
えられ、エミッタに接続されたコンデンサＣ２を介して
出力されて増幅器６に入力される。FIG. 3 shows a transistor circuit according to an embodiment of the present invention,
R1-R4 are resistors, CI and C2 are capacitors, Q is a transistor, +V is a power supply voltage, and the same symbols as in the other FIG. 2 indicate the same parts. The audio signal from the other subscriber is applied to the transistor circuit 15 via the transformer 5. In the transistor circuit 15, the audio signal is applied to the base of the transistor Q via the capacitor C1, and is connected to the emitter. The signal is output via the capacitor C2 and input to the amplifier 6.

又可聴音発生回路８の出力端子はトランジスタ回路１５
と増幅器６との間に接続されており、この接続点からト
ランジスタ回路１５側をみたインピーダンスは高く、増
幅器６側をみたインピーダンスは低いので、可聴音発生
回路８がらの可聴音は、増幅器６からスピーカ７に加え
られて出力されるが、トランジスタ回路１５を介してト
ランス５側へは出力されないものとなる。Further, the output terminal of the audible sound generation circuit 8 is a transistor circuit 15.
The impedance seen from this connection point toward the transistor circuit 15 side is high, and the impedance seen from the amplifier 6 side is low. Therefore, the audible sound from the audible sound generation circuit 8 is transmitted from the amplifier 6. The signal is applied to the speaker 7 and outputted, but is not outputted to the transformer 5 side via the transistor circuit 15.

従って、増幅器６の出力により駆動されるスピーカ７か
ら、相手加入者の通話音声と、可聴音発生回路８からの
可聴音とが同時に出力されることになり、且つ可聴音は
相手加入者側へ漏れることはなくなる。Therefore, from the speaker 7 driven by the output of the amplifier 6, the call voice of the other subscriber and the audible sound from the audible sound generation circuit 8 are output simultaneously, and the audible sound is sent to the other subscriber side. It will no longer leak.

又電源電圧＋■や抵抗Ｒ１−Ｒ３等の選定により、相手
加入者からの音声レベルが大きい場合にも、トランジス
タ回！１５で飽和しないようにすることができる。即ち
、トランジスタ回路１５を接続したことによる音声品質
の劣化が生じないようにすることは容易である。又トラ
ンジスタ回路１５は、可聴音発生回路８の出力端子を接
続した点からみてハイインピーダンスとなれば良いので
、前述の構成以外の回路構成を採用することも可能であ
る。Also, by selecting the power supply voltage +■ and resistors R1-R3, etc., even when the voice level from the other subscriber is high, the transistor times! 15 so as not to be saturated. That is, it is easy to prevent audio quality from deteriorating due to the connection of the transistor circuit 15. Furthermore, since the transistor circuit 15 only needs to have a high impedance when viewed from the point where it is connected to the output terminal of the audible sound generating circuit 8, it is also possible to adopt a circuit configuration other than the above-mentioned configuration.

発明の詳細 な説明したように、本発明は、通話線Ｌｌ。Details of the invention As explained above, the present invention is applicable to the communication line Ll.

Ｌ２とスピーカ７を駆動する増幅器６との間に入力イン
ピーダンスが低く且つ出力インピーダンスが高いトラン
ジスタ回路１５を接続し、このトランジスタ回路１５と
増幅器６との間に可聴音発生回路８の出力端子を接続し
たものであり、トランジスタ回路１５は簡単な回路構成
であるから、半導体スイッチ１３と同等かそれ以下のコ
ストで実現することが可能となる。又半導体スイッチ１
３をオフ状態として可聴音の漏れを防止するものではな
いので、相手加入者からの音声と可聴音発生回路８から
の可聴音とを同時にスピーカ７から出力することが可能
となり、話中着信音等により通話が中断されない利点も
ある。A transistor circuit 15 having low input impedance and high output impedance is connected between L2 and the amplifier 6 that drives the speaker 7, and the output terminal of the audible sound generating circuit 8 is connected between the transistor circuit 15 and the amplifier 6. Since the transistor circuit 15 has a simple circuit configuration, it can be realized at a cost equal to or lower than that of the semiconductor switch 13. Also, semiconductor switch 1
3 is turned off to prevent leakage of audible sound, it is possible to output the voice from the other party and the audible sound from the audible sound generation circuit 8 from the speaker 7 at the same time, and the busy ringtone There is also the advantage that the call is not interrupted due to such reasons.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は従来のボタン電話装置の要部ブロック図、第２
図は本発明の実施例の要部ブロック図、第３図は本発明
の実施例のトランジスタ回路を示すものである。 Ｌｌ、Ｌ２は通話線、Ｌ３．Ｌ４はデータ線、１は通話
回路網、２は受話器、３は送話器、４はフックスイッチ
、５はトランス、６は増幅器、７はスピーカ、８は可聴
音発生回路、９はマイクロプロセッサ（ＭＰＵ）　、１
０はキーボード（ＫＥＹ）、１１は駆動回路（ＤＲＶ）
　、ｌ　２は発光ダイオード等の表示素子、１４は送受
信回路、１５はトランジスタ回路、Ｑはトランジスタ、
Ｒ１−Ｒ４は抵抗、Ｃ１，Ｃ２はコンデン、すである。 特許出願人　富士通株式会社 外１名 代理人弁理士　相　谷　昭　司 代理人弁理士　渡　邊　弘　− 第１図 第２図Figure 1 is a block diagram of the main parts of a conventional key telephone device;
The figure is a block diagram of a main part of an embodiment of the present invention, and FIG. 3 shows a transistor circuit of an embodiment of the present invention. Ll, L2 are communication lines, L3. L4 is a data line, 1 is a telephone communication network, 2 is a receiver, 3 is a transmitter, 4 is a hook switch, 5 is a transformer, 6 is an amplifier, 7 is a speaker, 8 is an audible sound generation circuit, 9 is a microprocessor ( MPU), 1
0 is the keyboard (KEY), 11 is the drive circuit (DRV)
, l2 is a display element such as a light emitting diode, 14 is a transmitting/receiving circuit, 15 is a transistor circuit, Q is a transistor,
R1-R4 are resistors, and C1 and C2 are capacitors. Patent applicant: 1 person other than Fujitsu Ltd.Representative patent attorney: Shoji AitaniRepresentative patent attorney: Hiroshi Watanabe - Figure 1 Figure 2

Claims (1)

【特許請求の範囲】[Claims] ゛通話線からの音声と可聴音発生回路からの可聴音とを
スピーカから出力させるボタン電話装置に於いて、前記
通話線と前記スピーカを駆動する増幅器との間に入力イ
ンピーダンスが低く且つ出力インピーダンスが高いトラ
ンジスタ回路を接続し、該トランジスタ回路と前記増幅
器との間に前記可聴音発生回路の出力端子を接続したこ
とを特徴とする可聴音漏れ防止回路。゛In a button telephone device that outputs voice from a telephone line and audible sound from an audible sound generating circuit from a speaker, there is a device that has a low input impedance and a low output impedance between the telephone line and an amplifier that drives the speaker. 1. An audible sound leakage prevention circuit, characterized in that a transistor circuit of high quality is connected, and an output terminal of the audible sound generating circuit is connected between the transistor circuit and the amplifier.
JP59062164A 1984-03-31 1984-03-31 Preventing circuit for leakage of audible sound Pending JPS60223284A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59062164A JPS60223284A (en) 1984-03-31 1984-03-31 Preventing circuit for leakage of audible sound

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59062164A JPS60223284A (en) 1984-03-31 1984-03-31 Preventing circuit for leakage of audible sound

Publications (1)

Publication Number Publication Date
JPS60223284A true JPS60223284A (en) 1985-11-07

Family

ID=13192199

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59062164A Pending JPS60223284A (en) 1984-03-31 1984-03-31 Preventing circuit for leakage of audible sound

Country Status (1)

Country Link
JP (1) JPS60223284A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0464222A1 (en) * 1990-01-19 1992-01-08 Matsushita Electric Industrial Co., Ltd. Sound reproducing device
US5412733A (en) * 1990-01-19 1995-05-02 Matsushita Electric Industrial Co., Ltd. Acoustic reproducing apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0464222A1 (en) * 1990-01-19 1992-01-08 Matsushita Electric Industrial Co., Ltd. Sound reproducing device
US5412733A (en) * 1990-01-19 1995-05-02 Matsushita Electric Industrial Co., Ltd. Acoustic reproducing apparatus

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