JPS60128762A - Telephone set circuit - Google Patents
Telephone set circuitInfo
- Publication number
- JPS60128762A JPS60128762A JP23691683A JP23691683A JPS60128762A JP S60128762 A JPS60128762 A JP S60128762A JP 23691683 A JP23691683 A JP 23691683A JP 23691683 A JP23691683 A JP 23691683A JP S60128762 A JPS60128762 A JP S60128762A
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- voltage
- circuit
- power source
- current
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/08—Current supply arrangements for telephone systems with current supply sources at the substations
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
Abstract
Description
【発明の詳細な説明】
発明の技術分野
本発明は電子化された電話機回路に係り、特に線路長が
長い場合にも音声信号のレベルが低下することがない電
話機回路に関するものである。TECHNICAL FIELD OF THE INVENTION The present invention relates to an electronic telephone circuit, and particularly to a telephone circuit in which the level of an audio signal does not decrease even when the line length is long.
従来技術と問題点
電−ｒ化した′ｒｎ話機は、従来の電話機のように変成
器回路等を使用することなく、すべて電子回路のみによ
って′電話機回路を構成するものであって、ＩＣ化しで
小形、軽ｆｉｔ化することを目的に開発が行われている
。PRIOR TECHNOLOGY AND PROBLEMS Telephone telephones do not use transformer circuits like conventional telephones, but instead consist entirely of electronic circuits, and cannot be integrated into ICs. Development is underway with the aim of making it smaller and more lightweight.
このような電子化電話機において、従来は送話器の音声
信号を増幅して局線に送出するための送話系アンプおよ
び局線の音声信号を増幅して受話器に供給するための受
話系アンプの電源としては、局線における直流電圧をそ
のまま利用する方法がとられていた。しかしながら電話
機側の直流抵抗を２２００とし、交換機側の直流抵抗と
、線路抵抗を考慮すると、電話機に到達する直流電圧は
最悪の場合４．４ｖ程度となる。さらに電子化電話機の
場合、接続される局線の極性の正負を統一するため入力
にダイオードブリッジを必要とし、このダイオードブリ
ッジの電圧降下が１４Ｖ程度であるため電話機内での直
流電圧は３ｖ前後になる。このうち音声信号の振幅とし
て最大１．５ｖを許容するものとすれば、送受話系アン
プの電源電圧として利用し得るのは１．５ｖ程度にすぎ
ないことになり、これでは上述の音声信号振幅を得るこ
とは困難である。Conventionally, in such electronic telephones, a transmitting system amplifier is used to amplify the voice signal from the handset and send it to the central office line, and a receiving system amplifier is used to amplify the voice signal from the central office line and supply it to the handset. As a power source, the direct current voltage from the office line was used as is. However, assuming that the direct current resistance on the telephone side is 2200, and considering the direct current resistance on the exchange side and the line resistance, the direct current voltage that reaches the telephone will be about 4.4 V in the worst case. Furthermore, in the case of electronic telephones, a diode bridge is required at the input to unify the positive and negative polarities of the connected office lines, and since the voltage drop of this diode bridge is about 14V, the DC voltage inside the telephone is around 3V. Become. If a maximum of 1.5V is allowed as the amplitude of the audio signal, only about 1.5V can be used as the power supply voltage for the transmitting/receiving amplifier. is difficult to obtain.
このように従来の電子化電話機においては、送受話系ア
ンプにおける電源電圧の制約のため、線路長が長い場合
等において、十分な音声信号レベルを得ることは難かし
かった。As described above, in conventional electronic telephones, it has been difficult to obtain a sufficient voice signal level when the line length is long due to power supply voltage restrictions in the transmitting/receiving amplifier.
発明の目的
本発明はこのような従来技術の問題点を解決しようとす
るものであって、その目的は電子化電話機回路において
送受話系アンプの電源発生のためにＤＣ／ＤＣコンバー
タを具えることによって、線路長が長い場合にも音声信
号レベルが低下することがない電話機回路を提供するこ
とにある。Purpose of the Invention The present invention aims to solve the problems of the prior art, and its purpose is to provide a DC/DC converter for generating power for a transmitting/receiving amplifier in an electronic telephone circuit. To provide a telephone circuit in which the audio signal level does not drop even when the line length is long.
発明の実施例
図は本発明の電話機回路の一実施例の構成を示している
。同図においてＤＢはダイオードブリッジ、Ｄ、、Ｄ、
はダイオード、Ｔｒ、〜Ｔｒ４はトランジスタ、ＺＤは
ツェナダイオード、ＡＩ−友は増幅器、ＲＩ ＋ Ｒ２
は抵抗、１はＤＣ／ＤＣコンバータ回路、２は平衡回路
網（Ｚｎ）、６は送話器（Ｔ）、４は受話器（Ｒ）であ
る。EMBODIMENT OF THE INVENTION The figure shows the configuration of one embodiment of the telephone circuit of the invention. In the same figure, DB is a diode bridge, D, ,D,
is a diode, Tr, ~Tr4 is a transistor, ZD is a Zener diode, AI-friend is an amplifier, RI + R2
1 is a resistor, 1 is a DC/DC converter circuit, 2 is a balanced network (Zn), 6 is a transmitter (T), and 4 is a receiver (R).
図において、局線り、、Ｌ、はダイオードブリッジＤＢ
を経て、その電圧の極性を図示のように統一される。ト
ランジスタＴｒ、は定電流源をなし、ダイオードＤ 、
ｔ Ｄｔによって定まる一定電圧によって定電流ｌＩを
生じる。トランジスタＴｒｔ 、 Ｔｒｓはそれぞれト
ランジスタＴｒＩとともにカレントミラー回路を形成し
、それぞれ電流１１と等しい値の電流ｉ２゜ｉ３を生じ
る。ツェナダイオードＺＤは電流ｉ！によってその両端
に一定電圧Ｖ、を発生し、この電圧はＤＣ／ＤＣコンバ
ータ回路１に電源として与えられる。ＤＣ／ＤＣコンバ
ータ回路１はこれによって一定電圧からなる出力電圧Ｖ
！を生じ、この電圧はアンプＡ、〜Ａｊに電源として与
えられる。一方、アンプ４にはトランジスタＴ’ｒａに
おける電流Ｉｓがそのまま電源として与えられる。In the figure, the central line, L, is a diode bridge DB.
The polarity of the voltage is unified as shown in the figure. The transistor Tr constitutes a constant current source, and the diode D,
A constant voltage determined by tDt produces a constant current lI. The transistors Trt and Trs each form a current mirror circuit together with the transistor TrI, and generate currents i2 and i3 having a value equal to the current 11, respectively. Zener diode ZD has current i! A constant voltage V is generated across the terminal, and this voltage is applied to the DC/DC converter circuit 1 as a power source. The DC/DC converter circuit 1 thereby generates an output voltage V consisting of a constant voltage.
! is generated, and this voltage is given to amplifiers A, ~Aj as a power source. On the other hand, the current Is in the transistor T'ra is directly applied to the amplifier 4 as a power source.
増幅器ＡＩ ＋ ＡＩはこれによって動作して、送話器
３の音声信号を増幅し、アンプＡ２の出力はさらにトラ
ンジスタＴｒ４を径て局線Ｌｌ ｖ Ｌｍに送出される
。Amplifier AI + AI operates thereby to amplify the audio signal of the transmitter 3, and the output of the amplifier A2 is further sent to the office line Ll v Lm via the transistor Tr4.
また同時に増幅器Ａ３ 、 Ａ、も動作して局線ＬＩ、
Ｌ２の音声信号を増幅し、アンプＡ４の出力によって受
話器４が動作する。At the same time, amplifiers A3 and A also operate to connect the station line LI,
The audio signal of L2 is amplified, and the receiver 4 is operated by the output of amplifier A4.
この際抵抗Ｒ＋、Ｒ２は、線路のインピーダンスをＺＬ
、平衡回路網２のインピーダンスをｚｎとじたとき、
ＲＬ ’ Ｒ２＝ Ｊ ・Ｚｎ
とノＩるようにその抵抗値を選ぶことによって、送話器
ろの行声信号が受話器４に漏れることを防止する、いわ
ゆる防側音回路としての作用を行う。At this time, resistors R+ and R2 change the impedance of the line to ZL.
By selecting the resistance value so that when the impedance of the balanced circuit network 2 is zn, RL ' R2 = J ・Zn, leakage of the voice signal from the transmitter to the receiver 4 is prevented. It functions as a so-called side sound prevention circuit.
このように図の電話機回路ではＤＣ／ＤＣコンノ鳴−夕
回路１を具えて、局線電圧から発生した一定電圧を入力
としてこれを任意の電圧に変換して、各増幅器に供給す
るように構成されている。ＤＣ／ＤＣコンバータ回路は
その電圧変換比を任意に選ぶことができるので、例えば
図において入力電圧ｖ１を１．２ｖとしたときその出力
゛電圧ｖ２を５ｖにすることば容易であり、従って線路
長が長い最悪条件のもとでも所望の音声信号レベルを得
ることがでさるようになる。In this way, the telephone circuit shown in the figure is equipped with a DC/DC converter ringer circuit 1, and is configured to input a constant voltage generated from the office line voltage, convert it into an arbitrary voltage, and supply it to each amplifier. has been done. Since the voltage conversion ratio of the DC/DC converter circuit can be arbitrarily selected, for example, when the input voltage v1 is 1.2V in the figure, it is easy to set the output voltage v2 to 5V, and therefore the line length is It becomes possible to obtain a desired audio signal level even under long worst conditions.
発明の詳細
な説明したように本発明の電話機回路によれば、局線か
も供給される直流電圧を変換昇圧する１）Ｃ／Ｉ）Ｃコ
ンバー、夕回路を具え、このＤＣ／ＤＣコンバータ回路
の出力電圧を送話回路および受話回路における増幅器の
電源とするようにしたので線路長が長い最悪の場合でも
各増幅器に所望の電源電圧を供給することができ、従−
って所要の音声信号レベルを容易に得ることができる。As described in detail, the telephone circuit of the present invention includes 1) a C/I) C converter and an output circuit for converting and boosting a DC voltage supplied from a central office line; Since the output voltage is used as the power supply for the amplifiers in the transmitter and receiver circuits, even in the worst case where the line length is long, the desired power supply voltage can be supplied to each amplifier, and the slave
The required audio signal level can be easily obtained.
図は本発明の電話機回路の一実施例の構成を示す図であ
る。
１・・・ＤＯ／ＤＣコンバータ回路、２・・・平衡回路
網（Ｚｎ） 、５−送話器（Ｔ）、４・・・受話器（Ｒ
）、ＤＢ−・・ダイオードブリッジ、Ｄ、、Ｉ）２・・
・ダイオード、Ｔｒｌ〜１“１番・・・トランジスタ、
ＺＤ・・・ツェナダイオード、Ａ１−Ａ４・・・増幅器
、Ｒ１，Ｒ２１１，抵抗特許出願人 富士通株式会社
代理人 弁理士玉蟲久す９部
（外１名）The figure shows the configuration of one embodiment of the telephone circuit of the present invention. DESCRIPTION OF SYMBOLS 1... DO/DC converter circuit, 2... Balanced circuit network (Zn), 5-telephone (T), 4... Receiver (R)
), DB-... diode bridge, D,, I)2...
・Diode, Trl ~ 1 "No. 1...Transistor,
ZD...Zena diode, A1-A4...Amplifier, R1, R211, resistor Patent applicant Fujitsu Limited agent Patent attorney Hisashi Tamamushi 9th department (1 other person)
Claims (1)
子化された電話機において、局線から供給される的流屯
圧を変換昇圧するＤ Ｃ／ Ｄ Ｃコンバータ回路を具
え、該ＤＣ／ＤＣコンバータ回路の出力電圧を送話回路
および受話回路における増幅回路の゛市原とすることを
特徴とする電話機回路。An electronic telephone having an amplifier circuit in each of a transmitting circuit and a receiving circuit, which is equipped with a DC/DC converter circuit for converting and boosting the target current pressure supplied from a central office line, and the DC/DC converter circuit A telephone circuit characterized in that the output voltage of the amplifier circuit in the transmitting circuit and the receiving circuit is set to the output voltage of the amplifier circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23691683A JPS60128762A (en) | 1983-12-15 | 1983-12-15 | Telephone set circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23691683A JPS60128762A (en) | 1983-12-15 | 1983-12-15 | Telephone set circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60128762A true JPS60128762A (en) | 1985-07-09 |
Family
ID=17007647
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23691683A Pending JPS60128762A (en) | 1983-12-15 | 1983-12-15 | Telephone set circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60128762A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6229349A (en) * | 1985-07-31 | 1987-02-07 | Toshiba Corp | Amplifier circuit for telephone set |
| JP2002316079A (en) * | 2001-04-20 | 2002-10-29 | New Delta Ind Co | Power spray |
| JP2008284270A (en) * | 2007-05-21 | 2008-11-27 | Ge Medical Systems Global Technology Co Llc | Rf coil drive circuit and mri apparatus |
-
1983
- 1983-12-15 JP JP23691683A patent/JPS60128762A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6229349A (en) * | 1985-07-31 | 1987-02-07 | Toshiba Corp | Amplifier circuit for telephone set |
| JP2002316079A (en) * | 2001-04-20 | 2002-10-29 | New Delta Ind Co | Power spray |
| JP2008284270A (en) * | 2007-05-21 | 2008-11-27 | Ge Medical Systems Global Technology Co Llc | Rf coil drive circuit and mri apparatus |
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