JPH03824B2 - - Google Patents
Info
- Publication number
- JPH03824B2 JPH03824B2 JP60239350A JP23935085A JPH03824B2 JP H03824 B2 JPH03824 B2 JP H03824B2 JP 60239350 A JP60239350 A JP 60239350A JP 23935085 A JP23935085 A JP 23935085A JP H03824 B2 JPH03824 B2 JP H03824B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- telephone
- current
- constant voltage
- voltage element
- 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.)
- Expired
Links
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 claims description 6
- TVZRAEYQIKYCPH-UHFFFAOYSA-N 3-(trimethylsilyl)propane-1-sulfonic acid Chemical compound C[Si](C)(C)CCCS(O)(=O)=O TVZRAEYQIKYCPH-UHFFFAOYSA-N 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 230000005236 sound signal Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、回線に重畳された音声信号のダイ
ナミツクレンジを確保するとともに１回線に２台
以上の電話機が接続され、接続された電話機が２
台以上通話状態にあるいわゆるブランチ通話を可
能にした電話機回路に関するものである。[Detailed Description of the Invention] [Field of Industrial Application] This invention secures the dynamic range of voice signals superimposed on a line, and when two or more telephones are connected to one line, the connected telephones 2
This invention relates to a telephone circuit that enables so-called branch calls in which more than one telephone is in use.
従来、ダイヤル信号を送出する電話機では第４
図に示すような回路が用いられてきた。１ａ，１
ｂは電話機端子、２は通話回路、３はダイヤル信
号発生回路、４は前記ダイヤル信号発生回路３に
電流を供給する電流源、５はツエナダイオードで
ある。
Traditionally, telephones that send out dialing signals have a 4th
A circuit like the one shown in the figure has been used. 1a, 1
b is a telephone terminal; 2 is a communication circuit; 3 is a dial signal generation circuit; 4 is a current source that supplies current to the dial signal generation circuit 3; and 5 is a Zener diode.
上記電話機回路は、局から供給される直流電力
によつて動作し、音声信号は直流電圧に重畳され
伝送される。 The telephone circuit operates using DC power supplied from the station, and the voice signal is superimposed on the DC voltage and transmitted.
上記従来の電話機回路においては、電話機が局
から遠く離れた場所に設置され、線路の直流抵抗
によつて生ずる電圧降下のために電話機端子１
ａ，１ｂ間の電話機端電圧VLが低い場合、電話
機端電圧VLに重畳された音声信号がダイヤル信
号発生回路３の電源電圧VD付近まで下がると、
電流源４（例えば定電流ダイオード）は定電流特
性を保てなくなり（飽和領域に入る）、電話機端
電圧VL−電源電圧VD間のインピーダンスは低下
し第５図に示すような波形歪を与える。このと
き、音声信号のダイナミツクレンジを確保するた
めには、第６図に示すような通話回路２と直列に
ダイオード６（あるいは抵抗器）を接続すること
が考えられる。この場合、一般に電子化された電
話機は、例えば600形電話機と比較すると直流抵
抗が高いため、両電話機でブランチ通話をした場
合、電子化電話機側に分流供給される回線電流は
小になる上、電話機端電圧VLは通話回路２とダ
イオード６に分圧、印加されるため、通話回路２
に供給される直流電力が一層減少し、ブランチ通
話ができないという問題点があつた。
In the above-mentioned conventional telephone circuit, the telephone is installed far away from the station, and the voltage drop caused by the direct current resistance of the line causes the telephone terminal to
When the telephone terminal voltage V L between a and 1b is low, when the voice signal superimposed on the telephone terminal voltage V L drops to around the power supply voltage V D of the dial signal generation circuit 3,
The current source 4 (for example, a constant current diode) can no longer maintain constant current characteristics (enters the saturation region), and the impedance between the terminal voltage V L and the power supply voltage V D decreases, causing waveform distortion as shown in Figure 5. give. At this time, in order to ensure the dynamic range of the audio signal, it is conceivable to connect a diode 6 (or a resistor) in series with the communication circuit 2 as shown in FIG. In this case, electronic telephones generally have a higher DC resistance than, for example, a 600-type telephone, so if a branch call is made between both telephones, the line current that is shunted to the electronic telephone side will be small, and Since the telephone end voltage V L is divided and applied to the telephone circuit 2 and the diode 6,
There was a problem that the direct current power supplied to the branch office was further reduced, making it impossible to make branch calls.
この発明は、上記の問題点を解決するためにな
されたもので、通常の通話状態で、音声信号のダ
イナミツクレンジを確保し、ブランチ通話を可能
とする機能を備えた電話機回路を得ることを目的
とする。 This invention was made in order to solve the above-mentioned problems.It is an object of the present invention to obtain a telephone circuit having a function of ensuring dynamic range of the voice signal under normal call conditions and enabling branch calls. purpose.
この発明にかかる電話機回路は、電話機端電圧
を昇圧する定電圧素子を電話機の通話回路に直列
に接続し、定電圧素子の両端を交流的に短絡する
コンデンサを定電圧素子と並列に接続し、通話回
路から供給される回線電流が所定値以上の場合は
定電流を供給するとともに通話回線から供給され
る電流が所定値以下の場合は定電圧素子を短絡す
る手段を定電圧素子と並列に接続した昇圧回路を
具備したものである。
In the telephone circuit according to the present invention, a constant voltage element that boosts the terminal voltage of the telephone is connected in series to the communication circuit of the telephone, and a capacitor that shorts both ends of the constant voltage element in an alternating current manner is connected in parallel with the constant voltage element. A means for supplying a constant current when the line current supplied from the telephone circuit is above a predetermined value and short-circuiting the constant voltage element when the current supplied from the telephone circuit is below a predetermined value is connected in parallel with the constant voltage element. It is equipped with a booster circuit.
さらに、この発明では、回線電流が所定値以上
の場合は表示素子を点灯させて通話表示を行い、
また、回線電流が所定値以下の場合は表示素子を
消灯させる表示手段を具備したものである。 Furthermore, in the present invention, when the line current is equal to or higher than a predetermined value, the display element is turned on to indicate a call,
Furthermore, the apparatus is equipped with a display means that turns off the display element when the line current is below a predetermined value.
通話回路の電流値が大きいときは定電圧素子に
より電話機端電圧は昇圧され、また電流値が小さ
いときは、定電圧素子は短絡され、電話機端電圧
は昇圧されない。
When the current value of the communication circuit is large, the voltage at the telephone end is boosted by the constant voltage element, and when the current value is small, the constant voltage element is short-circuited and the voltage at the telephone end is not boosted.
そして、回線電流が所定値以上の場合は表示素
子が点灯し、所定値以下の場合は表示素子は消灯
する。 When the line current is above a predetermined value, the display element is turned on, and when it is below the predetermined value, the display element is turned off.
第１図はこの発明の一実施例を示すもので、第
４図と同一符号は同一部分を示し、７はこの発明
による昇圧回路、８は前記電話機端子１ａ，１ｂ
間電圧を昇圧する定電圧素子としてのツエナダイ
オード、９は前記ツエナダイオード８と並列に接
続しツエナダイオード８のアノードとカソード間
を交流的に短絡するコンデンサ、１０は前記ツエ
ナダイオード８と並列に接続し通話回路２に定電
流を供給する電界効果トランジスタ（以後FET
と略す）である。
FIG. 1 shows an embodiment of the present invention, in which the same reference numerals as in FIG.
a Zener diode as a constant voltage element that boosts the voltage between the Zener diode 8; a capacitor 9 connected in parallel with the Zener diode 8 and short-circuiting the anode and cathode of the Zener diode 8; and 10 connected in parallel with the Zener diode 8; A field effect transistor (hereinafter referred to as FET) supplies a constant current to the communication circuit 2.
).
次に、第１図の回路動作について説明する。こ
こで、電流源４を流れる電流が線路電流ILに対し
て十分小さいとすると、線路電流ILは、そのほと
んどが昇圧回路７に供給される。通常の通話状
態、すなわち、線路電流ILがFET１０の零ゲート
電圧のドレイン電流IDSSよりも大きい場合、FET
１０にはドレイン電流ID（＝IDSS）が流れるので、
ツエナダイオード８にはツエナ電流IZ（＝IL−ID＞
０）が流れ、電話機端電圧VLはツエナ電圧VZ分
昇圧される。したがつて、電話機端電圧VLは、
ダイヤル信号発生回路３の電源電圧VDに対して
十分高くなり、電話機端電圧VLに重畳された音
声信号のダイナミツクレンジは確保される。 Next, the operation of the circuit shown in FIG. 1 will be explained. Here, assuming that the current flowing through the current source 4 is sufficiently smaller than the line current I L , most of the line current I L is supplied to the booster circuit 7. In normal communication condition, that is, when the line current I L is larger than the zero gate voltage drain current I DSS of FET10, the FET
Since the drain current I D (=I DSS ) flows through 10,
The Zener diode 8 has a Zener current I Z (=I L − I D >
0) flows, and the telephone end voltage V L is boosted by the zener voltage V Z. Therefore, the telephone terminal voltage V L is
It is sufficiently higher than the power supply voltage V D of the dial signal generation circuit 3, and the dynamic range of the voice signal superimposed on the telephone end voltage V L is ensured.
一方、ブランチ通話時、すなわち、線路電流IL
がFET１０の零ゲート電圧のドレイン電流IDSSよ
りも小さい場合、ドレイン電流ID（＜IDSS）は線路
電流ILと等しくなり、ツエナダイオード８にはツ
エナ電流IZが流れない状態になる。このとき、
FET１０はオン状態にある。 On the other hand, during branch calls, that is, the line current I L
is smaller than the drain current I DSS at zero gate voltage of the FET 10, the drain current I D (<I DSS ) becomes equal to the line current IL , and the Zener diode 8 is in a state where no Zener current I Z flows. At this time,
FET10 is in the on state.
第２図に電話機抵抗RTEL−線路電流IL特性を示
す。この図において、線路電流ILが零ゲート電圧
のドレイン電流IDSSよりも大きい場合はツエナダ
イオード８で昇圧された分だけ電話機抵抗RTELが
増加するが、線路電流ILが零ゲート電圧のドレイ
ン電流IDSSよりも小さい場合は昇圧回路７がない
ときの電話機抵抗RTELと同じ値になる。 Figure 2 shows the telephone resistance R TEL vs. line current I L characteristics. In this figure, when the line current I L is larger than the drain current I DSS at zero gate voltage, the telephone resistance R TEL increases by the amount boosted by the Zener diode 8, but when the line current I L is larger than the drain current I DSS at zero gate voltage, If the current is smaller than I DSS , the value will be the same as the telephone resistance R TEL without the booster circuit 7.
次に第３図の実施例について説明する。第３図
は、第１図の昇圧回路７に表示手段を設けたもの
で、発光ダイオード１１、抵抗器１２を並列に接
続したものである。線路電流ILが零ゲート電圧の
ドレイン電流IDSSよりも大きいとすると、昇圧回
路７の両端にはツエナ電圧VZが発生する。ここ
で、発光ダイオード１１の順方向電流をILED、こ
のときのカソード−アノード間電圧をVLEDとする
と、次式で表す順方向電流ILEDが流れ、発光ダイ
オード１１は点灯する。 Next, the embodiment shown in FIG. 3 will be explained. FIG. 3 shows the booster circuit 7 of FIG. 1 provided with a display means, in which a light emitting diode 11 and a resistor 12 are connected in parallel. Assuming that the line current I L is larger than the drain current I DSS at zero gate voltage, a Zener voltage V Z is generated across the booster circuit 7 . Here, if the forward current of the light emitting diode 11 is I LED and the voltage between the cathode and the anode at this time is V LED , a forward current I LED expressed by the following equation flows, and the light emitting diode 11 lights up.
ILED＝（VZ−VLED）／Ｒ
一方、線路電流ILが零ゲート電圧のドレイン電
流IDSSよりも小さい場合、すなわち、ブランチ通
話においてはFET１０がオン状態となるため、
発光ダイオード１１の順方向電流ILEDは流れず、
発光ダイオード１１は消灯する。 I LED = (V Z −V LED )/R On the other hand, when the line current I L is smaller than the drain current I DSS at zero gate voltage, that is, in branch calls, the FET 10 is in the on state.
The forward current I LED of the light emitting diode 11 does not flow,
The light emitting diode 11 is turned off.
通常の通話状態（発信可能な状態）では発光ダ
イオード１１が点灯し、ブランチ通話においては
消灯するので、発呼者は、送受器を上げた時点で
発光ダイオード１１の点・消灯を確認すれば、通
話可能（発信可能）か否かを知ることができる。 The light emitting diode 11 lights up in a normal call state (state where you can make a call) and turns off in a branch call, so if the caller lifts up the handset and confirms that the light emitting diode 11 is on or off, It is possible to know whether or not it is possible to make a call (make an outgoing call).
なお、この発明において、FET１０を用いた
昇圧回路７は他にトランジスタあるいは定電流ダ
イオードを用いても構成でき、また、発光ダイオ
ード１１はフオトカプラ等の他の表示素子を用い
ても同じように構成できる。 In addition, in this invention, the booster circuit 7 using the FET 10 can be configured using a transistor or a constant current diode, and the light emitting diode 11 can be configured in the same way even if other display elements such as a photocoupler are used. .
以上説明したように、この発明は電話機端電圧
を昇圧する定電圧素子を電話機の通話回路に直列
に接続し、定電圧素子の両端を交流的に短絡する
コンデンサを低電圧素子と並列に接続し、通話回
路から供給される回線電流が所定値以上の場合は
定電流を供給するとともに通話回線から供給され
る電流が所定値以下の場合は定電圧素子を短絡す
る手段を定電圧素子と並列に接続した昇圧回路を
設けたので音声信号等のダイナミツクレンジを確
保するとともに、ブランチ通話を可能にすること
ができる。また通話表示を行うことにより、送受
器を上げるだけで通話（発信）可能か否かを知る
ことができる等の利点を有する。
As explained above, the present invention connects a constant voltage element that boosts the terminal voltage of the telephone in series to the communication circuit of the telephone, and connects a capacitor that AC shorts both ends of the constant voltage element in parallel with the low voltage element. , a means for supplying a constant current when the line current supplied from the communication circuit is above a predetermined value and short-circuiting the constant voltage element when the current supplied from the communication line is below a predetermined value is provided in parallel with the constant voltage element. Since a connected booster circuit is provided, it is possible to ensure the dynamic range of voice signals and the like, and also to enable branch calls. Further, by displaying the call display, there is an advantage that it is possible to know whether a call (outgoing call) is possible or not just by lifting the handset.
さらに、表示手段を設けて、回路電流が所定値
以上のとき表示素子を点灯させて通話表示を行
い、回路電流が所定値以下のときは表示素子を消
灯させるようにしたので、表示素子を確認するこ
とで通話可能か否かを知ることができる効果があ
る。 Furthermore, a display means is provided, and when the circuit current is above a predetermined value, the display element is turned on to indicate a call, and when the circuit current is below a predetermined value, the display element is turned off, so that the display element can be checked. This has the effect of letting you know whether or not you can make a call.
第１図はこの発明の一実施例を示す回路図、第
２図は第１図の回路動作を示す特性図、第３図は
この発明による通話表示の具体例を示す回路図、
第４図は従来のダイヤル信号発生回路を含む電話
機回路の図、第５図は第４図の回路図における音
声信号波形例を示す特性図、第６図は従来の昇圧
回路の一例を示す図である。
図中、１ａ，１ｂは電話機端子、２は通話回
路、３はダイヤル信号発生回路、４は電流源、
５，８はツエナダイオード、７は昇圧回路、９は
コンデンサ、１０はFET、１１は発光ダイオー
ド、１２は抵抗器である。
FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a characteristic diagram showing the circuit operation of FIG. 1, and FIG. 3 is a circuit diagram showing a specific example of the call display according to the invention.
Fig. 4 is a diagram of a telephone circuit including a conventional dial signal generation circuit, Fig. 5 is a characteristic diagram showing an example of an audio signal waveform in the circuit diagram of Fig. 4, and Fig. 6 is a diagram showing an example of a conventional booster circuit. It is. In the figure, 1a and 1b are telephone terminals, 2 is a communication circuit, 3 is a dial signal generation circuit, 4 is a current source,
5 and 8 are Zener diodes, 7 is a booster circuit, 9 is a capacitor, 10 is FET, 11 is a light emitting diode, and 12 is a resistor.
Claims (1)
る電話機回路において、電話機の電話機端電圧を
昇圧する定電圧素子を前記通話回路に直列に接続
し、前記定電圧素子の両端を交流的に短絡するコ
ンデンサを前記定電圧素子と並列に接続し、前記
通話回路から供給される回線電流が所定値以上の
場合は定電流を供給するとともに、前記通話回路
から供給される電流が所定値以下の場合は、前記
定電圧素子を短絡する手段を前記定電圧素子と並
列に接続してなる昇圧回路を備えたことを特徴と
する電話機回路。 ２ ダイヤル信号発生回路および通話回路を有す
る電話機回路において、電話機の電話機端電圧を
昇圧する定電圧素子を前記通話回路に直列に接続
し、前記定電圧素子の両端を交流的に短絡するコ
ンデンサを前記定電圧素子と並列に接続し、前記
通話回路から供給される回線電流が所定値以上の
場合は定電流を供給するとともに、前記通話回路
から供給される電流が所定値以下の場合は、前記
定電圧素子を短絡する手段を前記定電圧素子と並
列に接続してなる昇圧回路を備え、さらに前記回
線電流が所定値以上の場合は表示素子を点灯させ
て通話表示を行い、また前記回線電流が所定値以
下の場合は前記表示素子を消灯させる表示手段を
備えたことを特徴とする電話機回路。[Scope of Claims] 1. In a telephone circuit having a dial signal generation circuit and a telephone call circuit, a constant voltage element that boosts the terminal voltage of the telephone is connected in series to the telephone circuit, and both ends of the constant voltage element are connected to an alternating current voltage. A capacitor that is short-circuited is connected in parallel with the constant voltage element, and when the line current supplied from the communication circuit is above a predetermined value, a constant current is supplied, and when the current supplied from the communication circuit is below a predetermined value. In the case of the above, the telephone circuit is characterized in that the telephone circuit comprises a booster circuit formed by connecting means for short-circuiting the constant voltage element in parallel with the constant voltage element. 2. In a telephone circuit having a dial signal generation circuit and a telephone call circuit, a constant voltage element that boosts the telephone end voltage of the telephone is connected in series with the telephone circuit, and a capacitor that short-circuits both ends of the constant voltage element in an alternating current manner is connected to the telephone circuit. It is connected in parallel with a constant voltage element to supply a constant current when the line current supplied from the communication circuit is above a predetermined value, and to supply a constant current when the current supplied from the communication circuit is below a predetermined value. A step-up circuit is provided in which a means for short-circuiting a voltage element is connected in parallel with the constant voltage element, and further, when the line current is equal to or higher than a predetermined value, a display element is lit to indicate a call; A telephone circuit comprising: a display means for turning off the display element when the value is below a predetermined value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60239350A JPS62100058A (en) | 1985-10-28 | 1985-10-28 | telephone circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60239350A JPS62100058A (en) | 1985-10-28 | 1985-10-28 | telephone circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62100058A JPS62100058A (en) | 1987-05-09 |
| JPH03824B2 true JPH03824B2 (en) | 1991-01-09 |
Family
ID=17043437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60239350A Granted JPS62100058A (en) | 1985-10-28 | 1985-10-28 | telephone circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62100058A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS648863U (en) * | 1987-07-03 | 1989-01-18 |
-
1985
- 1985-10-28 JP JP60239350A patent/JPS62100058A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62100058A (en) | 1987-05-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0225069B1 (en) | Telephone power supply | |
| JPH03824B2 (en) | ||
| CA2076976A1 (en) | Private telephone system with simplified command feature | |
| US4609782A (en) | Solid state signal insertion circuit and method for use in a telephony system or the like | |
| US4013844A (en) | Line circuit for a universal key/internal telephone system | |
| JPH054362Y2 (en) | ||
| US4204094A (en) | Tone applying line circuit | |
| US4656660A (en) | Office line holding circuit with an automatic release function for direct connection telephone system | |
| KR0132267B1 (en) | Ring noise prevention circuit | |
| JP3683002B2 (en) | DC-DC converter power supply subscriber circuit | |
| KR920009133A (en) | Dial Digit Storeable and Stored Data Backup Method of Telephone Equipment | |
| KR200206519Y1 (en) | DIOD and DI circuit for hum noise reduction | |
| JPH0326772Y2 (en) | ||
| JPS6221097Y2 (en) | ||
| JP2859907B2 (en) | Network controller | |
| KR850000820Y1 (en) | On-hook dial device on the phone | |
| KR900008103B1 (en) | Telephone hook alarming device | |
| KR970007673B1 (en) | Talk current supply circuit of the telephone subscriber card | |
| JPS6135046A (en) | Call signal transmission circuit | |
| JPS5940753A (en) | Calling device | |
| JPS58225764A (en) | Howler tone circuit | |
| JPH08228216A (en) | Light emitting diode blinking method, light emitting diode blinking circuit, cordless telephone repeater | |
| JPS6030147B2 (en) | telephone terminal circuit | |
| KR19990035935A (en) | Attachments for telecommunication devices | |
| JPS63301657A (en) | Call signal generating circuit |