JPS62159959A - Telephone line holding circuit - Google Patents
Telephone line holding circuitInfo
- Publication number
- JPS62159959A JPS62159959A JP61001701A JP170186A JPS62159959A JP S62159959 A JPS62159959 A JP S62159959A JP 61001701 A JP61001701 A JP 61001701A JP 170186 A JP170186 A JP 170186A JP S62159959 A JPS62159959 A JP S62159959A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- telephone line
- line
- holding
- telephone
- 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.)
- Granted
Links
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、同一の電話回線に並列に接続された他の電話
端末装置のオフフックにより、保留状態を自動解除する
電話回線の保留回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a telephone line hold circuit that automatically releases the hold state when another telephone terminal device connected in parallel to the same telephone line goes off-hook. .
従来の技術
近年、一般家庭においても電話機を２台以上設置する場
合が増えてきている。この様な場合、一本の電話回線に
並列に２台用−ヒの電話機を接続している。この時、自
分の電話を保留しておいて他の電話機をオフフックした
時、自分の電話が保留したままであるとインピーダンス
が程かするため他の電話機での通話の音量が低下したり
、側音が大きくなるという不都合が生じていた。この問
題を解決する為に、保留中の電話機に、他の電話機がオ
フフックされると保留を解除する機能をもたせている。BACKGROUND OF THE INVENTION In recent years, more and more households are installing two or more telephones. In such a case, two telephones are connected in parallel to one telephone line. At this time, when you put your call on hold and go off-hook to another phone, the impedance of your call will decrease, causing the volume of the call on the other phone to drop, or There was an inconvenience that the sound became louder. To solve this problem, a telephone on hold is provided with a function that releases the hold when another telephone goes off-hook.
この保留中に他の電話機がオフフックしたことを検出す
る手段として、回線の電圧がある決められた電圧より低
下した事を検出して保留の解除を行っている。As a means for detecting that another telephone has gone off-hook while the telephone is on hold, the hold is released by detecting that the line voltage has dropped below a certain predetermined voltage.
以下、図面を参照しながら上述したような従来の電話回
線の保留解除検出回路について説明を行う。Hereinafter, a conventional telephone line hold release detection circuit as described above will be explained with reference to the drawings.
第２図は従来の電話回線の保留回路の構成を示すもので
ある。第２図に於て、１．２は電話回線への接続端子、
３はダイオードブリッジ、５．８はトランジスタ、６は
ツェナー電圧１３Ｖのツェナーダイオード、４．７．９
は抵抗器、１０は保留制御回路、１１−１は保留スイッ
チ、１１−２は局線スイッチであり機械的に連動してお
り保留スイッチ１１−１が押されると局線スイッチ】１
−２がオフ状態になるように構成されている。FIG. 2 shows the configuration of a conventional telephone line holding circuit. In Figure 2, 1.2 is the connection terminal to the telephone line,
3 is a diode bridge, 5.8 is a transistor, 6 is a Zener diode with a Zener voltage of 13V, 4.7.9
is a resistor, 10 is a hold control circuit, 11-1 is a hold switch, and 11-2 is a station line switch, which are mechanically interlocked, and when the hold switch 11-1 is pressed, the station line switch]1
-2 is configured to be in the off state.
又、１２は電話機本体部である。Further, 12 is the main body of the telephone.
以上のように構成された従来の電話回線保留回路につい
て、以下その動作について説明する。The operation of the conventional telephone line hold circuit configured as described above will be explained below.
先ず電話をかける場合について説明する。局線スイッチ
１１−２を押してオン状態とし、続いて電話機本体部１
２のハンドセット（図示しない）をオフフック状態にす
ると電話回線は閉結され通話状態となる。この時、電話
回線間（接続端子１−２間）の電圧は７〜８Ｖ程度とな
る。次に電話回線を保留する時は、保留スイッチ１１−
１を押す。すると局線スイッチ１１−２はこれに応答し
てオフ状態となり電話回線間（接続端子１−２間）の電
圧は４８Ｖとなる。又、同時に保留制御回路１０は保留
スイッチ１１−１の操作に応答してトリガパルスを出力
し、トリガパルスはトランジスタ８のベースに印加され
、トランジスタ８のコレクタ・エミッタ間はオン状態と
なる。この為ツェナーダイオード６のアノードはＥ点の
電位に等しくなりトランジスタ５のベース電位はＥ点に
対して１３Ｖとなる。一方、電話回線間の電圧は４８Ｖ
となっているので、Ｄ−８間の電圧は４６．６■となっ
ている。トランジスタ５はＤ−８間の電圧が１３．７Ｖ
以上あればオン状態となるので、この場合はオン状態と
なる。従ってＡ点の電圧は抵抗器７を介してトランジス
タ８のベースに印加され、保留制御回路１０からのトリ
ガパルスがなくなってもＤ−８間のオン状態を継続する
事が出来、電話回線を保留する事が出来る。この時の電
話回線間の電圧は約１６Ｖとなっている。First, the case of making a phone call will be explained. Press the central office line switch 11-2 to turn it on, then turn on the telephone main unit 1.
When the second handset (not shown) is placed in an off-hook state, the telephone line is closed and a call is made. At this time, the voltage between the telephone lines (between the connection terminals 1 and 2) is about 7 to 8V. Next time you want to put the telephone line on hold, use the hold switch 11-
Press 1. Then, the office line switch 11-2 is turned off in response to this, and the voltage between the telephone lines (between the connection terminals 1 and 2) becomes 48V. At the same time, the hold control circuit 10 outputs a trigger pulse in response to the operation of the hold switch 11-1, the trigger pulse is applied to the base of the transistor 8, and the collector-emitter of the transistor 8 is turned on. Therefore, the anode of the Zener diode 6 becomes equal to the potential at point E, and the base potential of the transistor 5 becomes 13V with respect to point E. On the other hand, the voltage between the telephone lines is 48V
Therefore, the voltage between D and 8 is 46.6 . Transistor 5 has a voltage of 13.7V between D and 8.
If this is the case, it will be in the on state, so in this case it will be in the on state. Therefore, the voltage at point A is applied to the base of transistor 8 via resistor 7, and even if the trigger pulse from hold control circuit 10 disappears, the ON state between D-8 can be continued, and the telephone line is put on hold. I can do it. At this time, the voltage between the telephone lines is approximately 16V.
ここで、同じ電話回線に並列に接続されている別の電話
機がオフフックされると、それに伴なって回線電圧が低
下し約７〜８ｖとなる。この為Ｄ−Ｅ間の電圧は５．６
〜６．６ｖとなりトランジスタ５はベースに１３Ｖのツ
ェナーダイオード６が接続されているのでベース電流が
流れなくなり、コレクタ・エミッタ間はオフ状態となる
。従ってトランジスタ８のベースに印加される電圧がな
くなりトランジスタ８はオフ状態となり保留が解除され
る。この為、回線電圧が４８Ｖに上昇してもトランジス
タ５のベース電流は流れる事が出来ず保留は解除された
ままとなっている。又、抵抗器４．９は夫々トランジス
タ５．８のベース電位の安定化の為に接続されている。Here, when another telephone connected in parallel to the same telephone line goes off-hook, the line voltage decreases to about 7 to 8 volts. Therefore, the voltage between D and E is 5.6
~6.6V, and since the 13V Zener diode 6 is connected to the base of the transistor 5, no base current flows, and the collector-emitter becomes off. Therefore, the voltage applied to the base of transistor 8 disappears, transistor 8 is turned off, and the hold state is released. Therefore, even if the line voltage rises to 48V, the base current of transistor 5 cannot flow, and the hold state remains released. Further, resistors 4.9 are connected to stabilize the base potential of each transistor 5.8.
発明が解決しようとする問題点
しかしながら、上記のような構成では、保留の解除を回
線電圧が予め定められた電圧以下に低下した時に行なう
為、電話機のオフフック電圧以上に設定しなくてはなら
ず、種々の電話機のオフフック電圧のバラツキ、更に電
話局（交換機）に近い場所に設置された場合を考慮する
と、保留解除電圧をｌＯ数Ｖと高くせざるをえず、ＰＢ
Ｘ等２４ｖの回線電圧の下では誤動作が発生するという
問題点を有していた。又、回線電圧４．８ Ｖと２４Ｖ
の切り換えスイッチを設けて対処する方法も有るが、ス
イッチのコスト、電話機への取付スペース上で不利であ
り、使用者が操作を間違える恐れもあった。Problems to be Solved by the Invention However, in the above-described configuration, since the hold is released when the line voltage drops below a predetermined voltage, the off-hook voltage must be set higher than the off-hook voltage of the telephone. Considering the variations in the off-hook voltage of various telephones and the fact that they are installed near a telephone office (exchange), the hold release voltage has to be as high as several volts, and the PB
There was a problem in that malfunctions occurred under a line voltage of 24 V, such as X. Also, line voltage 4.8V and 24V
There is a method to deal with this problem by providing a changeover switch, but this is disadvantageous in terms of the cost of the switch and the installation space on the telephone, and there is also the risk that the user may make a mistake in operating it.
４一
本発明は上記従来技術に鑑みてなされたもので、保留解
除を回線電圧の変化を検出して行ない、通常の電話回線
やＰＢＸ等回等電線電圧なる場合にもスイッチ等で切り
換える必要の無い保留機能付電話機を提供するものであ
る。41 The present invention has been made in view of the above-mentioned prior art, and the hold release is performed by detecting a change in line voltage, and it is not necessary to switch with a switch etc. even when the line voltage is the same as that of a normal telephone line or PBX. This provides a telephone with a hold function.
問題点を解決するための手段
この目的を達成するために本発明の電話回線保留回路は
、保留時の電話回線の電圧に対応する値を所定の時間保
持する保持手段と、前記電話回線の電圧に対応する値と
前記保持手段の前記値とを比較し前記電話回線の電圧の
変化を検出する検出手段と、前記検出手段からの検出信
号により前記電話回線を開放する保留回路手段とから構
成されている。Means for Solving the Problems In order to achieve this object, the telephone line holding circuit of the present invention includes a holding means for holding a value corresponding to the voltage of the telephone line at the time of holding for a predetermined time, and a holding means for holding a value corresponding to the voltage of the telephone line at the time of holding, and and a detection means for detecting a change in the voltage of the telephone line by comparing a value corresponding to the value of the holding means with the value of the holding means, and a holding circuit means for releasing the telephone line in response to a detection signal from the detection means. ing.
作用
この構成によって、同一の電話回線に並列に接続されて
いる他の電話端末装置が使用され電話回線の電圧が現在
の保留電圧から変化（低下）すると保留状態を解除する
事となる。Effect With this configuration, when another telephone terminal device connected in parallel to the same telephone line is used and the voltage of the telephone line changes (decreases) from the current holding voltage, the holding state is released.
実施例
以下本発明の一実施例について、図面を参照しながら説
明する。EXAMPLE An example of the present invention will be described below with reference to the drawings.
第１図は本発明の一実施例に於ける電話回線保留回路の
主要部の回路図を示すものである。第１図に於て、１．
２は電話回線への接続端子、３はダイオードブリッジ、
１３は制御信号入力端子を有するスイッチング手段であ
り制御信号入力端子に制御手段信号が印加されるとオン
状態となる。FIG. 1 shows a circuit diagram of the main parts of a telephone line holding circuit in an embodiment of the present invention. In Figure 1, 1.
2 is the connection terminal to the telephone line, 3 is the diode bridge,
Reference numeral 13 denotes a switching means having a control signal input terminal, which is turned on when a control means signal is applied to the control signal input terminal.
１４はコンデンサ、１５．１６．１７は抵抗器、１８は
トランジスタ、１９は制御手段でありマイクロコンピュ
ータで構成される。２０は保留時に保留電流が流れる回
路網、２１は保留スイッチである。14 is a capacitor, 15, 16, and 17 are resistors, 18 is a transistor, and 19 is a control means, which is composed of a microcomputer. 20 is a circuit network through which a holding current flows during holding, and 21 is a holding switch.
以上のように構成された電話回線保留回路について、以
下その動作について説明する。保留スイッチ２１を押す
と制御手段１９は制御手段信号を出力し、これによりス
イッチング手段１３はオン状態となる。この為電話回線
の電圧は接続端子１．２を経てダイオードブリッジ３で
一定の極性に変換され、スイッチング手段１３、回路網
２０を通して回線電流が流れ電話回線を保留状態とする
。この時Ａ点の電圧はほぼ抵抗器１５．１６によってＢ
−Ｃ間の電圧を分圧した値となり、この電圧が抵抗器１
７を介してトランジスタ１８のベースに印加されトラン
ジスタ１８のコレクタ・エミッタ間がオンとなるように
回路定数が設定されている。この為制御手段１９の入力
端子Ｐ１は論理レベルの０となっている。又、コンデン
サ１４はＢ点・Ａ点間の電圧（Ｖｌ）により充電されて
いる。The operation of the telephone line hold circuit configured as described above will be explained below. When the hold switch 21 is pressed, the control means 19 outputs a control means signal, thereby turning the switching means 13 on. For this purpose, the voltage of the telephone line is converted into a constant polarity by the diode bridge 3 via the connection terminal 1.2, and a line current flows through the switching means 13 and the circuit network 20, putting the telephone line on hold. At this time, the voltage at point A is approximately equal to B due to resistor 15.16.
-C is the voltage divided, and this voltage is the voltage across resistor 1.
The circuit constants are set so that the voltage is applied to the base of the transistor 18 via the transistor 7, and the collector-emitter of the transistor 18 is turned on. Therefore, the input terminal P1 of the control means 19 is at a logic level of 0. Further, the capacitor 14 is charged by the voltage (Vl) between points B and A.
ここで、同一の電話回線に並列に接続されている他の電
話端末装置が使用される（オフフックされる）と、回線
の電圧は急に低下してくる。もともと電話回線の電圧は
一定では無く、電話局からの距離によっても変化するの
で、電話回線の電圧が変化してＡ点の電圧が低下しても
トランジスタ９はオン状態を保つ事が出来るように回路
定数を設定しである。しかし、他の電話端末装置がオフ
フックされた場合の様に急激に（コンデンサ１４及び抵
抗器１５により成立する放電時定数より速く）回線電圧
が低下すると、Ａ点の電圧は現在のＢ点・Ｃ点間の電圧
から最初コンデンサ１４に充電されていた電圧（ｖｌ）
を減じた電圧迄低下し、これによってトランジスタ１８
にベース電流を流す事が出来なくなりトランジスタ１８
のコレクタ・エミッタ間はオフ状態となり、制御手段１
９の入力端子Ｐ１は論理レベルの１となる。すると、制
御手段１９は入力端子Ｐ１が論理レベルの１となってい
る時間の計数を開始し、６００ｍ５以上継続すると出力
端子Ｐ２を論理レベルの０としスイッチング手段１３を
オフ状態として、電話回線を開放して保留状態を解除す
る。ここで、電話回線の電圧の低下に直ぐに応答しない
で６００ｍ５の時間遅れを設けているのは、比較的振幅
の大きい音声信号や、回線電圧の瞬間的な停電（瞬断）
等によって不用意に保留状態を解除してしまうという誤
動作を防止する為である。Here, when another telephone terminal device connected in parallel to the same telephone line is used (goes off-hook), the voltage of the line suddenly drops. Originally, the voltage of the telephone line is not constant and changes depending on the distance from the telephone office, so even if the voltage of the telephone line changes and the voltage at point A drops, transistor 9 can remain on. Set the circuit constants. However, if the line voltage drops suddenly (faster than the discharge time constant established by the capacitor 14 and resistor 15), as when another telephone terminal device goes off-hook, the voltage at point A will change from the current point B and C. The voltage initially charged in the capacitor 14 from the voltage between the points (vl)
, which reduces the voltage of transistor 18 to a voltage less than
Transistor 18 becomes unable to flow base current to
The collector-emitter of is in an OFF state, and the control means 1
The input terminal P1 of No. 9 is at logic level 1. Then, the control means 19 starts counting the time during which the input terminal P1 is at a logic level of 1, and when it continues for more than 600m5, the control means 19 sets the output terminal P2 to a logic level of 0, turns off the switching means 13, and opens the telephone line. to release the hold status. Here, the reason why a 600 m5 time delay is provided instead of responding immediately to a voltage drop in the telephone line is due to a voice signal with a relatively large amplitude or a momentary power outage (instantaneous power outage) of the line voltage.
This is to prevent malfunctions such as inadvertently canceling the hold state due to such reasons.
発明の効果
以上のように本発明は、保留時の電話回線の電圧に対応
する値を所定の時間保持する保持手段と、電話回線の電
圧と保持手段の電圧とを比較し電話回線の電圧の変化を
検出する検出手段と、検出手段からの検出信号により電
話回線を開放する保留回路手段とにより、保留解除を回
線電圧の変化を検出して行ない、通常の電話回線やＰＢ
Ｘ等回等電線電圧なる場合にもスイッチ等で切り換える
必要を無すことができ、その実用的効果は大なるものが
ある。Effects of the Invention As described above, the present invention includes a holding means for holding a value corresponding to the voltage of the telephone line during a hold state for a predetermined period of time, and a voltage of the telephone line by comparing the voltage of the telephone line and the voltage of the holding means. A detection means for detecting a change, and a holding circuit means for releasing a telephone line in response to a detection signal from the detection means, detect a change in the line voltage and release the hold from the normal telephone line or PB.
Even in the case where the wire voltage is equal to X times, there is no need to switch using a switch or the like, and this has a great practical effect.
第Ｎ図は、本発明の電話回線保留回路の一実施例を示す
ブロック図、第２図は従来例のブロック図である。
１．２−ｍ−電話回線への接続端子
３−一一−−−−ダイオードブリッジ
１３−−−ｍ−スイツチング手段
１４−一−−−コンデンサ
１５．１６．１７−抵抗器
１８−−−−− トランジスタ
１９−−−−一制御手段
２０−−−−一保留時に保留電流が流れる回路網２１−
−−−一保留スイッチ
第１図FIG. N is a block diagram showing an embodiment of the telephone line holding circuit of the present invention, and FIG. 2 is a block diagram of a conventional example. 1.2-m-connection terminals to the telephone line 3-11--diode bridge 13--m-switching means 14-1--capacitor 15.16.17-resistor 18-- - Transistor 19 - - Control means 20 - - Circuit network 21 through which a holding current flows during holding
---One hold switch Figure 1
Claims (1)
と、前記電話回線の電圧と前記保持手段に保持された電
圧とを比較し前記電話回線の電圧の変化を検出する検出
手段と、前記検出手段からの検出信号により前記電話回
線を開放する回路手段とを備えた事を特徴とする電話回
線保留回路。a holding means for holding the voltage of the telephone line for a predetermined period of time when the telephone line is on hold; a detecting means for detecting a change in the voltage of the telephone line by comparing the voltage of the telephone line and the voltage held by the holding means; A telephone line holding circuit comprising circuit means for releasing the telephone line in response to a detection signal from a detection means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61001701A JPH0732422B2 (en) | 1986-01-08 | 1986-01-08 | Telephone line hold circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61001701A JPH0732422B2 (en) | 1986-01-08 | 1986-01-08 | Telephone line hold circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62159959A true JPS62159959A (en) | 1987-07-15 |
| JPH0732422B2 JPH0732422B2 (en) | 1995-04-10 |
Family
ID=11508843
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61001701A Expired - Lifetime JPH0732422B2 (en) | 1986-01-08 | 1986-01-08 | Telephone line hold circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0732422B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62141244U (en) * | 1986-02-28 | 1987-09-05 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61163449U (en) * | 1985-03-25 | 1986-10-09 |
-
1986
- 1986-01-08 JP JP61001701A patent/JPH0732422B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61163449U (en) * | 1985-03-25 | 1986-10-09 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62141244U (en) * | 1986-02-28 | 1987-09-05 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0732422B2 (en) | 1995-04-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3794774A (en) | Telephone audio program system | |
| US4218590A (en) | Key telephone system having automatic exclusion circuit for line privacy | |
| US4645882A (en) | Latching relay drive circuit for use in telephone sets | |
| US4899372A (en) | Multi use telephone extension control circuit and device providing lockout for privacy | |
| US3870831A (en) | Telephone hold circuit | |
| US4467144A (en) | Telephone annuciator extender | |
| US4258232A (en) | Line hold circuits | |
| US3894187A (en) | Circuit for comparing at least two input signals to generate control signals | |
| JPS5955665A (en) | Telephone set speech/signal circuit | |
| US4440981A (en) | Electronic hold circuit | |
| CA1045215A (en) | Automatic disconnect circuit for subscriber carrier telephone system | |
| JPS62159959A (en) | Telephone line holding circuit | |
| US4435622A (en) | Latching relay hold circuit for a telephone instrument | |
| US4313037A (en) | Telephone station set with improved flash signalling | |
| US4164713A (en) | Dual mode telephone subscriber loop current detector | |
| US4454385A (en) | Latching relay hold release circuit for a telephone instrument | |
| US4447674A (en) | Electronic hold release circuit | |
| US4674118A (en) | Telephone line hold and hold release apparatus | |
| US4731827A (en) | Interswitch line circuit | |
| US4010332A (en) | Link circuit for intercom unit | |
| JPH06232966A (en) | Method for sensing off-hook of telephone subscriber terminal, and device therefor | |
| JPS6366109B2 (en) | ||
| JPH0326712Y2 (en) | ||
| JP2859908B2 (en) | Network controller | |
| KR100298344B1 (en) | Apparatus and method for detecting and displaying a level of battery in private exchange system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |