JPH01215174A - Howler signal transmission system - Google Patents
Howler signal transmission systemInfo
- Publication number
- JPH01215174A JPH01215174A JP4022488A JP4022488A JPH01215174A JP H01215174 A JPH01215174 A JP H01215174A JP 4022488 A JP4022488 A JP 4022488A JP 4022488 A JP4022488 A JP 4022488A JP H01215174 A JPH01215174 A JP H01215174A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- polarity
- howler signal
- howler
- telephone set
- 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
- 230000008054 signal transmission Effects 0.000 title claims description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 10
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
Landscapes
- Devices For Supply Of Signal Current (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、加入者の送受話器の外し忘れに対して交換機
より送出するハウラー信号送出方式に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a howler signal transmission system that is transmitted from an exchange in response to a subscriber forgetting to take off the handset.
［従来の技術］
従来、加入者（電話機）の送受話器の外し忘れに対して
、交換機よりハウラー信号を送って加入者に警告を与え
ている。また、従来の方式では、上記の加入者線をリレ
ーによりハウラー信号送出回路に引込み、′！！報を段
階的に与えている。[Prior Art] Conventionally, if a subscriber (telephone) forgets to take off the handset, a howler signal is sent from an exchange to warn the subscriber. In addition, in the conventional system, the subscriber line mentioned above is connected to the Howler signal sending circuit by a relay, and '! ! information is provided in stages.
第２図は、その警報の段階を示すハウラー信号の送出レ
ベル図である。第２図において、縦軸は送出信号の振幅
を表わし、横軸は時間を表わす。FIG. 2 is a howler signal transmission level diagram showing the stages of the alarm. In FIG. 2, the vertical axis represents the amplitude of the transmitted signal, and the horizontal axis represents time.
Ａ、Ｂ、Ｃ，、、Ｈは警報の段階例を示すものである。A, B, C, . . . H indicate examples of alarm stages.
交換機は加入者の送受話器の外し忘れに対し、最初に小
振幅の送受話器を復旧させないと、逐次Ａ→ｎ＋ｃ、、
、と振幅を大きくして警告の段階をあげる。もし、最大
の警告Ｈを成る一定時間与えても加入者が送受話器を復
旧させない場合は、該加入者回路を切断するなどの非常
手段がとられる。When a subscriber forgets to take off the handset, the switching system must first restore the handset with a small amplitude, and the exchange will sequentially A → n + c, etc.
, increase the amplitude and raise the warning level. If the subscriber does not restore the handset even after giving the maximum warning H for a certain period of time, emergency measures such as disconnecting the subscriber's circuit are taken.
［発明が解決しようとする課ＷＵ］
しかし、従来のハウラー信号送出方式では、加入者線を
引込むためのリレーや、ハウラー信号発生回路が必要で
あり、そのため回路が複雑になるという欠点があった。[The problem WU that the invention seeks to solve] However, the conventional howler signal transmission system requires a relay for connecting subscriber lines and a howler signal generation circuit, which has the disadvantage that the circuit becomes complicated. .
［課題を解決するための手段］
上記従来の課題を解決する本発明のハウラー信号送出方
式は、電話機に直流電流を供給する加入者回路において
、極性反転回路をル制御して直流給電電流の極性を反復
反転し、直流供給抵抗を変化させる構成としている。[Means for Solving the Problems] The howler signal transmission system of the present invention which solves the above-mentioned conventional problems controls a polarity reversing circuit in a subscriber circuit that supplies DC current to a telephone set to change the polarity of the DC power supply current. is repeatedly inverted to change the DC supply resistance.
［実施例］
以下、本発明の一実施例について図面を参照して詳細に
説明する。[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.
第１図は本発明によるハウラー信号送出方式の一実施例
を示す回路図である。この第１図において、Ａ、Ｂは加
入者線に接続される加入者線端子、ｌは抵抗Ｒ１−Ｒ４
と差動増幅器ＯＰ１゜ＯＦ２で構成される電話機に直流
電流を供給する直流給電回路、２は抵抗Ｒ５〜Ｒ８と差
動増幅器ＯＰ３よりなるＡ、Ｂ端子間の電圧を検出する
差電圧検出回路、３は差電圧検出回路２の出力電圧を電
流に変換するＶＩ変換回路、４は直流給電回路から電話
機への電流供給の方向を反転するための極性反転回路で
ある。また、５は電話機である。FIG. 1 is a circuit diagram showing an embodiment of the howler signal sending system according to the present invention. In this Figure 1, A and B are subscriber line terminals connected to the subscriber line, and l is a resistor R1-R4.
and a differential amplifier OP1°OF2, which supply a direct current to the telephone; 2 is a differential voltage detection circuit that detects the voltage between terminals A and B, which is composed of resistors R5 to R8 and a differential amplifier OP3; Reference numeral 3 represents a VI conversion circuit for converting the output voltage of the differential voltage detection circuit 2 into a current, and reference numeral 4 represents a polarity inversion circuit for reversing the direction of current supply from the DC power supply circuit to the telephone set. Further, 5 is a telephone.
次に、本実施例の動作を説明する。Next, the operation of this embodiment will be explained.
電話ａ５に流れる電流をＩＬ、Ａ、Ｂ端子間電圧をＶＡ
８、Ｒ＋ ＝Ｒ２＝Ｒｒ 、Ｒ３＝Ｒａ ＝Ｒ。The current flowing through phone a5 is IL, and the voltage between A and B terminals is VA.
8, R+ = R2 = Rr, R3 = Ra = R.
ＶＩ変換回路３の変換係数をに、 Ｒｓ ＝Ｒｂ ＝Ｒ
７＝ＲＢ ７）Ｒｒ とすると、直流給電回路ｌの直流
給電抵抗ＲＤＣは次式で示される。The conversion coefficients of the VI conversion circuit 3 are as follows: Rs = Rb = R
7=RB7)Rr, the DC power supply resistance RDC of the DC power supply circuit l is expressed by the following equation.
通話時は、Ｒｏｃ＝４４０Ωに設定され電話機５に直流
電流が供給される０通話が終了し送受話器の外し忘れが
発生すると、極性反転制御端子より極性反転回路４を制
御し、Ａ、Ｂ端子の極性を反復反転（ハウラー信号周波
数）し電話ａ５にハウラー信号を送出する。During a call, Roc is set to 440Ω and direct current is supplied to the telephone 5.0 When a call ends and you forget to remove the handset, the polarity reversal circuit 4 is controlled by the polarity reversal control terminal, and the A and B terminals are It repeatedly inverts the polarity of (howler signal frequency) and sends a howler signal to telephone a5.
この時、変換係数制御端子よりＶＩ変換回路３の変換係
数Ｋ（小→大）を段階的に変え、ハウラー信号の送出レ
ベルを段階的に変化させる。すなわち、直流給電抵抗を
段階的に変化させることによって電話ａ１５でのハウラ
ー信号レベルを段階的に変化させることができる。At this time, the conversion coefficient K (from small to large) of the VI conversion circuit 3 is changed stepwise from the conversion coefficient control terminal, and the sending level of the Howler signal is changed stepwise. That is, by changing the DC feeding resistance in steps, the Howler signal level at the telephone a15 can be changed in steps.
［発明の効果］
以上説明したように本発明は、電話機に直流電流を供給
する加入者回路において、極性反転回路を制御して直流
給電電流の極性を反復反転し、直流供給抵抗を変化させ
ることにより、適切な警報音を加入者に与えることがで
きる。[Effects of the Invention] As explained above, the present invention controls a polarity reversal circuit in a subscriber circuit that supplies DC current to a telephone set to repeatedly reverse the polarity of the DC supply current and change the DC supply resistance. This allows an appropriate alarm sound to be given to the subscriber.
また、加入者（電話機）に直流電流を供給したり、給電
極性を反転する回路は、通常交換機の加入者回路に具備
されているので、特別な部品及び回路を追加することな
くハウラー信号を送出することができる。In addition, the circuits that supply direct current to subscribers (telephones) and reverse the feeding polarity are usually included in the subscriber circuit of the exchange, so howler signals can be sent out without adding any special parts or circuits. can do.
第１図は本発明によるハウラー信号送出方式の一実施例
を示す回路図、第２図はハウラー信号送出レベルを示す
図である。
ｌ：直流給電回路 ２：差電圧検出回路３：ＶＩ変換回
路 ４：極性反転回路
５：電話機 Ａ、Ｂ：加入者線端子ＲＩＮＲ８：
抵抗
ＯＦＩ〜ＯＰ３：差動増幅器FIG. 1 is a circuit diagram showing an embodiment of the howler signal sending system according to the present invention, and FIG. 2 is a diagram showing howler signal sending levels. l: DC power supply circuit 2: Differential voltage detection circuit 3: VI conversion circuit 4: Polarity inversion circuit 5: Telephone A, B: Subscriber line terminal RINR8:
Resistor OFI~OP3: Differential amplifier
Claims (1)
反転回路を制御して直流給電電流の極性を反復反転し、
直流給電抵抗を変化させることを特徴とするハウラー信
号送出方式。In a subscriber circuit that supplies direct current to a telephone set, a polarity inversion circuit is controlled to repeatedly invert the polarity of the direct current supply current,
A howler signal transmission method characterized by changing the DC power supply resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4022488A JPH01215174A (en) | 1988-02-23 | 1988-02-23 | Howler signal transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4022488A JPH01215174A (en) | 1988-02-23 | 1988-02-23 | Howler signal transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01215174A true JPH01215174A (en) | 1989-08-29 |
Family
ID=12574789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4022488A Pending JPH01215174A (en) | 1988-02-23 | 1988-02-23 | Howler signal transmission system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01215174A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5232210A (en) * | 1975-09-05 | 1977-03-11 | Hitachi Ltd | Detection system for subscriber response signal |
| JPS5994961A (en) * | 1982-11-22 | 1984-05-31 | Nippon Telegr & Teleph Corp <Ntt> | Talk current supply system |
-
1988
- 1988-02-23 JP JP4022488A patent/JPH01215174A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5232210A (en) * | 1975-09-05 | 1977-03-11 | Hitachi Ltd | Detection system for subscriber response signal |
| JPS5994961A (en) * | 1982-11-22 | 1984-05-31 | Nippon Telegr & Teleph Corp <Ntt> | Talk current supply system |
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