JPH0154899B2 - - Google Patents
Info
- Publication number
- JPH0154899B2 JPH0154899B2 JP16792981A JP16792981A JPH0154899B2 JP H0154899 B2 JPH0154899 B2 JP H0154899B2 JP 16792981 A JP16792981 A JP 16792981A JP 16792981 A JP16792981 A JP 16792981A JP H0154899 B2 JPH0154899 B2 JP H0154899B2
- Authority
- JP
- Japan
- Prior art keywords
- coin identification
- circuit
- identification signal
- receiver
- wire
- 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
Classifications
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D5/00—Testing specially adapted to determine the identity or genuineness of coins, e.g. for segregating coins which are unacceptable or alien to a currency
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M17/00—Prepayment of wireline communication systems, wireless communication systems or telephone systems
- H04M17/02—Coin-freed or check-freed systems, e.g. mobile- or card-operated phones, public telephones or booths
- H04M17/023—Circuit arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Computer Security & Cryptography (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Meter Arrangements (AREA)
Description
【発明の詳細な説明】
本発明は時分割加入者線交換機における硬貨識
別信号用受信器の構成方式に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a system for configuring a receiver for coin identification signals in a time division subscriber line exchange.
従来の硬貨識別信号用受信器の構成方式を第１
図に示す。第１図は空間分割加入者線交換機にお
ける硬貨識別信号用受信器の構成方式の一例を示
すもので、１は街頭等に設置されて不特定多数の
大衆が10円、100円等の硬貨を投入して利用する
公衆電話機、２は該公衆電話機１と図示しない交
換機との間にあつて硬貨識別を行なう硬貨識別信
号用受信器（以下、受信器２と云う）である。こ
の受信器２は音声信号（0.3〜3.4kHz）より高い
周波数である硬貨識別信号（16kHz）に対し200
オーム終端および平衡不平衡変換機能を備えた回
路３、硬貨識別信号の検出回路４、および硬貨識
別信号の後位への伝送を防ぐ阻止回路５とより構
成されている。又、６は加入者回線を介して図示
しない多数の公衆電話機および図示しない一般単
独電話機等を収容している集線装置であつて、前
記公衆電話機１から受信器２への線路を集線する
装置である。更に、７は前記公衆電話機１に通話
電流を供給する通話電流供給回路であり、音声信
号および硬貨識別信号に対して十分高インピーダ
ンスを持つている。８は直流阻止用のコンデンサ
である。 The first configuration method of the conventional coin identification signal receiver
As shown in the figure. Figure 1 shows an example of the configuration of a receiver for coin identification signals in a space-division subscriber line exchange. A public telephone set 2 to be used is a coin identification signal receiver (hereinafter referred to as receiver 2) that is located between the public telephone set 1 and an exchange (not shown) and performs coin identification. This receiver 2 has a frequency of 200kHz for the coin identification signal (16kHz), which has a higher frequency than the audio signal (0.3~3.4kHz).
It is composed of a circuit 3 having an ohmic termination and a balance/unbalance conversion function, a coin identification signal detection circuit 4, and a blocking circuit 5 that prevents the coin identification signal from being transmitted to a subsequent stage. Further, 6 is a line concentrator that accommodates a large number of public telephones (not shown) and general standalone telephones (not shown) via subscriber lines, and is a device for concentrating lines from the public telephone 1 to the receiver 2. be. Furthermore, 7 is a communication current supply circuit that supplies communication current to the public telephone 1, and has sufficiently high impedance for voice signals and coin identification signals. 8 is a capacitor for blocking direct current.
次に、以上の構成における動作について説明す
る。公衆電話機１の使用による硬貨投入により、
該公衆電話機１からはあらかじめ設定されている
16kHzの硬化の種類に応じた硬貨識別信号が加入
者線、集線装置６を経て送出される。受信器２で
は、前記公衆電話機１から送出された硬貨識別信
号を受信すると、該信号を回路３により200オー
ム終端し、同時に平衡不平衡変換する。次いで、
前記変換した信号は検出回路４に入力されて硬貨
識別信号が検出され、投入硬貨の識別が行なわ
れ、必要な制御がなされる。なお、この時、前記
200オーム終端された硬貨識別信号は阻止回路５
により抑圧され、後位には伝送されない。 Next, the operation in the above configuration will be explained. By inserting coins using public telephone 1,
It is set in advance from the public telephone 1.
A 16 kHz coin identification signal corresponding to the type of hardening is sent out via the subscriber line and line concentrator 6. When the receiver 2 receives the coin identification signal sent from the public telephone 1, the signal is terminated at 200 ohms by the circuit 3, and at the same time, the signal is subjected to balanced/unbalanced conversion. Then,
The converted signal is input to the detection circuit 4, a coin identification signal is detected, the inserted coin is identified, and necessary control is performed. In addition, at this time, the above
The coin identification signal terminated with 200 ohm is blocked by the blocking circuit 5.
The signal is suppressed and is not transmitted to subsequent parts.
次いで、上述の投入硬貨の識別後における通
話、換言すると、発呼者（硬貨投入者）の音声信
号についてみると、音声信号は回路３により十分
高いインピーダンスで終端され、阻止回路５によ
り抑圧されることなく直流阻止用のコンデンサ８
を経由して後位に伝送され、交換機を介して図示
しない被呼者との通話が行なわれるのである。 Next, regarding the telephone conversation after the above-mentioned identification of the inserted coin, in other words, the voice signal of the caller (coin inserter), the voice signal is terminated with a sufficiently high impedance by the circuit 3 and suppressed by the blocking circuit 5. DC blocking capacitor 8
The message is then transmitted to the subsequent device via the exchange, and a conversation with a called party (not shown) is made via the exchange.
以上の説明から明らかなように従来の硬貨識別
信号用受信器の構成方式では、受信器が加入者
線、換言すると、２線側に構成されており、次の
ような欠点を有するものである。すなわち、２線
側はその構成上、平衡系で、高耐圧系であり、し
かも通話電流は重畳されるので、前記受信器を能
動回路で構成し、小形化、軽量化、および経済化
を図ることは、前記構成に伴なう対地不平衡減衰
特性、挿入損失特性、回路構成部品の素子耐圧、
消費電力等の各種特性の面で困難があつた。 As is clear from the above explanation, in the conventional configuration method of a coin identification signal receiver, the receiver is configured on the subscriber line, in other words, on the 2-line side, and has the following drawbacks. . That is, the two-wire side is a balanced system with a high withstand voltage system due to its configuration, and since the communication current is superimposed, the receiver is configured with an active circuit to make it smaller, lighter, and more economical. This means that the ground unbalance attenuation characteristics, insertion loss characteristics, element withstand voltage of circuit components,
There were difficulties in terms of various characteristics such as power consumption.
このため、前記特性上の問題から受信器の構成
をＬ、Ｃ等の受動部品を用いることが考えられる
が、この場合には形状が大きく、又、重量も増す
等の実装上の制約が大きく、経済化を図るにも限
度があつた。 Therefore, due to the above-mentioned characteristic problems, it is possible to use passive components such as L and C in the receiver configuration, but in this case, there are large mounting constraints such as a large size and an increase in weight. However, there were limits to how much economical efforts could be made.
本発明はこのような点に鑑み、しかも現在開発
途上にある時分割交換機に用いることの出来る硬
貨識別信号用受信器の構成方式を提供可能とした
ものである。すなわち、時分割加入者線交換機に
おける加入者回路の具備機能の１つである２線−
４線変換、および平衡不平衡機能を実現するため
のハイブリツドトランスを利用したもので、この
ハイブリツドトランスの４線側が、不平衡で、低
耐圧系であり、かつ通話電流がないため能動回路
で構成するのに適しているのに着目し、硬貨識別
信号用受信器を上記４線側に構成したものであ
る。このように構成したことにより、硬貨識別信
号用受信器を従来のそれと較べて小形化、軽量
化、および経済化を可能とした硬貨識別信号用受
信器の構成方式を提供できるのである。以下、図
を用いて本発明を説明する。 In view of these points, the present invention has made it possible to provide a system for configuring a coin identification signal receiver that can be used in a time-division exchange that is currently under development. In other words, the 2-wire line, which is one of the functions of the subscriber circuit in the time-division subscriber line exchange,
It uses a hybrid transformer to realize 4-wire conversion and balanced/unbalanced functions.The 4-wire side of this hybrid transformer is unbalanced, has a low withstand voltage system, and has no talking current, so it is configured with an active circuit. The receiver for the coin identification signal is arranged on the above-mentioned 4-wire side, since it is suitable for With this configuration, it is possible to provide a configuration system for a coin identification signal receiver that can be made smaller, lighter, and more economical than conventional coin identification signal receivers. Hereinafter, the present invention will be explained using figures.
第２図は本発明に係る硬貨識別信号用受信器の
構成方式の第１の実施例を示す図である。図にお
て、２１は時分割交換機における加入者回路の具
備機能の１つである２線−４線変換および平衡不
平衡機能を実現するハイブリツドトランスで、そ
の２線側の加入者回線には図示するように第１図
と同様に公衆電話機１、それと並列に通話電流供
給回路７および直流阻止用コンデンサ８を接続し
ている。又、その４線側には、図示するように、
接地形であつて音声信号より高い周波数である硬
貨識別信号（16kHz）に対し200オームの終端回
路２２、第１図と同様の検出回路４、阻止回路５
より構成されている硬貨識別用受信器（以下、受
信器と云う）２３を接続し、更には、通話の際の
音声の廻り込みにより生じる鳴音防止を図る為の
バランシングネツトワーク２４を接続している。 FIG. 2 is a diagram showing a first embodiment of the configuration of a coin identification signal receiver according to the present invention. In the figure, 21 is a hybrid transformer that realizes 2-wire to 4-wire conversion and balanced/unbalanced functions, which are one of the functions of the subscriber circuit in a time division switch. As shown in the figure, a public telephone 1 is connected in parallel with a telephone current supply circuit 7 and a DC blocking capacitor 8, as in FIG. Also, on the 4th line side, as shown in the figure,
A 200 ohm termination circuit 22 for the coin identification signal (16 kHz), which is a ground plane and has a higher frequency than the audio signal, a detection circuit 4 similar to that in FIG. 1, and a blocking circuit 5.
A coin identification receiver (hereinafter referred to as the receiver) 23 consisting of the ing.
次に、以上の構成についてその動作を説明す
る。第１図の場合と同様にして公衆電話機１から
の硬貨識別信号が加入者線を介して加入者回路に
送出されると、該加入者回路では、その硬貨識別
信号をハイブリツドトランス２１により２線−４
線変換および平衡不平衡変換して受信器２３に送
る。次いで、受信器２３では、前記変換した硬貨
識別信号を受信すると、先ず終端回路２２で終端
し、検出回路４により硬貨識別を行い、必要な制
御がなされるのである。なお、この時の終端され
た前記硬貨識別信号は阻止回路５の働きにより抑
圧され、後位には伝送されない。 Next, the operation of the above configuration will be explained. When the coin identification signal from the public telephone 1 is sent to the subscriber circuit via the subscriber line in the same way as in the case of FIG. -4
The signal is subjected to line conversion and balanced/unbalanced conversion and sent to the receiver 23. Next, when the receiver 23 receives the converted coin identification signal, it is first terminated at the termination circuit 22, and the detection circuit 4 performs coin identification and performs necessary control. Incidentally, the terminated coin identification signal at this time is suppressed by the action of the blocking circuit 5 and is not transmitted to the subsequent stage.
又、上記動作後における通話動作、換言する
と、音声信号は終端回路２２により高インピーダ
ンスで終端され、阻止回路５により抑圧されるこ
となく後位に伝送されるのである。 Further, the telephone call operation after the above operation, in other words, the voice signal is terminated at high impedance by the termination circuit 22, and is transmitted to the subsequent stage without being suppressed by the blocking circuit 5.
ここで、以上述べて来た硬貨識別信号が200オ
ームで終端される原理についてみてみる。第２図
に示すように終端回路２２の入力インピーダンス
をＺ、該終端回路２２より後位の入力インピーダ
ンスをZOとすると、ハイブリツドトランス２１の
２線側からみた入力インピーダンスZIは、該ハイ
ブリツドトランス２１の自己インダクタンスが十
分大きいとして、
ZI＝〔（Ｚ＋Ｚ）ZO〕／n2 ……(1)
で表わされる。なお、(1)式におけるｎはハイブリ
ツドトランス２１の２線側と４線側の巻数比であ
る。又、(1)式において、0.3〜3.4kHzの音声信号
に対して入力インピーダンスＺがZOより十分大き
くなるような線路条件の設定から音声信号入力時
の入力インピーダンスZIは
ZI＝ZO／n2 ……(2)
となり、該(2)式の右辺は通常600オームに設定さ
れている。一方、硬貨識別信号（周波数16±0.1k
Hz）に対してあらかじめ入力インピーダンスＺ＝
ZO／４になるように回路構成としておけば、該硬
貨識別信号入力時の入力インピーダンスZIは、上
記Ｚ＝ZO／４を(1)式に代入することにより、
ZI（ZO／n2）／３ ……(3)
となる。したがつて、ZO／n2は上設の如く600オ
ームであるので、入力インピーダンスZIは
ZI＝600オーム／３＝200オーム
となるのである。 Let's now take a look at the principle by which the coin identification signal described above is terminated with 200 ohms. As shown in FIG. 2, if the input impedance of the termination circuit 22 is Z, and the input impedance after the termination circuit 22 is ZO , then the input impedance Z I of the hybrid transformer 21 as seen from the two-wire side is Assuming that the self-inductance of 21 is sufficiently large, it is expressed as Z I = [(Z + Z) Z O ]/n 2 ...(1). Note that n in equation (1) is the turns ratio between the 2-wire side and the 4-wire side of the hybrid transformer 21. In addition, in equation (1), the input impedance Z I at the time of audio signal input is Z I = Z O by setting the line conditions such that the input impedance Z is sufficiently larger than Z O for the audio signal of 0.3 to 3.4 kHz. /n 2 ...(2), and the right side of equation (2) is usually set to 600 ohms. On the other hand, the coin identification signal (frequency 16±0.1k
Hz), input impedance Z=
If the circuit is configured such that Z O /4, the input impedance Z I at the time of inputting the coin identification signal can be calculated as Z I ( Z O /n 2 )/3 ...(3). Therefore, since Z O /n 2 is 600 ohms as stated above, the input impedance Z I is Z I =600 ohms/3=200 ohms.
第３図は本発明の他の実施例を示すものであ
る。ここでは、第２図で述べた接地形の終端回路
２２を、非接地形の終端回路３１に置き換えたも
ので、その動作は第２図の場合と同様に行なわれ
る。又、この実施例の場合も前記(1)式は成立す
る。 FIG. 3 shows another embodiment of the invention. Here, the grounded termination circuit 22 described in FIG. 2 is replaced with a non-grounded termination circuit 31, and its operation is the same as in the case of FIG. Also, in this embodiment, the above equation (1) holds true.
なお低周波の音声信号と高周波の硬貨識別信号
とで終端インピーダンスを変える理由は、加入者
線路の特性インピーダンスが周波数により変化す
るため、これに合せて終端インピーダンスを変え
ることにより、それぞれの周波数でインピーダン
スをマツチングさせ、伝送損失を最小にすること
ができるからである。 The reason why the termination impedance is changed between the low-frequency audio signal and the high-frequency coin identification signal is that the characteristic impedance of the subscriber line changes depending on the frequency, so by changing the termination impedance accordingly, the impedance at each frequency can be changed. This is because transmission loss can be minimized by matching.
以上詳述したように本発明によれば、時分割加
入者線交換機における加入者回路の具備機能の１
つを実現するために配されているハイブリツドト
ランスを利用し、その４線側に硬貨識別用受信器
を構成、換言すると、４線側が不平衡で、低耐圧
であり、しかも通話電流がないので能力回路で構
成できるので、従来のＬ、Ｃ等の受動回路で構成
されたものと較べ、小形軽量化および経済化する
ことが可能となり、時分割加入者線交換機に広く
適用できる優れた効果が期待できるのである。 As described in detail above, according to the present invention, one of the functions provided in the subscriber circuit in the time division subscriber line exchange is
In other words, the 4-wire side is unbalanced, has a low withstand voltage, and has no communication current. Since it can be configured with a power circuit, it can be made smaller, lighter and more economical than a conventional circuit configured with passive circuits such as L and C, and has excellent effects that can be widely applied to time-sharing subscriber line exchanges. We can expect it.
第１図は従来の空間分割加入者線交換機におけ
る硬貨識別信号用受信器の構成方式の一例を示す
図であり、第２図、第３図は各々本発明に係る硬
貨識別信号用受信器の構成方式の実施例を示す図
である。
１は公衆電話機、２，２３は硬貨識別信号用受
信器、３は回路、４は検出回路、５は阻止回路、
６は空間分割集線装置、７は通話電流供給回路、
８は直流阻止コンデンサ、２１はハイブリツドト
ランス、２２，３１は終端回路、２４はバランシ
ングネツトワークである。
FIG. 1 is a diagram showing an example of the configuration of a coin identification signal receiver in a conventional space division subscriber line exchange, and FIGS. 2 and 3 are diagrams showing a coin identification signal receiver according to the present invention. FIG. 3 is a diagram illustrating an example of a configuration method. 1 is a public telephone, 2 and 23 are coin identification signal receivers, 3 is a circuit, 4 is a detection circuit, 5 is a blocking circuit,
6 is a space division concentrator, 7 is a communication current supply circuit,
8 is a DC blocking capacitor, 21 is a hybrid transformer, 22 and 31 are termination circuits, and 24 is a balancing network.
Claims (1)
を接続する加入者回路において、 ２線平衡信号と４線不平衡信号に相互に変換す
るハイブリツドトランスの４線側に公衆電話機に
対する硬貨識別信号用受信機を接続し、 前記硬貨識別信号用受信器が実現する終端イン
ピーダンスが低周波の音声信号では高インピーダ
ンスになり、かつ高周波の硬貨識別信号では所定
のインピーダンスに変化する能動回路で構成した
ことを特徴とする硬貨識別信号用受信器の構成方
式。[Claims] 1. In a subscriber circuit that connects a time division subscriber line exchange and a two-wire subscriber line, the four-wire side of a hybrid transformer that mutually converts a two-wire balanced signal and a four-wire unbalanced signal. A coin identification signal receiver for a public telephone is connected to the terminal, and the terminal impedance realized by the coin identification signal receiver becomes high impedance for low frequency voice signals and changes to a predetermined impedance for high frequency coin identification signals. A configuration method for a coin identification signal receiver, characterized in that it is configured with an active circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16792981A JPS5870693A (en) | 1981-10-22 | 1981-10-22 | Constituting system for receiver for coin discriminating signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16792981A JPS5870693A (en) | 1981-10-22 | 1981-10-22 | Constituting system for receiver for coin discriminating signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5870693A JPS5870693A (en) | 1983-04-27 |
| JPH0154899B2 true JPH0154899B2 (en) | 1989-11-21 |
Family
ID=15858669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16792981A Granted JPS5870693A (en) | 1981-10-22 | 1981-10-22 | Constituting system for receiver for coin discriminating signal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5870693A (en) |
-
1981
- 1981-10-22 JP JP16792981A patent/JPS5870693A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5870693A (en) | 1983-04-27 |
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