JPS6248851A - Reply detector - Google Patents

Abstract

PURPOSE:To detect properly a reply of an opposite party without provision of a special reply tone transmission/reception circuit by outputting a reply signal from a timer circuit after a prescribed time after the end of dial in the mode no polarity inversion signal is supplied. CONSTITUTION:In the mode where a concerned exchange supplies no polarity inversion signal to the reply of opposite party, when an automatic dial circuit 7 dials a telephone number of an opposite subscriber number the control of a control section 1, the exchange rings a bell of the opposite telephone set. Then a timer circuit 27 of a reply detection section 13 supervises the dial operation of the circuit 7 to generate an output signal after a prescribed time after the end. The output signal is fed to a control section 11 as a reply signal Sa via a AND circuit 23 and a OR circuit 19 gates by the output of a mode setting circuit 15. The control section 11 uses the signal Sa to identify that the opposite subscriber and to operate changeover contacts 5a, 5b thereby switching the subscriber line 3 to a data transmitter 1, which performs data transmission to and from the opposite subscriber.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention is connected to a subscriber line of a telephone exchange, automatically dials the telephone number of a predetermined subscriber, and then dials the telephone number of the subscriber. The present invention relates to a response detection device for detecting.

[Technical Background of the Invention and Problems Therewith] There are various types of automatic calling devices that store the telephone number of a predetermined telephone subscriber in advance and automatically dial this telephone number to call the predetermined telephone subscriber. It is used for. FIG. 3 shows a combination of this automatic calling device and a data transmission device 1. In FIG.

That is, this data transmission device 1 is combined with an automatic calling device, that is, an automatic dialing circuit 7 in the figure, so that after the automatic dialing circuit 7 calls a predetermined telephone subscriber, data is exchanged with the called telephone subscriber. The transmission device 1 is intended to perform data transmission.

More specifically, in FIG. 3, telephone lines L1. A telephone line consisting of L2, that is, a subscriber line 3, is connected to the data transmission device 1 through make contacts 5a and 5b, and constitutes an automatic calling device through break contacts of the changeover contacts 5a and 5b. Automatic dialing circuit 7 is connected. This automatic dialing circuit 7 is controlled by a control section 51, and under the control of this control section 51, automatically dials the telephone number of a predetermined telephone subscriber in order to call the telephone subscriber,
This dial signal is switched to the switching contact 5a.

When sent to the telephone exchange via the break contact 5b and the subscriber line 3, the response of the dialed subscriber is monitored. This response from the other subscriber is detected by a response detection circuit 53 connected to the automatic dialing circuit 7.

When the telephone exchange receives the dialing signal from the calling subscriber, it selects the called subscriber according to the dial signal, sends a paging signal to the called subscriber, and rings the bell of the telephone of the called subscriber. . When the bell rings, the called party picks up the telephone handset and answers. The telephone exchange detects this response and connects the called subscriber to the calling subscriber, as well as reversing the polarity of the subscriber line 3 of the telephone exchange to which the calling subscriber is connected. In other words, in FIG. 3, a voltage of negative polarity is usually supplied to the telephone 1QL1, and a voltage of positive polarity is supplied to the telephone line L2 from the telephone exchange side. When the other subscriber is called and the other subscriber answers, the telephone exchange supplies the telephone line L1 with a positive polarity voltage, and the telephone line L1 . Reverse the voltage polarity of L2. This polarity reversal is normally performed for billing purposes in telephone exchanges, but this polarity reversal is detected by the response detection circuit 53, and the response detection circuit 53 sends the control section 51 to the called subscriber. is supplied as a response signal. The control unit 51 thereby switches to the switching point 5a.
, 5b is activated to disconnect the automatic dialing circuit 7 from the subscriber line 3 and connect the data transmission device @1 to each subscriber line 83. As a result, the data transmission device 1 is connected to the called subscriber dialed via the subscriber line 3, and data can be sent and received to and from the called subscriber.

By the way, in the above-mentioned device, the called subscriber responds by reversing the polarity of the subscriber line 3, but depending on the telephone exchange or its service capabilities, even if the called subscriber responds, the polarity reversal signal may not be sent. It may not be sent. Therefore, in such a case, the device shown in FIG. 1 described above cannot detect the response of the other subscriber.
The problem is that the above-mentioned device cannot be used in such telephone exchanges.

As a method for detecting the response of the other subscriber even when the polarity inversion signal is not sent, for example,
There is a method using response tones, as disclosed in US Pat. In this method, when the called subscriber answers, the device on the called subscriber's side sends out a response tone of an AC signal, and the calling subscriber's device detects this response tone, and the called subscriber's device detects the response tone. It detects the response.

However, even if you use answer tones in this way, if you are connected to the wrong party, you will not be able to detect the answer tone, and you will have to wait until you know that you are connected to the wrong party to receive the other party's answer tone. However, there is a problem in that during this time the telephone line is unnecessarily seized.

In addition, at telephone exchanges! The polarity reversal signal is used as a billing signal to the originating subscriber, but if there is no polarity reversal signal, the called subscriber on the receiving end may be billed for the call. . By the way, even though I called the called subscriber for whom the called party would be charged a call fee, I was mistakenly connected to another subscriber, and as a result, the exchange If an inverted signal is sent to the calling party, the problem arises that the calling party will be charged incorrectly for the call.

This erroneous billing will continue for a certain period of time until the mistake is noticed.

[Purpose of the invention]

The present invention has been made in view of the above, and an object thereof is to provide a response detection device that accurately detects the response of the other party.

[Summary of the invention]

To achieve the above object, the present invention provides a response detection device that is connected to a subscriber line of a telephone exchange and detects a response from the subscriber after dialing the telephone number of the subscriber. a polarity reversal detection circuit that detects an inverted signal; a delay circuit that generates an output signal after a predetermined time after dialing the telephone number of the predetermined other subscriber;
information setting means for setting information determined by a telephone exchange connected via the subscriber line regarding whether to supply a polarity inversion signal of the subscriber line in response to a response of the called subscriber; When the information setting means sets the information that an inverted signal will be supplied, the response of the other subscriber is detected by the polarity inversion detection signal of the polarity inversion detection circuit, and the information that the polarity inversion signal is not supplied is set by the information setting means. The main feature of the present invention is to include a response detection circuit that detects the response of the other subscriber based on the output signal of the extension circuit when the setting means has set the response.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is a circuit block diagram of a response detection device according to an embodiment of the present invention. In the figure, the data transmission device 1 and the automatic dialing circuit 7 are the same as those in FIG. , 5
b is switched to the data transmission device 1 side, and the data transmission device 1 performs data transmission with the called party via the subscriber line 3.

A polarity detection circuit 9 is connected to the automatic dialing circuit 7, which inverts the voltage polarity of the subscriber's line 3 when the other subscriber answers when the automatic dialing circuit 7 dials the telephone number of the other subscriber. is detected by the polarity detection circuit 9.

The polarity inversion signal detected by the polarity detection circuit 9 is supplied to the response detection section 13, and from this response detection section 13 the control 1
1! It is supplied to B11. The response detection unit 13 is also provided with a timer circuit 27, and the timer circuit 27 is directly supplied with a dialing end signal (or dialing signal) from the automatic Daicel circuit 7 indicating that the dialing operation has ended. This timer circuit 27 generates an output signal after a predetermined time delay after the automatic dialing circuit 7 completes the dialing operation. Therefore, if the timer circuit 27 is supplied with a dial end signal from the automatic dial circuit 7, it will generate an output signal a predetermined time after the dial end signal is supplied. The signal supplied to the circuit 27 may be a dial signal instead of the dial end signal; in this case, the timer circuit 27 receives the automatic dial signal 7.
is triggered every time it outputs a dial signal and generates a delay pulse of a predetermined time width, such as a retriggerable monostable multivibrator, and the automatic dial circuit 7
By outputting the output signal at the trailing end of the delayed pulse triggered by the last dialing signal from the dial, the output signal can similarly be generated after a predetermined time delay from the end of the dialing operation.

Further, the response detection section 13 is supplied with an output signal from the mode setting circuit 15. This mode setting circuit 15 is
This constitutes the information setting means of the present invention, and is information determined by the telephone exchange to which the present data transmission device 1 is connected via the subscriber line 3, that is, the affiliated telephone exchange, that is, the automatic dialing circuit. This sets information regarding whether or not to supply a polarity inversion signal of the subscriber line 3 in response to a response from the called subscriber called in step 7. That is, the mode setting circuit 15 is composed of a switch 29, one end of which is supplied with a voltage corresponding to a high logic level, and a resistor 31, the other end of which is connected to ground. When the associated telephone exchange supplies a polarity inversion signal to the subscriber line 3 in response to the caller's response, the switch 29 is set to the off state, that is, the open state, and as a result, the mode setting circuit 15 A low level signal is supplied to the response detection section 13. Further, if the associated telephone exchange does not supply a polarity inversion signal to the subscriber line 3 in response to a response from the other party, the switch 29 is set to the on state, that is, the closed state, and as a result, the mode setting circuit 15 outputs a high A level signal is supplied to the response detection section 13.

The response detection unit 13 includes an AND circuit 17.21 whose one input is connected to the output of the polarity detection circuit 9, and a timer circuit 27.
, an inverter 25 whose input is connected to the output of the mode setting circuit 15, and an OR circuit to which the output of the AND circuit 17.23 is supplied. ing. Also, AND circuit 1
The output of the inverter 25 is connected to the other input of the inverter 7,
The output of the mode setting circuit 15 is connected to the other inputs of the AND circuits 21 and 23, and the response signal Sa output from the OR circuit 19 and the connection signal sb output from the AND circuit 21 are supplied to the control section 11. ing.

FIG. 2 is a detailed circuit diagram of the polarity detection circuit 9.

Terminals S1 and S2 shown in the figure are an automatic dial circuit 7,
They are connected to subscriber lines 3, ie telephone lines Ll, 12, respectively, via switching contacts 5a, 5b. This polarity detection circuit 9 includes a diode 35 forming a bridge circuit.
, 37, 39, 41 and a relay 33 having two coaxially wound excitation windings 33a and 33b. Since the relay 33 has two excitation windings 33a and 33b wound on the same axis, each excitation winding 33a and 33
Each excitation winding 33a depends on the direction of the current flowing in b.

The relay 33 is configured such that the magnetic fluxes generated from the relays 33b are added together to cause the relay 33 to operate, or are canceled out so that the relay 33 does not operate. That is, when a negative voltage is supplied from the telephone exchange to the telephone line L1 and a positive voltage is supplied to the telephone line L2, the re-excitation winding 33a.

Since the magnetic fluxes generated from 33b cancel each other out, the relay 33 does not operate, but the exchange reverses the voltage polarity of the subscriber line 3, supplying a positive voltage to the telephone line L1 and a negative voltage to the telephone line L2. When supplied, the re-excitation winding 33
The magnetic fluxes of a and 33b are added, and the relay 33 operates,
A high level signal is output to the response detection section 13 through the contact (not shown).

The present response detection device is configured as described above.

Next, its effect will be explained.

First, a mode in which the affiliated telephone exchange supplies a polarity inversion signal in response to a caller's response will be explained.

In this mode, the switch 29 of the mode setting circuit 15 is set to the OFF state, and a low level signal is supplied from the mode setting circuit 15 to the AND circuits 21 and 23 of the response detection section 13 and the inverter 25. AND circuits 21 and 23 are inactive, and are inverted by inverter 25 and a high level signal is supplied to the other input of AND circuit 17.

In this state, when the automatic dialing circuit 7 automatically dials the telephone number of a predetermined subscriber under the control of the control unit 11, the exchange receives this dial, selects the subscriber, and dials the telephone number of the subscriber. ring the bell. When the other subscriber responds, the exchange number reverses the voltage polarity of the subscriber line 3. This polarity inversion signal is sent from the subscriber line 3 to the switching contact 5a.

5b, is supplied to the polarity detection circuit 9 via the automatic dial circuit 7, and the polarity detection circuit 9 detects this polarity inversion signal,
The AND circuit 17 of the detection unit 13 responds to the high level detection signal.
．． 21. As a result, this detection signal is supplied from the response detection section 13 to the control section 11 as a response signal Sa via the AND circuit 17 and the A/A circuit 19 which are gated by the high level output signal of the inverter 25. The control unit 11 uses this response signal Sa to identify that the other subscriber has responded, and operates the switching contacts 5a and 5b to switch the subscriber line 3.
is switched to the data transmission device 1, and the data transmission device 1 performs data transmission with the other subscriber.

Next, a mode in which the associated telephone exchange does not supply a polarity inversion signal in response to a caller's response will be described.

In this mode, the switch 29 of the mode setting circuit 15 is set to the on state, and a high level signal is supplied from the mode setting circuit 15 to the AND circuits 21, 23 and the inverter 25 of the response detecting section 13. AND circuits 21 and 23 are gated and inverted by inverter 25 to provide a low level signal to the other input of AND circuit 17, so that AND circuit 17 is inactive.

In this state, as described above, when the automatic dialing circuit 7 automatically dials the telephone number of a predetermined subscriber under the control of the control section 11, the exchange receives this dial and dials the telephone number of the subscriber. Select and ring that phone. Then, the other subscriber responds, but in this mode, the exchange does not supply a polarity inversion signal to the subscriber line 3, so the timer circuit 27 of the response detection section 13 monitors the dialing operation of the automatic dialing circuit 7. An output signal is generated after a predetermined time from the end of Daicel. In this case, the predetermined time for generating the output signal is the automatic dial circuit 7.
The time is set to be long enough to assume that the other party is answering after the end of the dialing operation and the start of calling the other party. It is determined that the other party has responded, and an output signal is output from the timer circuit 27 as a response signal from the other party. This output signal is gated by an AND circuit 23 and an OR circuit 19 gated by the output signal of the mode setting circuit 15.
The response signal Sa is supplied to the control unit 11 as a response signal Sa.

The control unit 11 identifies that the other subscriber has responded based on the response signal Sa, operates the switching contacts 5a and 5b to switch the subscriber line 3 to the data transmission device 1, and the data transmission device 1 connects the subscriber with the other subscriber. Perform data transmission.

In this mode, for example, if a polarity inversion signal is supplied from the exchange via [13] each time of joining,
This polarity inversion signal is detected by the polarity detection circuit 9, and this detection signal is supplied to the control section 11 via the AND circuit 21 of the response detection section 13 as the connection signal Sb. As a result, the control unit 11 knows that the subscriber line 3 is connected, and can immediately release the subscriber line 3, thereby preventing the subscriber line 3 from being grabbed unnecessarily.

In the above embodiment, since it is combined with the data transmission device 1, the automatic dialing circuit 7 is used to call the other subscriber, but the response detection device of the present invention is not limited to this. In addition, it is not necessarily necessary to use it in combination with the data transmission device 1, and it can be applied to various uses.

〔Effect of the invention〕

As explained above, according to the present invention, when the information setting means sets the information to supply a polarity reversal signal, the response of the called party is determined by the polarity reversal detection signal detected by the polarity reversal detection circuit. When information is set by the information setting means to detect and not supply a polarity inversion signal, after dialing the telephone number of a predetermined subscriber, an output signal outputted from a delay circuit after a predetermined period of time is used to detect the subscriber. Since the subscriber's response is detected, even if a polarity inversion signal is not supplied from the exchange, there is no need to provide a special response tone transmitting/receiving device, and the response of the other party can be accurately detected.

Furthermore, when the information setting means has set the information that the polarity inversion signal will not be supplied, if a wrong party contacts the user and supplies the polarity inversion signal, this is detected as a contact signal. Therefore, in such a case, even if the originating side attempts to charge the amount that would be charged to the called party, this can be immediately prevented by the disconnection signal.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram of a response detection device according to an embodiment of the present invention, FIG. 2 is a circuit diagram of a polarity detection circuit used in the response detection device of FIG. 1, and FIG. 3 is a conventional response detection circuit. FIG. 3 is a circuit block diagram of the device. 1...Data transmission device, 3...Subscriber line, 7...
・Automatic dial circuit, 9...Polarity detection circuit, 11...
-Control unit, 13...Response detection unit, 15...Mode setting circuit. Figure 1

Claims (2)

[Claims] (1) Polarity reversal detection that detects a polarity reversal signal of the subscriber line in a response detection device that is connected to the subscriber line of the telephone exchange and detects the response of the subscriber after dialing the telephone number of the subscriber. a delay circuit for generating an output signal after a predetermined period of time after dialing the telephone number of the predetermined called subscriber; information setting means for setting information determined by a telephone exchange connected via the subscriber line; and when the information setting means sets information to supply a polarity reversal signal, the polarity reversal; The response of the other party is detected by the polarity reversal detection signal of the detection circuit, and when the information setting means has set the information that the polarity inversion signal is not supplied, the response of the other party is detected by the output signal of the delay circuit. A response detection device comprising a response detection circuit that detects. (2) The response detection circuit outputs an erroneous connection signal when the polarity reversal detection circuit detects a polarity reversal signal when the information setting means has set information that the polarity reversal signal is not supplied. 2. The response detection device according to claim 1, further comprising a contact identification circuit.