JPS6026336B2 - dial conversion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dial conversion device for connecting equipment that can dial only by dial pulse signals to a push-button dial telephone line.

[Prior Art] Conventionally, this type of dial converter has adopted a method in which the internal circuit of a device connected to a telephone line is modified to extract an internal signal, and the internal signal is converted into a push button dial signal.

[Problem that the invention seeks to solve]

For this reason, compatibility with conventional equipment has been lost, and maintenance has been extremely difficult because similar modifications have to be made and installed each time the printed circuit board of conventional equipment is replaced for repair or the like.

The present invention utilizes a conventional dial pulse telephone and (
or) It is an object of the present invention to provide a dial conversion device that connects as an interface between a telephone line and a push-button dial type telephone line so that various types of equipment can be used as is on the push-button dial type telephone line.

[Means for solving problems]

The present invention includes a first terminal for connecting to a push-button telephone line, a second terminal for connecting a dial pulse device, and a dial for converting an input dial pulse signal into the push-button dial signal and transmitting the signal. a line detection unit that detects that a device connected to the second terminal has established a line;
a call paper detection unit that detects a calling signal arriving at the first terminal; a storage unit that stores the output of the call detection unit for a certain period of time; connection control means for controlling the connection, the connection control means transmitting the input of the dial conversion section to the second terminal when an output is transmitted from the line detection section when there is no output from the storage section. and means for connecting the output of the dial conversion section to the first terminal; and means for nullifying this power even if the output is transmitted from the line detection section when there is an output from the storage section; The device is characterized in that it includes means for interconnecting the first terminal and the second terminal when a predetermined period of time has passed after no dial pulses arrive at the second terminal.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a connection diagram of a device according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a push-button dial type telephone line, to which a conventional device 3 using dial pulses as a selection signal and a telephone 4 that also uses dial pulses are connected via a conversion device 2 according to the present invention. This shows the connection state without any internal modifications. 1a and 1b are terminals for connecting telephone lines, 3a, 3b, 3c and 3d are terminals for connecting devices, and 4a and 4b are terminals for connecting telephones. Here, the device 3 is a security alarm device in this example, and when an alarm output is sent to the circuit being monitored, it automatically sends a dial signal to the telephone line.
This is a device that transmits the alarm output to a predetermined destination.

This device 3 is a known device. Furthermore, the telephone 4 is a telephone that is required to be connected to a telephone line when a device other than a telephone is connected according to the regulations of the Nippon Telegraph and Telephone Public Corporation, and the above-mentioned device may be disconnected from the line. However, the device must be configured so that it is always connected to the telephone line so that the telephone line will not be disconnected. Since the telephone line 1 is a push-button dial line, the telephone 4 is a push-button dial telephone. There is no direct functional relationship between this telephone 4 and the device 3. FIG. 2 shows a circuit configuration of a portion of this conversion device 2. As shown in FIG. Terminals la, lb,..., 4a
, 4b are the terminals la, lb,..., 4a shown in FIG.
, 4b. In FIG. 2, reference numeral 15 is a dial conversion unit, which counts dial pulses applied to its terminal P.
This is a known circuit configured to send a corresponding push button dial signal from terminal V. Conversion section 15
Terminal C indicates control input/output. Reference numeral 14 denotes a control section, in which a relay is used, and is connected to the control input/output C of the converting section 15, and also controls contacts 14a, 14b, 14c, and 14d connected to the converting section 15. It is configured. Terminals la and lb connected to the push-button dial telephone line are contacts 14c and 1
It is connected to terminals 3a and 3b via the make side contact point 4d.

A relay 6 is inserted into the terminal la, and is configured to detect the presence or absence of an open loop current flowing through the terminal la. The terminals la and lb are connected to the terminal V of the converter 15 via the terminals 14a and 14b, respectively. Also terminal la
, lb, a relay 7 is connected via a capacitor 5, and is configured so that an alternating current (calling signal) generated during this time can be detected. A terminal P of the converter 15 is connected to the break side contacts of the contacts 14c and 14d. On the other hand, terminals 3c and 3d are connected to terminals 4a and 4b, respectively, via an IJ relay 3 for detecting the presence or absence of a closed loop current.

In FIG. 2, 6a, 7a, and 8a are the contacts of the aforementioned relays 6, 7, and 8, respectively, and one side of each contact is connected to the power source terminal 9. The other side of the contact 7a is connected via the storage section 10, and the other side of the contact 8a is connected to the input of the direct/a circuit 11. The output of this NOR circuit 11 is a NAND circuit 12a constituting a flip-flop.
and 12b. Contact 6a
The other side of the flip-flop is connected to the other input of the flip-flop, and is also connected to the input of the fund circuit 13. The output of the flip-flop is connected to the other input of the AND circuit 13, and the output of the AND circuit 13 is connected to the control section 14 described above. Next, the operation of the apparatus will be explained with reference to FIG.

When device 3 closes telephone line 1, direct current flows to terminal la-
Relay 6 - Contact 14c - Terminal 3a - Device 3 - Terminal 3b -
It flows through the circuit between contact 14d and terminal lb, and relay 6 is activated. Activation of the relay 6 closes the contact 6a, and a voltage is applied to the NAND circuit 12b and the AND circuit 13 through the terminal 9 on the power supply side and the contact 6a. Since the relay 7 is not operating, the contact 7a remains open, and there is no output from the storage unit 10. Likewise, the relay 8 is also not operating, so the contact 8a remains open, and no voltage is applied to the /A circuit 11. .
Therefore, there is an output of NOR circuit 11, and NAND circuit 12
Since there is also an output of b, the AND circuit 13 outputs an output. The control unit 14 is activated by the output of the AND circuit 13, and the contact 14
a, 14b, 14c and 14d are switched. As a result, the telephone line 1 is connected to terminal la - relay 6 - contact 14a -
It is held in the circuit of converter 15-contact 14b-terminal lb. The ON-OFF signal of the dial pulse of the device 3 is transmitted from the terminal 3a to the contact 14c to the converter 15 to the contact 14d to the terminal 3b.
The signal is input to the dial conversion section 15 through the circuit shown in FIG. The ON-OFF signal of the dial pulse is converted into a push button dial signal by the dial conversion section 15 and sent to the telephone line 1. When the ON-OFF signal of the dial pulse disappears and a certain period of time has elapsed, the control unit 14 is restored, and the device 3 is connected to the telephone line 1 through the same route as at the time of initial activation, and enters a talking or communication state. Next, a case will be described in which a calling signal arrives from the telephone line 1 and the device 3 closes the telephone line 1.

At this time, the alternating current component of the calling signal flows through the path of terminal la - relay 6 - capacitor 5 - relay 7 - terminal lb, and relay 7 operates. Since the contact 7a is closed by the operation of the relay 7, the voltage at the terminal 9 on the side of the power source is inputted to the storage section 10' through the rear point 7a, and the output is maintained for a certain period of time. During this time, when the device 3 detects a calling signal and closes the telephone line 1, the contact 6a closes as described above, and voltage is applied to the NAND circuit 12b and the NAND circuit 13, but since there is an output from the storage section 10, Since there is no output from the N/A circuit 11, there is no output from the NAND circuit 12b. Therefore, there is no output from the AND circuit 13 and the control section 14 remains restored. Even if the output of the storage section 10 disappears, since the previous state is stored in the NAND circuits 12a and 12b, there is no output from the NAND circuit 12b and the control section 14 does not start up. Therefore, the device 3 continues the telephone line 1 and immediately becomes in a talking or communicating state. Next, a case where a telephone call is made using the telephone 4 will be explained.

The path through which the telephone 4 connects the telephone line is: terminal la - relay 6 - contact 14c - terminal 3a - device 3 - terminal 3c - relay 8 - terminal 4a - telephone 4 - terminal 4b - terminal 3a - device 3 - terminal 3b - Contact 14d - terminal lb. Therefore, the relay 6 and the relay 8 are activated, the contact 8a of the relay 8 is closed, and the control unit 14 is activated in the same way as when there is an output from the storage unit 10.
is not activated, so you can freely talk on the telephone 4. In the explanation, a relay is used as a detection circuit, but a circuit such as a transistor or a photocoupler may also be used. Also, to simplify the explanation, circuits such as resistors have been omitted.
Adding resistors and capacitors for operation compensation to eliminate malfunctions during transient periods does not impede the purpose of the present invention in any way.

In the above example, the device 3 is a security alarm device, but the present invention can be implemented in the same way with other devices that send out dial pulse signals.

〔Effect of the invention〕

As explained above, by using the present invention, a dial pulse type device can be connected to a push button dial type telephone line and used without making any modification to the main device.

[Brief explanation of the drawing]

FIG. 1 is a connection diagram of a device according to an embodiment of the present invention, and FIG. 2 is a circuit configuration diagram of a device according to an embodiment of the present invention. 1... Telephone line, la, lb... Terminal for connecting the telephone line, 2... Dial conversion device, 3
...Equipment, 3a, 3b, 3c, 3d...
・Terminal for connecting devices, 4...Telephone, 4a,
4b...Terminal for connecting the telephone, 5...
・Capacitor, 6, 7, 8...Relay, 6a,
7a, 8a... Relay contacts, 9... Power supply ■
Side terminal, 10... Storage section, 11... NOR circuit, 12a, 12b... NAND circuit, 13...
...AND circuit, 14...Control section, 15...
...Dial converter, V, P, C...Terminals of the dial converter. Old man figure 1 and figure 2

Claims (1)

[Claims] 1. A first terminal 1a connected to a push-button telephone line.
, 1b, second terminals 3a, 3b for connecting devices using dial pulses, and a dial conversion unit 15 for converting an input dial pulse signal into the push button dial signal and transmitting the signal. , a line detection section 6 that detects that a device connected to the second terminal has closed the line; a call detection section 7 that detects a call signal arriving at the first terminal; A storage section 10 stores the output of the section for a certain period of time, and a connection control means controls the connection of the dial conversion section and the first and second terminals, and the connection control means means for connecting the input of the dial conversion unit to the second terminal and connecting the output of the dial conversion unit to the first terminal when an output is transmitted from the line detection unit when there is no output; means for invalidating the output even if an output is transmitted from the line detection unit when there is an output from the storage unit, and when a certain period of time has elapsed after no dial pulses arrive at the second terminal; and means for interconnecting the first terminal and the second terminal.