JPH11146040A - Ring signal detection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ring signal detection system where a ring signal detection section is shared in common by plural devices. SOLUTION: In the ring signal detection signal where plural sub devices 108 each employing a logical signal input section for its input side are connected in parallel with an output of a master set 102 whose output section is formed with a node A and using a ring signal detection section 116 for an input side by means of a cable 106, upon the receipt of a detection digital signal DS1 that is a detection signal of a ring signal RS1 by a counter circuit 112 in the ring signal detection section 116, a logic signal LS1 is distributed to a master set internal circuit 120 and a logic signal input circuit 122 in each sub device 108. According to the operation above, a ring signal on one line is shared in common by plural devices.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ring signal detection system, and more particularly to a ring signal detection system in which a plurality of devices share a ring signal on one line.

[0002]

2. Description of the Related Art In the field of information communication, which has been remarkably developed in recent years, it has become necessary to avoid the complexity of a network caused by diversification of communication modes and a sudden increase in the number of users. There is a demand for the development of technology for processing terminals. Under such circumstances, there is a need for a ring signal detection system that allows a plurality of devices to share a ring signal (call signal) on one line.

Conventionally, as such a ring signal detection system, for example, a ring signal detection system 30 shown in FIG.
0 has been implemented. FIG. 5 is a schematic configuration diagram of a conventional ring signal detection system 300.

The ring signal detection system 300 has a configuration in which a plurality of receivers 308-1 to 308-n are connected in parallel to one telephone line 302 via a connector 304 and a signal line 306. . The receiving device 308
Each of -1 to 308-n includes a ring signal detection circuit 310 and an internal circuit 312 which form the input side of each receiving device.

With this configuration, in the conventional ring signal detection system 300, the ring signal transmitted from the telephone line 302 to the ring signal detection system 300 is transmitted to the receiving device 30 via the connector 304 and the signal line 306.
8-1 to 308-n, and each receiving device adopts a configuration for detecting a ring signal.

[0006]

However, in the conventional ring signal detection system 300, the ring signals transmitted from one line are directly transmitted to each of the receiving devices 308-1 to 308-1.
In order to input the signal to 08-n, it was necessary to provide the ring signal detection circuit 310 for each receiving device.

The ring signal detection circuit 310 includes, for example, an analog-digital conversion circuit and a counter circuit. The ring signal detection circuit 310 including such circuit elements is installed in the receiving devices 308-1 to 308-n. This leads to an increase in the number of circuits and the number of components used in each receiving device. In other words, the construction of a ring signal detection system using a low-cost, small-sized device was a considerable negative factor.

Further, the conventional ring signal detection circuit 310
Many analog circuits, such as resistors, capacitors, rectifier diodes, and photocouplers, are generally provided inside. As a result, the conventional ring signal detection system 300
However, it takes time to evaluate the normality check against the JATE standard, and the increase in the time required for design cannot be avoided.

That is, according to the JATE standard which specifies the electrical conditions of a DC circuit when receiving a ring signal, the total capacitance of the DC circuit is 3 μF or less, and the total impedance is 2 kΩ with respect to 75 V, 16 Hz AC power. Must be at least. However, in the conventional ring signal detection system 300, the total capacitance and the total impedance change depending on the number of connected devices.

Therefore, in order to construct an appropriate ring signal detection system, for example, after carefully examining and evaluating the number and arrangement of devices, the constants such as the capacitance and impedance of each device are determined. Therefore, it is necessary to design a ring signal detection system. Conventionally, this study and evaluation required a certain amount of time.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the conventional ring signal detection system, and realizes a reduction in the initial cost of the components, simplification and miniaturization of the components, and a reduction in the manufacturing time. SUMMARY OF THE INVENTION It is an object of the present invention to provide a new and improved ring signal detection system having a short length.

[0012]

According to the first aspect of the present invention, a ring signal detecting section having a function of detecting a ring signal and a function of converting the ring signal into a logic signal is mainly provided. A logic signal (hereinafter, referred to as a "detection signal") indicating that a ring signal has been detected is distributed to the internal circuit of the main device and a plurality of sub-devices and output from the ring signal detector. The configuration is adopted.

According to this configuration, if only one ring signal detecting section is provided in the ring signal detecting system, the ring signal on one line can be shared by a plurality of devices. Accordingly, each device constituting the ring signal detection system can be simplified and miniaturized, and the time required to evaluate and evaluate the JATE standard can be reduced when designing the ring signal detection system. As a result, it is possible to realize a ring signal detection system that is inexpensive, small-scale, and requires relatively little time for construction.

According to a second aspect of the present invention, if the counter circuit is provided in front of the distribution point, the subsequent stage of the counter circuit transmits the ring signal if the detection signal of the ring signal is not received by the counter circuit a predetermined number of times. No signal is sent. Therefore, erroneous detection of the ring signal can be prevented, and malfunction of the ring signal detection system can be prevented.

Further, if the counter circuit is provided at the subsequent stage of the branch point, an individual operation can be performed for each device by changing the setting condition of each counter circuit.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a ring signal detection system according to the present invention will be described in detail with reference to the accompanying drawings. In the following description and the accompanying drawings, components having substantially the same functions and configurations are denoted by the same reference numerals, and redundant description will be omitted.

(First Embodiment) First, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic explanatory diagram showing the configuration of the ring signal detection system 100 according to the present embodiment, and FIG. 2 is a timing chart of transmission signals in the ring signal detection system 100.

First, the configuration of the ring signal detection system 100 will be described with reference to FIG. In the ring signal detection system 100, one telephone line 126 is connected via the connector 104 to the input side of the main device 102 that collectively receives the ring signal RS <b> 1 which is an analog signal.
Is connected. Further, on the output side of the main device 102, a plurality of sub devices 108-1 to 108-n are connected in parallel via a cable 106 which is a signal line.

In the main device 102, the analog side forms the input side of the main device 102.
A ring signal detection circuit 114 is formed by the digital conversion circuit 110 and a counter circuit 112 having an input connected to the digital side of the analog-digital conversion circuit 110.

Further, in the main unit 102, a ring signal detection section 116 is formed by the ring signal detection circuit 114 and the node A connected to the output section of the counter circuit 112 in the ring signal detection circuit 114.

In addition to the ring signal detection unit 116, the main unit 102 includes a logic signal output circuit 118 whose input unit is connected to the node A in the ring signal detection unit 116, and a logic signal output circuit 118. Main device internal circuit 120 independently connected to node A is provided. The logic signal output circuit 118 is composed of, for example, a driver circuit (a circuit having a signal amplifying function), and its output is connected to the cable 106 and forms the output side of the main device 102.

On the other hand, in the sub-devices 108-1 to 108-n, the input section forms the input side of each sub-device, and the sub-device internal circuit 124 Is connected.

Next, the operation of the ring signal detection system 100 according to the present embodiment configured as described above will be described with reference to FIG.

The analog-to-digital conversion circuit 110 includes:
When the ring signal RS1 transmitted from the telephone line 126 to the ring signal detection system 100 is received via the connector 104, the ring signal RS1 is converted into a detection digital signal DS1 which is a detection signal of the ring signal RS1, and is converted to the counter circuit 112. Send.

When receiving the detection digital signal DS1 a predetermined number of times, for example, five times, the counter circuit 112 transmits the logic signal LS1 to the node A. Further, the node A distributes the logic signal LS1 to the logic signal output circuit 118 and the main device internal circuit 120 and transmits the same.

The main device internal circuit 120 generates a logic signal LS1
Is received, the internal CPU is reset, and a predetermined operation such as generating a ringing tone is performed. on the other hand,
The logic signal output circuit 118 receives the received logic signal LS1
Is amplified and transmitted to the cable 106.

Further, the cable 106 has a logic signal LS
Is transmitted to the logic signal input circuit 122 of each of the sub-devices 108-1 to 108-n. Furthermore, the logic signal input circuit 122 converts the received logic signal LS1 into the sub-device internal circuit 1
24.

The sub-device internal circuit 124 has a logic signal LS1
Is received, the internal CPU is reset, and a predetermined operation such as generating a ringing tone is performed.

Next, the change of the transmission signal in the ring signal detection system 100 when the ring signal is detected will be described with reference to FIG.
This will be described with reference to FIG.

FIG. 2 shows a ring signal RS1 transmitted to the analog-digital conversion circuit 110, a detection digital signal DS1 transmitted from the analog-digital conversion circuit 110, and a logic signal LS1 transmitted from the counter circuit 112. 6 is a timing chart showing the relationship between the two.

First, the ring signal RS1, which is a pulse-like analog signal, is supplied to the analog-digital conversion circuit 110.
, A detection digital signal DS1 which is a pulsed digital signal having the same wavelength as the ring signal R1 is transmitted from the analog-digital conversion circuit 110. Further, when the detection digital signal DS1 transmitted from the analog-digital conversion circuit 110 is received by the counter circuit 112, for example, five times, the counter circuit 112 transmits an L-level logic signal LS1. Furthermore, when the logic signal LS1 is transmitted to the main device internal circuit 120 and the sub device internal circuit 124, the ring signal detection system 100
The ring signal detection can be confirmed.

As described above, in the ring signal detection system 100 according to the first embodiment, the ring signal RS1 transmitted from the telephone
02, since the ring signal detection circuit 110 is installed only in the main device 102, all devices in the system (the main device 102 and the sub devices 108-1 to 108-n)
Can confirm the detection of the ring signal.

Therefore, the sub-devices 108-1 to 108-
Since there is no need to install a ring signal detection circuit in n, the system configuration can be simplified and downsized. further,
Since there is no need to provide an analog circuit other than the main device 102, the JATE standard can be easily satisfied. As a result, by using the ring signal detection system 100 according to the present embodiment, it is possible to avoid the complexity of the ring signal detection system and the increase in the size of the constituent devices, and to prevent the design time of the ring signal detection system from being lengthened. Can be.

As means for distributing the detection digital signal DS1 in the main device, various means such as voltage detection and current detection can be considered.

(Second Embodiment) Next, a second embodiment of the present invention will be described.
The embodiment will be described with reference to FIGS. 3 and 4. FIG. FIG. 3 is a schematic explanatory diagram showing a configuration of the ring signal detection system 200 according to the present embodiment.
FIG. 4 is a timing chart of a transmission signal in the ring signal detection system 200.

First, the configuration of the ring signal detection system 200 will be described with reference to FIG. In the ring signal detection system 200, one telephone line 228 is connected via a connector 204 to an input side of a main device 202 that receives ring signals intensively. Further, on the output side of the main device 202, a plurality of sub devices 208-1 to 208-n are connected in parallel via a cable 206.

In the main unit 202, the analog side of the ring signal detection circuit 210 having the analog-digital conversion function forms the input side of the main unit 202. Furthermore, in the main device 202, a ring signal detection section 212 is formed by the ring signal detection circuit 210 and the node B connected to the output section of the ring signal detection circuit 210.

In addition to the ring signal detecting section 212, the main unit 202 includes a logical signal output circuit 214 whose input section is connected to the node B in the ring signal detecting section 212 and a logical signal output circuit 214. Main device counter circuit 216 independently connected on the input side to node B, and main device internal circuit 218 connected on the output side of main device counter circuit 216
And are provided. The logic signal output circuit 214
Is connected to a cable 206 as a signal line and forms an output side of the main device 202.

On the other hand, in each of the sub-devices 208-1 to 208-n, the sub-device counter circuit 222 is provided at the output of the logic signal input circuit 220 whose input section forms the input side of each sub-device. I have. Further, a sub-device internal circuit 224 is connected to the sub-device counter circuit 222.

Next, the operation of the ring signal detection system 200 according to this embodiment configured as described above will be described with reference to FIG.

First, when the ring signal detection circuit 210 receives the ring signal RS2 transmitted from the telephone line 226 through the connector 204, the ring signal detection circuit 210 converts the ring signal RS2 into a detection digital signal DS2 which is a detection signal of the ring signal RS2.
And transmits it to the node B. Further, Node B:
The detection digital signal DS2 is distributed to the logic signal output circuit 214 and the main device counter circuit 216 and transmitted.

When receiving the detected digital signal DS2 a predetermined number of times, for example, five times, the main unit counter circuit 216 outputs the L level logic signal LS2 to the main unit internal circuit 218.
Send to Further, upon receiving the logic signal LS2, the main device internal circuit 218 performs a predetermined operation such as resetting the internal CPU and generating a ringing tone.

On the other hand, the logic signal output circuit 214 transmits the received detection digital signal DS2 to the cable 206. Further, the cable 206 transmits the detected digital signal DS2 to the logic signal input circuit 220 of each of the sub devices 208-1 to 208-n. Furthermore, the logic signal input circuit 220 transmits the received detection digital signal DS2 to the sub device counter circuit 222.

When each of the sub-device counter circuits 222 receives the detection digital signal DS2 a predetermined number of times, for example, four times, it transmits an L-level logic signal LS3 to the sub-device internal circuit 224. Upon receiving the logic signal LS3, the sub-device internal circuit 224 performs a predetermined operation such as resetting the internal CPU and generating a ringing tone.

Next, the change of the transmission signal in the ring signal detection system 200 when the ring signal is detected will be described with reference to FIG.
This will be described with reference to FIG. FIG. 4 shows a ring signal RS2 transmitted to the ring signal detection circuit 210 and a detection digital signal DS2 transmitted from the ring signal detection circuit 210.
And the logic signal LS2 transmitted from the counter circuit 216
And the logic signal LS3 output from the counter circuit 222
6 is a timing chart showing the relationship between the two.

First, when the ring signal RS2, which is a pulse-shaped analog signal, is transmitted to the ring signal detection circuit 210, the detection digital signal DS2, which is a pulse-shaped digital signal having the same wavelength as the ring signal RS2, is detected. Sent from circuit 210. Further, when the detection digital signal DS2 is transmitted from the ring signal detection circuit 210 to the main device counter circuit 216, for example, five times, the logic signal LS2 of the L level is transmitted from the main device counter circuit 216. Furthermore, when the logic signal LS2 is transmitted to the main device internal circuit 218, the main device 202 can confirm the ring signal detection by the ring signal detection circuit 200.

On the other hand, when the detection digital signal DS2 is transmitted to the sub-device counter circuit 222, for example, four times, the counter circuit 222 transmits the L-level logic signal LS3. Furthermore, the logic signal LS3 is output from the sub-device internal circuit 2
When transmitted to the H.24, the ring signals detected by the ring signal detection system 200 can be confirmed by the sub devices 208-1 to 208-n.

As described above, if the ring signal detection system 200 according to the present embodiment is used, it is possible to reduce the size and simplification of each component of the system, and at the time of constructing the system, carefully follow the JATE standard. No consideration is required. Therefore, it is possible to realize a ring signal detection system that does not require much time for design and has a lower initial cost.

Further, in the ring signal detection system 200 according to the present embodiment, reception of a ring signal for each counter circuit (main device counter circuit 216 and each sub device counter circuit 222) is performed according to the purpose of use of each device. The number of times can be set. Therefore, if the ring signal detection system 200 is used, the ring signal on one line can be shared by various uses and types of devices.

Although the preferred embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to such configurations. Within the scope of the technical idea described in the appended claims, those skilled in the art will be able to conceive various changes and modifications, and those changes and modifications are also within the technical scope of the present invention. It is understood that it belongs to.

For example, in the above embodiment, a ring signal detection system using, for example, a driver circuit as a logic signal output circuit on the output side of the main device has been described as an example, but the present invention is limited to such a configuration. Not done. The present invention can be applied to a ring signal detection system using an output side of other various main devices, for example, a port or a buffer.

In the above embodiment, a ring signal detection system using, for example, a photocoupler as a logic signal input circuit on the input side of the sub device has been described. However, the present invention is limited to such a configuration. Not done. The present invention
The present invention can also be applied to a ring signal detection system using an input unit of various other sub devices, such as a port or a receiver circuit.

In the above embodiment, the ring signal detection circuit using the counter circuit which outputs the L level logic signal when the detection digital signal is received five times has been described as an example. It is not limited to such a configuration. The present invention provides a ring signal using a counter circuit that outputs an L-level logic signal when a detection digital signal is received other than five times, a counter circuit that outputs an H-level logic signal, and the like. It can also be applied to detection systems.

In the above-described embodiment, the ring signal detection system that finally uses the ring signal for resetting the CPU has been described as an example, but the present invention is not limited to this configuration. The present invention can also be applied to a ring signal detection system that uses a ring signal for various other uses.

[0055]

According to the present invention, even when a ring signal on one line is shared by a plurality of devices, it is not necessary to provide a ring signal detection circuit for each device. Therefore, it is possible to realize a ring signal detection system that is inexpensive, small, and has a short manufacturing time using a simpler device. Furthermore, a ring signal detection system that can be used for devices for various purposes can be realized only by adjusting the specification of a circuit installed inside the device.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory diagram showing a configuration of a ring signal detection system according to the present invention.

FIG. 2 is a diagram showing a timing chart of a transmission signal in the ring signal detection system shown in FIG.

FIG. 3 is a schematic explanatory diagram showing a configuration of a ring signal detection system according to the present invention.

4 is a diagram showing a timing chart of a transmission signal in the ring signal detection system 0 shown in FIG.

FIG. 5 is a schematic configuration diagram of a conventional ring signal detection system.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 ring signal detection system 102 main device 106 cable 108 sub device 112 counter circuit 116 ring signal detection unit 120 main device internal circuit 122 logic signal input circuit A node

Claims (3)

[Claims] A ring signal detection system for sharing a ring signal on one line among a plurality of devices, wherein the main device receives the ring signal intensively and a signal line connected to the main device. And one or more sub-devices connected to the main device and the received ring signal, which is provided in the main device, is converted into a logic signal, and the logic signal is converted into an internal circuit of the main device. A ring signal detection unit for distributing the signal to the signal line; a logic signal input circuit provided in each of the sub-devices, to which the logic signal output from the ring signal detection unit is input via the signal line; , A ring signal detection system. 2. The circuit according to claim 1, wherein a counter circuit for counting the logic signal is provided before a distribution point for distributing the logic signal to the internal circuit and the signal line. Ring signal detection system. 3. The circuit according to claim 1, further comprising a counter circuit that counts the logic signal at a stage subsequent to a distribution point that distributes the logic signal to the internal circuit and the signal line. Ring signal detection system.