JPH0983660A - No-ringing communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect a call originator number even halfway and to quickly identify whether or not the call originator is the specified one by permitting a detecting means to have synchronization by means of the change of a bit which is added in a call originator number and reading the call originator number. SOLUTION: When a pole reverse signal which is transmitted from an exchange to a terminal side system 4 by starting a center side system 7 is detected by a pole reverse detecting part 13, a control part 19 sets the interruption of an input port in the both edges of a bit change point. The change point A of a call originator number signal is detected by interruption. A half bit time is set in a timer with the point A as a synchronization point. At time-up in the timer, the bit is read with the point B as a bit center. The timer in the control part 19 is cleared from the point B so as to set one bit time and the bit of the point C is read by sampling at every time-up in the timer. Detected bit data is stored in RAM in the control part 19. A processing is completed when the carrier of an FSK signal used in the modulation of the call originator number signal is exhausted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a no ringing communication system for transmitting data by no ringing communication using a telephone line.

[0002]

2. Description of the Related Art A conventional no-ringing communication system is
It is connected by a telephone line network through an exchange equipped with a no-ringing trunk, and data is transmitted between the center side system and the terminal side system without ringing the telephone bell of a home. The no ringing trunk is
A gentle polarity reversal is performed to prevent the phone from "ringing" and at the same time an NRS signal (DTMF signal) is sent to select one of several home appliances.

However, in such a system using a no ringing trunk, the usage charge of the telephone line is high. In addition, equipment such as no-ringing trunk is often not installed at the exchange, and even if an application is made, it may take a considerable amount of time to be installed. Further, since the no-ringing trunk constantly sends out the NRTS, the communication speed cannot be increased, and there are various problems that the communication signal becomes congested when the number of telephone lines used at the same time is large.

Therefore, the applicant of the present invention has filed Japanese Patent Application No. 5-2528.
No. 84 proposed a no-ringing communication system for performing no-ringing communication between a center side system and a terminal side system without using a no ringing trunk.

In this no-ringing communication system, a telephone line is connected to a control device provided in a terminal device, and a paging signal (ringer) sent from an exchange and a dwell period of the paging signal are activated by the control device when the center side system is activated. The caller ID signal in the form of a telegram inserted in is detected. Then, the caller number is obtained by detecting the caller number, compared with the caller number registered in advance, and when it is identified as a specific caller (center system), the control device is connected to the rear side. It receives the call without sending the ringer to the telephone and communicates with the center side system. If it is not a specific party, the telephone line is connected to the telephone.

[0006]

By the way, the order of the caller number signal and the ringer sent to the terminal side system is usually such that the polar signal is transmitted first, and then the ringer and the caller number signal are transmitted in this order. Although it is configured, the caller ID signal and the ringer's arrival timing are actually random. In addition, the caller number signal often comes from the middle.

In the above-mentioned no-ringing communication system, as a method of detecting the caller number signal, the caller number is read in synchronization with the trailing edge of the mark of the caller number signal, that is, the start bit. Therefore, if the caller number signal comes from the middle as described above, that is, from the back of the start bit of the message forming the caller number, the caller number cannot be detected due to lack of synchronization, and the caller number is transmitted next. You have to wait for the caller ID. Furthermore, the ringer is configured not to be sent to terminal devices such as telephones connected after the line terminal device until the caller number is accurately detected. Therefore, it operates by counting the number of ringers such as answering machines. Sometimes, the Ringer's count would go wrong if he was connected.

Further, when trying to send a signal to the other party at the telephone installation place in the home depending on the number of ringers, there is a problem that the signal may not be transmitted when the ringer count is wrong. for that reason,
Originally, the no-ringing communication system is a system that performs meter readings of gas meters and the like without affecting ordinary telephones, but it adversely affects ordinary telephones.

In view of the above, the present invention makes it possible to detect the caller number even in the middle of the caller number signal, and does not reduce the number of ringers by judging whether or not the caller is a specific caller at an early stage. There is provided a no ringing communication system for the purpose.

[0010]

Is the means for solving the problem according to the present invention a detection means for detecting a caller number signal sent from an exchange and a call from the center side system based on the detected caller number signal? Communication means is provided for identifying whether or not there is no ringing communication when the call originates from the center side system, and the detecting means synchronizes with the change in the bit included in the caller number signal to read the caller number. Then, the bit string of the read caller number is converted into a character from the end, and the character is compared with the registered caller number. Further, setting means for setting whether or not to send the ringer to the terminal device may be provided regardless of whether or not the caller number signal is detected.

Thus, the caller number can be detected even in the middle of the caller number signal, and the caller number detected in the middle and a part of the registered caller number are compared and identified. This makes it possible to detect early whether or not the registered caller ID. Further, even if the caller number acquisition fails, the ringer can be sent to the telephone by setting the setting means to send the ringer to the telephone regardless of the presence or absence of the caller number signal. .

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 2, a no-ringing communication system of the present invention is a terminal side system 4 in which a telephone 2 and a telegram meter 3 are connected to a plurality of terminal devices 1.
And the center side line terminal device 6 on the host computer 5.
The center side system 7 connected to the
It is connected by the telephone line network through the exchange.

In the terminal device 1, as shown in FIG.
A code setting unit 10 configured by a semiconductor memory or a DIP switch for registering the caller number of the center side system 7 which is a communication partner, a dial unit 11 for making a call from the terminal device 1 itself, and a terminal side exchange. 9, a modem section 12 for detecting a device selection signal composed of a caller number signal sent from 9 and a PB signal or FSK signal sent from the center side system 7, and a polar anti-detection section 13 for detecting a polar signal. A call signal detection unit 14 for detecting a ringer, and a switch switching unit 15 for connecting or disconnecting the telephone 2 to / from the telephone line for transmitting the ringer to the telephone 2 when the call is not made from the center side system 7. The meter interface unit 16 for transmitting the meter reading data of the gas meter or the water meter and the connected terminal device The line off-hook detection unit 17 which detects the-hook, off-hook detection unit 18 in which any of the connected terminal equipment having a function of detecting a use state of the function and the telephone set 2 to detect it when you hook,
A control unit 19 including a CPU, a memory such as a ROM and a RAM for performing task processing, and a high-precision timekeeping unit 20 as a timer and a clock are provided. And 1
The telephone 2 is connected to only one terminal device 1, and the other terminal device 1 is provided with a connection terminal so that the telephone 2 can be connected.

The control unit 19 detects the function of disconnecting the telephone line from the telephone 2, the caller number signal sent from the exchange, the device selection signal, the ringer, and the off-hook of the terminal device connected in parallel to the same line. In addition, it has a function to identify whether it is a call from a specific center side device by the detected caller number or control signal, and it is connected when it is identified as a call from a specific center side device. The off-hook off-hooking no-ringing communication with the disconnected telephone 2 disconnected, the function of detecting when any of the terminal devices connected in parallel goes off-hook, and the case where the specific caller is not received when the ringer is received It has a function of connecting the line to the telephone 2 side and sending a ringer to the telephone 2. Then, as a method for detecting the caller number signal, the caller number is read by synchronizing with the change in the bit included in the caller number signal.

The off-hook detector 18 monitors the impedance of the telephone 2 by applying a voltage from the power source to the telephone 2 with the telephone 2 disconnected from the telephone line. Then, when the impedance is below a certain value, it is determined to be off-hook, and when the impedance is above a certain value, it is determined to be on-hook.

In the above configuration, in the standby state where the terminal equipment waits for a call from the center side, the switch switching section 15 connects the telephone 2 to the off-hook detecting section 18 side in order to detect the use state of the telephone 2, and the telephone 2 Is always disconnected from the telephone line.

When the center side system 7 is activated, a ringer is sent from the exchange to the terminal side system 4. At this time, a caller number signal indicating the number of the center-side system 7 is inserted during the ringer and the ringer idle period. The caller number signal is sent in a telegram format with a baud rate of 1200 baud and a character length of JIS7. The baud rate and character length are not limited to this.

As shown in FIG. 4, this message format is composed of a mark portion, a message type word portion, a data word count portion, a data portion, and a character portion including a checksum portion, and the data portion is a telephone number or the like. Data, which includes a start bit, 7 bits of data, a parity bit, and a stop bit. Note that this electronic message format is not limited to the above, and for example, the formats (formats) used in the United States are shown in FIGS.

When the extreme-polarity signal sent from the exchange to the terminal-side system 4 by the activation of the center-side system 7 is detected by the extreme-polarity detection unit 13, the control unit 19 of the terminal device 1 is operated as shown in FIG. Input port interrupts are set at both edges of the transition point where bits change from 0 to 1 or 1 to 0 (step 1). Here, the caller ID signal is
As shown in FIG. 7, there is a change point A due to a change in bit.

Next, due to the interrupt of the set input port of the control unit 19, bits 0 to 1 of the caller number signal are set.
Alternatively, the change point A from 1 to 0 is detected (step 2). Then, by using this point A as a synchronization point, the timer in the control unit 19 is cleared to 0.417 mse in the case of 1/2 bit time, that is, the baud rate of 1200 baud.
Set a timer in c (step 3). When the timer times out, that is, the bit is read with the point B as the center of the bit (step 4).

Further, the timer in the control unit 19 is cleared from the point B, and 1 bit time, that is, 0.834 mse.
The timer of c is set (step 5), sampling is performed every time the timer times out, and, for example, the bit at point C is read (step 6).

In this way, each time the change point A is detected, that is, each time an interrupt signal from the input port is input, the process returns to step 2 to set that point as a new synchronization point, and bit data is further read and detected. Then, the detected bit data is stored in the RAM in the control unit 19 (step 7). And the F used to modulate the calling number signal
When there is no SK signal carrier, the process ends (step 8).

Next, the detected bit string is replaced with 10 bits from the rear.
Bits (when the character length is JIS7, start bit + parity bit + stop bit) are separated as one character. At this time, if there are not enough bits to configure the character, the process ends.

It is possible that 7 bits of data + 8 bits of parity become 8 bits of data.
The control unit 19 may automatically determine whether or not there is a parity bit by dividing each bit.

Next, when the caller's number is obtained from the obtained character, the checksum portion is followed from the back, followed by the end of the telephone number. Then, the obtained telephone number and the control unit 1
The caller number registered in 9 is compared from the end. Here, if even one digit is different, it is determined that the caller is not the registered specific caller, and the switch switching unit 15 connects the telephone line to the telephone 2 and sends the ringer to the telephone 2. However, if the detected part matches the registered caller ID, there is a high probability that it is a call from the center side system 7,
The switch switching unit 15 does not connect the telephone line to the telephone 2 in order to detect the next caller number signal. Note that the checksum part is ignored because the entire electronic message has not been imported.

At this time, the next caller number signal is detected only when the probability of the call from the center side system 7 is high, but the probability that the call is not from the center side system 7 is not zero. If the next caller number signal is detected and it is identified that the system is not the center side system 7, the number of ringers sent to the telephone 2 may be reduced, which may be a hindrance. Therefore, even if the caller number cannot be identified by the first detection, it is possible to set whether or not to send the ringer to the telephone set 2.

This setting is made by software, and is set by writing to a part of the RAM in the control section 19 by a command, and the contents of this memory location can be read by another command. ing. The command is sent from the center via a modem or via a meter interface by switching a setting device such as a DIP switch.
The setting change process is performed by.

As described above, since the change point of the bit of the caller number signal is used as the synchronization timing for reading the caller number, the caller number can be detected even in the middle. Furthermore, by comparing the caller number detected midway with the registered caller number, it is possible to quickly identify whether or not the caller is a specific caller. Therefore, the number of ringers sent to a terminal device such as a telephone need not be reduced, and an answering machine or the like for counting the number of ringers does not have any trouble and is very convenient.

Further, since the ringer can be set to be sent to the telephone regardless of whether or not the caller number is detected, the ringer can be surely sent to the terminal equipment and the number of ringers is counted. Very convenient to use terminal equipment.

The present invention is not limited to the above embodiment, and it goes without saying that many modifications and changes can be made to the above embodiment within the scope of the present invention.

[0031]

As is apparent from the above description, according to the present invention, the caller number can be detected midway, and by comparing the caller number detected midway with the registered caller number, It is very easy to use because it can identify whether or not the caller is a specific sender. Therefore, it is not necessary to reduce the number of ringers sent to terminal devices such as telephones,
It is very convenient because it will not interfere with answering machines that count the number of ringers.

Further, since the ringer can be set to be sent to the telephone, the ringer can be surely sent to the terminal device, which is very convenient for using the terminal device for counting the number of ringers.

[Brief description of drawings]

FIG. 1 is a flowchart for detecting a caller ID signal of the present invention.

FIG. 2 is a block diagram of a no ringing communication system.

FIG. 3 is a control block diagram of the terminal device.

FIG. 4 is a block diagram of a message format of a caller number signal.

FIG. 5 is a diagram showing an example of a message format.

FIG. 6 is a diagram showing an example of a message format.

FIG. 7 is a diagram showing bits of a caller ID signal.

[Explanation of symbols]

 1 terminal device 2 telephone 4 terminal side system 7 center side system 19 control unit

Claims (4)

[Claims] 1. A detection means for detecting a caller's number signal sent from an exchange in a communication system for performing data transmission by no ringing communication between a terminal side system and a center side system using a telephone line. And a communication means for performing no ringing communication when it is a call from the center side system by identifying whether or not the call is from the center side system by the transmitted caller number signal. A no-ringing communication system characterized in that a calling number is read by synchronizing with a change in a bit included in a calling number signal. 2. The no-ringing communication system according to claim 1, wherein a part of the calling number read from the middle is compared with the registered calling number. 3. The no-ringing communication system according to claim 2, wherein the end of the bit string of the read caller number is converted into a character and the character is compared with the registered caller number. 4. The no-ringing communication system according to claim 1, further comprising setting means for setting whether or not to send the call signal to the terminal device regardless of whether or not the caller number signal is detected.