JPH09200383A - Data communication system and caller side equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To select automatically a transmission control system with a high transmission efficiency in response to a characteristic of a communication line in use by executing succeeding data transmission control based on a data transmission control system informed from a caller side equipment. SOLUTION: A data communication equipment 1 being a caller equipment and an opposite station 50 being a called party equipment make data communication by using a 1st communication line generating a charging pulse for collection of charge or a 2nd communication line not generating a charging pulse. Then the data communication equipment 1 sets the system of data transmission control to be a 1st data transmission control system when a charging pulse is detected within a prescribed period and sets a 2nd data transmission control system when not detected. Moreover, the opposite station 50 executes succeeding data transmission control based on the data transmission control system noticed from the data communication equipment 1.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a public telephone line, etc.
A calling-side device and a called-side device using either the first communication line in which the charge is collected when the charging pulse is generated or the second communication line in which the charging pulse is not generated such as a general subscriber telephone line It relates to data communication between the two.

[0002]

2. Description of the Related Art Conventionally, in the case of considering a data communication system using a telephone line, for example, the control method of data transmission differs depending on the type of the telephone line used. For example, in the case of a telephone line or the like to which a so-called pink public telephone is connected, a charging pulse is generated for fee collection, but a charging line is used for a general subscriber telephone line or the like to which a home telephone or the like is connected. Is not generated, and the existence of this charging pulse affects the data transmission.

In data transmission using a telephone line for public telephones, for example, charging pulse noise may cause missing or garbled reception data. When the received data is missing or corrupted, it is necessary to retransmit the data. Therefore, data transmission is performed by the following control method. For example, as an example of the control method, it is conceivable to divide the transmission data into a certain small size (block) and transmit the data in order to minimize the above-described retransmission request. As another control method, for example, Japanese Patent Application Laid-Open No. 2-
As described in No. 90865, it is possible to acquire the generation cycle of the charging pulse and temporarily stop the data transmission or the reception at the generation timing of the charging pulse.

On the other hand, in a telephone line in which such a charging pulse does not occur, the probability of such data loss or data corruption occurring is very low as compared with a telephone line in which a charging pulse occurs. Therefore, it is possible to take a long block for data transmission, and as a result, the total number of blocks to be transmitted is reduced, so that the burden required for blocking and the response processing required for each block are reduced. Therefore, it is possible to prevent a decrease in transmission efficiency.

[0005]

However, the above-mentioned 2)
In the case of a device that can be used for both types of telephone lines, basically, there is no choice but to design so as to avoid the inconvenience when used for telephone lines that generate charging pulses. As a result, the data transmission efficiency is lowered when a telephone line for general subscription that does not occur is used. Of course, not only the telephone line but also the management system has the same problem when there are a plurality of types of communication lines in which the presence or absence of the charging pulse is set according to the application.

The present invention has been made to solve the above-mentioned problems, and although it can be used for both of the above two types of communication lines, the transmission efficiency can be improved according to the characteristics of the communication line to be used. The purpose is to enable automatic selection of a high transmission control method.

[0007]

Means for Solving the Problems and Effects of the Invention The invention according to claim 1 made in order to achieve the above-mentioned object, is the first communication line or the above-mentioned first communication line in which the charge is collected by the generation of the charging pulse. In a data communication system for performing data communication between a calling side device and a called side device by using any of the second communication lines in which a charging pulse is not generated,
The calling device has a relatively high transmission efficiency when using the first communication line and a relatively high transmission efficiency when using the first data transmission control method and the second communication line. In the case where the transmission control means capable of executing switching between the higher second data transmission control method, the charging pulse detecting means for detecting the charging pulse, and the charging pulse detecting means detecting the charging pulse within a predetermined period. Sets the method of data transmission control executed by the transmission control means to the first data transmission control method, and sets the second data transmission control method when the charging pulse is not detected. The control method setting means and the control method notifying means for notifying the called-side apparatus of the data transmission control method set by the control-method setting means are provided, while the called-side apparatus is provided with the first method. communication By switching between a first data transmission control method in which the transmission efficiency is relatively high when a line is used and a second data transmission control method in which the transmission efficiency is relatively high when the second communication line is used. A data communication system, which is capable of executing transmission control, and is configured to execute subsequent data transmission control based on a data transmission control method notified from the calling side device.

The present data communication system uses either the first communication line in which the charge is collected by the generation of the charging pulse or the second communication line in which the charging pulse does not occur, and is connected to the calling side device. The transmission control means of the calling side device performs data communication with the calling side device, and the transmission control means of the calling side device has a relatively high transmission efficiency when using the first communication line. When the second communication line is used, the second data transmission control method, which has relatively high transmission efficiency, can be switched and executed.

Here, the control method setting means of the calling side device is
When the charging pulse detection means detects the charging pulse within a predetermined period, the method of data transmission control executed by the transmission control means is set to the first data transmission control method, and when not detected, the first data transmission control method is set. The data transmission control method of No. 2 is set. Therefore, the subsequent data transmission is executed based on the set data transmission control method.

Further, the control method notifying means notifies the called side device of the data transmission control method set by the control method setting means. The called device also has a first data transmission control method that has a relatively high transmission efficiency when using the first communication line, and a second data transmission method that has a relatively high transmission efficiency when using the second communication line. The transmission control can be executed by switching the data transmission control method, and the subsequent data transmission control is executed based on the data transmission control method notified by the calling side device.

Therefore, the data communication between the calling side device and the called side device is performed by a transmission control method having a high transmission efficiency which is automatically selected according to the characteristics of the communication line used at that time. Will be executed. For example, when performing data transmission using a public telephone line, a charging pulse is detected and transmission control is performed by the first data transmission control method. As the transmission control by the first data transmission control method, for example, transmission data is divided into a certain small size (block) for transmission in order to prevent the reception data from being lost or corrupted due to charging pulse noise. It is conceivable to acquire the accounting pulse generation cycle and suspend the data transmission or reception at the accounting pulse generation timing.

On the other hand, for example, when performing data transmission using a general subscriber telephone line, since the charging pulse is not generated, the transmission control is performed by the second data transmission control method. As a transmission control by the second data transmission control method, it is possible to take a long block for data transmission. With this configuration, the number of transmission blocks is reduced even if the same amount of data is transmitted, and thus the burden required for blocking and the response processing burden required for each block is reduced in the case of the first data transmission control. Since it is smaller than the above, the transmission efficiency is relatively improved.

The transmission control according to the first data transmission control method or the transmission control according to the second data transmission control method is not limited to the above-mentioned specific example, and may be any one as long as the transmission efficiency is relatively improved. . Further, in such a data communication system, as described in claim 2, for example, one calling side device as a host device and a plurality of called side devices as terminal devices are provided. Various systems are possible. This is effective as a system for periodically inquiring from a host device side to a plurality of terminal devices, collecting the operating status, and delivering new information and the like. In such a system, if the transmission efficiency is improved for each called-side device as a terminal device, the effect is greatly enhanced when a large number of such terminal devices exist. Of course, the host device does not necessarily have to be the calling side device, and is also effective in data communication in which the terminal device is the calling side device and the host device is the called side device. An example of such a system is
A so-called online karaoke system and the like can be mentioned. In the case of a communication karaoke system, new music is distributed from the host device to the karaoke terminal at any time, and operation information of each terminal is collected.

Further, as a calling side device which is effective for use in the above-mentioned data communication system, a constitution as shown in claim 3 can be considered. That is, the configuration is such that the data is exchanged with the called device by using either the first communication line in which the charge is collected by the generation of the charging pulse or the second communication line in which the charging pulse is not generated. In the calling side device that performs communication, the transmission efficiency is relatively high when the first communication line is used and the first data transmission control method is relatively high when the second communication line is used. Transmission control means that can be executed by switching between the second higher data transmission control method, the charging pulse detection means for detecting the charging pulse, and the charging pulse detection means detects the charging pulse within a predetermined period. In this case, the data transmission control method executed by the transmission control means is set to the first data transmission control method, and when the charging pulse is not detected, the second data transmission control method is set. A control method setting means for setting the control method, a data transmission control method set by the control method setting unit, characterized in that a control scheme notifying means for notifying the called device.

Regarding the operation of this calling side device,
Since it has been described in the above description of the operation of the data communication system, it is omitted here. Also, in such a calling side device, as described in claim 4, it is configured as a calling side device capable of individually transmitting data to a plurality of called side devices as data transmission partners. It is possible to do it. As described in the description of claim 2, if the transmission efficiency is improved for each called side device, the effect is greatly enhanced when a large number of such called side devices exist.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a data communication system according to an embodiment. This data communication system roughly includes a data communication device 1 that functions as a "calling side device" or a "calling side device",
It comprises a public telephone line 30 as a "communication line" and a partner station 50 that functions as a "callee device" or, in some cases, a "caller device".

The terminal device 1 has a CPU 10 as a control means for controlling the operation of the entire terminal device.
In the PU 10, a RAM 12 that is a work area of the operation program of the CPU 10, a ROM 14 that stores the operation program of the CPU 10, and a public telephone line 30
Connection / disconnection of the line between the modem 16 that transmits and receives data to and from the modem of the partner station 50 that is the communication partner, and the network
And NCU (Network Control Unit) 18 for dialing, and CPU for detecting the presence or absence of a charging pulse
A billing pulse detection circuit 20 as a "billing pulse detection means" for informing 10 is connected.

The CPU 10 is connected to the modem 16 based on a call request received from a personal computer or the like connected from the outside.
And control the NCU 18. In addition, when the data communication device 1 functions as a calling side device, the CPU 10
It corresponds to "transmission control means", "control method setting means" and "control method notifying means".

Of course, the partner station 50, which is the partner of communication, is basically equipped with such means, but for example, the partner station 50 is constructed so as to function only as a called side device. In this case, the above-mentioned “control method notification means” may not be provided.

The ROM 14 stores control procedures and transmission control procedures for each device in the form of processing programs. In this embodiment, two types of data transmission control methods can be selected and used as this transmission control procedure. The first data transmission control method is a communication line (hereinafter, referred to as a communication line which collects charges by generating a charging pulse, such as a telephone line to which a public telephone is connected).
Called the first communication line. ) Is used, the transmission efficiency becomes relatively high. On the other hand, the second data transmission control method uses a communication line (hereinafter referred to as a second communication line) in which a charging pulse does not occur, such as a telephone line for general subscription to which a home telephone or the like is connected. In this case, the control method is such that the transmission efficiency is relatively high.

Specific examples of these two data transmission control methods will be described. As the transmission control by the first data transmission control method, for example, in order to prevent the received data from being lost or corrupted due to charging pulse noise, the transmission data is divided into a certain small size (block) and transmitted.
It is conceivable to acquire the accounting pulse generation cycle and suspend the data transmission or reception at the accounting pulse generation timing. On the other hand, as transmission control by the second data transmission control method, it is conceivable to take a long block for data transmission. With this configuration, the number of transmission blocks is reduced even if the same amount of data is transmitted, and thus the burden required for blocking and the response processing burden required for each block is reduced in the case of the first data transmission control. Since it is smaller than the above, the transmission efficiency is relatively improved.

As described above, the transmission control according to the first data transmission control method and the transmission control according to the second data transmission control method are performed when they are used for the first communication line and the second communication line, respectively. The efficiency is relatively improved, and the transmission efficiency is relatively decreased in the reverse combination. Therefore, it is necessary to determine the type of communication line currently connected and select the optimum data transmission control method according to the type.

Therefore, in the data communication system of the present embodiment, the type of the connected communication line is discriminated, and the transmission control is performed by the first or second data transmission control method selected according to the type. It is configured.
As can be understood from the above description, the public telephone line 30 of this embodiment may function as a first communication line or a second communication line.

Hereinafter, the processing relating to the data transmission control in this system will be described with reference to FIGS. FIG. 2 shows a communication procedure in the data communication device 1 of the calling side device. In the first step S100, the off-hook operation is performed first, and in the subsequent step S110, the partner station 50
The dial signal indicating the telephone number is sent after confirmation of the dial tone. At this point, it is not known whether the public telephone line 30 to which the data communication device 1 is currently connected is the above-mentioned first communication line or the second communication line.

Then, in S120, the response signal from the partner station 50 is received. The response signal in this embodiment is a tone signal of a single frequency for 2 seconds, and is used for confirming that the other party is a legitimate communication partner, acquiring the timing of the first data transmission, and detecting the charging pulse. Note that S12
Details of the response signal reception processing at 0 will be described later with reference to FIG.

At S130, the state of the response signal obtained by the response signal receiving process at S120 is determined. There are three types of judgment results, and if it can be judged that the response signal is a proper response signal, the process proceeds to S140, the second data transmission control method is selected, and there is an interruption of the tone signal which is considered as a charging pulse in the response signal. If so, the process proceeds to S150 and the first data transmission control method is selected. If the length of the response signal deviates from the predetermined range, it is determined that the communication partner is not a legitimate communication partner, the process proceeds to S180, the on-hook operation is performed as it is, and the communication is stopped.

When the normal response signal is received, the second response is made in S140.
If the data transmission control method of No. 1 is selected, or if the interrupted response signal is detected and the first data transmission control method is selected in S150, the process proceeds to S160. In S160, the transmission control method determined respectively is notified to the called station 50 as the called station.

Then, in S170, data transmission processing is performed according to the transmission control method. This transmission process has been described above, but if it is simply repeated, the data transmission process according to the first data transmission control method shows that the transmission data has a fixed small size ( It is conceivable that the transmission is divided into blocks, the charging pulse generation period is acquired, and data transmission or reception is temporarily stopped at the charging pulse generation timing. On the other hand, as transmission control by the second data transmission control method, it is conceivable to take a long block for data transmission.

After the data transmission processing in S170 is completed, S
Transition to 180. In S180, the communication is ended by going on-hook as described above. Next, with reference to FIG. 3, a communication starting procedure in the partner station 50 which is the called side device will be described.

The process of FIG. 3 is started by detecting a ringing tone for an incoming call. First, an off-hook operation is performed in step S200, and in a succeeding step S210, a response signal is sent to the data communication device 1 of the calling side device for 2 seconds.
Then, in S220, the data transmission control method is received from the other party (in this case, the data communication device 1).

The notified data transmission control method is set to S230.
In step S240 and S250, a transmission control method is selected accordingly. That is, when the data communication apparatus 1 notifies the second data transmission control method that does not support the charging pulse, the partner station 50 as the called side apparatus also selects the second data transmission control method. (S24
0). On the other hand, when the data communication apparatus 1 notifies the first data transmission control method corresponding to the charging pulse, the partner station 50 as the called side apparatus also selects the first data transmission control method ( S250).

Then, in the following S260, the above S240
Alternatively, the data transmission process is executed based on the data transmission control method selected in S250. This transmission process is basically the same as the process on the data communication device 1 side, and will not be described here. After all the transmissions are completed, the process proceeds to S270, the communication line is disconnected by on-hook, and the communication is completed.

On the other hand, in the transmission control method determination processing in S230, if the transmission control method cannot be correctly received from the calling side device, an error occurs and the process proceeds to S270.
As it is, the public telephone line 30 is disconnected by the on-hook, and the processing ends. The above is the outline of the communication processing between the data communication apparatus 1 as the calling side apparatus and the partner station 50 as the called side apparatus. Next, the processing in S120 of FIG. 2, that is, the calling side Data communication device 1 as device
The contents of the response signal reception process executed in step S1 will be described in detail with reference to FIG.

First, in the first step S300, the start of a response signal is waited for. At that time, a timer is started to limit the waiting time. If a response signal is detected or a time-out occurs, it is determined in S310 which one has occurred. In case of time-out, after shifting to S430 and setting “no response signal”,
This processing is terminated as it is, and the process proceeds to S130 of FIG.

On the other hand, when the response signal is detected in S310, the process proceeds to S320, and the timer is started to measure the length of the response signal. Then, in S330, the interruption flag (a flag indicating whether or not there is an interruption in the middle of the response signal) is reset, and in S340, the stop of the response signal is waited for.

When the response signal stops or the timer times out, it is judged in S350 which one has occurred, and if the time is out, the process proceeds to S430, and after the "abnormality of the response signal" is set, it is left as it is. This process ends once. When the response signal is stopped, the process proceeds to S360, and it is determined whether the signal continuation time from the start is an appropriate length.

If it is determined to be appropriate in S360, the process proceeds to S400, and it is determined whether or not the interruption flag is set. S if the suspend flag is set
If the interruption flag is not set, the process proceeds to step S420.
It is determined that there is no charging pulse, and this processing ends.

On the other hand, if it is determined in S360 that the signal duration is short, it is considered to be a temporary interruption due to the charging pulse. Therefore, the flow proceeds to S370, the interruption flag is set, and the response signal is sent in S380. Wait for it to resume. When the restart of the response signal is detected or a time-out occurs, it is determined in S390 which one has occurred. When the response signal is detected, the process returns to S340 and waits again for the stop of the response signal. On the other hand, when the time-out occurs, it can be considered that the charging pulses overlap in the latter half of the response signal. Therefore, the process proceeds to S410, it is determined that “the charging pulse is present”, and the present process ends.

The steps S410 and S42 shown in FIG.
0, based on the determination result in S430, S1 in FIG.
The state of the response signal at 30 will be determined. As described above, the present data communication system uses either the first communication line in which the charge is collected by the generation of the charging pulse or the second communication line in which the charging pulse is not generated, to the calling side. The data communication device 1 as a device and the partner station 50 as a called device perform data communication, and the data communication device 1 as a calling device is used.
In the first data transmission control method, the transmission efficiency is relatively high when the first communication line is used, and the second data transmission is relatively high when the second communication line is used. It is set so that the control method can be switched and executed. Then, the data communication device 1 sets the data transmission control method to the first data transmission control method when the charging pulse is detected within the predetermined period, and the second data transmission when it is not detected. Set to the control method. Therefore, the subsequent data transmission is executed based on the set data transmission control method.

Further, the set data transmission control method is notified to the partner station 50 as the called side device. Similarly to the data communication device 1, the partner station 50 is also set to be able to execute transmission control by switching between the first data transmission control system and the second data transmission control system, and is notified by the data communication device 1. The subsequent data transmission control is executed based on the data transmission control method.

Therefore, data communication between the data communication device 1 of the calling side device and the partner station 50 of the called side device is
The transmission control method with high transmission efficiency is automatically selected according to the characteristics of the communication line used at that time. That is, in the transmission control by the first data transmission control method when the charging pulse is detected, the transmission data is divided into a certain small size (block) in order to prevent the reception data from being lost or corrupted due to the charging pulse noise. The charging pulse generation cycle is acquired, and the data transmission or reception is temporarily stopped at the charging pulse generation timing. On the other hand, the transmission control by the second data transmission control method when the charging pulse does not occur is
Take longer blocks when sending data. By doing this, the number of transmission blocks is reduced even if the same amount of data is transmitted, so that the burden required for blocking and the response processing burden required for each block is greater than in the first data transmission control. Therefore, the transmission efficiency is relatively improved.

As described above, since the transmission control method having a high transmission efficiency can be automatically selected according to the characteristics of the communication line to be used, it can be used for both of the above two types of communication lines, and thus the communication to be used. It is not necessary to prepare in advance a dedicated device for each line.

In such a data communication system, for example, one data communication device 1 as a calling side device as a host device and a plurality of partner stations 50 as called side devices as terminal devices are provided. It is conceivable that such a system is provided. This is effective as a system for periodically inquiring from a host device side to a plurality of terminal devices, collecting the operating status, and delivering new information and the like. In such a system, if the transmission efficiency is improved for each terminal device as a called side device, the effect is greatly enhanced when a large number of such terminal devices exist. Of course, the host device does not necessarily have to be the calling side device, and is also effective in data communication in which the terminal device is the calling side device and the host device is the called side device.

An example of such a system is a so-called online karaoke system. In the case of a communication karaoke system, new music is distributed from the host device to the karaoke terminal at any time, and operation information of each terminal is collected. Since many karaoke terminals are often connected to one host device, and new song distribution is often executed frequently, it is very effective when applied to this system.

Further, in the above embodiment, the data communication device 1
The system in the case where is the calling side device has been described, but if the partner station 50 has the same function as the data communication device 1, the data communication device 1 in that case operates as the called side device. Become. That is, the partner station 50 is notified of the data transmission control method, and the processing shown in FIG. 3 is executed.

The present invention is not limited to the embodiments as described above, and can be implemented in various forms without departing from the scope of the present invention. For example, the specific example has been described as the transmission control according to the first data transmission control method or the transmission control according to the second data transmission control method, but the present invention is not limited to the above specific example, and the transmission efficiency may be relatively improved. Good.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a data communication system according to an embodiment.

FIG. 2 is a flowchart showing a communication procedure in a data communication device as a calling side device.

FIG. 3 is a flowchart showing a communication procedure in a partner station as a called side device.

FIG. 4 is a flowchart showing a response signal receiving process in a data communication device as a calling side device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Terminal device 10 ... CPU 12 ... RAM 14 ... ROM 16 ... Modem 18 ... NCU (Network control unit) 20 ... Charging pulse detection circuit 30 ... Public telephone line 50 ... Partner station

Claims (4)

[Claims] 1. A calling-side device and a called-side device using either a first communication line in which a charge is collected by the generation of a charging pulse or a second communication line in which the charging pulse is not generated. In the data communication system for performing data communication between the first communication device and the second communication device, the calling side device has a relatively high transmission efficiency when the first communication line is used. A transmission control means capable of executing by switching between a second data transmission control method having a relatively high transmission efficiency when a line is used; a charging pulse detecting means for detecting the charging pulse; If the charging pulse is detected by the charging pulse detection means, the data transmission control method executed by the transmission control means is set to the first data transmission control method, and the charging pulse is not detected. Control method setting means for setting the second data transmission control method, and control method notification means for notifying the called side device of the data transmission control method set by the control method setting means. On the other hand, the called-side device transmits data when using the first data transmission control method and the second communication line, which has relatively high transmission efficiency when using the first communication line. The transmission control can be executed by switching between the second data transmission control method having a relatively high efficiency, and the subsequent data transmission control is executed based on the data transmission control method notified by the calling side device. A data communication system characterized by being configured. 2. A data communication system, wherein a plurality of the callee devices are provided for one caller device. 3. Data communication with a called-side device by using either a first communication line in which a charge is collected when a charging pulse is generated or a second communication line in which the charging pulse is not generated. In the calling-side device that performs the above, the first data transmission control method has a relatively high transmission efficiency when the first communication line is used, and the transmission efficiency is relatively high when the second communication line is used. Transmission control means that can be executed by switching the second data transmission control method, which is extremely high, a charging pulse detection means for detecting the charging pulse, and a charging pulse detected by the charging pulse detection means within a predetermined period. In this case, the data transmission control method executed by the transmission control means is set to the first data transmission control method, and the second data transmission control method is used when the charging pulse is not detected. A calling side device comprising: a control method setting means for setting the expression, and a control method notifying means for notifying the called device of the data transmission control method set by the control method setting means. 4. The calling-side device according to claim 3, wherein a plurality of called-side devices are used as data transmission partners, and data is individually transmitted to each of them.