JPH0955754A - Inter-media synchronization system and its synchronizing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inter-media synchronization system and a synchronizing method which perform data processing in time series without being affected by transmission delay on a communication network between a plurality of terminals when the terminals send data to the same terminal. SOLUTION: A transmitting terminal has a measuring means 1150 which measures an elapsed time, a means 1103 which stores the measured time of data transmission from the transmitting terminal to a receiving terminal, and sending-out means 1305-1307 which send data and transmission time information as one-unit information to the receiving terminal. The receiving terminal has separating means 1302A and 1302B which separate the information from the sending-out means into the data part and transmission time information, a means 1310 which stores the longest transmission time among transmission times obtained by the separating means, a means 1303 which finds differences between the longest transmission time and the respective transmission times obtained by the separating means, means 1301A and 1301B which process obtained data, and delay means 1309A and 1309B which delay the process start times of the processing means by the respective found difference times.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an ATM (Asynchronous)
ous Transfer Mode) The present invention relates to an inter-media synchronization method of various multimedia terminals which are connected to each other via a line.

[0002]

2. Description of the Related Art Conventionally, as a method of synchronizing media between multimedia terminals of this type, a fixed delay circuit is inserted in a medium with a small delay so that the delay between terminals due to communication processing of each medium becomes equal. Then, inter-media synchronization has been realized by eliminating the delay difference from the medium having a large delay.

Further, as disclosed in Japanese Patent Laid-Open No. 05-114912, the time stamp values set in the transmission timing control unit and the reception timing control unit are gradually changed to autonomously correct delay between terminals. By doing so, the synchronization between media was realized.

Further, as disclosed in Japanese Patent Laid-Open No. 04-199931, a delay circuit for detecting the mutual delay amount of two input data in the same transmitting terminal using two B channels of "INS64". The two input data are output in synchronization with each other to realize synchronization between media.

As a method for adjusting the clocks on the transmitting and receiving sides, as shown in Japanese Patent Laid-Open No. 06-303254, the source clock of the transmission data is reproduced on the receiving side by using a network clock.

[0006]

In the conventional method as described above, when a medium with a large processing delay is added during communication, the media that have been connected up to now and the added media are synchronized indefinitely. There was a drawback that I couldn't get it.

Further, the method disclosed in Japanese Patent Laid-Open No. 05-114912 has a drawback in that synchronization cannot be achieved until the change of the maximum delay value in transmission / reception is completed.

In the system as disclosed in Japanese Patent Laid-Open No. 04-199931, when there are a plurality of transmitting side terminals and the plurality of transmitting side terminals try to synchronize with one receiving side terminal, It had the drawback of not being in sync.

Further, in the method disclosed in Japanese Patent Laid-Open No. 06-303254, the source clock of the transmission data is regenerated on the receiving side by using the network clock, so it is necessary to always receive the network clock. .

Therefore, an object of the present invention is to transmit data from a plurality of transmitting terminal devices to one receiving terminal device through a communication network, and to transmit data from each transmitting terminal device on the communication network. Inter-media synchronization system and its synchronization method capable of ensuring reliable synchronization even if there is a difference in the amount of transmission delay of each other, that is, performing processing in the receiving terminal device in the order of transmission from each transmitting terminal device. To provide.

[0011]

In order to achieve the above object, the present invention takes the following apparatus and method.

(1) One from a plurality of transmission terminal devices
In an inter-media synchronization system for transmitting data to one receiving terminal device via a communication network while synchronizing, data transmission from each of at least two transmitting terminal devices among the plurality of transmitting terminal devices to the receiving terminal device is performed. A time measuring means for measuring a required data transmission time, and at least the measured time of 2
A longest data transmission time detecting means for detecting the longest time of the two data transmission times; a difference detecting means for obtaining a difference between the longest data transmission time and one of the measured data transmission times; Processing delay means for delaying the start of data processing in the receiving terminal device of data transmitted from the transmitting terminal device corresponding to one of the used data transmission times, by a difference time obtained by the difference detecting means, And an inter-media synchronization system characterized by having.

(2) One from a plurality of transmission terminal devices
In an inter-media synchronization system that transmits data to one receiving terminal device via a communication network while synchronizing with each other, each of the transmitting terminal devices measures time with a time measuring unit and the time measuring unit. A transmission time storage means for storing a transmission time required for transmitting data from the transmission terminal device to the reception terminal device, and 1 for the data and the transmission time.
Information receiving means for sending to the receiving terminal device as unit information, and the receiving terminal device divides the information of one unit sent from the information sending device into the data and the information regarding the transmission time. Information separating means, longest transmission time storage means for storing the longest transmission time of the transmission times obtained by the information separating means, longest transmission time stored in the longest transmission time storage means, and the longest transmission time obtained by the separation means. Difference calculation means for obtaining a difference from each of the transmission times, data processing means for processing the data obtained by the information separation means, and each difference time obtained by the information separation means for each difference time obtained by the difference calculation means Processing delay means for delaying the processing start time of the data in the data processing means,
The inter-media synchronization system is configured to have.

(3) One from a plurality of transmission terminal devices
A method for synchronizing media when transmitting data to one receiving terminal device via a communication network, the first step of measuring a transmission time required for transmitting data from the transmitting terminal device to the receiving terminal device, and the transmission time. A second step of transmitting the data from the transmitting terminal device to the receiving terminal device together with the data, a third step of storing the longest transmission time transmitted to the receiving terminal device, and the third step. In the fourth step of obtaining the difference between the longest time stored in step 4 and each transmission time, and the fifth step of delaying each processing start time of the data in the receiving terminal device by each difference time obtained in the fourth step. And an inter-media synchronization method comprising the steps of:

(Operation) As a result, the following operation is obtained by the present invention.

The transmission time required for data transmission between the two terminal devices measured by the time measuring means is stored in the transmission time storing means, and the information sending means makes the transmission time together with the data into a predetermined transmission unit and the target receiving terminal device. In the receiving terminal device receiving this, the information separating means separates the information of this unit into data and transmission time information and reproduces it, and stores the longest transmission time in the longest transmission time storage means. . The difference calculation means obtains the difference between the stored longest transmission time and each transmission time obtained by the separating means, and the processing delay means causes the data processing means to reproduce the data reproduced by the information separating means for each obtained difference time. Delay processing start time.

That is, when the transmitting terminal device A makes a "calling request", as a time stamp, the receiving terminal device side acquires a counter value that is cyclically counted in response to the passage of time, and A value including a delay due to the transmission time of communication is set in the counter of the terminal No. 1, and the same counter value is used in each of the transmitting terminal devices A and B and the receiving terminal.

Further, by adding this counter value to the packet data and transmitting the packet data, the maximum delay time required for communication between the respective transmitting / receiving terminal devices can be calculated,
Processing of all data transmitted from the transmission terminal device A side or B side is delayed by the maximum delay time.

Therefore, the processing of the data after the call request is delivered to the receiving terminal device does not follow the order of the data sent to this receiving terminal device, but the order sent by the application of the sending terminal device A or B. It is processed.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A plurality of embodiments according to the present invention will be described with reference to the related drawings.

(First Embodiment) FIGS. 1 and 2 show an example according to the first embodiment of the present invention.

In FIG. 1, the transmitting terminal device A110
0, transmitting terminal device B1200 and receiving terminal device 130
FIG. 0 is a configuration diagram when transmission is performed while keeping synchronization between media.

As shown in FIG. 1, the connection relationship is such that a plurality (two in this case) of transmission terminal devices A1100 and transmission terminal devices B1200 are connected to each other via one ATM switching network 1000.
One receiving terminal device 1300 is connected. Now 2
Transmission terminal device A1100 and transmission terminal device B
1200 is trying to communicate with receiving terminal device 1300 using this communication network.

It should be noted that all the terminal devices can communicate with each other, but in this example, the transmitting side has only the main constituent elements relating to the transmitting function, and the receiving side has only the main constituent elements relating to the receiving function. It is assumed to be illustrated.

The elements constituting these two transmission terminal devices A1100 and B1200 are basically the same, and in FIG. 1, unique symbols are attached to distinguish them. The data packet assembling / disassembling processing control units 1102 and 1202 for processing the data in packet units transmitted and received respectively include counters 1103 and 120, respectively.
3 is connected. Furthermore, application 1101, 1201 and AAL (ATM Aduptation Layer) processing unit respectively
It is connected to 1105 and 1205.

The "application" described here
In the transmission terminal device A1100, for example, a camera (
It is a terminal device for sending out the video captured from (not shown) to the communication network. On the other hand, in the transmission terminal device B1200, for example, it is a terminal device for sending out the audio captured from the microphone (not shown) to the communication network. is there. Further, the receiving terminal device 1300 is, for example, a terminal device for displaying video and presenting audio.

The signal data transmitted / received via the ATM switching network 1000 has a data format specific to this communication network. For example, it is a communication network that operates in a packet format with a layered structure.

Therefore, an ATM physical layer processing unit 1107 (1207) for performing processing relating to the physical layer of the communication protocol,
ATM cell processing unit for processing packet data in cell units
This AAL processing unit 1105 (1205) via 1106 (1206) performs predetermined conversion of user data and ATM cells, that is, AAL processing.
(ATM Aduptation Layer) processing is performed to operate in synchronization with the control performed by the data packet assembly / disassembly processing control unit 1102 (1202).

The application 1101 (1201) issues a call request, and the data packet assembly / disassembly processing control unit 1102
A series of data streams are exchanged with (1202).

On the other hand, the receiving terminal device 1300 has delay processing units 1309A and 1309B for processing a time delay between a plurality of terminals.
And a delay storage unit 1308A, 1308B for storing the delay time are connected to each.

Also, like the above-mentioned transmission terminal device, a counter 1303 is connected to each of the data packet assembly / disassembly processing control units 1302A and 1302B for processing the data in packet units to be transmitted and received. In addition, each of the applications 1301A and 1301B and AAL
The processing unit 1305 is connected. Then, in the same manner as described above, the ATM physical layer processing unit 13 that performs processing relating to the physical layer
07 and an AAL processing unit 1305 connected via an ATM cell processing unit 1306 that performs packet data processing in cell units,
It is connected to the data packet assembly / disassembly processing control units 1302A and 1302B, respectively.

Each of the delay processing units 1309A and 1309B described above is connected to a maximum delay storage unit 1310 for storing only the maximum delay time so far.

Characteristic components necessary for the reception function are delay processing units 1309A and 1309B interposed between these applications 1301A and 1301B and data packet assembly / disassembly processing control units 1302A and 1302B, and delay storage. Part 1308A, 13
08B and the maximum delay storage unit 1310.

The counters 1103, 1203, 1303 in FIG. 1 are slower than the system clocks 1150, 1250, 1350 of the respective terminal devices in all the terminal devices and have a common frequency count-up cycle (for example, 1/1000). (Every second) is created by the count-up cycle creation unit 1151, 1251, 1351. Then, the counters 1103, 1203, and 1303 are incremented using this count-up cycle.

Further, FIG. 2 shows the values of the counters that change over time for the transmission terminal device A 1100, the transmission terminal device B 1200 and the reception terminal device 1300 performing transmission while synchronizing the media. It is an explanatory view shown.

The operation of the main components will be described below with reference to FIGS. 2 and 1.

When the application 1101 of one transmission terminal device A 1100 makes a call request to the reception terminal device 1300, the call request is first passed to the data packet assembly / disassembly processing control unit 1102 shown in FIG.

The data packet assembling / disassembling process control unit 1102 having received the call request initializes the counter 1103 of the transmitting terminal device A 1100 to zero. At the same time, the call request processed by the data packet assembling / disassembling process control unit 1102 is passed in the order of the AAL processing unit 1105, the ATM cell processing unit 1106, and the ATM physical layer processing unit 1107 as shown in FIG. While being processed for transmission, the data is transmitted to the receiving terminal device 1300 via the ATM switching network 1000.

Similarly to the above-mentioned procedure, when the application 1201 of the transmitting terminal device B1200 makes a call request to the receiving terminal device 1300, the transmitting terminal device B1200
The counter 1203 is initialized to 0, and at the same time, the call request data is subjected to predetermined processing in the order of the data packet assembly / disassembly processing control unit 1202, the AAL processing unit 1205, the ATM cell processing unit 1206, and the ATM physical layer processing unit 1207. ATM switching network 10
It is sent to the receiving terminal device 1300 via 00.

The calling request sent to the receiving terminal device 1300 via the ATM switching network 1000 is received by the receiving terminal device 13.
00 ATM physical layer processing unit 1307, ATM cell processing unit 13
06, sent to the AAL processing unit 1305.

The AAL processing unit 1305 distributes the call origination request for each "virtual circuit" (hereinafter abbreviated as VC), passes the data packet assembly / disassembly processing control units 1302A, 1302B different for each VC, and the applications 1301A, 1301B.
Send to The data packet assembling / disassembling process control units are provided by the number of applications.

At the same time, the data packet assembly / disassembly processing control units 1302A and 1302B initialize the maximum delay storage unit 1310 and the delay storage units 1308A and 1308B to zero.

In the applications 1301A and 1301B, each of the transmission terminal devices 1100 and 1200 sends a response to the call request relating to each VC as to whether a connection can be established.
Process to send to. In this embodiment, it is assumed that a communication line (connection) between the transmission terminal device A1100 and the transmission terminal device B1200 can be established.

The applications 1301A and 1301B of the receiving terminal device 1300 send the data packet assembling / disassembling process control units 1302A and 1302B to the two sending terminal devices A1100 and the sending terminal device B1200 in order to send back a response to the calling request. Send a response to the call request.

Each of the data packet assembling / disassembling process control units 1302A and 1302B acquires the current counter value ("234" in the example of FIG. 2) of the receiving terminal device 1300 from the counter 1303 and includes the counter value. In the form of a data packet, it is transmitted to the AAL processing unit 1305. This data sent to the AAL processing unit 1305 is the ATM cell processing unit 130.
6. The ATM physical layer processing unit 1307 processes in this order, and the AT
Each transmission terminal device 1100,1200 via the M switching network 1000
Sent to. Here, first, the transmission terminal device A1100
The processing in will be described.

On the other hand, in the transmitting terminal device A1100, the response to the call request is sent by the ATM physical layer processing units 1107, A1.
It is sent to the data packet assembling / disassembling processing control section 1102 through the TM cell processing section 1106 and the AAL processing section 1105.

Data packet assembly / disassembly processing control unit 1102
Then, it is decomposed into a data part which is a response to the call request and a time stamp part including the count value of the receiving terminal device 1300, and the data part is sent to the application 1101.

At the same time, by using the data of the time stamp part, the transmitting terminal device A1100 and the receiving terminal device are
Perform processing to make the counter values of 1300 the same.

Since the counter 1103 is initialized in the transmitting terminal device A 1100 when making a call request, the counter 1103 counts up from the current counter value until a response is returned after making a call request. You can know In the example shown in FIG. 2, the current counter value is "
This value is 2 ", and this value can be regarded as the time required for the round trip between the transmitting terminal device A 1100 and the receiving terminal device 1300, so it can be considered that one count up is possible in one way.

Therefore, by adding 1 to the data of the time stamp portion, the current receiving terminal device 1300
Since the counter value ("235") of the transmission terminal device A1100 can be predicted, the transmission terminal device A11
Receives the counter value of 00 Counter value of the terminal device 1300
Set it so that it becomes the same value as ("235") by using the system clock of the transmission terminal device A1100.

Also, in the other transmission terminal device B1200, the counter 1203 of this transmission terminal device B1200 is set by performing the same procedure as described above. Half of the current counter value ("6") of the transmitting terminal device B1200, that is, "3" is the time required for one way. Therefore, the value obtained by adding 3 to the data of the time stamp part is counted by the counter 1203.
Set to.

Therefore, by performing the above-described processing, all the counter values of the transmission terminal device A1100 and the transmission terminal device B1200 and the reception terminal device 1300 become the same value.

For convenience of explanation, the explanation has been made assuming that the delay between the transmitting and receiving terminal devices is an even number and the delay amount is small, but in reality, the data is ATM data.
The amount of delay can be even greater than in the above example because it passes through several ATM switches over the network. Therefore, even if the delay amount between the sending and receiving terminal devices becomes an odd number and cannot be divided by "2", the value may be processed by "rounding up" or "rounding down".

In this case, the transmission terminal device A11
00 and application of transmitting terminal device B1200
At 1101 and 1201, it is possible to confirm that the connection with the receiving terminal device 1300 has been established by the response to the call request from the data packet assembling / disassembling process control units 1102 and 1202. Therefore, the applications 1101, 1201 of the transmission terminal device A1100 and the transmission terminal device B1200 are
Then, the transmission of the actual communication data is started to the receiving terminal device 1300.

In the transmitting terminal device A1100, the counter value set to the same value as the counter value of the receiving terminal device 1300 is added when the actual data is sent, and the data is transmitted. When the counter value of the transmitting terminal device A1100 is "239" and data transmission is to be performed, this counter value "239" is used for data packet assembly /
The decomposition processing control unit 1102 adds the data to the AAL processing unit.
1105, ATM cell processing unit 1106, ATM physical layer processing unit
It is processed in the order of 1107 and sent to the receiving terminal device 1300 via the ATM switching network 1000.

In the transmitting terminal device B1200 as well, when data transmission is performed when the counter value is "238", the same processing is performed, and the counter value "238" is added to the data and transmitted. In chronological order, the data of the transmission terminal device B1200 is sent out earlier than the data of the transmission terminal device A1100 from the counter value added to the data.

On the other hand, in the receiving terminal device 1300, the data sent from the above-mentioned transmitting terminal device A 1100 is first sequentially transferred to the ATM physical layer processing unit 1307, the ATM physical layer processing unit 1306, and the AAL processing unit 1305, and VC Data packet assembly / disassembly processing control unit 1302A, 13 different for each
It is sent to 02B.

Here, the data from the transmitting terminal device A1100 is the data packet assembling / disassembling process control unit 1302A.
The data will be transmitted to the data packet assembling / disassembling processing control unit 1302B from the transmitting terminal device B1200, and the description will be continued.

First, when the counter value of the receiving terminal device 1300 is "240", the first data is sent to the data packet assembly / disassembly processing control unit 1302A.

Data packet assembly / disassembly processing control unit 1302
The data packet sent to A is decomposed into a data part and a time stamp part. A counter value "239" added when the transmitting terminal device A1100 sends data is added to the time stamp portion.

First, in the data packet assembling / disassembling process control unit 1302A, the counter value "239" added to the time stamp unit (not shown) and the receiving terminal device 1300
The current value of the counter 1303, "240", is compared, and the difference 1 is stored in the delay storage unit 1308A, and this value "1" is also stored.
Is sent to the maximum delay storage 1310. Next, the data itself is sent to the delay processing unit 1309A. The maximum delay storage unit 1310 compares the value with the already saved value and saves it only when the newly saved value is larger. Here, since "0" is already stored, the value stored in the maximum delay storage unit 1310 is rewritten to 1.

The delay processing unit 1309A performs delay processing for the count-up cycle in order to synchronize the data sent from the data packet assembly / disassembly processing control unit 1302A with the data sent to other applications. . The delay processing unit 1309A delays the count-up cycle by the difference between the value stored in the maximum delay storage unit 1310 and the value stored in the delay storage unit 1308A. Here, the maximum delay storage unit 1310 value "1" and the delay storage unit 1308A value "1"
0, that is, the data is sent to the application 1301A without delay processing of the data.

Next, when the counter value of the receiving terminal device 1300 is "241", the data is sent to the data packet assembling / disassembling process control unit 1302B.

Data packet assembly / disassembly processing control unit 1302
In B, the counter value "238" added to the time stamp part is compared with the current value "241" of the counter 1303 of the receiving terminal device 1300, and the difference 3 is stored in the delay storage part 1308B. The value “3” is sent to the maximum delay storage 1310. Next, the data itself is processed by the delay processing unit 1309.
Send to A.

Although "1" has already been stored in the maximum delay storage 1310, the value stored in the maximum delay storage 1310 is "1".
It is rewritten to 3 ".

In the delay processing unit 1309B, the value "3" stored in the maximum delay storage unit 1310 and the delay storage unit 1308B are stored.
The difference 0 of the value “3” stored in “0”, that is, the data is sent to the application 1301B without delay processing of the data.

The first data sent after the call request is the data sent by the sending terminal device B1200, but the data first passed to the application by the receiving terminal device 1300 is the sending terminal device A1200.
It is the data sent by the 1100.

Next, when the counter value of the receiving terminal device 1300 is "244", the data transmitted at the time of the counter value "243" of the transmitting terminal device A1100 arrives. Here, the data packet assembly / disassembly processing control unit 13
In 02A, first, the difference 1 between the counter value "243" added to the time stamp part and the current value "244" of the counter 1303 of the receiving terminal device 1300 is set in the delay storage part 13
It is saved in 08A and this value "1" is stored in the maximum delay storage unit 13
Send to 10. Next, the data itself is sent to the delay processing unit 1309A.

In the maximum delay storage unit 1310, since "3" has already been stored here, the maximum delay storage unit 1310
Data cannot be rewritten.

In the delay processing unit 1309A, the maximum delay storage unit 13
The difference 2 between the value "3" of 10 and the value "1" of the delay storage unit 1308A,
That is, delay the data by two count-up cycles,
Data is sent to application 1301A. Therefore, the counter value of the receiving terminal device 1300 is "246".
At that time, data is sent to the application 1301A and processed.

Next, when the counter value of the receiving terminal device 1300 is "245", the data is sent to the data packet assembling / disassembling process control unit 1302B.

Data packet assembly / disassembly processing control unit 1302
At B, the counter value "242" added to the time stamp part is compared with the current value "245" of the counter 1303 of the receiving terminal device 1300, and the difference 3 is stored in the delay storage part 1308B. The value “3” is sent to the maximum delay storage 1310. Next, the data itself is processed by the delay processing unit 1309.
Send to A.

Since "3" is already stored in the maximum delay storage unit 1310, the data in this maximum delay storage unit 1310 cannot be rewritten.

In the delay processing unit 1309B, the maximum delay storage unit 13
The difference between the value "3" stored in 10 and the value "3" stored in the delay storage unit 1308B is 0, that is, the data is sent to the application 1301B without delay processing of the data. Therefore, the receiving terminal device 1300
When the counter value of is "245", application 13
Data is sent to 01A for processing.

Therefore, the data of the sending terminal device B1200, which has been sent earlier than the data sent from the sending terminal device A1100, is passed to the application earlier by the receiving terminal device 1300 and processed.

(Effect 1) As a result of the above, after the data sent after the call request, the applications 1101 and 1201 are not in the order in which the data is sent to the receiving terminal device 1300.
Are processed in the order in which they are sent, it is possible to perform data processing on the receiving terminal device side in time series without being affected by the difference in transmission delay on the network between the plurality of transmitting terminal devices.

(Modification 1 of First Embodiment) As a method of setting the counter values of a plurality of transmission terminal devices to be the same, all the transmission terminal devices are supplied with power from the secondary side of the same power supply line. With such a configuration, each counter can be reset through the power supply line.

As for actual details, for example, when a certain transmitting terminal device tries to make a "Call Request", it uses the power supply line to obtain its own counter value,
Send to other terminal devices. Here, if the terminal device is supplied with power from the secondary side of the same power supply line as the transmission terminal device, the counter value can be acquired. Therefore, it is possible to set the same counter value between the transmitting terminal devices.

(Modification 2 of the first embodiment) Further, the amount of delay is not calculated by the receiving terminal device from the difference between the data of the time stamp portion sent from the transmitting terminal device and its own counter value, but the transmitting amount is transmitted. The transmission delay amount obtained when the terminal device acquires the call request response can be added to the data sent to the receiving terminal device during the actual data communication. In this way, it is not necessary to obtain the transmission delay on the receiving terminal device side, and it is not necessary to acquire the counter value of the receiving terminal device on the transmitting terminal device, which simplifies the configuration.

Specifically, in practice, when a certain transmitting terminal device makes a call request, its own counter value is initialized to zero. Then, the amount of delay required for transmission and reception is obtained from the counter value when the response to the call request is returned. Therefore, it can be said that 1/2 of the delay amount obtained here is the transmission delay when the data is transmitted from the transmission terminal device to the reception terminal device. Therefore, the transmission delay obtained here is added to the data sent from the transmitting terminal device to the receiving terminal device. Based on the delay amount added to the data sent from the sending terminal device, the receiving terminal device can know at what timing of the sending terminal device the data was sent from the difference from its own counter value. Therefore, the delay processing of data as shown in the first embodiment can be performed.

In this case, since it is not necessary to synchronize the counters in the transmission terminal device and the reception terminal device, the structure is simplified.

(Second Embodiment) FIG. 5 shows a second embodiment according to the present invention. This will be described below in comparison with the first embodiment described above.

In the above description of the first embodiment, the explanation has been made on the assumption that the counters of all the transmitting / receiving terminal devices have the same number of digits that can be expressed, but here, the transmitting / receiving terminals are respectively represented. The case where the number of representable digits or the number of bits of the counter differs between devices will be described. In this case, the counter having the smallest number of digits or bits is adapted.

In this embodiment, the counters 5103, 5203, 53
03 are 8-bit, 24-bit, and 16-bit counters, respectively. In order to use the counters 5203 and 5303 as if they were 8-bit counters, the counter reset units 5104,5
204, a counter comparison control unit 5304 is added to the first embodiment.

Further, the counter 5103 of the transmitting terminal device A 5100 is 8 bits, and the representable number is "0" to "25".
Up to 5 ", counter of transmitting terminal device B5200
5203 is 24 bits, and the number that can be expressed is "0" to "167.
Up to 77215 ", and receiving terminal equipment 5300
Counter 5303 has 16 bits, and the number that can be expressed is "0".
Up to "65535".

The transmitting terminal device A 5100 sets the counter 5103 to the maximum value "255" at the time of the call request and
255 "is a data packet assembly / disassembly processing control unit 5102.
AAL processing unit 5105, ATM cell processing unit
ATM network 5000 through 5106 and ATM physical layer processing unit 5107
Send to.

Similarly, in the transmission terminal device B5200, the counter 5203 is set to the maximum value "167772 when making a call request.
15 ", and this value" 16777215 "is added to the data in the data packet assembling / disassembling processing control unit 5202. Then, this data is added to the AAL processing unit 5205, AT.
It is transmitted to the ATM network 5000 through the M cell processing unit 5206 and the ATM physical layer processing unit 5207.

On the other hand, in the receiving terminal device 5300, these calling requests are sent to the ATM physical layer processing section 5307 and ATM.
Through the cell processing unit 5306 and the AAL processing unit 5305, it is sent to the data packet assembly / disassembly processing control units 5302A and 5302B provided for each application 5301A and 5301B. Here, each data packet assembly / disassembly processing control unit 5302A, 53
02B decomposes the data into a data part and a time stamp part, and sends the data part as is to applications 5301A and 5301B. The data of the time stamp portion contains the maximum value of the counters 5103 and 5203 added to the data between the respective transmission terminal devices 5100 and 5200. This data is sent to the counter comparison control unit 5304. This counter comparison controller
The maximum value "65535" that can be expressed by the counter 5303 of the receiving terminal device 5300 is set in the 5304 in advance. In this counter comparison control unit 5304,
Those three values, "255" and "16777215"
And "65535" are compared and the minimum value is selected. The selected minimum value is the value of the three transmitting / receiving terminal devices 51.
It is the maximum value that can be represented by each of 00, 5200, 5300. Therefore, in this case, values up to "255" can be represented by the three terminals of all the transmitting / receiving terminal devices 5100, 5200, 5300. In this case, the number that can be represented by the counter 5303 of the receiving terminal device 5300 is
The counter 5303 of the receiving terminal device 5300 is reset to 0 from this counter comparison control unit 5304 except when it is smaller than the number that can be expressed by all the transmitting terminal devices 5100 and 5200.

In this embodiment, (the maximum value that can be represented by the counter 5203 of the transmission terminal device B5200)>
(Maximum value that can be represented by the counter 5303 of the receiving terminal device 5300), but (maximum value that can be represented by the counter 5103 of the transmitting terminal device A5100) <(receiving terminal device
The maximum value that can be expressed by the counter 5303 of the 5300), the counter 5303 of the receiving terminal device 5300 is reset to 0.

The conditions for resetting to 0 are as follows. If there is even one transmitting terminal device that satisfies this condition, the counter of the receiving terminal device is reset to 0.

(Maximum value that can be represented by the counter of the transmitting terminal apparatus) <(Maximum value that can be represented by the counter of the receiving terminal apparatus) If there is no transmitting terminal apparatus that satisfies this conditional expression, reset 0. Not performed.

These processes are performed by the receiving terminal device 5300.
Response to the call request from the application 5301 of
This is done before sending back to each sending terminal device 5100, 5200. Further, in the counter comparison control unit 5304, the counter 53
When incrementing 03, when the counter value becomes "256", so-called "0 clear" is performed to initialize the counter.

In the data packet assembly / disassembly processing control units 5302A and 5302B, the respective applications 5301A and 5301B are
Receives the minimum value 255 selected by the counter comparison control unit 5304 and the value of the counter 5303 when sending back a response to the call request to each of the transmitting terminal devices 5100 and 5200, and obtains the AAL together with the response to the call request. Processing unit 5305,
ATM cell processing unit 5306 and ATM physical layer processing unit 53
It is sent to each transmission terminal device 5100, 5200 through the ATM switching network 5000 through 07.

On the transmitting terminal device 5100, 5200 side, A
TM physical layer processing units 5107 and 5207, ATM cell processing unit 51
A response to the calling request is sent to the data packet assembly / disassembly processing control units 5102 and 5202 through 06, 5206 and AAL processing control units 5105 and 5205. In response to the call request, in the data packet assembly / disassembly processing control unit 5102, 5202,
The data part is decomposed into the data part and the time stamp part, and the data part containing the response to the call request is directly passed to the applications 5101 and 5201. The time stamp portion contains the counter value of the receiving terminal device 5300 and the minimum value "255" selected by the counter comparison controller 5304.
In addition, the data packet assembly / disassembly processing control unit 5102,5202
Then, as in the first embodiment described above, the counters 5103 and 5203
The processing for making the value of the same as the value of the counter 5304 of the receiving terminal device 5300 is performed by the same procedure.

In the first embodiment described above, the counters are initialized to 0 when each transmission terminal device makes a call request, but in the second embodiment, the counters 5103 and 5203 are set to the maximum value. Therefore, when the response to the call request is returned, the value obtained by adding 1 to the counter value can be regarded as the round-trip time from the call request until the response is returned, so this value is halved. By adding this value to the counter value in the data of the time stamp portion, it is possible to set the same value as the counter value of the receiving terminal device 5300.

Further, in the data packet assembling / disassembling process control units 5102 and 5202, one of the data of the time stamp unit, "255", is set in the counter reset units 5104,5204. These counter reset units 5104,5204 monitor the values of the counters 5103,5203 and
When 5103,5203 is incremented, its value is "25
When it becomes 6 ", it is cleared to 0. The other operation procedures are the same as those in the first embodiment.

(Effect 2) As a result, by using only the number of bits that can be expressed by all the counters even when the number of bits that can be expressed by the counters and the number of digits in each terminal device are different, each terminal can be used. It is possible to control so that data is processed in the order in which the application of the sending terminal device sends it out, not in the order in which the data is sent to the receiving terminal device, without being affected by the device. It is possible to perform data processing on the receiving terminal device side in time series without receiving the difference in the transmission delay.

(Third Embodiment) FIGS. 3 and 4 show a third embodiment according to the present invention. First, the data flow will be described with reference to the configuration diagram of FIG.

The counter values among the transmission terminal device A1100, the transmission terminal device B1200, and the reception terminal device 3300 are set at the time of a call request, as in the first embodiment described above. In addition, the processing waiting counter value holding units 3303A and 3303B and the processed counter value holding unit 3309 are
Initialize to 0 ".

Also, a procedure for sending out data in a plurality of transmitting terminal devices and a receiving terminal device 3300
In the above, the data is transferred to the ATM physical layer processing unit 1307, the ATM cell processing unit 1306, and the AAL processing unit 1305.
Data packet assembly / disassembly processing control unit 3302 which differs for each C
The procedure of sending to A, 3302B is also the same as in the first embodiment.

In the following description, the transmission terminal device A11
It has been described that the data sent from 00 is sent to the data packet assembly / disassembly processing control unit 3302A, and the data sent from the transmission terminal device B1200 is sent to the data packet assembly / disassembly processing control unit 3302B. .

As new components different from the above-described first and second embodiments, in the transmission terminal device A1100 and the transmission terminal device B1200, there are a memory 1104 and a memory 1204. These memories 1104 and 1204 are data packet assembly / disassembly processing control units 1102 and 1202, respectively.
It is connected to the.

In the receiving terminal device 3300, FIFO memories 3304A and 3304B, processing waiting counter value holding units 3303A and 3303B, a comparator 3308, a processed counter value holding unit 3309, and an output discard control unit 3310 are included.

These FIFO memories 3304A and 3304B are data packet assembly / disassembly processing control units 3302A and 3302, respectively.
B is further connected to the processing wait counter value holding units 3303A and 3303B, the processed counter value holding unit 3309, and one output discard control unit 3310. Also,
One comparator 3308 is provided with the processing waiting counter value holding unit 33.
03A, 3303B and one processed counter value holding unit 3309 are connected.

Furthermore, each FIFO memory 3304A, 3304B is connected to an application 3301A, 3301B, respectively, and supplies a series of data streams in the order stored in this memory.

Next, the operation of these main components will be described.

Data packet assembly / disassembly processing control section 3302
The A, 3302B sends the actual data sent to the FIFO memories 3304A, 3304B and the counter value of the sending terminal device A1100 added to the time stamp section (not shown).

The FIFO memories 3304A and 3304B control the transmission and discarding of data to and from the applications 3301A and 3301B by the output discard control unit 3310.
When transmitting data to A, the counter value of the transmitting terminal device A 1100 added to the time stamp section is sent to the processed counter value holding section 3309.

Further, the processing waiting counter value holding unit 3303A, 333
03B obtains the counter value of the data that has not been transmitted to the applications 3301A and 3301B from the FIFO memories 3304A and 3304B, and sends this value to the comparator 3308.

The comparator 3308 is a processing waiting counter value holding unit.
Of the data sent from the 3303A and 3303B, the minimum value is compared with the value sent from the processed counter value holding unit 3309, and this result is sent to the output discard control unit 3310.

From the explanatory view of FIG. 4, the following can be seen. That is, the data transmitted when the counter value of the transmitting terminal device A1100 is "100" has a delay amount of one count-up, and the receiving terminal device 3300
It indicates that the data packet assembling / disassembling process control unit 3302A has reached the counter value "101" (= 100 + 1).

Similarly, the data transmitted at the counter value "100" of the transmitting terminal device B1200 has a delay amount of 4 count-up, and the data packet assembling / disassembling processing control unit 3302B of the receiving terminal device 3300 has a delay amount of 4 count up. It indicates that the counter value "104" has been reached.

Subsequently, referring to FIGS. 3 and 4,
The actual processing procedure will be described.

First, as shown in FIG. 4, when the counter value of the counter 1303 of the receiving terminal device 3300 is "101", the data packet assembling / disassembling process control unit 3302A
Data arrives at the data section (not shown)
And a time stamp section (not shown) and sends it to the FIFO memory 3304A. A counter value "100" is added to the data of the time stamp portion. The processing waiting counter value holding unit 3303A displays this counter value "100".
Is acquired and this value is sent to the comparator 3308.

The comparator 3308 has the counter value "100".
And the value 0 of the processed counter value holding unit 3309 (at initialization)
And the comparison result is sent to the output discard control unit 3310.

In the output discard control unit 3310, in the case of (data of the processing waiting counter value holding unit 3303A)> (data of the processed counter value holding unit 3309), the FIFO memory 3304
Since the output is permitted to A, the data in the data section is sent to the application 3301A and processed without delaying the data. Further, the processed counter value holding unit 3309 stores the counter value "10" which is the data of the time stamp unit.
0 "is sent.

When the count value of the receiving terminal device 3300 is "
In the case of 102 "and" 103 ", the processing is performed in the same procedure as described above, and the data is sent to the application 3301A for processing without delaying the data and finally processed by the processed counter value holding unit 3309. Is the counter value "10
2 "will be sent.

The count value of the receiving terminal device 3300 is "
In the case of 104 ", the data packet assembly / disassembly processing control unit 3302A and the data packet assembly / disassembly processing control unit 3302B
Data arrives at the two of them, and the data decomposed into the data part and the time stamp part are FIFO memories 3304A and 3304B.
Sent to. The processing waiting counter value holding unit 3303A has a counter value "103" which is data of the time stamp unit.
The processing waiting counter value holding unit 3303B acquires the counter value "100" which is the data of the time stamp unit and sends this value to the comparator 3308.

In the comparator 3308, the counter value "1"
The smaller one of 03 "and" 100 ", that is," 100 "is compared with the value" 102 "of the processed counter value holding unit 3309, and the result is sent to the output discard control unit 3310.

Since the relationship of (data of the processing waiting counter value holding unit 3303B) ≦ (data of the processed counter value holding unit 3309) is established, the output discard control unit 3310 discards the data of the FIFO memory 3304B. Also, the count value of the discarded data is not sent to the processed counter value holding unit 3309. Further, in this case, the output is not permitted to the FIFO memory 3304A, and the data remains stored in the memory.

Count value of receiving terminal device 3300 "1
In the case of 05 "and" 106 ", the same processing as in the case of the count value" 103 "is performed, the data in the FIFO memory 3304B is discarded, the output is not permitted in the FIFO memory 3304A, and the data is stored in the memory. It remains stored in.

Count value of receiving terminal device 3300 "1
In the case of 07 ", the processing waiting counter value holding unit 3303A has a counter value" 106 ", and the processing waiting counter value holding unit 3303B
Acquires the counter value "103" and compares this value with the comparator 3308
Send to

In this comparator 3308, the counter value "10"
The smaller one of 6 "and" 103 ", that is," 103 "is compared with the value" 102 "of the processed counter value holding unit 3309,
This result is sent to the output discard control unit 3310.

Since the relationship of (data in the processing waiting counter value holding unit 3303B)> (data in the processed counter value holding unit 3309) is established, the output discard control unit 3310 permits the data output to the FIFO memory 3304A and the FIFO memory 3304B. I do. In the FIFO memory 3304A, the data of three minutes, that is, the data when the counter values of the transmitting terminal device A1100 are "103", "104" and "105" are still stored, but output permission is performed. If the counter value is “103”, only the data when the counter value is “103” is output.

Thereafter, by the same procedure, when the following expression is satisfied, output is permitted. (Processing wait counter value holding unit 3303A counter value and processing wait counter value holding unit
The smaller data of the counter values of the 3303B)> (the data of the processed counter value holding unit 3309).

In addition, (processing waiting counter value holding unit 3303A
Of the counter value of (1) and the counter value of the processing waiting counter value holding unit 3303B, whichever is smaller) ≦ (data of the processed counter value holding unit 3309), the comparator 3308
The data in the FIFO memory having the smallest counter value compared by is “discarded”, the output is not permitted for other data, and the data remains stored in the FIFO memory.

(Effect 3) As a result, the data sent after the call request is processed in the order in which the applications 1101 and 1201 sent out, not in the order in which the data was sent to the receiving terminal device 3300. In addition, there is no inconsistency in the initial stage, without being affected by the difference in transmission delay on the network between the plurality of transmitting terminal devices,
Data processing can be performed on the receiving terminal device side in time series.

(Fourth Embodiment) FIG. 6 is a diagram showing a configuration in which the transmission terminal device A1100, the transmission terminal device B1200, the transmission terminal device C1300, and the reception terminal device 1400 perform transmission while synchronizing the media.

Counters 1103, 1203, 1303, 1403 in FIG.
Is sufficiently slower than the system clock 1150, 1250, 1350, 1450 of each terminal device, and the count-up cycle of the common frequency (for example, every 1/1000 second) is the count-up cycle creating unit 1151, 1
It is created by 251,1351,1451. Then, the counters 1103, 1203, 1303, 1403 are incremented using this count-up cycle.

Further, FIG. 7 shows the transmitting terminal device A110.
0, the transmission terminal device B1200, the transmission terminal device C1300, and the reception terminal device 1400 perform the operations for transmitting while synchronizing the media.

FIG. 8 shows the transmitting terminal device A110.
0, the data of the counter value added to the data of the transmission terminal device B1200 and the transmission terminal device C1300,
The timing at which the receiving terminal device 1400 is reached or processed is shown.

A detailed description will be given below with reference to FIGS. 6, 7 and 8.

When the application 1101 (1201, 1301) of the transmitting terminal device A 1100 (1200, 1300) makes a call request to the receiving terminal device 1400, the call request is first made by the packet processing control unit 1102 (shown in FIG. 6). 1202, 1302).

The "application" described here is
Transmission terminal device A1100 and transmission terminal device B
In 1200, for example, the left and right images captured from the camera are transmitted to the network, in the transmission terminal device C1300, for example, the voice captured from the microphone is transmitted to the network, and in the reception terminal device 1400, for example, It is like displaying video or presenting audio.

In the packet processing control unit 1102 (1202, 1302), the counter 1103 (1203, 1303) of the transmitting terminal device A1100 (1200, 1300) is used when the call request is passed to the packet processing control unit 1102 (1202, 1302). ) Is initialized to 0. At the same time, a call request processed by the packet processing control unit 1102 (1202, 1302) is sent to the AAL processing unit 1105 (1205, 1302) as shown in FIG.
5), the ATM cell processing unit 1106 (1206, 1306), the ATM physical layer processing unit 1107 (1207, 1307) are processed in this order,
It is transmitted to the receiving terminal device 1400 via the switching network 1000.

The calling request transmitted to the receiving terminal device 1400 via the ATM switching network 1000 in this way is transmitted to the ATM physical layer processing unit 1407 of the receiving terminal device 1400.
It is transmitted to the cell processing unit 1406 and the AAL processing unit 1405.

The AAL processing unit 1405 distributes the call origination request for each VC (virtual circuit), and transmits it to the applications 1401A, 1401B, 1401C through the packet processing control units 1402A, 1402B, 1402C different for each VC. This packet processing control unit is prepared for each of the applications 1401A, 1401B, 1401C. At the same time, the packet processing control units 1402A (1402B, 1402C) initialize the delay table 1408 to 0.

In the application 1401A (1401B, 1401C), the process of transmitting a reply to the transmission terminal devices 1100 (1200, 1300) as to whether or not the connection can be "established" in response to the call request for each VC is performed. In this embodiment, it is assumed that the connection between the transmission terminal device A1100, the transmission terminal device B1200, and the transmission terminal device C1300 can be established.

Applications 1401A, 1401B, 1401C of the receiving terminal device 1400 are three receiving terminal devices A.
In order to send a response to the call request to 1100 and the transmission terminal devices B1200 and C1300, the response to the call request is sent to each of the packet processing control units 1402A, 1402B and 1402C.

Each packet processing control unit 1402A, 1402B, 14
In 02C, the current counter value of the receiving terminal device 1400 is acquired from the counter 1403 (specifically, “234”, “239”, and “237” in the example of FIG. 7), and the data including the counter value is acquired. Packet and AAL processing unit 14
Send to 05. The data transmitted to the AAL processing unit 1405 includes the ATM cell processing unit 1406 and the ATM physical layer processing unit 14.
It is processed in the order of 07 and transmitted to each transmission terminal device 1100, 1200, 1300 via the ATM switching network 1000.

First, the processing in the transmission terminal device A1100 will be described.

In the transmitting terminal device A1100, the ATM physical layer processing unit 1107, AT
It is transmitted to the packet processing control unit 1102 through the M cell processing unit 1106 and the AAL processing unit 1105. The packet processing control unit 1102 decomposes the data unit, which is a response to the call request, and the time stamp unit including the count value of the receiving terminal device 1400, and the data unit is transmitted to the application 1101. At the same time, using the data of the time stamp portion, the transmitting terminal device A1100 and the receiving terminal device 14
Performs processing to make the 00 counter values the same.

In this transmission terminal device A1100, since the counter 1103 is initialized when making a call request, the counter 1103 counts up from the current counter value until a response is returned after making a call request. You can know what you did. In the example shown in FIG. 7, the counter value from the call request until the response is returned is "2", and this value is the time required for the round trip between the sending terminal device A1100 and the receiving terminal device 1400. Therefore, it can be considered that one-way counts up by one.

Therefore, by adding "1" to the data of the time stamp portion, the current counter value ("235") of the transmitting terminal device 1400 can be predicted on the transmitting terminal device A1100 side, so that the transmitting terminal device A1100 can be predicted. The system clock of the transmitting terminal device A1100 is set so that the counter value of the A1100 becomes the same value as the counter value ("235") of the receiving terminal device 1400.

Here, for convenience of explanation, the delay between the transmitting and receiving terminal devices is an "even number", and the amount of delay is small, but in reality it passes through several ATM switches through the ATM network. , The amount of delay is much larger. Therefore, the delay amount between the transmission / reception terminal devices becomes "odd", and even if it is not divisible, the value may be "rounded up" or "rounded down".

On the other hand, the transmitting terminal device B1200 and the transmitting terminal device C1300 also perform the same procedure as described above to set the counter 1203 and the counter 1303, and perform the processing to make the same value as the counter 1403 of the receiving terminal device 1400. . By performing such processing, all the counter values of the transmission terminal devices 1100, 1200, 1300 and the reception terminal device 1400 become the same. Furthermore, each transmission terminal device 1100, 1200, 1300 can know the transmission delay up to the reception terminal device 1400.

At this time, each transmitting terminal device 110
In the application 1101,1201,1301 of 0,1200,1300,
The establishment of the connection with the receiving terminal device 1400 can be recognized in the response to the call request from the packet processing control units 1102, 1202, 1302. Therefore, next, application 1101,120 of each transmitting terminal device 1100,1200,1300
At 1,1301, actual data transmission to the receiving terminal device 1400 is started.

In each of the transmission terminal devices 1100, 1200, 1300, the counter value set to the same value as the counter value of the reception terminal device 1400 is added when actual data is transmitted, and data transmission is performed. With this addition, each of the transmission terminal devices 1100, 120 on the reception terminal device 1400 side.
You can see when 0,1300 is the transmitted data.

In order to explain a series of "synchronization system" below, the transmission delay of the transmission terminal device A1100 and the reception terminal device 1400 is one counter clock, and the transmission delay of the transmission terminal device B1200 and the reception terminal device 1400 is six. Counter clock, transmission terminal device C1300
The description will be made assuming that the transmission delays of the reception terminal device 1400 and the reception terminal device 1400 are 4 counter clocks.

The data transmitted from each transmission terminal device 1100, 1200, 1300 is the AT of the reception terminal device 1400.
M physical layer processing unit 1407, ATM cell processing unit 1406, AA
The data is transferred to the L processing unit 1405, and is transmitted to the packet processing control units 1402A, 1402B, 1402C different for each VC.

In this example, the data transmitted from the transmission terminal device A1100 is transmitted to the packet processing control unit 1402A, and the data transmitted from the transmission terminal device B1200 is transmitted to the packet processing control unit 1402B. The description will be made assuming that the data transmitted from the C1300 is transmitted to the packet processing control unit 1402C.

First, when the counter value of the receiving terminal device 1400 is "249", the first data is transmitted to the packet processing controller 1402A.

The data packet transmitted to the packet processing controller 1402A is decomposed into a data part and a time stamp part. In this time stamp part, the counter value added when the sending terminal device A1100 sends data
248 "is added.

In the packet processing control unit 1402A, first, the counter value "248" added to the time stamp unit.
And the current counter 1403 value of the receiving terminal equipment 1400 "
249 "are compared, the difference" 1 "is stored in the delay table storage area 1408A, and the data itself is transmitted to the delay processing unit 1409A.

The delay table 1408 has an area 1408 for storing the transmission delay for each of the packet control processing units 1402A, 1402B, 1402C.
A, 1408B, 1408C are provided. In the delay table 1408, a comparison is made with the already stored value, and the value is stored unless the newly stored value is small. Note that, here, since the delay table 1408 has already been initialized at the time of a call request, "0" is stored.

The delay processing unit 1409A performs "delay processing" for the count-up cycle in order to synchronize the data transmitted from the packet processing control unit 1402A with the data transmitted to other applications. Delay processing unit 14
09A is delayed by the count-up cycle of the difference between the maximum value stored in the delay table storage areas 1408A, 1408B, and 1408C and the value stored in 1408A. Here, "1" is set in each of the delay table storage areas 1408A, 1408B, 1408C.
, "0", "0" are saved, so its maximum value "
1 "and the value" 1 "stored in the delay storage unit 1408A" 0 ", that is, the count-up is performed without delay processing of data.
Data is sent to 01A for processing. (See Figure 8).

Next, at the time of the counter values "250", "251", and "252" of the receiving terminal device 1400, since only the data from the transmitting terminal device A1100 is transmitted to the receiving terminal device 1400, Similar to the processing, the data is transmitted to the application 1401A and processed without delay processing of the data.

Next, when the counter value of the receiving terminal device 1400 is "253", data is transmitted to the packet processing control units 1402A and 1402C. Then, in the packet processing control unit 1402A, the counter value "252" added to the time stamp unit and the receiving terminal device 14
The current value "253" of the counter 1403 of 00 is compared, the difference "1" is stored in the delay table storage area 1408A, and the data itself is transmitted to the delay processing unit 1409A.

In the packet processing control unit 1402C, the counter value "249" added to the time stamp part and the current value of the counter 1403 of the receiving terminal device 1400 "25"
3 "are compared, and the difference" 4 "is stored in the delay table storage area.
Save the data to the 1408C and delay the data itself
Send to 1409C.

As a result, the delay table storage areas 1408A, 14
Since "1", "0", and "4" are stored in 08B and 1408C, respectively, delay table storage areas 1408A, 1408B, and 14
The maximum value of the data in 08C is "4", and the delay processing unit 140
In 9A, in order to perform "3" count-up period "data delay" from operation 4-1 = 3, when the counter value of the receiving terminal device 1400 is "253", data is not output to the application and reception is performed. Terminal equipment 14
When the counter value of 00 reaches "256", data is output to the application 1401A.

In the delay processing unit 1409C, the calculation 4-4
Since = 0, when the counter value of the receiving terminal device 1400 is "253", data is output to the application 1401C and processed without "data delay".

Therefore, at this point, the value 2 which is reached when the counter value of the receiving terminal device 1400 is "252" is reached.
Only one of the data will be processed by the application. At the time of the counter values "254" to "257" of the receiving terminal device 1400, the data is transmitted to the packet processing control units 1402A and 1402C as described above. Here, the same processing as described above is performed, the delay processing unit 1409A delays each data by 3 count-up cycles, and the data after the delay processing is sequentially output.

The delay processing unit 1409C outputs data sequentially without performing data delay processing.

Since the counter value of the receiving terminal device 1400 is "256", the counter values of the data output from the delay processing units 1409A and 1409C are both "252". So-called “synchronization” can be achieved between applications.

Next, when the counter value of the receiving terminal device 1400 is "258", data is transmitted to the packet processing control units 1402A, 1402B, 1402C.

First, in the packet processing control unit 1402A, the counter value "257" added to the time stamp unit.
And the current counter 1403 value of the receiving terminal equipment 1400 "
258 "is compared, the difference" 1 "is stored in the delay table storage area 1408A, and the data itself is transmitted to the delay processing unit 1409A.

Further, in the packet processing control unit 1402B, the counter value "252" added to the time stamp unit.
And the current counter 1403 value of the receiving terminal equipment 1400 "
258 "is compared, the difference" 6 "is stored in the delay table storage area 1408B, and the data itself is transmitted to the delay processing unit 1409B.

Similarly, in the packet processing control unit 1402C,
Counter value added to the time stamp part "25
4 "is compared with the current value" 258 "of the current counter 1403 of the receiving terminal device 1400, the difference" 4 "is stored in the delay table storage area 1408C, and the data itself is transmitted to the delay processing unit 1409C.

As a result, the delay table storage area 1408A,
Since "1", "6", and "4" are stored in the 1408B and 1408C, respectively, the delay table storage area 1408A, 1408B, 14
The maximum value of the data in 08C is "6", and the delay processing unit 140
In 9A, a data delay of "5" count-up cycle is performed from calculation 6-1 = 5. Therefore, when the counter value of the receiving terminal device 1400 is "258", data is not output to the application, and the receiving terminal device 1400 does not output data.
When the counter value of is "263", application 14
Output data to 01A.

In the delay processing unit 1409B, calculation 6-6 is performed.
As a result of = 0, data is output to the application 1401B and processed without delaying the data.

Similarly, the delay processing unit 1409C calculates 6-4.
= 2, a delay of "2" count-up cycle is performed, data is not output to the application at this point, and the counter value of the receiving terminal device 1400 is "260".
At that time, data is output to the application 1401C.

At this point, in the delay processing unit 1409A, the counter value "254" during the delay processing is being performed.
, "255" data, delay processing time is calculated 6-4
= 2, the count value has increased by "2" count-up cycle. Therefore, a data delay of 2 count-up cycle is further performed, and the counter value of the receiving terminal device 140 0 is "26".
When it is 0 ", data is output to the application 1401A (see FIG. 8).

Counter value of receiving terminal device 1400 "2
The data after 59 "is processed in the same manner as described above, the delay processing unit 1409A delays each data by" 5 "count-up cycle, and the delay processing unit 1409C counts each data by" 2 ". Delay for a period,
The data after delay processing is sequentially output.
Also, the delay processing unit 1409B outputs data sequentially without performing data delay processing.

It should be noted that the delay processing units 1409A, 1409B, 1409C have been started since the counter value "260" of the receiving terminal device 1400.
The counter values of the data output from both are "254"
This means that from this point on, the applications can be "synchronized".

As described above, from this point onward, the applications 1101, 1201, 1301 are processed according to the order of data transmission, so that the transmission delays on the network may affect the transmission terminal devices. Instead, the data processing can be performed on the receiving terminal device side in time series.

Next, description will be made regarding the processing in the case where each application 1101, 1201, 1301 on the transmission terminal device side issues a "disconnection request" at each timing.

The data transmitted from the transmitting terminal device A1100 is the counter value "13" of the receiving terminal device 1400.
By the time "00", the delay processing unit 1409A displays "1295-
The data of the counter value up to 1299 "is" 1-
It has been stored after being subjected to a delay process for a count-up cycle of 5 ".

The data transmitted from the transmitting terminal device C1300 is "1" in the delay processing unit 1409C by the time the counter value "1300" of the receiving terminal device 1400 is reached.
The data of the counter value of "295" is stored after being subjected to the delay processing for the count-up cycle of "1" (see FIG. 8).

Here, the data reaches when the data requested by the transmitting terminal device B1200 for the disconnection is the counter value "1301" of the receiving terminal device 1400. This time,
Since the packet processing control unit 1402B is a disconnection request, "0" is stored in the delay table storage area 1408B. Therefore, "1", "0", and "4" are stored in the delay table storage areas 1408A, 1408B, 1408C, respectively,
The maximum value of the data in the delay table storage areas 1408A, 1408B, 1408C is "4". Here, the delay processing units 1409A and 1409
In C, the counter value of the receiving terminal device 1400 is "13.
Until "00", delay processing of "5" and "2" was performed, but the counter value of receiving terminal device 1400 was "1".
Since the maximum value of the delay table 1408 becomes "4" from the time of 301 ", it changes to performing the delay processing of" 3 "and" 0 "respectively. Therefore, the delay processing units 1409A and 1409C are as follows. Perform any necessary processing.

Regarding the data of the counter value "1294", both the delay processing units 1409A and 1409C have the counter value "1" when the counter value "1300" of the transmitting terminal device 1400 is present.
The data of 295 "is unconditionally output because the delay process is for the count-up cycle of" 1 ".

Further, the delay processing unit 1409A carries out the delay processing of "3" at the timing of the counter value "1301" of the receiving terminal device 1400. Therefore, as a result of the calculation 5-3 = 2 in the delay processing, the count is reduced by "2" count-up period. Therefore, by this time, the next counter values "1296", "1297", "1298", "12 stored in the delay processing unit 1409A are stored.
The delay processing times of 99 "and" 1300 "are" 1 "and", "respectively.
It becomes 2 "," 3 "," 4 "," 3 ". Here, since the delay processing time is reduced by" 2 "count-up cycle, the counter value of the transmitting terminal device 1400" 13 ".
For the data stored in the delay processing unit 1409A before 00 ", processing for reducing the delay processing time by" 2 "count-up cycle is performed.

Specifically, the delay processing time of each data of the counter value is set to "-1", "0", "1", "2", respectively.
And Here, with respect to the delay processing times "-1" and "0", there is no need to perform delay processing, so data is immediately output to the application 1401A. Therefore,
When the counter value of the receiving terminal device is "1301", the delay processing unit 1409A determines that the counter value is "1295".
, "1296" and "1297" are output.

The same processing is also performed on delay processing section 1409C.

The delay processing unit 1409C does not perform the delay processing of "0", that is, the delay processing at this timing. Therefore, up to this point, the data "1296" and "1297" stored in the delay processing unit 1409C do not need to be subjected to delay processing, so that the application 14
Output to 01C.

Therefore, at the time when the counter value of the receiving terminal device is "1301", the delay processing unit 1409A has three counter values of "1295", "1296", and "1297".
Two data will be output.

Therefore, the data for which it is no longer necessary to perform delay processing is immediately transmitted to the application while maintaining synchronization, and as a result, it is not necessary to store unnecessary data.

(Fifth Embodiment) Only portions different from the above-described fourth embodiment will be described below.

In the fourth embodiment, each transmission / reception terminal device performs data communication using a common frequency count-up cycle (for example, every 1/1000 second), but the counter increment timing (1/10
Since data is not always transmitted every (00 seconds), in this example, a case where the transmission terminal device adds the same counter value and transmits it will be described.

FIG. 9 shows a transmission terminal device A1100, a transmission terminal device B1200 and a transmission terminal device C1300.
FIG. 3 is a configuration diagram when a reception terminal device 1400 and a receiving terminal device 1400 perform transmission while synchronizing media.

As shown, each transmitting terminal device 110
0,1200,1300 counter value discrimination control unit 1110,1210,1310
Are connected to the packet processing control units 1102, 1202, 1302 and the counters 1103, 1203, 1303, respectively.

Similar to the above-described fourth embodiment, each terminal device 1100, 1200, 1300 acquires the counter value of the receiving terminal device 1400 at the time of a call request, and each counter 110
The value is set to 3,1203,1303, the counter value is added to the transmission data, and the data is transmitted. At this time, the counter value determination control unit 111 of each transmission terminal device 1100, 1200, 1300
0, 1210, 1310 check the counter value added to the transmission data, and when the transmission data having the same counter value is generated, add the "sub-counter value" to the transmission data. This sub-counter value is a sequential value (for example, a, b, c) for each counter value added to the transmission data.
…)

Here, the case where there are two data to be transmitted when the transmission terminal device A1100 has the counter value "300" (not shown) will be described.

The transmitting terminal device A1100 adds the counter value "300" to the data when transmitting the data.
At this time, the counter value determination control unit 1110 determines whether the counter value added to the data is the same as the counter value added to the previous data. Here, when the data is different from the immediately preceding data, only the counter value is added to the data and transmitted as in the fourth embodiment described above.

Next, when the data is transmitted again when the counter value is "300", the counter value is the same as the counter value added to the immediately preceding data. Append "a". Therefore, the data added to the transmission data is "300a".
Becomes

The receiving terminal device 1400 sends this data
When 300 "and" 300a "are received, when the packet processing control unit 1402A decomposes the data portion and the time stamp portion, there are two pieces of data having the counter value" 300 ", and The delay processing unit 1409A thereafter outputs two data at the timing of outputting the data of the counter value "300", and as a result, synchronizes with other data. Will be possible.

Therefore, even when the counter value and the data output timing do not always match, it is possible to achieve synchronization. As a result, it is possible to perform data processing on the receiving terminal device side in time series without being affected by the difference in transmission delay on the network between the plurality of transmitting terminal devices.

(Sixth Embodiment) Next, referring to FIG.
As the sixth embodiment of the present invention, only parts different from the above-described fourth embodiment will be described below.

When each transmitting terminal device 1100, 1200, 1300 makes a call request to the receiving terminal device 1400, it initializes its own counter 1103, 1203, 1303 to "0" to determine the delay amount with the receiving terminal device. calculate. Then, when the VC is established and the first data is transmitted to the receiving terminal device 1400, the delay amount is added to the data and transmitted. Hereinafter, the transmission delays of the respective transmission terminal devices 1100, 1200, 1300 are "1", "6", "4", respectively, the transmission terminal device A1100 is in communication, and then the transmission terminal device C1300, transmission terminal device B1200. The following description will be made assuming that the call request is transmitted and the transmission is started.

The transmission delay of the transmission terminal device A1100 is "
Since it is 1 ", the value is added to the first data after the call request and transmitted.

In the receiving terminal device 1400, the data is decomposed into the actual data and the transmission delay amount "1" by the packet processing control unit 1402A, and the actual data is divided into the application 1401A and the transmission delay amount 1 Send to the delay table storage area 1408A. Delay table storage area 1408
B, 1408C has data "0" initialized at the time of calling request
Is stored, the delay table 1408 displays "1", "
At this time, the response control unit 1420 does not perform any processing because the transmitting terminal device A1100 is the only transmitting terminal device communicating with the receiving terminal device 1400 at this point.

Next, the transmission terminal device C1300 starts transmission after making a call request. The delay amount "4" of the transmitting terminal device C1300 is also the receiving terminal device 14 as in the above process.
Since it is transmitted to 00 and stored in the delay table storage area 1408C, the delay table 1408 has "1", "0", "4".
Becomes At this time, the response control unit 1420 compares the delay amount of the transmission terminal devices A1100 and C1300 with which communication is established with the maximum delay amount “4” in the delay table 1408. As a result, the data of the transmission terminal device A1100 is calculated as 4-1.
= 3, a delay of "3" count-up clock is required, and the data of the transmission terminal device C1300 is calculated by calculation 4-4 = 0, and thus delay processing is not required.

Therefore, the transmission terminal device A1100
In order to have the delay processing of the 3 ″ count-up clock performed, “delay request data” for 3 count-up clocks is transmitted to the packet processing control unit 1402A. The delay request data includes a destination, delay data (however, "3" in the above case), and the like.

On the other hand, the packet processing control unit 1402A which has received this delay request data sends this data to the AAL processing unit.
1405, ATM cell processing unit 1406, ATM physical layer processing unit
1407, and transmits to the transmission terminal device A 1100 through the ATM network 1000.

The transmission terminal device A 1100 recognizes that this data is delay request data for "3" count-up clock when it reaches the packet processing control unit 1102. After that, in the packet processing control unit 1102, all the transmission data is transmitted to the delay processing unit 1120, and the delay processing unit 1120 performs delay processing for "3" count-up clock, and then the AAL processing unit 1105. The ATM cell processing unit 1106 and the ATM physical layer processing unit 1107 perform processing in order, and
The data is transmitted to the receiving terminal device 1400 via the TM network 1000.

As a result, the transmission terminal device A1100 performs the delay process, and "data can be synchronized" with the transmission terminal device C1300.

Assuming that the transmitting terminal device B1200 has started transmission after the call request in the so-called "when synchronized", the delay amount 6 of the transmitting terminal device B1200 is also received in the same manner as the above process. Terminal equipment 1400
And is stored in the delay table storage area 1408B, the delay tables are "1", "6", and "4". At this time, the response control unit 1420 determines the delay amount of the transmission terminal devices A1100, B1200, C1300 with which communication is established,
The maximum delay amount 6 in the delay table 1408 is compared. As a result, the data of the transmission terminal device A1100 is calculated 6-
A delay of "5" count-up clock as a result of 1 = 5 is required, and data of the transmission terminal device C1300 needs a delay of "2" count-up clock from the result of operation 6-4 = 2. Similarly, the data of the transmission terminal device B1200 is calculated as 6-6 = 0, which means that delay processing is not required.

Therefore, the transmission terminal device A1100
In order to perform delay processing of the 5 "count-up clock, the delay request data for the" 5 "count-up clock is transmitted to the packet processing control unit 1402A. Also, the delay of the" 2 "count-up clock is transmitted to the transmitting terminal device C1300. In order to have the processing performed, the delay request data of "2" count-up clock is transmitted to the packet processing control unit C1300.

[0208] The packet processing control unit 1402A and the packet processing control unit 1402C that received the delay request data described above.
Sends this data to the ALL processor 1405, ATM cell processor
1406, the ATM physical layer processing unit 1407, and the ATM network
Send through 1000 to the sending terminal device A1100.
The transmission terminal device A 1100 recognizes that this data is delay request data for "5" count-up clock when it reaches the packet processing control unit 1102.

Thereafter, in the packet processing control unit 1102, all the transmission data is transmitted to the delay processing unit 1120, and the delay processing unit 1120 performs delay processing for "5" count-up clock, and then the AAL processing unit. 1105, ATM cell processing unit
1106, the ATM physical layer processing unit 1107, and the ATM network
Send to the receiving terminal device 1400 through 1000.

Similarly, in the transmission terminal device C1300,
When this data reaches the packet processing controller 1302 "
It is recognized that it is the delay request data for 2 "count-up clock. After that, the packet processing control unit 1302 transmits all the transmission data to the delay processing unit 1320,
The delay processing unit 1320 performs delay processing for "2" count-up clocks, and then the AAL processing unit 1305, ATM cell processing unit 1306, and ATM physical layer processing unit 1307,
It transmits to the receiving terminal device 1400 through the ATM network 1000.

Therefore, in the receiving terminal device 1400,
Since the data from each transmission terminal device 1100, 1200, 1300 has already been transmitted after the "synchronization processing" as described above has been performed, it is possible to synchronize without performing any special processing. Becomes

Next, the setting for the "disconnection request" will be described.

The operation when the transmission terminal device B1200 having the largest transmission delay amount issues a "disconnection request" will be described in detail below.

When the transmission terminal device B1200 makes a disconnection request, the value of the delay table storage area 1408B of the reception terminal device 1400 is "initialized" to "0". Therefore, the values in the delay table 1408 are "1", "0", and "4".
At this time, the response control unit 1420 compares the data of the delay table 1408 with the maximum delay amount again because the data of the delay table 1408 has been initialized. As a result, the data of the transmission terminal device A 1100 is calculated as 4-1 = 3. A delay of 3 "count-up clock is required, and the transmission terminal device C1300
It is determined that the delay processing is unnecessary by the calculation 4-4 = 0.

Therefore, the transmission terminal device A1100
In order to have the delay processing of the 3 "count-up clock performed, the delay request data for the" 3 "count-up clock is transmitted to the packet processing control unit 1402A, and the transmission terminal device C1300 does not perform the delay processing. The delay request data of "0" count-up clock is transmitted to the control unit 1402C.

Upon receiving the delay request data, the packet processing control units 1402A and 1402C send this data to the AAL processing unit 140.
5, ATM cell processing unit 1406, ATM physical layer processing unit 140
7 and sends it to the transmitting terminal device A1100 through the ATM network 1000. And this transmission terminal device A
When the data reaches the packet processing control unit 1102, the 1100 recognizes that the data is delay request data for "3" count-up clocks.

In the packet processing control unit 1102, "as it is"
What was delayed by 5 "count-up clock changed to" 3 "count-up clock,
"5" stored in the delay processing unit 1120 up to that point
Of the data for the count-up clock, the data that should be output with the "2" count-up clock in operation 5-3 is immediately output, and the subsequent data is delayed by "3" for the count-up clock. , To the receiving terminal device 1400.

Similarly, in the transmission terminal device C1300,
When this data reaches the packet processing controller 1302 "
It is recognized that the delay request data for 0 "count-up clock, that is, the delay processing is not performed.
Therefore, the data stored in the delay processing unit 1120 up to that point is immediately output, and the subsequent data is transmitted to the receiving terminal device 1400 without delay processing.

Therefore, since the receiving terminal device does not perform special processing such as delay processing, the structure is simplified, and the transmitting terminal device performs the delaying process for the difference in the delay amount with other transmitting terminal devices. This enables synchronization, and as a result, data processing is performed on the receiving terminal device side in a time-sequential order without being affected by the difference in transmission delay on the network between multiple transmitting terminal devices. be able to.

(Seventh Embodiment) With reference to FIGS. 11 and 12, only the portions different from the above-described fourth embodiment will be described below.

The packet processing control units 1402A, 1402B and 1402C of the receiving terminal device 1400 shown in FIG.
1431 is connected. The correction control unit 1431 has a timer
1430 and counter 1403 are connected. This timer
1430 activates the correction control unit 1431 at every certain timing (for example, every 30 minutes), and the correction control unit 1431 corrects the counter values of the receiving terminal device 1400 and each terminal device 1100, 1200, 1300. The correction control unit 1431 corrects the time shift of the counter value that occurs during long-time communication.

The reception terminal device 1400 and the transmission terminal devices 1100, 1200, 1300 set counter values when making a call request, and perform communication by delay processing while referring to the values in the delay table 1408. At this time, the timer 1430 of the receiving terminal device 1400 sets the correction control unit 14 every 30 minutes.
Start up on 31.

In the correction control unit 1431 which has been activated, each transmission terminal device 11 currently in communication is
In order to reset the counter value of 00,1200,1300, the current counter value is acquired from the counter 1403, and the correction request data is transmitted to the packet processing control units 1402A, 1402B, 1402C.

Upon receiving the correction request data, the packet processing control units 1402A, 1402B, 1402C sequentially transmit this data to the AAL processing unit 1405, the ATM cell processing unit 1406, and the ATM physical layer processing unit 1407, and the data are transmitted through the ATM network 1000. Send Send to terminal devices 1100, 1200, 1300. Each transmitting terminal device 1100, 12000, 1300 recognizes that this data is correction request data when it reaches the packet processing control units 1102, 1202, 1302, and recognizes the counter value transmitted from the receiving terminal device 1400. To do. At this time, as in the case of the above-described embodiment, the communication delay is obtained by each transmission terminal device 1100, 1200, 1300 at the time of making a call request, and therefore each transmission delay is added to the transmitted counter value to determine its own. counter
Set to 1103, 1203 and 1303 respectively. After that, the corrected counter value is added to the data for communication.

Therefore, in order to correct the slight deviation of the counter value of each terminal device for each time of the timer 1430 on the receiving terminal device 1400 side, the synchronization among the transmitting terminal devices 1100, 1200, 1300 is performed. It can be more strict.

Further, in the above-mentioned embodiment, it is described that the data is output from each transmission terminal device at every count-up cycle, but here, as shown in FIG. The description will be given assuming that the count-up cycle is created so that the data is output at the timing of rotation. At this time, the counter value added to the data from the transmitting terminal device A1100 is "100" in the receiving terminal device 1400.
While the counters are incremented by one, they are "shifted" by one.

In the above case, the correction control unit 1431 is set to correct the counter value for each transmission terminal device when the deviation amount exceeds 10%. Therefore, the counter value of the receiving terminal device 1400 is compared with the data of the counter value sent from each sending terminal device 1100, 1200, 1300, and if there is a deviation amount of 10% (± 10 counters) or more, each sending Terminal equipment 1100,1200,13
Send correction request data to 00 and send each terminal device 11
Correction processing is performed by 00, 1200, 1300.

Therefore, since the correction control unit 1431 on the receiving terminal device 1400 side monitors and corrects the slight deviation of the counter value of each terminal device, the synchronization among the transmitting terminal devices 1100, 1200, 1300 is performed. It can be more strict.

(Other Modified Embodiments) In addition to the above-described first to seventh embodiments of the present invention and the modified embodiments thereof, various modified embodiments are possible without departing from the gist of the present invention. It is possible.

The above description has been based on the embodiments and modified embodiments of the present invention, but the present invention includes the following inventions.

(1) 1 from a plurality of transmission terminal devices
In an inter-media synchronization system for transmitting data to one receiving terminal device via a communication network while synchronizing, data transmission from each of at least two transmitting terminal devices among the plurality of transmitting terminal devices to the receiving terminal device is performed. A time measuring means for measuring a required data transmission time, and at least the measured time of 2
A longest data transmission time detecting means for detecting the longest time of the two data transmission times; a difference detecting means for obtaining a difference between the longest data transmission time and one of the measured data transmission times; Processing delay means for delaying the start of data processing in the receiving terminal device of data transmitted from the transmitting terminal device corresponding to one of the used data transmission times, by a difference time obtained by the difference detecting means, An inter-media synchronization system characterized by having. (Corresponding to the first embodiment and the second modification of the first embodiment).

(2) One from a plurality of transmission terminal devices
In an inter-media synchronization system that transmits data to one receiving terminal device via a communication network while synchronizing with each other, each of the transmitting terminal devices measures time with a time measuring unit and the time measuring unit. A transmission time storage means for storing a transmission time required for transmitting data from the transmission terminal device to the reception terminal device, and 1 for the data and the transmission time.
An information sending means for sending to the receiving terminal device as unit information, the receiving terminal device separating the one unit information sent from the information sending device into data and transmission time information. A longest transmission time storage means for storing the longest transmission time among the transmission times obtained by the information separating means, a longest transmission time stored in the longest transmission time storage means, and each of the above obtained by the separating means. Difference calculation means for obtaining a difference from the transmission time, data processing means for processing the data obtained by the information separation means, and data of the data obtained by the information separation means for each difference time obtained by the difference calculation means An inter-media synchronization system comprising: a processing delay means for delaying a processing start time in the data processing means. (Corresponding to the first embodiment and the second modification of the first embodiment).

(Function and Effect 2) The transmission time required for data transmission between the two terminal devices measured by the time measurement means is stored in the transmission time storage means, and the information transmission means sets the transmission time together with the data in a predetermined transmission unit. When it is sent to the target receiving terminal device, the receiving terminal device that receives it divides the information of this unit into data and transmission time information and reproduces it, and the longest transmission time among them is the longest transmission time. It is stored in the storage means. The difference calculation means obtains the difference between the stored longest transmission time and each transmission time obtained by the separating means, and the processing delay means causes the data processing means to reproduce the data reproduced by the information separating means for each obtained difference time. Delay processing start time.

As a result, the data processing in the receiving terminal device is controlled so as to be processed according to the order sent by the sending terminal device, not the order of the data sent to the receiving terminal device. That is, it is possible to process the data in the receiving terminal device in the correct order without being affected by the variation in the transmission delay occurring on the communication network.

(3) One from a plurality of transmission terminal devices
A first step of measuring a transmission time required to transmit data from the transmitting terminal device to the receiving terminal device in a method for synchronizing media when transmitting data to one receiving terminal device via a communication network; A second step of transmitting the transmission time together with the data from the transmitting terminal device to the receiving terminal device; a third step of storing the longest time of the transmitting time sent to the receiving terminal device; A fourth step of obtaining a difference between the longest time stored in step 3 and each of the transmission times, and each processing start time of the data in the receiving terminal device is delayed by the difference time obtained in the fourth step. An inter-media synchronization method comprising: a fifth step. (Corresponding to the second modification of the first embodiment).

(Operation and Effect 3) Measured in the first step,
The transmission time required for data transmission between the transmitting and receiving terminal devices is transmitted to the target receiving terminal device together with the data in the second step, and the longest time is stored in the third step. The difference between the stored maximum time and each transmission time is obtained in the fourth step, and in the fifth step, the processing start time of the data in the receiving terminal device is delayed by this difference time.

Therefore, the processing of the data in the receiving terminal device is controlled so as to be processed according to the order sent by the application of each sending terminal device, not the order of the data sent to the receiving terminal device. That is, it is possible to process the data in the receiving terminal device in the correct order without being affected by the variation in the transmission delay occurring on the communication network.

(4) The time measuring means sends a call request to the receiving terminal device for transmitting reference clock generating means for generating a predetermined reference clock and the number of clocks generated by the transmitting reference clock generating means. Transmission side counting means for counting at least from the time of transmission to the time when a corresponding response is returned from the receiving terminal device,
And ½ of the number of reference clocks counted by the transmitting side counting means is obtained as a transmission time required to transmit data from the transmitting terminal device to the receiving terminal device (1) or The inter-media synchronization system according to (2). (Corresponding to the first embodiment and the second modification of the first embodiment).

(5) The processing delay means includes a receiving side reference clock generating means for generating a reference clock having the same frequency as the reference clock of the time measuring means, and the reference generated by the receiving side reference clock generating means. And a receiving side counting means for counting clocks, wherein the difference computing means obtains the longest transmission time represented by the reference clock number stored in the longest transmission time storage means and the information separating means. The difference between the reference clock number and the transmission time expressed by the reference clock number is obtained, and the information separating means obtains the clock number of the obtained reference clock number difference only while the receiving side counting means counts it. The inter-media synchronization system according to (1) or (2), characterized in that the processing start time of the data processing means for the data is delayed. Stem. (Corresponding to the first embodiment).

(6) The transmitting side counting means initializes its counter value (that is, clears to zero) when issuing a call request to the receiving terminal device, and the response of the call request is returned from the receiving terminal device. Transmission time expressed by the reference clock number required for data transmission from the transmission terminal device to the reception terminal device, which is 1/2 of the count-up number of the (measured reception side counter means) (4) The inter-media synchronization system described in (4). (Corresponding to the first embodiment and the second modification of the first embodiment).

(7) The communication network is an ATM
(Asynchronous Transfer Mode) The inter-media synchronization system according to (1) or (2) or (4) or (5) or (6), which is an exchange network. (Compatible with all embodiments).

(Operation and Effect 7) When one communication path is secured between the transmission terminal device and the reception terminal device,
Since the information is transmitted using this route VC after that, the transmission delay time can be treated as constant.

(8) Digit number comparing means for comparing the count digit numbers of the receiving side counting means and the transmitting side counting means, and a digit number for storing the minimum digit number obtained as a result of comparison by the digit number comparing means. The storage means and the reception side counting means or the transmission side counting means having a number of digits larger than the number of digits stored in the digit number storage means counts up to the number of digits stored in the digit number storage means. (1), which further comprises a digit number control unit for controlling so as to perform (1),
(2), The inter-media synchronization system according to any one of (4) to (7). (Corresponding to the second embodiment).

(9) One from a plurality of transmission terminal devices
In an inter-media synchronization system for transmitting data to one receiving terminal device via a communication network while synchronizing, a reference clock of the same frequency is generated in each of the plurality of transmitting terminal devices and the receiving terminal device. The transmitting terminal device includes a reference clock generating means, a clock counting means for counting the clocks generated by the reference clock generating means, and a count value synchronizing means for making the count values of the respective clock counting means the same value. Has information sending means for sending the data and the count value indicated by the clock counting means as one unit of information to the receiving terminal device, and the information is sent to the receiving terminal device from the information sending means. Information separation that divides the information of one unit into the data and the count value indicated by the clock counting means A step, information storage means for storing the data of each of the transmission terminal devices that has been unprocessed by the data processing means obtained by the information separating means, and unprocessed by the data processing means obtained by the information separating means. The processing waiting count value storage means for storing the count value indicated by the clock counting means for each of the transmission terminal devices corresponding to the data, and the clock counting means corresponding to the data processed by the data processing means are shown. The processed count value storage means for storing the count value and the minimum count value of the count values finally stored in each of the process wait count value storage means for processing are extracted, and the extracted process wait minimum meter is extracted. A numerical value is compared with a count value stored in the processed count value storage means, and if the minimum count value waiting for processing is larger, the count value is changed to the corresponding count value. The corresponding data and the data corresponding to the count value initially stored in the other processing count value storage means are read from the information storage means, processed by the data processing means, and subjected to predetermined processing. When the count value corresponding to the data is deleted from the processing wait count value storage means, and the count value is stored in the processed count value storage means, and the processing wait count minimum count value is smaller or equal to Has an output discard control means for erasing the data corresponding to the processing waiting minimum count value from the information storage means and erasing the processing waiting minimum count value from the processing waiting count value storage means. (1), (2), (4) ~ characterized by
The inter-media synchronization system according to any one of (8).
(Corresponding to the third embodiment).

(Operation and Effect 9) The count value synchronizing means sets the reference clock generated by the reference clock generating means to the same value as the value counted by the clock counting means. When the information sending means of the sending terminal sends the data and the count value to the target receiving terminal in a predetermined transmission unit, the information separating means of the receiving terminal which receives the data reproduces the information by dividing it into the data and the count value. The obtained data for each unprocessed transmission terminal is stored in the information storage means. Also,
The count value indicated by the clock counting means for each transmission terminal corresponding to the data not processed by the data processing means is stored in the count value storage means. The count value indicating the clock counting means corresponding to the data processed by the data processing means is stored in the processed count value storage means, and the minimum count value among the count values stored last is extracted from this count value. The extracted minimum waiting count value and the processed count value are compared.
In this comparison, when the minimum waiting count value for processing is larger, the data corresponding to the count value and the data corresponding to the count value first stored in the other waiting count value storage means are stored in the information storage means. The read count value is processed by the data processing means, the count value corresponding to the data subjected to the predetermined processing is erased from the processing count value storage means, and the count value is stored in the processed count value storage means. It

On the other hand, when the processing waiting minimum count value is smaller than or equal to the processing waiting minimum count value, the discard control means erases the data corresponding to the processing waiting minimum count value from the information storing means and the processing wait minimum count value. The numerical value itself is also erased from the processing count value storage means. That is, when (data in the processing waiting counter value holding unit)> (data in the processed counter value holding unit), “output is permitted”, while (data in the processing waiting counter value holding unit) ≦ (processing In the case of the completed counter value holding unit), the data in the memory having the smallest counter value is “discarded” and the other data is held in this memory without “output permission”.

As a result, the data sent after the "call request" is processed in the order in which the application sends it out, not in the order in which the data was sent to the receiving terminal device, and there is a contradiction at the initial stage. Without doing so, the receiving terminal device side can perform data processing in time series without being affected by the difference in transmission delay on the communication network between the plurality of transmitting terminal devices.

(10) At least one of the information storage means and the processing waiting count value storage means is a FIFO (First In First Out) memory, and the inter-media according to (9) Synchronization system.
(Corresponding to the third embodiment).

(Function and Effect 10) Since the FIFO memory is read in order from the first stored memory, it is suitable as a storage means constituting the present invention.

(11) The reference clock generating means is
A system clock generating means for generating a clock having a frequency different from that of the reference clock, and a count-up period generating means for generating the reference clock using the clock (1), (2) ,
The inter-media synchronization system according to any one of (4) to (9). (Corresponding to the first to third embodiments).

(12) In the inter-media synchronization system for transmitting data from a plurality of transmitting terminal devices to one receiving terminal device while synchronizing with each other via a communication network, a call is made from the transmitting terminal device to the receiving terminal device. When the receiving terminal device returns a response to the request to the transmitting terminal device, a sixth step of returning the count value indicated by the clock counting means in the receiving terminal device together, and the receiving step from the transmitting terminal device. Seventh step of measuring the transmission time required to transmit data to the terminal device by the clock counting means in the transmission terminal device, and 1 / of the transmission time required to transmit the data obtained in the seventh step. And the count value returned to the transmitting terminal device in the sixth step. And a ninth step of setting the count value of the addition result obtained in the eighth step to the count value indicated by the clock counting means in the receiving terminal device. Characteristic method of synchronization between media. (Corresponding to the first embodiment or the third embodiment).

(Operation and Effect 12) In the sixth step, when the receiving terminal sends back a response to the call request from the transmitting terminal to the receiving terminal,
The count value indicated by the clock counting means in the receiving terminal is returned. In the seventh step, the transmission time required for data transmission is measured by the clock counting means in the transmission terminal. 8th
In the process, a count value corresponding to 1/2 of the transmission time,
In the sixth step, the count value returned to the transmitting terminal is added, and in the ninth step, the count value of the obtained addition result is used as the count value indicated by the clock counting means in the receiving terminal.

As a result, the processing of the data after the call request is delivered to the receiving terminal device is processed not according to the order of the data sent to the receiving terminal device but according to the order sent by the sending terminal device application. Therefore, in particular, if this inter-media synchronization function is used in a large number of transmission terminal devices, the desired data processing can be performed in the correct order on the reception terminal device side without being substantially affected by the transmission delay occurring on the communication network. It can be carried out.

(13) ATM (Asynchronous Transfer)
Mode) A method of synchronizing media between a plurality of transmitting terminal devices and one receiving terminal device, which are mutually connected via a line, wherein the transmitting terminal device sets a time stamp for adding a time stamp to data. Section, a synchronization control section for outputting data sent from the transmission terminal apparatus to each application in the reception terminal apparatus in synchronization with each other, and in the reception terminal apparatus, mutually connected with the synchronization control section. And is mutually connected to the time stamp setting unit in the transmitting terminal device,
The data packet assembling / disassembling processing control unit and the data packet assembling / disassembling processing control unit are connected to each other, and AAL (ATM Adu) which performs predetermined conversion of user data and ATM cells.
ption layer) processing unit and the AAL processing unit, and the ATM cell processing unit for transmitting and receiving the ATM cells, and the ATM cell processing unit, and the AT
An ATM physical layer processing unit for converting M cells and electric signals and transmitting / receiving to / from an ATM network. (Corresponding to the first to third embodiments).

(Operation and Effect 13) Transmission terminal device A
Made a "call request", and as a time stamp,
The receiving terminal device acquires the counter value that is cyclically counted in response to the passage of time, sets the value including the delay due to the transmission time of communication in (Counter) of its own terminal, and transmits each The same counter value is used in the terminal devices A and B and the receiving terminal. Furthermore, by adding this counter value to (packet) data and transmitting it, the maximum delay time required for communication between each transmitting / receiving terminal device can be calculated, and it is transmitted from the transmitting terminal device A side or B side. Delay processing of all data by the maximum delay time.

As a result, the processing of the data after the call request is delivered is not in the order of the data sent to the receiving terminal device, but in the order sent by the application of the sending terminal device A or B. In particular, a large number of transmitting terminal devices A, B,
When such inter-media synchronization function is used, desired data processing can be performed in the correct order on the receiving terminal device side without being affected by transmission delay occurring on the communication network.

(14) The time stamp setting unit
A count-up cycle creating unit that creates a count-up cycle of a frequency common to all terminal devices using the system clocks that the transmitting terminal devices have, and a count created by each of the count-up cycle creating units. The synchronization control unit uses the system clock of the receiving terminal device to create a count-up period of a frequency common to all the transmitting terminal devices and the receiving terminal devices. A count-up period creation unit, a counter that increments (adds) in the count-up period created by the count-up period creation unit, and a delay storage unit that stores the transmission delay (time) of the transmission terminal device and the reception terminal device. When A maximum delay storage unit that stores the maximum transmission delay of the transmission terminal device and the reception terminal device, and is connected to the delay storage unit and the maximum delay storage unit, and based on the data of the delay storage unit and the maximum delay storage unit. The inter-media synchronization system according to (13), further comprising: a delay processing unit that controls output. (Corresponding to the first or second embodiment).

(15) The time stamp setting unit
A count-up cycle creating section for creating a count-up cycle of a frequency common to all terminal apparatuses by the transmitting terminal apparatus using each system clock, and a count-up cycle created by each count-up cycle creating section. And a counter that increments at a time, wherein the synchronization control unit uses the system clock of the receiving terminal device to create a count-up cycle of a frequency common to all the transmitting terminal devices and the receiving terminal device. A cycle creating section, a counter for incrementing the count up cycle created by the count up cycle creating section, and a comparing section for judging whether the data is sent earlier in the transmitting terminal device than the already processed data. , The comparison Characterized by based on the results and an output discard control unit for controlling the output (13)
The inter-media synchronization system described in. (This configuration corresponds to the third embodiment of FIGS. 3 and 4).

(Operation and Effect 15) When the transmission terminal device makes a call request, the counter value on the reception terminal device side is acquired, and a value including the communication delay is set in its own counter and transmission / reception is performed. Use the same counter value between receiving terminal devices. Further, by adding this counter value to the data and transmitting the data, the receiving terminal device side can understand at which timing each transmitting terminal device transmitted data, and the data can be transmitted before the already processed data. If the data is sent out, discard it before the data is passed to the application.

As a result, the data sent after the "call request" is processed in the order in which the application sends it out, not in the order in which the data is sent to the receiving terminal device. Thus, the receiving terminal device side can perform data processing in time series without being affected by the difference in transmission delay on the network.

(16) A storage means for storing the data transmission time measured by the time measuring means, and a "disconnection request" for disconnecting the data transmission to the reception terminal device from one of the transmission terminal devices. Storage control means for substantially erasing the data transmission time corresponding to one of the transmission terminal devices from the storage means when the storage terminal device is operated.
The inter-media synchronization system according to (1), wherein the storage control unit detects the longest time of the remaining data transmission time stored in the storage unit after the erasing operation. . (Corresponding to the fourth embodiment (FIG. 6)).

(17) The receiving terminal device disconnects information transmission from one of the transmitting terminal device and the transmitting terminal device, which stores the transmitting time obtained by the information separating device, to the receiving terminal device. "Disconnect request"
Storage control means for substantially erasing the transmission time corresponding to one of the transmission terminal devices from the transmission time storage means when the transmission is issued. After the erase operation of the time storage means,
The inter-media synchronization system according to (2), wherein the longest transmission time of the remaining transmission times stored in the transmission time storage means is stored. (Corresponding to the fourth embodiment (FIG. 6)).

(18) A sixth step in which the receiving terminal device receives a "disconnect request" for disconnecting data transmission to the receiving terminal device sent from one of the transmitting terminal devices, and the process is sent to the receiving terminal device. A seventh step of storing a maximum transmission time obtained by excluding one transmission time of the transmission terminal device that has issued the disconnection request in the sixth step, and the seventh step; Eighth step of obtaining a difference between the longest time stored in step 7 and each transmission time other than one transmission time of the transmitting terminal device, and reception of the data for each difference time obtained in the eighth step The inter-media synchronization method according to (3), further including a ninth step of delaying each processing start time that can be placed in the terminal device. (Corresponding to the fourth embodiment).

(Effects 16 to 18) When the transmitting terminal device makes a call request, the counter value on the receiving terminal device side is acquired, and a value including the communication delay is set in its own counter, Use the same counter value on the transmitting and receiving terminal equipment. Furthermore, by adding this counter value to the data and transmitting it, it is stored in a delay table that determines the delay required for communication between each transmitting / receiving terminal device. Performs processing to synchronize all incoming data. In addition, when the transmission terminal makes a "disconnection request", it corresponds to the case where the delay amount changes, and a process for synchronizing all the data transmitted from the transmission terminal device side is performed.

As a result, if the data sent from the sending terminal device is data that has not been sent to the application on the receiving terminal device side, synchronization with the data sent from another sending terminal device at the same timing is performed. Therefore, it is possible to perform data processing on the receiving terminal device side in time series without being affected by the difference in transmission delay on the network between the plurality of transmitting terminal devices.

(19) The transmitting terminal device has a counter value discriminating control means for monitoring whether or not the same value is generated in the count value of the transmitting side counting means when the data is transmitted to the receiving terminal device. Further comprising: information generating means for generating predetermined information indicating that the same value has occurred when the same value has occurred, wherein the information transmitting means indicates that the same value has occurred. The inter-media synchronization system according to (4), wherein information is sent to the receiving terminal device together with the data.
(Corresponding to the fifth embodiment (FIG. 9)).

(Operation and Effect 19) The counter value on the receiving terminal device side is acquired, and a value including the communication delay is set in its own counter, and the same counter value is used between the transmitting and receiving terminal devices. When the counter value is added to the data and transmitted, it is determined whether or not the counter value is the same as the previous data, and if it is the same, the "subcounter value" is also added and transmitted. Even if the data sent from the sending terminal device has the same counter value as the counter value of the previous sending data, it can be used to synchronize with the data sent from another sending terminal device at the same timing. .

(20) In an inter-media synchronization system for transmitting data from a plurality of transmitting terminal devices to one receiving terminal device while synchronizing with each other via a communication network, at least two transmitting terminals among the plurality of transmitting terminal devices. Time measuring means for measuring the data transmission time required for data transmission from each of the devices to the receiving terminal device, and longest data transmission time detecting means for detecting the longest time of the measured at least two data transmission times. , A difference detecting means for obtaining a difference between the longest data transmission time and one of the measured data transmission times, and the reception terminal device corresponding to one of the data transmission times used for the difference detection. The start of the data processing in the transmission terminal device of the data, the difference detection procedure And a processing delay means for delaying the difference time obtained by the step. (Corresponds to the sixth embodiment (FIG. 10) and is similar to 1.).

(21) In an inter-media synchronization system for transmitting data from a plurality of transmitting terminal devices to one receiving terminal device via a communication network while synchronizing with each other, each of the transmitting terminal devices comprises:
Time measuring means for measuring the passage of time, transmission time storing means for storing the transmission time required for transmitting data from the transmitting terminal device to the receiving terminal device measured by the time measuring means, the data and the transmission Information sending means for sending time to the receiving terminal device as one unit of information, the receiving terminal device comprising:
Information separating means for dividing the one unit of information sent from the information sending means into data and transmission time information, and a longest transmission time for storing the longest transmission time of the transmission times obtained by the information separating means. Storage means, difference calculation means for obtaining a difference between the longest transmission time stored in the longest transmission time storage means and each transmission time obtained by the information separating means, and processing the data obtained by the information separating means And a processing delay means for delaying a transmission start time of the data transmitted from the information transmission means by each difference time calculated by the difference calculation means. (It corresponds to the sixth embodiment and is similar to 2).

(22) In the inter-media synchronization method for transmitting data from a plurality of transmitting terminal devices to one receiving terminal device via a communication network, the transmission of data from the transmitting terminal device to the receiving terminal device is performed. A first step of measuring a required transmission time, a second step of transmitting the transmission time together with the data from the transmitting terminal device to the receiving terminal device, and a transmission time of the transmitting time sent from the transmitting terminal device. A third step of storing the longest time among them, a fourth step of obtaining a difference between the longest time stored in the third step and each transmission time, and each difference time obtained in the fourth step And a fifth step of delaying the transmission time and the transmission start time of the data performed in the second step only. How to synchronize media. (It corresponds to the sixth embodiment and is similar to 3).

(Effects 20 to 22) When each transmission terminal device makes a call request, the communication delay is obtained by its own counter, and this delay amount is added to the transmission data next to the call request and transmitted. . The receiving terminal device refers to this delay amount and requests each transmitting terminal device to perform a delaying process, thereby performing a process of synchronizing all the data transmitted from the transmitting terminal device side. By performing delay processing on the transmitting terminal device side, the configuration of the receiving terminal device itself becomes simple, and is not affected by the difference in transmission delay on the network between a plurality of transmitting terminal devices,
Data processing can be performed on the receiving terminal device side in chronological order.

(23) It is characterized in that it has correction control means for adjusting the count value of the transmission side count means of the transmission terminal device to the count value of the reception side count means of the reception terminal device every predetermined time (5). Inter-media synchronization system described in). (Corresponding to the seventh embodiment (FIG. 11)).

(Operation and Effect 23) The value counted on the transmitting side and the value counted on the receiving side are combined by correcting the counter value on the transmitting terminal apparatus side at a certain timing. This correction enables strict synchronization between media.

[0274]

As described above, in the present invention,
The data processing in the receiving side terminal device is controlled so as to be processed not according to the order of the data sent to the receiving side terminal device but in the order sent out by the application of each sending side terminal device. In other words, data processing can be performed in the receiving side terminal device in the correct order without being affected by variations in transmission delay that occur on the communication network.

(Other effects) Further, by obtaining the counter value of the terminal device on the receiving side and setting the value in the counter of the terminal device on the transmitting side in a form including the transmission delay, the application on the terminal device on the transmitting side can be In the order of transmission, the application of the receiving terminal device can process and synchronize the media.

When a plurality of transmitting terminal devices and receiving terminal devices are transmitting data in synchronization with each other, and when communication with a certain transmitting terminal device is completed, the data for which delay processing is no longer necessary is performed. When it occurs, it is immediately transmitted to the application while keeping the synchronization, and there is an effect that it becomes unnecessary to save unnecessary data.

Even if the transmitting terminal device does not add the counter value to all the data, the transmitting terminal device performs the delay process by adding the delay amount only to the first data after the call request. Further, there is an effect that media can be synchronized even if there are a plurality of transmission terminal devices.

Further, since the receiving terminal device side corrects the counter on the transmitting terminal device side every certain time, there is an effect that it becomes possible to achieve more strict synchronization between media.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an inter-media synchronization system according to a first embodiment.

FIG. 2 is an explanatory diagram related to the operation of the device according to the first embodiment.

FIG. 3 is a block diagram of an inter-media synchronization system according to a third embodiment.

FIG. 4 is an explanatory diagram related to the operation of the device according to the third embodiment.

FIG. 5 is a block diagram of an inter-media synchronization system according to a second embodiment.

FIG. 6 is a block diagram of an inter-media synchronization system according to a fourth embodiment.

FIG. 7 is an explanatory diagram related to the operation of the apparatus according to the fourth embodiment.

FIG. 8 is an explanatory diagram related to the operation of the apparatus according to the fourth embodiment.

FIG. 9 is a block diagram of an inter-media synchronization system according to a fifth embodiment.

FIG. 10 is a block diagram of an inter-media synchronization system according to a sixth embodiment.

FIG. 11 is a block diagram of an inter-media synchronization system according to a seventh embodiment.

FIG. 12 is an explanatory diagram related to the operation of the apparatus according to the seventh embodiment.

[Explanation of symbols]

1000,5000 ... ATM switching network, 1100, 5100 ... Transmission terminal equipment A, 1200, 5200 ... Transmission terminal equipment B, 1300, 3300, 5300 ... Reception terminal equipment, 1150, 1250, 1350, 5150, 5250, 5350 ... System clock , 1151,1251,1351,5151,5251,5351… Count up cycle creation unit, 1101,1201,1301A, 1301B, 5101,5201,5301A, 5301B… Application, 1102,1202,1302A, 1302B, 3302A, 3302B, 5102 , 5202,5302A,
5302B ... Data packet assembly / disassembly processing control unit, 1103,1203,1303,5103,5203,5303 ... Counter, 1105,1205,1305,5105,5205,5305 ... AAL processing control unit, 1106,1206,1306,5106, 5206, 5306 ... ATM cell processing unit, 1107, 1207, 1307, 5107, 5207, 5307 ... ATM physical layer processing unit, 1308A, 1308B, 5308A, 5308B ... Delay storage unit, 1309A, 1309B, 5309A, 5309B ... Delay processing unit , 1310, 5310 ... maximum delay storage section, 1104, 1204 ... memory, 3304A, 3304B ... FIFO memory, 3308 ... comparator, 3309 ... processed counter value holding section, 5104,5204 ... counter reset section, 5304 ... counter comparison control Department. 1110,1210,1310 ... Counter value discrimination control unit, 1120,1220,1320 ... Delay processing unit (transmission side), 1408 ... Delay table, 1409A, 1409B, 1409C ... Delay processing unit (reception side), 1420 ... Response control unit , 1431 ... Correction control unit.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location H04Q 3/00 9466-5K H04L 11/20 102A

Claims (3)

[Claims] 1. An inter-media synchronization system for transmitting data from a plurality of transmitting terminal devices to one receiving terminal device while synchronizing with each other via a communication network, wherein at least two transmitting terminal devices among the plurality of transmitting terminal devices are provided. A time measuring means for measuring a data transmission time required for data transmission from each of the above to the receiving terminal device, and a longest data transmission time detecting means for detecting a longest time of the at least two measured data transmission times. A difference detecting means for obtaining a difference between the longest data transmission time and one of the measured data transmission times; and a transmission terminal device corresponding to one of the data transmission times used for the difference detection. Start of data processing in the receiving terminal device of data, the difference detection Intermedia synchronization system characterized in that it has a processing delay means for delaying the difference time obtained in stage a. 2. An inter-media synchronization system for transmitting data from a plurality of transmitting terminal devices to one receiving terminal device via a communication network while synchronizing with each other, wherein each of the transmitting terminal devices measures elapsed time. Time measurement means, transmission time storage means for storing the transmission time required for data transmission from the transmission terminal device to the reception terminal device measured by the time measurement means, a data part of the data and the transmission time An information sending unit for sending the generated time stamp portion as one unit of information to the receiving terminal device, wherein the receiving terminal device sends the one unit of information sent from the information sending unit to the data. Part and the time stamp part, the information separating means, and the information obtained by the information separating means. Longest transmission time storage means for storing the longest transmission time among the sending times, and difference calculation means for obtaining a difference between the longest transmission time stored in the longest transmission time storage means and each transmission time obtained by the separating means. A data processing means for processing the data obtained by the information separating means, and a processing start time in the data processing means of the data obtained by the information separating means for each difference time obtained by the difference calculating means. An inter-media synchronization system comprising: a processing delay means for delaying. 3. A method of synchronizing media when transmitting data from a plurality of transmitting terminal devices to one receiving terminal device via a communication network, wherein a transmission time required for transmitting data from the transmitting terminal device to the receiving terminal device. And a second step of transmitting the transmission time together with the data from the transmitting terminal device to the receiving terminal device, and storing the longest time of the transmitting time sent to the receiving terminal device. And a fourth step of obtaining the difference between the longest time stored in the third step and each transmission time, and the reception of the data for each difference time obtained in the fourth step. A fifth step of delaying each processing start time in the terminal device, and an inter-media synchronization method.