JPS6147038B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a simultaneous voice communication and data communication service system.

By adding a data line network for data communication to the telephone line network for voice communication, we have created a so-called Multi-Service network that allows simultaneous voice and data communication.
Communication systems are being put into practical use. In order to realize this system, conventionally,
Since voice and data signals are different, a method has been adopted in which a voice network and a data network are provided separately. However, providing separate networks for voice and data is clearly disadvantageous from the economic point of view of the system, and there is a need to improve this. As a method for improving this, the use of synchronized multiplexing technology has already been proposed, and has made it possible to significantly improve the above-mentioned disadvantages. However, in systems using this multiplexing technology, consecutive frames are sent to one subscriber line and those frames are allocated for voice and data, so Since voice information or data information cannot be carried in the frame, there is a problem in that the utilization efficiency of subscriber lines and, by extension, the utilization efficiency of the entire system deteriorates.

In this case, a packet communication method that can transmit the necessary information when necessary becomes an extremely effective method.

Therefore, it is an object of the present invention to propose a simultaneous voice and data communication service system based on the bucket communication system, which can further improve the utilization efficiency of subscriber lines and systems.

In accordance with the above object, the present invention includes a large number of subscriber terminals and a communication sensor device that performs connection exchange between the subscriber terminals via a digital subscriber line, and which connects one of the subscriber terminals to another. In a simultaneous voice communication/data communication service system in which voice information and data information can be selectively transmitted to subscriber terminals using a packet communication method, the digitized voice information is divided into blocks according to predetermined bit lengths. , assigning an audio sequence number to each block and converting it into a bucket, while when transmitting data information, erase the audio information of the arbitrarily selected block, and transmit the data information on the block; The subscriber terminal on the receiving side processes the audio information block and data information separately, and also inserts a block corresponding to the audio sequence number that is missing due to the transmission of the data information, and processes the audio information in the order of the audio sequence number. This is characterized in that information is reproduced.

The present invention will be explained below with reference to the drawings.

FIG. 1 is a block diagram showing an example of the configuration of a simultaneous voice communication/data communication service system to which the present invention is applied. In this figure, 11-1, 11-
2, 11-3, 11-4, . . . are subscriber terminals connected to digital subscriber lines 12-1, 12, respectively.
-2, 12-3, 12-4, . . . are connected to the communication center device 13. Communication center device 1
3 is a large number of subscriber terminals 11-1, 11-2,...
The packets of... are exchanged. Further, the communication center device 13 can be connected to a central processing unit (CPU) 14, so that higher quality services can be provided. In addition, the connection between the communication center device 13 and each digital subscriber line 12-1, 12-2, ...
Connection with the CPU 14 is made via a transmission control section, but is not shown.

The simultaneous voice communication/data communication service system 10 (FIG. 1) of the present invention allows various types of communication, and therefore the subscriber terminal 11 used in this system
-1, 11-2, . . . (FIG. 1) each has a configuration as shown in FIG. 2, for example. FIG. 2 is a perspective view showing an example of an arbitrary subscriber terminal,
In this figure, 21 is a handset used for normal voice communication, 22 is a pushbutton for dialing and other data input, 23 is a facsimile, a teletypewriter, a panel display, etc.
Function keys for selecting functions such as CRT display, 24 is panel display section, 25
are optional devices such as CRTs, fax machines, and teletypewriters.

In the present invention, the system 10 shown in FIG. 1 uses a packet communication method. As is well known, in this packet communication system, information is transmitted and received with each packet, and the packet generally has a format as shown in FIG. In this figure, F _s is a flag indicating the beginning of the packet, A is a control information section that displays the address of the sender and receiver, as well as necessary commands, etc., and I is an information section that carries information to be transmitted. Department, F _e
is a flag indicating the end of the packet. In addition,
CRC check bits and the like are also added, but are not shown. When performing voice communication or data communication, voice information or data information is loaded onto the information section I.

In order to enable these simultaneous services by selectively carrying voice information or data information on the packet, the present invention introduces a priority display area within the packet format. This priority is given to both voice information and data information, and when both of them compete to occupy a digital subscriber line, information with a higher priority is transmitted preferentially. How this priority is assigned to each packet will be explained.

First, let's talk about voice information, which has an overwhelmingly large amount of information. When digitized audio information is packetized and transmitted, the audio information is divided into predetermined bit lengths and uniformly converted into blocks. It is assumed that an audio packet is formed with each block as one unit. Data information is also divided into blocks of predetermined bit length to form data packets. When both exist in competition, one of them is given priority according to the above-mentioned priority. Here, an important condition imposed on voice information is that it must not lose the immediacy of conversation. If this immediacy is lost, the conversation becomes extremely unnatural.
However, if this immediacy is strictly maintained, a problem arises in that even if there is a request to send data to be transmitted at the same time during a conversation, the request must be put on hold until the end of the conversation. In other words, if high priority is given to all voice blocks of a conversation, the conversation will not be unnatural, but data blocks will not be able to be transmitted. Therefore, it is necessary to give priority to voice blocks according to some criteria, so that data blocks can also be transmitted as appropriate. Various methods can be considered for assigning high and low priorities, but the most appropriate method is to detect idle speech blocks such as syllable breaks during conversation, sentence breaks, and opening up the other party's conversation, and to A low priority is given, and if there is a request to transmit data information, a data block will be transmitted instead of a voice block.

However, since the audio that should originally exist is erased due to the data, there is a risk that the reproduced audio will be slightly unnatural at the subscriber terminal on the receiving side. Therefore, in the present invention, audio sequence numbers are assigned to each audio block in the order of occurrence. On the receiving side, the received packets are sorted into audio blocks and data blocks, and the audio sequence numbers of the audio blocks are also monitored. If there is a missing number in the audio sequence number, the block has already been used as a data block, so the block automatically adds an audio block of idle information (for example, information representing silence) corresponding to the missing number, and creates a continuous audio sequence. Play a group of audio blocks with numbers. Here on the receiving side,
It is possible to open and read audio that is reproduced in a form that is close to normal. The packet of the present invention, which enables such transmission, has a format as shown in FIG. In Fig. 4, the areas labeled F _s , F _e , A, and I are the same as in Fig. 3, and are the same as before, but the difference is that areas D, S, and P are added. . Area D indicates whether the information part I of the packet is an audio block or a data block, area S displays the audio sequence number, and area P indicates the priority. indicate. On the receiving side, first, the head area D is looked at to decide where to allocate the information. If D displays audio information, the subsequent information is distributed to the audio side, while if D displays data information, the subsequent information is distributed to the data side. Furthermore, on the audio side, the area S is monitored to check whether there are any missing audio sequence numbers. If there is a missing number, a predetermined audio block is inserted into the missing number as described above. On the data side, desired data is obtained from the data block, stored in memory, and sequentially processed.

The priority P in the packet format shown in Figure 4 is formed immediately after voice is generated within the subscriber terminal on the sending side. A data block is formed in place of an audio block in anticipation of when the level P becomes low. The audio sequence number is not required when transmitting this data block. Therefore, the format of a packet containing data information is as shown in FIG. 5, which is obtained by removing the audio sequence number area S from the format shown in FIG. A data block can be extended into this deleted area.

The priority P shown in FIGS. 4 and 5 is formed within the transmitting terminal and determines the occupancy order for audio block and data block packets, and once the occupancy is determined. If so, that priority P is no longer needed. However, this is a case where one sending subscriber terminal and one receiving subscriber terminal have a one-to-one correspondence, and in order to provide a higher quality service, the priority P is , is also necessary after the packet has been sent from the transmitting terminal. For example, in FIG. 1, subscriber terminal 11-
Even if subscriber terminal 1 and subscriber terminal 11-2 are in communication, these subscriber terminals can communicate with other subscriber terminals 11-3, 11-4, ... as necessary, and can also communicate with CPU 14. It is clear that the quality of service will improve if communication is possible. In this case, other subscriber terminals 11-3, 11-4,...
The data information from ... or the data information from the CPU 14 is the subscriber terminal 11-1, 11-2.
It will be superstitized as an interruption to. For this interrupt as well, if simultaneous service is enabled, the priority P becomes valid again. That is, subscriber terminals 11-1 and 11-
If a voice block with a low priority P appears during communication between the two, it can be erased, an interrupt can be made, and a data block can be loaded. Furthermore, if a data block with a low priority P appears, it can be temporarily held in the CPU 14, for example, and an interrupt data block with a high degree of urgency can be sent to a predetermined subscriber terminal first.

In any case, by assigning high and low priority P, simultaneous voice and data communication services are possible. FIGS. 6 1 and 2 are diagrams showing examples of packet patterns to which the present invention is applied on the transmitting side, and FIGS. 7 1 and 2 are diagrams showing examples of packet patterns to which the present invention is applied on the receiving side. be. In both figures, each block is a simplified representation of the packet shown in FIGS. 4 and 5. Further, P or p of each block indicates a priority, where P indicates a high priority and p indicates a low priority. Further, 1, 2, 3, . . . indicate audio sequence numbers, where audio indicates an audio block and data indicates a data block. In FIG. 6, it is assumed that the packet pattern shown in the upper column is in a state to be transmitted. At that time, it is assumed that a request to transmit the data packet 61 shown in the lower column is generated. Therefore, the (p) voice packet 62 having the lower priority among the voice blocks is used for sending out the data packet 61. Therefore, in reality, the packet pattern shown in FIG. 6 will be sent to the digital subscriber line. On the other hand, the receiving side looks at area D shown in FIGS. 4 and 5 and distributes packets to the audio side and the data side. FIG. 7 1 shows this state. However, when looking at the audio side, the audio block corresponding to audio sequence number 3 (packet 62 in Figure 6, 1) is missing, and if the audio is played back as is, the conversation will become somewhat unnatural. There is a risk. Therefore, it is assumed that the receiving side inserts the audio block 71 corresponding to audio sequence number 3 and reproduces audio that is extremely close to the original conversation.

FIG. 8 is a block diagram illustrating the internal structure of the subscriber terminal shown in FIG.
After the audio from 1 is digitized by an encoder/decoder 81, it is given priority by an audio priority circuit 83- in a terminal processing unit (TPU) 82 and stored in an area 84- in a memory 84. It will be stored once. Similarly, facsimile 85, CRT 86, teletypewriter 8 selected by function key
Data such as 7 is also given a priority by the data priority circuit 83- in the TPU 82 and is temporarily stored in the area 84- in the memory 84. The data in the memory 84 is HDLC (High
Digital subscriber line 12 organized in packet format in Level Data Link Circuit) 88
sent to. In this case, when the HDLC 88 organizes the packet format, the memory 84-
When a predetermined amount or more of data information is accumulated in the block, the priority P of the voice information is detected, and the low priority voice block is replaced with a data block. Note that the audio priority circuit 83-
can be configured as a discrimination circuit that discriminates the magnitude of the audio level, and can also be configured as a data priority circuit 83.
-, the data priority may be determined manually, or a high priority may be automatically determined for information from the CRT 86 or the like that requires immediacy. In this figure, 89 is a data bus;
0 represents a keyboard such as a push button 22 (FIG. 2) and a function key 23 (FIG. 2), and 91 is an adapter circuit thereof. CLK is a clock pulse generator.

Although the above description concerns the configuration at the time of transmission, the configuration at the time of reception is also similar, and is separated into audio packets and data packets within the HDLC 88, and temporarily stored in the memories 84- and 84-, respectively. When the HDLC 88 finds that there is a missing number in the audio sequence number of the audio packet, the pseudo data generator 92 outputs silent data, allocates it to the audio block with the missing number, and stores it in the memory 84-. The digital data from the memory 84- is demodulated by the encoder/decoder 81 and reproduced into audio. Memory 84-
Digital data from
5. Sent to CRT 86, teletypewriter 87, etc.

As shown above, the pit rate is, for example, 64Kbit/s.
For extremely high voice information such as ec, some of it is
For example, data information with a low bit rate of 200 to 9,600 bit/sec is appropriately allocated according to priority, allowing simultaneous voice and data communication services. The total length of the packet shown in FIGS. 4 and 5 is, for example, 64 bytes, and the information portion thereof is approximately 60 bytes.

As explained above, according to the present invention, audio that is originally not allowed to be disconnected is appropriately erased by giving priority, and this is replaced with data transmission, and the erased audio has an audio sequence number. A new simultaneous voice and data communication service system that is reproduced in a pseudo manner is realized by adding the following.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of the configuration of a simultaneous voice communication/data communication service system to which the present invention is applied, FIG. 2 is a perspective view showing an example of one arbitrary subscriber terminal, and FIG. FIG. 4 is a diagram showing the format of a general packet; FIG. 4 is a diagram showing the format of a packet containing voice information among the packets based on the present invention; FIG. 5 is a diagram showing the format of a packet containing data information among the packets based on the present invention. Figures 6 1 and 2 are diagrams showing an example of a packet pattern to which the present invention is applied on the transmitting side, and Figures 7 1 and 2 are diagrams showing an example of a packet pattern to which the present invention is applied on the receiving side. FIG. 8 is a block diagram schematically illustrating the internal structure of the subscriber terminal shown in FIG. In the figure, 11-1, 11-2, 11-3,
11-4, ... are subscriber terminals, 12-1, 12-
2, 12-3, 12-4, . . . are digital subscriber lines, 13 is a communication center device, 14 is a central processing unit, 81 is an encoder/decoder, 82 is a terminal processing unit, and 83- is a voice priority 83 is a data priority circuit, 84 is a memory, 88 is an HDLC, 92 is a pseudo data generator, D is an audio/data identification display section, S is an audio sequence number display section, P is a priority display section, I is an information section consisting of an audio block or a data block.

Claims (1)

[Scope of Claims] 1. A communication center device that connects and exchanges connections between a large number of subscriber terminals and the subscriber terminals via a digital subscriber line, and can also exchange data with a central processing unit as necessary. A simultaneous voice communication/data communication service system that transmits and receives voice information and data information between a first subscriber terminal and a second subscriber terminal using a packet communication method, wherein the voice information is digitally transmitted. After converting the audio data into blocks, the audio data is divided into blocks of a predetermined bit length, a priority is assigned to each blocked audio block, an audio sequence number is assigned to each audio block according to the order of occurrence, and the audio data is converted into packets. When a request to transmit data information occurs, the voice block with a low priority is deleted, replaced with the data block for transmitting the data information, and transmitted. A simultaneous voice communication/data communication service system characterized in that, upon transmission, a voice or data identification indicator bit is added to each of the packets containing the voice block or the data block. 2. The service system according to claim 1, in which the subscriber terminal on the receiving side distributes audio blocks and data blocks according to identification display bits. 3. Interrupt transmission of data information from the central processing unit or the third subscriber terminal to the first or second subscriber terminal during communication between the first subscriber terminal and the second subscriber terminal. 2. The service system according to claim 1, wherein when a request is received, a low priority audio block is deleted, replaced with a data block based on the data information, and transmitted. 4. Give priority to packets containing data blocks according to the priority of data information,
During communication between a first subscriber terminal and a second subscriber terminal, the central processing unit or the third subscriber terminal requests the first subscriber terminal or the second subscriber terminal to send data information in an interrupt manner. 2. The service method according to claim 1, wherein when a data block with a low priority is temporarily held, a data block with the relevant data information is transmitted in advance.