JPH07170259A - Isdn communication equipment and isdn communication method - Google Patents

Abstract

PURPOSE:To simplify a circuit for multiplexing and to eliminate the need of mounting a complicated procedure such as the communication procedure of BAS or the like by conducting the exchange of information relating to the multiplexing within application data to be multiplexed. CONSTITUTION:An ISDN communication unit 103 is composed of an ISDN interface part 109, a communication controller 108, a sound input part 105 and a sound codec 106 connected to the sound input part 105. Sound data compressed in the sound codec 106 and data transmitted from a communication application S101 and protocol processed in the communication controller 108 are multiplexed and transmitted to the ISDN interface part 109, reception data from it are separated, the compressed sound data are transmitted to the sound codec 106, received application data are transmitted to the communication controller 108 and the sound codec 106 expands the received sound data and transmits them to the sound input part 105. The communication application 101 exchanges a communication rate with a communicating party and sets and changes the communication rate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is designed to multiplex voice data and computer application data for communication.
The present invention relates to an SDN communication device and an ISDN communication method.

[0002]

2. Description of the Related Art As an example of a conventional ISDN communication device and ISDN communication method, an ISDN communication board mounted in an expansion slot of a personal computer will be described.

First, a method for communicating computer data using an ISDN communication board will be described. Personal computer API (FR for ISDN communication control standardized at the Telecom Advanced Utilization Promotion Center)
Since the basic control method is described in the standard document of API-A), the description will be given along with this.

FIG. 6 is a diagram for explaining a conventional communication device. The communication device 601 includes a personal computer OS 602, an application program 603, an application program interface (hereinafter referred to as API) 604,
It is composed of an ISDN-BIOS 605 and a communication board 606, and is connected to an ISDN network 608 via a DSU 607. The part usually called the device driver is API6
04, ISDN-BIOS 605, and communication board 60
6 and the interface function of a personal computer. Also, I
The SDN-BIOS 605 is mounted in the communication board 606, and the device driver is the API 604 and the communication board 6
In some cases, only the interface between 06 and personal computer is installed.

A voice unit (PC
Even when (M codec + handset) is installed, an API function for use as a voice telephone is defined, and calling / calling can be performed using a communication application.

On the other hand, there is a movement to multiplex compressed voice data and computer application data by using ISDN circuit switching to realize an AGC (Audio Graphic Conference) for communicating on one Bch. JTC-of the TTC standard
There is a standard called H221. This is originally used for videophones and the like, and defines how to multiplex audio signals, image data, and computer data, how to determine a communication rate, and the like. Using JT-H221, it is possible to multiplex voice data and computer data.
Since AS / BAS is defined and multiplexing is controlled, the procedure of changing the communication rate between the multiplexing circuit and each other becomes complicated.

FIG. 2 is a block diagram for realizing an AGC system based on the conventional technique. Application data and voice data are multiplexed by the multiplexing / separation unit and IS
Communicated using Bch of DN, separated on the receiving side,
AGC using voice and communication application can be realized. The communication controller 208 is FRAPI-
It has a function of processing a call connection and an in-channel protocol in Bch as described in A. The communication application B201 or ISDN-BIOS 207 uses the control signal 214 to control the communication controller 208, the voice unit 204, and the multiplexing / separating unit 211 to set the communication rate. The multiplexing / separation unit 211 has the function of JT-H221, and executes the synchronization establishment function of FAS and the communication procedure of BAS. Since the communication rate change notification is notified by BAS data, the communication is performed independently of the application data.

[0008]

As described above, in the prior art, the computer communication (FRAPI-A etc.) using the ISDN board and the function of multiplexing voice data and computer application data (JT-H2) are used.
21) are being developed in different categories, and when developing docked AGC products, the circuit for multiplexing and the function to negotiate the communication rate with each other have very redundant specifications. There is a problem that it ends up.

The present invention has been made in view of the above-mentioned circumstances, and simplifies a circuit for multiplexing by executing information exchange relating to multiplexing in application data to be multiplexed, and a BAS communication procedure. It is an object of the present invention to provide an inexpensive AGC system that does not need to implement such a complicated procedure.

[0010]

(1) ISDN of the present invention
The communication device has an ISDN communication unit connected to a computer, a communication application operating on the computer (described as communication application S), and a device driver for controlling the ISDN communication unit and providing communication service to the communication application S. The ISDN communication unit performs ISDN call connection with the ISDN interface unit that interfaces with the DSU of the ISDN network, and performs protocol processing for transferring data transmitted and received from the communication application S in the Bch connected by circuit switching. The audio unit is composed of a communication controller, a voice input / output unit, and a voice codec connected to the voice input / output unit. The voice data compressed by the voice codec and transmitted from the communication application S are transmitted by the communication controller to the protocol controller. The processed data (described as application data) is multiplexed and transmitted to the ISDN interface unit, the reception data from the ISDN interface unit is separated and the compressed voice data is sent to the voice codec, and the received application data is the communication controller. The voice codec has a function of expanding the received voice data and transmitting the voice data to the voice input / output unit, and the communication application S uses the multiplexed application data to communicate with the communication application of the communication partner (described as communication application D). And the communication rate is notified to each other, and the communication application S sets / changes the communication rate by controlling the communication controller and the voice unit through the device driver.

(2) The ISDN communication method of the present invention is
In the ISDN communication device according to (1), a confirmation-type association request / response packet is defined between the communication application S and the communication application D through application data that is multiplexed and communicated,
After connecting the communication line and after changing the communication rate, the association is first established by using the association request / response packet, and then the arbitrary communication using the application data is performed.

(3) The ISDN communication method of the present invention comprises:
ISDN communication device described in (1) or ISD described in (2)
In the N communication method, the communication application S on the side requesting to change the communication rate mutes the voice of the audio unit before transmitting the communication rate change request packet to the communication application D, and the communication rate change response packet is returned. When the communication is received, the communication rate change is set to the ISDN communication unit, and when the association is established, the voice of the voice unit is enabled at the new rate and the communication partner (the side notified of the change in the communication rate).
When the communication application D receives the communication rate change request packet, it mutes the voice of its own voice unit, transmits the communication rate change response packet, and then sets the communication rate change to the own ISDN communication unit. And then enable voice on your local voice unit at the new rate when the association is established,
It is characterized by

[0013]

(Embodiment 1) FIG. 1 shows the ISD of the invention of claim 1.
It is a block diagram which shows one Example of N communication apparatus. IS
The DN communication unit 103 is connected to a computer, and a communication application S101 operating on the computer.
Uses the service of the ISDN communication unit 103 through the device driver 102. Considering in comparison with FRAPI-A, the ISDN communication unit 103 is ISD
It corresponds to the N board, the interface between the communication application 101 and the device driver 102 corresponds to the API, and the ISDN-BIOS 107 is connected to the computer and the ISD.
Interpret the interface function and API of N unit
It controls each function of the SDN communication unit 103.

The communication controller 108 is an ISDN D
It realizes call connection function using ch, in-channel protocol after Bch is connected by circuit switching, HD
Realize functions such as LC. ISDN interface unit 1
Reference numeral 09 is a portion that interfaces with the ISDN network via the DSU 110. Here, ISDN-BIOS107
ISDN is installed in the ISDN communication unit.
There is no problem even if the BIOS main body is mounted in the device driver 102 and the ISDN-BIOS 107 is mounted with only the interface function.

FIG. 3 is a diagram for explaining an embodiment of the multiplexing bus 111.

The multiplexed bus synchronizing signal 301 is a synchronizing signal of 8 kHz. From this synchronizing signal, the multiplexed bus clock 3
02, the multiplexed bus data 303 is defined.
By handling data of 2 bits of Dch data, 8 bits of B1ch data and 8 bits of B2ch data for each multiplexed bus synchronization signal 301, Dch is 16 kbps, B
1ch and B2ch each have a transfer rate of 64 kbps. In the present embodiment, two data buses of the multiplexed bus 111 are prepared for the transmission data and the reception data, and the specifications are for the multiplexed bus data 303 respectively, but there is no problem even if they are realized by one data bus. .

Next, the audio unit 104 will be described.
The voice input / output unit 105 can be realized by a handset, a microphone / speaker, or the like. The audio codec 106 has a function of performing PCM conversion of an analog signal of the audio input / output unit 105, further converting into an analog signal of 32 kbps ADPCM defined by the TTC standard, or digitally converting into a communication rate of 16 kbps, 8 kbps, or the like. There is.

The procedure from the start of communication will be described. First, in response to a call connection request from the communication application S101,
The communication controller 108 uses the Dch data of the multiplexed bus 111 to make a call connection with the ISDN network, and, for example, B1ch is connected with the communication partner by circuit switching (unlimited digital attribute). In this state, the application data is B1c
All 64 kbps of h are used, and voice communication is not possible.

In this state, the communication application S10
1 indicates the communication rate as application data 32 kbp
s, consider a case where a change request is made to voice data 32 kbps.

The communication application S101 transmits a communication rate change request packet as application data to the communication application D as a communication partner, and the communication application D transmits a communication rate change response packet to the communication application S101. Application data 32 kbps and audio data 32 kbps are notified as the parameters of this communication rate change request packet. The communication application S101 changes the communication rate of the ISDN communication unit 103 after receiving the communication change response packet. Specifically, using the control signal 112, the audio codec 106 and the communication controller 108 are
The setting of B1c is changed on the multiplexing bus shown in FIG.
Application data in the first 4 bits of h,
The remaining 4 bits of B1ch handle audio data.

Regarding the value of the communication rate, a value determined by the allocation of 8 bits for each multiplexed bus synchronization signal 301 is preferable, and when the ratio of the communication rate is a multiple of 8 kbps, additional hardware for multiplexing is added. It is clear that is rarely needed. On the other hand, the communication application D of the communication partner changes the communication rate of its own ISDN communication unit after transmitting the communication change response packet. Specifically, the control signal is used to change the settings of the voice codec and communication controller, and on the multiplexed bus,
The first 4 bits of B1ch handle application data, and the remaining 4 bits of B1ch handle audio data.

(Embodiment 2) FIG. 4 shows the IS of the invention of claim 2.
It is a figure for demonstrating one Example of a DN communication method.

Consider a case where the communication application S101 and the communication application D are circuit-switched (non-restricted digital attribute) connected by the ISDN B1ch. In this state, the application data is 64k of B1ch.
Since all bps are used, voice communication is not possible.
Next, consider a case where the communication application S requests the communication rate to be changed to application data 32 kbps and voice data 32 kbps.

A description will be given below with reference to FIG. 4, but since it is a diagram for explaining the procedure, the description of the device driver and the like is omitted.

The communication application S101 is B1ch
A communication rate change request packet is transmitted to the communication application D as a communication partner as application data using, and the communication application D transmits a communication rate change response packet to the communication application S101.

After the communication application S101 receives the communication change response packet, the ISDN communication unit 103
Change the communication rate of. Specifically, the control signal 112
To change the settings of the voice codec 106 and the communication controller 108, and on the multiplex bus shown in FIG.
The first 4 bits of B1ch handle application data, and the remaining 4 bits of B1ch handle audio data.

On the other hand, the communication application D of the communication partner
Sends the communication change response packet, and then
Change the communication rate of the N communication unit.

Then, the communication application S transmits an association request packet in the changed 32 kbps application data and receives an association response packet from the communication application D to know that the communication rate has been changed normally, After that, communication of arbitrary data becomes possible.

The relationship between the communication application S and the communication application D is not the server / client type,
In the peer-to-peer type, if you define a token packet, acquire the token before sending the communication rate change request packet, and release the token after receiving the association response packet, the request collisions on both communication sides will occur. It is avoidable and effective.

Regarding the change of the communication rate, a series of operations as shown in FIG. 4 is performed by the device driver 102 or IS.
It is also possible to implement it by implementing it as the operation of the DN-BIOS 107, and the communication application S may request the device driver 102 or the ISDN-BIOS 107 for a service of changing the communication rate, and the present invention does not limit the implementation. .

Also, the association request / response packet is used for the purpose of confirming that both sides of communication are normally connected. According to the present invention, the conventional JT-H221
As in the standard, complicated multiplexing that establishes FAS synchronization and changes the communication rate at the BAS communication timing
Even if the separation unit 211 is not provided, even if a mismatch occurs due to the change timings not being the same in both the communication at the time of changing the communication rate, invalid data will not be passed to the communication application S as application data.

(Embodiment 3) FIG. 5 shows the IS of the invention of claim 5.
It is a figure for demonstrating one Example of a DN communication method.

The communication application S101 and the communication application D are circuit-switched (unrestricted digital attribute) connection by the ISDN B1ch, and the application data is 32 kbps and the voice data is 32 kbps, and the application data is 48 kbp.
Consider the case where the voice data is changed to 16 kbps.

A description will be given below with reference to FIG. 5, but since it is a diagram for explaining the procedure, the description of the device driver and the like is omitted.

The communication application S101 first issues an audio mute request to the ISDN communication unit. Specifically, by using the control signal 112, the audio codec 106
May be disabled, or the voice input / output unit may be disabled. The purpose is to prevent inconsistent noise from entering when changing the communication rate, and the method is not limited as long as the voice can be muted.

Next, a communication rate change request packet is transmitted as application data to the communication application D, which is the communication partner, and the communication application D mutes its own voice and transmits a communication rate change response packet to the communication application S101. To do.

After the communication application S101 receives the communication change response packet, the ISDN communication unit 103
Change the communication rate of.

On the other hand, the communication application D of the communication partner
Changes the communication rate of its own ISDN communication unit after transmitting the communication rate change response packet.

After that, the communication application S transmits an association request packet in the changed 48 kbps application data and receives an association response packet from the communication application D to know that the communication rate has been changed normally, IS
The voice of the DN communication unit 103 is enabled. After that, communication of arbitrary data becomes possible.

On the other hand, the communication application D of the communication partner
Enables the voice of the local ISDN communication unit after transmitting the association response packet.

The relationship between the communication application S and the communication application D is not the server / client type,
In the peer-to-peer type, if you define a token packet, acquire the token before sending the communication rate change request packet, and release the token after receiving the association response packet, the request collisions on both communication sides will occur. It is avoidable and effective.

Regarding the change of the communication rate, a series of operations as shown in FIG. 5 is performed by the device driver 102 or IS.
It is also possible to implement it by implementing it as the operation of the DN-BIOS 107, and the communication application S may request the device driver 102 or the ISDN-BIOS 107 for a service of changing the communication rate, and the present invention does not limit the implementation. .

Further, since the association request / response packet is used for the purpose of confirming that both sides of communication are normally connected, the type of packet is not limited as long as the same function can be realized.

According to the present invention, unlike the conventional JT-221 standard, even if there is no complicated multiplexing / separating unit 211 for establishing FAS synchronization and changing the communication rate at the communication timing of BAS. Even if a mismatch occurs due to mismatching of the change timings in both communications when changing the communication rate, there will be no noise in the voice data due to the mismatch.

(Embodiment 4) The ISDN communication apparatus according to claim 1 may be an ISDN communication apparatus which implements the ISDN communication method shown in Embodiments 2 to 3.

With respect to this implementation, FIGS. 3 and 4 describe that the communication application S101 requests all procedures such as transmission of a communication rate change request packet, communication rate change instruction, audio mute, and enable. However, the communication application S101 requests a series of services, and each request requires a device driver 102 or ISD.
There is no problem even if it is implemented as a function of N-BIOS 107.

Regarding the setting of the communication rate, it is possible to determine the default rate according to the application. For example, the application type is set as the communication partner by using the parameters of the communication path opening and the outgoing / incoming call. Or the ISDN communication unit to notify the ISDN communication unit that the communication is started at the application data 32 kbps and the voice 32 kbps, the ISDN-BIOS 107 automatically sets the communication rate when the communication connection is established. It is also possible to perform at 104. In such a case, the function of the communication rate change request packet can be omitted. However, the procedure of confirming that the application data can be normally communicated by the association request / response packet and enabling the voice is effective.

[0048]

As described above, according to the present invention, the information exchange relating to the setting / changing of the communication rate is executed in the application data to be multiplexed, thereby simplifying the circuit for multiplexing and fas Synchronization and BAS
This eliminates the need for a multiplexing / separating unit that implements a complicated procedure such as the communication procedure described above, and has the effect of providing an inexpensive AGC system.

Furthermore, by confirming that the application data can be normally communicated by using the association packet immediately after the communication rate is changed, even if a mismatch occurs due to the change timing not being the same in both the communication when the communication rate is changed, It has an effect that unjust data as application data will not be passed to the communication application.

Furthermore, by muting the voice before changing the communication rate and enabling the voice after the communication rate is changed, a mismatch occurs due to the change timings not being the same at both communication when the communication rate is changed. However, there is an effect that there is no possibility that noise will be introduced due to mismatch of voice data.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an ISDN communication device according to the invention of claim 1.

FIG. 2 is a diagram for explaining a conventional communication device.

FIG. 3 is a diagram for explaining a multiplexing bus of the ISDN communication device according to the first aspect of the invention.

FIG. 4 is a diagram for explaining an embodiment of the ISDN communication method according to the invention of claim 2;

FIG. 5 is a diagram for explaining an embodiment of the ISDN communication method according to the invention of claim 3;

FIG. 6 is a diagram for explaining a conventional communication device.

[Explanation of symbols]

 101 Communication Application S 102 Device Driver 103 ISDN Communication Unit 104 Audio Unit 105 Audio Input / Output Unit 106 Audio Codec 107 ISDN-BIOS 108 Communication Controller 109 ISDN Interface Unit 110 DSU 111 Multiplexed Bus 112 Control Signal 201 Communication Application S 202 Device Driver 203 ISDN communication unit 204 Voice unit 205 Voice input / output unit 206 Voice codec 207 ISDN-BIOS 208 Communication controller 209 ISDN interface unit 210 DSU 211 Multiplexing / separating unit 212 Voice data 213 Application data 214 Control signal 301 Multiplexing bus synchronization signal 302 Multiplexing Bus clock 303 Multiplexed bus data 601 Device 602 OS 603 application program 604 API 605 ISDN-BIOS 606 communication board 607 DSU 608 ISDN network

Claims (3)

[Claims] 1. An ISDN communication unit connected to a computer, a communication application running on the computer (described as a communication application S), and the IS.
In an ISDN communication control method having a device driver for controlling a DN communication unit and providing a communication service to the communication application S, the ISDN communication unit connects an ISDN interface unit for interfacing with a DSU of an ISDN network and an ISDN call connection. Bch that has been connected or circuit switched
A communication controller for performing a protocol process for transferring data transmitted and received from the communication application S, a voice input / output unit, and a voice unit including a voice codec connected to the voice input / output unit, The voice data compressed by the voice codec and the data transmitted from the communication application S and subjected to the protocol processing by the communication controller (described as application data) are multiplexed and transmitted to the ISDN interface unit. It has a function of separating the received data and sending the compressed audio data to the audio codec, sending the received application data to the communication controller, and decompressing the received audio data and sending it to the audio input / output unit. The communication application The application S uses the multiplexed application data to notify the communication application of a communication partner (described as a communication application D) of the communication rate, and the communication application S transmits the communication controller and the voice unit through the device driver. An ISDN communication device characterized by setting / changing a communication rate by controlling. 2. The ISDN communication device according to claim 1, wherein a confirmation-type association request / response is made through the application data that is multiplexed and communicated between the communication application S and the communication application D. Defining a packet, first establishing an association using the association request / response packet after connecting the communication line and changing the communication rate, and then performing an arbitrary communication using the application data. ISDN communication method. 3. The ISDN communication device according to claim 1 or the ISDN communication method according to claim 2, wherein the communication application S on the side requesting a communication rate change transmits the communication rate change request packet to the communication. When the voice of the voice unit is muted before being transmitted to the application D and the communication rate change response packet is returned, the I
The communication rate change is set to the SDN communication unit, and when the association is established thereafter, the voice of the voice unit is enabled at the new rate, and the communication partner (the side notified of the change in the communication rate) When the communication application D receives the communication rate change request packet, it mutes the voice of the own voice unit, transmits the communication rate change response packet, and then sends the own IS.
An ISDN communication method, characterized in that a communication rate is set to be changed for a DN communication unit, and thereafter, when the association is established, the voice of the voice unit on the local side is enabled at a new rate.