JPH04217139A - Isdn board and communication processing system - Google Patents

Abstract

PURPOSE:To ensure the better service with an ISDN board which is set on a data processor and processes the interface secured to an ISDN circuit. CONSTITUTION:The stored data on a data processor can be sent to an ISDN circuit with use of a code converting function 8 which performs the conversion of coded codes between the nonlinear and linear PCM codes. At the same time, the data sent from the ISDN circuit can be stored in the data processor. Then an adding function 9 is added to acid the voice signal to the output data of the function 8. Based on the addition processing of the function 9, the voice signal is compounded with the data stored in the data processor and then is outputted to the ISDN circuit and a telephone acoustic equipment of its own device.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to an ISDN board that is mounted on a data processing device such as a personal computer and processes an interface with an ISDN line, and an ISDN board that is installed on a data processing device such as a personal computer.
Regarding communication processing methods using SDN boards, in particular, ISDN boards that can provide more advanced services, and I
The present invention relates to a communication processing method that makes it possible to provide services without depending on the ISDN of the communication destination when using an SDN board.

0002

2. Description of the Related Art It is promising to utilize existing personal computers as communication terminals for providing multimedia communication services that take advantage of ISDN's high-speed communication functions and multi-channel functions. At this time, while ISDN can provide advanced communication services, it requires an interface function to realize connection processing between personal computers and ISDN because the connection procedure is more complicated than that of conventional telephone networks. It's coming. This interface function includes a terminal adapter and an ISDN board. This terminal adapter is prepared as a module corresponding to a modem in a conventional analog line, and is connected to an RS232C port of a personal computer or the like to realize data communication via ISDN. On the other hand, an ISDN board is installed in an option slot of a personal computer to realize a physical connection function with an ISDN and a connection procedure with an ISDN exchange.

Conventional ISDN boards are intended to combine the information processing function of a personal computer with the digital information communication function of ISDN, and in general, in addition to the ISDN connection function, they also have data link control functions and other It also has a communication function. Furthermore, by controlling the connection procedure from a personal computer, it is configured so that more sophisticated telephone services can be realized. In the future, some devices are configured to provide voice call services by being equipped with audio equipment for telephone services, such as handsets.

0004

[Problems to be Solved by the Invention] However, the first problem with conventional ISDN boards is that data communication services and voice communication services are treated as independent services, and digital audio from the line is not transmitted internally to the personal computer. It is not configured to be able to import audio data into a personal computer or send audio data from within a personal computer to a line. Therefore, with the conventional ISDN board, it is impossible to apply audio data reuse, such as storing digital audio inside a personal computer and reproducing the stored digital audio using a PCM sound source. The reason for this is that the encoding methods are different between the audio data for the PCM sound source used inside the personal computer and the audio data used on the ISDN line.

[0005] As a second problem, the conventional ISD
One problem with the N board is that it only implements digital communication functions and does not support data communication functions using voice band signals. For example, in a terminal adapter, RS
232C standard digital signal (e.g. 9600bps
It has a conversion function that converts the speed of 64 kbps of ISDN into a digital signal sequence of 64 kbps. This conversion function is, for example, V. 11
0 standard, even with conventional ISDN boards,
Some devices are equipped with this speed conversion function. However, even in this case, the conventional ISDN board does not have a configuration that performs conversion into a voice band signal realized by a modem. In other words, it only implements a digital data communication function and does not support a data communication function using voice band signals. From now on, conventional ISD
The N board cannot communicate with a personal computer communication center or the like connected to an existing analog network.

[0006] The present invention has been made in view of the above circumstances, and is a new ISDN board that makes it possible to provide more advanced services. The purpose is to provide a new communication processing method that makes it possible to provide

[0007]

[Means for Solving the Problems] Fig. 1(a) illustrates the principle configuration of an ISDN board of the present invention that can provide data communication services and voice call services at the same time, and Fig. 1(b)
2 illustrates the basic configuration of an ISDN board prepared to realize the communication processing method of the present invention that enables communication processing with communication terminals connected to an existing analog network. These ISDN boards will include telephone audio equipment, such as a handset, and will perform the interfacing process between the personal computer and the ISDN line.

In FIG. 1(a), 1 is an ISDN connection function corresponding to layer 1 of the OSI model;
This constitutes a physical interface for connection with N lines. When this ISDN connection function 1 receives a digital signal from an ISDN line, it separates the digital signal into a control channel signal (D channel signal) for connection with the exchange and a 64kbps voice signal and data information. Processing is performed to obtain an information channel signal (B channel signal). 2 is an ISDN connection control function corresponding to layers 2 and 3 of the OSI model, and extracts and interprets an ISDN connection control message from the control channel signal separated by the ISDN connection function 1. This ISDN connection control function 2 has a DMA request signal generation function 3 that generates a DMA request signal from an 8 KHz clock signal for audio signals obtained from the ISDN line.

Reference numeral 4 denotes a personal computer interface function, which processes an interface with a personal computer to which the ISDN board is connected. This personal computer interface function 4 is equipped with a DMA control interface. 6 is an audio interface function that processes the interface with connected telephone audio equipment; 7 is an audio codec that converts an analog signal into a nonlinear PCM code digital signal; 8 is a code conversion function that converts a digital signal of a non-linear PCM code into a digital signal of a linear PCM code, and also executes this inverse conversion process. The code conversion function 8 may output input data as is without executing code conversion processing. Reference numeral 9 denotes an addition function that adds the nonlinear PCM encoded data of the audio signal and the nonlinear PCM encoded data output from the code conversion function 8. Here, the audio signals to be added by the addition function 9 include those sent from the ISDN line and those sent from the ISDN line.
Some output to the line. Further, the addition function 9 may output the input data as is without performing addition processing.

In FIG. 1(b), the same parts as in FIG. 1(a) are indicated by the same symbols. 5 is a data buffer function, which handles data sent to the ISDN line,
10 is a communication destination function identification function provided in the ISDN connection control function 2, which buffers the data sent from the ISDN line. 11 is a data link control function that establishes a data link with a communication destination by executing an HDLC procedure; 12 is a speed conversion function;
13 is a first switch that converts the data information of the communication speed used in conventional PC communication to 64 kbps, which is the communication speed of the ISDN line, and also executes this inverse conversion process. 14 is a modulation/demodulation function that converts an analog signal into a digital signal and performs this inverse conversion process; 15 is a second switch that bypasses the acoustic interface function 6; A third switch 16 selects one of the modulation and demodulation functions 14, and selects one of the audio codec 7, the speed conversion function 12, and the first switch 13.

[0011]

[Operation] First, the ISD of the present invention shown in FIG. 1(a)
The function of the N board will be explained. In the present invention, ISD
N connection control function 2 controls the ISD according to the control channel signal.
When it detects that an audio signal is received from N line, DM
The A request signal generation function 3 generates a DMA request signal and sends it to the personal computer interface function 4. Upon receiving this DMA request signal, the DMA of the personal computer interface function 4 transfers the nonlinear PCM code audio signal that has been separated by the ISDN connection function 1 and passes through the addition function 9 and code conversion function 8 to the personal computer. I will transfer it.

[0012] In this way, by using the present invention,
It becomes possible to import digital audio from an ISDN line into a personal computer. Unlike data information, audio signals do not have a packet structure, so
In this way, the DMA can be directly connected to the personal computer.
By transferring the audio, digital audio from the ISDN line can be quickly imported into the personal computer, and the data can then be managed in a format optimized for the conditions of the personal computer, such as a PCM audio source.

[0013] In the present invention, when there is a request to output data stored in a personal computer to an ISDN line,
The personal computer interface function 4 transfers data to the code conversion function 8 according to the DMA request signal, so if the transferred data is a linear PCM code, the code conversion function 8 converts this data into nonlinear PCM code data. Convert to Then, the ISDN connection function 1 sends this nonlinear PCM code data that passes through the addition function 9 to the ISDN line. On the other hand, when nonlinear PCM code data to be imported into the personal computer is sent from the ISDN line, the code conversion function 8 converts this nonlinear PCM code data that passes through the addition function 9 into linear PCM code data. The personal computer interface function 4 transfers this data to the personal computer by DMA.

[0014] In this way, by using the present invention,
It becomes possible to send linear PCM encoded data normally used by personal computers to an ISDN line, and it also becomes possible to reuse audio data sent from the ISDN line as linear PCM encoded data in a personal computer.

In the present invention, when there is a request to synthesize the audio signal stored in the personal computer and the audio signal output from the telephone audio equipment of the own device and output it to the ISDN line, the code conversion function 8 converts the audio signal of this personal computer created with a linear PCM code into a non-linear PCM code, and the addition function 9 combines the audio signal of the converted non-linear PCM code with the telephone signal provided via the audio codec 7. The audio signal from the audio equipment is added. Then, the ISDN connection function 1 sends out the added nonlinear PCM code audio signal to the ISDN line. On the other hand, if there is a request to synthesize the audio signal stored in the personal computer and the audio signal sent from the ISDN line and output it to the telephone audio equipment,
The code conversion function 8 converts this personal computer audio signal created with a linear PCM code into a non-linear PCM code.
The addition function 9 converts this converted nonlinear P
The CM code audio signal and the audio signal sent from the ISDN line are added. Then, the audio codec 7 converts this audio signal into an analog signal, and the audio interface function 6 outputs this converted audio signal to the telephone audio equipment.

[0016] In this way, by using the present invention,
For example, it has become possible to use music stored in a personal computer as background music to send audio signals to an ISDN line. It becomes possible to output the audio signal sent to the device.

Next, the operation of the communication processing system of the present invention using the ISDN board shown in FIG. 1(b) will be explained. In the present invention, according to instructions from a personal computer,
The ISDN board first starts communicating with the destination according to the digital communication function. In this case, ISD
The communication capability in the calling message in the layer 3 message sent to the N line is specified as 64 kbps unrestricted digital data. If the communication partner has a digital communication function, a response message is sent back via the ISDN line, and communication is started. On the other hand, if the communication partner does not have a digital communication function, a disconnection message is sent back. In this case, immediately increase the communication capacity to 3.4KH.
The call is made again using the call message as the z signal. In executing such communication processing, in the present invention, the ISDN board is provided with at least a data link control function 11 and a speed conversion function 12 as a communication function for digital signals, and as a communication function for voice band signals. ,
Since it is equipped with at least a modulation/demodulation function 14 and an audio codec 7, it becomes possible to perform advanced communication processing not only with the ISDN network but also with communication terminals connected to existing analog networks. Note that although the personal computer performs communication function selection processing here, the ISD
The CPU function of the N board may perform processing to select the communication function.

[0018] In this way, by using the present invention,
At the transition stage to the ISDN network, it will be possible to perform communication processing with the existing analog network while complying with more sophisticated communication processing.

[0019]

EXAMPLES The present invention will be explained in detail below according to examples. FIG. 2 illustrates the system configuration of a communication processing system to which the present invention is applied. As shown in this figure, the ISDN board 20 of the present invention is provided to perform interface processing between a personal computer 70 and an ISDN network 80, and is used to connect telephone audio equipment such as a telephone 50, etc. The structure is as follows. This ISDN network 80 will coexist with the existing analog network 90 until a complete conversion to the ISDN network 80 is realized. Note that 60 in the figure represents a DSU.

FIG. 3 illustrates one embodiment of the ISDN board 20 of the present invention. In the figure, 21 is the CPU, 22 is the ROM
, 23 is a RAM, 24 is an address decoding logic circuit, 2
5 is an address bus, 26 is a data bus, 27 is a PC bus interface circuit, 28 is an ISDN interface control LSI, 29 is a transformer, 30 is a buffer block,
31 is a code conversion addition ROM, 32 is a parallel/serial conversion block, 33 is a parallel/serial conversion circuit, 3
4 is a communication control LSI, 35 is a V. 110 functional circuit, 36
is V. 22 modem circuit, 37 audio codec, 38
39 is an analog switch, 40 is a matrix switch, 41 is a PC bus connector, 42 is an 8-pin modular connector, and 43 is a 6-pin modular connector.

[0021] This PC bus interface circuit 27 includes:
The ISDN interface control LSI 28 realizes the PC interface function 4 explained in FIG. 1, and the ISDN connection function 1 and the ISDN connection control function 2 explained in FIG.
The buffer block 30 realizes the data buffer function 5 explained in FIG.
M31 converts the audio signal of the linear PCM code into the audio signal of the nonlinear PCM code, and performs addition processing of the converted audio signal of the nonlinear PCM code and the audio signal of the nonlinear PCM code output from the audio codec 37. death,
The communication control LSI 34 controls communication control processing, realizes the data link control function 11 explained in FIG. 11
0 function circuit 35 corresponds to the speed conversion function 12 explained in FIG. 110 method speed conversion processing is executed, and V.110 method speed conversion processing is executed. 22 modem circuit 36 corresponds to the modulation/demodulation function 14 explained in FIG. The audio codec 37 implements the audio codec 7 described in FIG. 1, and the matrix switch 40 executes switch processing for selecting circuit functions used in communication processing. The PC bus connector 41 is connected to the personal computer 70 shown in FIG.
2 connects the DSU 60 shown in FIG. 2, and the 6-pin modular connector 43 connects the telephone 50 shown in FIG.

FIG. 4 shows a buffer block 30, a code conversion addition ROM 31, and a parallel/serial conversion block 3.
2 illustrates one embodiment of No. 2. Here, the same components as those explained in FIG. 3 are indicated by the same symbols. As shown in this figure, the parallel/serial conversion circuit 33 shown in FIG. 3 is composed of a shift register, receives serial data from the audio codec 37, and shifts this input data in synchronization with a 64 KHz clock. By doing so, the conversion process to 8-bit parallel data will be executed.

As shown in this figure, the buffer block 3
0 is a 16-bit register 301 that latches linear PCM encoded data from the personal computer 70 that is input via the internal bus, and data that is output to the personal computer 70 (nonlinear PCM encoded data/linear PCM code). and a register 302 that latches the 8KHz (digitized data) in synchronization with 8 KHz and outputs it to the personal computer 70 via the data bus 26. Further, the code conversion addition ROM 31 includes a code conversion ROM 311 that converts 16-bit linear PCM encoded data inputted from the register 301 into non-linear PCM encoded data to obtain an 8-bit audio signal, and a parallel/serial conversion circuit 33. The nonlinear PCM code audio signal from the audio codec 37 inputted via the code conversion ROM 31
and an addition conversion ROM 312 that adds and outputs the audio signal of the nonlinear PCM code outputted by No. 1. Then, the parallel/serial conversion block 32 converts the nonlinear PCM encoded data output from the addition conversion ROM 312 into 8
A shift register 321 that loads in synchronization with a KHz clock and outputs it to the matrix switch 40 as serial data synchronized with a 64KHz clock, and a shift register 321 that outputs data such as audio signals input via the matrix switch 40 to a 64KHz clock. It is composed of a shift register 322 that executes conversion processing into 8-bit parallel data and outputs it to the register 302 by shifting in synchronization.

Next, an example of the operation processing of the present invention configured as described above will be explained. First, the process of reading data sent from the ISDN line into the personal computer 70 will be explained.

When reading data (linear PCM encoded data/nonlinear PCM encoded data) sent from the ISDN line into the personal computer 70, the matrix switch 40 uses the ISDN line provided via the ISDN interface control LSI 28. The input data is input to the shift register 322 of the parallel/serial conversion block 32, and this shift register 322 inputs this input data to the register 3 of the buffer block 30.
It is executed by inputting to 02. In this process, the data sent from the ISDN line is
Unlike data information, an M-encoded audio signal does not have header information, so if it is directly transferred to the personal computer 70 via DMA, it can be transferred to any arbitrary number within the memory capacity of the personal computer 70. It can be stored as data size.

In this embodiment, a code conversion ROM for converting linear PCM encoded data into nonlinear PCM encoded data is used.
Although disclosed as having only 311, a code conversion ROM for performing this inverse conversion is prepared, and this code conversion ROM
Nonlinear PC sent from the ISDN line according to M
Convert M encoded data to linear PCM encoded data,
It is also possible to configure the converted linear PCM encoded data to be transferred to the personal computer 70. In this way, there is no need to convert the encoded code on the personal computer 70 side.

Next, a description will be given of the processing when the audio signal stored in the personal computer 70 and the audio signal output from the telephone set 50 are combined and output to the ISDN line.

When performing this audio signal synthesis process, the register 301 latches the linear PCM encoded audio signal stored in the personal computer 70, and the code conversion ROM 311 converts this audio signal into nonlinear PCM encoded data. The addition conversion ROM 312 converts the nonlinear PCM code audio signal input from the audio codec 37 via the parallel/serial conversion circuit 33 and the nonlinear PCM code output from the code conversion ROM 311.
CM code audio signal and the shift register 321
converts the added nonlinear PCM code audio signal into serial data, and the matrix switch 40 converts the nonlinear PCM code synthesized audio signal of this serial data into I
It is executed by outputting to the SDN interface control LSI 28. According to this audio signal synthesis process, the music stored in the personal computer 70 is used as background music, and the audio signal output from the telephone 50 is sent to the ISDN line.
Various service processing can be provided.

In this embodiment, the addition/conversion ROM 312 adds the nonlinear PCM code audio signal generated by the telephone 50 of its own device, and the matrix switch 40 outputs the added audio signal to the ISDN line. Although it is disclosed as follows, the addition conversion ROM 312
However, the nonlinear PCM code audio signal sent from the ISDN line and generated by another device is added, and
By configuring the matrix switch 40 to output the added audio signal to the telephone 50 of its own device via the audio codec 37, the matrix switch 40 outputs the synthesized audio signal to the telephone 50 of its own device. It is also possible to adopt several configurations.

Furthermore, in this embodiment, the addition conversion ROM 3
12 is disclosed as one that exhibits an addition function, but this addition conversion ROM 312 is used in the personal computer 70.
If the nonlinear PCM encoded data from the audio codec 37 is configured to be set to a zero value and the addition process is performed according to the instructions from
Since it becomes possible to output to N lines, the linear PCM encoded data stored in the personal computer 70 can be converted to nonlinear PCM encoded data and output to the ISDN line.

As shown in FIG. 3, the ISDN board 20 of the present invention includes a communication control LSI that performs a data link function.
34, V. 110 functional circuit 35, V. 22 modem circuit 3
6 and an audio codec 37, as well as a switch function for switching these paths. In the present invention, communication processing is executed according to the following communication procedures in accordance with these functions.

That is, when making a call, the personal computer 70 first increases its communication capability to 64 kbps.
Using a calling message specifying unrestricted digital data, line connection processing is started assuming digital communication. When the response message is returned via the ISDN line and communication is started, the communication control LSI
34→switch 39→V. 110 Functional circuit 35 → Matrix switch 40 → ISDN interface control LSI
According to the circuit route No. 28, data transfer with the communication destination is realized according to the communication function of ISDN communication. on the other hand,
If the communication partner does not have a digital communication function, a disconnection message will be sent back, so in this case, the call is immediately made again using a call message with the communication capability set to a 3.4 KHz signal. According to this retransmission process,
When the response message is returned via the ISDN line and communication is started, communication control LSI 34→switch 3
9→V. 22 Modem circuit 36 → analog switch 38
→Audio codec 37 →Parallel/serial conversion circuit 3
Communication with the communication destination is started according to the circuit route 3→code conversion addition ROM 31 (however, the code conversion function and addition function are not activated)→parallel/serial conversion block 32→matrix switch 40→ISDN interface control LSI 28. That is, V. Data communication with the communication destination is started according to communication processing for voice band signals using the V.22 modem circuit 36 and voice codec 37.

By using the communication procedure of the present invention, it becomes possible to perform communication processing with the existing analog network while complying with more sophisticated communication processing during the transition stage to the ISDN network. .

[0034]

[Effects of the Invention] As explained above, according to the present invention,
It is possible to construct an ISDN board that can provide both data communication services and voice call services. According to the present invention, when using this ISDN board, it becomes possible to provide services without depending on the ISDN conversion of the communication destination.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle configuration of the present invention.

FIG. 2 is an explanatory diagram of a communication processing system to which the present invention is applied.

FIG. 3 is an embodiment of the ISDN board of the present invention.

FIG. 4 is an embodiment of the ISDN board of the present invention.

[Explanation of symbols]

1 ISDN connection function 2 ISDN connection control function 3 DMA request signal generation function 4 Personal computer interface function 5 Data buffer function 6 Audio interface function 7 Audio codec 8 Code conversion function 9 Addition function 10 Communication destination function identification function 11 Data link control function 12 Speed Conversion function 13 First switch 14 Modulation/demodulation function 15 Second switch 16 Third switch

Claims (5)

[Claims] Claim 1: Installed on a data processing device, IS
The ISDN board that processes the interface with the DN line is equipped with a DMA request signal generation function (3) that generates a DMA request signal from an 8KHz clock signal obtained from the ISDN line;
3) In response to the DMA request signal generated by DMA transfer, PCM encoded data input from the ISDN line is transferred to the memory of the data processing device, or PCM encoded data stored in the memory of the data processing device is transferred to the ISDN. An ISDN board characterized by being configured to transfer DMA to a line. Claim 2: Mounted on the data processing device, IS
In the ISDN board that processes the interface with the DN line, conversion processing of the encoding code between the nonlinear PCM code in the encoding format used in the ISDN line and the linear PCM code in the encoding format used in the data processing device is performed. According to the conversion process of the code conversion function (8), the data stored in the data processing device is converted into nonlinear PCM encoded data, and the data can be sent to the ISDN line. At the same time, I
An ISD characterized in that it is configured to convert nonlinear PCM encoded data sent from an SDN line into linear PCM encoded data and store it in a data processing device.
N board. Claim 3: Installed on the data processing device, IS
In the ISDN board that processes the interface with the DN line, conversion processing of the encoding code between the nonlinear PCM code in the encoding format used in the ISDN line and the linear PCM code in the encoding format used in the data processing device is performed. The code conversion function (8) to be executed, the nonlinear PCM encoded data of the audio signal output to the ISDN line or the audio signal input from the ISDN line, and the code conversion function (8)
), and according to the addition process of the addition function (9), the audio signal and the data stored in the data processing device are combined, and the ISDN An ISDN board characterized in that it is configured to output to a line or to telephone audio equipment. [Claim 4] ISD mounted on a data processing device
In a communication processing method that performs data communication with a communication destination via an N board, the ISDN board has a communication function for digital signals and a communication function for voice band signals, and also has a control channel provided from the ISDN line. By interpreting the signal, it is configured so that one of the communication functions can be selected, and when making a call, the first step is to make a call based on the digital communication function, and when there is a response from the other party, When communicating using the digital communication function and receiving a disconnection message instead of a response, the second step is to automatically retransmit based on the voice band data communication function. , a communication processing method characterized by: 5. The communication processing method according to claim 4, wherein the communication function for digital signals includes at least a data link control function (11) and a speed conversion function (12), and a communication function for voice band signals. A communication processing method characterized by comprising at least a modulation/demodulation function (14) and an audio codec (7).