JPH09321751A - Communication terminal equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cope with various communication lines without making circuit scale large by reducing the load on a system control part to reduce the delay of the output data. SOLUTION: A line control part 109 for transmitting and receiving data by controlling a communication line is included in an external communication module communication module attachable and detachable to this equipment and a data I/O part 114 for inputting and outputting the data to transmit and receive is provided for this equipment to communicate data corresponding to the various communication lines without line control means corresponding to each line inside of the communication terminal. In addition a communication control part 113 for generating and controlling a path for directly transferring data from the communication module to each block 13 to 107 for executing internal processing is provided to directly transfer data without passing through a communication terminal control part 112 between the respective blocks 103 to 107 through the generated path.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication terminal device, and more particularly to a communication terminal device utilizing the real-time property of a local bus.

[0002]

2. Description of the Related Art Currently, PSTN (existing telephone network), ISD
Communication terminal devices for communicating various media such as voice and video using various communication lines such as N (Integrated Services Digital Communication Network) and LAN (Local Area Network) are on the market.

In the above communication terminal device, although each communication line has a standardized multiplexing / separation protocol of each medium in the communication section, PSTN compatible and LAN compatible terminals excluding ISDN compatible terminals are Most are not compatible with terminals. In other words, of the various communication lines, each company is trying to establish its own direction for the lines other than the ISDN line.
The directionality has not been determined except for SDN lines.

Under these circumstances, it is a fact that each company is trying to standardize its own multiplexing / separation protocol so as not to converge the huge market of PSTN lines at present, but on the other hand, it is compatible with ISDN. The terminal is I
Its practical application has been promoted based on TU-T Recommendation H.320. Due to this trend, communication terminals for transmitting audio / video, etc. via the ISDN line have begun to spread.

Therefore, this time, from among the communication terminals corresponding to the various communication lines as described above, the ISDN line in which the multiplexing / separation protocol of the communication unit is standardized by all companies is taken up and a standard communication terminal is taken up. Will be explained.

The ISDN communication terminal uses a B channel (transmission rate = 64 Kbps) and a D channel (16
Kbps), H0 channel (384Kbps), H1 channel (15
Communication is performed using each transmission line of 36 Kbps.

In order to communicate with the partner terminal in this communication terminal, it is necessary to mutually exchange information such as contents of terminal capabilities and changes between the ISDN line (other communication terminal) and this communication terminal. is there. For that purpose, first, a call is made using an outband signal (D channel). Next, the B channel communication is enabled by the call setting and the response from the called terminal.

FIG. 9 is a block diagram showing an example of a videophone / conference system using a communication terminal compatible with the ISDN line. Note that FIG. 9 is a diagram showing a case where an INS net 64 line is used as an ISDN line, and the communication terminal configured as shown in FIG.
A videophone / conference system is constructed by connecting a plurality of devices via the Internet 64 lines. Hereafter, this FIG.
A conventional communication terminal will be described based on.

In the figure, 101 is a camera for inputting image data, and 102 is a microphone for inputting audio data. An image encoding unit 103 encodes image data obtained by the camera 101 (ITU
-T includes data compression such as Recommendation H.261). A voice encoding unit 104 encodes voice data obtained by the microphone 102 (including data compression such as PCM (Pulse Code Modulation)). Reference numeral 105 denotes a data generation unit other than the image / sound.

Reference numeral 108 denotes a multiplexing / demultiplexing unit, which multiplexes each data obtained from the image coding unit 103, the audio coding unit 104, and the data generation unit 105, and also multiplexes data given from the line control unit 109. Performs processing to separate image, sound, and other data. This multiplexing / demultiplexing method is, for example, ITU-T Recommendation H.221. The line control unit 109 takes in the multiplexed data generated by the multiplexing / demultiplexing unit 108 and transmits the multiplexed data to the communication line, or supplies the multiplexed data received from the communication line to the multiplexing / demultiplexing unit 108.

An image decoding unit 106 decodes the image data received by the line control unit 109 and demultiplexed by the demultiplexing / demultiplexing unit 108 (including data decompression). A voice decoding unit 107 decodes (including data expansion) the voice data received by the line control unit 109 and separated by the multiplexing / demultiplexing unit 108. 110 is a monitor for outputting image data, 111 is a speaker for outputting audio data, and 912 is a system control unit for controlling the entire system.

In the videophone / conference system having such a configuration, it is generally difficult to make one communication terminal correspond to a plurality of kinds of communication lines at one time. This is because if it is intended to support two or more types of communication lines, a line control circuit is required for that amount, and the line scale becomes large.

For example, consider the following three-point conference. If Mr. A uses a LAN line for Mr. B in the same company and an ISDN line for Mr. C outside the company, on the communication line, Mr. A is Mr. B. This means that the communication terminal for Mr. A needs a line control circuit for LAN and a line control circuit for ISDN.

That is, as the number of lines that can be handled at one time increases, the circuit scale becomes larger, and it becomes difficult to realize a portable and inexpensive communication terminal. Therefore, under such a condition, a communication terminal typified by a conventional videophone / conference system has one communication line (ISD in the case of FIG. 9).
Most of them are compatible with N lines.

Next, the shape of the conventional communication terminal will be described. When the communication terminal having the configuration shown in FIG. 9 was commercialized, the main shape was to make the configuration itself shown in FIG. 9 stand alone or supply it to the system as an expansion board for a computer. . However, in either configuration, in the configuration of FIG. 9, all the audio / video data must be controlled by the system control unit 912 once, so that there is a problem that the load on the system control unit 912 becomes considerably large.

Therefore, as one method for reducing the load on the system control unit 912, conventionally, a method of mounting two system control units 912 on the system itself has been used to solve the above problem. However, this has a problem that the cost is increased by using two system control units 912.

Therefore, in order to reduce the load on the system control unit 912 without increasing the cost, the ISA bus (Industry Standard) is specified in the specifications on the system bus side.
Architecture: DMA (Direct Memory Access) transfer, PCI bus (Peripheral Component Interconnect) in the standard bus of IBM PC / AT compatible personal computer
In (), the load on the system control unit 912 has been reduced by using a method such as burst transfer.

[0018]

Considering the above description, the following two problems can be considered in the conventional system shown in FIG. One is that the data such as audio / video is once controlled by the system control unit 912, so that the output data lacks real-time property. As can be seen from FIG. 9, the system control unit 912 intervenes in all the functional blocks to perform processing. This allows
There are drawbacks that the load of the system control unit 912 becomes heavy and that output video and audio are delayed. The other is that the implementation scale or the circuit scale becomes large when considering the specifications corresponding to various communication lines.

The present invention has been made to solve the above problems, and reduces the load on the system control unit.
An object of the present invention is to make it possible to reduce the delay of voice and to cope with various communication lines without increasing the implementation scale or circuit scale.

[0020]

In the communication terminal device of the present invention, various communication modules having a line control means for controlling a communication line to transmit and receive data are detachably attached, and the transmission and reception are performed by the line control means. Data I / O means for inputting / outputting data to / from the communication module, data processing means for performing predetermined internal processing on data input / output by the data I / O means, and the communication Communication control means for generating and controlling a path for direct data transfer between the module and the data I / O means and between the data I / O means and the data processing means, and the communication. A module and a communication terminal management means for controlling the communication control means.

[0021] Another feature of the present invention is that the communication terminal management means includes an attachment / detachment identification means for identifying the attachment / detachment state of the communication module, and a module identification means for identifying the type of the attached communication module. And a ownership granting means for granting ownership of the communication module bus to the communication control means in response to a request from the communication control means, wherein the data I / O means is the attachment / detachment identification means and Based on the identification result by the module identifying means, communication module managing means for managing the communication state in the communication module, and data for transmitting / receiving between the communication module, the communication module managing means and the communication control means. And a bus for a communication module obtained from

Another feature of the present invention is that the data processing means is an A / D conversion means for exchanging an analog signal input from the outside into a digital signal, and an internal digital signal for converting into an analog signal. It has a D / A conversion means for outputting it to the outside.

Another feature of the present invention is that the communication control means includes means for generating a periodic control signal according to the setting of the communication terminal management means, and automatically transferring data according to the control signal. Have.

Another feature of the present invention is that the communication control means has means for receiving an interrupt signal from the communication module, and the interrupt control signal is used to generate the periodic control signal. And

Another feature of the present invention is that the communication control means comprises an image data interface section and an audio data interface section, and when the communication control means receives the interrupt signal, The contents of the interrupt are analyzed, and the bus for the communication module and the interface unit for the image data are analyzed based on the analyzed contents.
Alternatively, a path selecting means for connecting a path to either the communication module bus or the voice data interface section is provided.

According to the present invention, as in the above-mentioned configuration, the line control means for controlling the communication line and transmitting / receiving data is included in the external communication module which is attachable / detachable to / from the communication terminal device.
Since the data I / O means inputs and outputs the data transmitted and received by the line control means, it is possible to support various communication lines without providing the line control means for each line inside the communication terminal device. It becomes possible to send and receive data. Further, according to the present invention, when the communication module is mounted, the data transmitted and received by the line control means is changed by the path generated by the communication control means.
Direct transfer is performed with the internal data processing means without going through the communication terminal management means, and the load on the communication terminal management means can be reduced.

Further, according to another feature of the present invention, it becomes possible to perform data communication corresponding to not only an analog communication line but also a digital communication line.

According to another feature of the present invention, data transfer is automatically performed by a periodic control signal generated by a communication control means provided separately from the communication terminal management means, It is possible to perform real-time data transfer asynchronously with the operation timing of the communication terminal management means.

Further, according to another feature of the present invention, the communication control means can grasp the content of the data received by the line control means in the communication module by the interrupt signal received by the communication control section from the communication module. Is possible.

According to another feature of the present invention, the communication control means analyzes the interrupt signal so that if the data received by the line control means is image data, an image data interface section is provided. A path is generated between the audio data interface unit and the audio data interface unit when the data received by the line control means is audio data. It is possible to perform image communication or voice communication with real time.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIG. 1 is a block diagram of a videophone / conference system using a communication terminal according to an embodiment of the present invention. Note that in FIG. 1, as the communication line, an ISDN line (INS net 64 line) is used as in FIG. Hereinafter, the communication terminal according to the present embodiment will be described based on FIG. 1. The same blocks as the functional blocks illustrated in FIG.
Duplicate description will be omitted.

In FIG. 1, the multiplexing / demultiplexing unit 108 and the line control unit 109 shown by the dotted line blocks are provided by a communication module detachably attached to the communication terminal device of this embodiment. A plurality of types of communication modules are prepared corresponding to various communication lines, and the user can freely decide which communication module is to be mounted on the communication terminal device.

Reference numeral 113 is a communication control unit, which is an image coding unit 103, a voice coding unit 104, and a data generation unit 105.
Data received from the data I / O unit 11 in a time division manner
4 and the data provided from the data I / O unit 114 to the image decoding unit 106 and the audio decoding unit 107. This communication control unit 113
Between the communication module and the data I / O unit 114 and the data I / O unit, as will be described later in detail.
Each block 103 that performs predetermined internal processing with the O unit 114
A path for directly performing data transfer with 107 (corresponding to a data processing unit) is generated, and control processing is performed.

The data I / O unit 114 takes in the data obtained by the communication control unit 113, and multiplex / demultiplex unit 1
08 and the line control unit 109 to transmit to the communication line, and has a function of supplying data received from the communication line via the line control unit 109 to the communication control unit 113.

Reference numeral 112 denotes a communication terminal management unit, which includes the communication control unit 113, the line control unit 109, and the multiplexing / demultiplexing unit 1.
Control for 08 will be described later. The communication terminal management unit 112 is the system control unit 9 shown in FIG.
It is included in a part of No. 12 and is not a complicated operation as the system control unit 912 but only a simple operation.

Next, a videophone having the functional configuration of FIG.
A data transmission / reception process in the conference system will be described with reference to the configuration diagrams and flow charts shown in FIGS. 2 to 4, a PCI bus is used as an example of the system bus. In addition, these FIGS.
Represents a process of transmitting and receiving voice data.

In FIG. 2, the communication terminal management unit 112 is
Attachment / detachment identifying means (not shown) for identifying the attachment / detachment state of the communication module detachably attached to the communication terminal of this embodiment.
And a module identifying means (not shown) for identifying the type of the communication module mounted on the communication terminal.
In this embodiment, a memory card (hereinafter referred to as a PC card) 207 is used as an example of the communication module. Although not shown in FIG. 2, the multiplexer / demultiplexer 108 and the line controller 109 shown in FIG. 1 are included in the PC card 207.

Reference numeral 202 denotes a bus expansion circuit for connecting the primary PCI bus 210 which is a system bus and the secondary PCI bus 211 which is a local bus. The bus expansion circuit 202 generally has a PCI function when configuring a system having two or more functions (in FIG. 2, data to the PCM unit 203 and data to be sucked up onto the primary PCI bus 210). It is an inevitable circuit as a specification, and this circuit is an effective functional block in the PCI bus specification in which the number of interrupt lines is physically small.

Reference numeral 203 denotes a PCM unit which A / D-converts or D / A-converts a voice signal exchanged with an external device such as the analog voice input / output device 208, and compresses / expands a digital voice signal. It has the function of performing. This PCM unit 203 is a speech coding unit 104 of FIG.
And corresponds to the voice decoding unit 107. The analog voice input / output device 208 is, for example, a headset / phone, and has the functions of the microphone 102 and the speaker 111 shown in FIG.

Reference numeral 204 denotes a PCMCIA (Personal Compute
r Memory Card International Association: A communication module management unit typified by a PC card (American standard organization for PC cards) controller, which connects the secondary PCI bus 211 and the tertiary bus (PCMCIA bus) 212, which are local buses. is there. This communication module management unit 204
Has a function of determining whether to operate the block in the PC card 207 based on the identification results of the attachment / detachment identification means and the module identification means.

The PC card 207 determines whether or not voice data is stored in the voice FIFO memory 206 inside the PC card 207 through an interrupt line by the communication terminal management unit 112.
It also has a function of notifying the communication control unit 113. The communication control unit 113 is connected so as to connect the secondary PCI bus 211 and an audio bus 213 that is a tertiary bus, and the communication control unit 113 transmits audio data through the route indicated by the alternate long and short dash line. It becomes possible to do.

FIG. 3 is a diagram showing the operation in the communication control unit 113 shown in FIG. 1 as a functional block. In the figure, reference numeral 302 denotes data i / f, which is PCI i / f301.
And a data bus (not shown). The data i / f 302 is a block that processes data other than audio / video, and is used by the data control unit 30.
3 is controlled.

The data control unit 303 has a register (not shown) controlled by the communication terminal management unit 112, and can be operated / operated by a simple operation such as turning this register ON or OFF. It has a function to switch non-operation. This switching is performed by analyzing the content of the interrupt when the interrupt signal is given from the PC card 207.

The image i / f 304 and the image controller 30 are also included.
5, the voice i / f 306 and the voice control unit 307 also have the same functions as the data i / f 302 and the data control unit 303, and the PCI i / f 301 and the image bus not shown, and the PCI i / f 301 and the voice of FIG. Bus 213
Send and receive images and sounds to and from.

The PCIi / f301 is the primary P of FIG.
CI bus 210, data i / f302, image i / f3
04, and voice i / f306 is transmitted and received. In addition, when transmitting / receiving the plurality of media described above, communication is performed via the PCI i / f 301. However, when transmitting / receiving only voice data as described in FIG. 2, the voice i / f 306 and the voice control unit are used. Only use 307.

Next, the operation of the communication terminal of this embodiment having the above configuration will be described. Figure 4 shows the PC from the other terminal
FIG. 5 is a flowchart showing an operation when voice data is received via the line control unit 109 in the card 207. FIG. 5 is a diagram showing a case where voice data is transmitted to a partner terminal via the line control unit 109 in the PC card 207. 3 is a flowchart showing the operation of FIG.

In FIG. 4, reception of voice data is started in step S401. At this time, the contents of the external communication module (PC card 207) attached to the communication terminal of the present embodiment are identified by the attachment / detachment identification means and the module identification means included in the communication terminal management unit 112, and as a result thereof, In response to this, the communication module management unit 204 operates and an operation of permitting reception is performed. In this state, a call is placed with the partner terminal.

In step S402, an external P having a function of notifying that voice data has been received from the communication line.
When the communication terminal receives the interrupt signal IRQ from the voice FIFO memory 206 in the C card 207, the communication terminal management unit 112 and the communication control unit 113 are notified that the voice data is received from the partner terminal.

Then, in step S403, the communication control unit 1
13 requests the communication terminal management unit 112 for ownership of the secondary PCI bus 211, which is a local bus, based on the received interrupt signal IRQ. As a billing method, an interrupt control circuit (not shown) in the bus expansion circuit 202 is used. Here, the communication terminal management unit 112 waits until the bus is released when another functional block is using the secondary PCI bus 211, and grants ownership of the bus when the bus is released ( Step S404).

The communication terminal management unit 112 is replaced by the communication control unit 113.
When the ownership of the secondary PCI bus 211 is granted to the communication control unit 113, the communication control unit 113 generates a periodic SYNC signal (control signal) for a voice signal (step S405). In the next step S406, the voice data received from the partner terminal is sent to the voice FIFO memory 20 through the route shown by the alternate long and short dash line in FIG. 2 at the timing according to the generated SYNC signal.
Read from 6.

In step S407, the secondary PCI bus 2
It is determined whether the ownership of 11 is released. If it needs to be released, the process proceeds to step S408, and if the ownership can be retained as it is, the process returns to step S403. Here, there are two kinds of states to shift to the processing of step S408. One is the case where the reception of the voice data is completed, and the other is the case where the forced release is required by the instruction of the secondary PCI bus 211. If it is desired to receive the voice data again, the processing is performed from step S401.

Further, in FIG. 5, transmission of audio data is started in step S501. In this state, it is assumed that a call has been placed with the partner terminal and the voice data can be transmitted. Next, step S502
In step S503, a periodic SYNC signal for voice signal is generated, and in step S503, voice data is taken into the communication terminal from the headset / phone 208 or the like.

In the processing of step S503, for example, the communication control unit 113 has a FIFO memory (not shown),
The voice data input from the headset / phone 208 is stored in this. The communication control unit 113 has a function of recognizing that the voice data is ready to be transmitted when the voice data is stored in the internal FIFO memory in this way.

When the communication controller 113 recognizes that the voice data is ready to be transmitted, the communication terminal manager 11 acquires the ownership of the secondary PCI bus 211.
A billing signal is transmitted to No. 2 (step S504).
Here, the communication terminal management unit 112 waits until the bus is released when another functional block is using the secondary PCI bus 211, and grants ownership of the bus when the bus is released ( Step S505).

In this way, when the communication terminal management unit 112 grants the ownership of the secondary PCI bus 211 to the communication control unit 113, the process proceeds to step S506 and the above step S5.
The audio data stored in the FIFO memory of the communication control unit 113 is transmitted to the partner terminal via the PC card 207 through the path shown by the one-dot chain line in FIG. 2 at the timing according to the SYNC signal generated in 02.

In step S507, step S of FIG.
Similar to 407, it is determined whether the ownership of the secondary PCI bus 211 is released. If it needs to be released, the process proceeds to step S508 to end the transmission of the audio data.
On the other hand, if the ownership can be retained as it is, the process returns to step S506. If it is desired to retransmit the voice data after performing the process of step S508, the process is performed from step S501.

As described above, according to the first embodiment, by the path generated by the communication control unit 113,
Since data can be directly transferred to the internal data processing means without going through the communication terminal management unit 112, more real-time data processing can be performed, thereby delaying output data. It is possible to reduce the number and reduce the load on the communication terminal management unit 112.

Further, according to the present embodiment, the multiplexing / demultiplexing unit 108 and the line control unit 109 are provided by the external communication module which can be attached to and detached from the communication terminal device of the present embodiment. It becomes possible to perform data communication corresponding to various communication lines without providing line control means for each line inside.

The present invention is not limited to the above embodiment. For example, although the communication line is an ISDN line in the above embodiment, it is possible to support all communication lines such as a PSTN line and a LAN by changing the communication module.

Although only the audio data has been taken up in the description of FIGS. 2 to 4, it is possible to handle not only the audio data but also the video data and other data. In FIG. 3, only the voice i / f 306 and the voice control unit 307 are used when transmitting / receiving only voice data, but other functional blocks 301 to 305 are also used when transmitting / receiving video data and other data. To do.

In FIG. 2, the PCI bus is taken as an example of the system bus specifications, but other ISA
The present invention is also applicable to all buses such as a bus and a VL bus (VESA local bus: one of 32-bit synchronous buses). In this case, the bus expansion circuit 202 becomes unnecessary and the secondary PCI bus 211 becomes the primary bus. And
The PCI i / f 301 in FIG. 3 has a function of a bus I / F block corresponding to the primary bus.

Further, in the above embodiment, in the flowchart of FIG. 4, the process of step S405 is the secondary PCI.
Although the operation is performed after the ownership of the bus 211 is permitted, the operation may actually be performed before the processing of step S404. Similarly, in the flowchart of FIG. 5, the process of step S502 may be performed at any time before the process of step S505.

In the above embodiment, the PC card 20 is used.
Although it is recognized that the voice data is received from the partner terminal by using the voice FIFO memory 206 in 7, the other method may be used. For example, if the silent data is set to "0", the logical O between several bits when the audio data is latched is set.
There is a method of recognizing that there is voice data when R is not "0".

Further, in the above embodiment, the SYNC signal is generated when a call is established with the partner terminal, but the SYNC signal is generated when the call is not actually established.
A signal may be generated.

(Second Embodiment) Next, a second embodiment will be described with reference to FIG. FIG. 6 is a functional block diagram showing the configuration of the communication terminal according to the second embodiment, and represents transmission / reception of voice data, as in the first embodiment. Note that, in FIG. 6, components denoted by the same reference symbols as those shown in FIG. 2 have the same functions, and thus duplicated description will be omitted.

In FIG. 6, reference numeral 604 is a communication module management unit, which is a PCI bus 210 and P
It is for connecting to the CMCIA bus 212. 61
A communication control unit 3 connects the voice bus 213 and the primary PCI bus 210. This communication control unit 6
13 makes it possible to transmit voice data through the route shown by the alternate long and short dash line.

In such a configuration, the communication controller 61
The PC card 2 has the same function as the PC card 207 with respect to the communication module management unit 604.
For 07, a pseudo operation is performed as if the same operation as the communication module management unit 604 is performed.

That is, when receiving voice data, the PC card 207 separates the multiplex data received from the partner terminal by the internal multiplex / separation unit 108 and sends it to the communication module management unit 604. From the data of each medium sent to the communication module management unit 604, only the audio data is extracted by the communication control unit 613 and supplied to the PCM unit 203. The video data and other data are supplied from the communication control unit 613 to a corresponding functional block (not shown) (for example, the image decoding unit 106 in FIG. 1).

On the other hand, when transmitting voice data,
The voice data taken in by the PCM unit 203 is supplied to the communication module management unit 604 via the communication control unit 613, given to the external PC card 207, and transmitted to the partner terminal by the line control unit 109 therein. .

The operation flow of this embodiment is shown in FIGS. 7 and 8. 7 and 8, the communication control unit 6
The operation itself of 13 is the communication control unit 113 of the first embodiment.
There is almost no difference, and the same processing as the processing of each step shown in FIGS. 4 and 5 is given the same step number. The difference from the first embodiment is step S7 in FIG.
03 and the processing of step S804 in FIG. 8, the bus requesting ownership is the PCI bus 210 of the system bus.

In the second embodiment as described above, the first
Similar to the embodiment described above, the path generated by the communication control unit 613 makes it possible to directly perform data transfer with the internal data processing unit without passing through the communication terminal management unit 112. The delay can be reduced and the load on the communication terminal management unit 112 can be reduced. Further, data communication can be performed corresponding to various communication lines without providing a line control unit corresponding to each line inside the communication terminal device.

The present invention is not limited to the second embodiment shown above. First, audio data is given as an example of data, but the present embodiment is applicable not only to audio data but also to all data such as video data and other data. Moreover, although the PCI bus is taken up as the specification of the system bus, it is also applicable to all other buses such as the ISA bus and the VL bus.

[0073]

As described in detail above, according to the present invention, the data generated by the communication control means enables direct data transfer with the internal data processing means without passing through the communication terminal management means. This makes it possible to perform data processing without going through the process of passing data once to the system control unit to perform data processing as in the conventional case. Therefore, it is possible to perform data processing in more real time.
The delay of output data can be reduced more than ever, and the load on the system control unit can be lightened more than ever.

Further, according to the present invention, the line control means for controlling the communication line and transmitting / receiving the data is provided by the external communication module which can be attached to and detached from the communication terminal device. It is possible to perform data communication corresponding to various communication lines without providing line control means for each line inside, and thus it is possible to correspond to all communication lines and further downsize. The communication terminal device can be provided.

[Brief description of drawings]

FIG. 1 is a block configuration diagram showing characteristics of a communication terminal device of the present invention.

FIG. 2 is a block diagram showing a configuration of a communication terminal device according to the first embodiment.

3 is a block diagram showing a functional configuration of a communication control unit shown in FIG.

FIG. 4 is a flowchart showing an operation of the communication terminal device according to the first embodiment when receiving data.

FIG. 5 is a flowchart showing an operation of the communication terminal device according to the first embodiment when transmitting data.

FIG. 6 is a block diagram showing a configuration of a communication terminal device according to a second embodiment.

FIG. 7 is a flowchart showing an operation of the communication terminal device according to the second embodiment when receiving data.

FIG. 8 is a flowchart showing an operation of the communication terminal device according to the second embodiment when transmitting data.

FIG. 9 is a block diagram showing characteristics of a conventional communication terminal device.

[Explanation of symbols]

 101 Camera 102 Microphone 103 Image Encoding Unit 104 Audio Encoding Unit 105 Data Generation Unit 106 Image Decoding Unit 107 Audio Decoding Unit 108 Multiplexing / Demultiplexing Unit 109 Line Control Unit 110 Monitor 111 Speaker 112 Communication Terminal Management Unit 113 Communication Control Unit 114 data I / O unit 202 bus expansion circuit 203 PCM unit 204 communication module management unit 206 voice FIFO memory 207 PC card 208 external voice input / output device 301 PCIi / f 302 data i / f 303 data control unit 304 image i / f 305 image control unit 306 voice i / f 307 voice control unit 604 communication module management unit 613 communication control unit 614 data I / O unit

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location H04N 7/15 G06F 1/00 320J

Claims (6)

[Claims] 1. Various communication modules having a line control means for controlling a communication line to transmit and receive data are detachably attached, and the input and output of data transmitted and received by the line control means to and from the communication module. Between the communication module and the data I / O means, a data I / O means for performing a predetermined internal processing on the data input / output by the data I / O means, And a path for direct data transfer is generated between the data I / O means and the data processing means,
A communication terminal device comprising: communication control means for controlling; and communication terminal managing means for controlling the communication module and the communication controlling means. 2. The communication terminal management means responds to a request from the communication control means, an attachment / detachment identification means for identifying the attachment / detachment state of the communication module, a module identification means for identifying the type of the communication module attached. Accordingly, the data I / O means includes ownership ownership means for granting ownership of the communication module bus to the communication control means, wherein the data I / O means is based on an identification result by the attachment / detachment identification means and the module identification means. And a communication module management means for managing the communication state in the communication module, and a communication module bus for obtaining data for transmitting and receiving from the communication module from the communication module management means and the communication control means. The communication terminal device according to claim 1, wherein 3. The data processing means comprises A / D conversion means for exchanging an analog signal input from the outside into a digital signal, and D / A conversion for converting an internal digital signal into an analog signal and outputting it to the outside. The communication terminal device according to claim 1 or 2, further comprising means. 4. The communication control means includes means for generating a periodic control signal according to the setting of the communication terminal management means, and automatically transferring data according to the control signal. Alternatively, the communication terminal device according to item 2. 5. The communication according to claim 4, wherein the communication control means has means for receiving an interrupt signal from the communication module, and the periodic control signal is generated by the interrupt signal. Terminal device. 6. The communication control means comprises an image data interface section and an audio data interface section, and when the communication control means receives the interrupt signal,
The interrupt contents are analyzed, and based on the analyzed contents, a path is connected to either the communication module bus and the image data interface unit, or the communication module bus and the audio data interface unit. 6. The communication terminal device according to claim 5, further comprising a path selection unit that does this.