KR100212454B1 - Telephone connection additional device and driving method for combistation - Google Patents

Abstract

The present invention relates to the addition of additional functions for the video conferencing system CombiStation. The present invention relates to a combination device comprising a microprocessor, a voice codec, a 2-4 wire conversion circuit, an ISA bus interface, and a Dual Port RAM. By attaching to the motherboard inside, it is possible to make field meetings such as external reporter's field report during the video conference on the existing LAN, and to increase the utilization of the combination station. do.

Description

Dial-up attachment for Combi Station and its driving method

The present invention relates to a dial-in additional equipment and a driving method of the present invention relates to adding an additional function for the video conference system, the combination of a development station in Korea Electronics and Telecommunications Research Institute, especially the combination station.

Combi station is a video conferencing system operating on LAN (Local Area Network), which is a terminal that enables multi-party video conferencing by transmitting / receiving multimedia data such as video and voice using a protocol on LAN. The hardware structure of CombiStation is a general personal computer equipped with Pentium processor and A / V (Audio / video) board designed for audio / video processing and LAN card for communication on LAN. The developed video conferencing software is installed.

Such a Combi station only allows users who are connected on a LAN, which is a dedicated network, to attend the conference. However, there may be external reporters during video conferencing, and if such external reporters use the most commonly used public telephone network, their access to current combination stations is not easy.

It implements signal matching function for two signal lines coming from public telephone network to enable the telephone network to be connected to the combination network, and also digitizes this signal so that it can be handled at the combination station based on personal computer. Needs to be. To connect these functions to the internal expansion bus of the computers that make up the CombiStation, they are designed as expansion boards and require control elements to control them all.

Accordingly, the present invention enables the telephone network of the public telephone network to be connected to the Combi station to transmit the report contents of the external reporter to the video conference participant on the LAN, and to deliver the remarks of the speaker among the video conference participants to the external reporter. Its purpose is to.

In order to achieve the above object, a dial-up attachment device for a combination station according to the present invention is divided into two transmission line and two reception line for two signal lines coming from a public telephone network and an input / output interface of an analog signal for each of these signal lines. A 2-4 wire conversion circuit which performs an operation for matching, an audio codec which converts and outputs an analog signal input from the 2-4 wire conversion circuit into a digital signal, and converts and outputs a digital signal into an analog signal; is characterized by being a port of the RAM 2 for inputting and outputting the voice codec and a digital signal, and a microprocessor for controlling the operation of the voice codec, performs data transmission and reception buffer role between the microprocessor and the device driver.

In addition, the method for driving a dial-up attachment device for a combi station according to the present invention for achieving the above object comprises the steps of initializing a device driver in a microprocessor, after initializing the device driver to initialize the voice codec and switch the switch And after the data is received from the voice codec, checking whether the dual port RAM is in a write ready state, and repeating the write until the write port is ready if the dual port RAM is not ready for writing. If the test result is ready for writing, writing the received digital voice data to the dual port RAM and notifying the device driver through an interrupt; and writing to the dual port RAM to the device driver. And terminating after the interruption occurs in the dual port RAM. The contents of the tram are read out and output to the voice codec.

1 is a service schematic diagram to which the present invention is applied.

2 is an internal configuration diagram of a dial-up attachment device according to the present invention.

3 is a structural diagram of a platform of a combination station hardware in which a dial-up attachment device according to the present invention is mounted.

4 is a flowchart illustrating important operations of the microprocessor in the dial-up attachment device according to the present invention.

5 is a structural diagram of the combination station in the state where the dial-up attachment device according to the present invention is mounted.

* Explanation of symbols for main parts of the drawings

202: modular jack 203: 2-4 conversion circuit

208: Voice Codec 211: Clock Generator

212: microprocessor 221: switch

222: Dual Port RAM 223: ISA Interface

The present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a service to which the present invention is applied, and the video conferencing system 105 is configured by inheriting five combination stations in a dedicated LAN 106. Each combi station performs video conference by transmitting and receiving multimedia data on LAN. In such circumstances it may be necessary for an external reporter to report using the telephone of the public telephone network 104. The matching to the signal from the CO 103, as shown in the combination of the station A (101) device that enable addition to the combination of a dial-up station is required to make this possible. If such an additional device is designed and mounted, the CombiStation A 101 can digitize the report content (voice reporter's voice) of the external reporter dialed in and transmit it to the rest of the combi station of the videoconferencing system. That is, the number of these is the video conference participant to see the contents of the external power in the form of reporter, and vice versa, it can also pass the voice information of the video conference participants to external view.

2 is a block diagram of a dial-up attachment device according to the present invention. These additional devices are designed in the form of computer expansion boards and connected to the bus inside the computer. CombiStation's hardware architecture is a personal computer with a Pentium processor motherboard equipped with an A / V board for audio and video processing, which has three peripheral components (Peripheral Component). Interconnection (PCI) bus slots and four Extended Industrial Standard Architecture (EISA) bus slots. These additional devices are designed using an Industrial Standard Architecture (ISA) bus, which has a relatively simple bus structure, so that it can be mounted in a compatible EISA slot. In order for these additional devices to operate on the CombiStation, software is required to drive them, which are installed in the CombiStation in the form of device drivers. Also equipped with a dial-up additional equipment inside the microprocessor, and control over the call connection and performs a communication control program or a predetermined method for transmitting and receiving data to the device driver with the combination station. Video conferencing software can then control the device driver to implement services for dial-up.

The main structure of a dial-up portion according to the present invention comprises a microprocessor 212, an audio CODEC 208, the 2-4 wire conversion circuit (203), ISA bus interface 223, of the port 2 (Dual Port) RAM ( 222). The signal line connection 201 from the trunk line is connected by using the modular jack 202, and another modular jack is provided to connect the telephones to bypass the signal line during normal telephone conversation (224).

When the dial-up function is started in the additional device, the switch 221 cuts the signal line connected to the telephone under the control of the microprocessor 212. The voice signal from the trunk line is then connected to the 2-4 line conversion circuit 203. The 2-4 line conversion circuit 203 is an analog signal for the audio codec 208 which constitutes the next stage for each signal line and the part which separates two transmission line and two reception line for two signal lines coming from a public telephone network. It consists of a circuit for matching the input and output interface of the desired operation is performed. The voice codec 208 receives an analog signal from the 2-4 wire conversion circuit 203 (204), digitizes and outputs it (209), and also converts the digital signal 210 received from the microprocessor 212 into an analog signal. To perform an output 205 function. However, the voice codec 208 should use a codec applied with the same coding scheme as that mounted on the A / V board of the CombiStation in order to make the digitized code compatible with the voice on the A / V board of the CombiStation.

The microprocessor 212 uses the phone connection additional parallel / serial input and output, an internal memory such as a one-chip type general one chip equipped with a microprocessor to perform the function of controlling the overall operation, and for this purpose the device.

Looking at their operation, the microprocessor 212 has a codec control element 214 and initializes the codec to control the desired operation. When the codec is in operation, the digitized voice signal from the codec is input through the serial inputs and outputs 215 and 216 of the microprocessor 212. In order to synchronize in this process, the microprocessor 212 and the voice codec 208 receive the same clock from the clock generator 211. The microprocessor 212 transfers this data through a dual port RAM 222 to a device driver, which is the infrastructure of video conferencing software for use by the Combi station. This process is described in detail. First, the microprocessor 212 writes data to the dual port RAM 222 through which digital voice data is sent to the device driver, and the device is connected using the interrupt 1 (INTI) 219 terminal. Interrupt the driver. The device driver then reads the contents of the data in the dual port RAM 22 using an interrupt call routine. In the opposite case, the device driver writes the corresponding digital voice data into the dual port RAM 222. At this time, when the data becomes full in the dual port RAM 222, the dual port RAM 222 automatically interrupts the microprocessor 212 through the INTO 218 by a signal line connection. The microprocessor 212 reads the corresponding data. That is, the dual port RAM 222 is connected to the microprocessor 212 and the computer ISA bus so that the video conferencing system and the telephone connection serve as a buffer for data transmission and reception with the device.

3 is a structural diagram of a platform inside the CombiStation hardware in which the telephone connection device according to the present invention is mounted, and three PCI bus slots 303 and four EISA bus slots 302 are mounted on a Pentium motherboard. Doing. The dial-up attachment 301 according to the present invention will be mounted in the EISA bus slot 302.

4 is a flowchart of the main operation of the microprocessor mounted in the dial-up attachment device according to the present invention. First, the microprocessor performs a predetermined initialization operation to communicate with the device driver (401). The microprocessor initializes the voice codec and switches off the switch to block the signal line to the telephone (402). The microprocessor then receives data from the codec in a predetermined manner (403) and checks whether the dual port RAM is ready for writing (404). If the test result is not ready for writing, the test operation is repeated until it is ready for writing. When the test result is ready to be written, the received digital voice data is written to the dual port RAM, and the device driver is notified through the interrupt (406), and it is checked whether to terminate (410) or the interrupt return is performed. (409). It then performs an interrupt branch (408) and moves to step 403 or if an interrupt occurs from dual port RAM (408), it checks whether the dual port RAM is ready for reading (405). ). If test results 2 would of not port (Dual Port) Preparation RAM is read in the step 405 and repeatedly performs the step 405, reading the contents of two of the ports (Dual Port) RAM if the read-ready audio The codec outputs it (407).

5 is a structural diagram for explaining the operation of the combination station in the state where the dial-up attachment according to the present invention is mounted. In the present invention, only the operation structure in which the dial-up attachment is operated in the CombiStation and the software elements necessary for the same are described, and the details thereof are to be connected to the video conferencing software of the CombiStation, and thus the contents are excluded from the present invention. Shall be.

In the case of the audio signal flow only, there is an A / V board 511 which is a hardware module at the bottom. The audio portion of the A / V board 511 and by encoding the input sound to be micro-decoding the audio data from the function and the device driver is sent to the parent device driver performs a function of converting into voice, and outputs to the speaker. The A / V device driver 510 on the top of the A / V board 511 functions to recognize the A / V board 511 with respect to the operating system of the CombiStation. For audio signals, the audio control software Mic /speak.d11 (504). The audio control software Mic / Speak.d11 504 performs a desired operation under the control of the video conferencing software 501. When this dial additional device 513 added thereto is designed in the present invention, in order to make the dial-up device drivers for driving the same, and should be created to meet the standard of the call connect additional devices, to utilize it in the video conferencing software It is necessary to add Mixing.d11 505 to the audio control element. The role of Mixing.d11 (505) to the audio control element performs a function of separating and mixing functions to the digital voice coming from the digital audio and audio / video device drivers (510) coming from a telephone connected to the device driver 512. When the above functions are completed, the video conferencing software can use the software modules of the infrastructure 502 to conduct video conferencing that can be dialed from a public telephone network.

As described above, according to the present invention, when a dial-up function is added to the combi station, an on-site meeting such as an on-site report of an external reporter can be performed during a video conference on an existing LAN, thereby increasing the utilization of the combi station. have.

Claims (2)

Separated into two transmission lines and received two-wire line to the signal line 2 comes from the public telephone network, and the 2-4 wire conversion circuit that performs an operation for adjusting the input-output interface of the analog signal for each of these signal lines, the 2-4 wire conversion and a microprocessor for converting the analog signal input from the circuit into a digital signal and outputting the input and output and controls the operation of the speech codec the audio codec and the audio codec and a digital signal that is converted to an analog signal and outputs the input digital signal, And a dual port RAM serving as a data transmitting / receiving buffer between the microprocessor and the device driver. Checking whether the initialize After initializing the stage, and the device driver to initialize the device driver from the microprocessor speech codec and a step of switching the switch, the port RAM of 2 After receiving data from the voice codec writing readiness by the steps of: repeatedly until the write ready if it is not or write ready, the two of the do port RAM to write the digital audio data received when the ready writing the result of the check that the writing readiness to port RAM of the second and notifying the device driver through one after the interruption, and terminating after performing the write to port RAM of the second to the device driver, if the interrupt occurred in port RAM of the second to read the contents of a port RAM of the second For the Combi station, characterized in that the step consisting of outputting the voice codec The driving method of the device connecting portion.