KR100219168B1 - Video terminal apparatus for converting an optimal dynamic mode - Google Patents

Abstract

The present disclosure relates to an image terminal apparatus for optimal dynamic mode conversion in which an optimum mode conversion can be performed in an interconnection state between image terminals having a dynamic mode conversion function. The present invention stores the capacity of the other party's video terminal when connected, and compares the other party's capacity and the capacity of the other party's capacity at the time of mode conversion, and extracts the common capacity based on the greatest common factor, and extracts the extracted capacity of the mode conversion. Setting it as a candidate allows the user to specify a mode change within that candidate. Accordingly, the present invention provides an effect of increasing the possibility of mode conversion success during mode switching during connection.

Description

Video terminal device for optimal dynamic mode conversion

The present invention relates to an image terminal apparatus having a dynamic mode switching function, and more particularly, to failure of mode switching by reflecting only a common capacity for image, audio, and other data in a connection state between image terminals as a mode conversion candidate. The present invention relates to an image terminal apparatus for optimal dynamic mode conversion, which enables reduction and optimal mode conversion.

Recently, as the multimedia communication service is popularized, multimedia has been developed based on video communication, which can face and face conversations with far-flung opponents. Among them, the video conferencing system participates together, so that it connects with the other party through a network that can connect several regions together and delivers meeting information such as voice and video to the other party. In addition, an Integrated Service Digital Network (ISDN) is disclosed, in which conference information is simultaneously transferred in large quantities and at high speed using a single digital line. H.221 was recommended as a way to multiplex video, voice, and other data to realize video telephony and video conferences in ISDN. ISDN video telephony and video conferencing devices are called H.320 terminals under the name of the Recommendation.The three voice standards defined by the H.320 standard are G.711 (48-64 kbps narrowband) and G.722 (48). -64 kbps), G.728 (16 kbps narrowband).

In the video terminal as described above, the user cannot convert the capacity of the terminal during the connection, and has a static mode switching method that can only be turned off for the mode conversion. This mode conversion method cannot convert the capacity of the video terminal once in the connected state, and thus cannot reflect the data amount and user request at all. Thus, a prior art for solving this problem is disclosed in an image terminal apparatus having a dynamic mode conversion function of Patent Application No. 96-60782 (96. 11. 30.) filed by the same applicant. This application proposes a dynamic mode switching method to convert the capacity of the terminal to meet the needs of the user even during connection. For more details, refer to the application.

However, in the video terminal having the dynamic mode conversion function as described above, the capacity of the connected other video terminal is not considered at all and the user arbitrarily designates the capacity. Thus, the image terminal checks whether the mode conversion is possible with the designated capacity and generates an error message if it is impossible. As such, there is a high possibility of failure of mode conversion in the conventional dynamic mode conversion.

Accordingly, an object of the present invention is to extract the common capacity by comparing its capacity with the capacity of the connected terminal in mode conversion in order to minimize the failure of mode conversion and to perform the optimal dynamic mode conversion. The present invention provides an image terminal apparatus for optimal dynamic mode conversion that can be designated by a user within the capability.

1 is a block diagram showing an image terminal apparatus for optimal dynamic mode conversion according to the present invention;

2a-b is a diagram showing a hierarchical structure of capacity of a terminal;

3 is a monitor state diagram reflecting common acceptance capability with a counterpart access terminal in a user interface.

* Explanation of symbols for main parts of the drawings

10,20: video terminal device 11: the interface unit

12: terminal 13: monitor

In order to achieve the above object, an image terminal apparatus for optimal dynamic mode conversion according to the present invention is an image terminal apparatus that can be connected between terminals. Compared with the capacity of the stored opponent and the capacity of the stored opponent in the dynamic mode conversion, the common capacity is set as the mode conversion candidate, and the mode conversion candidate selected by the user during the set mode conversion candidate is selected. An interface set for converting the terminal, an interface unit for transmitting a selection according to the dynamic mode conversion of the user through the interface between the user and the terminal, and a mode conversion candidate from the terminal so that the user can select a mode conversion candidate It includes a monitor that displays capabilities.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing an image terminal apparatus for optimal dynamic mode conversion according to the present invention. As shown, the apparatus of the present invention includes the video terminal apparatuses 10 and 20 of the same configuration, which are interconnected. A terminal 12 connected to the other party's video terminal device 20 and converting modes according to a user's request through the interface unit 11, and a monitor 13 displaying the candidates capable of mode conversion to the user. It is configured to.

The operation of the image terminal apparatus for optimal dynamic mode conversion according to the present invention configured as described above will be described in more detail with reference to FIGS.

2A and 2B are diagrams illustrating a hierarchical structure of capacity of a terminal, and FIG. 3 is a state diagram of a monitor reflecting a common capacity with a counterpart access terminal in a user interface.

First, the two video terminal devices 10 and 20 are interconnected through a communication network such as ISDN, and transmit their own capacity to each other when connected. The terminal 12 in the video terminal device 10 receives and stores the capacity of the connected video terminal device 20. In addition, when the user selects the dynamic mode conversion function through the interface unit 11 in the connected state, the terminal 12 switches to the dynamic mode and compares the capacity of the counterpart terminal with its own capacity to have a common capacity. Extract

Referring to the audio capacity of FIG. 2A of the capacity hierarchy shown in FIGS. 2A-B, a terminal accommodating G.728 basically accommodates G.711. Therefore, a terminal having a capacity of G.728 and a terminal having a capacity of G.711 are connected by a G.711 voice coding method. However, because G.728 and G.722 capacities are separate, all information about the capacities must be transmitted when performing capacities exchange. And, according to the H.221 frame structure standard, there is a code (mode switching command) for setting the frame data using the capacity and information about the capacity of the terminal. Exceptionally, it does not exist in capacity but may exist in accommodation code. Referring to the video capacity of FIG. 2B, the picture capacity is divided into two parts, one related to the picture format, and the other related to the transmission rate (MPI) of the image data. will be. Since the image capacity has one structure, the terminal supporting the CIF structure supports QCIF, and the terminal supporting 1 / 29.97 (30 frames per second) can basically support the remaining three low frame rates. Therefore, when terminals having different capacity are connected to each other, the maximum acceptable capacity is extracted from the two terminals. For example, if the capacity of terminal A is 16 kbps for voice G.728 and 1 / 29.97 data rate for image CIF, and the capacity of terminal B is A-law for voice G.711 and 2 / 29.97 for image QCIF, terminal A In the connected state between the terminal and the terminal B, the capacity is 2 / 29.97 for the voice G.711 and the image QCIF.

Referring back to FIG. 1, the terminal 12 extracts a common capacity between connected counterpart terminals based on the greatest common factor. For example, the capacity of the terminal 12 itself is voice G.728, picture CIF, frame rate 15fps, data is 6.4k, 14.4k, 16kbps, and the capacity of the other terminal is voice G.728, picture CIF, When the frame rate is 15 fps and the data is 6.4k, 8k, 16kbps, the greatest common factor between the two terminals is voice G.728, picture CIF, and the frame rate is 15 fps, and the data is 6.4k and 16kbps. Thus, the terminal 12 displays the common capacity with the connected counterpart terminal on the monitor 13 as shown in FIG. Referring to FIG. 3, the monitor 13 displays capacity for audio, video, and other data, and the user designates a specific notation (eg, an X notation) for an item for which dual mode conversion is not possible. Do not do it. The user clicks and selects a desired portion through the interface unit 11 made of a mouse or the like while looking at the capacity candidates capable of mode switching displayed on the monitor 13. The terminal 12 converts the mode to the capacity selected by the user.

As described above, the present invention relates to an image terminal apparatus for optimal dynamic mode conversion, and when the mode conversion during the connection between the image terminals, each terminal stores the capacity of the other terminal at the time of connection and compares it with its own capacity. By extracting a common capacity and setting it as a mode conversion candidate, it is possible to increase the probability of success of the mode conversion.

Claims (2)

In an image terminal apparatus capable of connecting between terminals, When connecting with other terminals, the mutual capacity is exchanged and received, and the other party's capacity is stored.When the dynamic mode is changed, the capacity of the other party is compared with the other party's capacity and the capacity is set. A terminal for converting its capacity to a mode conversion candidate selected by the user during the conversion candidate; An interface unit for transmitting a selection according to the dynamic mode conversion of the user to the terminal through an interface between the user and the terminal; And And a monitor for displaying the capacities set from the terminal to the mode conversion candidate so that a user can select a mode conversion candidate. The terminal of claim 1, wherein the terminal receives and stores the capacity of the other terminal when connected to the other terminal, and stores the capacity of the other terminal and its own capacity when the user selects the dynamic mode conversion function through the interface unit. Compare and extract common capacity based on the greatest common divisor and display the extracted common capacity on the monitor so that the user can select within the common capacity. Image terminal device.