KR200242088Y1 - Wireless expanding pack for Personal digital assistant - Google Patents

Abstract

The present invention relates to a wireless expansion pack for PDA, and in particular, a video telephony service for sending and receiving video and audio by using a digital camera, a recorder, and a speaker function between the two users by connecting to a public communication network through a CDMA module installed in the wireless expansion pack. To provide.

The present invention implements the H.323 stack based on PDA (WinCE) and interoperates with PDA and existing communication network using wireless network for the first time, and is compatible with each communication network (019, 011, 016, 017, 018). It is possible to implement video telephony by mixing between PDA and PDA, between PDA and PC, and between PDA and video phone.

In addition, the present invention is characterized by providing an expansion pack for PDA which simultaneously supports a CF (Compact FLASH) type interface equipped with a digital camera and a CDMA module interface supporting IS-95C network.

The present invention provides a CDMA and CF interface simultaneously so that data communication using CDMA and image data capture using a CF interface can be used simultaneously.

Description

Wireless expanding pack for Personal digital assistant

The present invention relates to a wireless expansion pack for PDA based on the H.323 protocol, in particular to use a wireless expansion pack containing CDMA with a CF (COMPACT FLASH) interface.

In general, the main use of PDA (PERSONAL DIGITAL ASSISTANT) has a PIM (Personal Information Management) function that manages personal information such as address book, electronic notebook, schedule management, memo, and the function of listening to music using MP3 player.

Recently, as user's information communication demand is increased and the Internet is activated, the user wants a portable terminal with comprehensive functions such as e-mail, fax, voice call, etc. Calls will be made in the near future.

As such, the necessity of a PDA having a video / voice call function in response to user demand is increasing day by day, but the appearance of such PDA has not been achieved until now.

Specifically, the commonly known H.323 protocol is a specification established by the ITU for connecting to a general telephone network from a PC.

In the existing technology, the stack (library) supporting H.323 is already developed and operated on PC (Window OS Linux).

However, PDAs (WinCE) and mobile terminals do not have a stack (library) that supports H.323.

In addition, since wireless communication terminals using PDAs use CDMA, digital cameras with CDMA and CF type interfaces cannot be used at the same time. Therefore, video phones can be mixed between PDA and PDA, between PDA and PC, and between PDA and video phone. Couldn't implement

The object of the present invention is to provide a convenience of using a PDA by enabling a video phone to be mixed between a PDA and a PDA, between a PDA and a PC, and between a PDA and a video phone.

The present invention implements the H.323 stack based on PDA (WinCE) and interoperates with PDA and existing communication network using wireless network for the first time, and is compatible with each communication network (019, 011, 016, 017, 018). It is possible to implement video telephony by mixing between PDA and PDA, between PDA and PC, and between PDA and video phone.

In addition, the present invention is characterized by providing a wireless expansion pack for PDA that simultaneously supports a CF (Compact Flash) type interface equipped with a digital camera and a CDMA module interface supporting IS-95C network.

The present invention provides a CDMA and CF type interface at the same time so that data communication using CDMA and image data capture using a CF interface can be used simultaneously.

This is not only essential equipment for wireless expansion packs, but also the first products developed. If the CDMA module is upgraded in the future when the communication network is extended to the IMT2000, it can be used in the IMT2000 communication network.

The present invention aims to provide a video telephone service for transmitting and receiving video and audio by using a digital camera, a recorder, and a speaker function by connecting to a public communication network through a CDMA module connected to a PDA.

The present invention for achieving the above object is to install a CDMA module for wireless communication equipped with a CF interface in the wireless expansion pack connected to the PDA connector, the CF type digital camera in the CF type slot on the top of the wireless expansion pack And compress and restore images and audio input by digital cameras and recorders in PDAs with image data capture as H.263 (video codec) /G723.1 (audio codec), It is characterized in that the video phone transmission and reception between PDA users using H.323, the standard protocol of the wireless network.

1 is a perspective view of a wireless expansion pack of the present invention

Figure 2 is a perspective view of the wireless expansion pack, PDA, digital camera separated in the present invention

3 is a block diagram of a video and audio transmission and reception circuit for explaining the present invention.

<Code Description of Main Parts of Drawing>

10: Wireless Expansion Pack 13: CDMA Module

20: PDA 30: digital camera

40: public telephone network

The present invention implements the H.323 stack based on PDA (WinCE) and interoperates with PDA and existing communication network using wireless network for the first time, and is compatible with each communication network (019, 011, 016, 017, 018). It is possible to implement video telephony by mixing between PDA and PDA, between PDA and PC, and between PDA and video phone.

In addition, the present invention is characterized by providing an expansion pack for PDA which simultaneously supports a CF (Compact Flash) type interface equipped with a digital camera and a CDMA module interface supporting IS-95C network.

Accordingly, the present invention provides a CDMA and CF interface at the same time to enable simultaneous use of data communication using CDMA and image data capture using a CF interface.

This invention is described in detail by the accompanying drawings.

2 is a perspective view showing the use of the wireless expansion pack 10 and the PDA 20 of the present invention, the known PDA 20 having the display unit 21 and the connector 22 and the PDA 20 are inserted and fixed. It consists of a wireless expansion pack 10 including an insertion unit 11, a connector 12 for connecting to the PDA 20 and a CDMA module 13 installed therein. In the above, the CDMA module 13 is equipped with a CF type interface. In addition, a digital camera 30 having a CF type image data capturing function is mounted in the CF type slot 14 formed on the top of the wireless expansion pack 10, and a recorder and a speaker are built in the PDA 20. . In the above, the connector 12 may use connectors having various forms and various kinds of terminals, respectively. 15 in the figure is a battery.

The interface between the digital camera 30 and the PDA 20 is a compact flash (CF) type, and the PDA 20 has a voice communication, video and audio play, and wireless communication (TCP / IP) using CDMA. It shall be designed as possible.

In the present invention, the embodiment is used by mounting the digital camera 30 in the CF type slot 14 of the wireless expansion pack 10, but instead of the digital camera 30 by mounting a GPS or CF type memory, etc. Can also be used.

3 is a block diagram for explaining image / audio transmission / reception of the present invention, and includes an image input by a compact flash (CF) type digital camera 30 having a picture data capture function and a recorder in the PDA 20; Voice is compressed and decompressed as H.263 (video codec) /G723.1 (audio codec), and the standard protocol of the wireless network with the CDMA module 13 and the public telephone network 40 (PSTN), which is an H.323 / CDMA data network. Video call transmission and reception between PDA users using H.323.

The public telephone network 40, which is the above-mentioned H.323 / CDMA data network, is a well-known technique, and includes an IS-95C network 41 and 42, a gateway security device 43 (gatekeeper), and a multipoint conference controller 44 (MCU). , An input / output gateway 45 (media gateway), and a shared gateway 46 (shared gateway).

In the above, the CDMA module 13 and the digital camera 30 having the image data capture function are mounted on the wireless expansion pack 10. The PDA 20 has the CDMA module 13 and the CF type digital camera 30 mounted thereon. It is to enable simultaneous connection so that the image (video) input to the digital camera 30 and the audio data input to the recorder of the PDA 20 can be transmitted through the CDMA module 13.

That is, the present invention provides a wireless expansion pack for a PDA that simultaneously supports a CF interface on which the digital camera 30 is mounted and a CDMA module 13 interface supporting the IS-95C networks 41 and 42, thereby providing a CDMA module ( 13) and CF interface at the same time, data communication using CDMA and image data capture using CF interface can be used simultaneously.

In addition, the standard wireless communication function interworking with the public telephone network 40 is different from each other by implementing H.323, which is a standard protocol of a wireless network composed by a wireless communication provider such as 019, 011, 016, 017, using software in the PDA 20. Even network users can make video call communication. That is, the H.323 stack is implemented based on PDA (WinCE), and the PDA 20 and the existing communication network are interworked by using the public telephone network 40, which is a wireless network, and each communication network (019, 011, 016, 017, 018). It is compatible with PDA), so it is possible to implement video telephony by mixing between PDA and PDA, between PDA and PC, and between PDA and video phone.

The voice and video recording function and the play function capture the image data of 15 to 20 frames per second by using the digital camera 30 in the PDA 20 and record the user's voice by using the recorder in the PDA 20 and publicly. It is composed of software for playing image data and audio transmitted through the telephone network 40 on the PDA.

In addition, the image and voice compression function delivers wireless network by compressing or restoring the image and voice input by video camera and recorder to H.263 (Vedio) and G723.1 (Audio) by PDA software. It is configured to minimize the size of the image / audio data such that the video image or the voice is spoken in front of the user without persistence.

The voice compression function using G723.1 has improved the codec of G.723.1 / G.723, and the compression time is 10-12ms, which is improved from 35-40ms, and the decoding time is 0.5ms to 1ms. H.263 is a method that improves the existing H.261 recommendation, removes temporal redundancy using motion estimation and compensation, and spatial transform using transform coding. Compress the images in a complex way that eliminates redundancy. The input ratio stream buffer and the output ratio stream buffer in the PDA 20 allocate approximately 26kB, respectively, and the video buffer uses 760kB to store 20 frames and automatically adjusts the transmission amount according to the wireless network conditions to transmit the data. Added the ability to send many video frames.

The present invention is operated by the flow chart of FIG. 3, that is, when a response is sent by sending a connection signal to the counterpart, the image and voice are recorded by the recorders in the digital camera 30 and the PDA 20, and H. 263 / G723.1 compresses video and audio, and then transmits data to the public telephone network 40, which is an H.323 / CDMA data network, through wireless communication (TCP / IP) using the CDMA module 13 Through the step of confirming the presence or absence of data, the image and audio are decompressed, and the image and audio are played by software for playing the image data and audio on the PDA.

As such, the present invention makes a call to a user who tries to make a video call, and when connected with the user, captures and compresses the video and audio in real time and transmits the data through a wireless network to the other party. Receive video and audio, decompress it, and return to original video / audio. The video is shown through the screen of PDA and the voice is played through the PDA speaker. It will be possible.

The present invention is to enable a video call through a PDA, PDA users can use the PDA not only for personal information management and wireless Internet, but also anytime and anywhere with the other party to look at the other person's face to face, H.323 stack Is implemented based on PDA and interoperates with PDA and existing communication network using wireless network for the first time, and is compatible with each communication network (019, 011, 016, 017, 018). It is possible to implement video telephony by using a combination of video and video phones, which provides convenience of video telephony using PDA, and supports expansion pack for PDA that supports CF interface equipped with digital camera and CDMA module interface supporting IS-95C network. By providing CDMA and CF type interface simultaneously, data communication using CDMA and image data capture using CF interface are mixed. When it is possible to use.

Therefore, the present invention can be used in the IMT2000 communication network by upgrading the CDMA module when the communication network is extended to the IMT2000 in the future.

Claims (1)

In the wireless expansion pack 10 connected to the PDA 20 connector, a CF type slot formed on the wireless expansion pack 10 by installing a CDMA module 13 equipped with a CF type interface in the wireless expansion pack 10. And a digital camera 30 having a CF-type image data capturing function.