Digital Electronics >> video conference

Founded in 2000, DGTC Digital Electronics Co., Ltd is one of the leading China video conference manufacturer and wholesaler of audio & video products, consumer electronic products and other digital digital electronics in China. Our company has complied with ISO9001 and SO14000 standards. All our products have attained CE, FCC and RoHS certification. We also accept OEM, ODM and SKD orders from renowned companies such as HP, Sony, IBM, Canon, Philips, Apple, Kodak, Olympus, Nikon, Panasonic, Casio, Samsung, JVC, Nokia, LG, Sharp, NEC, Motorola, Siemens, Dell, Toshiba and so on.

Video Conference Introduction
To consider hard software for video conference communication. Among great variety of programs for video conference organization there are some the most famous which we are going to consider today - Microsoft NetMeeting, CU-SeeMe and Internet Phone 5. In the end you will be given results of the test made with a definite equipment. Here we won't touch upon such issues as coding of audio-video information and network aspects. In the appendix you can find explanations to some terms connected with a conception of video conferencing.

Microsoft NetMeeting for Windows 9x and Windows NT serves as convenient means for holding conferences on the Internet and corporate networks. This program gives the same possibilities as the CU-SeeMe packet, plus it provides joint usage of applications. So, any Windows applications can be used by participants jointly what increases efficiency of work considerably. This is realized regardless of whether other participants possess an application provided by one of them for joint work.

The program ensures good video quality and offers minimum number of settings as compared to other programs. NetMeeting supports the standard of audio- and videoconferences H.323 which includes H.263 video codec. H.323 standard provides interaction of NetMeeting with other compatible programs of videotelephony clients such as Intel Internet Video Phone.

The master NetMeeting Resourse Kit allows to configure any program at option and create an installation file. This tool is quite useful if you need to set NetMeeting in a corporate network with uniform program settings. Setup of Internet Locator Server allows to see other users and hold a videoconference if necessary. The program supports transmission of images, voice mail functions, joint work on documents, file transmission and other possibilities. It will help you to find an interlocutor according to a communication language, interests and other features with an integrated VocalTec Community Browser.

Our tests revealed serious differences among the products. The best of them were remarkable for simplicity in usage and worked flawlessly with different communication channels, even at "modem" data rates. The others appeared largely exacting, complicated in setup and worked bad via narrow-band communication channels.

The camera Alaris gave out images at the maximum of 10-13. This camera is limited by a parallel port via which it connects to the computer. Another downside is high load of the processor and the memory. Besides, the camera was tested with Videogram Creator, a program included in the complete set (see Table 3). This camera is not the best choice for video conference organization. It's good only for home use.

The Creative camera was capable to give 10-15 fps. The higher result was reached (30 fps) only with the software included in the complete set (Video Blaster WebCam Control) (Table 4). So, possibilities of the camera greatly depends on the power of the computer and the usable codecs in the programs of video conferencing. This camera was used only on the first computer because of an IR-port.

And concluding I'd like to make some recommendations concerning a choice of the video camera for conference communication. The specs of your computer would define exactly the required video equipment. The camera with video image capture board should be recommended for weak computers with a processor of Pentium class, though it may be used successfully on more powerful computers. If you have Pentium II or higher and USB-port at your disposal, we'd advise to buy a camera with USB-interface as the simplest in installation and ideal in "price/quality" ratio.

Usage of such medium as Ethernet 100 Mbit/s doesn't cause strong changes. Audio and video quality get improved slightly, however video conference system efficiency gets stronger in the presence of other applications on the net. Besides, such net usually doesn't feature any problems with joint usage of application programs and audit board. What to choose? In case you are to organize video conferencing in a small office, you'd better take CU-SeeMe packet with an installed server-reflector and 100Mbit/s net bandwidth. Such combination is optimal as far as "price/quality" is concerned.

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