Video Phone Codec Chip Technology

Video Phone Codec chip technology

Video phone editing

Codec chip technology is the key to the development of video telephony, there is no core codec chip, video phone can only be a passive water, without the wood. Voice and image in the transmission, must be compressed coding - decoding process, and the chip is bear the responsibility of coding and decoding, only the chip at the output of the voice and image compression and compiled into a suitable communication line transmission of special code, at the same time The receiver will be a special code into people can understand the sound and images in order to form a complete transmission process, so that both sides to achieve the sound of communication between the exchange.

The transmission line affects the communication quality of the video telephone. The traditional telephone line is an ordinary twisted pair, mainly used to transmit voice, video and audio transmission at the same time, the transmission rate can only reach 33.6K, so in the ordinary telephone line support, can not transmit clear and consistent images.

Agreement standards are not unified, affecting the marketing. Although there are manufacturers to launch video phone, but because they are fragmented, there is no uniform industry standards, a variety of video phone can not communicate, affecting the video phone market expansion. In the case of the agreement is not uniform, only the user to buy the same type of video phone to achieve "visual" effect, if a user to buy a manufacturer of video phone, and B users to buy the B, then they call It can not "visual" the.

There is a problem editing

Because of technology, line and industry management and other aspects of the problem, resulting in a video phone for decades still away from the user, the market did not pick up.

- telephone as people's daily life, work indispensable communication tools, with its convenient, fast and other characteristics are widely used, but the ordinary telephone can only be "only heard the sound, but not its people." Hope in the call at the same time to see each other's voice and smile has become a dream of many people desire. This year's Spring Festival, Beijing, Shanghai, Guangzhou, more than 10 local telecom sector jointly launched in the country for the first time the video phone New Year event, so that people through the phone and distant mountains and rivers of loved ones, friends wish to meet, video phone The launch will undoubtedly provide people with more convenience.

- video phone is a category of multimedia communications, is a widely used video conferencing system, so that people can see each other in the call image, it is not only applicable to family life, but also can be widely used in various business activities, Distance education, confidential monitoring, hospital care, medical diagnosis, scientific investigation and other industries in a variety of areas, which has a very broad market prospects.

Basic classification editing

According to experts, video telephony in the transmission channel can be divided into PSTN (public telephone network) type, ISDN (integrated services digital network) type, network type and other means. In the PSTN work on the video phone, you can transfer 10-15 frames per second screen; work on the ISDN video phone, you can transfer more than 15 frames per second screen. At present, the video phone products are mainly two types, one is a personal computer as the core of the video phone, in addition to the computer is also equipped with a camera (or small camera), microphone and speakers and other input and output devices; the other is dedicated video Telephone equipment (such as one type video phone), it can be the same as ordinary telephone, direct access to the home phone line for visual calls. As the popularity of ordinary telephone lines is high, so the public telephone network to work the most development potential of video telephony.