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可视电话是一种使人们在通话时能够看到对方影像的电信新业务。目前,可视电话在发达国家日趋普及。在我国,某些政府部门已经开始使用可视电话,并开始进入大众生活中。可视电话大体上分为两类:一类是在综合业务数字网(ISDN,即“一线通”)上工作的可视电话,它符合国际电信联盟(ITU)的H.320标准,每秒种可以传输15帧以上的画面;另一类是在普通电话网上工作的可视电话,它符合ITU的H.324标准,每秒钟可以
Videophones are a new type of telecommunications service that enables people to see each other’s images while on a call. At present, video telephony is increasingly popular in developed countries. In our country, some government departments have started using videophones and started to enter the public life. Videophones generally fall into two categories: videophones that operate on Integrated Services Digital Network (ISDN), which comply with the International Telecommunication Union (ITU) H.320 standard, per second Can transmit more than 15 frames of picture; the other is the video phone working in the ordinary telephone network, it meets ITU’s H.324 standard, every second