会议电视系统也称视听多媒体通信系统,包括可视电话和视听会议两种应用系统。可视一电话泛指在通信网中任何两个用户之间具有声、像和数据的多媒体通信业务。由于用户线带宽和通信网交换速率的限制,传统的可视电话通常是用户电话线带宽内的低速窄带多媒体通信。随着ISDN的推广,“带宽”与“速率”随之增加,这为可视电话或多媒体通信提供了良 Conference television system, also known as audio-visual multimedia communication systems, including video telephony and audio-visual conference two applications. Video-telephony refers to a multimedia communications service that has sound, video, and data between any two users in a communications network. Due to the limitations of subscriber line bandwidth and communication network switching speed, traditional videophones are generally low speed narrowband multimedia communications within subscriber line bandwidth. With the introduction of ISDN, the “bandwidth” and the “rate” increase accordingly, which provides good for videophone or multimedia communication