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美帝贝耳系统从事于显象电话的研究,也关心电视电话对传输线带宽容量的要求。贝耳电话实验室在寻找降低这一要求的途径时,研制出一种系统,它可以传输图象的变亿面不必再次发送未变更的信息。
US Dibble system engaged in the development of the telephone research, but also concerned about the TV telephone transmission line bandwidth capacity requirements. While looking for ways to reduce this requirement, Bell Telephone Laboratories developed a system that can transfer images without having to re-send unmodified messages.