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在德国,光纤通讯系统作为DeutscheBundespost计划的一部分首次做了野外试验,这个系统是配置在柏林电话网的光纤传输线路上的.一九七七年九月介绍这个计划时,参与此计划的SEL公司论述了在光纤上传输数字化电视信号的可能性. SEL公司对数字化电视信号试验系统采用的体制是差分脉码调制方式(DPCM).将5MHz带宽的电视信号变换成3 1 Mbits~-1的二进制数字流,降底多余度.柏林计划也将使用这种比特速率.同时还论证了传送二个高质量伴音(立体声)信道的系统能力. 在发送方面,首先处理数字彩色电视信
In Germany, the optical fiber communication system was the first to have been field tested as part of the Deutsche Bundespost project, which is based on the fiber optic transmission line of the Berlin telephone network. The SEL company involved in the program was introduced when the program was introduced in September 1977 The possibility of transmitting digitized television signals over optical fiber SEL company’s system for digital television signal test systems is Differential Pulse Code Modulation (DPCM), which converts a 5 MHz bandwidth television signal into a 3 1 Mbits to -1 binary number Flow, down to the end of excess. Berlin plans to use this bit rate will also demonstrate the delivery of two high-quality sound (stereo) channel system capabilities in the transmission, the first deal with digital color television signals