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本文对新近研制的一种载波主群信号编码设备作技术介绍。该设备把(60～1300)kHz的300路载波信号变换为34368Kb/S的数字信号,在脉码三次群传输系统中进行传输。 本文根据对该设备的噪音的要求,着重讨论了编码器的电平配置和编码位数;叙述了取样频率和编码器的输出码型等参数的选择,并扼要介绍了设备的组成和测试结果。 高速取样保持电路和编译码器是本设备的重要部件,都采用了先进的电路技术。在编码器中采用了ECL D-型触发器作比较器件,从而大大地简化了组装和调测。 在本设备中,取样频率为2864kHz,编码位数为10比特,噪音指标为-61.1dBmop/CH。实测结果各项性能均达到要求。
In this paper, a newly introduced carrier main group of signal coding equipment for technical introduction. The device converts the 300-channel carrier signal of (60 ~ 1300) kHz into 34368Kb / s digital signal and transmits it in pulse code three-group transmission system. Based on the noise requirements of this equipment, this paper focuses on the encoder configuration and the number of bits to be encoded. The selection of parameters such as the sampling frequency and the output pattern of the encoder is described. The composition of the equipment and the test results . High-speed sample-and-hold circuits and codecs are an important part of this equipment, all using advanced circuit technology. ECL D-type flip-flops are used as comparators in encoders, greatly simplifying assembly and commissioning. In this device, the sampling frequency is 2864kHz, the number of bits is 10 bits, and the noise index is -61.1dBmop / CH. The measured results meet the performance requirements.