说明：  巴克码生成与测试电路。 当计数脉冲不断进入由Q3Q2Q1组成的三位二进制异步计数器时，3-8译码器的8个输出经反相器后顺序输出高电平。其中五路信号经“或非”后再和其中3路“或”，在Y端便可顺序产生11000100代码序列。
(Barker code to generate and test circuits. When the count pulse entering from Q3Q2Q1 composed of three asynchronous binary counter when the 3-8 decoder 8 output by inverter output high after the sequence. Rd which signal )