HDB3码的编码，图形，功率谱密度。用于通信原理教学等-Code HDB3 coding, graphics, power spectral density. Communication Theory for teaching

实现了将64K低速NRZ码复接成2.048M高速HDB3码及其解复接过程，同时还用同步状态机剔除假同步和假失步的状态 -Achieved the 64K low-speed NRZ code 2.048M into high-speed multiplexing and demultiplexing HDB3 code then the process also removed using false synchronous state machine synchronization and f