The music alarm clock from SCM system is the smallest system and the expansion of LED display circuit and voice circuit .
该音乐闹钟系统是由单片机最小系统及扩展LED显示电路和语音电路组成。
Bit synchronous clock recover circuit is the key part of the communication system, it can exactly recover the synchronous signal from input data stream.
位同步时钟信号的提取是通信系统中的关键部分，应用数字锁相环可以准确地从输入码流中提取出位同步信号。
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