【摘要】 为克服传统由分立元件构成的移频自动闭塞设备的故障率高、灵活性差、抗干扰能力弱的缺点,设计了以单片机为核心构成的3显示移频自动闭塞发送设备,利用单片机结合外部定时/计数器实现以及附属电路产生移频自动闭塞移频信号和低频调制信号.这种方法可以提高设备的可靠性、增强设备的灵活性.在此基础上通过硬件扩充和软件设置,也可适应多显示移频自动闭塞的需要.更多还原

【Abstract】 To overcome the shortcomings of traditional equipment of frequency shifting automatic block, a three display frequency shifting automatic block transmitting device was designed. It uses a single chip microcomputer as the main component, an external timer/counter and some simple auxiliary circuits to produce frequency shifting and low frequency modulation signals. This design provides the equipment with high reliability and flexibility. It can also adapt itself to the transmitting equipment with 4 , 8 even 18 displays with a slight extension of hardware and simple modification of software.更多还原