摘要
提出了在智能仪表中对传感器输出调幅信号实现解调的一种新方法。借鉴半波相敏检波的基本原理,采用载波信号作为微机的中断触发信号,采集调幅信号,可直接获得调制信号幅值离散点的数字量,在实现解调的同时完成信号测量。给出了用微机实现信号解调的基本原理、基于单片机AT89C2051设计的硬件接口电路以及软件设计的基本思路。
It presents a new method on demodulation of AM signal from sensors in intelligent instrumentation. Based on the principle of semi- wave phase - sensitive detection, the carrier wave signal is adopted as inter- ruptive trigger signal of microcomputer and AM signal is acquired. In this way, the digital amount of discrete point of AM signal can be directly got and the signal measurement can be completed while demodulating of AM signal, It presents the method of demodulation of AM signal with microcomputer, designs the hardware interface circuit with AT89C2051 and basic idea about software device.
关键词
调幅信号
解调
智能仪表
微机
Amplitude Modulation Signal
Demodulation
Intelligent Instrumentation
Microcomputer
