本文基于數(shù)字信號(hào)處理中信號(hào)經(jīng)過多次疊加平均后，信號(hào)中的隨機(jī)噪聲將被消除的原理，設(shè)計(jì)了一種針對(duì)周期性信號(hào)的隨機(jī)噪聲消除電路。該電路主要由鎖相倍頻、周期延時(shí)及放大電路組成。本文對(duì)該電路的原理進(jìn)行分析，并通過實(shí)驗(yàn)對(duì)包含有較大隨機(jī)干擾的周期性信號(hào)進(jìn)行處理，得到了消除各種隨機(jī)干擾的檢測(cè)信號(hào)。該電路目前已成功用于EAS系統(tǒng)中的隨機(jī)干擾信號(hào)的消除。

　　Abstract:

　　Based on the theory that the random noise of digital signal will be eliminated after multiple stacking average， this article designed a random noise elimination circuit aiming at periodic signals. The circuit was mainly consisted of phase-locked frequency circuit， cycle delay circuit and amplifying circuit. This paper analyzed the theory of the circuit， processed periodic signal that contained a large random interruptions in the experiment， and got detection signal which could eliminate all kinds of random interruptions. The circuit has been successfully used in EAS system to eliminate the random interruptions signal.