In this paper , the method of in - bore abnormal phenomenon remote detecting is presented . considering of the multi - channel transient signals automatic acquisition , a project of pcm signal hardwire transmission data automatic acquire system is put forward . in this system , a pcm demodulate board is designed , it can decode the pcm code string which contain the information of the multi - channel transient signals , it also can catch the useful data automatically , and transmit these data to upper pc by rs485 在該系統(tǒng)中,為了能夠解調(diào)出包含多路動(dòng)態(tài)信號(hào)數(shù)據(jù)的高碼速率pcm信號(hào),設(shè)計(jì)并制作了一種適用的pcm解調(diào)板,能夠從pcm碼流中恢復(fù)出位時(shí)鐘信號(hào),從而與發(fā)送端保持位同步和幀同步,從而對(duì)pcm碼流可靠地解調(diào)、緩存,并能根據(jù)計(jì)算機(jī)設(shè)定的觸發(fā)條件自動(dòng)地捕獲多路信號(hào)的有效段,然后利用rs485總線將這些數(shù)據(jù)可靠地遠(yuǎn)傳至計(jì)算機(jī)以供顯示、分析和保存。