So pulse blood oxygen signal and various of interaction noise are analysed, the former have character of strong periodic and can be treated as stable procedure with time correlation 脈搏血氧信號(hào)具有很強(qiáng)的周期性,在一段時(shí)間內(nèi)可看成是平穩(wěn)過程,時(shí)間上先后相關(guān)。
While motion artifact is caused by non-regular shiver of patient . given enough time delayed, motion artifact signal have poor or even no self-corelation . so do the other sort of interaction noise . thus these two category of signal may be distinguished by there characteristic of self-correlation, and the noise may be eliminated 運(yùn)動(dòng)偽差,一般都是由被測對象不自覺地或不受控地抖動(dòng)引起,因而只要時(shí)間足夠長,運(yùn)動(dòng)偽差信號(hào)在時(shí)間上相關(guān)性極弱或先后不相關(guān);同樣,其他的高低頻干擾如高頻電刀的干擾亦是如此。