The adaptive filter is an effective method to dealing with such kind of non-steady random signal of the heart rate. The algorithm of clipped- error LMS algorithm with variable step size of segmenting type was proposed. We adopted auto-regression predict filter estimating the noise of heart rate signals through Doppler ultrasound sensor. We used it as the reference signal of the adaptive noise cancelling system, its result is to remove some noise of main input, it made SNR raise by about 36 dB, it realized the abstraction of the heart rate signals.
Algorithms ; Echocardiography, Doppler ; Heart Rate ; physiology ; Humans ; Least-Squares Analysis ; Signal Processing, Computer-Assisted

Objective? To explore the cognition on humanistic care of nursing undergraduates in the process of early clinical experience. Methods? We selected 26 nursing undergraduates with Grade 2016 in school of nursing of Soochow University as subjects by convenience sampling. Then, we analyzed their clinical experience diary and results of symposium. Results? Students had a preliminary understanding and self-examination on humanistic care by clinical experience. A total of three themes were refined including perceived care, regurgitation-feeding other and reflection care. Conclusions? Early clinical experience could improve humanistic care of students, which is worth to be promoted and referred.