Abstract: There is provided a vital information processing apparatus capable of effectively reducing small-amplitude noise and isolated noise without degrading an abrupt change portion in a processing target vital signal. A vital signal detected by a vital signal detector (10) is input from a vital signal input unit (20). A sync signal extractor (25) extracts, e.g., the QRS wave form of an electrocardiogram signal of the input signal and outputs the extracted wave as a sync signal (26). A preprocessor (30) performs predetermined preprocessing for the processing target vital signal, e.g., a K sound signal and outputs the preprocessed signal to median filters (40, 45). Each of the median filters (40, 45) filters the Korotkoff sounds using the QRS signal (26) as the index value and outputs the resultant signal.

Abstract: A method for detecting a QRS complex of an ECG is provided. The method includes the steps of inputting an ECG signal, setting a first threshold value based on a peak value of a QRS complex of the ECG signal, setting a second threshold value by estimating a noise level proprotional to the amount of noise included in the ECG signal comparing the first threshold value with the second threshold value, deeming a larger one of the first and second threshold values to be a third threshold value for detecting the QRS complex, detecting the QRS complex by using the threshold value for detecting the QRS complex, and outputting a synchronous signal synchronized with the detected QRS complex.