| 摘要 |
<p>PROBLEM TO BE SOLVED: To remove the noise content when noise caused by a body movement is superimposed on a periodically generating signal such as a Korotkoff sound. SOLUTION: A short-time self-correlation function of an input signal is calculated, and a period of the input signal is obtained (ST52). A random noise component is removed (ST53). Next, the short-time self-correlation function and a mutual correlation function of the input signal are calculated, and a phase of the obtained period is determined (ST54). A desired signal (the Korotkoff sound) is obtained from the input signal by the obtained period and phase information (ST55).</p> |
