【摘要】 本文在讨论了人体动脉脉搏波频域特点以及声卡技术特征的基础上,提出用声卡采集动脉脉搏波的一种方法。利用线性调幅的方法,可以将脉搏信号的频谱移动到声卡所能采集的范围内,通过声卡采集后,在数字域中进行调幅信号的解调,从而恢复脉搏信号;同时还讨论了普通调幅波的一种实现方法及数字调幅波的解调原理。更多还原

【Abstract】 Based on the analysis of the characteristic in the frequency domain of the pulse wave and the technical property of the sound card,A method about sampling the pulse wave by use of a sound card is put forward.In order to sampling the pulse wave,the spectrum of the pulse signal is moved into the limits of the sound card by amplitude modulation.After sampling by the sound card,the AM signal is demodulated in the digital domain and the pulse signal is recovered.A method about achiev-ing amplitude modulation and a method about demodulating the digital AM signal are studied in this paper.更多还原