An Adaptive Single Frequency Phase Vocoder for Low-power Heart Rate Detection - Development of a Fast and Low-power Heart Rate Estimation Algorithm for Mobile Phone Applications

W. Karlen, G. Dumont, C. Petersen, J. Gow, J. Ansermino
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引用次数: 2

Abstract

Mobile phones can be used as a platform for clinical decision making in resource-poor and remote areas. Their limited battery and computational resources, however, demand ef?cient and low-power algorithms. We present a new algorithm for the fast and economical estimation of heart rate (HR) from the photoplethysmogram (PPG) recorded with a pulse oximeter connected to a mobile phone. The new method estimates the HR frequency by adaptively modeling the PPG wave with a sine function using a modi?ed phase vocoder. The obtained wave is also used as an envelope for the detection of peaks in the PPG signal. HR is computed using the vocoder center frequency and using the peak intervals in a histogram. Experiments on a mobile device show comparable speed performance with other time domain algorithms. Preliminary tests show that the HR computed from the vocoder center frequency is robust to noisy PPG. The instantaneous HR calculated with the vocoder peak detection method was more sensitive to short-term HR variations. These results point to further developments using a combination of both HR estimation methods that will enable the robust implementation of adaptive phase vocoders into mobile phone applications.
一种用于低功耗心率检测的自适应单频相位声码器——一种用于手机应用的快速低功耗心率估计算法的开发
在资源贫乏和偏远地区,手机可以作为临床决策的平台。然而,它们有限的电池和计算资源需要多少?客户端和低功耗算法。我们提出了一种新的算法,用于快速和经济地估计心率(HR)从光电容积图(PPG)记录的脉搏血氧计连接到移动电话。该方法通过对PPG波进行正弦函数自适应建模来估计HR频率。Ed相位声码器。得到的波也用作包络线,用于检测PPG信号中的峰值。HR是使用声码器中心频率和直方图中的峰值间隔来计算的。在移动设备上的实验表明,与其他时域算法的速度性能相当。初步测试表明,由声码器中心频率计算的HR对有噪声的PPG具有较好的鲁棒性。用声码器峰值检测方法计算的瞬时HR对短期HR变化更为敏感。这些结果指出了进一步的发展,使用两种HR估计方法的组合,将使自适应相位声码器在移动电话应用程序中的鲁棒实现。
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