求翻译：本文介绍的设计方法原理简单易懂，成本低廉，整个系统耗电低，体积小，并且经过系统的信号调理电路后，能比较准确地测量人体的脉搏，同时本设计存在一定的误差，误差范围在4%-9%之间。是什么意思？

This article describes the design principle of the method is simple, low cost, low power consumption of the entire system, small size, and after a signal conditioning circuit of the system can accurately measure the pulse of the human body, this design there is a certain error, the error range betwe

This document describes how the simple, easy-to-learn methods for the design, low-cost, low power consumption throughout the system, small, and go through the system's signal conditioner circuit, can be more accurately measured pulse of the body, and this design has a certain error, the error in the

This article introduced design method principle simple easy to understand, the cost is inexpensive, the overall system consumes the electricity to be low, the volume is small, after and the process system signal recuperation electric circuit, can survey the human body quite accurately the pulse, sim

Design methodology that is described in this article simple, low cost, low power consumption of the system as a whole, small size, and after system signal conditioning circuits, can more accurately measure the body's pulse, at the same time the design there is a error, error ranges between in-4%.

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