无线传感器网络节点的优劣直接关系到无线传感器网络的生存周期及其传递数据的可靠性，考虑到无线传感网络节点对外界信息感知的要求，设计了一种带通滤波的声音信号采集电路。声信号经模电转换后，滤波、偏置、放大、跟随和A/D转换，将模拟电信号转换为数字信号。测试结果表明，信号转换过程中对通频带中的信号有良好的传递特性，保证不失真和相位偏差最小且稳定，对通频带外信号的抑制效果很明显。%The pros and cons of the wireless sensor network ( WSN) nodes is directly related to the life cycle of WSN, and its reliability for transferring data. Considering the demands for information perception outside world of WSN, the sound signal acquisition circuit with band pass filtering is designed. The analog signal is converted into digital signals through filtering, biasing, amplifying, following and A/D converting. The results of test indicate that in signal converting process, the signals in pass band possesses excellent transfer characteristics, no distortion and minimum phase deviation are guaranteed, while the signals outside pass band are eliminated obviously.
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