Development of high performance wireless sensor node for acoustic applications

This paper describes a design of wireless sensor network node (WSN node) for the purpose of voice based applications. For implementing voice based WSN, wireless sensor nodes should be capable of capturing voice, processing it and transmitting it over RF (Radio Frequency) channel. Common WSN applications handle few bytes of data over wireless network. Acoustic WSN applications deal with high data rate voice. Acoustic WSN applications require high performance WSN nodes to accomplish capturing and processing voice. This paper explains how to make high performance WSN nodes by incorporating Digital Signal Processing (DSP) chip with the WSN node and how to implement suitable speech processing algorithm on it. The bottle neck arisen due to usage of DSP chip on WSN node is high power consumption. The techniques which are adopted to reduce the power consumption of DSP chip are described in this paper. The design of hardware is based on ultra low power DSP chip to improve the battery operating time of the WSN node.