Acoustic signal communication can be used for wireless sensor networks（ WSNs）

which do not take up radio communication frequency bandwidth and no RF interference

it has a wide application prospect in areas such as environmental monitoring

military detection and other fields. Research a WSNs node system which based on PSK modulated acoustic communication. Node system uses ARM + FPGA structure

core controller is a STM32 ARM chip which has low power consumption sleep mode

FPGA is used for data caching and partial data processing

PZT-type speaker is used to achieve acoustic signal transceiver. Tests show that node system can carry out data communication within 10 m

data rate is 300 bps

bit error rate（ BER） is less than 10- 3

maximum power consumption of system is less than 0. 1 W

lowest sleep power consumption is less than 10 μW.