摘要
Abstract
When collecting multi-channel digital audio signals,each channel requires an independent analog-to-digital converter and signal processing circuit,which increases the power consumption of hardware.On this basis,a method of multi-channel digital audio signal low-power consumption collection based on compressive sensing is proposed.In this method,a multi-channel digital audio signal acquisition device is designed mainly,which receives differential voltage signals,amplifies them by means of the operational amplifier of the multi-channel audio signal conditioning unit,and transmits them to the multi-channel digital signal acquisition unit using a low-power consumption successive approximation register analog-to-digital converter(SAR ADC),which converts it into a digital audio signal.A multi-channel digital audio signal parallel compression sensing model is designed to compress the multi-channel digital audio signals,and then transmit them to the central control unit.The signal is packaged by an Ethernet chip and uploaded to the upper computer.In the upper computer,the inverse compression sensing algorithm in the parallel compression sensing model of multiple digital audio signals is used to recover the received compressed signal into a high-quality original audio signal,so as to realize the low-power consumption signal collecti on based on low sampling rate.The results verify that the power consumption can maintains low level with an average of only 0.42 mW when collecting multiple music digital audio signals,and has lower power consumption compared with other methods.关键词
多路数字音频信号/低功耗采集/压缩感知理论/模数转换器/采样保持电路/信号压缩/信号恢复Key words
multi-channel digital audio signal/low-power consumption collection/compressed sensing theory/analog-to-digital converter/sample-and-hold circuit/signal compression/signal recovery分类
信息技术与安全科学
