仪表技术与传感器
儀錶技術與傳感器
의표기술여전감기
INSTRUMENT TECHNIQUE AND SENSOR
2015年
5期
62-64
,共3页
次声信号%数据采集%过采样%自动增益调节
次聲信號%數據採集%過採樣%自動增益調節
차성신호%수거채집%과채양%자동증익조절
infrasound signal%data collection%over-sampling%dynamic gain adjustment
次声电信号的检测要求系统具有极高的分辨率、宽动态范围以及强噪声抑制能力。该系统为了提高现有模数转换器检测次声信号的能力，简化系统电路和降低生产成本，通过过采样来提高ADC的分辨率，实现了对原始次声信号高精度的采集；同时为了避免微弱次声信号幅值太小而导致的过采样失效，该系统增加了根据输入电平变化动态改变增益的功能。文中结合微控制器的特性，给出了具体的实现方法，并对其进行了测试。实验表明，该系统较传统次声信号数据采集系统具有更高的精度，满足了目前对于次声信号研究的需要。
次聲電信號的檢測要求繫統具有極高的分辨率、寬動態範圍以及彊譟聲抑製能力。該繫統為瞭提高現有模數轉換器檢測次聲信號的能力，簡化繫統電路和降低生產成本，通過過採樣來提高ADC的分辨率，實現瞭對原始次聲信號高精度的採集；同時為瞭避免微弱次聲信號幅值太小而導緻的過採樣失效，該繫統增加瞭根據輸入電平變化動態改變增益的功能。文中結閤微控製器的特性，給齣瞭具體的實現方法，併對其進行瞭測試。實驗錶明，該繫統較傳統次聲信號數據採集繫統具有更高的精度，滿足瞭目前對于次聲信號研究的需要。
차성전신호적검측요구계통구유겁고적분변솔、관동태범위이급강조성억제능력。해계통위료제고현유모수전환기검측차성신호적능력，간화계통전로화강저생산성본，통과과채양래제고ADC적분변솔，실현료대원시차성신호고정도적채집；동시위료피면미약차성신호폭치태소이도치적과채양실효，해계통증가료근거수입전평변화동태개변증익적공능。문중결합미공제기적특성，급출료구체적실현방법，병대기진행료측시。실험표명，해계통교전통차성신호수거채집계통구유경고적정도，만족료목전대우차성신호연구적수요。
The infrasound signals detecting system has ultra-high resolution,wide input dynamic range and strong noise rejec-tion abilities In order to improve the ability of existing ADCs to detect infrasound signal,simplify the circuit of system and reduce the cost,over-sampling technique was applied to increase ADC's resolution.By this way,the acquired signals are more similar to the original infrasound signals.And to realize weak signal detection by using over-sampling,the system's PGA gain can be dynamically set based on the amplitude of the input signal.Based on the specific characteristic of the micro controller,the concrete software is provided and tested.Experimental results show that the method of acquiring signals using over-sampling technique can reserve more details than the method of directly acquiring signals,and the system is adaptable to satisfy the research demand of infrasound.
