摘要
分析了传统声级计中频率计权线路设计的缺陷,原有的设计方法:用集成运放、电阻、电容等器件来组成频率计权网络,其缺陷在于:这种方法由于采用了大量模拟器件,稳定性、可靠性、性能指标很难做的很好,调试很不方便。本文提出了一种在噪声测量中使用的频率计权通过数字实现的方法,包括FFT法和数字滤波法。论文详细阐述了噪声测量中使用的频率计权通过数字实现方法的具体内容。结果表明了该方法在实际应用中具有简化电路结构、精度高、性能稳定、无需调试等优点。
The traditional design of frequency weighting uses operational amplifiers, resistance、capacitance and other devices to comprise the frequency weighting network. As adopting lots of analog devices, the traditional design achieves low reliability、low stability and inconvenient adjustment. Based on the analysis of the limitations of the traditional frequency weighting design for the noise measurement, a new digital frequency weighting method was introduced. The paper described the digital method in details. The result shows that the new digital design method has greatly simplified the circuit、high precision、good stability and need no adjustment.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2006年第z2期1495-1496,1499,共3页
Chinese Journal of Scientific Instrument
关键词
频率计权
数字信号处理
frequency weighting digital signal processing
