频率计权的全数字实现
金晖;何洁
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。
【作者单位】:浙江大学城市学院 杭州310027
【关键词】:频率计权;数字信号处理
【分类号】:TM935.13
【DOI】:CNKI:SUN:YQXB.0.2006-S2-196
【正文快照】:
1引言2系统工作原理人耳对声音的感觉,不仅和声压有关,也和频率有关。一般对高频声音感觉灵敏,对低频声音感觉迟钝,声压级相同而频率不同的声音听起来可能不一样响。为了既考虑到声音的物理效应,又考虑到声音对人耳听觉的生理效应,于是在声学测量仪器中,通常根据等响度曲线,设置一定的频率计权电网络,使接收的声音按不同程度进行频率滤波,以模拟人耳的响度感觉特性。因此,频率计权在声级计中有着很重要的作用,也是一项很重要的计量指标。传统的办法是用集成运放、电阻、电容等器件来组成频率计权网络。这种方法由于采用了大量模…
Digital design method of the frequency weighting
Jin Hui He Jie (Zhejiang University City College;Hangzhou 310027;China)
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.
【Keyword】:frequency weighting digital signal processing
金晖;何洁
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。
【作者单位】:浙江大学城市学院 杭州310027
【关键词】:频率计权;数字信号处理
【分类号】:TM935.13
【DOI】:CNKI:SUN:YQXB.0.2006-S2-196
【正文快照】:
1引言2系统工作原理人耳对声音的感觉,不仅和声压有关,也和频率有关。一般对高频声音感觉灵敏,对低频声音感觉迟钝,声压级相同而频率不同的声音听起来可能不一样响。为了既考虑到声音的物理效应,又考虑到声音对人耳听觉的生理效应,于是在声学测量仪器中,通常根据等响度曲线,设置一定的频率计权电网络,使接收的声音按不同程度进行频率滤波,以模拟人耳的响度感觉特性。因此,频率计权在声级计中有着很重要的作用,也是一项很重要的计量指标。传统的办法是用集成运放、电阻、电容等器件来组成频率计权网络。这种方法由于采用了大量模…
Digital design method of the frequency weighting
Jin Hui He Jie (Zhejiang University City College;Hangzhou 310027;China)
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.
【Keyword】:frequency weighting digital signal processing