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900m~3混響室及其聲源的聲學(xué)特性的工程研究

Acoustic characteristics of the 900 m3 reverberation chamber and its sound sources

  • 摘要: 文章對900 m3混響室及其聲源的聲學(xué)特性進(jìn)行了實(shí)驗(yàn)研究,并用工程方法測試計算了混響時間、聲功率以及聲源的頻率特性,對一些實(shí)驗(yàn)結(jié)果進(jìn)行了探討。根據(jù)聲壓級的衰變量與時間的線性關(guān)系,利用突然斷開聲源的方法計算了混響時間,并由混響時間討論了參考聲源功率譜下混響室譜成形能力問題。分別以混響室法和近似行波場法測算了聲功率,指出兩種方法的區(qū)別與聯(lián)系。利用近似行波場法,以白噪聲信號驅(qū)動音頭評估了其頻率特性。通過實(shí)驗(yàn)數(shù)據(jù)分別探討了混響室統(tǒng)計頻率與號筒聲損耗問題,提出“統(tǒng)計頻率下限”與號筒聲損耗的估算方法。該項工作還有待深入研究。

     

    Abstract: Acoustic characteristics of the 900 m3 reverberation chamber and its sound sources are studied by experiment. The reverberation time, the acoustic power and the frequency characteristics of sound sources are measured and calculated, and the experimental results are analyzed. The reverberation time is calculated by suddenly cutting off the source according to the linear relation between the decrement of SPL and time. The spectrum shaping ability of the reverberation chamber under the reference sound source's power spectrum is also discussed with respect to the reverberation time. The acoustic power is measured by the method of reverberation chamber and the method of approximate travelling wave field, respectively. The difference and the relation between the two methods are pointed out. The frequency characteristics of the acoustic generator driven by the white noise signal are evaluated by the method of the approximate travelling wave field. The reverberation chamber statistical frequency and the horn's acoustic loss are analyzed according to the experimental data, and the evaluation methods for the statistical frequency lower limit and the horn's acoustic loss are proposed.

     

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