聲學(xué)試驗三分之一倍頻程控制技術(shù)研究

Research on 1/3 octave acoustic test control technique

摘要: 以往的聲學(xué)試驗中多采用倍頻程控制方法，該方法控制精度比較低，已不能滿足現(xiàn)在試驗標(biāo)準(zhǔn)要求。文章詳細(xì)介紹了聲學(xué)試驗控制系統(tǒng)的基本原理及組成，并對控制算法進(jìn)行了探討和研究，通過改進(jìn)譜估計算法和均衡算法等提高系統(tǒng)的控制精度和穩(wěn)定性，并采用VC++編程開發(fā)了1/3 倍頻程噪聲試驗控制系統(tǒng)。新控制系統(tǒng)與混響室進(jìn)行了聯(lián)合調(diào)試，調(diào)試結(jié)果表明新控制系統(tǒng)的控制精度滿足相關(guān)標(biāo)準(zhǔn)的要求。

Abstract: In the past, OCT control method was usually used in acoustic tests, but its control precision is low and can not meet the demands of the new test criteria. This paper discusses the principles and the main components of an acoustic test control system especially its control algorithms. By modifying the power spectrum estimation algorithm and the equalization algorithm, the precision and stability of the system can be improved. 1/3 octave acoustic test control system is built in the VC++ environment. The new control system was tested in a reverberation chamber and the results indicate that the control precision can satisfy related requirements of standards.