【摘要】：針對(duì)空間聲信號(hào)處理中二維聲場(chǎng)合成與實(shí)際聲源維數(shù)失配問(wèn)題及近場(chǎng)聲源合成中的近場(chǎng)失真問(wèn)題,本文提出了一種2.5維聲場(chǎng)合成方法和一種改進(jìn)的維納濾波的近場(chǎng)補(bǔ)償方法.2.5維聲場(chǎng)合成基于高階Ambisonics的球諧函數(shù)展開.改進(jìn)的維納濾波方法用于補(bǔ)償高階Ambisonics合成2.5維近場(chǎng)聲源時(shí)引入的近場(chǎng)失真.基于連續(xù)揚(yáng)聲器陣列假設(shè)理論,推導(dǎo)出了揚(yáng)聲器激勵(lì)信號(hào)的一般表達(dá)形式.聲場(chǎng)合成實(shí)驗(yàn)結(jié)果表明:與余弦正則化方法產(chǎn)生的相對(duì)誤差0.23相比,所提方法合成2.5維近場(chǎng)聲源的相對(duì)誤差減少到了0.031;與高通濾波法相比,所提方法可以提供更大范圍的有效聽音區(qū).
[Abstract]:Aiming at the problem of two-dimensional sound field synthesis and actual sound source dimension mismatch in spatial acoustic signal processing, and the near-field distortion problem in near-field sound source synthesis, In this paper, we propose a 2.5-D sound field synthesis method and an improved near-field compensation method for Wiener filter .2.5-D sound field synthesis based on the spherical harmonic function expansion of high-order Ambisonics. The improved Wiener filtering method is used to compensate the near-field distortion introduced in the synthesis of 2.5-D near-field sound sources by high-order Ambisonics. Based on the hypothesis theory of continuous loudspeaker array, the general expression of loudspeaker excitation signal is derived. The experimental results of sound field synthesis show that compared with the relative error of cosine regularization method 0.23, the relative error of the proposed method for the synthesis of 2.5 dimensional near-field sound sources is reduced to 0.031, and compared with the high-pass filtering method, the proposed method reduces the relative error of the proposed method to 0.031. The proposed method can provide a wider range of effective listening areas.
【作者單位】： 北京工業(yè)大學(xué)電子信息與控制工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(No.61231015,No.61201197) 教育部博士點(diǎn)新教師基金(No.20121103120017) 北京市教委科技計(jì)劃(No.KM201310005008)
【分類號(hào)】：TN912.3;TN643

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1 查夢(mèng)芳;基于Ambisonics的多區(qū)域聲場(chǎng)重放方法研究[D];北京工業(yè)大學(xué);2016年

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本文編號(hào)：2223090