华南理工大学学报(自然科学版)
華南理工大學學報(自然科學版)
화남리공대학학보(자연과학판)
JOURNAL OF SOUTH CHINA UNIVERSITY OF TECHNOLOGY(NATURAL SCIENCE EDITION)
2015年
4期
126-132,137
,共8页
刘昱%谢菠荪%麦海明%陈嘉衍
劉昱%謝菠蓀%麥海明%陳嘉衍
류욱%사파손%맥해명%진가연
球形传声器阵列%脉冲响应测量%非线性失真%最大长度序列%正弦对数扫频
毬形傳聲器陣列%脈遲響應測量%非線性失真%最大長度序列%正絃對數掃頻
구형전성기진렬%맥충향응측량%비선성실진%최대장도서렬%정현대수소빈
spherical microphone array%impulse response measurement%nonlinear distortion%maximum length se-quence%logarithmic sine sweep
在球形传声器阵列的脉冲响应测量中,其几何结构对入射声波产生散射作用,使各传声器检拾信号中声源非线性失真的谐波比例发生变化。文中选取以最大长度序列以及正弦对数扫频为激励声源的两种脉冲响应测量方法,通过仿真和实际测量评估非线性失真对其测量结果的影响。仿真和测量结果表明,由于声波在球面散射的作用,谐波成分将随入射声波角度而产生变化;声源谐波失真阵列背对声源的传声器对输出影响较小,而面对声源的传声器对输出影响较大;总体上最大长度序列测量法对声源的非线性失真更为敏感,对数扫频方法更适于球形传声器阵列的脉冲响应测量。
在毬形傳聲器陣列的脈遲響應測量中,其幾何結構對入射聲波產生散射作用,使各傳聲器檢拾信號中聲源非線性失真的諧波比例髮生變化。文中選取以最大長度序列以及正絃對數掃頻為激勵聲源的兩種脈遲響應測量方法,通過倣真和實際測量評估非線性失真對其測量結果的影響。倣真和測量結果錶明,由于聲波在毬麵散射的作用,諧波成分將隨入射聲波角度而產生變化;聲源諧波失真陣列揹對聲源的傳聲器對輸齣影響較小,而麵對聲源的傳聲器對輸齣影響較大;總體上最大長度序列測量法對聲源的非線性失真更為敏感,對數掃頻方法更適于毬形傳聲器陣列的脈遲響應測量。
재구형전성기진렬적맥충향응측량중,기궤하결구대입사성파산생산사작용,사각전성기검습신호중성원비선성실진적해파비례발생변화。문중선취이최대장도서렬이급정현대수소빈위격려성원적량충맥충향응측량방법,통과방진화실제측량평고비선성실진대기측량결과적영향。방진화측량결과표명,유우성파재구면산사적작용,해파성분장수입사성파각도이산생변화;성원해파실진진렬배대성원적전성기대수출영향교소,이면대성원적전성기대수출영향교대;총체상최대장도서렬측량법대성원적비선성실진경위민감,대수소빈방법경괄우구형전성기진렬적맥충향응측량。
During the impulse response measurement of spherical microphone arrays, the scattering of the incident sound wave caused by the array geometry may change the harmonic proportion of signals recorded by the microphone. In this paper, two methods, one using the maximum length sequence and the other using the logarithmic sine sweep as the excitation source, were adopted to measure the impulse response, and the effect of nonlinear distortion on the measured results was analyzed.Moreover, a simulation was carried out for comparison.Simulated and measured re-sults indicate that (1) the proportion of harmonic distortion varies with the incident angle of sound source due to the scattering of incident sound wave on the spherical surface;(2) the microphone with a harmonic distortion array back onto the sound source slightly affects the output, while the microphone with a harmonic distortion array facing to the sound source greatly affects the output;and (3) in general, the measurement method based on the maximum length sequence is more sensitive to the nonlinear distortion of sound sources while the method based on the logarithmic sine sweep is more suitable for the impulse response measurement of spherical microphone arrays.