CAJ | 학술논문

常规声级计测量到的是目标声和环境噪声的总声压，不具备抑制环境噪声的功能。为此使用以球面波函数叠加逼近理论为基础的声波分离方法，用以提升环境噪声中简单声源声压级的测量精度。该方法以小型传声器阵列探头作为测量前端，近场声全息和声波分离为核心计算方法进行实施。为验证该方法的有效性，在全消声室内对关键参数进行了实验验证。实验结果表明，该方法在500 Hz~2750 Hz频带内，且探头距目标声源5 cm~12 cm的近场区域，可以在环境噪声中得到较精确的目标声源的声压级。
상규성급계측량도적시목표성화배경조성적총성압，불구비억제배경조성적공능。위차사용이구면파함수첩가핍근이론위기출적성파분리방법，용이제승배경조성중간단성원성압급적측량정도。해방법이소형전성기진렬탐두작위측량전단，근장성전식화성파분리위핵심계산방법진행실시。위험증해방법적유효성，재전소성실내대관건삼수진행료실험험증。실험결과표명，해방법재500 Hz~2750 Hz빈대내，차탐두거목표성원5 cm~12 cm적근장구역，가이재배경조성중득도교정학적목표성원적성압급。
Generally, conventional sound-level meters can only measure the total sound pressure of the target sound source and the environment noise instead of measuring them separately. To improve the measurement accuracy of the sound pressure level of the target sound source in noisy environment, the acoustic wave separation method based on spherical wave su-perposition was used with the input of the acoustic pressures measured by a mini-sized microphone array. The impact of param-eters on the accuracy of the sound pressure level was examined in an anechoic chamber. The results show that a reasonable ac-curacy can be obtained when the frequency is ranged from 500 Hz to 2 750 Hz and the measurement distance is from 5 cm to 12 cm.