CAJ | 학술논문

结合嵌入式系统平台的特点，分析了基于卷积的全数字频率计权实现方法。为解决随着滤波精度提高，滤波器系数增长，运算量急剧增大的问题，提出了基于重叠相加DFT的优化方案，并对实现过程进行理论分析。对两种方案的运算量级进行讨论。在MATLAB中对优化方案进行仿真分析，并在嵌入式系统平台上进行实验验证。理论推导和实验结果表明：基于卷积和基于重叠相加DFT的方案的结果是一致的，而且随着滤波器系数的增大后者性能快速提升，并获得在滤波器系数已知和滤波器系数，一帧大小都已知的情况下的方案和参数选择原则。
결합감입식계통평태적특점，분석료기우권적적전수자빈솔계권실현방법。위해결수착려파정도제고，려파기계수증장，운산량급극증대적문제，제출료기우중첩상가DFT적우화방안，병대실현과정진행이론분석。대량충방안적운산량급진행토론。재MATLAB중대우화방안진행방진분석，병재감입식계통평태상진행실험험증。이론추도화실험결과표명：기우권적화기우중첩상가DFT적방안적결과시일치적，이차수착려파기계수적증대후자성능쾌속제승，병획득재려파기계수이지화려파기계수，일정대소도이지적정황하적방안화삼수선택원칙。
After taking the characteristic of an embedded system into consideration,a traditional method based on a convolution for digital frequency weighting was analyzed.In order to meet the requirements of high precision and long filter coefficient,the calculation amount increased dramatically,an optimization scheme based on overlapping and adding DFT was presented.Its realization process was analyzed theoretically.The total compatation amount of both schemes were compared and discussed.The optimization scheme was simulated with MATLAB and tested on a platform of an embedded system.The results showed that both two methods can be used to get the same results;the method based on overlapping and adding DFT has a better performance as the filter coefficient becomes longer;the selection principle of schemes and parameters is acquired when both the filter coefficient and the length of a frame are known.