【摘要】 过零检测器可以通过预报功率谱形状的变化来发现环境噪声中新出现的运动声源,研究了过零检测器的检测性能。根据奈曼-皮尔逊(Neyman-Pearson,NP)准则得出了接收机工作特性(ROC)曲线,分析了最佳检测效果与前置滤波器频带的关系,并比较了过零检测与能量检测、功率谱线谱检测的性能。实测数据的计算机仿真表明,过零检测器不仅能耗很低,且在非高斯噪声背景中性能稳健,具有实用价值。更多还原

【Abstract】 Zero-crossing detector is capable of predicting the shape changes of power spectrum so as to find the newly emerged moving sound sources in ambient noise. The performance of zero-crossing detector in terms of receiver operating characteristics (ROC) was derived based on the Neyman-Pearson criterion, and the relationship between optimal performance and pre-filtering frequency band was analyzed. The performance was also compared with the ROC of energy detector and power spectrum detector. Theoretical analysis and simulations on data measured at sea show that zero-crossing detector has not only low average energy cost, but also has robust performance in non-Gaussian noise.更多还原