基于基频的梅尔倒谱系数在车辆识别中的应用

来源 :重庆大学学报 | 被引量 : 0次 | 上传用户:mnwang2008
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
用传统的梅尔倒谱系数作为特征进行车辆识别时,识别效果易受噪声干扰.为增强特征鲁棒性,提出一种加权的基频自适应梅尔倒谱系数特征提取算法.首先用能熵比法对车辆声音信号进行端点检测;然后提取车辆信号的基频,自适应构建三角滤波器组,提高滤波器对基频的感知敏感度;最后对基频自适应梅尔倒谱系数进行F比加权.实验结果表明,与传统梅尔倒谱系数相比,在识别车辆时,加权的基频自适应梅尔倒谱系数识别准确率提高7.10%,虚警率降低3.93%,漏警率降低7.10%.
其他文献
In recent years,the hydrogel-based tissue adhesives have been extensively investigated for their excellent biocompatibility and the ability to be administered directly within the adherent tissue.To meet the requirement for more controllable release in var
1,2-Dioxetane is a well-known chemiluminescent mechanophore allowing real-time monitoring of polymer chain scission,but usually suffers from fluorescence quenching in polar environments.Herein,a series of mechanochemiluminescent waterborne polyurethanes/c
In all-polymer solar cells (APSCs),number-average molecular weights (Mns) of polymer donors and polymer acceptors play an important role in active layer morphology and photovoltaic performance.In this work,based on a series of APSCs with power conversion
Introducing small molecule-bridged hydrogen bonds (HBs) between polymer chains has been reported to effectively reduce the inter-chain cooperativity despite of strengthening the intermolecular interaction.Here,a systematic investigation on tuning the Joha
The flexibility of organic photovoltaics (OPVs) has attracted worldwide attention in recent years.To realize the bending-stability of OPVs,it is necessary to put forward the bending-stability of interracial layer.A novel bendable composite is explored and
We propose a unified thermodynamic model of flow-induced crystallization of polymer (uFIC),which incorporates not only the conformational entropy reduction but also the contributions of flow-induced chain orientation,the interaction of ordered segments,an
音乐是提高学生审美和综合素质的学科,随着社会对传统文化的重视程度不断提高,在小学音乐教学中传承民族音乐文化的呼n声也越来越高。本文针对在小学音乐教学中传承民族音乐出现的问题进行分析,并提出适合的教学策略,提高教学的有效性,以期实现对传n统民族音乐文化的传承。
Stereocomplex-type polylactide (SC-PLA) consisting of alternatively arranged poly(L-lactide) (PLLA) and poly(D-lactide) (PDLA) chains has gained a good reputation as a sustainable engineering plastic with outstanding heat resistance and durability,however
Herein,isotactic polypropylene films with small β-nucleating agent content were fabricated via a melt-extrusion-stretched technology with intended “shear-free” in barrel and die.Compared with neat films,the tensile strength,elongation at break and strain
We performed dynamic Monte Carlo simulations of stress relaxation in parallel-aligned and uniaxially stretched bulk amorphous polymers at low temperatures.We observed an extra-slowing down in the early stage of stress relaxation,which causes nonlinear vis