Extraction of novel features for emotion recognition

Hilbert-Huang transform method has been widely utilized from its inception because of the superiority in varieties of areas. The Hilbert spectrum thus obtained is able to reflect the distribution of the signal energy in a number of scales accurately. In this paper, a novel feature called ECC is proposed via feature extraction of the Hilbert energy spectrum which describes the distribution of the instantaneous energy. The experimental results conspicuously demonstrate that ECC outperforms the traditional short-term average energy. Combination of the ECC with mel frequency cepstral coefficients (MFCC) delineates the distribution of energy in the time domain and frequency domain, and the features of this group achieve a better recognition effect compared with the feature combination of the short-term average energy, pitch and MFCC. Afterwards, further improvements of ECC are developed. TECC is gained by combining ECC with the teager energy operator, and EFCC is obtained by introducing the instantaneous frequency to the energy. In the experiments, seven status of emotion are selected to be recognized and the highest recognition rate 83.57% is achieved within the classification accuracy of boredom reaching 100%. The numerical results indicate that the proposed features ECC, TECC and EFCC can improve the performance of speech emotion recognition substantially.     

自然数幂和通项公式证明的新方法

针对自然数幂和问题,利用多项式和矩阵理论,得到了一种计算自然数幂和通项公式的方法,给出了该方法的具体推导过程．此方法的优点是将自然数幂和问题转换为了线性方程组求解问题,更浅显易懂．     

有限超可解群的幂零剩余

本文讨论子有限超可解群的幂零剩余，证明其为Hall子群。     

科罗拉多大峡谷

科罗拉多大峡谷位于美国亚利桑那州(Arizona)西北部,科罗拉多高原西南部。大峡谷全长446千米,平均宽度16千米,最深处1829米,平均深度超过1500米,总面积2724平方千米。1919年,威尔逊总统将大峡谷地区辟为”大峡谷国家公园”。大峡谷是科罗拉多河的杰作。在大峡谷中,有75种哺乳动物、50种两栖和爬行动物、25种鱼类和超过300种的鸟类生     

简析W=I~2Rt中的I

本文通过对一例题的剖析，指出当电流随时间变化时，电功公式W＝I2Rt中的I应是电流的有效值而不是平均值。     

约瑟夫逊结中的噪声电压

讨论了约瑟夫逊结中噪声驱动下电流的线性响应，理论表结果表明：随着噪声自关联时间τ的增大，平均归一化电压 减小，热涨落参量越大，平均归一化电压减少越缓慢，就电流的线性响应而言，白噪声与O－U噪声作用正相反。     

关于酉Euler函数的Subbarao猜想

对于正整数n，设ψ^*(n)是酉Euler函数．本文证明了：当n是幂数时，如果n=1(mod ψ^*(n))，则n必为素数方幂．     

竞赛常用知识手册

5不等式 5．1平均不等式 （1）调和平均、几何平均、算术平均和平方平均的关系．记 Hn=n/1/a1＋1/a^2＋…＋1/an,     

求变力做功的若干方法

一、图象法求变力功 例1 某个力与位移关系图线如下图所示，求该力的功，（已知该力与位移同向）