observation n. 1.观察,注意;观察力;?望。 2.观测,实测;【航海】测天;【军事】观测,监视,侦察。 3.(观察得的)知识,经验;〔pl.〕观察[观测]报告[资料]。 4.经验谈,讲话,谈话;评述,按语,短评,意见 (on)。 5.〔口语〕发言,言论。 a man of no observation 没有观察力的人。 an expedition of observation 观察队。 sampling observation 抽查。 service observation 业务检查。 a witty [foolish] observation 聪明[糊涂]话。 come [fall] under one's observation 看见,瞧见。 keep a suspect [patient] under observation 监视[观察]一个可疑的人[病人]。 make a few observations on 简单谈谈对…的几点看法。 take an observation 【航海】测天。
difference n. 1.差异,差别。 2.不和,争论。 3.【数学】差,差额。 4.【逻辑学】特殊性。 There is no difference between them. 两者毫无差别。 the difference of jetsam from flotsam 弃货不同于浮货。 What difference can it make 不是一样吗? He is an artist with a difference. 他是别具风格的艺术家。 distinction without difference 无聊的区别。 make a difference 发生差别;使…有差别;(结果等)是重要的,有关系[影响] (One false step will make a great difference. 失之毫厘,谬以千里。 Don't let it make any difference. 没关系。 make a difference between A and B 使甲乙有别,对甲乙不一样)。 pay [meet] the difference 付差额金。 seek common ground while reserving differences 求同存异。 settle differences 调停。 split the difference 1. 折中,妥协。 2. 均分剩下的东西。 vt. 〔罕用语〕区别,使有差别。
The difference of base function cause the difference of observation angle and observation method for signal , this is the essence of wavelet transfer differentiate fourier transfer f short - time fourier transfer , comparing performance and characteristic of various wavelet base functions in common use in fault diagnosis and studying inner connection of different fault diagnosis signal and various wavelet base functions , it is pointed out that genuine optimum wavelet transfer is that signal decompose of base function should be most close to and be most suited to signal feature 基函数的不同导致对信号观测角度和观测方法的不同,这是fourier变换、短时fourier变换和小波变换的本质区别。通过比较故障诊断中常用的各种小波基函数的性能和特点,研究不同的故障信号特征与各种小波基函数的内在联系,指出真正的最优小波变换应该是根据信号特征与其最近似、最匹配的基函数的信号分解。