1)  frequency difference
基频差值
2)  fundamental frequency
基频
1.
An algorithm to extract the fundamental frequency and formants base on speech spectrogram;
一种基于语音频谱的基频和共振峰提取算法
2.
Approximate algorithm of fundamental frequency of pier constrained by bridge beam;
考虑桥梁约束的桥墩复合基频近似算法
3)  base frequency
基频
1.
The finite element models are adopted to analyze the influence of prestress,the prestress value in cables,the cable section and the cable layout form on base frequency and base mode of simply supported steel box girder with pres.
以预应力简支钢箱梁模型试验的测试结果为基础,应用有限元分析软件ANSYS建立了普通简支钢箱梁和预应力简支钢箱梁模型,并得到模型试验的良好验证;采用有限元法分析了预加力对普通简支钢箱梁的基频和基本振型的影响以及钢索索力大小、钢索截面面积和钢索的不同布置方式对预应力简支钢箱梁的基频和基本振型的影响。
4)  fundamental frequencies
基频
1.
In this paper a model of the equivalent linear spring is proposed for approximately calculating fundamental frequencies of a vibrating shaft with an arbitrary crack.
利用等效线弹簧模型近似计算了含裂纹转动轴的自由振动基频。
5)  pitch
基频
1.
Analysis and synthesis of continuous voice pitch contour for improving Chinese synthetic speech naturalness;
浊声基频轮廓对汉语合成自然度提高的分析与综合
2.
Research on emotional speech recognition based on pitch;
基于基频特征的情感语音识别研究
3.
Statistical Study on the Diversity of Pitch Parameters in Multilingual Speech;
多语种下情感语音基频参数变化的统计分析
6)  Basic frequency
基频
1.
Study on the basic frequency analysis of external prestressed concrete beams based on perturbation;
基于摄动法的体外预应力梁基频分析
2.
Study on the influence of basic frequency of vehicle body affected by outfit mass based on R.L. function;
基于瑞雷函数的整备质量对车体基频影响的研究
3.
With the model, the perpendicular basic frequency of different type underground gallery bridges are calculated and their empirical formula in normal condition has been obtained.
运用有限元计算模型 ,计算了各种类型地道桥的竖向基频 ,并提出正常状态地道桥竖向基频的经验表达式 ,为估算正常状态地道桥基频提供一种参考方法。
参考词条
补充资料：差值傅里叶法
分子式：
CAS号：

性质：在晶体结构分析中广泛应用的一种技巧。用它可在扣除先解析出已知原子坐标的基础上不断搜索待解析、未知原子的空间位置。设|F′c|与φ′相应为根据已知重原子或部分原子或非氢原子的坐标算得的结构因子模与位相的计算值，|FO|是结构因子模的实测值，则差值电子密度函数△ρ按下式进行计算由△ρ傅里叶级数的计算结果中可导出已知原子以外的原子坐标信息。因上式中傅里叶系数与结构因子模实测值与计算值的差值相关，故称作差值傅里叶法。

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