Some protective algorithms are discussed in this paper . most of device for fault location use single algorithm in both record star - up and the extraction of fundamental frequency component in location 分析了现有的一些保护滤波算法，改进了现有故障录波和测距装置的故障录波启动和测距基波提取采用单一算法的方法。
The key is that the tone feature is introduced to be the feature parameter . that is to say , the fundamental frequency , the derivative of fundamental frequency and its derivative are used as the feature parameters 关键技术是引入声调的特征量作为特征参数，利用基频、基频的一阶和二阶差分，作为特征参数，以提高识别率。
The classic approaches for fundamental frequencies smoothing , such as linear smoothing , median smoothing and linear interpolation , can not work well in the case of that fundamental frequency is not detected correctly and several continulus frames 传统基音的平滑方法：线性平滑、中值平滑和一般的线性插值方法都不能很好地处理连续的基音频率有随机错误点的情况。
Diode switches or voltage controlled varactors implement dual - band resonators such that they can offer low impedance at the second harmonic of each frequency band , while , in some cases , presenting high impedance at the fundamental frequency as an rf choke circuit 利用二极体开关或电压控制变容器实施双频共振器以提供在双频操作中每一个频段之二阶谐波的低阻抗，同时在一些实施例里也提供主频段的高阻抗、兼具有射频阻塞电路作用。
This way has been improved in this paper . whole - cycle fourier differential algorithm is adopted in record start - up to satisfy the real - time requirement . the least squares method is applied to extract the fundamental frequency component in location which has low computing speed but high precision 故障录波启动采用全波傅立叶差分算法，以满足启动实时性要求，测距所需基波的提取采用最小二乘法，适应其精度要求高而实时性无要求的特点。
In the thesis , a signal processing scheme of polarization - insensitive fiber optic michelson interferometric magnetic sensor is described : making the interferometer work near the quadrature with closed loop controlling working point method , the fundamental frequency component of the magnetic field sensing signals can be detected to measure the input direct current ( dc ) magnetic field by phase sensitive demodulation 本文主要介绍了偏振无关光纤michelson干涉型微弱磁场传感器信号处理的方案:通过闭环控制工作点算法使干涉仪工作在正交工作点处,再利用相敏检波算法提取传感器输出信号的基频分量,以测量直流磁场的大小。
Under these assumptions , three kinds of excitations , namely , harmonic force with frequency equal to the structural fundamental frequency , harmonic force with frequency equal to half of the structural fundamental frequency and pulse force are inputted to the undamaged and damaged structures . then under the same excitation , the undamaged structural displacement responses , velocity responses , acceleration responses , jerk responses and responses of integrated displacement are compared with that of the damaged ones 在此假定基础上,分别将激励频率等于结构基频的简谐形激励、激励频率等于结构基频之半的简谐形激励和锤击激励输入结构,而后比较了损伤前后结构在相同激励下的位移响应、速度响应、加速度响应、加加速度响应和位移积分响应。
A method of pitch mark determination for a speech , includes : acquiring a fundamental frequency point and fundamental frequency passband signals by using an adaptable filter ; detecting a number of passing zero positions of the fundamental frequency passband signals ; and generating at least a set of pitch marks from a number of passing zero positions 一种决定语音音高标记的方法，系藉以找出一语音之一组音高标记，此决定语音音高标记的方法系利用一可适性滤波器取得一基频点与一基频带通讯号；求取基频带通讯号之复数个过零点位置；然后经由复数个过零点位置产生至少一组音高标记。
Three kinds of excitations , namely , harmonic force with frequency equal to the structural fundamental frequency , harmonic force with frequency equal to half of the structural fundamental frequency and pulse force are applied to such four kinds of models . the displacement responses of the four kinds of models are calculated using sap2000 and the integrations of displacement responses are obtained by numerical calculations 将三种激励形式:激励频率等于结构基频的简谐形激励、激励频率等于结构基频之半的简谐形激励和锤击激励分别施加在这四种模型上,通过计算得到四种模型的位移响应,进而得到位移积分响应。
At present , the infrared transmission spectroscopy is the best technique for determining whether jadeite is polymer - impregnated or not , and the infrared reflectance spectroscopy is a nondestructive and rapid determination method that provides mainly the fundamental frequency vibration spectra data of minerals and shows new application potentials in gemological research , especially in the identification of gem species 摘要红外透过光谱技术是当前鉴别翡翠是否有聚合物充填的最好方法，而红外反射光谱技术是一种快速、无损伤的测试方法，主要提供矿物的基频振动光谱信息，在宝石学研究方面特别是鉴定宝石种属方面显示出新的应用可能性。
