傅利叶变换 meaning in English
fourier transform
Examples
- A new method for person ' s face identifying by one - dimensional fourier transformation
基于傅利叶变换的人脸识别改进方法 - Besides , digital signal processing technology in ac contactors electric life test is studied in this paper . under the principles of digital signal processing , using fft , the calculate process of power supply frequency and power factor is discussed
此外，本文研究了交流接触器电寿命试验中数据处理技术，应用数字信号处理理论，利用傅利叶变换，分析了电源频率、功率因数的计算过程。 - In this thesis , summarized the basic theories of fourier transformation and the fast fourier transformation that are generally adopted to detect and analyze the electric power harmonic in the electric power supply system . at the same time , summarized the even sample principle , the phenomenon of frequency mix , the window functions and the frequency leaking as so on , those are closely - related to sample from figure signal
简要阐述了电力系统谐波检测分析所普遍采用的傅利叶变换和快速傅利叶变换的基本理论以及与数字信号采样密切相关的均匀抽样定理、频谱混叠现象、窗函数和频谱泄漏等的基本理论。 - As to the video signal , alarm signal , control signal , are all weak electricity signal , exceedingly easily be subjected to the jam , in case the power supply system does not steady , wave propag ation is greatly , the harmonic content of power source overtops , the veins wave factors are great unduly , and even power source equipment breakdown , outputting abnormal , will be about to affect the video signal image effect , and dependability cuts downs to the security and alarming system . we adopt fast fu lye ' s mutation rule - fft alternatives , by the way of carrying fft alternatives to the local junction circuit , regulated power supply , ups ' s power source , and switch power source , thereby diagnose every degree harmonious wave content of power souse , and abnormal coefficient , compared to the normal working situation . thereby diagnose out the working condition of the regulated power supply , ups ' s power source , and switch power source
如果有供电系统不稳定、波动大，电源的谐波含量过高，纹波系数过大，乃至电源设备损坏、输出异常等情况出现，将会严重影响视频信号的图像效果，大大降低防盗系统的稳定性和可靠性，我们采用快速傅利叶变换原理，即fft变换，通过对市电、稳压电源、 ups电源、开关电源等的电压信号进行fft变换，从而得出信号中各次谐波的含量及信号畸变系数，并将其与正常工况下的参数进行对比，从而进一步诊断出稳压电源、 ups电源、开关电源等设备的运行状况；组成监控系统的设备长期处于工作状态，往往由于设备散热条件不好、设备老化故障等原因导致设备表面温度过高，从而影响设备的正常运行，降低设备的使用寿命。 - After the system has been synchronized , we first use the least square method to make channel estimation , then separate the channel response information from the channel noises by dft . a weighting function based on the minimum mean square error ( mmse ) criteria can be applied to the time domain channel impulse response
在系统同步条件下，首先使用最小平方方法来估计信道响应，然后利用离散傅利叶变换的性质把信道响应信息和信道噪声分离，并在时域按最小均方误差准则做加权处理。