| 1. | A fast fourier transform algorithm to estimate carrier frequency deviation
快速傅里叶变换载波频偏估计算法 |
| 2. | Parallel fast fourier transform algorithm based on binary fat tree network
一种基于二叉胖树模型的并行fft算法 |
| 3. | The fast fourier transform algorithm for the solution of the level - 2 - ciculant linear systems of type
循环线性系统求解的快速傅里叶算法 |
| 4. | In order to eliminate the transient current and ensure the test precision , this paper introduces the principle and the method of phase selection of the ac based on fft ( fast fourier transform algorithm )
为了消除暂态电流，本文阐述了一种基于快速傅立叶变换( fft )的交流选相合闸技术的原理以及实现方法，保证了检测精度。 |
| 5. | Choose the proper sample and compare by two means . first is to compare actual value to the calculated , and second is analysis of the effect on harmonic wave . take fast fourier transform algorithm to the samples fore - and - aft integral , and compare the amplitude and angle
首先是直接比较实际值与还原值，其次是分析各种算法对谐波的影响：分别对积分前后的采样值进行快速傅立叶变换，比较各次谐波幅值和相位的变化。 |
| 6. | The binary fat tree is a network topology which is prone to accomplish butterfly computing . according to this feature , a logical model for binary fat tree was constructed at first , and then a parallel fast fourier transform algorithm based on it was devel . .
二叉胖树网络结构是一种易于实现蝶式计算的网络拓扑结构，基于这一特点，首先构造了一种二叉胖树的逻辑模型，并提出了一种基于该模型的并行快速傅立叶变换算法。 |
| 7. | It is stressed in this paper the analysis methods used in vibration faults of average power spectrum and cepstrum , based on the fast fourier transform algorithm , and development of the vibration signal analysis system in test - driving of wj6 engine , involved the technic of software or hardware
文章重点给出基于fft技术的功率谱和倒频谱分析方法、振动信号分析系统的设计和实现，讨论了相应软件开发中所涉及的技术问题。 |
| 8. | In order to investigate the unsteady flow frequency domain performances of an axial flow compressor at different mass flow , rotating speed and blade row spacing , plus inlet flow distortion , and considering aerodynamic characteristics and stability of the compressor , the low speed research compressor ( lsc ) at college of energy and power in nuaa is used to carry out the experiment studies . a large amount of test data has been gained through dynamic pressure transducers embedded in the stator blades at the tip , middle and hub section , then fast fourier transform algorithm ( fft ) is applied to calculate the frequency data
为探讨轴流压气机在工作流量、工作转速及动?静叶排轴向间距变化时的叶片排流场非定常频谱特性变化规律，并耦合进气畸变的影响，同时与压气机气动性能和气动稳定性相关联，作者利用南京航空航天大学能源与动力学院的低速大尺寸轴流压气机( lsc )试验器，采取在静子叶片表面埋入动态压力传感器的实验方法，对叶尖、叶中和叶根三个截面的动态压力进行了测量，获得了大量的可靠的实验数据。 |
| 9. | In the course of the design , critical technologies are applied , such as digital phase - locked loop , fast fourier transform algorithm , universal asynchronous receiver & transmitter , and so on . in the project , as a important component , the module of monitoring the buses " power quality takes a long time
在设计过程中，使用的关键技术有：使用cpld仿真多路sspc多种状态；在对汇流条电能质量的监测过程中采用频率跟踪技术? ?全数字锁相环；应用fpga技术使用fft运算进行谐波分析；通用异步收发器等技术。 |
| 10. | At present , the typic harmful current detection methods are the fast fourier transform algorithm in frequency domain and methods based on the instantaneous reactive power theory , these methods all require some transform and quick , real - time calculating , so high precision analog multipliers or high speed dsp chip with fast a / d are needed , this results in complex circuit and high cost ， which have restricted the development of apf
目前畸变电流检测常用的方法有频域法的fft和基于瞬时无功理论的畸变电流检测法。这些方法均有一定的变换，需要快速、实时运算，因此必须使用高速的数字微处理器和高性能a / d转换器，这必将大大提高系统成本，使得电路结构复杂，在一定程度上限制了有源滤波器的发展。 |
