由于数字信号处理(digital signal processing)的领域中,我们处理的信号都是经过采样(sampling)的,而这些信号的采样点数是有限的。因此离散Fourier变换是一个有限维内积空间里的基变换。我们设信号采样的数量为N,则我们的信号向量 x\in\mathbb{C}^N 。在离散场景下我们定义信号(时域下的)自然基: \mathbf{\hat{e}...
第三章离散傅立叶变换DFT3.1 离散傅立叶变换的几种形式3.2 离散傅里叶变换DFT3.3 离散傅里叶变换的性质3.4 频域采样数字信号处理,;:啖Digital signal processing土工离散傅立lO换的几种形式1 .连续周
DFTandFFTisoneofthemostimportantpartsindigitalsignalprocessing.DFTisthe basisforFFTinthefastalgorithmOfDFT.TheDFTofsequencecanbecalculatedbyusing thefunctionofFFTinMATLAB.Basically,digitalsignalprocessing(DSP)cansolvesignal processingproblemsfromtwoaspects:oneisthetimedomainmethod,namelydigital ...
DFT是离散傅里叶变换的意思，可以参见信号与系统或数字信号处理基础。
数字信号处理(第2版) 陈后金-ch2 4DFT分析信号频谱.ppt,数字信号处理 (Digital Signal Processing) 利用DFT分析信号频谱 问题的提出 四种信号频谱之间的关系 利用DFT分析连续非周期信号频谱 混叠现象、泄漏现象、栅栏现象 DFT参数选取 求x(t)=e-t u(t)的幅度谱 求x(t)=e-
The Discrete Fourier transform (DFT) is an important tool in digital signal processing. In this paper, a novel approach to DFT is proposed. The computation of DFT is transformed to the computation of the first-order moments by the simple mathematical deductions. It is well known that the firs...
Key words:DFT; spectrum analysis; digital signal processing; analog signal 0引言 数字信号处理课程是电子信息类、自动化、机械工程等专业的一门重要专业基础课程[1]。主要内容包括离散时间信号和系统的基本概念以及时域分析方法、离散时间信号的FT和ZT变换、离散时间信号的DFT和FFT变换、系统的网络结构、FIR和IIR滤波...
参考文献 1. Smith, S., The Scientist and Engineer's Guide to Digital Signal Processing, 2nd edition, [Online]. Available: 2. Wikipedia contributors. (2022, January 12). Discrete Fourier transform. In Wikipedia, The Free Encyclopedia. Retrieved 07:55, January 23, 2022, from©...
It is known that the discrete Fourier transform (DFT) used in digital signal processing can be characterized in the framework of the representation theory ... M Püschel,JMF Moura - 《Siam Journal on Computing》 被引量: 205发表: 2003年 A polynomial approach to fast algorithms for discrete Fou...
It is an expansion of 1-D case. The authors also show that these formulas is very useful in digital signal processing when the digital signal is real. In particular, the 2-D Mallat decomposition algorithm is significantly improved.孙琦四川大学数学学院,成都 610064唐远炎...