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DFT进行频谱分析时的三种现象
- DFT进行频谱分析时的三种现象 1、混叠:对连续信号采样,要求连续信号是带限的,采样频率要足够高。Fs应满足Nyquist采样定理才不产生混叠。 采样前加低通滤波器防混叠 2、频谱泄漏:DFT对时域信号进行了截断(相当于采样信号乘了一个窗函数),时域的乘积相当于频域卷积,改变了原信号频谱。 改用其他窗函数(非矩形)改善泄漏。 3、栅栏现象:DFT 只给出了频谱在采样点上的取值,采样点间的频谱内容丢失。-DFT spectrum analysis of a
AM
- FIRPM公园,麦克莱伦最佳equiripple FIR滤波器的设计。乙= FIRPM(不适用,女,甲)返回一个长度为N +1线性相位(真实,对称系数)FIR滤波器具有最佳逼近到所需的频率响应的F和描述在极小极大意义的。F是成对频带边缘载体,以递增0和1之间秩序。 1对应于奈奎斯特频率或采样频率的一半。至少有一个频段必须有一个非零宽度。 A是一个真正的载体,作为F的指定由此得到的滤波器的频率响应所需的幅度B相同大小- FIRPM Parks-McClellan optimal equirippl
Exam4_1
- 通过matlab实现Nyquist滤波器-realization of Nyquist filter
MATLAbshuzilvboqi
- 基于MATLAB的FIR数字滤波器设计 加深对数字滤波器的常用指标和设计过程的理解。 FIR滤波器实现一般采用窗函数法和等纹波设计法。窗函数法还包含两个分支,一种是用公式先手动算出N值和其他对应得窗函数参数值,再代入窗函数和fir1实现,一种是用函数*rord估算出N和相应参数再用fir1实现。不过要注意*rord会低估或高估阶次n,可能会使滤波器达不到指定的性能,这时应稍微增加或降低阶次。如果截止频率在0或Nyquist频率附近,或者设定的dev值较大,则得不到正确结果-MATLAB-
demo_SquareRootNyquistFilterDesignSoftware
- 数字通信中的平方根Nyquist滤波器设计,含说明文件和matlab仿真代码-The square root Nyquist digital communication filter design, including documentation and matlab simulation code
hrollfcoef
- 升余弦滚降滤波器,主要完成 Generate coefficients of Nyquist filter-Raised Cosine filter, mainly to complete Generate coefficients of Nyquist filter
Butterworth_Lowpass_Filter
- The Butterworth low pass filter with parameters input from keyboard Example: Fpass = 250 Ap = 2 Fstop = 500 As = 70 Fs = 2000 FN = Fs/2 Nyquist frequency-The Butterworth low pass filter with parameters input from keyboard Example: Fp
filter.resamp_cdda.vs8
- 这是一个DirectShow过滤器,它专门用于CD音频重采样(把44100Hz采样率的音频信号 转化为 48000Hz的);采用了高精度的奈奎斯特重采样算法,品质极佳;已经编译并且运行良好;-This is a DirectShow filter, it specifically for CD audio resampling (the audio signal into 44100Hz to 48000Hz sampling rate) and the use of a high-preci
firnyquistdemo
- 基于matlab的奈奎斯特fir滤波器的优化设计算法-FIR Nyquist (L-th band) Filter Design
resampler_private_up2_HQ
- Uses 2nd order allpass filters for the 2x upsampling, followed by a notch filter just above Nyquist. -Uses 2nd order allpass filters for the 2x upsampling, followed by a notch filter just above Nyquist.
根升余弦滤波器
- 产生根升余弦滤波器,并绘制其成型滤波,频域图(Generatging Nyquist filter, and plot the figure of Frequence-Amptitude)
TELE - 653 Digital Coding
- e Handbook Entry Communication concepts: Fourier transforms, random signals, Transmitter and receiver filters, matched filter, Nyquist criterion. Digital Modulation schemes: M-ary ASK, QPSK, FSK, CPM, spectral analysis of modulated signals, ML and