Search - frequency domain filter

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[Wavelet] chengxu DL : 0: 1．找点一段心电信号，画出信号时域波形和频谱图； 2. 利用MATLAB中的随机函数产生噪声加入到心电信号中，使心电信号被污染，读出污染后的号并画出对应信号的时域波形和频谱图； 3．用双线性变换法设计一个Butterworth带通滤波器，输出所设计的滤波器的阶次，分子、分母多项式的系数，画出滤波器的频率响应（幅频响应和相频响应）曲线；（也可以根据自己需要设置滤波器性能指标）带通通滤波器设计性能指标：fs1=10Hz, fp1=20Hz, fp1=1000Hz, fs2=1200Hz, ap=18dB,as=3dB 4．用滤波器对含噪声的心电信号进行滤波，画出滤波以后信号的时域波形和频谱； 5．比较滤波前后信号变化； -1. Find a ECG, draw time-domain signal waveform and frequency spectrum 2. Using MATLAB random function in the noise added to the ECG, so that the contaminated ECG signals, read out the contamination of the number and draw the corresponding time domain waveform and frequency spectrum 3. Bilinear transformation method used to design a Butterworth bandpass filter, the output of the order of the filter design, numerator, denominator polynomial coefficients, draw the filter frequency response (amplitude frequency response and phase frequency response) curve (you can also set filters based on their performance needs) Filter design with all the performance indicators: fs1 = 10Hz, fp1 = 20Hz, fp1 = 1000Hz, fs2 = 1200Hz, ap = 18dB, as = 3dB 4. Filters for ECG signal with noise filtering, after filtering the signal to draw the time-domain waveform and frequency spectrum 5. Compare signal change before and after filtering
Date : 2025-12-13 Size : 64kb User : 王方
[Wavelet] pulse DL : 0: 脉搏信号分析（1）设计滤波器，实现对脉搏信号的噪声抑制和基线纠漂；（2）时域分析：波形特征检测；（3）功率谱分析：对消噪后的信号进行功率谱分析。要求计算信号的功率谱，功率谱峰值，峰值频率。 -Pulse signal analysis (1) design the filter, to achieve the pulse signal noise suppression and baseline drift correction (2) time-domain analysis: waveform feature detection (3) power spectral analysis: noise cancellation signal after the power spectrum analysis . Require calculation of the signal power spectrum, peak power spectrum, peak frequency.
Date : 2025-12-13 Size : 6kb User : 胡广恒
[Wavelet] zishiying50hz DL : 0: 由仿真结果时域和频域图可以看出，工频50Hz干扰信号很好被滤除掉，说明所设计的自适应滤波器效果较好。-It can be seen by the domain and frequency domain simulation results in Figure, the frequency 50 Hz interference signals very well be eliminated, the design of the adaptive filter is better.
Date : 2025-12-13 Size : 1kb User : 李皓天
[Wavelet] liboqichengxi DL : 0: 巴特沃斯带通数字IIR滤波器对加了高斯随机噪声和正弦噪声的语音信号进行滤波，并绘制了两滤波器滤波后的语音信号时域图和频谱图。-Butterworth band-pass digital IIR filter added Gaussian random noise and sinusoidal noise of the speech signal is filtered, and draw a diagram of two filter the filtered speech signal time-domain and frequency spectrum.
Date : 2025-12-13 Size : 1kb User : 章离
[Wavelet] Audio-watermarking-internship-report DL : 0: 音频信号的水印设计，以音频信号为载体，将秘密信号嵌入载体音频信号当中，实现音频信号的水印。采用变换域小波变换（DWT）的技术，将音频信号进行小波变换，提取出低频分量，然后将水印嵌入到音频信号的低频当中。实验当中先在MATLAB 上面进行了仿真实验，并且通过加入噪声以及滤波等进行干扰以此检测了算法的透明性和健壮性，然后利用C 语言进行了测试，最后经过一些修改，例如加入定时器以及进行中断的处理和加入缓冲在DSP 板子上实现了加入水印的音频声音的播放。-Audio signal watermark design to audio signal as the carrier, the carrier signal is embedded in the audio signal. Realize audio signal watermark. The transform domain wavelet transform (DWT) technology, the audio signal wavelet transform to extract the low frequency component, and then the watermark is embedded in the audio signal of low frequency. Experiments on first in MATLAB, the simulation experiment and by adding noise and filter and so on interference to test the algorithm the transparency and robustness, and by using the C language were tested, and the Some modification, such as join timer and interrupt handling and join buffer in DSP board to add watermark audio sound broadcast.
Date : 2025-12-13 Size : 293kb User : 江晨城
[Wavelet] kaywing-windows-and-IIR-filter DL : 0: 实现各种典型窗函数的时域与频域特性、已知滤波器条件设计巴特沃思等滤波器、或已知系统函数可求出数字滤波器。-Achieve a variety of typical window function in time domain and frequency domain characteristics, known design Butterworth filter criteria such as filters, or known to the system function can be obtained digital filter.
Date : 2025-12-13 Size : 3kb User : lau kaywing
[Wavelet] matlab DL : 0: 数字图像频域滤波处理，分别进行二阶巴特沃斯(Butterworth)高通、低通滤波器。-Digital image processing frequency domain filtering, respectively second-order Butterworth (Butterworth) high pass, low pass filter.
Date : 2025-12-13 Size : 53kb User : 王洪喆