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Filtering noise from an audio signal
https://www.mathworks.com/matlabcentral/answers/1608710-filtering-noise-from-an-audio-signal
w0 = 2*pi*fc_notch/Fs; p = 0.995; % digital notch (IIR) num1z= [1 -2*cos (w0) 1]; den1z= [1 -2*p*cos (w0) p^2]; % now let's filter the signal. signal = filter (num1z,den1z,signal); …
Audio signal analysis with filter by using FIR filter and ...
https://web.eecs.umich.edu/~girasole/teaching/451/2014fall/gradprojects/EECS451_Project_Report_Jianhang_Qiu.pdf
to use the filter make the noise clear and to see whether the filter works well. For the sinc noise we use the function below: >> f_y1=filter(h_bs,1,y1); >>f_Y1=abs(fft(f_y1)); The comparison of waveforms in time and frequency domain of original signal and noise after filter are below: Fig. 4. Comparison of signal before and after filter
Audio signal noise cancellation with adaptive filter ...
https://www.sciencedirect.com/science/article/pii/S2214785321049324
Adaptive filtering systems are designed to reduce noise while obtaining an uncorrupted desired signal. Digital filters like IIR and FIR are feasible filtration mechanisms to combat the noise effect on voice signal propagation. The use of adaptive filters has resulted from the improvement of these digital filters.
Audio Signal Noise Filter Problem - Signal Processing ...
https://dsp.stackexchange.com/questions/6171/audio-signal-noise-filter-problem
Wiener filtering is one approach. It might even be the best approach. A Wiener filter is designed to minimize the noise (in the least squares sense) and invert the effect of the impulse response, given a known signal and a signal that is known to be tainted with noise and an impulse response.
Audio Noise Reduction Using Low Pass Filters
https://file.scirp.org/pdf/OALibJ_2017110914303851.pdf
The sound sample was passed on a low pass filter where a new audio signal was obtained after noise re- duction, the low pass filter that is used to reduce the noise from the signals with the different frequency and ripple factor. These filters perform the filtering op- erations by the computation of difference equations.
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