34 lines
733 B
Matlab
34 lines
733 B
Matlab
%% clean environment
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clear; close all; clc
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%% read input
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[signal, fs] = audioread("Canto1.mp3");
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%% Compute the FFT
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signal_length = length(signal);
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fhat = fft(signal, signal_length);
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PSD = fhat.*conj(fhat)/signal_length; % Power spectrum density
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%[S, freq, T, PSDlel] = spectrogram(signal, 128, 96, 128, Fs);
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% signal, window, noverlap, nfft, fs
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freq_vector = linspace(1, fs, signal_length);
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L = 1:floor(signal_length/2);
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cutoff_indices = abs(PSD)>0.002;
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PSD_clean = PSD.*cutoff_indices;
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fhat_filtered = cutoff_indices.*fhat;
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signal_filtered = ifft(fhat_filtered);
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figure(1)
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plot(PSD)
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figure(2)
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plot(PSD_clean)
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figure(3)
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plot(signal)
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figure(4)
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plot(signal_filtered)
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%% output
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audiowrite('restored.flac', signal_filtered, fs); |