Manual STFT to obtain spectrogram of an audio signal
11 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Hi, Im trying to obtain the notes that are on an audio signal by using the spectrogram to know the frequencies on it, but i dont know why this code plots me an empty graph. Can sombody help me please.
[x,fs]= audioread("estrellita.mp3");
dt = 1/44100;
t=0:dt:(117204*dt)-dt;
S = zeros(501,117);
windowlength = 1e3;
k = 1;
for jj = 1:117
y = x(k:k+windowlength-1)';
ydft = fft(y).*gausswin(1e3);
S(:,jj) = ydft(1:501);
k = k+windowlength;
end
F = 0:44100/1000:44100/2;
T = 0:(1e3*dt):(117000*dt)-(1e3*dt);
surf(T,F,20*log10(abs(S)),'EdgeColor','none')
axis xy; axis tight; colormap(jet); view(0,90);
xlabel('Time');
ylabel('Frequency (Hz)');
set(gca,'YDir','Normal')
xlabel('Time (secs)')
ylabel('Freq (Hz)')
title('Short-time Fourier Transform spectrum')
0 commentaires
Réponses (1)
UMAIR RASOOL
le 1 Août 2020
close all
clear all
clc
[y,Fs]=audioread('black_hole.mp3');
Y=fft(y,Fs);
L= (1:length(Y))*Fs/length(Y);
plot(L,abs(Y))
xlabel('Frequency');
ylabel('Amplitude');
title('(Magnitude Spectrum')
windowSize = 256;
windowOverlap = [];
freqRange = 0:Fs;
spectrogram(y(:,1), windowSize, windowOverlap, freqRange, Fs, 'xaxis');
0 commentaires
Voir également
Catégories
En savoir plus sur Time-Frequency Analysis dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!