tired.m

% Matlab Task 11 SMB2 31.1.18
% Task1Floating Window

clear;

load e23;
f0 = 250;
signal = e23;
t = 1/f0:1/f0:length(signal)/f0;

winsize = 24;

stft_coef = zeros(winsize/2+1, length(e23));
stft_result = zeros(length(e23), 1);
curr_signal = zeros(winsize/2+1, 1);

% startpunkt:schrittweite:endpunkt
for i=winsize/2:1:length(signal)-(winsize/2) %fenster
    
    curr_signal = signal(i-winsize/2+1:i+winsize/2);
    hamm_win = hamming(winsize);
    curr_signal = curr_signal.* hamm_win;
    %plot(hamm_win);
    stft_coef = abs(fft(curr_signal));    
    stft_result(i-winsize/2+1:i+winsize/2) = stft_coef;
end

%plot(stft_result);
    
    figure(1); clf; 
    imagesc(stft_result); colorbar;
    title('STFT with win size 24');
    
    figure(2); clf;
    plot(t, signal);
    title('e23.signal');