clc;
clear all;
close all;
format long;

% Nacteni signalu
[i,fs,b] = wavread('Sound.wav');
N = length(i);
figure; stem((0:length(i)-1)/fs,i,'.');
title('Vstupni signal');
xlabel('t[s]');
ylabel('s(t)');
grid on;

% Nacteni filtru
f = dlmread('filtr.dat', '\n');
figure; stem((0:length(f)-1)/fs,f);
title('Impulzova odezva filtru');
xlabel('t[s]');
ylabel('s(t)');
grid on;

% Konvoluce
o = conv(i, f);
wavwrite(o, fs, b, 'vystup.wav');
figure; stem((0:length(o)-1)/fs,o,'.');
title('Vystupni signal');
xlabel('t[s]');
ylabel('s(t)');
grid on;

% Spektrum vstupniho signalu
is = fftshift(fft(i));
figure; stem((-length(is)/2:length(is)/2-1)*fs/length(i),abs(is),'.');
title('Spektrum vstupniho sugnalu');
xlabel('f[Hz]');
ylabel('S(f)');

% Spektrum vystupniho signalu
os = fftshift(fft(o));
figure; stem((-length(os)/2:length(os)/2-1)*fs/length(o),abs(os),'.');
title('Spektrum vystupniho signalu');
xlabel('f[Hz]');
ylabel('S(f)');

% Energie vstupu a vystupu
Ein = sumsqr(i)
Eout = sumsqr(o)

return;