Guruh talabasi Tohirov Akobir 3- labaratoriya ishi. Mavzu

211-17- guruh talabasi Tohirov Akobir

3- labaratoriya ishi.

Mavzu: Raqamli signallarning parametrlarini hisoblash.

Nazariy qism.

Raqamli signallar agalog signallarni muayyan t vaqt yoki boshqa x ko‘rsatkich oralig‘ida signalning amplituda qiymatlarini diskretlash va ketma-ket kvantlashdan hosil bo‘ladi.

Tovush signallarni diskretlash chastotasi:

• 
  8 000 Gs — telefon, nutq uchun yetarli;
  
• 
  11 025 Gs;
  
• 
  16 000 Gs;
  
• 
  22 050 Gs — radio;
  
• 
  32 000 Gs;
  
• 
  44 100 Gs — Audio CD;
  
• 
  48 000 Gs — DVD, DAT;
  
• 
  96 000 Gs — DVD-Audio (MLP 5.1);
  
• 
  192 000 Gs — DVD-Audio (MLP 2.0);
  

1. 
   Signal energiyasi
   

2. Nollar soni Z

bu yerda

dastur:

%%Meliboyeva Dilshoda

%% Signalni o'qib olish

[ s fs ]=wavread('Meliboyeva.wav');

%%subplot(1,2,1);

plot(s);

title('Signal');

grid on;

hold on;

%% Signal energiyasi (E)

for k=1:size(s)

E = sum(s(k)*s(k));

end

E = E./k;

%% Signalning max nuqtasi

max_s=0;

for k=1:size(s)

if(max_s < s(k))

max_s = s(k);

end

end

%% Signalning min nuqtasi

min_s=0;

for k = 1:size(s)

if(min_s > s(k))

min_s = s(k);

end

end

%%Signalning Z soni
for k=2:size(s)

if (s(k)>=0)

s(k)=1;

else

if(s(k)<0)

s(k)=-1;

Z=sum(abs(s(k)-s(k-1)));

end

Z=Z/2;

end

end