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- # סעיף א'
- A = 5;
- F = 100;
- T = 1/F;
- t = 0 : 0.01*T/100 : 5*T;
- teta1 = pi/4;
- yt = A*sin(2*pi*F*t+teta1);
- figure;
- plot(t, yt);
- grid;
- title("y(t)")
- # סעיף ב'
- fs1 = 2*F;
- ts1 = 1/fs1;
- n1 = 0:ts1:5*T;
- yn1 = A*sin(2*pi*F*n1+teta1);
- figure;
- stem(n1,yn1);
- title("y(t) when FS1 = 2F");
- # סעיף ג'
- fs2 = 5*F;
- ts2 = 1/fs2;
- n2 = 0:ts2:5*T;
- yn2 = A*sin(2*pi*F*n2+teta1);
- figure;
- stem(n2,yn2);
- title("y(t) when FS2 = 5F");
- # סעיף ד'
- A1 = 5;
- F1 = 100;
- T1 = 1/F1;
- t = 0: T1/100: 2*T1;
- teta1 = pi / 4;
- yt1 = A1 * sin(2 * pi * F1 * t + teta1);
- A2 = 7;
- F2 = 3 * F1;
- teta2 = pi / 6;
- yt2 = A2 * sin(2 * pi * F2 * t + teta2);
- y = yt1 + yt2;
- figure;
- plot(t, y);
- grid;
- title("y(t) = y1 + y2");
- # סעיף ה'
- fs3 = F1;
- ts3 = 1/fs3;
- n3 = 0:ts3:2*T1;
- yn1 = A1*sin(2*pi*F1*n3+teta1);
- yn2 = A2*sin(2*pi*F2*n3+teta2);
- ynf1=yn1+yn2;
- figure;
- stem(n3,ynf1);
- title("y(t) when FS3 = F1");
- # סעיף ו'
- fs4 = F2;
- ts4 = 1/fs4;
- n4 = 0:ts4:2*T1;
- yn1 = A1*sin(2*pi*F1*n4+teta1);
- yn2 = A2*sin(2*pi*F2*n4+teta2);
- ynf2=yn1+yn2;
- figure;
- stem(n4,ynf2);
- title("y(t) when FS4 = F2");
- # סעיף ז'
- fs5 = 3*F2;
- ts5 = 1/fs5;
- n5 = 0:ts5:2*T1;
- yn1 = A1*sin(2*pi*F1*n5+teta1);
- yn2 = A2*sin(2*pi*F2*n5+teta2);
- ynf23=yn1+yn2;
- figure;
- stem(n5,ynf23);
- title("y(t) when FS5 = F2*3");
- ----------------------------------------------------------------------------------
- # סעיף ח'
- #define OUT 25
- int dig;
- void setup() {}
- void loop() {
- for (dig = 0; dig < 255; dig++) {
- dacWrite(OUT, dig);
- delayMicroseconds(1);
- }
- for (dig = 255; dig > 0; dig--) {
- dacWrite(OUT, dig);
- delayMicroseconds(1);
- }
- }
- ----------------------------------------------------------------------------------
- 1. מדוע נדרש לדגום אות ?להמיר אות אנלוגי לאות ספרתי.
- 2. מה היתרון של עבודה עם אותות דיגיטליים על פני אותות אנלוגיים ?חסינות לרעש.
- 3. אם נדגום בתדר הקטן מהתנאי המינימלי של משפט הדגימה של נייקוויסט, מה יקרה ?האות לא ישוחזר בצורה נאמנה למקור.
- 4. תן דוגמה לאות אנלוגי. טמפרטורה, אור, כוח, צליל, מתח.
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