# Summary1 - n = A cos ω n θ = A cos ω n 2 kπn θ The...

This preview shows pages 1–4. Sign up to view the full content.

Summary 1 Hamid Jafarkhani Digital Signal Processing Summary 1 – p. 1/

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Continuous-Time Sinusoidal Signals X a ( t ) = A cos(Ω t + θ ) = A cos(2 πFt + θ ) If we fix the frequency, F , then X a ( t ) is periodic. If two sinusoids have different values of F , then they are different functions. As F increases, the sinusoid oscillates faster. Summary 1 – p. 2/
Discrete-Time Sinusoidal Signals X ( n ) = A cos( ωn + θ ) = A cos(2 πfn + θ ) A discrete-time sinusoid is periodic only if its frequency f is a rational number. X ( n ) = cos( n ) is not periodic! Discrete-time sinusoids with different frequencies can be identical. X k ( n ) = A cos( ω 0 n + θ ) =

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: n ) = A cos( ω n + θ ) = A cos( ω n + 2 kπn + θ ) The highest rate of oscillation in a discrete-time sinusoid is attained when ω = π (or ω =-π ) or equivalently f = 1 2 (or f =-1 2 ). Summary 1 – p. 3/ 4 Some Useful Definitions Energy: E = ∞ s n =-∞ | x ( n ) | 2 Cross correlation between real signals x ( n ) and y ( n ) : r xy ( l ) = ∞ s n =-∞ x ( n ) y ( n-l ) Auto correlation (real signal): r xx ( l ) = ∞ s n =-∞ x ( n ) x ( n-l ) Summary 1 – p. 4/ 4...
View Full Document

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern