Q1 - ECE 402 Communications Engineering Quiz 1 Fall 2009...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ECE 402 Communications Engineering Quiz 1 Fall 2009 TEST NAME: STUDENT NUMBER: INSTRUCTIONS • Write your name and student number in the space provided above. • This quiz is closed book and closed notes. • One handwritten 8.5” × 11” reference sheet may be used (both sides). • Conventional calculators may be used (but no computers, PDAs or other wireless devices) • Give step-by-step solutions that include all details. Assume the graders know only the basics. • Box your final answer . GRADES 1 2 3 4 Total 1 Problem 1 (25 pts): A signal is digitally recorded using sampling and uniform quantization. Assuming the highest frequency tone to be recorded is 8,000 Hz, what is the minimum sampling rate that can be used? How many bits would be required to store one minute of this signal at a signal- to-quantization noise ratio of at least 80 dB? Assume that the signal is peak-limited to | x ( t ) | ≤ 1 V and has normalized power P x = 0 . 25 W. 2 Problem 2 (25 pts): Find the Fourier Transform of x ( t ) = 1 1 + t 2 . 3 Problem 3 (25 pts): The joint pdf of two random variables X and Y is f X,Y ( x,y ) = { 3 x 4 y 2 , y ≥ 1 ,x ≥ 1 , otherwise (a) Find the marginal pdf of X ....
View Full Document

This note was uploaded on 01/28/2012 for the course ECE 402 taught by Professor Townsend during the Fall '08 term at N.C. State.

Page1 / 7

Q1 - ECE 402 Communications Engineering Quiz 1 Fall 2009...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online