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2025-L09

# 2025-L09 - EE-2025 Spring-2004 Lab#4 Announcement NO...

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EE-2025 Spring-2004 Lecture 9 D-to-A Conversion 9-Feb-2004 2/7/2004 EE-2025 Spring-2004 jMc 2 Lab #4 Announcement NO “regular” Lab on Tuesday, 10-Feb Instead, 12-3 Open lab for help on Lab #4 Lab #4 listening starts on Wed Formal Lab Report: will be worth 150 pts Make the song sound right Get the Correct frequencies and durations Then tweak Eliminate “clicks” with envelope Lab #5 is posted Practice image display and down-sampling 2/7/2004 EE-2025 Spring-2004 jMc 3 Concatenating Sinusoids How do you prevent JUMPS? Envelope: taper the beginning & end Example Freq = { 1.8, 2.4, 3.0 , 3.6, 4.2, 4.8 } Hz 2/7/2004 EE-2025 Spring-2004 jMc 4 Education E ducation is an admirable thing, but it is well to remember from time to time that nothing that is worth knowing can be taught.” ……Oscar Wilde So, Labs are one way to approximate knowledge acquisition in the “real world” Lecture

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2/7/2004 EE-2025 Spring-2004 jMc 5 READING ASSIGNMENTS This Lecture: Chapter 4: Sections 4-4, 4-5 Other Reading: Recitation: Section 4-3 (Strobe Demo) Next Lecture: Chapter 5 (beginning) 2/7/2004 EE-2025 Spring-2004 jMc 6 LECTURE OBJECTIVES FOLDING: a type of ALIASING DIGITAL-to-ANALOG CONVERSION is Reconstruction from samples SAMPLING THEOREM applies Smooth Interpolation Mathematical Model of D-to-A SUM of SHIFTED PULSES Linear Interpolation example 2/7/2004 EE-2025 Spring-2004 jMc 7 A-to-D Convert x(t) to numbers stored in memory D-to-A Convert y[n]
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