Electrical Engineering 145M - Spring 1996 - Derenzo - Midterm 2

Electrical Engineering 145M - Spring 1996 - Derenzo - Midterm 2

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Unformatted text preview: Name (Last, First) UNIVERSITY OF CALIFORNIA College of Engineering Electrical Engineering and Computer Sciences Department EECS 145M: Microcomputer Interfacing Laboratory Spring Midterm #2 (Closed book- calculators OK) Monday, April 15, 1996 PROBLEM 1 (70 points) Design a system for analyzing the harmonic content of musical instruments using the FFT. You know that the sounds will have a fundamental frequency and higher harmonics of that frequency. The requirements are: Maximum frequency of interest 20 kHz (but higher frequencies may occur) Frequency resolution 0.1 Hz (closest frequencies that can be clearly resolved in the FFT) Waveform voltage resolution 0.015% of full range Minimal spread of spectral leakage You have available the following: A microphone and instrumentation amplifier capable of converting music to an analog waveform with an amplitude of 5 volts. A microcomputer with a counter/timer, an digital input port, and FFT program code. The digital input port has a data available status bit (input). The input port requires 1 s to read a byte of data or the status bit. You may assume that other computer operations take a negligible amount of time.negligible amount of time....
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Electrical Engineering 145M - Spring 1996 - Derenzo - Midterm 2

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