ME345_Lecture_20

ME345_Lecture_20 - M E 345 Spring 2008 Professor John M...

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M E 345 Spring 2008 Professor John M. Cimbala Lecture 20 02/29/2008 Today, we will : Do some example problems – analyzing the frequency content of a signal Do C a n d y Q u e s t i o n s f o r C a n d y F r i d a y If time, review the pdf module: Review of Basic Electronics Do some example problems – basic electronics Example Given : A voltage signal is sampled at two different sampling frequencies, 100 Hz and 160 Hz. The resulting frequency spectra are shown below: At f s = 100 Hz, two spikes appear in the frequency spectrum, at 20 and 40 Hz. f (Hz) Amplitude (volts) 0 4 2 1 3 0 20 40 At f s = 160 Hz, two spikes appear in the frequency spectrum, at 20 and 60 Hz. f (Hz) Amplitude (volts) 60 0 4 2 1 3 0 20 40 80 To do : Determine the frequencies most likely to actually be in the signal. Solution :
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Example Given : A voltage signal is sampled at three different sampling frequencies, 300 Hz, 600 Hz, and 1000 Hz. The resulting frequency spectra are shown below:
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This note was uploaded on 07/23/2008 for the course ME 345 taught by Professor Staff during the Spring '08 term at Penn State.

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ME345_Lecture_20 - M E 345 Spring 2008 Professor John M...

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