midterm2keyFall04C

# midterm2keyFall04C - Name STUDENT ID Number 2nd MIDTERM...

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Please initial here: ______________ Page 2 of 7 Total points on this page________ Good luck! (18 pts) True or False. Each statement is either true or false. Selecting both true and false is incorrect (2 pts each). 1) T F Sampling sound at the Nyquist frequency will enable you to compensate for sound sampling errors. 2) T F The speed of sound is greater in air than it is through water. 3) T F Echoes can affect the perceived pattern of amplitude modulation of a signal. 4) T F In general, fish communicate at higher frequencies than birds. 5) T F Boundary waves generally only carry low frequency sounds. 6) T F The SOFAR channel can allow signals to propagate over hundreds of kilometers. 7) T F Global attenuation involves the progressive attenuation of high frequencies to a greater extent than lower frequencies. 8) T F Frequency multipliers allow insects to produce higher frequencies and louder sounds. 9) T F Shadow zones are created in aquatic environments because sound prefers to propagate in a region of high sound velocity. 10) (4 pts) Briefly define the time-frequency uncertainty principle for Fourier analysis. The time-frequency uncertainty principle states that in any given Fourier analysis, you can either know the frequency very precisely or how the signal changes in time very precisely, but you cannot know both attributes precisely. Thus there is always a tradeoff. For example, if you know how the signal changes with time very precisely, you will only have a poor idea of the exact signal frequency.
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## This note was uploaded on 08/19/2010 for the course BIEB BIEB 166 taught by Professor Nieh during the Fall '06 term at UCSD.

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midterm2keyFall04C - Name STUDENT ID Number 2nd MIDTERM...

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