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Midterm Exam 1 Review Spring 2003: Sound concepts

Try the problem here from Sp 2003 Midterm Review #1
2. The Nyquist Theorem states that we need twice as many samples as the maximum frequency in order to represent and recreate the original sound. The number of samples recorded per second is the sampling rate. This is just a guess, but you can't hear CD music well over a telephone because sounds are waves of air pressure that come in cycles. Since our perception of volume is related logarithmically to changes in amplitude (which is the maximum height of the wave), and telephones distort waves, CD's are low and fuzzy over the phone.
3. REMOVEDilarly, our perception of volume is related logarithmically to changes in amplitude (which is the maximum height of the wave). This means that when the wave height changes, our perception of volume changes.
Kelly Farrell

The reason we can't hear CD's nicely over the telephone is that phones can only capture 8000 samples per second (or 4000Hz). A CD captures everything we can hear (44,000 samples per second-> 22,000Hz). Since CD's capture REMOVED samples, phones can only convey a few of those samples- making it fuzzy. We hear portions of those samples and not all of those samples through the phone.
Student116
We don't hear portions of the sample: We hear portions of the original sound. We don't get all the frequencies that were in the original sound. Mark Guzdial



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