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Lecture 9

# Lecture 9 - 2 An omnidirectional microphone is placed on a...

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EEL 4930 Audio Engineering Lecture 9 Homework #7 Due #10 1. 3:1 Rule: As a rule of thumb, when two microphones are used to pick up two sources, the distance between the mics should be at least three times the distance from each mic to its nearest source. (a) How big (in dB) are the peaks and nulls if the spacing is 3:1, assuming omnidirectional microphones and plane waves? (b) How could you use figure-8 or cardioid microphones to minimize comb filtering in this situation?
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Unformatted text preview: 2. An omnidirectional microphone is placed on a stand 1 meter away from a reflecting surface and 2 meters away from a sound source that is also 1 meter away from the surface. (a) What are the three lowest frequencies that will be partially cancelled due to comb filtering? (b) If the reflection coefficient of the surface is 0.80, how deep will the nulls be and how large will the peaks be (in dB)? (c) Repeat (b) if the microphone is a cardioid mike pointed at the sound source....
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Lecture 9 - 2 An omnidirectional microphone is placed on a...

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