Enhancing automatic noise reduction using negative output resistance
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United States of America Patent
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Sep 23, 2003
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app pub date -
Feb 26, 1999
filing date -
Feb 26, 1998
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Abstract
An Automatic Noise Reduction system wherein the Q of the frequency response is reduced using a negative output resistance to substantially eliminate the coil resistance of a speaker in a headset. The resulting system is less sensitive to variations in operating parameters, such as headset fit on a user and component variations. Temperature compensation of a negative output resistance amplifier is introduced to maintain stability over a wide range of operating temperatures. Temperature compensation includes substantially matching the temperature coefficient of the negative output resistance amplifier to the temperature coefficient of the speaker coil.
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