Apparatus and method for noise reduction
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United States of America Patent
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-
N/A
Issued Date -
May 1, 2003
app pub date -
Apr 20, 2001
filing date -
Apr 20, 2001
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A method and apparatus for noise cancellation in a communication device is disclosed. The method utilizes power supplied from a battery to a buzzer circuit and a plurality of analog impedance elements to generate an audible output which is applied to the circuit to cancel noise. The noise results from a non-constant driving current. The acoustic output is opposite but equal in magnitude to the noise. In an alternative, an algorithm may be programmed into a power management application specific integrated circuit (ASIC) to cancel the noise.
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