Environmental noise reduction and cancellation for a cellular telephone communication device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Issued Date -
Nov 15, 2007
app pub date -
Apr 11, 2006
filing date -
Apr 11, 2006
priority date (Note) -
Abandoned
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Abstract
A system and method for reducing or entirely canceling background or environmental noise from a voice transmission from a communications device. A communications device, such as a cellular telephone or cordless telephone, is configured with an environmental noise counterbalanced (correction) signal generator that is connected between a microphone and a continuous time quadrant multiplication. The original output of the microphone and a counterbalanced (correction) signal generated by the environmental noise counterbalanced (correction) signal generator are mixed or combined together prior to being passed to a transmitter. In one embodiment a discrete time unit (discrete time processing) block with or without signal processing is provided between the microphone and the continuous time quadrant multiplication to help synchronize the timing of the signals to be mixed. In another embodiment a second microphone is employed to detect environmental noise.
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