Noise canceling method and apparatus increasing channel capacity
First Claim
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1. A method of noise reduction and/or noise cancellation in a wireless system comprising the steps of:
- (a) detecting a speech signal from a microphone;
(b) detecting background noise from a microphone; and
(c) subtracting the background noise from the speech signal.
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Abstract
Improvements to the capacity of communication channels are achieved with a multi-microphone system. A voice microphone collects sound waves from the user as well as unwanted background noise. A second background microphone collects ambient sound. The inputs from the two microphones retain their analog format. The signal from the background microphone is subtracted from the input of the voice microphone. The resulting signal has an increased signal to noise ratio which in turn increases the capacity of the communication channel.
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12 Claims
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1. A method of noise reduction and/or noise cancellation in a wireless system comprising the steps of:
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(a) detecting a speech signal from a microphone;
(b) detecting background noise from a microphone; and
(c) subtracting the background noise from the speech signal. - View Dependent Claims (2, 3, 4)
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5. A noise reducing and/or noise cancelling device comprising:
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(a) means for detecting background noise;
(b) means for detecting a speech signal; and
(c) means for subtracting the background noise from the speech signal. - View Dependent Claims (6, 7, 8)
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9. A method of increasing the capacity of a channel by noise reduction and/or noise cancellation comprising the steps of:
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(a) detecting a speech signal from a microphone;
(b) detecting background noise from a microphone; and
(c) subtracting the background noise from the speech signal. - View Dependent Claims (10, 11, 12)
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Specification