AMBIENT NOISE CANCELLATION FOR VOICE COMMUNICATIONS DEVICE
First Claim
1. A communications device, comprising:
- a microphone having a microphone output;
an ambient noise compensation signal generator having an ambient noise compensation signal generator input connected to the microphone output and receiving an ambient noise compensation signal generator output;
a mixer having (i) a first mixer input in communication with the microphone output and (ii) a second mixer input connected to the ambient noise compensation signal generator output and (iii) a mixer output; and
a transmitter having a transmitter input connected to the mixer output and a transmitter output in communication with an antenna,wherein the ambient noise picked up by the microphone is attenuated before being passed to the transmitter.
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Accused Products
Abstract
A system and method for reducing or entirely canceling background or ambient noise from a voice transmission from a communications device. A communications device, such as a mobile telephone, is configured with an ambient noise compensation signal generator that is connected between a microphone and a mixer. The original output of the microphone and a compensation signal generated by the ambient noise compensation signal generator are mixed together prior to being passed to a transmitter. In one embodiment a buffer is provided between the microphone and the mixer to help synchronize the timing of the signals to be mixed. In another embodiment a second microphone is employed to detect ambient noise.
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Citations
21 Claims
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1. A communications device, comprising:
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a microphone having a microphone output; an ambient noise compensation signal generator having an ambient noise compensation signal generator input connected to the microphone output and receiving an ambient noise compensation signal generator output; a mixer having (i) a first mixer input in communication with the microphone output and (ii) a second mixer input connected to the ambient noise compensation signal generator output and (iii) a mixer output; and a transmitter having a transmitter input connected to the mixer output and a transmitter output in communication with an antenna, wherein the ambient noise picked up by the microphone is attenuated before being passed to the transmitter. - View Dependent Claims (2, 3, 4, 5)
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6. A communications device, comprising:
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a first microphone having a microphone output; a second microphone having a microphone output; an ambient noise compensation signal generator having (i) an ambient noise compensation signal generator input connected to the second microphone output and (ii) an ambient noise compensation signal generator output; a mixer having (i) a first mixer input in communication with the first microphone output and (ii) a second mixer input connected to the ambient noise compensation signal generator output and (iii) a mixer output; a transmitter having a transmitter input connected to the mixer output and a transmitter output in communication with an antenna, wherein ambient noise picked up by the second microphone is processed by the ambient noise compensation signal generator and wherein the ambient noise is attenuated before being passed to the transmitter. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A communications device, comprising:
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means for detecting ambient noise; means for detecting a voice signal; means for attenuating ambient noise, wherein the means for attenuating ambient noise attenuates ambient noise detected by the means for detecting ambient noise thereby reducing the ambient noise associated with the voice signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21-23. -23. (canceled)
Specification