Ambient noise cancellation for voice communication device
First Claim
1. A communications device, comprising:
- a body portion;
a microphone having a microphone output providing a first signal, the microphone being spatially distant from the body portion;
an ambient noise compensation signal generator having an ambient noise compensation signal generator input connected to the microphone output and receiving the first signal and an ambient noise compensation signal generator output;
a mixer having (i) a first mixer input in communication with the microphone output and receiving the first signal and (ii) a second mixer input connected to the ambient noise compensation signal generator output and (iii) a mixer output; and
a transmitter within the body and 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
23 Claims
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1. A communications device, comprising:
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a body portion;
a microphone having a microphone output providing a first signal, the microphone being spatially distant from the body portion;
an ambient noise compensation signal generator having an ambient noise compensation signal generator input connected to the microphone output and receiving the first signal and an ambient noise compensation signal generator output;
a mixer having (i) a first mixer input in communication with the microphone output and receiving the first signal and (ii) a second mixer input connected to the ambient noise compensation signal generator output and (iii) a mixer output; and
a transmitter within the body and 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 body portion;
a first microphone having a microphone output providing a first signal containing both voice and ambient noise, the first microphone being spatially distant from the body portion;
a second microphone having a microphone output providing a second signal containing substantially only ambient noise, the second microphone being within the body portion;
an ambient noise compensation signal generator having (i) an ambient noise compensation signal generator input connected to both the first microphone output and 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, and an enable/disable switch for enabling/disabling the ambient noise compensation signal generator, wherein ambient noise picked up by the first microphone and 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, 11)
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8. (canceled)
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9. (canceled)
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10. (canceled)
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12. (canceled)
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13. A communications device, comprising:
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a body portion;
means for detecting ambient noise, the means for detecting ambient noise having an omnidirectional sensitivity;
means for detecting a voice signal, the means for detecting a voice signal has a directional sensitivity;
means for attenuating the ambient noise, wherein the means for attenuating ambient noise generates an output that attenuates ambient noise detected by the means for detecting ambient noise thereby reducing the ambient noise associated with the voice signal;
a means for mixing the ambient noise detected by the means for detecting ambient noise and the voice signal detected by the means for detecting the voice signal with the output from the means for attenuating ambient noise thereby reducing the ambient noise associated with the voice signal;
a means for transmitting the voice signal, wherein the means for transmitting receives input from the means for mixing; and
means for receiving a selection from a user of the communications device to activate and deactivate the means for attenuating ambient noise independently of powering on and off the communications device. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification