Audio headset
First Claim
Patent Images
1. An audio device, comprising:
- an earpiece having a transducer that converts an input audio signal from a user into a transmit signal and also converts a receive sianal received from an external device into an audio output sianal intended for listening to by the user, the receive signal including transmit signal components;
a full duplex mode circuit coupled to the transducer including;
a first amplifier having a first input coupled to a first terminal of the transducer and a second input receiving a receive signal with reduced transmit signal components, wherein the first amplifier outputs a combined output signal that includes the transmit signal and the receive signal with the reduced transmit sianal components; and
a second amplifier having a first input coupled to ground and a second input coupled to the same receive signal with the reduced transmit signal components received by the first amplifier, wherein the second amplifier outputs the receive signal with the reduced transmit signal components; and
a digitall signal processing system that isolates the transmit signal from the receive signal, including;
a first input receiving the combined output signal from the first amplifier;
a second input receiving the receive signal from the external device having the transmit signal comnonents;
an output outputting the receive signal with the reduced transmit signal components to the first and second amplifiers; and
a third input receiving the receive signal with the reduced transmit signal components back from the second amplifier.
2 Assignments
0 Petitions
Accused Products
Abstract
A headset includes two earpieces. One earpiece acts as a microphone, and the other earpiece acts as an earphone. Isolated from background noise and vibrations due to bone conduction, the microphone earpieces convert voice sounds from the air column in the external ear canal into electrical signals. Other embodiments of the invention address feedback problems and achieve improved performance relative to existing full duplex communication devices. In another embodiment of the invention a headset includes a band having opposite ends that extend in a forward direction from the two earpieces. The band then either extends downwardly or backwards.
158 Citations
17 Claims
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1. An audio device, comprising:
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an earpiece having a transducer that converts an input audio signal from a user into a transmit signal and also converts a receive sianal received from an external device into an audio output sianal intended for listening to by the user, the receive signal including transmit signal components; a full duplex mode circuit coupled to the transducer including; a first amplifier having a first input coupled to a first terminal of the transducer and a second input receiving a receive signal with reduced transmit signal components, wherein the first amplifier outputs a combined output signal that includes the transmit signal and the receive signal with the reduced transmit sianal components; and a second amplifier having a first input coupled to ground and a second input coupled to the same receive signal with the reduced transmit signal components received by the first amplifier, wherein the second amplifier outputs the receive signal with the reduced transmit signal components; and a digitall signal processing system that isolates the transmit signal from the receive signal, including; a first input receiving the combined output signal from the first amplifier; a second input receiving the receive signal from the external device having the transmit signal comnonents; an output outputting the receive signal with the reduced transmit signal components to the first and second amplifiers; and a third input receiving the receive signal with the reduced transmit signal components back from the second amplifier. - View Dependent Claims (2, 3, 4, 5)
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6. A method for providing full-duplex communications in an earpiece, comprising:
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convening an audio input into an analog transmit signal in an interface circuit in the earpiece; receiving an analog receive signal intended for a user from an external device, the receive signal having transmit signal components, in a digital signal processing system; outputting a receive signal having reduced transmit signal components from the digital signal processing system to the interface circuit in the earpiece; converting the receive signal having reduced transmit signal comnonents into an audio output in the interface circuit in the earpiece; feeding the same receive signal having reduced transmit signal components outputted to the interface circuit back to the digital signal processing system; generating a combined output signal that includes the transmit signal and the receive signal having reduced transmit signal components; and cancelling the receive signal having reduced transmit signal components from the combined output sianal in the digital signal processing system. - View Dependent Claims (7, 8, 9)
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10. An audio device, comprising:
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first and second earpieces, each having a transducer for converting an audio input into an electrical transmit signal and converting an analog receive signal received from an external device and intended for outputting to a user into an audio output, wherein the first transducer operates as a speaker and the second transducer operates either in a microphone mode or in a speaker mode; a switching circuit adapted to select the operational mode of the second transducer; and a full-duplex transmit and receive circuit, comprising; a first amplifier having a first input coupled to the positive terminal of the transducer in the first earpiece and an output coupled to a transmit signal output; a second amplifier having a first input coupled to the negative terminal of the transducer in the second earpiece and an output coupled to the transmit signal output; and a third amplifier coupled between the outputs of the first and second amplifiers and the transmit signal output. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification