Systems and methods for half-duplex speakerphones and other two-way communication devices
First Claim
1. An apparatus for use with a two-way communication device, comprising:
- a half-duplexer comprising;
a receive attenuator configured to provide a first output signal by scaling a first input signal received from a first input;
a transmit attenuator configured to provide a second output signal by scaling a second input signal received from a second input; and
a digital logic module configured to provide a first control signal to the receive attenuator to control a manner in which the receive attenuator scales the first input signal, and configured to provide a second control signal to the transmit attenuator to control a manner in which the transmit attenuator scales the second input signal; and
a calibration module configured to send a test signal on an output connection, to measure an echo signal received on an input connection in response to the test signal, and to adjust a threshold value based on the measured echo signal.
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Abstract
An apparatus to enable half-duplexing capabilities in a two-way communication device is disclosed. The apparatus estimates the signal power and background noise of a first input signal and a second input signal during approximately the same period. The apparatus further provides at least one control signal based on the result of one or more determinations. These determinations may include whether the estimated signal power of at least one of the first and second input signals exceeds a threshold value; whether the estimated signal power of the first input signal exceeds the sum of a first threshold value and the estimated background noise of the first input signal; and whether the estimated signal power of the second input signal exceeds the sum of a second threshold value and the estimated background noise of the second input signal. Other embodiments for use with two-way communication devices and related methods are also disclosed.
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Citations
20 Claims
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1. An apparatus for use with a two-way communication device, comprising:
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a half-duplexer comprising; a receive attenuator configured to provide a first output signal by scaling a first input signal received from a first input; a transmit attenuator configured to provide a second output signal by scaling a second input signal received from a second input; and a digital logic module configured to provide a first control signal to the receive attenuator to control a manner in which the receive attenuator scales the first input signal, and configured to provide a second control signal to the transmit attenuator to control a manner in which the transmit attenuator scales the second input signal; and a calibration module configured to send a test signal on an output connection, to measure an echo signal received on an input connection in response to the test signal, and to adjust a threshold value based on the measured echo signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A non-transitory processor readable medium comprising instructions that when executed on a processor perform a method for providing half-duplex functionality in a two-way communication device, wherein the method comprises:
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estimating the signal power and background noise of a first input signal during a period; estimating the signal power and background noise of a second input signal during approximately the same period; providing at least one control signal based on the result of at least one of the following determinations; whether the estimated signal power of at least one of the first and second input signals exceeds a threshold value; whether the estimated signal power of the first input signals exceeds the sum of a first threshold value and the estimated background noise of the first input signal; and whether the estimated signal power of the second input signal exceeds the sum of a second threshold value and the estimated background noise of the second input signal, and wherein the steps of estimating signal power and background noise and providing at least one control signal based on the result of at least one determination are performed by a digital signal processor. - View Dependent Claims (15, 16, 17)
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18. An apparatus for use with a two-way communication device, comprising:
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means for estimating the signal power and background noise of a first input signal during a period; means for estimating the signal power and background noise of a second input signal during approximately the same period; means for providing at least one control signal based on the result of at least one of the following determinations; whether the estimated signal power of at least one of the first and second input signals exceeds a threshold value; whether the estimated signal power of the first input signal exceeds the sum of a first threshold value and the estimated background noise of the first input signal; and whether the estimated signal power of the second input signal exceeds the sum of a second threshold value and the estimated background noise of the second input signal. - View Dependent Claims (19, 20)
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Specification