FREQUENCY-DEPENDENT SIDETONE CALIBRATION
First Claim
1. A system, comprising:
- a first microphone for receiving speech and generating a first microphone signal;
a sidetone circuit for generating a sidetone signal from the first microphone signal, wherein the sidetone circuit has at least one adjustable coefficient for altering a relationship between the first microphone signal and the sidetone signal;
a transducer for reproducing downlink audio and the sidetone signal at an ear of a listener;
a second microphone for measuring an output of the transducer as delivered to the ear of the listener and generating a second microphone signal; and
a calibration circuit for estimating a response of the second microphone signal to the sidetone signal and adjusting the adjustable coefficient of the sidetone circuit in conformity with the estimated response.
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Accused Products
Abstract
A personal audio device includes a sidetone circuit with one or more adjustable coefficients that generates a sidetone signal from the output of a first microphone. The sidetone circuit has one or more adjustable coefficients for altering the relationship between the first microphone signal and the sidetone signal. The personal audio device also includes a transducer for reproducing playback audio and the sidetone signal at an ear of a listener and a second microphone for measuring the output of the transducer as delivered to the ear of the listener. The sidetone circuit includes a calibration circuit for estimating a response of the second microphone to the sidetone signal and adjusting the coefficient of the sidetone circuit according to the estimated response.
43 Citations
25 Claims
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1. A system, comprising:
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a first microphone for receiving speech and generating a first microphone signal; a sidetone circuit for generating a sidetone signal from the first microphone signal, wherein the sidetone circuit has at least one adjustable coefficient for altering a relationship between the first microphone signal and the sidetone signal; a transducer for reproducing downlink audio and the sidetone signal at an ear of a listener; a second microphone for measuring an output of the transducer as delivered to the ear of the listener and generating a second microphone signal; and a calibration circuit for estimating a response of the second microphone signal to the sidetone signal and adjusting the adjustable coefficient of the sidetone circuit in conformity with the estimated response. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An integrated circuit, comprising:
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a first input for receiving a first microphone signal containing speech; a sidetone circuit for generating a sidetone signal from the first microphone signal, wherein the sidetone circuit has at least one adjustable coefficient for altering a relationship between the first microphone signal and the sidetone signal; an output for providing an output signal containing downlink audio and the sidetone signal to a transducer for reproduction at an ear of a listener; a second input for receiving a second microphone signal indicative of an output of the transducer as delivered to the ear of the listener; and a calibration circuit for estimating a response of the second microphone signal to the sidetone signal and adjusting the adjustable coefficient of the sidetone circuit in conformity with the estimated response. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method for providing sidetone in a system, the method comprising:
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receiving speech with a first microphone to generate a first microphone signal; generating a sidetone signal from the first microphone signal according to at least one adjustable coefficient for altering a relationship between the first microphone signal and the sidetone signal; reproducing downlink audio and the sidetone signal at an ear of a listener with a transducer; measuring an output of the transducer as delivered to the ear of the listener with a second microphone to generate a second microphone signal; and estimating a response of the second microphone signal to the sidetone signal and adjusting the adjustable coefficient in conformity with the estimated response with a calibration circuit. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25)
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Specification