Detecting unwanted audio signal components by comparing signals processed with differing linearity
First Claim
1. A method for determining the presence of unwanted signal components in an acoustic signal, comprising:
- receiving a first microphone signal derived from an acoustic signal,applying the first microphone signal to a first signal processing path having a first transfer function to provide a first output,receiving a second microphone signal derived from the acoustic signal,applying the second microphone signal to a second signal processing path having a second transfer function to provide a second output,configuring the first and second signal processing paths such that the second transfer function has a greater linear range of operation than the first transfer function, anddetermining the presence of unwanted signal components in the acoustic signal based on a comparison of the first output and the second output,wherein the first and second signal processing paths each comprise an analog gain element and a digital gain element, and wherein configuring the first and second signal processing paths comprises setting total gain values of the first and second signal processing paths to be equal, and setting a gain value of the analog gain element in the first signal processing path to be higher than a gain value of the analog gain element in the second signal processing path.
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Abstract
A method for determining the presence of unwanted signal components in an acoustic signal, comprises: receiving a first microphone signal derived from an acoustic signal, applying the first microphone signal to a first signal processing path having a first transfer function to provide a first output, receiving a second microphone signal derived from the acoustic signal, applying the second microphone signal to a second signal processing path having a second transfer function to provide a second output, wherein the second transfer function has a different degree of linearity from the first transfer function, and determining the presence of unwanted signal components in the acoustic signal based on a comparison of the first output and the second output.
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Citations
17 Claims
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1. A method for determining the presence of unwanted signal components in an acoustic signal, comprising:
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receiving a first microphone signal derived from an acoustic signal, applying the first microphone signal to a first signal processing path having a first transfer function to provide a first output, receiving a second microphone signal derived from the acoustic signal, applying the second microphone signal to a second signal processing path having a second transfer function to provide a second output, configuring the first and second signal processing paths such that the second transfer function has a greater linear range of operation than the first transfer function, and determining the presence of unwanted signal components in the acoustic signal based on a comparison of the first output and the second output, wherein the first and second signal processing paths each comprise an analog gain element and a digital gain element, and wherein configuring the first and second signal processing paths comprises setting total gain values of the first and second signal processing paths to be equal, and setting a gain value of the analog gain element in the first signal processing path to be higher than a gain value of the analog gain element in the second signal processing path. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for determining the presence of unwanted signal components in an acoustic signal, comprising:
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receiving a first microphone signal derived from an acoustic signal, applying the first microphone signal to a first signal processing path having a first transfer function to provide a first output, receiving a second microphone signal derived from the acoustic signal, applying the second microphone signal to a second signal processing path having a second transfer function to provide a second output, configuring the first and second signal processing paths such that the second transfer function has a greater linear range of operation than the first transfer function, and determining the presence of unwanted signal components in the acoustic signal based on a comparison of the first output and the second output, wherein the first and second signal processing paths comprise at least one signal processing component having nonlinear characteristics, wherein configuring the first and second signal processing paths comprises adjusting the operation of at least one signal processing component having nonlinear characteristics. - View Dependent Claims (8, 9)
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10. A method for determining the presence of unwanted signal components in an acoustic signal, comprising:
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receiving a first microphone signal derived from an acoustic signal, applying the first microphone signal to a first signal processing path having a first transfer function to provide a first output, receiving a second microphone signal derived from the acoustic signal, applying the second microphone signal to a second signal processing path having a second transfer function to provide a second output, configuring the first and second signal processing paths such that the second transfer function has a greater linear range of operation than the first transfer function, and determining the presence of unwanted signal components in the acoustic signal based on a comparison of the first output and the second output, wherein configuring the first and second signal processing paths comprises at least one of; applying different supply voltages to the first and second signal processing paths; and applying a DC offset to one of the first and second signal processing paths.
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11. An analog front end, comprising:
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a first signal processing path for receiving a first microphone signal derived from an acoustic signal, wherein the first signal processing path has a first transfer function and provides a first output, a second signal processing path for receiving a second microphone signal derived from the acoustic signal, wherein the second signal processing path has a second transfer function and provides a second output, and a comparator for determining a presence of unwanted signal components in the acoustic signal based on a comparison of the first output and the second output; wherein; the first and second signal processing paths are configurable such that the second transfer function has a greater linear range of operation than the first transfer function; and the first and second signal processing paths each comprise an analog gain element and a digital gain element, and wherein the first and second signal processing paths are configurable by setting total gain values of the first and second signal processing paths to be equal, and setting a gain value of the analog gain element in the first signal processing path to be higher than a gain value of the analog gain element in the second signal processing path. - View Dependent Claims (12, 13)
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14. An analog front end, comprising:
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a first signal processing path for receiving a first microphone signal derived from an acoustic signal, wherein the first signal processing path has a first transfer function and provides a first output, a second signal processing path for receiving a second microphone signal derived from the acoustic signal, wherein the second signal processing path has a second transfer function and provides a second output, and a comparator for determining a presence of unwanted signal components in the acoustic signal based on a comparison of the first output and the second output; wherein; the first and second signal processing paths are configurable such that the second transfer function has a greater linear range of operation than the first transfer function; and the first and second signal processing paths comprise at least one signal processing component having nonlinear characteristics, wherein configuring the first and second signal processing paths comprises adjusting the operation of at least one signal processing component having nonlinear characteristics. - View Dependent Claims (15, 16)
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17. An analog front end, comprising:
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a first signal processing path for receiving a first microphone signal derived from an acoustic signal, wherein the first signal processing path has a first transfer function and provides a first output, a second signal processing path for receiving a second microphone signal derived from the acoustic signal, wherein the second signal processing path has a second transfer function and provides a second output, and a comparator for determining a presence of unwanted signal components in the acoustic signal based on a comparison of the first output and the second output; wherein; the first and second signal processing paths are configurable such that the second transfer function has a greater linear range of operation than the first transfer function; and configuring the first and second signal processing paths comprises at least one of; applying different supply voltages to the first and second signal processing paths; and applying a DC offset to one of the first and second signal processing paths.
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Specification