Microphone Interference Detection Method and Apparatus
First Claim
1. A method for detecting microphone interference comprising:
- receiving a first microphone signal from a first microphone;
receiving a second microphone signal from a second microphone;
filtering the first microphone signal to produce a first low-frequency-band signal;
filtering the second microphone signal to produce a second low-frequency-band signal;
calculating a low-frequency-band energy value from the first low-frequency-band signal and the second low-frequency-band signal when the first low-frequency-band signal'"'"'s magnitude is above a first predetermined threshold and the second low-frequency band signal'"'"'s magnitude is above a second predetermined threshold; and
producing a first output signal indicating microphone wind noise when the low-frequency-band energy value exceeds a predetermined low-frequency-band energy threshold.
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Abstract
A method and apparatus for detecting microphone interference includes first and second built-in microphones producing first and second microphone signals. A first filter bank creates first high-frequency-band and first low-frequency-band signals from the first microphone signal. A second filter bank creates second high-frequency-band and second low-frequency-band signals from the second microphone signal. A first measurement calculator determines a high-frequency-band energy value from the first high-frequency-band signal and the second high-frequency-band signal when the first and second high-frequency-band signals'"'"' magnitudes exceeds predetermined thresholds. A second measurement calculator calculates a low-frequency-band energy value from the first low-frequency-band signal and the second low-frequency-band signal when the first and second low-frequency-band signals'"'"' magnitudes exceed predetermined thresholds. A logic control block, coupled to the first measurement calculator and the second measurement calculator, detects microphone interference and produces an output signal indicating microphone occlusion or wind noise.
126 Citations
20 Claims
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1. A method for detecting microphone interference comprising:
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receiving a first microphone signal from a first microphone; receiving a second microphone signal from a second microphone; filtering the first microphone signal to produce a first low-frequency-band signal; filtering the second microphone signal to produce a second low-frequency-band signal; calculating a low-frequency-band energy value from the first low-frequency-band signal and the second low-frequency-band signal when the first low-frequency-band signal'"'"'s magnitude is above a first predetermined threshold and the second low-frequency band signal'"'"'s magnitude is above a second predetermined threshold; and producing a first output signal indicating microphone wind noise when the low-frequency-band energy value exceeds a predetermined low-frequency-band energy threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus for detecting microphone interference comprising:
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a first built-in microphone; a second built-in microphone; a first filter bank, coupled to the first built-in microphone, for creating a first high-frequency-band signal and a first low-frequency-band signal; a second filter bank, coupled to the second built-in microphone, for creating a second high-frequency-band signal and second low-frequency-band signal; a first threshold block, coupled to the first filter bank, for determining when the first high-frequency-band signal'"'"'s magnitude exceeds a predetermined first threshold; a second threshold block, coupled to the second filter bank, for determining when the second high-frequency-band signal'"'"'s magnitude exceeds a predetermined second threshold; a third threshold block, coupled to the first filter bank, for determining when the first low-frequency-band signal'"'"'s magnitude exceeds a predetermined third threshold; a fourth threshold block, coupled to the second filter bank, for determining when the second low-frequency-band signal'"'"'s magnitude exceeds a predetermined fourth threshold; a first measurement calculator, coupled to the first threshold block and the second threshold block, for calculating a high-frequency-band energy value from the first high-frequency-band signal and the second high-frequency-band signal when the first high-frequency-band signal'"'"'s magnitude exceeds the predetermined first threshold and the second high-frequency-band signal'"'"'s magnitude exceeds the predetermined second threshold; a second measurement calculator, coupled to the first threshold block and the second threshold block, for calculating a low-frequency-band energy value from the first low-frequency-band signal and the second low-frequency-band signal when the first low-frequency-band signal'"'"'s magnitude exceeds the predetermined third threshold and the second low-frequency-band signal'"'"'s magnitude exceeds the predetermined fourth threshold; and a logic control block, coupled to the first measurement calculator and the second measurement calculator, for detecting microphone interference and producing an output signal indicating microphone occlusion or wind noise. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification