Detection and suppression of wind noise in microphone signals
First Claim
Patent Images
1. A system, comprising:
- a first transducer with a first directivity index and configured to detect a first audio signal, where the first directivity index is non-zero and the first audio signal has a first power level;
a second transducer with a second directivity index and configured to detect a second audio signal, where the second directivity index is less than the first directivity index and the second audio signal has a second power level;
to a detector configured to output a detection signal based on a comparison of the first power level and the second power level, the detection signal indicating presence of wind noise if the second power level is less than the first power level by a predetermined value, and indicating absence of wind noise if the second power level is not less than the first power level by the predetermined value; and
a signal processor configured to output an output signal from the first audio signal, the second audio signal, or combinations thereof, based on the detection signal where the output signal is generated from a combination of the first audio signal and the second audio signal if the detection signal indicates the presence of wind noise or the detection signal is not output, the combination comprising a portion of the first audio signal above a predetermined frequency and a portion of the second audio signal below the predetermined frequency.
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Abstract
To reliably and consistently detect desirable sounds, a system detects the presence of wind noise based on the power levels of audio signals. A first transducer detects sound originating from a first direction and a second transducer detects sound originating from a second direction. The power levels of the sound are compared. When the power level of the sound received from the second transducer is less than the power level of the sound received from the first transducer by a predetermined value, wind noise may be present. A signal processor may generate an output from one or a combination of the audio signals, based on a wind noise detection.
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Citations
21 Claims
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1. A system, comprising:
- a first transducer with a first directivity index and configured to detect a first audio signal, where the first directivity index is non-zero and the first audio signal has a first power level;
a second transducer with a second directivity index and configured to detect a second audio signal, where the second directivity index is less than the first directivity index and the second audio signal has a second power level;
to a detector configured to output a detection signal based on a comparison of the first power level and the second power level, the detection signal indicating presence of wind noise if the second power level is less than the first power level by a predetermined value, and indicating absence of wind noise if the second power level is not less than the first power level by the predetermined value; and
a signal processor configured to output an output signal from the first audio signal, the second audio signal, or combinations thereof, based on the detection signal where the output signal is generated from a combination of the first audio signal and the second audio signal if the detection signal indicates the presence of wind noise or the detection signal is not output, the combination comprising a portion of the first audio signal above a predetermined frequency and a portion of the second audio signal below the predetermined frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- a first transducer with a first directivity index and configured to detect a first audio signal, where the first directivity index is non-zero and the first audio signal has a first power level;
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8. A system, comprising:
- a first transducer with a first directivity index and configured to detect a first audio signal, where the first directivity index is non-zero and the first audio signal has a first power level;
a second transducer with a second directivity index and configured to detect asecond audio signal, where the second directivity index is less than the first directivity index and the second audio signal has a second power level;
to a detector configured to output a detection signal based on a comparison of the first power level and the second power level, the detection signal indicating presence of wind noise if the second power level is less than the first power level by a predetermined value, and indicating absence of wind noise if the second power level is not less than the first power level by the predetermined value; and
a signal processor configured to output an output signal from the first audio signal, the second audio signal, or combinations thereof, based on the detection signal, where the signal processor comprises a threshold frequency calculator configured to calculate a threshold frequency based on the first power level and the second power level, the threshold frequency calculated such that the second power level is not less than the first power level by the predetermined value in frequencies above the threshold frequency. - View Dependent Claims (9, 10)
- a first transducer with a first directivity index and configured to detect a first audio signal, where the first directivity index is non-zero and the first audio signal has a first power level;
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11. A signal processing method performed on a signal processing system, comprising:
- detecting a first audio signal with a first power level, the first audio signal originating from a specific direction;
detecting a second audio signal with a second power level, the second audio signal originating from any direction;
comparing the first and second power levels within a detector;
outputting a detection signal from the detector indicating presence of wind noise when the second power level is less than the first power level by a predetermined value, or absence of wind noise when the second power level is not less than the first power level by the predetermined value; and
generating an output signal within a signal processor from the first audio signal, the second audio signal, or combinations thereof, based on the detection signal where the output signal is generated from a combination of the first audio signal and the second audio signal when the detection signal indicates the presence of wind noise or the detection signal is not output, the combination comprising a portion of the first audio signal above a predetermined frequency and a portion of the second audio signal below the predetermined frequency. - View Dependent Claims (12, 13, 14, 15)
- detecting a first audio signal with a first power level, the first audio signal originating from a specific direction;
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16. A signal processing method performed on a signal processing system, comprising:
- detecting a first audio signal with a first power level, the first audio signal originating from a specific direction;
detecting a second audio signal with a second power level, the second audio signal originating from any direction;
comparing the first and second power levels within a detector;
outputting a detection signal from the detector indicating presence of wind noise when the second power level is less than the first power level by a predetermined value, or absence of wind noise when the second power level is not less than the first power level by the predetermined value;
generating an output signal within a signal processor from the first audio signal, the second audio signal, or combinations thereof, based on the detection signal calculating a threshold frequency based on the first power level and the second power level, the threshold frequency calculated such that the second power level is not less than the first power level by the predetermined value in frequencies above the threshold frequency. - View Dependent Claims (17, 18)
- detecting a first audio signal with a first power level, the first audio signal originating from a specific direction;
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19. A system, comprising:
- a first transducer configured to detect a first audio signal originating from a specific direction, where the first audio signal has a first power level;
a second transducer configured to detect a second audio signal originating from a second direction, where the second audio signal has a second power level;
a comparator configured to output a detection signal based on a comparison of the first power level and the second power level, the detection signal indicating presence of wind noise if the second power level is less than the first power level by a predetermined value, and indicating absence of wind noise if the second power level is not less than the first power level by the predetermined value; and
an output signal generator configured to generate an output signal from the first audio signal, if the detection signal indicates the absence of wind noise, and from the second audio signal, if the detection signal indicates the presence of wind noise;
where the output signal generator is further configured to generate the output signal from a combination of the first and second audio signals, when the detection signal indicates the presence of wind noise, or if the comparator does not output the detection signal and where the combination comprises a portion of the first audio signal above a predetermined frequency and a portion of the second audio signal below the predetermined frequency. - View Dependent Claims (20)
- a first transducer configured to detect a first audio signal originating from a specific direction, where the first audio signal has a first power level;
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21. A system, comprising:
- a first transducer configured to detect a first audio signal originating from a specific direction, where the first audio signal has a first power level;
a second transducer configured to detect a second audio signal originating from a second direction, where the second audio signal has a second power level;
a comparator configured to output a detection signal based on a comparison of the first power level and the second power level, the detection signal indicating presence of wind noise if the second power level is less than the first power level by a predetermined value, and indicating absence of wind noise if the second power level is not less than the first power level by the predetermined value; and
an output signal generator configured to generate an output signal from the first audio signal, if the detection signal indicates the absence of wind noise, and from the second audio signal, if the detection signal indicates the presence of wind noise a threshold frequency calculator configured to calculate a threshold frequency, and where the output signal generator is further configured to generate the output signal from a combination of the first and second audio signals, the combination comprising a portion of the first audio signal above the threshold frequency and a portion of the second audio signal below the threshold frequency.
- a first transducer configured to detect a first audio signal originating from a specific direction, where the first audio signal has a first power level;
Specification