PROXIMITY FILTER
First Claim
1. A device for enhancing a target audio signal originating proximate to the device, comprising:
- a first microphone;
a second microphone, the first and the second microphones having receiving surfaces facing different directions, the device configured to enhance the target audio signal by sensing an acoustic pressure gradient across the first microphone and the second microphone, the device further configured to suppress an undesired noise signal not originating in a proximity of the device.
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Accused Products
Abstract
An audio signal enhancement device is provided. The device includes a first and a second microphone, placed as close together as possible, the first and second microphone having receiving surfaces facing in opposing directions. The first and second microphones receive a desired target audio signal originating in the proximity of the microphones and undesired noise signals not originating in the proximity of the microphones. The acoustic pressure gradient from the desired target signal between the first and the second microphones is greater than that from the noise signals. A signal processing logic is provided. The signal processing logic is configured to firstly generate a proximity-indicator signal and a pre-target-estimate signal through a combination of output from the first microphone and output of the second microphone. The signal processing logic is further configured to generate a noise-estimate signal by combining the output from the first microphone with the proximity-indicator and the pre-target-estimate. The signal processing logic is further configured to generate a target-estimate signal by combining the output from the first microphone with the proximity-indicator and the noise-estimate. The signal processing logic is further configured to provide a target signal substantially free from noise by combining the target-estimate, noise-estimate and the proximity-indicator.
39 Citations
42 Claims
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1. A device for enhancing a target audio signal originating proximate to the device, comprising:
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a first microphone; a second microphone, the first and the second microphones having receiving surfaces facing different directions, the device configured to enhance the target audio signal by sensing an acoustic pressure gradient across the first microphone and the second microphone, the device further configured to suppress an undesired noise signal not originating in a proximity of the device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method for enhancing a target audio signal portion of an audio signal where the target audio signal portion originates proximate to the device, comprising:
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measuring an acoustic pressure gradient across a first sensor and a second sensor; identifying the target signal portion based on the acoustic pressure gradient across the first and second sensors; and identifying noise within the audio signal based on the acoustic pressure gradient across the first and second sensors, the acoustic pressure gradient across the first and second sensors for the noise is diminished relative to the acoustic pressure gradient across the first and second sensors for the target signal portion. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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Specification