Microphone array with rear venting
First Claim
Patent Images
1. A device comprising:
- a headset including a housing;
a loudspeaker connected to the housing;
a first microphone connected to a first side of the housing, the housing having a first front vent opening configured to provide the first microphone with access to speech, the first microphone having a first rear port configured to receive a first pressure in response to a source signal;
a second microphone connected to a second side of the housing, the housing having a second front vent opening configured to provide the second microphone with access to speech, the second microphone having a second rear port configured to receive a second pressure in response to the source signal, the first pressure being substantially equal to the second pressure;
a shared-vent configuration positioned in an interior region of the housing and including a vent cavity that forms a common rear port of the first microphone and the second microphone, the vent cavity having a volume that is small relative to a wavelength of acoustic signals received by the first and second microphones; and
an adaptive filter configured to receive a first signal from the first microphone and a second signal from the second microphone.
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Accused Products
Abstract
Microphone arrays (MAs) are described that position and vent microphones so that performance of a noise suppression system coupled to the microphone array is enhanced. The MA includes at least two physical microphones to receive acoustic signals. The physical microphones make use of a common rear vent (actual or virtual) that samples a common pressure source. The MA includes a physical directional microphone configuration and a virtual directional microphone configuration. By making the input to the rear vents of the microphones (actual or virtual) as similar as possible, the real-world filter to be modeled becomes much simpler to model using an adaptive filter.
224 Citations
48 Claims
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1. A device comprising:
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a headset including a housing; a loudspeaker connected to the housing; a first microphone connected to a first side of the housing, the housing having a first front vent opening configured to provide the first microphone with access to speech, the first microphone having a first rear port configured to receive a first pressure in response to a source signal; a second microphone connected to a second side of the housing, the housing having a second front vent opening configured to provide the second microphone with access to speech, the second microphone having a second rear port configured to receive a second pressure in response to the source signal, the first pressure being substantially equal to the second pressure; a shared-vent configuration positioned in an interior region of the housing and including a vent cavity that forms a common rear port of the first microphone and the second microphone, the vent cavity having a volume that is small relative to a wavelength of acoustic signals received by the first and second microphones; and an adaptive filter configured to receive a first signal from the first microphone and a second signal from the second microphone. - 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, 24, 25, 26, 46)
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27. A device comprising:
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a housing that is portable and attaches to a region of a human head; a loudspeaker connected to the housing; a first microphone connected to the housing, the housing having a first front vent opening configured to provide the first microphone with access to speech, the first microphone having a first rear port configured to receive a first pressure in response to a source signal; a second microphone connected to the housing, the housing having a second front vent opening configured to provide the second microphone with access to speech, the second microphone having a second rear port configured to receive a second pressure in response to the source signal, the first pressure being substantially equal to the second pressure; a shared-vent configuration positioned in an interior region of the housing and including a vent cavity positioned behind the first microphone and the second microphone, the vent cavity having a volume that is small relative to a wavelength of acoustic signals received by the first and second microphones; and an adaptive filter configured to receive a first signal from the first microphone and a second signal from the second microphone. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 47)
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42. A device comprising:
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a headset comprising a housing that attaches to a human head; a first microphone connected to a first side of the housing, the housing having a first front vent opening configured to provide the first microphone with access to speech, the first microphone having a first rear port configured to receive a first pressure in response to a source signal; a second microphone connected to a second side of the housing, the housing having a second front vent opening configured to provide the second microphone with access to speech, the second microphone having a second rear port configured to receive a second pressure in response to the source signal, the first pressure being substantially equal to the second pressure; a shared-vent configuration positioned in an interior region of the housing and including a vent cavity that is connected with a first rear port of the first microphone and a second rear port of the second microphone, the vent cavity having a volume that is small relative to a wavelength of acoustic signals received by the first and second microphones; and an adaptive filter configured to receive a first signal from the first microphone and a second signal from the second microphone. - View Dependent Claims (43, 44, 45, 48)
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Specification