CO-TALKER NULLING FOR AUTOMATIC SPEECH RECOGNITION SYSTEMS
First Claim
1. In a vehicle having a driver and a passenger and first and second microphones, which are spatially separated from each other by a distance of at least twelve inches, both microphones being capable of detecting sounds from both the passenger and driver, a method for selectively detecting sounds from the driver and suppressing sounds from the passenger, the method comprising:
- selectively detecting at a first microphone, a first sample of a sound from the driver, the first sample of the sound from the driver comprising a first frequency component, the first sample of the sound from the driver being a sample of the first frequency component at a first phase angle;
selectively detecting at a second microphone, a second sample of the sound from the driver, the second sample of the sound from the driver comprising the first frequency component, said second sample being a sample of the first frequency component at a second phase angle;
storing the first sample for a first predetermined length of time to provide a delayed first sample, the first predetermined length of time selected such that the phase angles of the delayed first sample and second phase angle are substantially equal to each other; and
combining the delayed first sample and the second sample.
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Accused Products
Abstract
Speech from a driver and speech from a passenger in a vehicle is selected directionally using two or more microphones. Samples of speech from a driver and picked up by a first microphone are delayed until samples of the speech picked up by a second microphone is in phase with the speech picked up by the first microphone. Samples of a passenger'"'"'s speech and picked up by the second microphone are delayed until samples of the passenger'"'"'s speech picked up by the first microphone are out-of-phase with the speech picked up by the second microphone.
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Citations
12 Claims
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1. In a vehicle having a driver and a passenger and first and second microphones, which are spatially separated from each other by a distance of at least twelve inches, both microphones being capable of detecting sounds from both the passenger and driver, a method for selectively detecting sounds from the driver and suppressing sounds from the passenger, the method comprising:
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selectively detecting at a first microphone, a first sample of a sound from the driver, the first sample of the sound from the driver comprising a first frequency component, the first sample of the sound from the driver being a sample of the first frequency component at a first phase angle; selectively detecting at a second microphone, a second sample of the sound from the driver, the second sample of the sound from the driver comprising the first frequency component, said second sample being a sample of the first frequency component at a second phase angle; storing the first sample for a first predetermined length of time to provide a delayed first sample, the first predetermined length of time selected such that the phase angles of the delayed first sample and second phase angle are substantially equal to each other; and combining the delayed first sample and the second sample. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for a vehicle having a driver and a passenger and first and second microphones, which are spatially separated from each other by a distance of at least twelve inches, both microphones being capable of detecting sounds from both the passenger and driver, the apparatus configured to selectively detect sounds from the driver and suppress sounds from the passenger, the apparatus comprising:
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a digital signal processor; a non-transitory memory device coupled to the digital signal processor and storing program instructions, which when executed cause the digital signal processor to; selectively detect at a first microphone, a first sample of a sound from the driver, the first sample of the sound from the driver comprising a first frequency component, the first sample of the sound from the driver being a sample of the first frequency component at a first phase angle; selectively detect at a second microphone, a second sample of the sound from the driver, the second sample of the sound from the driver comprising the first frequency component, said second sample being a sample of the first frequency component at a second phase angle; store the first sample for a first predetermined length of time to provide a delayed first sample, the first predetermined length of time selected such that the phase angles of the delayed first sample and second phase angle are substantially equal to each other; and combine the delayed first sample and the second sample. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification