Active noise cancellation in hearing devices
First Claim
1. A hearing device system, comprising:
- at least one hearing aid circuitry includingat least one input transducer adapted to convert a first audio signal to an electric audio signal,a signal processor connected to the at least one input transducer and configured to process said electric audio signal by at least partially correcting for a hearing loss of a user, thereby generating a processed electric audio signal, andan output transducer configured to generate from at least said processed electric audio signal a sound pressure in an ear canal of the user, wherein the generated sound pressure is at least partially corrected for the hearing loss of the user;
at least one active noise cancellation unit configured to cancel an acoustic signal bypassing the hearing device positioned in the ear canal by providing an active noise cancellation signal, the at least one active noise cancellation unit including an active noise cancellation filter;
a feed-back cancellation unit configured to estimate an acoustical feedback path from the output transducer to the at least one input transducer and to adjust filter characteristics of the active noise cancellation filter in the at least one active noise cancellation unit; and
a combiner unit configured to combine the processed electric audio signal with the active noise cancellation signal, to obtain a combined signal and to provide the combined signal to the output transducer.
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Accused Products
Abstract
Disclosed is a hearing device system comprising at least one hearing aid circuitry and at least one active noise cancellation unit, the at least one hearing aid circuitry comprises at least one input transducer adapted to convert a first audio signal to an electric audio signal; a signal processor connected to the at least one input transducer and adapted to process said electric audio signal by at least partially correcting for a hearing loss of a user; an output transducer adapted to generate from at least said processed electric audio signal a sound pressure in an ear canal of the user, whereby the generated sound pressure is at least partially corrected for the hearing loss of the user; the at least one active noise cancellation unit being adapted to provide an active noise cancellation signal adapted to perform active noise cancellation of an acoustical signal entering the ear canal in addition to said generated sound pressure, wherein the hearing device system further comprises a combiner unit adapted to combine the processed electric audio signal with the active noise cancellation signal, to obtain a combined signal and to provide the combined signal to the output transducer.
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Citations
19 Claims
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1. A hearing device system, comprising:
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at least one hearing aid circuitry including at least one input transducer adapted to convert a first audio signal to an electric audio signal, a signal processor connected to the at least one input transducer and configured to process said electric audio signal by at least partially correcting for a hearing loss of a user, thereby generating a processed electric audio signal, and an output transducer configured to generate from at least said processed electric audio signal a sound pressure in an ear canal of the user, wherein the generated sound pressure is at least partially corrected for the hearing loss of the user; at least one active noise cancellation unit configured to cancel an acoustic signal bypassing the hearing device positioned in the ear canal by providing an active noise cancellation signal, the at least one active noise cancellation unit including an active noise cancellation filter; a feed-back cancellation unit configured to estimate an acoustical feedback path from the output transducer to the at least one input transducer and to adjust filter characteristics of the active noise cancellation filter in the at least one active noise cancellation unit; and a combiner unit configured to combine the processed electric audio signal with the active noise cancellation signal, to obtain a combined signal and to provide the combined signal to the output transducer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of improving noise cancellation in a hearing device system, comprising:
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converting a first audio signal to an electric audio signal by an input transducer; processing the electric audio signal by at least partially correcting for a hearing loss of a user by a signal processor; generating from at least said processed electric audio signal a sound pressure in an ear canal of the user by an output transducer, wherein the generated sound pressure is at least partially corrected for the hearing loss of the user; providing an active noise cancellation signal adapted to perform active noise cancellation of an acoustical signal bypassing the hearing device positioned in the ear canal of the user by at least one active noise cancellation unit including an active noise cancellation filter; estimating an acoustical feedback path from the output transducer to the input transducer by a feed-back cancellation unit; adjusting filter characteristics of the active noise cancellation filter in the at least one active noise cancellation unit by the feed-back cancellation unit; and combining the processed electric audio signal with the active noise cancellation signal by a combiner unit to obtain a combined signal and providing the combined signal to the output transducer.
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Specification