Active cancellation hearing assistance device
First Claim
1. A method for cancelling interference received by a hearing assistive device, comprising:
- receiving a composite signal containing a desired signal and interference;
activating a cancellation circuit, including;
storing at least one interference profile in a memory;
receiving a composite signal;
monitoring at least one signal parameter of the received composite signal;
detecting a repetitive signal component of the composite signal;
accessing the at least one stored interference profile;
comparing the repetitive signal component to the at least one stored interference profile; and
activating the cancellation circuit if the comparison of the repetitive signal component to the at least one stored interference profile satisfies a predetermined condition;
the cancellation circuit generating a replica waveform of the interference;
the cancellation circuit creating a cancellation waveform derived from the replica waveform; and
the cancellation circuit adding the cancellation waveform to the composite signal to produce an interference-cancelled signal.
1 Assignment
0 Petitions
Accused Products
Abstract
An apparatus and method for active cancellation of interference at a hearing assistive devices are presented. The apparatus includes an interference cancellation circuit for cancelling an interference component of a composite signal, and an activator circuit for enabling interference cancellation circuit. The interference cancellation circuit generates an estimated replica of the interference from an interference profile, inverts the replica to form a cancellation waveform, then adds the cancellation waveform to the composite signal to cancel the interference component. An interference profile can be provided by performing a training sequence on a composite signal to detect a repetitive signal and building a profile using its parameters, retrieving a profile stored in memory, or using an antenna to capture an RF signal. The activator circuit may enable the interference cancellation circuit when RF energy is detected, when composite signal characteristics match one or more stored profiles, or in response to user input.
37 Citations
36 Claims
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1. A method for cancelling interference received by a hearing assistive device, comprising:
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receiving a composite signal containing a desired signal and interference; activating a cancellation circuit, including; storing at least one interference profile in a memory; receiving a composite signal; monitoring at least one signal parameter of the received composite signal; detecting a repetitive signal component of the composite signal; accessing the at least one stored interference profile; comparing the repetitive signal component to the at least one stored interference profile; and activating the cancellation circuit if the comparison of the repetitive signal component to the at least one stored interference profile satisfies a predetermined condition; the cancellation circuit generating a replica waveform of the interference; the cancellation circuit creating a cancellation waveform derived from the replica waveform; and the cancellation circuit adding the cancellation waveform to the composite signal to produce an interference-cancelled signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for cancelling interference in a hearing assistive device, comprising:
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an interference cancellation circuit including; at least one interference profile provider; an interference processor configured to receive an interference profile from the at least one interference profile provider and generate an interference replica; an inverter configured to invert the interference replica to produce a cancellation waveform; and a summer to combine the cancellation waveform and a composite signal comprising a desired signal and undesired interference, to produce an interference-cancelled signal; and an activator circuit configured to enable the interference cancellation circuit, wherein the activator circuit includes; an activator-circuit memory configured to store interference profiles; and a controller in communication with the activation-circuit memory and configured to receive a composite signal, compare the composite signal to at least one interference profile stored in the activation-circuit memory, and activate the cancellation circuit if the comparison satisfies a predetermined condition. - View Dependent Claims (11, 12, 13, 14)
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15. A system for cancelling interference in a hearing assistive device, comprising:
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an interference cancellation circuit configured to produce an interference-cancelled waveform; and an activator circuit configured to enable the interference cancellation circuit, the activator circuit including; an activator-circuit memory configured to store interference profiles; and a controller in communication with the activator-circuit memory and configured to; receive a composite signal including a desired signal and an undesired signal; and compare the composite signal to at least one interference profile stored in the activator-circuit memory, and activate the cancellation circuit if the comparison satisfies a predetermined condition. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An apparatus for cancelling interference at a hearing assistive device comprising:
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at least one signal input device; a central processor in communication with the at least one signal input device and configured to receive a composite signal including a desired component and an interference component; an interference cancellation circuit in communication with the central processor, configured to receive the composite signal, replicate the interference component of the composite signal, and output an interference-cancelled signal; and an activator circuit in communication with the central processor and configured to activate the interference cancellation circuit, the activator circuit including; an activator-circuit memory configured to store at least one predetermined interference profile; and a controller in communication with the memory, the controller being configured to; receive a composite signal; compare the composite signal to the at least one interference profile stored in the memory; and activate the cancellation circuit if the comparison satisfies a predetermined condition. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification