ADAPTIVE ROOM EQUALIZATION USING A SPEAKER AND A HANDHELD LISTENING DEVICE
First Claim
1. A method for adjusting sound emitted by a loudspeaker in a room, comprising:
- driving one or more transducers to emit sounds based on a first segment of an audio signal;
characterizing the spectral characteristics of the first segment;
receiving, by the loudspeaker, a sensed audio signal from a handheld device, wherein the sensed audio signal represents the sounds emitted by the one or more transducers corresponding to the first segment of the audio signal;
estimating, by an adaptive filter, an impulse response for the room based on the first segment of the audio signal;
determining an error value for the estimated impulse response based on the sensed audio signal;
storing the impulse response and the spectral characteristics of the first segment in response to the error value being below a predefined error level and the impulse response being within a tolerance level of one or more previously stored impulse responses; and
processing a second segment of the audio signal based on one or more stored impulse responses in response to determining the stored spectral characteristics corresponding to the one or more stored impulse responses cover a predefined spectrum.
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Accused Products
Abstract
A loudspeaker that measures the impulse response of a listening area is described. The loudspeaker may output sounds corresponding to a segment of an audio signal. The sounds are sensed by a listening device proximate to a listener and transmitted to the loudspeaker. The loudspeaker includes an adaptive filter that estimates the impulse response of the listening area based on the signal segment. An error unit analyzes the estimated impulse response together with the sensed audio signal received from the listening device to determine the accuracy of the estimate. New estimates may be generated by the adaptive filter until an accuracy level is achieved for the signal segment. A processor may utilize one or more estimated impulse responses corresponding to various signal segments that cover a defined frequency spectrum for adjusting the audio signal to compensate for the impulse response of the listening area. Other embodiments are also described.
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Citations
23 Claims
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1. A method for adjusting sound emitted by a loudspeaker in a room, comprising:
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driving one or more transducers to emit sounds based on a first segment of an audio signal; characterizing the spectral characteristics of the first segment; receiving, by the loudspeaker, a sensed audio signal from a handheld device, wherein the sensed audio signal represents the sounds emitted by the one or more transducers corresponding to the first segment of the audio signal; estimating, by an adaptive filter, an impulse response for the room based on the first segment of the audio signal; determining an error value for the estimated impulse response based on the sensed audio signal; storing the impulse response and the spectral characteristics of the first segment in response to the error value being below a predefined error level and the impulse response being within a tolerance level of one or more previously stored impulse responses; and processing a second segment of the audio signal based on one or more stored impulse responses in response to determining the stored spectral characteristics corresponding to the one or more stored impulse responses cover a predefined spectrum. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A loudspeaker, comprising:
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a transducer for emitting sounds corresponding to a first segment of an audio signal; a wireless controller for receiving a sensed audio signal from a listening device, wherein the sensed audio signal represents the sounds emitted by the transducer corresponding to the first segment of the audio signal an adaptive filter for estimating an impulse response of a room in which the loudspeaker is located based on the first segment of the audio signal; an error unit for determining an error value for the estimated impulse response of the room based on the sensed audio signal, wherein the adaptive filter stores the impulse response and spectral characteristics of the first segment in response to the error value being below a predefined error level and the impulse response being within a tolerance level of one or more previously stored impulse responses; and a content processor for processing a second segment of the audio signal based on one or more stored impulse responses in response to determining the stored spectral characteristics corresponding to the one or more stored impulse responses cover a predefined spectrum. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. An article of manufacture for adjusting sound emitted by a loudspeaker in a room, comprising:
a machine-readable storage medium that stores instructions which, when executed by a processor in a computer, characterize the spectral characteristics of the first segment; receive by the loudspeaker, a sensed audio signal from a handheld device, wherein the sensed audio signal represents the sounds emitted by the one or more transducers corresponding to the first segment of the audio signal; estimate, by an adaptive filter, an impulse response for the room based on the first segment of the audio signal; determine an error value for the estimated impulse response based on the sensed audio signal; store the impulse response and the spectral characteristics of the first segment in response to the error value being below a predefined error level and the impulse response being within a tolerance level of one or more previously stored impulse responses; and process a second segment of the audio signal based on one or more stored impulse responses in response to determining the stored spectral characteristics corresponding to the one or more stored impulse responses cover a predefined spectrum. - View Dependent Claims (18, 19, 20, 21, 22, 23)
Specification