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US 7,529,377 B2Granted
Loudspeaker with automatic calibration and room equalization
AssigneeKlipsch, LLC
InventorsFawad Nackvi, Jon Douglas Zenor
Life of this patent
Estimating the term…
Abstract
A loudspeaker, such as a subwoofer, is provided which automatically calibrates itself when placed in a room to optimize an output signal of the loudspeaker for the room in which the loudspeaker is placed.
Claims35
A method of improving sound quality of a loudspeaker in a room, the method comprising:
- providing a reference frequency response signal indicating a desired frequency response for the loudspeaker;
- measuring a frequency response of an output of the loudspeaker in the room;
- comparing the measured frequency response in the room to the reference frequency response signal;
- identifying at least one peak in the measured room frequency response which has a higher sound level than corresponding a sound level of the reference frequency response signal;
- and
- modifying the output of the loudspeaker to reduce the at least one peak identified in the identifying step without adjusting portions of the output of the loudspeaker having sound levels below corresponding sound levels of the reference frequency response signal.
3 more elements
A method of improving sound quality of a loudspeaker in a room, the method comprising:
- providing a reference frequency response signal indicating a desired frequency response for the loudspeaker;
- placing the loudspeaker in the room;
- initiating a chirp sequence over a predetermined frequency range for a predetermined time period greater than 10 seconds;
- detecting sound levels of an output of the loudspeaker at different frequencies within the frequency range during the chirp sequence;
- storing the detected sound levels to provide a measured frequency response of the output of the loudspeaker in the room;
- comparing the measured frequency response to the reference frequency response signal;
- and
- modifying the output of the loudspeaker based on the results of the comparing step.
5 more elements
A method of improving sound quality of a loudspeaker in a room, the method comprising:
- providing a reference frequency response signal indicating a desired frequency response for the loudspeaker;
- measuring a frequency response of an output of the loudspeaker in the room;
- matching the reference frequency response signal with the measured frequency response by aligning the reference frequency response signal with the measured frequency response in a low frequency range;
- comparing the measured frequency response in the room to the reference frequency response signal after the matching step;
- and
- modifying the output of the loudspeaker based on the results of the comparing step.
3 more elements
Dependencies are inferred from the claim text.