Self-calibrating loudspeaker system
First Claim
1. A loudspeaker comprising:
- at least one speaker;
at least one audio input to receive an audio signal;
at least one microphone input to connect to at least one microphone;
a loudspeaker control system, mounted in the loudspeaker, the loudspeaker control system having an audio signal processor to process the at least one audio signal, the audio signal processor being configurable to adjust sound characteristics of the speaker; and
the loudspeaker control system including a self-calibration function to perform with the at least one microphone in a selected listening area in a room, the self-calibration function operable to generate a test sound via the at least one speaker for pickup by the at least one microphone and to analyze a test signal received by the at least one microphone to determine at least one sound effect caused by the room at the listening area, and to configure the audio signal processor to compensate for the sound effects caused by the room by adjusting the sound characteristics of the speaker, where the self-calibration function includes a room mode correction function that analyzes the test signal by determining a frequency response, analyzes the frequency response at a low frequency range below a selected frequency to identify any room modes, and generates parameters for a digital filter to compensate for the room modes.
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Accused Products
Abstract
Systems and methods for calibrating a loudspeaker with a connection to a microphone located at a listening area in a room. The loudspeaker includes self-calibration functions to adjust speaker characteristics according to effects generated by operating the loudspeaker in the room. In one example, the microphone picks up a test signal generated by the loudspeaker and the loudspeaker uses the test signal to determine the loudspeaker frequency response. The frequency response is analyzed below a selected low frequency value for a room mode. The loudspeaker generates parameters for a digital filter to compensate for the room modes. In another example, the loudspeaker may be networked with other speakers to perform calibration functions on all of the loudspeakers in the network.
303 Citations
23 Claims
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1. A loudspeaker comprising:
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at least one speaker; at least one audio input to receive an audio signal; at least one microphone input to connect to at least one microphone; a loudspeaker control system, mounted in the loudspeaker, the loudspeaker control system having an audio signal processor to process the at least one audio signal, the audio signal processor being configurable to adjust sound characteristics of the speaker; and the loudspeaker control system including a self-calibration function to perform with the at least one microphone in a selected listening area in a room, the self-calibration function operable to generate a test sound via the at least one speaker for pickup by the at least one microphone and to analyze a test signal received by the at least one microphone to determine at least one sound effect caused by the room at the listening area, and to configure the audio signal processor to compensate for the sound effects caused by the room by adjusting the sound characteristics of the speaker, where the self-calibration function includes a room mode correction function that analyzes the test signal by determining a frequency response, analyzes the frequency response at a low frequency range below a selected frequency to identify any room modes, and generates parameters for a digital filter to compensate for the room modes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for calibrating a loudspeaker comprising:
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at least one microphone input to connect to at least one microphone; and a loudspeaker control system mounted in the loudspeaker, the loudspeaker control system having an audio signal processor configurable to adjust sound characteristics of the loudspeaker, and a self-calibration function to perform with the microphone in a selected listening area in a room, the self-calibration function operable to generate a test sound via the loudspeaker for pickup by the microphone and to analyze a test signal received by the microphone in response to the test sound to determine at least one sound effect caused by the room at the listening area, and to configure the audio signal processor to compensate for the sound effects caused by the room by adjusting the sound characteristics of the loudspeaker, where the self-calibration function includes a room mode correction function that analyzes the test signal by determining a frequency response, analyzes the frequency response at a low frequency range below a selected frequency to identify any room modes, and generates parameters for a digital filter to compensate for the room modes. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for calibrating a loudspeaker comprising:
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connecting a microphone to the loudspeaker; placing the microphone in a listening area in a room; generating a test sound with the loudspeaker and receiving a test signal at the microphone in response to the test sound; processing the test signal within the loudspeaker by; determining a frequency response representing a sound effect caused by the room at the listening area; analyzing the frequency response at a low frequency range below a selected frequency to identify any room modes; and generating parameters for a digital filter to compensate for the room modes; and configuring the loudspeaker with the digital filter to compensate for the sound effects caused by the room by adjusting the sound characteristics of the loudspeaker. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification