Sound pickup apparatus and echo cancellation processing method
First Claim
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1. A sound pickup apparatus comprising:
- a plurality of microphones arranged based on a predetermined arrangement condition;
a microphone selection section for selecting one or more of a plurality of the microphones;
an echo cancellation processing section for performing echo cancellation processing for each microphone for a sound signal detected by the selected microphone;
an echo cancellation calibration sound generation section;
a speaker outputting a calibration sound from the echo cancellation calibration sound generation section, and an echo cancellation processing control section for driving the echo cancellation calibration sound generation section to generate an echo cancellation calibration sound and to output it from the speaker and selecting one or more microphones detecting sounds including the echo cancellation calibration sound outputted from the speaker via the microphone selection section in a learning mode of the echo cancellation processing section, and generating or updating an echo cancellation use parameter by learning for the selected microphone in the echo cancellation processing section.
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Abstract
The present invention is related to a sound pickup apparatus selecting one of a plurality of microphones and performing echo cancellation processing for a plurality of microphones with an echo canceller to output a sound. The sound pickup apparatus sets a “learning mode” when the power supply is turned on, outputs a calibration sound from an echo cancellation calibration sound generator via a speaker, detects an echo at that time with a microphone and obtains an echo cancellation use parameter canceling the echo.
51 Citations
10 Claims
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1. A sound pickup apparatus comprising:
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a plurality of microphones arranged based on a predetermined arrangement condition;
a microphone selection section for selecting one or more of a plurality of the microphones;
an echo cancellation processing section for performing echo cancellation processing for each microphone for a sound signal detected by the selected microphone;
an echo cancellation calibration sound generation section;
a speaker outputting a calibration sound from the echo cancellation calibration sound generation section, and an echo cancellation processing control section for driving the echo cancellation calibration sound generation section to generate an echo cancellation calibration sound and to output it from the speaker and selecting one or more microphones detecting sounds including the echo cancellation calibration sound outputted from the speaker via the microphone selection section in a learning mode of the echo cancellation processing section, and generating or updating an echo cancellation use parameter by learning for the selected microphone in the echo cancellation processing section. - View Dependent Claims (2, 3, 4, 5)
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6. An echo cancellation processing method comprising the steps of:
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generating an echo cancellation calibration sound via a speaker and detecting sounds including the calibration sound with a microphone in a learning mode of echo cancellation processing;
performing echo cancellation processing for the detected sound signal of the microphone to generate or update an echo cancellation use parameter for the microphone, and performing the echo cancellation processing by using the obtained echo cancellation use parameter after the learning mode. - View Dependent Claims (7, 8, 9, 10)
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Specification