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US 8,238,547 B2Granted
Sound pickup apparatus and echo cancellation processing method
AssigneeSony Corporation
InventorsKazuhiro Ohki, Hiroyuki Suzuki
Life of this patent
Estimating the term…
Abstract
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.
Claims10
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, excluding an echo, and to output the echo calibration sound from the speaker and selecting one or more of the plurality of 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, thereby obtaining the echo cancellation use parameter for preforming echo cancellation,
- wherein a flag indicating a state of the echo cancellation use parameter for each microphone of said plurality of microphones is read, and when the flag indicates that the echo cancellation use parameter for each of said plurality of microphones is obtained, the learning mode of the echo cancellation processing section is bypassed, and
- wherein the echo cancellation calibration sound is an audible sound having a predetermined frequency band and various types of amplitudes of a sound level.
5 more elements
An echo cancellation processing method comprising the steps of:
- generating an echo cancellation calibration sound, excluding an echo, via a speaker and detecting sounds including the calibration sound with a respective one of plural microphones in a learning mode of echo cancellation processing,
- wherein a flag indicating a state of an echo cancellation parameter use parameter for each of said plural microphones is read, and when the flag indicates that the echo cancellation use parameter for each of said plural microphones is obtained, the learning, mode of echo cancellation processing is bypassed, and
- wherein the echo cancellation calibration sound is an audible sound having a predetermined frequency band and various types of amplitudes of a sound level;
- performing echo cancellation processing for the detected sound signal of the respective microphone to generate or update an echo cancellation use parameter for the microphone, and
- performing the echo cancellation processing by using the generated or updated echo cancellation use parameter after the learning mode.
2 more elements
Dependencies are inferred from the claim text.