Microphone apparatus
AssigneeSony Corporation
InventorsNobuyuki Kihara, Yoshikazu Takahashi, Yasuhiko Kato
Life of this patent
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Abstract
A microphone apparatus for processing and outputting an output signal of a microphone array including at least nine microphones includes a directivity function processing circuit that converts the output signal of the microphone array into a unidirectional signal and that outputs the unidirectional signal. The directivity function processing circuit expands a directivity function whose variable is an incident angle of an acoustic wave into a Fourier series up to at least third order. The variable in the expanded expression is produced from output signals of the microphones forming the microphone array.
Claims6
A microphone apparatus for processing and outputting an output signal of a microphone array including at least nine microphones, the microphone apparatus comprising:
- a directivity function processing circuit that converts the output signal of the microphone array into a unidirectional signal and that outputs the unidirectional signal,
- wherein the directivity function processing circuit expands a directivity function whose variable is an incident angle of an acoustic wave into a Fourier series up to at least third order, and
- the variable in the expanded expression is produced from output signals of the microphones forming the microphone array.
A speech signal converting method for processing and outputting an output signal of a microphone array including at least nine microphones, the speech signal converting method comprising the steps of:
- converting the output signal of the microphone array into a unidirectional signal;
- expanding a directional function whose variable is an incident angle of an acoustic wave into a Fourier series up to at least third order;
- and
- producing the variable in the expanded expression from output signals of the microphones forming the microphone array.
Dependencies are inferred from the claim text.