Sound collection apparatus and method
AssigneeOki Electric Industry Co., Ltd.
InventorKazuhiro KATAGIRI
Life of this patent
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Abstract
There is provided a sound collection apparatus, including a directionality formation unit configured to form a directionality in a direction of a target area for input signals from a plurality of microphone arrays, a target area sound extraction unit configured to correct a delay between a target area and each of the microphone arrays, and a power of a target area sound component for an output from the directionality formation unit, suppress a non-target area sound by using each output after correction, and extract a target area sound, an area sound enhancement filter formation unit, and an area sound emphasis unit.
Claims5
A sound collection apparatus, comprising:
- a directionality formation unit configured to form a directionality in a direction of a target area for input signals from a plurality of microphone arrays;
- a target area sound extraction unit configured to correct a delay between a target area and each of the microphone arrays, and a power of a target area sound component for an output from the directionality formation unit, suppress a non-target area sound by using each output after correction, and extract a target area sound;
- an area sound enhancement filter formation unit configured to determine the target area sound component from an output of the target area sound extraction unit, form an area sound enhancement filter that suppresses a component other than the target area sound component, additionally calculate a power ratio between outputs from the directionality formation units of the microphone arrays, and change a value of the area sound enhancement filter by determining the component other than the target area sound component based on the power ratio;
- and
- an area sound emphasis unit configured to suppress a component other than the target area sound, and emphasize the target area sound by applying the area sound enhancement filter formed by the area sound enhancement filter formation unit to a sound signal collected by the microphone array.
A sound collection method, comprising:
- forming, by a directionality formation unit, a directionality in a direction of a target area for input signals from a plurality of microphone arrays;
- correcting, by a target area sound extraction unit, a delay between a target area and each of the microphone arrays, and a power of a target area sound component for an output from the directionality formation unit, suppressing a non-target area sound by using each output after correction, and extracting a target area sound;
- determining, by an area sound enhancement filter formation unit, the target area sound component from an output of the target area sound extraction unit, forming an area sound enhancement filter that suppresses a component other than the target area sound component, additionally calculating a power ratio between outputs from the directionality formation units of the microphone arrays, and changing a value of the area sound enhancement filter by determining the component other than the target area sound component based on the power ratio;
- and
- suppressing, by an area sound emphasis unit, a component other than the target area sound, and emphasizing the target area sound by applying the area sound enhancement filter formed by the area sound enhancement filter formation unit to a sound signal collected by the microphone array.
Dependencies are inferred from the claim text.