Direction of arrival estimation device, system, and direction of arrival estimation method
AssigneePanasonic Intellectual Property Corporation of America
InventorsRohith Mars, Srikanth Nagisetty, Chong Soon Lim, Hiroyuki Ehara, Akihisa Kawamura
Life of this patent
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Abstract
Provided is a direction of arrival estimation device wherein: a calculation circuit calculates a frequency weighting factor for each of a plurality of frequency components of signals recorded in a microphone array, on the basis of the differences among unit vectors indicating the directions of the sound sources of each of the plurality of frequency components; and an estimation circuit estimates the direction of arrival of a signal from the sound source, on the basis of the frequency weighting factors.
Claims9
A direction-of-arrival estimation apparatus, comprising:
- direction of arrival (DoA) unit vector estimation circuitry that estimates a DoA unit vector that indicates a direction of a sound source for each of a plurality of frequency bins of a signal arriving from the sound source using the signal recorded by a microphone array;
- calculation circuitry that selects, from among the estimated DoA unit vectors, as a representative DoA unit vector, a DoA unit vector in one frequency bin in which a sum of differences between the DoA unit vector and DoA unit vectors of other frequency bins is a minimum, and calculates a frequency weighting factor for each of the plurality of frequency bins based on the selected representative DoA unit vector;
- and
- estimation circuitry that selects, from among the estimated DoA unit vectors, DoA unit vectors based on the calculated frequency weighting factor, and estimates the direction of arrival of the signal using the selected DoA unit vectors.
A system, comprising:
- a direction-of-arrival estimation apparatus that estimates a direction of arrival of a signal arriving from a sound source;
- a beamformer that extracts an acoustic signal by beamforming toward the direction of arrival;
- an encoder that encodes the acoustic signal;
- and
- a decoder that decodes the encoded acoustic signal;
- wherein the direction-of-arrival estimation apparatus:
- estimates a direction of arrival (DoA) unit vector that indicates a direction of the sound source for each of a plurality of frequency bins of the signal arriving from the sound source using the signal recorded by a microphone array;
- selects, from among the estimated DoA unit vectors, as a representative DoA unit vector a DoA unit vector in one frequency bin in which a sum of differences between the DoA unit vector and DoA unit vectors of other frequency bins is a minimum, and calculates a frequency weighting factor for each of the plurality of frequency bins based on the selected representative DoA unit vector;
- unit and
- selects, from among the estimated DoA unit vectors, DoA unit vectors based on the calculated frequency weighting factors and estimates the direction of arrival of the signal using the selected DoA unit vectors.
A direction-of-arrival estimation method, comprising:
- estimating, by a direction-of-arrival estimation apparatus, a direction of arrival (DoA) unit vector that indicates a direction of a sound source for each of a plurality of frequency bins of a signal arriving from the sound source using the signal recorded by a microphone array;
- selecting, by the direction-of-arrival estimation apparatus, from among the estimated DoA unit vectors, as a representative DoA unit vector a DoA unit vector in one frequency bin in which a sum of differences between the DoA unit vector and DoA unit vectors of other frequency bins is a minimum;
- calculating, by the direction-of-arrival estimation apparatus, a frequency weighting factor for each of the plurality of frequency bins based on the selected representative DoA unit vector;
- and
- selecting, by the direction-of-arrival estimation apparatus, from among the estimated DoA unit vectors, DoA unit vectors based on the calculated frequency weighting factors and estimating, by the direction-of-arrival estimation apparatus, the direction of arrival of the signal using the selected DoA unit vectors.
Dependencies are inferred from the claim text.