Acoustic apparatus
AssigneeYamaha Corporation
InventorsSatoshi Ukai, Ryo Tanaka, Toshiaki Ishibashi
Life of this patent
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Abstract
An acoustic apparatus without increasing noise etc. even when plural directional microphones collect sounds from a place of the same distances is provided. Sound signals output from the microphone arrays are subjected to phase shift by phase shift circuits 211A to 211H, and the sound signals are combined by an adder 212. The phase shift circuits 211A to 211H performs phase shifts according to installation positions of the microphone arrays. The phase shift circuit 211A makes the shift 0 degree, the phase shift circuit 211B makes the shift 45 degrees, the phase shift circuit 211C makes the shift 90 degrees, and sequentially to the phase shift circuit 211H, the shifts are made according to rotational angles.
Claims4
An acoustic apparatus comprising:
- a plurality of microphone arrays arranged on a circumference around one axis and facing outwardly away the one axis along a plane that is orthogonal to the one axis;
- and
- a sound signal processing circuit that delays a phase of a sound signal output from each of the microphone arrays by an angle on the circumference at an installation position of each of the microphone arrays,
- wherein the sound signal processing circuit includes an adder that combines the sound signals delayed by the sound signal processing circuit,
- wherein an angle of one microphone array, among the microphone arrays, is set to 0 degrees as a reference angle, the one microphone array being arranged at a reference installation position,
- wherein the other microphone arrays, among the microphone arrays, are arranged at installation positions along the circumference so that the angles of the installation positions of the other microphone arrays from the reference position are increased along a circumferential direction around the one axis, respectively, and
- wherein the sound signal processing circuit delays the phase of the sound signal output from each of the other microphone arrays in accordance with the angle of each of the installation positions of the other microphone arrays from the reference installation position.
Dependencies are inferred from the claim text.