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US 11,307,285 B2Granted
Apparatus, system and method for spatially locating sound sources
AssigneeSeven Bel GmbH
InventorThomas Rittenschober
Life of this patent
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Abstract
An apparatus comprising at least one first microphone (10) which is movably arranged, at least one second stationary microphone (11) and at least one sensor (16) is described. The microphones can capture the sound waves emitted by acoustic sources, and the sensor can capture spatial coordinates of the first microphone. A corresponding method and a system having the apparatus mentioned are also described.
Claims23
A system, comprising:
- an apparatus comprising at least one first microphone movably arranged and designed to capture acoustic sources in a measurement scene;
- a second stationary microphone designed to capture acoustic sources in the measurement scene;
- and at least one position sensor designed to capture the position of the at least one first microphone;
- and
- a computation unit configured to determine an acoustic source strength at one or more reconstruction points based on sensor signals of the first microphone and of the second microphone, and also based on a captured position signal of the at least one position sensor.
2 more elements
A system, comprising:
- a holder;
- an apparatus comprising:
- at least one first microphone movably arranged and designed to capture acoustic sources in a measurement scene;
- a second stationary microphone designed to capture acoustic sources in the measurement scene;
- and at least one position sensor designed to capture the position of the at least one first microphone, the apparatus being mounted on the holder;
- and
- a device configured to be fastened on the holder and designed to receive measurement data based on sensor signals from the apparatus and to visualize measurement results based on the measurement data.
4 more elements
A method, comprising:
- moving a first microphone relative to a fixed reference position at which a second microphone is arranged;
- capturing sensor signals supplied by the first microphone and the second microphone and simultaneously capturing a position signal which indicates a position of the first microphone relative to the fixed reference position;
- and
- computing an acoustic source strength at one or more reconstruction points based on the sensor signals of the first microphone and of the second microphone, and also based on the captured position signal.
1 more element
A method, comprising:
- capturing at least one first sensor signal by at least one first microphone which moves along a defined trajectory, and simultaneously measuring a position of the at least one first microphone relative to a fixed reference position;
- capturing a second sensor signal by a second microphone located in the reference position;
- determining a contribution of virtual sound sources, which are located virtually at multiple settable reconstruction points, to a measured signal power of the second sensor signal based on the first sensor signal, the second sensor signal and the measured position of the second microphone relative to the fixed reference position.
A method for reconstruction of acoustic source strength at an arbitrary spatial point by estimation of coherence between a time signal of a first stationary acoustic sensor and a transform of a time signal of a second moving sensor,
- wherein the time signal of the second moving acoustic sensor is transformed by a time shift taking into consideration a propagation speed in a medium in question to the reconstruction point,
- wherein a resulting signal is used for exciting a monopole acoustic source at the reconstruction point, is time-shifted by a DC component with an inverted time delay profile with respect to a time-dependent time delay between the reconstruction point and a position of the second moving acoustic sensor, and is subsequently mapped to a site of the first stationary acoustic sensor by a constant time shift,
- wherein a coherence function determined in the frequency domain defines a measure of the contribution of a source emitting from the reconstruction point with respect to a level measured at the site of the first stationary acoustic sensor.
Dependencies are inferred from the claim text.