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Sensors and method for generating spatially coded sound fields through sound-emitting apertures having spatially varying frequency and bandwidth

A technology of sound field and space structure, applied in the field of acoustic transducers, can solve problems such as attenuation of multiple reflections, unsuitable for airborne sound or low frequency range, etc., to achieve optimized design, power consumption and payload or size reduction, size and Frequency range easy effects

Active Publication Date: 2022-01-04
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, they are not suitable for airborne sound or the low frequency range, and attenuation and multiple reflections can cause problems

Method used

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  • Sensors and method for generating spatially coded sound fields through sound-emitting apertures having spatially varying frequency and bandwidth
  • Sensors and method for generating spatially coded sound fields through sound-emitting apertures having spatially varying frequency and bandwidth
  • Sensors and method for generating spatially coded sound fields through sound-emitting apertures having spatially varying frequency and bandwidth

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Embodiment Construction

[0040] In the following, some exemplary embodiments are described, in which by forming a field from parts of a specific frequency spectrum in a plane perpendicular to the direction of propagation, i.e. in a lateral extension, the field then forms by superposition the frequency-encoded sound field of the total aperture, Frequency encoding of the sound field is achieved in different ways. By combining different frequencies or spectra with spatial information, a spatially structured, frequency-coded sound field is obtained, wherein this spatial information is introduced into the superimposed overall sound field via the place of origin of the respective frequencies.

[0041] In this case, the total aperture is only controlled by a single transmit / receive channel, ie also by only one input signal (for example in the form of AC voltage). The different frequency spectra thus forming the superimposed total signal are preferably produced by locally different properties of the acoustic ...

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Abstract

The invention relates to a transducer for generating and / or receiving a spatially structured sound field. The transducer comprises an overall aperture (10) that generates and / or receives the sound field, wherein the overall aperture comprises a plurality of sub-apertures (12, 14, 16, 18), each of the sub-apertures is configured to receive and / or generate ultrasound having a specific frequency spectrum, the specific frequency spectra of at least two of the sub-apertures differ, and all of the sub-apertures of the overall aperture are connected to the same electronic actuation channel.

Description

technical field [0001] The present invention relates to an acoustic transducer for a spatial frequency encoded sound field, a method of detecting ultrasonic waves using such an acoustic transducer and a method of manufacturing an acoustic transducer for a spatial frequency encoded sound field. Background technique [0002] Ultrasound is today of fundamental importance in many technical fields, including as an imaging method, as a sensor in various applications (for example, to measure flow velocity or distance) or for the directed introduction of energy into materials or tissues via ultrasonic energy. [0003] To generate and detect sound, especially ultrasound, transducers are used, which usually output an acoustic signal in the form of sound pressure based on an electrical signal (voltage or current) or, conversely, generate an electrical signal based on an acoustic signal received via the transducer. For example, piezoelectric elements can be used for this purpose. Depen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B06B1/02B06B1/06H10N30/30
CPCB06B1/0292B06B1/0644H10N30/302
Inventor 史蒂芬·特雷巴马克·福内尔丹尼尔·施密特
Owner FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV