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Method for generating parametric sound and means for carying out method

A parametric, sound technology that can be used in fluids that use vibration, sound-producing devices, electrostatic sensors, etc., and can solve the problem of high cost of transducers

Active Publication Date: 2021-03-09
UAB NEUROTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of this method is the high cost of the transducer, especially when manufacturing a small number of transducers
In addition, this method is not suitable for manufacturing electrostatic transducers with high electromechanical efficiency

Method used

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  • Method for generating parametric sound and means for carying out method
  • Method for generating parametric sound and means for carying out method
  • Method for generating parametric sound and means for carying out method

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Embodiment Construction

[0029] figure 1 and figure 2An embodiment of a parametric audio system according to the invention is shown. An embodiment of the system according to the invention comprises an audio signal input device (1), an audio signal processor (2), an ultrasonic signal generator (3), a modulator (4), a class D amplifier (6), a high frequency coil (7) and an ultrasonic electrostatic transducer (8). According to another embodiment, the system according to the previous embodiment also comprises a high pass filter (5) ensuring that only ultrasound frequencies are passed to the amplifier (6) and thus transmitted by the transducer (8). In both of the above-mentioned embodiments there may be no high-frequency coil (7).

[0030] image 3 Another embodiment of the present invention implementing a phased array parametric sound system is shown. The system includes an audio signal input device (1), an audio signal processor (2), an ultrasonic signal generator (3), a modulator (4), an optional...

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Abstract

The present invention discloses a method for producing parametric sound using parametric sound system which is based on ultrasonic electrostatic transducers. It comprises modulation of a carrier ultrasonic signal with a processed audio signal in audio signal processor comprising adaptive frequency filtering based on the audio signal level, dynamic range compression, square root operation, amplification of the modulated ultrasonic signal using a D-class amplifier, driving an electrostatic transducer and generating modulated ultrasonic waves into the air. The electrostatic transducer for the parametric sound system comprises a specific back plate structure that improves electromechanical efficiency of the transducer and also enables realization of a phased array on a single back plate. The disclosed manufacturing method of the electrostatic transducer comprises producing sets of electrodes on the surface of the back plate forming individual cells.

Description

technical field [0001] The present invention relates to the field of parametric sound generation, and in particular to a method for generating parametric sound, a parametric sound system for generating such parametric sound, an ultrasonic electrostatic transducer for such a system for generating ultrasonic waves And methods of making such ultrasonic electrostatic transducers. Background technique [0002] Ultrasonic waves modulated with an audio signal travel through the air while being demodulated to produce parametric sounds. Since ultrasonic waves have low diffraction compared to audio waves, the parametric system allows sound to be transmitted in narrow beams. This enables the creation of localized areas where sound can be heard but is attenuated elsewhere. Applications of parametric sound range from personalizing audio systems and targeted advertising to alleviating tinnitus symptoms. [0003] The non-linear nature of the demodulation process requires preprocessing o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B06B1/02G10K15/02
CPCG10K15/02B06B1/0292B06B2201/51B06B2201/76H04R19/013H04R2217/03
Inventor 奥斯瓦尔达斯·普特奇斯盖利乌斯·万加斯马里乌斯·米科拉朱纳斯达吕斯·维索尼斯
Owner UAB NEUROTECH