Method and system for generation of sound fields

A sound field and ultrasonic technology, applied in the field of sound field generation, can solve problems such as immaturity and difficulty in focusing ability

Active Publication Date: 2015-09-23
NOVETO SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology has not matured to commercial implementation due to difficulties in providing adequate focusing capabilities

Method used

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  • Method and system for generation of sound fields
  • Method and system for generation of sound fields
  • Method and system for generation of sound fields

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Embodiment Construction

[0051] Reference is made together to FIGS. 1A and 1B which schematically illustrate the known principle of demodulation of an ultrasound beam through a nonlinear medium. Sending high frequency sound / sound waves (ultrasound) with a high sound pressure level (SPL) causes air molecules to behave in a non-linear fashion - the higher the amplitude, the faster the molecules move. Thus, an input (ultrasonic) sine wave signal S with a sufficiently high SPL propagating through a nonlinear medium, as illustrated for example in FIG. 1A 0 Harmonics are generated in a predictive manner and typically obtain a sawtooth S m shape. at the corresponding frequency f 1 and frequency f 2 With two ultrasonic waves being sent, the nonlinear behavior of the air will demodulate the signal and produce the following output and harmonics:

[0052] (1) Natural frequency f 1 and f 2 ;

[0053] (2) Harmonic nXf 1 and mXf 2 (n and m are integers);

[0054] (3) sum of frequency f 1 +f 2 ;as well a...

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Abstract

A system and method are presented for generating a localized audible sound field at a designated spatial location. The method comprises: providing sound-data indicative of an audible sound to be produced and location-data indicative of a designated spatial location at which the audible sound is to be produced; and utilizing the sound-data and determining frequency content of at least two ultrasound beams to be transmitted by an acoustic transducer system including an arrangement of a plurality of ultrasound transducer elements for generating said audible sound. The at least two ultrasound beams include at least one primary audio modulated ultrasound beam, whose frequency contents includes at least two ultrasonic frequency components selected to produce the audible sound after undergoing non-linear interaction in a non linear medium, and one or more additional ultrasound beams each including one or more ultrasonic frequency components. The location-data is utilized for determining at least two focal points for the at least two ultrasound beams respectively such that focusing the at least two ultrasound beams on the at least two focal points enables generation of a localized sound field with the audible sound in the vicinity of the designated spatial location.

Description

technical field [0001] The present invention relates to techniques for generating sound fields. Specifically, the present invention provides methods and systems for generating local sound fields by utilizing technologies ranging from ultrasound to audible sound. Background technique [0002] Various techniques have been developed to localize sounds, especially audible sounds, to be heard at certain areas in space (i.e., bright areas) and suppressed at other areas (i.e., dark areas) such that the sound pressure level in those areas Below the hearing threshold or low enough that it is perceived as part of the surrounding noise. [0003] Existing solutions for generating directional sound can be roughly categorized into two main technology categories: [0004] - Techniques for manipulating audible sound waves (ie relatively long wavelength sound waves) using conventional sound wave theory. [0005] - Techniques for generating audible sound using so-called nonlinear airborne ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K15/02H04B11/00H04R1/40
CPCG10K15/02H04R2217/03H04R1/403G10K11/343H04S7/302
Inventor N·巴巴约夫T·沙尼
Owner NOVETO SYST
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