Driving of parametric loudspeakers

一种参量扬声器、驱动信号的技术，应用在扩音器、传感器、传感器类型等方向，能够解决高水平失真、预处理性能差、低音频质量等问题，达到降低转换率、高效实现、改善音频质量的效果

Inactive Publication Date: 2013-03-27
KONINK PHILIPS ELECTRONICS NV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, this simplification leads to poor preprocessing performance, resulting in high levels of distortion and low audio quality

Method used

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  • Driving of parametric loudspeakers
  • Driving of parametric loudspeakers
  • Driving of parametric loudspeakers

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Embodiment Construction

[0084] The following description focusing on the embodiments of the present invention is applicable to a parametric speaker device using ultrasonic carrier single sideband (SSB) amplitude modulation (AM). However, it will be understood that the principles and methods described are equally applicable to suppressed sideband AM modulation.

[0085] image 3 Examples of parametric speaker systems according to certain embodiments are shown. The system includes an ultrasonic transducer 301 that radiates a modulated ultrasonic signal. The ultrasonic signal is modulated by the audio signal so that the subsequent air demodulation of the ultrasonic signal results in audio reproduction.

[0086] The parametric speaker system includes an input circuit 303 that receives the signal x(t) to be reproduced as sound from any suitable internal or external source. Over-the-air demodulation of the ultrasound signal results in an audio signal that is a distortion of the ultrasound signal envelope. In...

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Abstract

A parametric loudspeaker system comprises a pre-compensator (305) for generating a pre-compensated envelope signal by applying a pre-compensation to the input audio signal where the pre-compensation compensates for distortion of in-air demodulation of the modulated ultrasound signal. A pre-modulator (307) generates a complex base band signal generating a phase signal from the pre-compensated envelope signal using a predetermined function for determining a phase signal from an amplitude signal such that the corresponding complex signal has either suppressed negative or positive frequencies. The complex base band signal is then generated to have an amplitude corresponding to the pre-compensated envelope signal and a phase corresponding to the phase signal. A modulator (309) quadrature modulates the complex base band signal on an ultrasonic quadrature carrier and an output circuit (311) drives the ultrasound transducer (301) from the modulated signal. The invention may allow effective yet low resource pre-compensation for a suppressed or single sideband modulated modulated ultrasound signal.

Description

Technical field [0001] The invention relates to the driving of a parametric loudspeaker. More specifically but not exclusively, the present invention relates to pre-compensation of parametric loudspeaker sideband modulation. Background technique [0002] In recent years, more and more attention has been paid to sound provision that focuses on spatial perception. Specifically, this kind of sound supply is ideal for producing high directivity narrow audio beams in many applications. For example, in a virtual surround sound system that generates a virtual back or side sound source from a physical sound transducer placed in front of the user, the highly directional audio beam is reflected by the wall to the side or back of the user, so that it can be at these reflection points Perceive virtual sound sources. [0003] However, such narrow beams with high directivity are difficult to produce by traditional audio band speakers. Therefore, some people propose alternative methods based ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/04
CPCH04R3/04H04R2217/03H04R2400/00
Inventor W.J.拉姆R.M.亚尔特斯
Owner KONINK PHILIPS ELECTRONICS NV
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