Parametric array loudspeaker, signal processing method thereof

A loudspeaker and parametric array technology, applied in the direction of sensors, transducer circuits, sensor components, etc., can solve the problem that the ultrasonic carrier modulation signal cannot generate stable and sufficient signals

Inactive Publication Date: 2009-06-10
AAC ACOUSTIC TECH (SHENZHEN) CO LTD +1
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the ultrasonic carrier modulation signal output by the parametric a

Method used

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  • Parametric array loudspeaker, signal processing method thereof
  • Parametric array loudspeaker, signal processing method thereof
  • Parametric array loudspeaker, signal processing method thereof

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Embodiment Construction

[0019] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0020] A loudspeaker signal processing method of the present invention firstly performs preprocessing on useful audio signals, and the functions of the preprocessing mainly include increasing signal strength, reducing distortion, and enhancing low frequency. Assuming an audio signal g(t), the envelope signal E(t)=1+mg(t), where m is the modulation coefficient. The modulated finite-amplitude high-intensity ultrasonic carrier p 1 =p 0 E(t)sinω 0 (t), ω 0 is the ultrasonic circular frequency. Due to the nonlinear effect of ultrasonic carrier propagation in the air, the demodulated signal can be obtained P 2 ( t ) ∝ ∂ 2 ∂ t 2 E

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Abstract

The invention relates to the field of strong directivity parametric array loudspeaker. In the loudspeaker, audio signal and ultrasonic carrier signal are modulated, and by utilizing the strong directivity of the ultrasonic carrier, the audio signal beam with strong directivity is obtained. In particular, the invention relates to a parametric array loudspeaker and a method for treating signal thereof; the method uses conversion transducer units with different frequencies to form a transmitting array to transmit the ultrasonic carrier modulation signal after power amplification, thereby improving ultrasonic radiant intensity, outputting stable enough signal, making audio signal select a proper carrier frequency, further expanding frequency response of audio frequency and improving loudspeaker performance; and the method can be widely applied to the filed of controlling noise jamming.

Description

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Claims

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Application Information

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Owner AAC ACOUSTIC TECH (SHENZHEN) CO LTD
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