Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF0 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 array loudspeaker cannot generate a stable and sufficient signal, and propose a parametric array loudspeaker and its signal processing method

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Parametric array loudspeaker, signal processing method thereof
  • Parametric array loudspeaker, signal processing method thereof
  • Parametric array loudspeaker, signal processing method thereof

Examples

Experimental program
Comparison scheme
Effect test

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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

【Technical field】 [0001] The invention relates to a parametric array loudspeaker with strong directivity, which modulates an audio signal and an ultrasonic carrier signal, and uses the strong directivity of the ultrasonic carrier to obtain a strong directivity audio signal beam, specifically a parametric array loudspeaker and its signal processing method . 【Background technique】 [0002] Since the concept of parametric array was proposed in the 1960s, the parametric array theory has been gradually applied to the loudspeaker field, and related products have appeared. The principle of the parametric array speaker is different from the speaker in the general sense. Its principle is to use the nonlinear effect of the ultrasonic carrier wave to generate audio signals when it propagates in the air medium. When two columns of ultrasonic waves with different frequencies propagate in the same direction, the difference frequency signal is generated It can be detected by the human ear...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H04R1/20H04R3/00
Inventor 周荣冠
Owner AAC ACOUSTIC TECH (SHENZHEN) CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com