Unlock instant, AI-driven research and patent intelligence for your innovation.

Micro audio directional loudspeaker with three dimension soundeffect

An audio frequency orientation and loudspeaker technology, which is applied in the loudspeaker and electronic fields, can solve the problems of lack of three-dimensionality and unclear levels of audible sound, and achieve the effect of low power consumption and small volume

Inactive Publication Date: 2009-11-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
View PDF0 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The audible sound produced by this technology has strong directivity and has a good application prospect. However, the audible sound produced by self-demodulation is unclear and lacks three-dimensionality, so it cannot bring the ideal sense to the listener. Enjoyment, so its scope of application has certain limitations

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
  • Micro audio directional loudspeaker with three dimension soundeffect
  • Micro audio directional loudspeaker with three dimension soundeffect
  • Micro audio directional loudspeaker with three dimension soundeffect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] figure 1 Shows the functionality of an audio directional speaker with three-dimensional sound effects. The audio frequency directional speaker 1 with three-dimensional sound effects sends out the pre-processed ultrasonic waves 3 to the left and right ears of the user 2 respectively. With the self-demodulation of the ultrasonic waves in the air, what finally reaches the ears of the user 2 is a three-dimensional virtual The audible sound of the sound effect not only realizes the directional transmission of sound, but also solves the problem of thin sound quality and no stereoscopic effect of general audio directional speakers.

[0021] figure 2 It is the overall structure diagram of the miniature audio frequency directional loudspeaker with three-dimensional sound effect. The miniature audio frequency directional speaker with three-dimensional sound effect is composed of a low-pass filter 4, an A / D converter 5, a signal processing unit 6, a D / A converter 9, a band-pass...

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 a micro audio directional loudspeaker with three dimension soundeffect, belonging to the technical field of electronic, in particular to the technical field of loudspeaker. The micro audio directional loudspeaker with three dimension soundeffect comprises a digital signal processing part, a power amplification part and a micro ultrasonic transducer part; wherein, in the signal processing unit, the input audio signal is firstly convolved with head related transfer function (HRTF), loaded into ultrasound through amplitude modulation, and amplified by the power amplifier; the processed ultrasound is output by MEMS transducer. Due to air nonlinear interaction, the output ultrasound signal generates audible sound with high directivity and lifelike and virtual three dimension soundeffect by self-modulating. The loudspeakers can be widely used in various portable multimedia mobile equipments, which can bring listeners an immersed sense and has no interference to peripheral environment due to directivity thereof.

Description

technical field [0001] The utility model relates to a miniature audio frequency directional loudspeaker with three-dimensional sound effect, which belongs to the field of electronic technology, and particularly relates to the field of loudspeakers. Background technique [0002] The existing audio frequency directional loudspeaker is a sound emitting device that radiates pretreated ultrasonic waves directly into the air. Its main principle is to use the high directivity characteristics of ultrasonic waves to modulate audible sound signals into ultrasonic waves with a fixed frequency. Above, after being amplified, it is emitted into the air by the ultrasonic transducer. According to Berktay's far-field solution theory, the modulated ultrasonic signal demodulates a highly directional audible sound due to the nonlinear self-demodulation effect of the air, and the amplitude of the demodulated audible sound is equal to the square of the envelope of the modulated signal. proportio...

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
Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/00H04R5/04H04R1/20
Inventor 徐利梅李学生王祎王佑翔
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA