Active nondirectional loudspeaker system with equalization

A non-directional, loudspeaker technology, applied in signal processing, frequency response correction, electrical components, etc., can solve the problems of low frequency range attenuation, uneven frequency response, etc., to achieve the effect of small amplitude change and flat amplitude frequency response

Active Publication Date: 2017-04-26
FUJIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to design a loudspeaker system to solve the problems of uneven frequency response and serious attenuation of low frequency range in the above-mentioned technology

Method used

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  • Active nondirectional loudspeaker system with equalization

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Embodiment Construction

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0028] Such as figure 1 As shown, a kind of active non-directional loudspeaker system with equalization, comprises audio signal interface 1, and audio signal interface 1 is connected with digital filter 2, and described digital filter 2 comprises adopting spatial multi-point transfer function to carry out geometric average An inverse equalizer 201 set by an inverse transfer function and a band-pass filter 202 with upper and lower frequencies of 8879.7 Hz and 44.5 Hz respectively, the digital filter 2 is connected to a power amplifier 3, and the power amplifier 3 is connected to a speaker 4, and the speaker 4 It includes a reverse horn speaker 401 and a low frequency speaker 402 .

[0029] Compared with the non-directional sound source of the 12-sided loudspeaker system, the volume of the loudspeaker system c...

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Abstract

The invention discloses an active nondirectional loudspeaker system with equalization. The system comprises an audio signal interface. The audio signal interface is connected to a digital filter. The digital filter comprises an inverse equalizer and a band pass filter. The digital filter is connected to a power amplifier. The power amplifier is connected to a loudspeaker. The loudspeaker comprises an inverse horn shape sound box and a low frequency sound box. In the invention, the size is small and the system only works in a test frequency scope required by a correlation standard; through testing a spatial multi-point transmission function of a loudspeaker, according to the multi-point transmission function, one digital signal filtering system is designed; an amplitude frequency response of the digital signal filtering system is at a peak valley and is inverse with an average amplitude frequency response of spatial multiple points of the nondirectional loudspeaker system so that purposes that the amplitude frequency response of the loudspeaker system is straight and an adjacent frequency range amplitude change is small are reached; and the system can be used for architectural acoustics and electroacoustic testing.

Description

technical field [0001] The invention relates to the field of special sound sources for acoustic measurement, in particular to an active non-directional loudspeaker system with equalization. Background technique [0002] In architectural acoustics and noise testing, the non-directional sound source speaker system is used as the test sound source, and its ability to radiate sound to all directions in the space is required to be consistent (non-directional), and it must be relatively flat in the frequency range of interest in the test. frequency response. And with the deepening of low-frequency noise research, more and more experimenters and researchers hope that the omnidirectional sound source speaker system has better low-frequency reproduction capability (as low as 44.5Hz) to meet the requirements of low-frequency signal-to-noise ratio . [0003] In the process of using the omnidirectional sound source speaker system, it is found that the existing omnidirectional sound so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/04
CPCH04R3/04H04R2430/00
Inventor 蔡阳生林从华何惠妍
Owner FUJIAN UNIV OF TECH
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