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High-efficiency complete-modulation pneumatic loudspeaker

An airflow loudspeaker and full modulation technology, applied in the field of acoustics, can solve the problems of large airflow waste and difficulty in improving efficiency, and achieve the effects of eliminating background noise, improving comprehensive air-acoustic conversion efficiency, and reducing airflow waste

Inactive Publication Date: 2008-10-08
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] 2) The waste of air flow is large, regardless of the volume of the sound played, the air flow consumption is always a constant maximum value;
[0020] 3) The maximum air-to-acoustic conversion efficiency of the current airflow speakers can only reach about 20%, which can produce 10,000-watt-level sound, and it is difficult to improve the efficiency

Method used

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  • High-efficiency complete-modulation pneumatic loudspeaker
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  • High-efficiency complete-modulation pneumatic loudspeaker

Examples

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Embodiment 1

[0055] The high-efficiency fully modulated airflow speaker provided by the present invention includes an air source, a sounding throat, a horn 6, a sound signal source 1 and a power amplifier 2, wherein the air flow is generated by the air source, modulated by a modulation valve in the sounding throat, and then enters the horn 6 Outward radiation; it is characterized in that, the output terminal of described sound signal source 1 is connected with one and lower envelope processing device 7, and then is connected with the electric component of described power amplifier 2 and described modulation valve in turn; Said sound signal When the source 1 outputs a zero signal, the ventilation volume of the modulating valve is zero.

[0056] Such as figure 2 As shown, in this embodiment, the modulating valve is an electromagnetically driven modulating valve, including a moving ring 4 , a fixed ring 5 and a vibrating coil 3 ; the output end of the power amplifier 2 is connected to the vi...

Embodiment 2

[0065] The modulating valve in this embodiment adopts a piezoelectric ceramic membrane modulating valve, and the rest of the components are the same as those in Embodiment 1. The difference between this embodiment and the dynamic-fixed ring 5 modulation method in Embodiment 1 is that the air flow vortex 10 is generated when the air flow enters the pipe through the bottom opening of the pipe, and the vortex is amplified in the pipe, so the gas-acoustic conversion efficiency ratio Example 1 is high. However, its vocal frequency range is narrow, and it is generally only suitable for narrow-band or single-frequency sounds.

[0066] Such as image 3 As shown, in this embodiment, the airflow enters through the airflow inlet 8, and the diaphragm 9 made of piezoelectric ceramics is used to modulate the air flow, and the sound signal controls the vibration of the piezoelectric ceramic diaphragm 9. Under negative half bias, the diaphragm 9 is directed to The deflection of the horn 6 m...

Embodiment 3

[0068] The modulating valve in this embodiment is a modulating valve driven by a piezoelectric ceramic stack or a modulating valve driven by a magnetostrictive element, and the rest of the components are the same as those in Embodiment 1.

[0069] In addition, it is worth noting that this embodiment requires that when the sound signal source 1 outputs a zero signal, the ventilation volume of the modulating valve is zero, but in actual operation, it is difficult to completely seal the modulating valve, so the 0.1L 0 The following ventilation volumes are considered as zero ventilation volume. The method of the present invention is applicable to digital airflow speakers as well as traditional airflow speakers.

[0070] In order to better understand the present invention, the sound generation principle of the present invention will be further described below in combination with simulation results.

[0071] The invention applies the bionic airflow sound generation mechanism. The ...

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Abstract

The present invention relates to a high efficiency complete modulation pneumatic loudspeaker comprising air source, phonation larynx, loudspeaker, sound signal source and power amplifier; the airflow is generated by the air source and enters into the loudspeaker to radiate sound outwards after modulating by the modulating valve in the phonation larynx; the present invention is characterized in that, the output end of the sound signal source is connected with a removing enveloped processing apparatus, and then orderly connected with the power amplifier and the electrical part of the modulating valve; when the sound signal source outputs zero signal, the ventilation of the modulating valve is zero. The present invention has the following technical effects of greatly reducing the airflow waste, improving the rate of multipurpose utilization of airflow energy and improving comprehensive air-sound converting ratio; the present invention is specially suitable for sound playing and is able to obtain greater sound power output.

Description

technical field [0001] The invention belongs to the field of acoustics, in particular, the invention relates to an airflow loudspeaker. Background technique [0002] Ordinary modulated airflow speakers adjust the airflow on the basis of half ventilation to achieve the purpose of producing sound. The "high-power broadband airflow speaker" (ZL97249127.9) patented by the Institute of Acoustics, Chinese Academy of Sciences is a semi-ventilated modulated airflow speaker, which can produce a wide-band sound of 20,000 sound watts. It is currently the most suitable airflow speaker for voice playback. Its modulation valve has multiple rows of modulation air channels, which can play high-power sound. Patents ZL200420026347.5, US5179595, WO90 / 03708, US6065688, US5054080, US6065688, EP0362068 (Notice No.), EP0012070 (Notice No.) also adopt the half-ventilation modulation method, that is, there is half airflow output when there is no sound. This airflow modulation method not only has a...

Claims

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Application Information

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IPC IPC(8): H04R1/42H04R9/04
Inventor 杨亦春
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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