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Loudspeaker

A loudspeaker and sound technology, applied in the field of loudspeakers, can solve the problems of large volume of loudspeakers and not too shallow of loudspeakers, and achieve the effect of tolerance to temperature changes

Inactive Publication Date: 2006-04-05
NEW TRANSDUCERS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This means that the enclosure cannot be too shallow and a large volume is required after the loudspeaker

Method used

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Examples

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Embodiment Construction

[0040] In Fig. 1 a diffuse mode panel 11 is produced using the teaching of WO97 / 09842. The panel has a preferred scatter pattern aspect ratio of 1:882 or 1:0.707. A transducer 13 is installed at a preferred transducer location behind the panel. A shallow speaker 15 defines a shallow cavity 17 together with the panel 11 . A conduit 19 is provided at the end of the cavity. The conduit is a quarter wavelength of the coupled bulk mode of the panel 11 on springs formed by the air in the cavity 17 and any elastomer in the panel 11 support. A sound-absorbing material 21 is provided in the conduit 19 .

[0041] refer to figure 2 , which is a second embodiment illustrated at the rear of cavity 17 of 260mm by 210mm. The panel 11 forms the upper surface of the cavity and the transducer is shown at 13 . The four conduits 19 provided are respectively on the four sides of the cavity. Each duct is 120mm long; therefore, all four ducts are tuned to the same resonance, here the overall ...

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PUM

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Abstract

A loudspeaker has a bending wave panel (11) and an exciter (13) mounted on the panel to excite bendingg wave modes in the panel. A rear box (15) defines a cavity (17) in cooperation with the panel (11). A resonance of cavity and panel at a coupled mode resonance frequency may be controlled by providing a duct (19) coupled to the cavity to selectively reduce sound pressure at the coupled mode resonance frequency. Damping (21) may be provided in the duct (19).

Description

technical field [0001] The present invention relates to loudspeakers and more particularly to loudspeakers incorporating resonant panel acoustic emitters. Background technique [0002] In some applications, it is preferable to mount the loudspeaker within a shallow enclosure. [0003] Especially for diffuse mode loudspeakers mounted on the wall. If the loudspeaker has an open back, the adjacent walls will uncontrollably affect the sound output because the environment is not constant from one loudspeaker position to another. The provision of a shallow shroud can alleviate this problem. [0004] However, shallow hoods have some disadvantages. Specifically, strong coupling occurs between the panel and the enclosure. The air inside the shallow enclosure acts like a spring, and the panel can oscillate on the spring at a frequency, usually in the audible range, like a solid body moving back and forth. This resonance produces an uneven frequency response at the output of the l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R1/28H04R7/06H04R1/02H04R7/04
CPCH04R7/045H04R7/06H04R1/2857H04R1/2834
Inventor 尼尔·哈里斯格雷厄姆·班克
Owner NEW TRANSDUCERS LTD