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Acoustic filter device for high-directivity audio loudspeaker measuring system

A filter device and measurement system technology, applied in the direction of electrical components, etc., can solve the problems of false noise and high sound pressure level, and achieve the effect of reducing false noise in measurement

Active Publication Date: 2013-09-11
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, at the same time in the near-field region ultrasonic waves p 1 and p 2 and audible sound waves p d , and due to ultrasonic p 1 and p 2 The sound pressure level is relatively high, especially in the near field, it is generally above 120dB, so when the microphone is used to measure directly in this area, false noise will be generated

Method used

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  • Acoustic filter device for high-directivity audio loudspeaker measuring system

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] In order to better understand the present invention, the present invention will be described in further detail below in conjunction with accompanying drawing and specific embodiment:

[0029] The present invention is to provide an acoustic filter device with low-pass characteristic to filter out ultrasonic components while retaining audible sound waves. The technical solution is:

[0030] Acoustic filtering device for highly directional audio loudspeaker measurement system, including: front panel, bracket and base.

[0031] The acoustic filtering device described above is characterized in that the microphone passes through the through hole in the center of the base, so that the front panel is mounted on the front end of the microphone through a bracket.

[0032] The front panel is characterized in that the diameter is greater than 12 mm, so as ...

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Abstract

The invention relates to an acoustic filter device for a high-directivity audio loudspeaker measuring system, which is characterized in that the acoustic filter device comprises a base (1), a microphone (2), a support (3) and a front panel (4); a through hole is arranged in the center of the base (1) and is used for arranging the microphone (2) in a penetrating way; the front panel (4) is fixed right ahead the microphone (2) through the support (3); and the front panel (4) is made of a metal material with Brinell hardness number being more than 100HB. The acoustic filter device provided by the invention has a low-pass characteristic, can greatly attenuate ultrasound and has a small impact on audio sounds. Thereby, measurement pseudo noises caused by the microphone can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of acoustic measurement, in particular to an acoustic filter device used in a measurement system of a high directivity audio frequency loudspeaker. Background technique [0002] The high-directional audio speaker system is a new type of speaker system that can emit directional audible sound in a specific direction. It is based on the principle of parametric array and modulates the audio signal onto the ultrasonic carrier. After being emitted by the ultrasonic transducer array, due to Non-linear action in the air, producing highly directional audible sound. High directivity audio speakers can be widely used in the fields of sound wave directional transmission, secure communication and so on. [0003] When the frequencies of the two columns are f 1 and f 2 Ultrasonic p 1 and p 2 After being emitted by the ultrasonic transducer, due to the nonlinear effect in the air, multiple sound waves of different freq...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R29/00
Inventor 叶超匡正吴鸣杨军
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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