An Active Broadband Sound Isolation Device for Wall Ventilation

Abstract

The invention discloses an active broadband sound insulation device for wall ventilation. It consists of a rectangular opening with a side length of 6‑8 cm and a depth of not less than 10 cm and a 4-channel active noise reduction system. In the noise reduction system, the four secondary sound sources are respectively installed in the center of the four walls of the opening, the reference microphone is installed on the side of the opening close to the noise source, and the four error microphones are respectively installed on the side of the opening close to the target noise reduction area On the four walls of , the controller adopts a feed-forward adaptive algorithm. The controller controls the output of the secondary sound source to minimize the sum of the squares of the sound pressure amplitude at the error microphone, forming an acoustic soft boundary at the section of the opening, and reflecting sound waves to reduce transmitted sound energy. Under the conditions of satisfying natural ventilation and lighting, the present invention has sound insulation effect, wide sound insulation frequency band, good effect and strong practicability.

Description

1. Technical field [0001] The invention relates to a sound insulation device, in particular to an active broadband sound insulation device for wall ventilation. 2. Background technology [0002] In some buildings, it is often necessary to open on the wall to ensure ventilation and light transmission, but general wall openings do not have the function of noise reduction and noise reduction. In some applications, because the openings cannot silence the noise, it will cause noise to pass through and form pollution; in other applications, the openings will cause voice leakage and reduce the language privacy of the room. [0003] In order to improve the sound insulation of wall openings, the traditional method is to adopt passive noise reduction measures, such as adding sound-absorbing materials to the openings, so as to have a sound-absorbing function; The distance from one side of the opening to the other side improves the sound attenuation performance of the opening. Active ...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the passive noise reduction of wall openings has a small sound insulation in the low frequency band and the active noise reduction of large openings has poor effect in the high frequency band, the present invention provides an active broadband sound insulation device for wall ventilation

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