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Method for a mobile acoustic sound pressure chamber

IP.com Disclosure Number: IPCOM000018901D
Publication Date: 2003-Aug-20
Document File: 4 page(s) / 1M

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for a mobile acoustic sound pressure chamber. Benefits include improved functionality and improved cost effectiveness.

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Method for a mobile acoustic sound pressure chamber

Disclosed is a method for a mobile acoustic sound pressure chamber. Benefits include improved functionality and improved cost effectiveness.

Background

                  Acoustics have become a focal point for design and sales features on new computers in Europe/Middle East/Africa. To gain any insight into the acoustic output of computer equipment chassis it is necessary to test the chassis in a full-size acoustic chamber or use a commercial acoustic test house and their large static chambers. As a result, a requirement exists for a small, mobile, self-contained acoustic chamber that meets the requirements for sound pressure testing as per ISO 7779. No commercial product is available that meets the requirement.

         Standard acoustic chambers are large static rooms, which are typically isolated from a main building structure. They cost tens of thousands of dollars.

Description

         The disclosed method is a mobile acoustic sound pressure chamber. It is designed into a standard build flight case, 640-mm (W) x 760-mm (D) x 1400-mm (L) external dimensions (see Figures 1-4). The inside is stripped lined with 50-mm thick foam or acoustic material and covered in egg carton foam. The outside is covered in 3-mm thick, high mass, noise barrier material to reduce sound penetration and the vibration of the flight-case sides. The entire case is partially isolated from the building structure by the use of three stacked, acoustically different, low frequency rubber isolating mounts (see Figure 5). The microphone mounting is designed so that the microphone is isolated from the sides of the case when in the operating position.

         The choice of build materials and case is based on cost and availability. The case must meet the criteria for the size of the personal computer to be tested and the distance of the microphone from the equipment under test (EUT). The case must fit through standard single doors. The sound absorbing materials are based on effici...