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2 results about "Reverberation room" patented technology
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A reverberation chamber or room is a room designed to create a diffuse or random incidence sound field (i.e. one with a uniform distribution of acoustic energy and random direction of sound incidence over a short time period). Reverberation chambers tend to be large rooms (the resulting sound field becomes more diffused with increased path length) and have very hard exposed surfaces. The change of impedance (compared to the air) these surfaces present to incident sound is so large that virtually all of the acoustic energy that hits a surface is reflected back into the room. Arranging the room surfaces (including the ceiling) to be non-parallel helps inhibit the formation of standing waves - additional acoustic diffusers are often used to create more reflecting surfaces and further encourage even distribution of any particular sound field.
An electrically powered intelligent control system for acoustic reverberation chamber soundproof doors
The application discloses an electric intelligent control system for a soundproof door of an acoustic reverberation chamber, which comprises a control cabinet, a door driving mechanism, a cover plate driving mechanism, a sealing air bag control mechanism, a sensing detection mechanism and an electrical connection mechanism. The application realizes full-automatic intelligent control of the opening and closing, sealing and safety detection of the soundproof door through PLC centralized control and multi-stage sensing feedback, significantly improves the use efficiency and sound insulation performance of the reverberation chamber, reduces manual operation errors, has the advantages of reasonable structure, rapid response, high control precision and convenient maintenance, and can greatly improve the automation and reliability level of environment control of an acoustic test chamber.
Owner:BEIJING INST OF SPACECRAFT ENVIRONMENT ENG
Testing device for acoustic signal transmitters, especially those of fire alarm systems
Test device (1) for the functional testing, in particular in accordance with standards and / or standardization, of an acoustic signal generator (2), in particular an acoustic signal generator (2) of a fire alarm system, in particular for conformity testing in accordance with the requirements of and / or in accordance with DIN EN 54-3, in particular by measuring and / or evaluating a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator (2), wherein the test device (1) comprises: - a reverberation chamber (3), in particular a box-shaped reverberation chamber, in particular wherein the reverberation chamber (3) comprises a plurality of chamber walls (4), in particular six chamber walls (4), and / or is composed of a plurality of chamber walls (4), in particular six chamber walls (4), preferably wherein the reverberation chamber (3) is bounded and / or formed by the chamber walls (4), - a device arranged in the reverberation chamber (3),preferably pivotably and / or rotatably mounted and / or attached, microphone (5) for detecting and / or recording an acoustic signal (warning signal) generated by the acoustic signal generator (2), in particular for detecting and / or recording a sound pressure level of an acoustic signal (warning signal) generated by the acoustic signal generator (2), in particular wherein the microphone (5) is arranged and / or attached and / or mounted on a chamber wall (4) of the reverberation chamber (3) by means of a microphone holding device (6), in particular pivotably and / or rotatably, - a test specimen holder (7) arranged in the reverberation chamber (3) for holding and / or receiving an acoustic signal generator (test specimen) (2) to be tested, in particular wherein the test specimen holder (7) is attached to a chamber wall (4), preferably to a chamber wall (4) opposite the microphone (5),preferably arranged and / or attached to one of the chamber walls (4) opposite the microphone holding device (6) for the microphone (5); wherein at least one ventilation opening (8A, 8B), preferably a perforation, is arranged and / or provided on and / or in at least one chamber wall (4), in particular for the preferably defined and / or predetermined inlet and / or outlet of air, preferably test atmosphere, into and / or out of the reverberation chamber (3) and / or in particular for the preferably defined and / or predetermined setting of environmental stress conditions in the reverberation chamber (3).
Owner:VDS SCHADENVERHUETUNG GMBH