In some sound absorption applications, it is necessary to use more than one reactive absorbers (such as quarter-wave tubes or Helmholtz resonators) all tuned to the same frequency. Close placement of these resonators can have an adverse impact on their effectiveness. When such devices are placed along the direction of variation in the shape of […]
Read MoreLarge vehicles, such as SUVs (Sport Utility Vehicle) and minivans, exhibit body boom phenomena during multiple source excitation events including rough road/impact and powertrain induced events. The main cause of the boom is the low-frequency acoustic/vibro-acoustic modes of the cavity being excited via the high acoustic transfer functions at multiple paths, due to an inherently […]
Read MoreReactive absorbers, such as Helmholtz resonators (HR) or quarter-wave tubes, are commonly used as the most effective solution for abating the low-frequency tonal noise in many applications including the quieting of air intake induction system noise in internal combustion engines. The problem with these low-frequency absorbers is their large size. In addition, reactive absorbers can […]
Read MoreA small room is used to evaluate how DEICON’s patented, active acoustic damping technology, ‘electronic bass trap’, enhances low-frequency musical articulation in that room The rectangular room has a dominant coloration due to the 32 Hz standing wave that shapes up along its length. Electronic bass trap is used to add damping to the first […]
Read MoreDEICON’s patented, feedback-controlled, electronic acoustic absorber is highly effective in reducing the boominess of sound at frequencies corresponding to offending (coloring) standing waves of an enclosed space. The controller which can be realized by a tunable, analog circuit or a high-speed micro-controller can be tuned to one or multiple low frequencies either to dampen the […]
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