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In the acoustic consulting, testing, design and engineering work of the Fraunhofer-Institute of Building Physics (IBP) the low-frequency end of the noise spectra and the room acoustic conditioning has gained tremendous importance over the years. For solving the long-ranging noise pollution from e.g. exhaust stacks and chimneys, a series of low-frequency sound attenuators with minimum flow resistance...
As a research, development and consulting institute the IBP has frequently been confronted with external (intruding from outside) and internal (self-generated inside) noise in communication areas of one kind or another. As a fundamental discovery it has become obvious that the frequency range far below that covered by building and room acoustic standards is of the utmost importance for the sound generation...