Abstract: The invention relates to a device for measuring the sound insulation or insertion insulation of a test object, particularly a passenger compartment section of a motor vehicle, wherein said device comprises at least one source of sound, at least one microphone and a device for recording acoustic measuring data. In order to generate a largely homogenous sound field in a sound-absorbing environment, e.g., the interior of a motor vehicle, by means of such a device for the purpose of technical measurements, the invention proposes that the source of sound is formed by a single portable loudspeaker or compression driver (1) that is provided with an adapter (3) containing a plurality of sound openings (7) with flexible tubes (8.1, 8.2, 8.3, 8.n) connected thereto, wherein the open ends (9) of the tubes (8.1, 8.2, 8.3, 8.n) define a plurality of separate punctiform sources of sound.

Abstract: The invention relates to a floor covering for motor vehicles, comprising a tufted velour carpet layer. The floor covering has a tuft carrier carrying pile knots and provided with longitudinal rows of tufts, comprising zigzagged back-stitches, on the lower side thereof. In order to reduce the weight of one such motor vehicle carpeted floor system and to improve the acoustic efficiency, the tuft carrier comprises a plurality of perforations defining gaps between the pile knots, the perforations being produced by tufting needles without pile yarns.

Abstract: The present invention relates to a test stand, particularly a ceiling test stand (1) for determining the sound insulation or insertion loss of a test object (2), particularly a vehicle floor, having a transmission chamber (3), which has multiple sound transmitters (8) and a test opening (4) for positioning the test object (2), and at least one microphone (12), which is positioned outside the transmission chamber, in front of the test opening (4).

Abstract: The invention relates to a test stand and a method for measuring sound insulation or insertion loss on a test object. The test stand includes a transmitting chamber (1) provided with a plurality of sound transmitters (6) and an adjacent receiving chamber (2), which is separated from the transmitting chamber by a dividing wall (3) or dividing floor with a test aperture for arranging the test object (4). The transmitting chamber is provided with a sound transmitter array (5), which includes at least four sound transmitters (6), that are arranged in a plane that extends essentially parallel to the dividing wall (3) or dividing floor. A controlling means is assigned to the sound transmitters (6), and the sound transmitters are controlled thereby so as to create optionally either a diffuse sound field or an essentially unidimensional sound field directed towards the test object (4).