Abstract: The invention relates to a signal level display (2) for an audio device (1), comprising a first lamp (7) of a first color and a second lamp (8) of a second color, and comprising a control device (10) for controlling the lamps (7), (8) on the basis of a signal level to be displayed, wherein the control device (10) is designed to display the signal level in at least three stages by means of the lamps (7), (8), wherein the control device (10) is designed to control at least one of the lamps (7), (8) in such a way that, in order to display the different stages of the signal level, the lamp (7), (8) is operated in at least two different intensities not equal to zero.

Abstract: The invention relates to a signal level display (2) for an audio device (1), comprising a first lamp (7) of a first color and a second lamp (8) of a second color, and comprising a control device (10) for controlling the lamps (7), (8) on the basis of a signal level to be displayed, wherein the control device (10) is designed to display the signal level in at least three stages by means of the lamps (7), (8), wherein the control device (10) is designed to control at least one of the lamps (7), (8) in such a way that, in order to display the different stages of the signal level, the lamp (7), (8) is operated in at least two different intensities not equal to zero.

Abstract: The invention relates to an arrangement (4) of audio devices for the purpose of a public address system, comprising an audio-signal processing apparatus (5) and a configuration apparatus (6), wherein: the audio-signal processing apparatus (5) comprises a first plurality of audio-signal inputs (10), a second plurality of signal outputs (11) and a third plurality of signal paths (9); the signal paths (9) connect audio-signal inputs (10) to signal outputs (11); the audio-signal inputs (10) are designed to pick up a provided audio signal; the configuration apparatus (6) is designed for open-loop control, closed-loop control and/or configuration of the audio-signal processing apparatus (5); the configuration apparatus (6) is designed to switch off signal paths (9), in particular unused and/or undesired signal paths.

Abstract: Larger regions are often acoustically irradiated with a plurality of loudspeakers. A public address system 1 for the sonication of a sonication region 2 is proposed, wherein the public address system has a multiplicity of loudspeakers 3a, 3b, wherein the loudspeakers 3a, 3b are arranged in the sonication region 2 are designed to output an audio signal based on an input signal 4a, 4b. The public address system has a measuring device 5 for the detection of the audio signal at a measurement point 6 in the sonication region 2, wherein the measuring device 5 is designed to determine a propagation time difference ?tn of the audio signals to the measurement point 6 between each of two speakers 3a,b and to provide the propagation time difference ?tn as propagation time difference data.

Abstract: Electrical and electronic devices are often installed in so-called racks. Racks of this type are shelf-like frames into which the devices are inserted and can be fastened, for example by means of screws. The racks commonly provide a pair of support rails for each device, upon which rails the device can be placed and can be inserted into the rack. The device can be subsequently fixed to the rack, for example screwed in.

Abstract: The invention relates to a calibration unit (20) for an audio system (2) having a generator (4) for generating a pilot tone (6), and a detector (16a-c) for the pilot tone (6), wherein at least one parameter (P1, 2) determining the pilot tone (6) is changeable, which calibration unit comprises an input unit (22) for optionally setting the parameter (P1, 2), wherein for at least one value (W1, 2) of the parameter (P1, 2), all detectors indicate a detection of the pilot tone (6). An audio system (2) comprises said calibration unit (20). In a method for operating the calibration unit (20), the parameters (p1, 2) is regulated in such a way that all detectors (16a-c) indicate a detection of the pilot tone (6). A computer program carries out all steps of the method, when the program is performed on a computer and/or the calibration unit (20) or the audio system (2).

Abstract: Larger regions are often acoustically irradiated with a plurality of loudspeakers. A public address system 1 for the sonication of a sonication region 2 is proposed, wherein the public address system has a multiplicity of loudspeakers 3a, 3b, wherein the loudspeakers 3a, 3b are arranged in the sonication region 2 are designed to output an audio signal based on an input signal 4a, 4b. The public address system has a measuring device 5 for the detection of the audio signal at a measurement point 6 in the sonication region 2, wherein the measuring device 5 is designed to determine a propagation time difference ?tn of the audio signals to the measurement point 6 between each of two speakers 3a,b and to provide the propagation time difference ?tn as propagation time difference data.

Abstract: The invention relates to a calibration unit (20) for an audio system (2) having a generator (4) for generating a pilot tone (6), and a detector (16a-c) for the pilot tone (6), wherein at least one parameter (P1, 2) determining the pilot tone (6) is changeable, which calibration unit comprises an input unit (22) for optionally setting the parameter (P1, 2), wherein for at least one value (W1, 2) of the parameter (P1, 2), all detectors indicate a detection of the pilot tone (6). An audio system (2) comprises said calibration unit (20). In a method for operating the calibration unit (20), the parameters (p1, 2) is regulated in such a way that all detectors (16a-c) indicate a detection of the pilot tone (6). A computer program carries out all steps of the method, when the program is performed on a computer and/or the calibration unit (20) or the audio system (2).

Abstract: Electrical and electronic devices are often installed in so-called racks. Racks of this type are shelf-like frames into which the devices are inserted and can be fastened, for example by means of screws. The racks commonly provide a pair of support rails for each device, upon which rails the device can be placed and can be inserted into the rack. The device can be subsequently fixed to the rack, for example screwed in.