Abstract: In a method for performing a frequency analysis of an AC voltage signal, in particular in a power mains, an upper limit of the period length of a fundamental oscillation in the AC voltage signal is determined. A sequence of sampling values of the AC voltage signal is obtained over a duration longer than the upper limit of the period length, thereby ensuring that more than a period of the fundamental oscillation is sampled. Selected from the sequence of sampling values is a subset of sampling values, with the subset sampling substantially one period of the fundamental oscillation. At least a portion of the sampling values not included in the subset is altered, and a frequency is calculated based on the obtained sequence of sampling values, the subset of sampling values and the altered portion of the sampling values.

Abstract: The invention relates to an audiovisual arrangement comprising a planar element that is embodied for representing image data and can be triggered to emit light and a planar, rigid element which is configured for generating sound data and can be excited to perform transversal bending vibrations and thus emit sound. In order to be able to configure devices comprising generic audiovisual arrangements in a particularly compact fashion while dispensing with components if necessary, the sound-generating element is embodied substantially coextensive to the light-emitting element.