An airbag cover, in particular for use in motor vehicles, is disclosed. The apparatus is particularly useful for forming pressed paperboard containers such as paper plates. The modulation circuit is configured to modulate the audio signal and the DC voltage. Fitted releasably into the gas analyzer are one or more plates, into which at least one separating channel is respectively integrated. The solving for the low rank component and the sparse component is repeated alternately until a termination condition is reached.