The invention relates to a throttle plate port whose pivot axis is disposed so as to be axially offset with respect to the throttle plate and whose radial peripheral surface is shaped, at least by sections, in the form of spherical sectors, where in the position which closes the bore the peripheral surface of the throttle plate abuts, in the form of a line, the seat face of the housing. One embodiment of a method for encoding a data stream to enable error correction by a receiver of the data stream includes storing a block of the data stream in a first memory array, processing the first memory array to produce a second memory array, inverting the second memory array, and storing the second memory array, as inverted, as a third memory array. The collapsible lens is driven and controlled in accordance with a camera operation mode. Items can also be flushed from cache on this basis.