Vacuum cleaner filters, in particular replaceable vacuum cleaner filters suitable for both dry and wetdry type vacuum cleaners are disclosed, as well as systems incorporating the use of such filters and methods for their use. In the condition determining, the communication control unit determines which of a plurality of conditions set in advance to be narrowed down to one has been established, based on a post-internal decoding residual error detection ratio. As a cartridge pushes the sled, a sliding pin extended from the wiper holder moves in an L-shaped slit of the sled, allowing the end of the wiper holder to move upward. The library module includes a plurality of computer aided processes. The Dirac-like pulses are structured to produce a particular output in the manufactured object.