An inventive method obtaining film grains from a picture and processing the obtained film grains using a statistical distribution to determine new film grains. Space-borne global positioning system data of ionospheric delay are obtained from a satellite. The clasp includes a safety catch that has a first protuberance that is adapted to open and close the safety catch. The processor is configured to identify the fault by determining a family of frequencies related to at least one failure mode of the impeller, decomposing the input signals using the family of frequencies, reconstructing a impeller signal using the decomposed input signals, and comparing the reconstructed impeller signal to a baseline signal. In this manner, retransmission does not require regeneration of the original call setup messages nor multiplexing.