Abstract: The invention provides both a system, device and method for emulating a plurality of RF data storage devices in a single device, for example a hand held device such as a mobile phone. The system comprises a means for emulating a plurality of RF data storage devices each having a different identifier, control means for controlling the transmission simultaneously or sequentially of two or more of the identifiers in response to receipt of a signal from a reader, and means for transmitting simultaneously or sequentially two or more of the said identifiers. In one embodiment the transmission of the identifiers emulates the sequential transmission of two or more identifiers in accordance with a collision avoidance protocol. Alternatively or additionally the transmission of the identifiers emulates the simultaneous or sequential transmission of two or more different identifiers in accordance with a collision detection protocol.

Abstract: A bandwidth reduction system for television signals employs three spatial filter circuits capable of imposing respective resolution characteristics on the signals. The filters are selectively switched into the path of the signals in dependence upon the degrees motion occurring in respective spatial portions of the television picture. A relatively high resolution is allowed where virtually no movement is taking place and a relatively low resolution where rapid movement is taking place. Intermediate resolution is imposed where the degree of motion in a given spatial portion of the television picture is finite but less than said rapid movement.