Microprocessor-controlled, battery-operated device e.g. mobile telephone, contactless recognition and localization method, involves determining processor activity of stand-by operating device by evaluating field by using measuring circuit

摘要

The method involves determining a processor activity of a stand-by operating device by evaluating a pulse-shaped magnetic low-frequency alternating field by using a frequency-selective electronic measuring circuit. The evaluated field is separated from slowly adjustable fields by the circuit so that an adjusted utilization signal is generated. The generated signal is processed for an acoustic interpretation and/or analysis by a user, while a cladding curve of the signal is formed. The cladding curve signal is transformed with a frequency that is proportional to the signal strength.