Abstract: The sensor structure according to the invention comprises sensor elements for the detection of objects occurring by measuring an electrical connection and also one or more antenna loops for activating an escort memory tag in connection with reading it. With the loop antennas in the structure of the sensor field according to the invention the reading of an escort memory tag can be activated e.g. in a situation in which an object is detected using a sensor field, in which object an escort memory tag that can be activated with an excitation sent with a loop antenna can be disposed. An advantage of the structure according to the invention is the simplicity of the technical arrangement achieved, and lower costs and better physical durability than prior-art solutions.

Abstract: The invention relates to a digital radio system and to a method for correcting a synchronization error in a digital radio system comprising at least one base station (100) communicating with terminals (102, 104) in its coverage area, and a mobile telephone exchange (108) communicating with the base station and controlling the operation of the base stations. The information to be transmitted is coded and decoded in a transcoder unit (200) into a form suitable for the transmission. The base station sends information frames to the transcoder at a certain pace, and, correspondingly, the transcoder sends information frames to the base station at a certain pace. To ensure easy transmission of information and to increase flexibility, the base station (100) indicates in an information frame sent to the transcoder (200) the synchronization error present in the information frames coming from the transcoder, and the transcoder corrects its synchronization after receiving said message.