System for collecting data.

摘要

System for collecting data, relating to the showing of specific video information registered together with a code signal onto a registration carrier. The carrier is forwarded by the information supplier to one of a number of display stations comprising each at least a video display apparatus for displaying the registered video information and comprising a processor for detecting said code signal and deriving therefrom data about the starting time and the period during which said video information is displayed. This data being is stored into a memory and the contents of the memory is at regular intervals read out by the information supplier using a reader station.