Method and device for data-acquisition for polling of television-audience.

摘要

A "plug-in" adaptor at the TV antenna connection (1) serving a receiver (4) and two VCRs (2, 3) introduces a burst signal (5) into the incoming video signal, from a burst generator (6) producing a pure sinusoid for each channel frequency at a constant offset from the vision carrier frequency. The processor (14) determines the burst frequency and the pref. invisible line into which it is inserted. Near the receiver a printed spiral winding (19) picks up the burst signal and relays in to an evaluation circuit (20) for transmission (23) to a centre.