| 摘要 |
An interactive television or video system is disclosed, for communicating questions, means for distributing an encoded data channel in combination with the video signal for communicating qualification data, means at the user terminals for entering answer data (44), assessing the answer data against the qualifying data, and scoring the answer data to provide user scores, means for polling the user terminals to compare their user scores with an iteratively altered qualifying score level until the number of qualifying terminals falls within a predetermined range, and means to collect data from the then qualified terminals. The qualification data is preferably a subset or surrogate of data representing wanted answers. The encoded data is preferably transmitted as pie-charts (35) superimposed on images which are broadcast (48), the pie-charts being decoded by transducers affixed to the screens (49) of user terminals. |
