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1. (MXPA/a/2000/011625) AUDIENCE RATING SYSTEM FOR DIGITAL TELEVISION AND RADIO

Pub. No.:    PA/a/2000/011625    International Application No.:    PA/a/2000/011625
Publication Date: Sat Sep 08 01:59:59 CEST 2001 International Filing Date: Sat Nov 25 00:59:59 CET 2000
IPC: H04N 7/16
Applicants: MASSETTI, Enrico, Emilio
Inventors: MASSETTI, Enrico, Emilio
Title: AUDIENCE RATING SYSTEM FOR DIGITAL TELEVISION AND RADIO
Abstract:
An audience rating system for digital television and radio, using identification codes in control streams (C) of time-multiplexed digital transmissions (12). When a television set (22) or radio, that is being monitored pursuant to the system is turned on and tuned to a channel, and each time that the channel is changed, an identification code for each audio, video or auxiliary digital stream of the channel is extracted from the control stream, and recorded along with the time. The time is also recorded when the television set or radio is turned off. This data makes it possible to determine what stations, channels, and programs members of the audience being monitored are watching or listening to at any particular time.