H - Electricity – 04 – H
Patent
H - Electricity
04
H
H04H 60/31 (2008.01)
Patent
CA 2485245
Methods and apparatus for encoding and decoding information in broadcast or recorded segment signals are described. In certain embodiment, an audience monitoring system encodes identification information x(w) in the audio signal portion of a broadcast or recorded segment using spread spectrum encoding. A personal monitoring device receives an acoustically reproduced version of the broadcast or recorded signal via a microphone, decodes the identification information from the audio signal portion despite significant ambient noise and stores this information, automatically providing a diary for the audience member which is later uploaded to a centralized facility. A separate monitoring device decodes additional information from the broadcast signal, which is matched with the audience diary information at the central facility. This monitor may simultaneously send data to the centralized facility using a dial-up telephone line, and receive data from the centralized facility through a signal encoded using a spread spectrum technique and modulated with a broadcast signal from a third party.
Aijala Victor A.
Cohen Gerald B.
Jensen James M.
Lynch Wendell D.
Urbi Juan C.
Arbitron Inc.
Ceridian Corporation
Perry + Currier
LandOfFree
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