Patent ID: 7471987
Filing Date: 2008-12-30
Classification: H04H

Abstract:
1. A portable media monitor for gathering data to produce estimates of media audiences based on acoustic energy emitted by a media receiver, the portable media monitor capable of being carried on the person of an audience member, the portable media monitor comprising: acoustic transducer for producing transducer output data in response to received acoustic energy including acoustic energy from a media receiver; audience measurement code detector for detecting audience measurement codes emitted acoustically from the media receiver based on the transducer output data to produce detected audience measurement code data; location code detector for detecting a location code transmitted wirelessly from a location code emitter in a predetermined area in which the media receiver is located, to produce detected location code data relating to the audience member, wherein the location code detector comprises a radio frequency receiver for receiving the location code as a radio frequency transmission; means for supplying power to operate the radio frequency receiver in response to detection of an audience code by the audience measurement code detector; and a communicator for communicating the detected audience measurement code data and the detected location code data to an audience estimate producing system for producing audience estimate data based on the detected audience measurement code data and the detected location code data.