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1. (WO2005065159) METHODS AND APPARATUS TO DISTINGUISH A SIGNAL ORIGINATING FROM A LOCAL DEVICE FROM A BROADCAST SIGNAL

Pub. No.:    WO/2005/065159    International Application No.:    PCT/US2004/041670
Publication Date: Fri Jul 22 01:59:59 CEST 2005 International Filing Date: Sat Dec 11 00:59:59 CET 2004
IPC: H04N 17/00
Applicants: NIELSEN MEDIA RESEARCH, INC.
RAMASWAMY, Arun
NELSON, Dan
Inventors: RAMASWAMY, Arun
NELSON, Dan
Title: METHODS AND APPARATUS TO DISTINGUISH A SIGNAL ORIGINATING FROM A LOCAL DEVICE FROM A BROADCAST SIGNAL
Abstract:
Methods and apparatus to distinguish a signal originating from a local device (102) from a broadcast signal are disclosed. A disclosed system classifies a video component of an audio-video signal by analyzing a histogram of pixel data (408), analyzing a quality factor (409), and/or attempting to detect embedded data (410) in the video component. The disclosed system also classifies an audio component of the audio-video signal by attempting to detect embedded audio data and/or analyzing waveform energy associated with the audio component. A source of the audio-video signal is determined based on the video classification and/or the audio classification.