04677466 is referenced by 647 patents and cites 14 patents.

A method and apparatus for identifying repetitively broadcast programs, such as commercial advertisements broadcast on television and radio, detects the occurrence of predetermined events in a video signal and/or in an audio signal, detects a stability condition and extracts a signature from the video and/or audio signal. The signatures and the times of occurrence of the signatures are stored and subsequently compared with reference signatures to identify the program and its time of broadcast. The reference signatures may be obtained by identifying repetitively extracted, unidentified signatures and indexing a recording of the video and/or audio signals to enable the system user to identify the unidentified broadcast program and store the previously unidentified signatures as additional reference signatures in memory.

Title
Broadcast program identification method and apparatus
Application Number
6/760328
Publication Number
4677466
Application Date
July 29, 1985
Publication Date
June 30, 1987
Inventor
Daozheng Lu
Dunedin
FL, US
John G Lert Jr
Tampa
FL, US
Agent
Mason Kolehmainen Rathburn & Wyss
Assignee
A C Nielsen Company
IL, US
IPC
H04N 17/00
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