Broadcast program identification method and apparatus
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United States of America Patent
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-
Jun 30, 1987
Grant Date -
N/A
app pub date -
Jul 29, 1985
filing date -
Jul 29, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
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.
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