05612729 is referenced by 232 patents and cites 22 patents.

A method and system for producing a signature which characterizes an audio broadcast signal for use in broadcast signal recognition, wherein the signature is based on a comparison of time-displaced frequency band values each representing a respective frequency band of the audio broadcast signal. Each of a first group of the frequency band values is compared with a respective value from the second group representing portions of the audio broadcast signal within the same predetermined frequency band. At least a part of the signal portions represented by the second group were broadcast prior to the signal portions represented by the first group, and a signature is formed based on the comparison of the first and second groups.

Title
Method and system for producing a signature characterizing an audio broadcast signal
Application Number
876578
Publication Number
5612729
Application Date
June 7, 1995
Publication Date
March 18, 1997
Inventor
Richard S Land
Lafayette
CO, US
David L Clifton
Boulder
CO, US
David M James
Fort Collins
CO, US
Fancy B Younglove
Boulder
CO, US
Michael W Fellinger
Boulder
CO, US
Stephen M Dunn
Boulder
CO, US
Michael D Ellis
Boulder
CO, US
Agent
Curtis Morris & Safford P C
Agent
Eugene L Flanagan III
Assignee
The Arbitron Company
MD, US
IPC
H04N 17/04
H04N 17/00
View Original Source