Patent №
US 5,113,437
Granted
1992-05-12
Filed 1989
Owner
THORN EMI PLC, A COMPANY OF GREAT BRITAIN
+2 more
Lab
—
AI components
1
evo
Assignment
Recorded
Dataset
AIPD
2023_r1 edition
Application
07426284
A signal identification system, suitable for producing an identification code on a sound track recording is described. The system includes an encoder 209 effective to eliminate a variable sequence of frequency bands from an audio signal and insert a sequence of code signals into the frequency bands. As the sequence of frequency bands varies throughout the sound track recording, the presence of the code is difficult to detect.
AI classification
Ownership
THORN EMI PLC, A COMPANY OF GREAT BRITAIN
assignment · 52010576
CENTRAL RESEARCH LABORATORIES LIMITED
assignment · 80980053
MEDIAGUIDE HOLDINGS, LLC
assignment · 230560101
Assignors
BEST, STUART J., JOHNSON, NIGEL, SANDFORD, ADRIAN M.
On an employer assignment, the assignors are typically the inventors.