Method, apparatus and system for recognizing broadcast segments
US4739398A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 2, 1986 |
| Grant date | Apr 19, 1988 |
| Priority date | — |
| Expiry date | May 2, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04H60/59
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method, apparatus and system are provided for recognizing broadcast segments, such as commercials, in real time by continuous pattern recognition without resorting to cues or codes in the broadcast signal. Each broadcast frame is parametized to yield a digital word and a signature is constructed for segments to be recognized by selecting, in accordance with a set of predefined rules, a number of words from among random locations throughout the segment and storing them along with offset information indicating their relative locations. As a broadcast signal is monitored, it is parametized in the same way and the library of signatures is compared against each digital word and words offset therefrom by the stored offset amounts. A data reduction technique minimizes the number of comparisons required while still maintaining a large database.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.