The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 05, 2011
Filed:
May. 07, 2007
Jaap Andre Haitsma, Eindhoven, NL;
Antonius Adrianus Cornelis Maria Kalker, Eindhoven, NL;
Constant Paul Marie Jozef Baggen, Eindhoven, NL;
Job Cornelis Oostveen, Eindhoven, NL;
Jaap Andre Haitsma, Eindhoven, NL;
Antonius Adrianus Cornelis Maria Kalker, Eindhoven, NL;
Constant Paul Marie Jozef Baggen, Eindhoven, NL;
Job Cornelis Oostveen, Eindhoven, NL;
Gracenote, Inc., Emeryville, CA (US);
Abstract
Hashes are short summaries or signatures of data files which can be used to identify the file. The disclosed method generates robust hashes for multimedia content, for example, audio clips. The audio clip is divided into successive (preferably overlapping) frames. For each frame, the frequency spectrum is divided into bands. A robust property of each band (e.g. energy) is computed and represented by a respective hash bit. An audio clip is thus represented by a concatenation of binary hash words, one for each frame. To identify a possibly compressed audio signal, a block of hash words derived therefrom is matched by a computer with a large database. Such matching strategies are also disclosed. In an advantageous embodiment, the extraction process also provides information as to which of the hash bits are the least reliable. Flipping these bits considerably improves the speed and performance of the matching process.