ALEXANDRIA, Va., July 28 -- United States Patent no. 12,694,862, issued on July 28, was assigned to AUSTRIAN AUDIO GMBH (Vienna).

"Active noise control classification system" was invented by Ludwig Kollenz (Wolkersdorf, Austria), Michael Perkmann (Vienna) and Daniel Wohrer (Gablitz, Austria).

According to the abstract* released by the U.S. Patent & Trademark Office: "Methods of classifying and using acoustic filters for active noise control in hearing systems, such as headphones. The acoustic filters are determined and stored in a memory in the hearing system, making it therefore possible to quickly and efficiently select and use a certain filter in order to improve filter performance and filter stability in the hearing system."

The pate...