ALEXANDRIA, Va., July 15 -- United States Patent no. 12,664,991, issued on June 23, was assigned to Dolby International AB (Dublin).

"Encoding of envelope information of an audio downmix signal" was invented by Harald Mundt (Furth, Germany).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for encoding envelope information is provided. In some implementations, the method involves determining a first downmixed signal associated with a downmixed channel associated with an audio signal to be encoded. In some implementations, the method involves determining energy levels of the first downmixed signal for a plurality of frequency bands. In some implementations, the method involves determining whether to enco...