ALEXANDRIA, Va., Dec. 16 -- United States Patent no. 12,499,905, issued on Dec. 16, was assigned to HITACHI LTD. (Tokyo).

"Emotion recognition system and emotion recognition method" was invented by Takashi Sumiyoshi (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "An emotion recognition system includes an input unit configured to input first speech data and second speech data, and a processing unit configured to input the first speech data and the second speech data to a differential-emotion recognition model that infers a differential emotion between two pieces of speech data, and acquire, from the differential-emotion recognition model, differential-emotion information indicating a differential emotio...