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Pat. 11284192 United States, Int. Cl.22 H02M 3/155, H03F 3/183, H04R 3/00, H04R 17/00. Speaker driver and operation method thereof : Appl. N 16/610206 : Filed 15.06.2018 : Pub. 22.03.2022 : / Ki Tae Park, Jin Sung Kim, Kyu Don Choi, Hwang Soo Son ; Assignee Iron Device Corp ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11284192/en?oq=US11284192.html (дата обращения: ДД.ММ.ГГГГ).