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Pat. 9985518 United States, Int. Cl.22 H03F 99/00, G10H 1/32, G10H 3/18, H02J 7/34, H02M 1/32, H02M 3/04, H03F 3/187, H04R 3/00, G06F 1/26, G10H 1/46, H02J 1/10, H02J 3/00, H02J 7/00, H02M 1/00, H02M 3/00, H03F 3/181. Circuit and musical instrument : Appl. N 15/409710 : Filed 19.01.2017 : Pub. 29.05.2018 : / Jun Ishii, Satsuki Kawahashi, Takeshi Kono, Yoshiyuki Harada ; Assignee Yamaha Corp ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US9985518/en?oq=US9985518.html (дата обращения: ДД.ММ.ГГГГ).