Yamaha Corporation

Takashi Handa

Takaaki Makino

Koichi Matsuno

Akihiro Nagayama

Toshiro Mayuzumi

Yosuke Harada

Haruo Okuyama

A display device for a musical instrument includes a touch panel and a switcher. The touch panel is placed to be adjacent to an exterior member that constitutes appearance of the musical instrument. The switcher switches appearance of the touch panel between a first mode and a second mode in which the appearance of the touch panel is closer to appearance of the exterior member than in the first mode.

Display device for musical instrument and display switching method of display device for musical instrument

Common mode choke coil device includes four coils wound on a core in a same direction. Hot-side outputs of first and second class-D amplifiers are connected to respective ones of first ends of two of the four coils, and first and second hot-side output terminals are connected to respective ones of second ends of the two coils. Ground-side outputs of the first and second class-D amplifiers are connected to respective ones of the first ends of remaining two of the four coils, and first and second ground-side output terminals are connected to respective ones of the second ends of the remaining two coils. Single-end connection is realized by connecting a separate load to each of the class-D amplifiers via the corresponding first (or second) hot-side and ground-side output terminals. BTL connection is realized by connecting a single load to the class-D amplifiers via the first and second hot-side output terminals.

Power amplifier and common mode choke coil apparatus

Growing community of inventors

Jakarta Selatan, Indonesia

Takashi Handa