Sony Corporation

Nissan Motor Company Limited

Takashi Shima

Koji Miura

Toshihiko Masuda

Tetsuro Hirohama

Takahiro Maekawa

Toshiki Watanabe

Shingo Niinuma

A display rack, on which a display apparatus is mounted, is provided. The display rack includes an amplifier, a top board portion, a transparent top board portion, and a display portion. The amplifier amplifies an audio signal input from a signal source of the display apparatus. The top board portion stores the amplifier. The transparent top board portion is formed of a transparent member and arranged above the top board portion. The display portion indicates a status of the amplifier and is arranged under the transparent top board portion with a display surface thereof facing upward.

Display rack

A storage rack capable of storing an audio apparatus is provided. The storage rack includes: a top board portion, at least two leg portions, a shelf board portion, and a speaker storage portion. The top board portion supports the audio apparatus. The at least two leg portions hold the top board portion. The shelf board portion is vertically joined to a side surface of the respective leg portions and in parallel with the top board portion with an adjustable distance thereto. The speaker storage portion is arranged under the shelf board portion. The speaker storage portion is arranged at a position having a predetermined distance in the depth direction of the shelf board portion.

Storage rack

A reduction is made in signal distortion that occurs in an output signal of a PWM switching power amplifier due to noise disturbances from a switching power supply. In a switching power amplifier that has a switching power supply unit, a clock signal for controlling the switching of the switching power supply unit is generated based on a clock signal that is used to synchronize switching operations. The clock signal has a clock period that is an integer multiple of a period t of the clock signal and matches a timing at which a signal level of a PWM power signal that is generated by the switching power amplifier is at ground level. The switching of the switching power supply unit is synchronized using the clock signal.

Switching power amplifier, and switching control method for a switching power amplifier

A digital power amplifier includes a pulse width modulator for converting an input signal into a pulse width modulated signal according to a signal level of the input signal; an output stage, switching thereof being controlled by the pulse width modulated signal generated by the pulse width modulator; a pulse width modulation ratio detector for detecting a pulse width modulation ratio of the pulse width modulated signal generated by the pulse width modulator; and a control unit for disabling the switching operation of the output stage. The control unit disables the switching operation of the output stage when the pulse width modulation ratio detector detects that the pulse width modulation ratio is 50%.

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Kanagawa, Japan

Takashi Shima