Panasonic Corporation

Roland Corporation

Shigeki Niwayama

Hiroshi Sugawara

Hisayuki Sasaki

Toshimi Takano

Yoshiki Maeda

A digital amplifier includes a switch, a driving unit, an input signal detector, a control unit and a delay unit. The switch amplifies a signal input to the digital amplifier. The driving unit turns the switch on and off. The input signal detector detects whether an input signal is input to the digital amplifier. The control unit controls the switch to start switching when a signal is input to the digital amplifier and detected. The control unit controls the switch to stop the switching operation by stopping the driving of the driving unit, when the signal is not input to the digital amplifier and not detected. The delay unit delays an input signal to the digital amplifier by a predetermined time until the switching is started, so as to be transmitted to the switch. The switch amplifies the input signal sent to the digital amplifier via the delay unit.

Digital amplifier

A digital amplifier comprises: a switching unit that amplifies a signal input to the digital amplifier by performing a switching operation; a driving unit that turns the switching unit on and off; an input signal detection unit that detects an input signal to the digital amplifier; and a first control unit that performs control such that the switching unit starts a switching operation by starting driving of the driving unit, when the digital amplifier is changed to a signal input state and the input signal detection unit detects an input signal, and performs control such that the switching unit stops the switching operation by stopping the driving of the driving unit, when the digital amplifier is changed to a no signal input state and the input signal detection unit does not detect an input signal. This configuration enables to reduce power consumption when no signal is input.

Growing community of inventors

Shizuoka, Japan

Shigeki Niwayama