The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 14, 2015
Filed:
Nov. 13, 2014
Panasonic Corporation, Osaka, JP;
Roland Corporation, Hamamatsu-shi, Shizuoka, JP;
Hiroshi Sugawara, Fukuoka, JP;
Hisayuki Sasaki, Fukuoka, JP;
Shigeki Niwayama, Shizuoka, JP;
Yoshiki Maeda, Shizuoka, JP;
Toshimi Takano, Shizuoka, JP;
PANASONIC CORPORATION, Osaka, JP;
ROLAND CORPORATION, Shizuoka, JP;
Abstract
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.