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:
Dec. 20, 2011
Filed:
Feb. 04, 2008
Applicants:
Ming-hung Tsai, Fongshan, TW;
Tung-tsai Liao, Hsinchu, TW;
Inventors:
Ming-Hung Tsai, Fongshan, TW;
Tung-Tsai Liao, Hsinchu, TW;
Assignee:
Generalplus Technology Inc., Hsinchu, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04R 5/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A circuit for eliminating pop sounds at power on and off by a moderate waveform, which includes a switch, a feedback network, an operational amplifier and an output network. When power-on, a first input terminal of the switch is connected to a low voltage, and an output terminal of the output network provides an operating DC bias which is gradually increased. When power-off, the first input terminal of the switch is connected to a reference voltage, and the output terminal of the output network provides an operating DC bias which is gradually reduced.