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:
Nov. 06, 2012
Filed:
Sep. 03, 2008
Yuma Kawai, Kobe, JP;
Koji Kawaguchi, Kobe, JP;
Yuma Kawai, Kobe, JP;
Koji Kawaguchi, Kobe, JP;
TOA Corporation, Kobe-Shi, Hyogo-Ken, JP;
Abstract
[Object] To downsize a power amplifier, while keeping isolation between a transmission line and ground potential. [Means to Realize Object] Two terminals () of an audio signal source () are connected to an input of an isolation input circuit (). An audio signal developed, being isolated from the input-side, between two output-side terminals () of the isolation input circuit () are inputted to a power amplifying stage (). The power amplifying stage () amplifies the audio signal and outputs it at a high voltage from two output terminals () to a plurality of loudspeakers () without using an insulation transformer. Operating power is supplies to the power amplifying stage () from two power supply terminals () of a DC power supply (). One () of the terminals of the insulation input circuit (), one () of the output terminals of the power amplifying stage () and one () of the power supply terminals of the DC power supply () are connected together to provide a common potential point different from the ground potential.