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:
Mar. 13, 1990
Filed:
Sep. 26, 1988
Katsuo Nagi, Hamamatsu, JP;
Yamaha Corporation, Hamamatsu, JP;
Abstract
A motional load driver for driving a motional load having a motional impedance includes an amplifying section for amplifying an input signal and supplying the input signal to a motional load such as a loudspeaker, a current detecting section for generating an output signal corresponding to a current flowing through the motional load, and a load impedance cancellation current generating section for generating a current corresponding to a magnitude of the output signal generated by the current detecting section and positively feeding back the current to the amplifying section. The current detecting section includes, for example, an impedance element such as a resistor series-connected to the motional load. A voltage between both the terminals of the resistor is converted into a current by a voltage/current converter arranged in the impedance cancelation current generating section, and the current is fed back to the amplifying section. With this arrangement, the motional load can be driven without being influenced by a potential difference between the input and output ground points of the amplifying section.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile