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:
Feb. 20, 1996
Filed:
Dec. 20, 1993
Robert E Pulfrey, Bel Air, MD (US);
Other;
Abstract
A high fidelity sound reproducing system includes at least one dynamic speaker having a voice coil operatively driving a diaphragm. A differential power amplifier has an output coupled to the voice coil of the dynamic speaker and a noninverting (+) input connected to an audio signal source for driving the speaker in accordance with an input audio signal. A measuring transducer is associated with the dynamic speaker for generating a first feedback signal proportional to the velocity of the dynamic speaker diaphragm. The measuring transducer may be positioned in front of the speaker, behind the speaker or within the bore of the speaker. An active differentiating signal amplifier has an input coupled to the measuring transducer for differentiating the feedback signal into a second feedback signal proportional to the acceleration of the dynamic speaker diaphragm. The active differentiating signal amplifier further has an output connected to an inverting (-) input of the differential power amplifier for driving the speaker in accordance with the input audio signal and the second feedback signal. The system may include multiple channels, each provided with its respective speaker, differential power amplifier, measuring transducer and active differentiating signal amplifier. The system may be a stereo system having two or more channels.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile