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:
Jan. 17, 1989
Filed:
Jul. 01, 1987
Johannes H Streng, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A device for converting an electric signal into an acoustic signal comprises an input terminal (1) for receiving an electric signal, an amplifier unit comprising N sub-amplifiers (13,15), and a transducer unit comprising N electrostatic transducers (2,3). The diaphragm (3,8) of the N electrostatic transducers forms part of a diaphragm which is common to all transducers. The input terminal (1) is coupled to the input (6) of the first transducer (2) via a first subamplifier (13). Further, the input terminal (1) is coupled to the input (11) of the (i+1)th transducer, i ranging from 1 to N-1 inclusive, via a series arrangement of an i-th low-pass filter (14) and an (i+1)th sub-amplifier (15) (in that order). The sub-amplifier is moreover of the feedback type. Further, for N>2 a low-pass filter having a higher sequence number i has a lower cut-off frequency.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile