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:
Sep. 02, 1980
Filed:
Feb. 08, 1979
Martin J Nagel, Russell Township, Geauga County, OH (US);
Tenna Corporation, Cleveland, OH (US);
Abstract
A loudspeaker with an overlay or bifilar wound split voice coil, a coil for driving a higher frequency speaker such as a tweeter, and a push-pull audio amplifier circuit directly coupled with the coils. The configuration of the split coil provides two coaxial voice coils that produce a transformer coupling at high frequencies. This coupling compensates for the normally experienced increased input impedance at high frequencies and results in a fairly constant input impedance over a large frequency range, facilitating uniform power transfer to the speaker. The high frequency voice coil is coupled across the split coaxial coils and is energized at high frequencies by a combined signal which includes the signal directly applied to one of the coaxial coils and the induced signal in the other coaxial coil.