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. 26, 2006
Filed:
Sep. 08, 1999
Applicant:
David Cahill, Merrimac, MA (US);
Inventor:
David Cahill, Merrimac, MA (US);
Assignee:
Boston Acoustics, Inc., Peabody, MA (US);
Primary Examiner:
Int. Cl.
CPC ...
H03G 11/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A thermal overload and resonant motion control circuit is provided for an audio speaker, the circuit generating a feedback signal to control the input applied to the speaker, which feedback signal is dependent on both the drive current to the speaker and the speaker impedance. More specifically, the feedback signal has a voltage which is substantially equally to the absolute value of K(bv−ai)H(s); where,