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:
Aug. 09, 2016
Filed:
Nov. 27, 2014
Blackberry Limited, Waterloo, CA;
Andre John Van Schyndel, Kanata, CA;
James David Gordy, Ottawa, CA;
Brady Nicholas Laska, Arnprior, CA;
BLACKBERRY LIMITED, Waterloo, Ontario, CA;
Abstract
A method, system and apparatus for loudspeaker excursion domain processing are provided. At a device comprising: a processor, a loudspeaker comprising a voice coil, one or more devices for determining loudspeaker voltage and current as a function of time, t, and a memory storing a Bl product for the loudspeaker, loudspeaker currents I(t) and corresponding voltages V(t) are received at the processor from the one or more devices. A current-from-voltage transfer function H(ω) is derived from the loudspeaker currents I(t) and voltages V(t), as a function of frequency, ω. A Fourier space excursion-from-voltage transfer function H(ω) is determined, whose form is constrained by parameters H(ω), Bl, R, and L, where: Rcomprises a resistance of the voice coil; and Lcomprises an inductance of the voice coil. Filter coefficients are determined using H(ω), which are used in a filter applied to an input signal for the loudspeaker.