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:
Nov. 14, 2023
Filed:
Nov. 17, 2021
Shure Acquisition Holdings, Inc., Niles, IL (US);
Brent Robert Shumard, Mount Prospect, IL (US);
Thomas Andrew Satrom, Chicago, IL (US);
Shure Acquisition Holdings, Inc., Niles, IL (US);
Abstract
A filter that may increase and extend, the bass frequency response of a speaker of an audio device. The filter may be space-efficient. The filter may be part of a device that does not necessarily have a large rear cavity and that does not necessarily have porting and/or passive radiating. The low-frequency extension filter may be used, for example, with a smaller rear cavity while essentially simulating the acoustic effects of a much larger rear cavity. The low-frequency extension filter may include a plurality of acoustic pathways, such as tubes, which may wind around along a tortuous path and which may resemble a labyrinthine design. The tubes may be selected to resonate with particular predetermined low frequency channels. For example, the tubes may be approximately a quarter wavelength of the center of the corresponding frequency channel, or even slightly shorter.