Back to results
US 2015/0312671 A1Published application
Passive acoustical filters with filled expansion chamber
AssigneeDoppler Labs, Inc.
InventorsDan Wiggins, Jonathan Oswaks
Life of this patent
Estimating the term…
Abstract
A passive acoustical filter includes a first opening to receive ambient sound, a second opening to output filtered sound, and a first low pass filter element coupled between the first opening and the second opening. The first low pass filter element includes a first expansion chamber filled with a material in which a speed of sound is lower than a speed of sound in air.
Claims16
A passive acoustical filter, comprising:
- a first opening to receive ambient sound;
- a second opening to output filtered sound;
- a first low pass filter element coupled between the first opening and the second opening, the first low pass filter element comprising a first expansion chamber filled with a material in which a speed of sound is lower than a speed of sound in air.
A passive acoustical filter comprising:
- an earbud including a first opening to receive sound from an ambient and a second opening to output filtered sound to an ear of a listener;
- and
- a first-low-pass filter element contained within the earbud and coupled between the first opening and the second opening, the low-pass filter element comprising an expansion chamber filled with a material in which a speed of sound is lower than a speed of sound in air.
Dependencies are inferred from the claim text.