Ambient noise isolation audio headphones having a layered dampening structure
View Patent ↗An audio headphone apparatus having ambient noise isolation properties for musicians and sound engineers which allows a user to substantially attenuate ambient noise levels and focus on the electronic audio presented to the headphones. The apparatus utilizes a unique layering of absorber materials with unique geometric shapes which in combination highly attenuate external ambient acoustic energy and control undesirable “boomy” bass response. The apparatus further utilizes a desiccant material within the ear cuff cover which helps to absorb perspiration or other moisture.
1. An ambient noise isolation audio headphone comprising:
one or more earpieces, each having an ear cup; and
said ear cup having an outer wall, a sealed cavity, and a circumference; and
a liner adjacent to said outer wall within said cavity and said liner having a first thickness and acting as a first layer ambient noise protection absorber; and
a first absorber of a flexible polyurethane open cell foam having a second thickness and having approximately a contour size of said circumference and placed over said liner within said cavity; and
a second absorber having a third thickness less than said second thickness and of a substantially smaller size than said circumference and centered and placed over said first absorber; and
a bass absorber placed over said second absorber and having a fourth thickness and an elliptical strip form of approximately said ear cup circumference and a star shaped center connected with said elliptical strip form and having openings between said star shaped center and said elliptical strip whereby a higher frequency audio energy having a wavelength of approximately half or less than a dimension of said opening may pass through said bass absorber with minimal attenuation and attenuate a bass resonance frequency audio; and
an air gap between said first absorber and said bass absorber due to said second absorber having said smaller size than said circumference wherein an acoustic impedance difference between said first absorber, said second absorber, and said bass absorber is maximized and a substantial sound reflection is achieved; and
a non-vented an-isotropic magnet driven speaker having a sound exiting portion and a speaker rearside having a speaker cap, said speaker rearside positioned to face said cavity; and
said star shaped center positioned directly behind said speaker rearside and contacting said speaker cap; and
said openings of said bass absorber allowing one or more outer non-center portions of said speaker to vibrate at said openings; and
an ear cuff having a backside, a cuff frame, a cuff pad, a cuff pad cover, an ear cavity, and a frontside; and
said ear cuff backside mated with said ear cup wherein said sound exiting portion of said speaker may transmit through said ear cavity; and
a speaker cover of a cloth material placed between said sound exiting portion and said ear cuff whereby said first absorber, said second absorber, said bass absorber, said speaker, and said liner are held together.
2. The ambient noise isolation audio headphone of claim 1 whereby:
said liner is of a material having a different acoustic impedance than said first absorbers.
3. The ambient noise isolation audio headphone of claim 1 further comprising:
a desiccant board within said cuff pad cover; and
said cuff pad cover of a permeable material whereby moisture permeating through said cover is absorbed by said desiccant via a wick effect.
4. The ambient noise isolation audio headphone of claim 3 whereby:
said desiccant board within said cuff pad cover is between said cuff pad and said cuff frame.
5. The ambient noise isolation audio headphone of claim 2 further comprising:
a desiccant within said cuff pad cover; and
said cuff pad cover of a permeable material whereby moisture permeating through said cover is absorbed by said desiccant via a wick effect.
6. The ambient noise isolation audio headphone of claim 5 whereby:
said desiccant board within said cuff pad cover is between said cuff pad and said cuff frame.
7. The ambient noise isolation audio headphone of claim 6 whereby:
said liner is of a felt material and said first thickness is approximately one sixteenth inch; and
said first absorber second thickness is approximately one half inch; and
said second absorber third thickness is approximately one eighth inch; and
said bass absorber fourth thickness is approximately one eighth inch open cell foam material.