Earpad comprising one or more resonators
An earpad comprising one or more acoustic resonators coupled to a contact face of the earpad that is configured to interface with a user's head, the acoustic resonators being configured to attenuate leakage of parasitic sound.
1 . An earpad, comprising:
one or more acoustic resonators coupled to a contact face of the earpad that is configured to interface with a user's head, the one or more acoustic resonators being configured to attenuate leakage of parasitic sound, wherein the one or more acoustic resonators are configured to attenuate propagation of parasitic sound based on at least one of a specific acoustic impedance (Z R ) of the one or more resonators and a surface porosity (Φ R ) due to the one or more resonators, and wherein
interfaces to the one or more acoustic resonators are located at the contact face of the earpad.
2 . The earpad of claim 1 , wherein:
the one or more resonators are one or more Helmholtz resonators, one or more Quarter Wavelength Resonators, one or more membrane resonators, or one or more active acoustic resonators.
3 . The earpad of claim 1 , wherein:
the one or more acoustic resonators are configured to attenuate the propagation of parasitic sound based on the specific acoustic impedance (Z R ) of the one or more resonators and the surface porosity (Φ R ) due to the one or more resonators.
4 . The earpad of claim 1 , wherein:
the one or more acoustic resonators are configured to attenuate the propagation of parasitic sound within a predefined target frequency band (F).
5 . The earpad of claim 4 , wherein:
the predefined target frequency band (F) is defined by the impedance (Z R ) of the one or more resonators, the surface porosity (Φ R ) due to the one or more resonators, and a resonance frequency (f R ) of the one or more resonators.
6 . The earpad of claim 5 , wherein:
a lower limit (f low ) of the frequency band (F) is based on the resonance frequency (f R ) of the one or more resonators.
7 . The earpad of claim 3 , wherein:
the surface porosity due to the one or more resonators (Φ R ) is 0.4.
8 . The earpad of claim 3 , wherein:
the specific acoustic impedance (Z R ) of the one or more resonators is frequency dependent.
9 . The earpad of claim 1 , wherein:
the one or more resonators are one or more Helmholtz resonators, each Helmholtz resonator among the one or more Helmholtz resonators comprising a mass channel and a compliance cavity.
10 . The earpad of claim 9 , wherein:
the compliance cavities of the one or more Helmholtz Resonators are combined into a joint compliance cavity connected to each of the mass channels of the one or more Helmholtz Resonators.
11 . The earpad of claim 10 , wherein:
the earpad comprises a plurality of sections, each of the sections comprising one joint compliance cavity and a plurality of mass channels connected to the one joint compliance cavity.
12 . The earpad of claim 11 , wherein:
the plurality of sections are separated from each other.
13 . The earpad of claim 1 , wherein;
the contact face of the earpad comprises the one or more acoustic resonators, and a contact face of the one or more acoustic resonators is a periodic plane having a lattice including a lattice constant, and the lattice constant in at least two directions is the same.
14 . The earpad of claim 1 , wherein:
the one or more acoustic resonators and a parasitic leak channel together form an absorbing acoustic meta material (AMM).
15 . An on-ear headphone or a circumaural headphone, comprising:
the earpad of claim 1 .
16 . A circumaural hearing protection, comprising:
the earpad of claim 1 .
17 . An earpad, comprising:
one or more acoustic resonators coupled to a contact face of the earpad that is configured to interface with a user's head, the one or more acoustic resonators being configured to attenuate leakage of parasitic sound, wherein
the one or more acoustic resonators are configured to attenuate propagation of parasitic sound within a predefined target frequency band (F),
the predefined target frequency band (F) is defined by impedance (Z R ) of the one or more resonators, a surface porosity (Φ R ) due to the one or more resonators, and a resonance frequency (f R ) of the one or more resonators, and
the earpad comprises a core material and a cover material, the cover material acting as the contact face of the earpad, wherein the cover material is perforated at areas of interfaces of the one or more resonators.
18 . The earpad of claim 17 , wherein:
the one or more acoustic resonators and a parasitic leak channel together form an absorbing acoustic meta material (AMM).
19 . An earpad, comprising:
one or more acoustic resonators coupled to a contact face of the earpad that is configured to interface with a user's head, the one or more acoustic resonators being configured to attenuate leakage of parasitic sound, wherein
the one or more resonators are one or more Helmholtz resonators, each Helmholtz resonator among the one or more Helmholtz resonators comprising a mass channel and a compliance cavity,
the compliance cavities of the one or more Helmholtz Resonators are combined into a joint compliance cavity connected to each of the mass channels of the one or more Helmholtz Resonators, and
the earpad comprises a plurality sections, each of the sections comprising one joint compliance cavity and a plurality of mass channels connected to the one joint compliance cavity.
20 . The earpad of claim 19 , wherein:
the one or more acoustic resonators and a parasitic leak channel together form an absorbing acoustic meta material (AMM).