Audio device with acoustic valve
A hearing device such as a hearing aid, ear pod, headphone, or other wearable is provided, whose components include the following: an acoustic transducer with a vent port operable to produce sound, a housing of the acoustic transducer with a sound opening, and an actuatable acoustic valve disposed in the housing, where the acoustic valve is actuatable to alter passage of sound through the acoustic vent to change the state of the hearing device between an open vent state and a closed vent state, so that actuation of the valve changes an acoustic characteristic of the hearing device.
1. A hearing device comprising:
a rigid housing having a sound opening;
a sound-producing electroacoustic transducer disposed within the rigid housing, the transducer comprising a balanced armature receiver including a diaphragm separating an internal volume of the rigid housing into a back volume and a front volume, the front volume including a sound port;
a vent port acoustically coupled to the internal volume;
the front volume acoustically coupled to the sound opening of the rigid housing, a portion of the rigid housing configured to be disposed at least partially in a user's ear, wherein sound produced by the transducer emanates from the sound port of the front volume and through the sound opening of the rigid housing;
an acoustic valve disposed in the rigid housing and located externally to the transducer, the valve having a first port acoustically coupled to the internal volume via the vent port, and the valve acoustically coupled to ambient atmosphere to the internal volume,
the valve actuatable between an open state and a closed state, wherein actuation of the valve changes an acoustic characteristic of the hearing device.
2. The hearing device of claim 1 , wherein acoustic impedance between the internal volume and the volume external to the internal volume is greater when the valve is in the closed state than when the valve is in the open state.
3. The hearing device of claim 1 , wherein the actuation of the valve changes an acoustic output of the hearing device.
4. The hearing device of claim 1 , wherein the acoustic valve is acoustically coupled to the back volume via the vent port.
5. The hearing device of claim 4 having a nominal acoustic performance when the valve is in the closed state, the nominal acoustic performance including a first resonant frequency, wherein the hearing device has a new first resonant frequency when the valve is in the open state and wherein an acoustic output of the hearing device is increased at frequencies less than the new first resonant frequency when the valve is in the open state.
6. The hearing device of claim 1 further comprising a sound transmissive contamination barrier disposed between the volume external to the rigid housing and the valve.
7. The hearing device of claim 1 , the volume external to the internal volume is an effectively unbounded volume external to the rigid housing, wherein passage of sound between the transducer and the unbounded volume is attenuated more when the valve is in the closed state than when the valve is in the open state.
8. The hearing device of claim 1 , the volume external to the internal volume is an effectively unbounded volume external to the rigid housing, wherein passage of sound between the unbounded volume and the sound opening is relatively attenuated when the valve is in the closed state than when the valve is in the open state.
9. The hearing device of claim 1 , further comprising an acoustic damper disposed between the vent port of the acoustic transducer and the volume external to the internal volume.
10. A hearing device comprising:
a housing having a sound opening;
a sound-producing electroacoustic transducer disposed within the housing, the transducer comprising a balanced armature receiver including a diaphragm separating an internal volume of the housing into a back volume and a front volume, the front volume including a sound port;
a vent port acoustically coupled to the internal volume;
the front volume acoustically coupled to the sound opening of the housing, a portion of the housing configured to be disposed at least partially in a user's ear, wherein sound produced by the transducer emanates from the sound port of the front volume and through the sound opening of the housing;
an acoustic valve disposed in the housing, the valve having a first port acoustically coupled to the internal volume via the vent port, and the valve acoustically coupled to ambient atmosphere to the internal volume,
the valve actuatable between an open state and a closed state, wherein actuation of the valve changes an acoustic characteristic of the hearing device;
wherein the acoustic valve is acoustically coupled to the back volume via the vent port; and
having a nominal acoustic performance when the valve is in the closed state, the nominal acoustic performance including a first resonant frequency, wherein the hearing device has a new first resonant frequency when the valve is in the open state and wherein an acoustic output of the hearing device is increased at frequencies less than the new first resonant frequency when the valve is in the open state.
11. A hearing device comprising:
a housing having a sound opening;
a sound-producing electroacoustic transducer disposed within the housing, the transducer comprising a balanced armature receiver including a diaphragm separating an internal volume of the housing into a back volume and a front volume, the front volume including a sound port;
a vent port acoustically coupled to the internal volume;
the front volume acoustically coupled to the sound opening of the housing, a portion of the housing configured to be disposed at least partially in a user's ear, wherein sound produced by the transducer emanates from the sound port of the front volume and through the sound opening of the housing;
an acoustic valve disposed in the housing, the valve having a first port acoustically coupled to the internal volume via the vent port, and the valve acoustically coupled to ambient atmosphere to the internal volume,
the valve actuatable between an open state and a closed state, wherein actuation of the valve changes an acoustic characteristic of the hearing device;
the volume external to the internal volume is an effectively unbounded volume external to the housing, wherein passage of sound between the unbounded volume and the sound opening is relatively attenuated when the valve is in the closed state than when the valve is in the open state.