Near to the ear subwoofer
View Patent ↗A loudspeaker arrangement for a seat within a motor vehicle utilizes one or more localized sound output ports for low frequency sound reproduction. A housing, such as an enclosure, substantially surrounds a loudspeaker. One or more audio transmission line channels acoustically interconnect the interior of the enclosure to one or more sound output ports. The enclosure is situated below, behind, or in some fixed location around or within a vehicle seat. The sound outputs ports are situated at or near a headrest such that the output ports are located substantially less than a wavelength of sound at the highest operating frequency from either ear of the seat's occupant. The acoustic response and resonances of a 1) rear enclosure, 2) a front vented enclosure, 3) a loudspeaker, and 4) an audio transmission path from the enclosure to one or more output ports are used to provide localized low frequency sound reproduction.
1. A loudspeaker comprising:
a seat including one or more sound output ports for sound reproduction;
one or more loudspeakers at least six inches away from the one or more sound output ports;
an enclosure substantially surrounding the loudspeaker(s) such that sound from the loudspeaker(s) is emitted into an interior of the enclosure; and
one or more audio transmission channels each extending out of the enclosure and through the seat, and acoustically interconnecting the interior of the enclosure to the one or more sound output ports.
2. The arrangement of claim 1 , wherein the arrangement utilizes multiple loudspeakers in a discrete stereo or mono configuration.
3. The arrangement of claim 1 , wherein the arrangement utilizes multiple loudspeakers in coherent or non-coherent summation alignments such as isobaric or push-pull configurations.
4. The arrangement of claim 1 , wherein the audio transmission channels comprise substantially hollow conduits.
5. The arrangement of claim 1 , wherein the audio transmission channels comprise partially occluded conduits with damping material.
6. The arrangement of claim 1 , wherein the enclosure is substantially soundproof.
7. A method for providing cross-seat audio cancellation, utilizing the arrangement of claim 1 , including cancelling discrete audio playing in adjacent seats, the cancelling including digital signal processing (DSP).
8. A loudspeaker arrangement for a motor vehicle having a frame, the arrangement comprising:
a seat including at least one sound output, the seat being configured to support a human passenger of the motor vehicle;
a loudspeaker component;
a housing substantially surrounding the loudspeaker component in conjunction with the frame of the motor vehicle such that sound from the loudspeaker component is emitted into the frame; and
at least one audio transmission line vent disposed in the seat, each said audio transmission line vent being configured to carry sound emitted by the loudspeaker component to a respective said sound output.
9. The arrangement of claim 8 , wherein the seat includes a top end and a headrest attached to the top end, the sound output being disposed on the top end.
10. The arrangement of claim 8 , wherein the sound output is positioned to be less than six inches from an ear of the passenger.
11. The arrangement of claim 8 , wherein the at least one audio transmission line vent comprises a substantially hollow conduit.
12. The arrangement of claim 8 , wherein the audio transmission line vent is substantially soundproof except at the sound output.
13. The arrangement of claim 8 , wherein the at least one sound output comprises two sound outputs, the sound outputs being at least twelve inches apart.
14. The arrangement of claim 8 , wherein at least one of the housing and the loudspeaker is configured to be attached to the frame of the motor vehicle.
15. A loudspeaker arrangement for a motor vehicle, the arrangement comprising:
a seat including at least one sound output port;
a loudspeaker component disposed at least six inches away from the at least one sound output port;
a housing substantially surrounding the loudspeaker component such that sound from the loudspeaker component is emitted into an interior of the housing, the housing including a transmission line vent providing an air pathway between an interior of the housing and ambient air; and
at least one audio transmission channel extending out of the housing and through the seat, and acoustically interconnecting the interior of the housing to a respective said sound output port.
16. The arrangement of claim 15 , wherein the arrangement includes multiple loudspeakers in a discrete stereo or mono configuration.
17. The arrangement of claim 15 , wherein the arrangement includes multiple loudspeakers in coherent or non-coherent summation alignments such as isobaric or push-pull configurations.
18. The arrangement of claim 15 , wherein the audio transmission channel comprises a substantially hollow conduit.
19. The arrangement of claim 15 , wherein the audio transmission channel comprises a partially occluded conduit with damping material.
20. The arrangement of claim 15 , wherein the housing includes two enclosures and a transmission line vent providing an air pathway fluidly interconnecting the two enclosures to achieve double tuning.