Headphoning
First Claim
1. Headphone apparatus comprising,driver means for converting an input electrical signal into an acoustical output signal and having a vibratable diaphragm,housing means for supporting said driver means and having a cushion supporting bracket,cushion means for engagement with said cushion supporting bracket and formed with a centra1 opening defining a cavity accommodating said diaphragm for establishing a seal between said cushion supporting bracket and an outer ear to inhibit air flow between said cavity and the region outside said apparatus to significantly attenuate spectral components through the middle frequency range,and electroacoustical means separate from said driver means for transducing an acoustical pressure signal in said cavity to a corresponding transduced electrical signal,said electroacoustical transducing means being closely adjacent to said diaphragm and sufficiently close to the edge of said cavity away from said cushion support means so that said transducing means is responsive to the pressure in said cavity near the ear.
1 Assignment
0 Petitions
Accused Products
Abstract
Headphones have a small cavity between the diaphragm and the ear canal with a microphone in the cavity closely adjacent to the diaphragm providing a feedback signal that is combined with the input electrical signal to be reproduced by the headphones to provide a combined signal that is power amplified for driving the diaphragm.
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Citations
9 Claims
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1. Headphone apparatus comprising,
driver means for converting an input electrical signal into an acoustical output signal and having a vibratable diaphragm, housing means for supporting said driver means and having a cushion supporting bracket, cushion means for engagement with said cushion supporting bracket and formed with a centra1 opening defining a cavity accommodating said diaphragm for establishing a seal between said cushion supporting bracket and an outer ear to inhibit air flow between said cavity and the region outside said apparatus to significantly attenuate spectral components through the middle frequency range, and electroacoustical means separate from said driver means for transducing an acoustical pressure signal in said cavity to a corresponding transduced electrical signal, said electroacoustical transducing means being closely adjacent to said diaphragm and sufficiently close to the edge of said cavity away from said cushion support means so that said transducing means is responsive to the pressure in said cavity near the ear.
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5. Headphone apparatus comprising,
driver means for converting an input electrical signal into an acoustical output signal and having a vibratable diaphragm, housing means for supporting said driver means and having a cushion supporting bracket, cushion means for engagement with said cushion supporting bracket and formed with a central opening defining a cavity accommodating said diaphragm for establishing a seal between said cushion supporting bracket and an outer ear to inhibit air flow between said cavity and the region outside said apparatus to significantly attenuate spectral components through the middle frequency range, electroacoustical means for transducing an acoustical signal in said cavity to a corresponding transduced electrical signal, said electroacoustical transducing means being closely adjacent to said diaphragm and sufficiently close to the edge of said cavity away from said cushion support means so that said transducing means is responsive to the pressure in said cavity near the ear, power amplifying means for providing an amplified signal to said driver means, and means for inversely feeding back said transduced signal to said power amplifier means to produce in said cavity a signal component from said driver means tending to cancel the acoustical signal entering said cavity from outside said apparatus.
Specification