Audio reproduction system
First Claim
1. A self-equalizing audio headset system, said system comprisinginput means for receiving a desired signal,sensor means adapted to provide a sensing signal related to the sound at the listener'"'"'s ear,equalization filter means adapted to respond to said desired signal and produce a modified signal,acoustic actuator means adapted to respond to a drive signal derived from said modified signal,weighting filter means adapted to provide a model of the response of said sensor means, and delay means,said system characterized in that said equalization filter means is continuously adapted to maintain said sensing signal close to a desired sensor signal obtained by passing said desired signal through said weighting filter means and said delay means, said desired sensor signal thereby corresponding to a delayed and filtered version of said desired signal enabling the system to produce the desired sound at the listener'"'"'s ear.
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Accused Products
Abstract
An improved audio system designed to maintain a desired sound at the ear of a listener by using an equalization filter (2). The equalization filter (2) is continuously adjusted in response to the signal (9) from a sensor (8) which monitors the sound close to the listener'"'"'s ear. The audio system can be combined with an active noise control system (3) to reduce interference from external noise.
179 Citations
20 Claims
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1. A self-equalizing audio headset system, said system comprising
input means for receiving a desired signal, sensor means adapted to provide a sensing signal related to the sound at the listener'"'"'s ear, equalization filter means adapted to respond to said desired signal and produce a modified signal, acoustic actuator means adapted to respond to a drive signal derived from said modified signal, weighting filter means adapted to provide a model of the response of said sensor means, and delay means, said system characterized in that said equalization filter means is continuously adapted to maintain said sensing signal close to a desired sensor signal obtained by passing said desired signal through said weighting filter means and said delay means, said desired sensor signal thereby corresponding to a delayed and filtered version of said desired signal enabling the system to produce the desired sound at the listener'"'"'s ear.
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10. An active noise reducing headset or communications ear-piece system, said system comprising
input means adapted to receive a desired signal, sensor means adapted to provide a sensor signal related to the sound a a listener'"'"'s ear, equalization filter means responsive to said desired signal and adapted to produce a first signal, signal generator means adapted to produce a cancellation signal, acoustic actuator means responsive to a signal derived from a combination of said first signal and said cancellation signal, characterized in that said signal generator means is continuously adjusted in response to said desired signal and said sensor signal.
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12. An active noise reducing headset or communications ear-piece system, said system comprising
sensor means adapted to provide a sensing signal related to the sound at the listener'"'"'s ear, input means adapted to receive a desired signal, control filter means adapted to produce a cancellation signal responsive to a signal derived from said sensing signal, equalization filter means responsive to a combination of the cancellation signal and desired signal and adapted to produce a modified signal, means to process said desired signal to produce a desired equalization signal representing a desired equalization of said sensing signal, and acoustic actuator means responsive to a signal derived from said modified signal.
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16. A combined equalization and active noise control system comprising
input means for receiving a desired input signal, sensor means adapted to provide a sensing signal related to the sound adjacent a listener'"'"'s ear, equalization filter means adapted to produce a modified signal, acoustic actuator means placed adjacent to said sensor means and adapted to respond to a drive signal derived from said modified signal, and active noise control means for reducing external noise entering the ear, said system being characterized in that the active noise control means has an output which is combined with said desired signal to produce the signal inputted to said equalization filter means, said system characterized in that said equalization filter means is adjusted continuously to maintain said sensing signal close to a desired sensor signal derived from said desired input signal.
Specification