ACTIVE NOISE CONTROL WITH COMPENSATION FOR ACOUSTIC LEAK IN PERSONAL LISTENING DEVICES
First Claim
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1. A method for in-the-field use of a personal listening audio device, comprising:
- performing an acoustic noise cancellation (ANC) process during in-the-field use of a personal listening audio device using a control filter to produce anti-noise by the device, wherein the process includes computing an S_hat filter that estimates a signal path between an earpiece speaker of the device and an error microphone that are at a user'"'"'s ear;
comparing a response associated with the computed S_hat filter to a predetermined response that is stored in the device; and
adjusting the control filter of the ANC process in accordance with the comparison.
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Abstract
An acoustic noise cancellation (ANC) process is performed during in-the-field use of a personal listening audio device, using a control filter to produce anti-noise by the device. The process includes computing an S_hat filter that estimates a signal path between an earpiece speaker of the device and an error microphone that are at a user'"'"'s ear. A response associated with the computed S_hat filter is compared to a predetermined response that is stored in the device. The control filter is adjusted in accordance with the comparison. Other embodiments are also described and claimed.
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Citations
23 Claims
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1. A method for in-the-field use of a personal listening audio device, comprising:
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performing an acoustic noise cancellation (ANC) process during in-the-field use of a personal listening audio device using a control filter to produce anti-noise by the device, wherein the process includes computing an S_hat filter that estimates a signal path between an earpiece speaker of the device and an error microphone that are at a user'"'"'s ear; comparing a response associated with the computed S_hat filter to a predetermined response that is stored in the device; and adjusting the control filter of the ANC process in accordance with the comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for in-the-field use of a personal listening audio device, comprising:
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performing an acoustic noise cancellation (ANC) process during in-the-field use of a personal listening audio device using a first control filter and a second filter control whose outputs are combined to produce anti-noise by the device, wherein the process includes computing an S_hat filter that estimates a signal path between an earpiece speaker of the device and an error microphone that are at a user'"'"'s ear, and performing an adaptive control process that adapts the first control filter based on signals derived from a reference microphone and the error microphone; performing an automatic gain control process (AGC) that computes strength of a signal derived from the error microphone, compares the computed strength to a target strength, and based on the comparison selects one of a plurality of previously determined filter specifications; and configuring the second control filter of the ANC process in accordance with the selected filter specification. - View Dependent Claims (14, 15, 16)
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17. An acoustic noise cancellation (ANC) audio device comprising:
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a speaker housing to be held against or inside a user'"'"'s ear, the housing having integrated therein an error microphone and a speaker driver system, wherein the speaker driver system is to covert an audio signal and an anti-noise signal into sound and wherein there is acoustic leakage past the speaker housing and into the user'"'"'s ear canal; a programmable digital filter to produce the anti-noise signal; an adaptive control system having an input coupled to an output of the error microphone and a further input coupled to the audio signal, the adaptive control system to compute an S_hat filter representing a signal path that is from an input of the speaker driver system to an output of the error microphone; and a controller to use information in the S_hat filter to estimate size of the acoustic leakage and in response adjust the programmable digital filter to compensate for the leakage. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification