High frequency compensating
First Claim
Patent Images
1. A feedback circuit for an active noise reduction headphone comprising:
- an acoustic block characterized by a first magnitude frequency response;
a compensator characterized by a second magnitude frequency response to combine the second magnitude frequency response with the first magnitude frequency response to provide a combined magnitude frequency response, wherein the second magnitude frequency response is characterized by a pattern that has a positive slope at a frequency interval in the spectral portion above 10 kHz.
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Abstract
A method and apparatus for increasing phase margin in a feedback circuit of an active noise reduction headphone. The method includes providing an acoustic block comprising an acoustic driver comprising a voice coil mechanically coupled along an attachment line to an acoustic energy radiating diaphragm, the acoustic block further comprising a microphone positioned along a line parallel to an intended direction of vibration of the acoustic diaphragm and intersecting the attachment line, the acoustic block characterized by a magnitude frequency response compensating the magnitude frequency response by a compensation pattern that has a positive slope over at least one spectral range above 10 kHz.
25 Citations
17 Claims
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1. A feedback circuit for an active noise reduction headphone comprising:
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an acoustic block characterized by a first magnitude frequency response;
a compensator characterized by a second magnitude frequency response to combine the second magnitude frequency response with the first magnitude frequency response to provide a combined magnitude frequency response, wherein the second magnitude frequency response is characterized by a pattern that has a positive slope at a frequency interval in the spectral portion above 10 kHz. - View Dependent Claims (2, 3, 4, 5, 7)
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6. A method comprising:
in an active noise reduction headphone characterized by a magnitude frequency response, compensating the magnitude frequency response by a pattern that has a positive slope between 20 KHz and 50 kHz.
- 8. A compensation pattern for an active noise reduction headphone characterized by a positive slope in the frequency range between 20 KHz and 50 kHz.
- 11. A compensation pattern for an active noise reduction headphone characterized by a positive slope above 10 kHz for a range of at least one octave.
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14. A method comprising:
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providing an active noise reduction headphone characterized by a magnitude frequency response; and
compensating the magnitude frequency response by a pattern that has a positive slope in at least a portion of the spectral range above 10 kHz for at least one octave. - View Dependent Claims (15, 16)
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17. A method for increasing phase margin in a feedback circuit of an active noise reduction headphone comprising:
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providing an acoustic block comprising an acoustic driver comprising a voice coil mechanically coupled along an attachment line to an acoustic energy radiating diaphragm, the acoustic block further comprising a microphone positioned along a line parallel to an intended direction of vibration of the acoustic diaphragm and intersecting the attachment line, the acoustic block characterized by a magnitude frequency response; and
compensating the magnitude frequency response by a compensation pattern that has a positive slope over at least one spectral range above 10 kHz.
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Specification
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Current AssigneeBose Corporation
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Original AssigneeBose Corporation
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InventorsSapiejewski, Roman
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current381/71.600
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CPC Class CodesG10K 11/17855 for improving speed or powe...G10K 11/17857 Geometric disposition, e.g....G10K 11/17875 using an error signal witho...G10K 11/17885 additionally using a desire...H04R 1/1083 Reduction of ambient noise ...H04R 3/00 Circuits for transducers , ...H04R 5/033 Headphones for stereophonic...
