High frequency compensating
DC
First Claim
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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 first pattern that has a positive slope at a frequency interval in the spectral portion above 10 kHz so that the phase shift of the combined magnitude frequency response of the feedback circuit at frequencies in the audible range of frequencies is less than the phase shift of the combined magnitude frequency response of the feedback circuit in the audible range of frequencies wherein the second magnitude frequency response characterized by a second pattern that does not have a positive slope 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.
26 Citations
23 Claims
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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 first pattern that has a positive slope at a frequency interval in the spectral portion above 10 kHz so that the phase shift of the combined magnitude frequency response of the feedback circuit at frequencies in the audible range of frequencies is less than the phase shift of the combined magnitude frequency response of the feedback circuit in the audible range of frequencies wherein the second magnitude frequency response characterized by a second pattern that does not have a positive slope in the spectral portion above 10 kHz. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- an acoustic block characterized by a first magnitude frequency response;
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8. A method comprising:
- in an active noise reduction headphone comprising a feedback loop characterized by a magnitude frequency response, compensating the magnitude frequency response by a first pattern that has a positive slope between 20 KHz and 50 kHz to provide a compensated magnitude frequency response so that the phase shift of the compensated magnitude frequency response at frequencies in the audible range of frequencies is less than the phase shift of the compensated magnitude frequency response in the audible range of frequencies wherein the compensating comprises compensating the magnitude frequency response by a second pattern that does not have a positive slope in the spectral portion above 10 kHz.
- View Dependent Claims (9, 10, 11)
- 12. A compensation pattern for an active noise reduction headphone comprising a feedback loop characterized by a magnitude frequency response, compensating the magnitude frequency response by a first pattern that has a positive slope in the frequency range between 20 KHz and 50 kHz to provide a compensated magnitude frequency response so that the phase shift of the compensated magnitude frequency response at frequencies in the audible range of frequencies is less than the phase shift of the compensated magnitude frequency response in the audible range of frequencies wherein the compensating comprises compensating the magnitude frequency response by a second pattern that does not have a positive slope in the spectral portion above 10 kHz.
- 15. A compensation pattern for an active noise reduction headphone comprising a feedback loop characterized by a magnitude frequency response compensating the magnitude frequency response by a first pattern that has a positive slope above 10 kHz for a range of at least one octave to provide a compensated magnitude frequency response, so that the phase shift of the compensated magnitude frequency response at frequencies in the audible range of frequencies is less than the phase shift of the compensated magnitude frequency response in the audible range of frequencies wherein the compensating comprises compensating the magnitude frequency response by a second pattern that does not have a positive slope in at least a portion of the spectral range above 10 kHz for at least one octave.
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18. A method comprising:
- providing an active noise reduction headphone comprising a feedback loop characterized by a magnitude frequency response; and
compensating the magnitude frequency response by a first pattern that has a positive slope in at least a portion of the spectral range above 10 kHz for at least one octave to provide a compensated magnitude frequency response, so that the phase shift of the compensated magnitude frequency response at frequencies in the audible range of frequencies is less than the phase shift of the compensated magnitude frequency response in the audible range of frequencies wherein the compensating comprises compensating the magnitude frequency response by a second pattern that does not have a positive slope in at least a portion of the spectral range above 10 kHz for at least one octave. - View Dependent Claims (19, 20)
- providing an active noise reduction headphone comprising a feedback loop characterized by a magnitude frequency response; and
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21. A method for increasing phase margin in a feedback circuit of an active noise reduction headphone comprising:
- 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 first compensation pattern that has a positive slope over at least one spectral range above 10 kHz so that the phase shift of the combined magnitude frequency response of the feedback circuit at frequencies in the audible range of frequencies is less than the phase shift of the combined magnitude frequency response of the feedback circuit in the audible range of frequencies wherein the second magnitude frequency response characterized by a second pattern that does not have a positive slope in the spectral portion above 10 kHz. - View Dependent Claims (22, 23)
- 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;
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Litigation Data
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Current AssigneeBose Corporation
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Original AssigneeBose Corporation
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InventorsSapiejewski, Roman
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Primary Examiner(s)Faulk; Devona
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Assistant Examiner(s)MONIKANG, GEORGE C
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Application NumberUS11/409,894Publication NumberTime in Patent Office2,024 DaysField of Search381/71.6, 381/93, 381/95, 381/96, 381/318, 381/97, 381/98, 330/109, 330/294US Class Current381/93CPC 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...
