Prosecution Insights
Last updated: October 02, 2026
Application No. 18/400,971

ACTIVE NOISE REDUCTION HEADPHONES AND METHOD

Final Rejection §102§103§112
Filed
Dec 29, 2023
Priority
Jun 30, 2021 — continuation of PCTEP2021068023
Examiner
SAUNDERS JR, JOSEPH
Art Unit
2600
Tech Center
2600 — Communications
Assignee
Huawei Technologies Co., Ltd.
OA Round
2 (Final)
73%
Grant Probability
Favorable
3-4
OA Rounds
0m
Est. Remaining
94%
With Interview

Examiner Intelligence

Grants 73% — above average
73%
Career Allowance Rate
562 granted / 767 resolved
+11.3% vs TC avg
Strong +21% interview lift
Without
With
+20.6%
Interview Lift
resolved cases with interview
Typical timeline
2y 10m
Avg Prosecution
24 currently pending
Career history
787
Total Applications
across all art units

Statute-Specific Performance

§101
5.8%
-34.2% vs TC avg
§103
42.8%
+2.8% vs TC avg
§102
27.0%
-13.0% vs TC avg
§112
14.5%
-25.5% vs TC avg
Black line = Tech Center average estimate • Based on career data from 767 resolved cases

Office Action

§102 §103 §112
DETAILED ACTION Notice of Pre-AIA or AIA Status The present application, filed on or after March 16, 2013, is being examined under the first inventor to file provisions of the AIA . This Office action is based on the communications filed November 14, 2025. Claims 1 – 4 and 6 – 20 are currently pending and considered below. Response to Arguments Applicant's arguments filed November 14, 2025 have been fully considered but they are not persuasive. Applicant argues on page 15 of the Remarks that “Hua also describes that the signals from the accelerometer 706 and internal microphone 610 are combined, e.g., into a single signal, before being operated upon by the feedback filter 804 in the feedback path. See Hua, paragraph [0035]. As such, Hua describes a system where the signal of the accelerometer 706 and internal microphone 610 are combined into a single signal before being provided to the FB filter 804. Hua fails to describe applying an acceleration feedforward (FF) filter to the acceleration signal (only) to generate the acceleration compensation signal as required by amended claim 1. Instead, Hua describes using a different filter that is applied to a combined signal for compensating wind noise and occlusion mitigation. It is respectfully submitted that Hua fails to disclose or suggest the amended features of claim 1 for at least these reasons.” The Examiner respectfully disagrees. When referencing the “single signal” “being operated upon by the feedback filter 804 in the feedback path” Applicant is referencing signal “e” in feedback path. However, Hua also discloses applying filter 804 to acceleration signal “only” in the feedforward path cited as “(Hua, Fig.8, Filter 804 applied to signal from Accelerometer 706.)”. Therefore, Hua meets the claimed limitation. Claim Rejections - 35 USC § 112 Claims 18 – 20 are rejected under 35 U.S.C. 112(b) or 35 U.S.C. 112 (pre-AIA ), second paragraph, as being indefinite for failing to particularly point out and distinctly claim the subject matter which the inventor or a joint inventor (or for applications subject to pre-AIA 35 U.S.C. 112, the applicant), regards as the invention. Claim 18 recites “wherein the fixed or adaptive ambient noise feedforward filter is updated in real-time” however it is unclear as to what is meant by a fixed filter being updated in real time. Claims 19 and 20 are rejected due to dependency. Appropriate correction and/or clarification is required. Claim Rejections - 35 USC § 102 In the event the determination of the status of the application as subject to AIA 35 U.S.C. 102 and 103 (or as subject to pre-AIA 35 U.S.C. 102 and 103) is incorrect, any correction of the statutory basis (i.e., changing from AIA to pre-AIA ) for the rejection will not be considered a new ground of rejection if the prior art relied upon, and the rationale supporting the rejection, would be the same under either status. The following is a quotation of the appropriate paragraphs of 35 U.S.C. 102 that form the basis for the rejections under this section made in this Office action: A person shall be entitled to a patent unless – (a)(1) the claimed invention was patented, described in a printed publication, or in public use, on sale, or otherwise available to the public before the effective filing date of the claimed invention. (a)(2) the claimed invention was described in a patent issued under section 151, or in an application for patent published or deemed published under section 122(b), in which the patent or application, as the case may be, names another inventor and was effectively filed before the effective filing date of the claimed invention. Claim(s) 1 – 4, 15, 16, 18, and 19 is/are rejected under 35 U.S.C. 102(a)(1) and 102(a)(2) as being anticipated by Hua (U.S Patent Application Publication No. 2020/0020313 A1). Regarding claim 1, Hua teaches: Active noise reduction (ANR) headphones for generating a sound signal (Hua, Par 0001: " audio processing for headphones. See also Hua, Par 0025: " the feedback ANC...") the ANR headphones comprising: a loudspeaker configured to be driven by a loudspeaker signal for generating the sound signal (Hua, Figs.6-8, Driver 608 driven by Summer 606); an external microphone configured to detect an ambient noise signal (Hua, Fig.8, External Microphone 602); an internal microphone configured to detect a residual noise signal (Hua, Fig.8, Internal Microphone 610); an acceleration sensor configured to generate an acceleration signal indicative of one or more accelerations experienced by the ANR headphones (Hua, Fig.8, Accelerometer 706); and a controller configured to generate the loudspeaker signal (Hua, Par 0044: " .digital audio processing described above can be implemented with one or more processors...") based on a composite compensation signal (Hua, Fig.8, Summer 606 creates composite signal from multiple input signals.), wherein the composite compensation signal is a combination of an ambient noise compensation signal based on the ambient noise signal (Hua, Fig.8, Signal from Ext Microphone 602 to Summer 606), a residual noise compensation signal based on the residual noise signal (Hua, Fig.8, Signal from Internal Microphone 610 to Summer 606), and an acceleration compensation signal based on the acceleration signal (Hua, Fig.8, Signal from Accelerometer 706 to Summer 606), and wherein the controller is configured to generate the acceleration compensation signal based on the acceleration signal by applying an acceleration feedforward (FF) filter to the acceleration signal (Hua, Fig.8, Filter 804 applied to signal from Accelerometer 706.). Regarding claim 2, Hua teaches: The ANR headphones of claim 1, wherein the controller is configured to generate the loudspeaker signal based on the composite compensation signal and an audio input signal (Hua, Par 0002: "Headphones...are in popular use for listening to music, speech during a mobile phone call, or other audio the user is acoustically cut off from the surrounding environment"; Par 0003 "Various versions of an audio processing system having headphones are presented herein an audio processor is configured for a transparency effect, and for occlusion effect mitigation." Hua's headphones, being used for audio signals such as music, are here having the audio inputs combined with audio processing for implementation of acoustic transparency and mitigation of occlusion effects, which are associated with the transmission of those same audio signals through the headphones.). Regarding claim 3, Hua teaches: The ANR headphones of claim 1, wherein the controller is configured to generate the ambient noise compensation signal based on the ambient noise signal by applying a fixed or adaptive ambient noise feedforward filter to the ambient noise signal (Hua, Fig.8, Filter 802 applied to signal from External Microphone 602). Regarding claim 4, and in light of the 112(b) rejection indicated above, Hua teaches: The ANR headphones of claim 1, wherein the controller is configured to generate the residual noise compensation signal based on the residual noise signal by applying a fixed or adaptive feedback filter to the ambient noise signal (Hua, Fig.8, Filter 804 applied to signal from Internal Microphone 610). Regarding claim 15, Hua teaches: A method for operating active noise reduction (ANR) headphones for generating a sound signal, (Hua, Par 0001: " audio processing for headphones. See also Hua, Par 0025: " the feedback ANC...") the method comprising: driving a loudspeaker by a loudspeaker signal for generating the sound signal (Hua, Figs.6-8, Driver 608 driven by Summer 606); detecting an ambient noise signal by an external microphone (Hua, Fig.8, External Microphone 602); detecting a residual noise signal by an internal microphone (Hua, Fig.8, Internal Microphone 610); generating by an acceleration sensor an acceleration signal indicative of one or more accelerations experienced by the ANR headphones (Hua, Fig.8, Accelerometer 706); and generating the loudspeaker signal based on a composite compensation signal (Hua, Fig.8, Summer 606 creates composite signal from multiple input signals.), wherein the composite compensation signal is a combination of an ambient noise compensation signal based on the ambient noise signal (Hua, Fig.8, Signal from Ext Microphone 602 to Summer 606), a residual noise compensation signal based on the residual noise signal (Hua, Fig.8, Signal from Internal Microphone 610 to Summer 606), and an acceleration compensation signal based on the acceleration signal (Hua, Fig.8, Signal from Accelerometer 706 to Summer 606), and wherein the controller is configured to generate the acceleration compensation signal based on the acceleration signal by applying an acceleration feedforward (FF) filter to the acceleration signal (Hua, Fig.8, Filter 804 applied to signal from Accelerometer 706.). Regarding claim 16, Hua teaches: A tangible, non-transitory computer-readable storage medium having instructions thereon which, upon being executed by one or more processors, alone or in combination, provide for execution of a method for operating active noise reduction (ANR) headphones for generating a sound signal, the method substantially similar in scope to claim 15 and therefore is rejected for the same reasons (Hua, Par 0044: " digital audio processing described above can be implemented with one or more processors. a digital signal processor that is executing the appropriate software (instructions) that is stored in memory."). Regarding claim 18, Hua teaches: The ANR headphones of claim 3, wherein the fixed or adaptive ambient noise feedforward filter is updated in real-time in based on the ambient noise signal and the residual noise signal (Hua, Par 0037: “FIG. 9 is a system diagram of a headphone with a transparency feature that uses an external microphone 602 in a feedforward path with a feedforward filter 902… Here, both filters 902, 904 are controlled by a filter coefficient controller 906 that detects wind by analyzing one or more, e.g., all, of the signals from the external microphone 602, the accelerometer 706, and an internal microphone 610… Various versions of this system may combine features from the example shown in FIGS. 7 and 8, with added adjustability and controllability for the feedforward filter 902 and the feedback filter 904,” Hua, Par 0041: “With the filters 902, 904 tuned by the filter coefficient controller 906, the driver 608 produces sound in the aural canal 104 that has transparency (external sound is reproduced) with reduced wind noise, e.g., relative to the wind noise that is picked up by the external microphone 602, and also has occlusion effect mitigation”). Regarding claim 19, Hua teaches: The ANR headphones of claim 18, wherein the ambient noise signal is filtered through a path which is an approximation of an acoustic transfer path between the loudspeaker and the internal microphone (Hua, Par 0027: “To overcome the effects of sound modification that are due to obstructions, an external facing microphone, here an external microphone 202, is used to pick up ambient sound from outside of the aural canal 104 and outside of the headphone 206 (that is also referred to here as external sound.) Audio processing through a filter, which may include amplification, is applied to the signal from the external microphone 202 to produce a signal for driving the speaker 204. Sound pressure in the aural canal 104, as modified by the obstruction and by the audio processing and the output of the speaker 24 is denoted p'(t). The filter is designed so that p'(t) approximates p(t). The filter is tuned to take into account and offset or compensate for sound loss that is due to the obstruction, at various frequencies”, Hua, Par 0041: “With the filters 902, 904 tuned by the filter coefficient controller 906, the driver 608 produces sound in the aural canal 104 that has transparency (external sound is reproduced) with reduced wind noise, e.g., relative to the wind noise that is picked up by the external microphone 602, and also has occlusion effect mitigation”). Claim Rejections - 35 USC § 103 The following is a quotation of 35 U.S.C. 103 which forms the basis for all obviousness rejections set forth in this Office action: A patent for a claimed invention may not be obtained, notwithstanding that the claimed invention is not identically disclosed as set forth in section 102, if the differences between the claimed invention and the prior art are such that the claimed invention as a whole would have been obvious before the effective filing date of the claimed invention to a person having ordinary skill in the art to which the claimed invention pertains. Patentability shall not be negated by the manner in which the invention was made. Claim(s) 6 – 8 and 11 is/are rejected under 35 U.S.C. 103 as being unpatentable over Hua (U.S. Patent Application No. 2020/0020313 A1) in view of Fabry (U.S. Patent Application Publication No. 2023/0328462 A1). Regarding claim 6, Hua teaches: 'The ANR headphones of claim 1. Hua is not relied upon herein to teach: wherein the acceleration FF filter is a fixed acceleration FF filter comprising a plurality of fixed filter coefficients and wherein the plurality of fixed filter coefficients of the fixed acceleration FF filter are based on a solution of the Wiener-Hopf equation. Fabry teaches: wherein the acceleration FF filter is a fixed acceleration FF filter (Fabry, Par 0062: "The filter can be implemented as a time-invariant filter that is calculated once, uploaded to the headphone firmware and used in this form without any changes being made at runtime.") comprising a plurality of fixed filter coefficients (Fabry, Par 0062: " the filter coefficients... ") and wherein the plurality of fixed filter coefficients of the fixed acceleration FF filter are based on a solution of the Wiener-Hopf equation (Fabry, Par 0057: "The forward filter W(z) can be obtained, for example, by solving the Wiener-Hopf equation "; Note that filter coefficients can be obtained through a variety of mathematical equations, including the mathematical equation. It would have been obvious to a person of ordinary skill in the art before the effective filing date of the claimed invention to have used the teaching of 'wherein the acceleration FF filter is a fixed acceleration FF filter comprising a plurality of fixed filter coefficients and wherein the plurality of fixed filter coefficients of the fixed acceleration FF filter are based on a solution of the Wiener-Hopf equation' in Hua's invention as taught by Fabry's invention. The motivation for doing this would be for the ability to select or design applicable filters (Fabry, Par 0056: " select or design a filter which can be applied..."). Regarding claim 7, Hua in view of Fabry teaches: The ANR headphones of claim 6. Fabry teaches: wherein the plurality of fixed filter coefficients WACC of the fixed acceleration FF filter (Fabry, Par 0062: "The filter can be implemented as a time-invariant filter...") are based on the following equation: W A C C = ψ g g - 1 ϕ h g   wherein ψ g g denotes an auto-correlation matrix for an impulse response of the communication channel between the loudspeaker and the internal microphone and ϕ h g denotes a cross-correlation vector between an impulse response and the impulse response of the communication channel between the acceleration sensor and the internal microphone. (Fabry, Par 0062: "The filter can be calculated See also Fabry, Par 0057: "The forward filter W(z) can be obtained, for example, by solving the Wiener-Hopf equation …"; Note that filter coefficients can be obtained through a variety of mathematical equations, including the mathematical equation W A C C = ψ g g - 1 ϕ h g . Regarding claim 8, Hua in view of Fabry teaches: The ANR headphones of claim 6. Fabry teaches: further comprising a memory configured to store the plurality of fixed filter coefficients WACC of the fixed acceleration FF filter (Fabry, Par 0062: " the filter coefficients of the digital filter 32 can be adjusted by the digital signal processor. The filter can be implemented as a time-invariant filter that is calculated once, uploaded to the headphone firmware..."). Regarding claim 11, Hua teaches: The ANR headphones of claim 5. Hua is not relied upon herein to teach: wherein the acceleration feedforward filter is an adaptive filter comprising a plurality of adaptive filter coefficients. Fabry teaches: wherein the acceleration feedforward filter is an adaptive filter (Fabry, Par 0062: "An adaptive filter, which changes at runtime and adapts to the current circumstances, can also be used.") comprising a plurality of adaptive filter coefficients (Fabry, Par 0062" the filter coefficients.. "). It would have been obvious to a person of ordinary skill in the art before the effective filing date of the claimed invention to have used the teaching of 'wherein the acceleration feedforward filter is an adaptive filter comprising a plurality of adaptive filter coefficients' in Hua's invention as taught by Fabry's invention. The motivation for doing this would be for the ability to select or design applicable filters (Fabry, Par 0056: " select or design a filter which can be applied..."). Claims 9 and 10 are rejected under 35 U.S.C. 103 as being unpatentable over Hua (U.S. Patent Application No. 2020/0020313 A1) in view of Fabry (U.S. Patent Application Publication No. 2023/0328462 A1) in further view of Pan (U.S. Patent Application Publication No. 2013/0156213 A1). Regarding claim 9, Hua in view of Fabry teaches: The ANR headphones of claim 7. Hua is not relied upon herein to teach: wherein the impulse response of the communication channel between the acceleration sensor and the internal microphone is based on measurements of the residual noise signal in response to one or more pre-determined accelerations of the ANR headphones. Pan teaches: wherein the impulse response of the communication channel between the acceleration sensor and the internal microphone is based on measurements of the residual noise signal in response to one or more pre-determined accelerations of the ANR headphones (Pan, Par 0019: "The sensor may be either a microphone or an accelerometer."; Pan, Par 0021: "Transfer functions from each sound transducer to the sensor location are measured and stored, and transfer functions from each sound transducer to the evaluation location are measured and stored."; See also Pan, Par 0041: "Determining transfer functions from loudspeakers to sensors and/or to the ear(s) of a listener (i.e., the evaluation locations) is known in the art. For example, a filter can be synthesized that has a transfer function that matches the measured transfer function from one source to one position. A filter is then synthesized that has the same impulse response as the measured transfer function..."). It would have been obvious to a person of ordinary skill in the art before the effective filing date of the claimed invention to have used the teaching of 'wherein the impulse response of the communication channel between the acceleration sensor and the internal microphone is based on measurements of the residual noise signal in response to one or more pre-determined accelerations of the ANR headphones' in Hua's modified invention as taught by Pan's invention. The motivation for doing this would be for the ability to produce applicable filters between a variety of sound sources, such as speakers and accelerometer detected vibrations, versus a variety of sound sinks, such as microphones, acoustic sensors and accelerometers, and with each placed at different locations used for evaluation (Pan, Par 0041: "Such filters can be synthesized for each loudspeaker to each sensor and each evaluation location."). Regarding claim 10, Hua in view of Fabry teaches: The ANR headphones of claim 7. Hua is not relied upon herein to teach: wherein the impulse response of the communication channel between the acceleration sensor and the internal microphone is based on measurements of the residual noise signal in response to one or more measured accelerations of the ANR headphones. Pan teaches: wherein the impulse response of the communication channel between the acceleration sensor and the internal microphone is based on measurements of the residual noise signal in response to one or more measured accelerations of the ANR headphones (Pan, Par 0019: "The sensor may be either a microphone or an accelerometer."; Pan, Par 0021: "Transfer functions from each sound transducer to the sensor location are measured and stored, and transfer functions from each sound transducer to the evaluation location are measured and stored."; See also Pan, Par 0041: "Determining transfer functions from loudspeakers to sensors and/or to the ear(s) of a listener (i.e., the evaluation locations) is known in the art. For example, a filter can be synthesized that has a transfer function that matches the measured transfer function from one source to one position A filter is then synthesized that has the same impulse response as the measured transfer function..."). It would have been obvious to a person of ordinary skill in the art before the effective filing date of the claimed invention to have used the teaching of 'wherein the impulse response of the communication channel between the acceleration sensor and the internal microphone is based on measurements of the residual noise signal in response to one or more measured accelerations of the ANR headphones' in Hua's modified invention as taught by Pan's invention. The motivation for doing this would be for the ability to produce applicable filters between a variety of sound sources, such as speakers and accelerometer detected vibrations, versus a variety of sound sinks, such as microphones, acoustic sensors and accelerometers, and with each placed at different locations used for evaluation (Pan, Par 0041: "Such filters can be synthesized for each loudspeaker to each sensor and each evaluation location."). Claim 12 is rejected under 35 U.S.C. 103 as being unpatentable over Hua (U.S. Patent Application No. 2020/0020313 A1) in view of Fabry (U.S. Patent Application Publication No. 2023/0328462 A1) in further view of Christoph (U.S. Patent No. 10176795 B2). Regarding claim 12, Hua in view of Fabry teaches: The ANR headphones of claim 11. Hua is not relied upon herein to teach: wherein the controller is configured to determine the plurality of adaptive filter coefficients on the basis of a Filtered-x Least Mean Square, algorithm. Christoph teaches: wherein the controller is configured to determine the plurality of adaptive filter coefficients on the basis of a Filtered-x Least Mean Square, algorithm (Christoph, Col 3, Ln 60-62: " ...according to the Filtered X Least Mean Square (FXLMS) algorithm of the art updating of coefficients W of a matrix is basically achieved according to w(n+1)=w(n)+µ e(n) z(n)… "). It would have been obvious to a person of ordinary skill in the art before the effective filing date of the claimed invention to have used the teaching of 'wherein the controller is configured to determine the plurality of adaptive filter coefficients on the basis of a Filtered-x Least Mean Square, algorithm' in Hua's modified invention as taught by Christoph's invention. The motivation for doing this would be to have a standard and known algorithm of the art to update coefficients (Christoph, Col 3, Ln 61: " algorithm of the art updating of coefficients…”). Claim 13 is rejected under 35 U.S.C. 103 as being unpatentable over Hua (U.S. Patent Application No. 2020/0020313 A1) in view of Fabry (U.S. Patent Application Publication No. 2023/0328462 A1) in further view of Yasuda (U.S. Patent Application Publication No. 2013/0259252 A1). Regarding claim 13, Hua in view of Fabry teaches: The ANR headphones of claim 11, wherein the controller is configured to adjust the plurality of adaptive filter coefficients. Hua is not relied upon herein to teach: if the adjustments of the plurality of adaptive filter coefficients are within one or more pre-defined allowed ranges. Yasuda teaches: if the adjustments of the plurality of adaptive filter coefficients are within one or more pre-defined allowed ranges (Yasuda, Par 0063: " since control can start from a stable state by setting an initial value of the phase filter coefficient within the range which satisfies Inequality (15), control can be suppressed from being diverged and can be converged quickly." Yasuda sets the initial values within allowed pre-determined ranges so that the controller can execute control of the coefficients while they are within their pre-determined and allowable ranges.). It would have been obvious to a person of ordinary skill in the art before the effective filing date of the claimed invention to have used the teaching of 'if the adjustments of the plurality of adaptive filter coefficients are within one or more pre-defined allowed ranges' in Hua's modified invention as taught by Yasuda's invention. The motivation for doing this would be to prevent the control from diverging and instead can converge quickly (Yasuda, Par 0063: " control can be suppressed from being diverged and can be converged quickly..."). Claims 14 and 17 are rejected under 35 U.S.C. 103 as being unpatentable over Hua (U.S. Patent Application No. 2020/0020313 A1) in view of Shinmen (U.S. Patent Application Publication No. 2022/0095033 A1). Regarding claim 14, Hua teaches: The ANR headphones of claim 1. Hua is not relied upon herein to teach: wherein the ANR headphones further comprise an elastic housing configured to be inserted in the ear canal of a user. Shinmen teaches: wherein the ANR headphones further comprise an elastic housing configured to be inserted in the ear canal of a user (Shinmen, Fig.2, Housing 210; Shinmen, Par 0070: " forming the housing 210 by using the elastic or plastic silicone rubber and elastomer and the like..."). It would have been obvious to a person of ordinary skill in the art before the effective filing date of the claimed invention to have used the teaching of 'wherein the ANR headphones further comprise an elastic housing configured to be inserted in the ear canal of a user' in Hua's invention as taught by Shinmen's invention. The motivation for doing this would be to allow the ear piece to comfortably follow the shape of the ear canal (Shinmen, Par 0070: "a tip end of the housing 210 may also abut the inner wall of the ear canal and follow the shape of the ear canal..."). Regarding claim 17, Hua and Shinmen teaches: The ANR headphones of claim 14, wherein the external microphone is located outside of the elastic housing (Shinmen, Fig.2, Housing 210; Shinmen, Par 0070: " forming the housing 210 by using the elastic or plastic silicone rubber and elastomer and the like...") to detect the ambient noise signal (Hua, Par 0027: “To overcome the effects of sound modification that are due to obstructions, an external facing microphone, here an external microphone 202, is used to pick up ambient sound from outside of the aural canal 104 and outside of the headphone 206 (that is also referred to here as external sound.”). Claim 20 is rejected under 35 U.S.C. 103 as being unpatentable over Hua (U.S. Patent Application No. 2020/0020313 A1) in view of Fabry (U.S. Patent Application Publication No. 2023/0328462 A1) in further view of Christoph (U.S. Patent No. 10176795 B2). 20. (New) The ANR headphones of claim 19, wherein the controller is configured to feed the filtered ambient noise signal and the residual noise signal into a processing block implemented by the controller to estimate an acoustic transfer function of the fixed or adaptive ambient noise feedforward filter (Hua, Par 0037: “FIG. 9 is a system diagram of a headphone with a transparency feature that uses an external microphone 602 in a feedforward path with a feedforward filter 902… Here, both filters 902, 904 are controlled by a filter coefficient controller 906 that detects wind by analyzing one or more, e.g., all, of the signals from the external microphone 602, the accelerometer 706, and an internal microphone 610… Various versions of this system may combine features from the example shown in FIGS. 7 and 8, with added adjustability and controllability for the feedforward filter 902 and the feedback filter 904,” [0037], Hua, Par 0041: “With the filters 902, 904 tuned by the filter coefficient controller 906, the driver 608 produces sound in the aural canal 104 that has transparency (external sound is reproduced) with reduced wind noise, e.g., relative to the wind noise that is picked up by the external microphone 602, and also has occlusion effect mitigation”). Hua is not relied upon herein to teach a least mean square processing block however, Christoph teaches: wherein the controller is configured to determine the plurality of adaptive filter coefficients on the basis of a Filtered-x Least Mean Square, algorithm (Christoph, Col 3, Ln 60-62: " ...according to the Filtered X Least Mean Square (FXLMS) algorithm of the art updating of coefficients W of a matrix is basically achieved according to w(n+1)=w(n)+µ e(n) z(n)… "). It would have been obvious to a person of ordinary skill in the art before the effective filing date of the claimed invention to have used the teaching of 'wherein the controller is configured to determine the plurality of adaptive filter coefficients on the basis of a Filtered-x Least Mean Square, algorithm' in Hua's modified invention as taught by Christoph's invention. The motivation for doing this would be to have a standard and known algorithm of the art to update coefficients (Christoph, Col 3, Ln 61: " algorithm of the art updating of coefficients…”). Conclusion THIS ACTION IS MADE FINAL. Applicant is reminded of the extension of time policy as set forth in 37 CFR 1.136(a). A shortened statutory period for reply to this final action is set to expire THREE MONTHS from the mailing date of this action. In the event a first reply is filed within TWO MONTHS of the mailing date of this final action and the advisory action is not mailed until after the end of the THREE-MONTH shortened statutory period, then the shortened statutory period will expire on the date the advisory action is mailed, and any nonprovisional extension fee (37 CFR 1.17(a)) pursuant to 37 CFR 1.136(a) will be calculated from the mailing date of the advisory action. In no event, however, will the statutory period for reply expire later than SIX MONTHS from the mailing date of this final action. Any inquiry concerning this communication or earlier communications from the examiner should be directed to JOSEPH SAUNDERS whose telephone number is (571)270-1063. The examiner can normally be reached Monday-Thursday, 9:00 a.m. - 4 p.m., EST. Examiner interviews are available via telephone, in-person, and video conferencing using a USPTO supplied web-based collaboration tool. To schedule an interview, applicant is encouraged to use the USPTO Automated Interview Request (AIR) at http://www.uspto.gov/interviewpractice. If attempts to reach the examiner by telephone are unsuccessful, the examiner’s supervisor, Carolyn R Edwards can be reached at (571)270-7136. The fax phone number for the organization where this application or proceeding is assigned is 571-273-8300. Information regarding the status of published or unpublished applications may be obtained from Patent Center. Unpublished application information in Patent Center is available to registered users. To file and manage patent submissions in Patent Center, visit: https://patentcenter.uspto.gov. Visit https://www.uspto.gov/patents/apply/patent-center for more information about Patent Center and https://www.uspto.gov/patents/docx for information about filing in DOCX format. For additional questions, contact the Electronic Business Center (EBC) at 866-217-9197 (toll-free). If you would like assistance from a USPTO Customer Service Representative, call 800-786-9199 (IN USA OR CANADA) or 571-272-1000. /JOSEPH SAUNDERS JR/Primary Examiner, Art Unit 2692
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Prosecution Timeline

Dec 29, 2023
Application Filed
Sep 19, 2025
Non-Final Rejection mailed — §102, §103, §112
Nov 14, 2025
Response Filed
Aug 10, 2026
Final Rejection mailed — §102, §103, §112 (current)

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Prosecution Projections

3-4
Expected OA Rounds
73%
Grant Probability
94%
With Interview (+20.6%)
2y 10m (~0m remaining)
Median Time to Grant
Moderate
PTA Risk
Based on 767 resolved cases by this examiner. Grant probability derived from career allowance rate.

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