EP4319201A1 - Verfahren zur kalibrierung einer nomadischen audiovorrichtung, system zur kalibrierung einer nomadischen audiovorrichtung und computerprogrammprodukt dafür - Google Patents

Verfahren zur kalibrierung einer nomadischen audiovorrichtung, system zur kalibrierung einer nomadischen audiovorrichtung und computerprogrammprodukt dafür Download PDF

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Publication number
EP4319201A1
EP4319201A1 EP23189296.9A EP23189296A EP4319201A1 EP 4319201 A1 EP4319201 A1 EP 4319201A1 EP 23189296 A EP23189296 A EP 23189296A EP 4319201 A1 EP4319201 A1 EP 4319201A1
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EP
European Patent Office
Prior art keywords
calibration
microphone
portable
nomadic
filter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23189296.9A
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English (en)
French (fr)
Inventor
Vu Hoang Co Thuy
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Devialet SA
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Devialet SA
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Filing date
Publication date
Application filed by Devialet SA filed Critical Devialet SA
Publication of EP4319201A1 publication Critical patent/EP4319201A1/de
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • H04R29/004—Monitoring arrangements; Testing arrangements for microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
    • H04R2460/01—Hearing devices using active noise cancellation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/033—Headphones for stereophonic communication

Definitions

  • the present invention relates to a method for calibrating a portable audio device.
  • the invention also relates to a computer program product and a system for calibrating a portable audio system.
  • the invention relates to the field of manufacturing portable audio devices.
  • nomadic audio device means a device configured to restore, to a user of the device, audio content coming from an audio source, the device being transportable with the audio source.
  • the audio source is for example an MP3 player or a smartphone .
  • the portable audio device is an in-ear device, also called a pair of headphones.
  • the nomadic audio device is for example an extra-aural device, also called an audio headset.
  • a nomadic audio device comprises at least one nomadic speaker and preferably for each nomadic speaker, an internal nomadic microphone and at least one external nomadic microphone.
  • the portable speaker is configured to reproduce sound content coming from the source.
  • the internal portable microphone is oriented towards the portable speaker, and intended to be positioned between said portable speaker and an ear of the user.
  • the portable microphone is configured to acquire the audio signal broadcast by the portable speaker.
  • the external nomadic microphone is placed on a periphery of the nomadic audio device and oriented towards an exterior of the device.
  • the external portable microphone is configured to acquire the audio stream surrounding the portable audio device, such as the user's speech.
  • the nomadic loudspeaker, the external nomadic microphone and the nomadic loudspeaker allow, jointly with the source, to produce a hands-free kit telephony functionality.
  • the lyrics of the user are acquired by the external portable microphone and the words of a third party with whom the user is speaking are reproduced by the portable speaker.
  • the nomadic speaker, the internal nomadic microphone and the external nomadic microphone make it possible to implement an active reduction functionality of noise surrounding the nomadic audio device.
  • the surrounding noise is acquired by the external nomadic microphone.
  • This noise is processed by a filter and a signal is emitted to the portable speaker to cancel out with the surrounding noise having passed through the audio device.
  • the internal nomadic microphone makes it possible to control, through a respective filter, that residual noise at the user's eardrum is minimal. Feedback is provided to the portable speaker based on the signal acquired by the internal portable microphone.
  • each of the nomadic loudspeaker and the nomadic microphones presents a frequency response of its own.
  • Speakers and microphones are generally mass-produced components. It is therefore known to determine, for each model, a respective nominal frequency response and a maximum dispersion between the frequency response of a specific component and the nominal response associated with the model of the component.
  • the maximum dispersion is for example equal to plus or minus 3dB.
  • each filter of the portable audio device In an industrial context, it is often necessary to design each filter of the portable audio device according to the nominal frequency response of each component without taking into account the dispersion between the behavior of the components actually in the audio headset and their nominal behavior. In addition, the design of each filter generally does not take into account defects when assembling the components to form the portable audio device.
  • the filters are no longer necessarily adapted to the device obtained.
  • the present invention provides a method for calibrating a portable audio device, a computer program product and an associated calibration system to avoid such problems.
  • the performance of said device is improved depending on the performance of the portable speaker and the portable microphone actually present in the portable audio device and not only from the nominal model performance of these components.
  • the present invention also relates to a computer program product comprising software instructions, which, when executed by a computer, implement the calibration method as described above.
  • the present invention also relates to a system for calibrating a portable audio device, such as a headset or a pair of headphones, the portable audio device comprising at least one portable microphone, a portable speaker, the audio device nomad being suitable for being placed in the calibration system, the calibration system comprising a calibration microphone, a calibration speaker, and an electronic calibration device capable of executing software instructions of a computer program product described above.
  • a portable audio device such as a headset or a pair of headphones
  • the portable audio device comprising at least one portable microphone, a portable speaker, the audio device nomad being suitable for being placed in the calibration system
  • the calibration system comprising a calibration microphone, a calibration speaker, and an electronic calibration device capable of executing software instructions of a computer program product described above.
  • a nomadic audio device 10 is shown.
  • the nomadic audio device 10 is a pair of headphones.
  • the portable audio device is an audio headset.
  • the nomadic audio device 10 optionally includes a first audio channel CH1 and a second channel CH2.
  • the first audio channel CH1 is the left channel, i.e. intended to broadcast content to a user's left ear.
  • the second channel CH2 is a right channel, i.e. intended to broadcast content to a user's right ear.
  • the portable audio device 10 comprises, preferably for each audio channel CH1, CH2, a portable speaker 15 and at least one portable microphone 20, 25.
  • the nomadic audio device 10 comprises, preferably for each audio channel CH1, CH2, a connection point 30 with an audio source not shown, and a control unit 33.
  • the portable speaker 15 is configured to broadcast content from the audio source.
  • the nomadic speaker 15 is configured to broadcast content determined by the control unit 33, for example in order to achieve active noise reduction functionality.
  • the portable microphone 20, 25 is configured to acquire an audio signal.
  • the nomadic audio device 10 comprises, advantageously for each channel CH1, CH2, an internal nomadic microphone 20 and at least one external nomadic microphone 25.
  • the internal portable microphone 20, also called internal microphone 20, is configured to acquire the audio signal between the portable speaker 15 and the user's ear, in particular the audio signal broadcast by the portable speaker 15. then understands that, when the audio device is worn by a user, the internal portable microphone 20 is placed between the portable speaker 15 and an eardrum of the user. The internal nomadic microphone 20 is then configured to acquire the audio signal heard by the user.
  • the external nomadic microphone 25, also called external microphone 25, is configured to acquire an audio stream surrounding the nomadic audio device 10.
  • the external microphone 25 is arranged on a periphery of the nomadic audio device 10 and oriented towards an exterior of said device 10.
  • connection point 30 is configured to receive, from the audio source, content to be broadcast by the portable speaker 15.
  • the connection point 30 is for example configured to communicate with the audio source by a wired connection or, as represented on the figure 1 , by a wireless connection following a predefined protocol, such as the Bluetooth or WIFI protocol.
  • the control unit 33 is configured to control the signal sent to the portable loudspeaker 15 as a function of the signal received from the connection point 30, the signal acquired by the internal microphone 20 and the signal acquired by the external microphone 25.
  • the control unit 33 is connected to the portable speaker 15, to the internal microphone 20, to the external microphone 25 and to the connection point 30.
  • the control unit 33 is for example an electronic card comprising a plurality of software modules.
  • the control unit 33 comprises an adder 35, a first connection 50 connecting the adder 35 and the nomadic speaker 15, a second connection 55 connecting the internal microphone 20 and the adder 35, a third connection 60 connecting the external microphone 25 and the adder 35 and preferably a fourth connection 65 connecting the connection point 30 and the adder 35.
  • the control unit 33 comprises for example a conversion and amplification block 70 on the first connection 50.
  • the block 70 is for example formed of a specific DAC converter ( Digital-to-Analog Converter ). to convert a digital signal coming from the adder 35 into an analog excitation signal from the portable loudspeaker 15, and from an amplifier of the analog signal.
  • DAC converter Digital-to-Analog Converter
  • the control unit 33 further preferably comprises a first predetermined filter HFB on the second connection 55.
  • the first predetermined filter HFB is configured to filter the signal acquired from the internal nomadic microphone 20 before sending it to the adder 35.
  • the control unit 33 further preferably comprises a second predetermined filter HFF on the third connection 60.
  • the second predetermined filter HFF is configured to filter the signal acquired from the external nomadic microphone 25 before transmitting it to the adder 35.
  • the first HFB and second HFF predetermined filters are for example designed according to a nominal frequency response of the internal 20 and external 25 microphones, as provided by a manufacturer of said microphones and measured on reference prototypes.
  • the control unit 33 further comprises an HEQ equalizer on the fourth connection 65.
  • the HEQ equalizer is configured to perform equalization of the signal coming from the connection point 30 before transmitting it to the adder 35.
  • the nomadic audio device 10 is coupled with a calibration system 75 to calibrate said audio device 10.
  • a calibration system 75 to calibrate said audio device 10.
  • only one channel CH1, CH2 of the nomadic audio device 10 is represented.
  • the calibration system 75 comprises a calibration microphone 80, a calibration speaker 85 and an electronic calibration device 90 capable of being connected to the calibration microphone 80 and to the calibration speaker 85.
  • the calibration microphone 80 and the calibration speaker 85 are placed in an acoustically hermetic box 95.
  • the calibration microphone 85 is positioned contiguous to the internal nomadic microphone 20, for example within an artificial ear not shown.
  • the calibration speaker 85 is positioned outside the portable audio device 10.
  • the calibration microphone 80 and the calibration speaker 85 are connected to the electronic calibration device 90 as visible on the figure 2 in solid line.
  • the portable speaker 15, the internal microphone 20, and the external microphone 25 are connected to the electronic calibration device 90, as shown in the figure 2 in mixed line.
  • the electronic calibration device 90 is located outside the box 95.
  • the electronic calibration device 90 is for example a computer comprising a memory 96 and a processor 97 capable of executing software instructions stored in the memory 96.
  • the memory 96 stores a computer program comprising software instructions which, when executed by the processor 97, implement a method of calibrating the portable audio device 10 as described below.
  • the method of calibrating the portable audio device 10 comprises a transmission phase during which an audio signal is sent to one of the portable speakers 15 and the calibration speaker 85.
  • the transmission phase preferably firstly comprises a first PE_nomade transmission step during which the calibration device 90 sends to the nomadic loudspeaker 15, an audio signal, called the first audio signal.
  • the nomadic loudspeaker 15 emits the first audio signal towards the internal nomadic microphone 20 and the calibration microphone 80.
  • the first audio signal is for example a continuous sinusoidal sweep (from the English, sweep ) .
  • the calibration method comprises a phase of calibrating at least one of the nomadic speaker 15, the internal nomadic microphone 20 and the external nomadic microphone 25.
  • the calibration phase preferably includes a PC_SPK step for calibrating the portable loudspeaker 15.
  • the PC_SPK calibration step comprises a first reception sub-step 112, during which the electronic calibration device 90 receives, from the calibration microphone 80, the signal resulting from the acquisition by said microphone of the first audio signal emitted by the portable speaker 15.
  • the calibration step PC_SPK further comprises a first determination sub-step 114, during which the calibration device 90 determines a first calibration filter H_calib_SPK from the signal received from the calibration microphone 80.
  • the first calibration filter H_calib_SPK is a digital filter including a gain whose value changes frequently. By “a gain whose value changes frequency” is meant the fact that the gain takes distinct values depending on the frequency of the signal which is supplied to the associated filter.
  • the first calibration filter H_calib_SPK is specific to the portable speaker 15.
  • the first determination sub-step 114 advantageously comprises the calculation of a frequency error Err(f) between the signal received during the first reception sub-step 112 and a first predetermined reference signal.
  • the first reference signal corresponds to the signal that the calibration microphone 80 should have acquired if the frequency response of the portable loudspeaker 15 was exactly the nominal frequency response of a reference product.
  • the calibration device 90 calculates a Fourrier transform of the signal received from the calibration microphone 80.
  • the signal resulting from the Fourrier transform includes an amplitude and a phase evolving respectively frequency.
  • the calibration device 90 advantageously performs a detection of extremum(s) f ext i in the frequency error Err(f).
  • the calibration device 90 calculates for example a derivative of the frequency error Err(f) as a function of the frequency and determines each frequency f ext i for which said derivative vanishes.
  • the calibration device 90 calculates preferentially, for each determined extremum f ext i , a frequency band B i around said extremum f ext i .
  • Two successive frequency bands B i-1 , B i are contiguous.
  • each frequency band B i includes a lower limit f 1 i and an upper bound f 2 i .
  • the lower bound f 1 i of the frequency band B i is the upper limit f 2 i of the previous frequency band B i-1 .
  • the lower bound f 1 1 of the first frequency band B 1 is the minimum frequency for which the frequency error Err(f) is defined.
  • each frequency band B i contains an extremum f ext i of the frequency error Err(f).
  • the calibration device 90 determines for example, for each extremum f ext i , a configurable unit filter H i as a function of the frequency error Err(f) in the frequency band B i associated with said extremum f ext i .
  • Each configurable unit filter H i is for example a peak or trough filter (peak-notch) known in itself.
  • This H i filter is characterized by three parameters: a central frequency f vs i , a gain A i and a quality factor Q i .
  • the central frequency f vs i corresponds to the frequency for which the configurable unit filter H i has the highest gain.
  • the gain A i corresponds to the maximum gain of the configurable unit filter, for example its gain at the central frequency f vs i for a peak-notch filter.
  • the quality factor Q i quantifies the size of the bandwidth of the configurable unit filter.
  • the previous equation corresponds to the frequency error if the received signal was filtered by the configurable unit filter H i .
  • the optimization algorithm is for example a gradient descent algorithm.
  • the calibration device 90 obtains optimized parameters f vs , opt i , HAS opt i And Q opt i of the configurable unitary filter H i .
  • the calibration device 90 determines a respective configurable unit filter H i for each extremum f ext i , and therefore for each associated frequency band B i .
  • the calibration device 90 generates the first calibration filter H_calib_SPK, for example from each parameterizable unit filter H i determined previously, for example by putting each of the parameterizable unit filters H i in series.
  • the calibration phase optionally also includes a PC_FB calibration step of the internal nomadic microphone 20.
  • the internal portable microphone 20 acquires the first audio signal emitted.
  • the PC_FB step of calibrating the internal nomadic microphone 20 comprises a second reception sub-step 122 during which the calibration device 90 receives the first audio signal acquired by the internal microphone 20.
  • the step PC_FB of calibrating the internal microphone 20 comprises a sub-step 123 of applying the first calibration filter H_calib_SPK to the signal received from the internal microphone 20, to form a filtered signal.
  • the PC_calib_FB step includes a second determination substep 124, during which the calibration device 90 determines a second calibration filter H_calib_FB from the filtered signal.
  • the second calibration filter H_calib_FB is also a digital filter comprising a gain whose value changes frequently.
  • the second calibration filter H calib_FB is specific to the internal nomadic microphone 20.
  • the second determination sub-step 124 is analogous to the first determination sub-step 114 with the difference that the determination is carried out from the signal received by the internal nomadic microphone 20 filtered by the H_calib_SPK function and not from the signal received from the 80 calibration microphone.
  • the second calibration filter H_calib_FB is determined.
  • the transmission phase includes a PE_calib step of sending a second audio stream to be broadcast by the calibration loudspeaker 85.
  • the second audio signal is emitted by the loudspeaker calibration speaker 85.
  • the second audio signal emitted is acquired by the external nomadic microphone 25.
  • the second audio signal is for example a continuous sinusoidal sweep .
  • the calibration phase includes for example a step PC_FF for calibrating the external nomadic microphone 25.
  • the PC_FF step of calibrating the external nomadic microphone 25 comprises a third reception sub-step 132 during which the calibration device 90 receives the signal acquired by the external nomadic microphone 25 following the transmission of the second audio signal from above -85 calibration speaker.
  • the step PC_FF of calibrating the external nomadic microphone 25 further comprises a third determination sub-step 134 during which a third calibration filter H_calib_FF is determined from the signal received from the external nomadic microphone 25.
  • the third calibration filter H_calib_FF is also a digital filter including a gain whose value changes frequently.
  • the third calibration filter H_calib_FF is specific to the external nomadic microphone 25.
  • the third determination sub-step 134 is for example analogous to the first determination sub-step 114 and to the second the determination sub-step 124, with the exception that the third calibration filter H_calib_FF is determined from the signal received from the external nomadic microphone 25 rather than the signal received from the calibration microphone 80 or from the internal nomadic microphone 20.
  • the third calibration filter H_calib_FF is determined.
  • the calibration method further comprises a PI implementation phase preferably comprising a first implementation step 142 during which the first calibration filter H_calib_SPK is implemented in the nomadic audio device 10, more precisely on the first connection 50 of the control unit 33.
  • the first calibration filter H_calib_SPK is implemented between the adder 35 and the block 70.
  • the PI implementation phase further preferably comprises a second implementation step 144 during which the second calibration filter H_calib_FB is implemented in the portable audio device 10, and more particularly on the second connection 55 of the control unit 33
  • the second calibration filter H calib_FB is implemented between the internal nomadic microphone 20 and the first predetermined filter HFB.
  • the implementation phase PI further preferably comprises a third implementation step during which the third calibration filter H_calib_FF is implemented in the portable audio device 10, and preferably on the third connection 60 of the control unit 33.
  • the third calibration filter H calib_FF is implemented between the external nomadic microphone 25 and the second predetermined filter HFF.
  • the portable speaker 15, the internal portable microphone 20, and an external portable microphone 25 are calibrated.
  • values of the or each calibration filter H_calib_SPK, H_calib_FB, H_calib_FF are stored in the control unit 33, and preferably in the memory 96 of the control unit
  • the calibration process described above is iterated for each audio channel CH1, CH2.
  • the PE_calib sending step of the second audio signal and the PC_FF calibration step of the external nomadic microphone 25 are implemented prior to the PE_nomade step of sending the first audio signal.
  • the audio device 10 preferably each audio channel CH1, CH2, comprises a plurality of microphones external nomads 25 i .
  • the control unit 33 comprises a plurality of third connections 60 i connecting respectively an internal nomadic microphone 25 i and the summator 35.
  • the control unit 33 comprises, on each of these connections 60 i , a second respective predetermined filter HFF i .
  • each external nomadic microphone 25 i acquires the second audio signal resulting from said transmission.
  • the calibration phase then comprises, for each external nomadic microphone 25, a step PC_FF i of calibrating said external nomadic microphone 25 during which a third filter H_calib_FF i respective of the external nomadic microphone 25 i is determined.
  • the implementation phase comprises, for each external nomadic microphone 25 i , a third respective implementation step 146 i , during which the respective third calibration filter H_calibr_FF i is implemented on the connection 60 i associated with said external portable microphone 25 i .
  • each configurable unit filter H i is a stepped low-pass filter (from the English Lowshelf) or a stepped high-pass filter (from the English Highshelf).
  • the parameters of the configurable unit filter H i are the same as when it is of the Peak-notch type.
  • a Lowshelf or Highshelf filter defines a respectively decreasing or increasing slope.
  • Each configurable unit filter H i of the form Lowshelf or Highshelf is parameterized by a central frequency f vs i , a gain A i and a quality factor Q i .
  • the central frequency f vs i corresponds to the frequency at the middle of the slope of the Lowshelf or Highshelf filter.
  • the gain A i corresponds to the maximum gain of the configurable unit filter.
  • the quality factor Q i quantifies the steepness of the slope of the Lowshelf or Highshelf type filter.
  • a pre-cutting in frequency is carried out in a predefined manner forming a plurality of frequency portions.
  • the width of a frequency portion being greater than the width of a frequency band B i .
  • a maximum number of configurable unit filters H i per frequency portion is predefined.
  • the phase transmission only includes one transmission step PE_nomad, PE_calib.
  • the calibration phase only includes a PC_SPK, PC_FB, PC_FF calibration step.
  • a single calibration filter H_calib_SPK, H_calib_FB, H_calib_FF is determined and implemented in the portable audio device 10.
  • the method according to the invention therefore makes it possible to avoid problems linked to the variance of the frequency responses of the components of the audio device compared to a nominal frequency response. Indeed, after application of the method, the behavior of each calibrated component is close to the nominal frequency response provided by the manufacturer for the model of said component.
  • the determination of calibration filter(s) specific to each of the nomadic speaker 15, the internal nomadic microphone 20 and the external nomadic microphone 25 actually in the nomadic audio device 10 allows customization of the correction provided and therefore improves all the more the user experience.
  • the method according to the invention being capable of being implemented by a computer program product, it does not require any human intervention. This process is therefore quick and efficient.
  • the PC_FB step of calibrating the internal microphone 20 overcomes the error presented by the nomadic loudspeaker 15 before its calibration.
  • the application step 123 has the same effect as if the signal acquired by the internal microphone 20 had been emitted by the calibrated nomadic loudspeaker 15. This step accelerates the calibration process since it allows only one transmission to be carried out by the portable speaker 15 to calibrate both said portable speaker 15 and the internal microphone 20.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
EP23189296.9A 2022-08-03 2023-08-02 Verfahren zur kalibrierung einer nomadischen audiovorrichtung, system zur kalibrierung einer nomadischen audiovorrichtung und computerprogrammprodukt dafür Pending EP4319201A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR2208063A FR3138750A1 (fr) 2022-08-03 2022-08-03 Procédé de calibrage d’un dispositif audio nomade, système de calibrage d’un dispositif audio nomade et produit programme d’ordinateur associés

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Publication Number Publication Date
EP4319201A1 true EP4319201A1 (de) 2024-02-07

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EP23189296.9A Pending EP4319201A1 (de) 2022-08-03 2023-08-02 Verfahren zur kalibrierung einer nomadischen audiovorrichtung, system zur kalibrierung einer nomadischen audiovorrichtung und computerprogrammprodukt dafür

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EP (1) EP4319201A1 (de)
CN (1) CN117528377A (de)
FR (1) FR3138750A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170110106A1 (en) * 2015-10-16 2017-04-20 Avnera Corporation Calibration and stabilization of an active notice cancelation system
US20200005759A1 (en) * 2018-02-01 2020-01-02 Cirrus Logic International Semiconductor Ltd. System and method for calibrating and testing an active noise cancellation (anc) system
US20210127221A1 (en) * 2019-10-25 2021-04-29 Synaptics Incorporated System and method for self-calibrating audio listening devices

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170110106A1 (en) * 2015-10-16 2017-04-20 Avnera Corporation Calibration and stabilization of an active notice cancelation system
US20200005759A1 (en) * 2018-02-01 2020-01-02 Cirrus Logic International Semiconductor Ltd. System and method for calibrating and testing an active noise cancellation (anc) system
US20210127221A1 (en) * 2019-10-25 2021-04-29 Synaptics Incorporated System and method for self-calibrating audio listening devices

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CN117528377A (zh) 2024-02-06

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