Vehicle active noise control method and system

Abstract

In an active noise control method and system for a vehicle, the active noise control method for the vehicle includes receiving, by a head unit, a noise signal detected by at least one wireless headset in the vehicle, generating, by an amplifier (AMP) controller, a target output signal corresponding to a sound to be provided to a passenger, generating, by an acoustic design processor (ADP) controller operably connected to an amplifier (AMP) controller, a phase signal opposite to a signal obtained by subtracting the target output signal from the noise signal, and transmitting, by the head unit, the generated opposite phase signal to the at least one wireless headset.

Description

Technical Field

[0001] The present disclosure relates to an active noise control system for a vehicle, and more particularly, to a method and system for providing active noise control for a passenger sitting in a vehicle and wearing wireless headphones. Background Art

[0002] Active noise control (ANC) refers to a technique of blocking noise by inputting ambient noise through a microphone and then allowing a noise cancellation circuit to generate cancellation interference to eliminate the ambient noise. Since sound is a wave, it is generally possible to cancel or reduce unwanted noise by generating a sound cancellation wave to interfere with the unwanted audible noise in a canceling manner.

[0003] In recent years, the above functions have been applied to wireless headphones, headsets, etc. with noise cancellation functions. In recent years, active noise control functions, such as road active noise cancellation (RANC), have been increasingly applied to newly released vehicles.

[0004] At the same time, noise cancellation has a technical limitation that the position of the microphone and the position of the ear need to be close to each other at high-frequency wavelengths to optimize the performance of noise cancellation. However, in a vehicle, it is difficult to install the microphone close to the passenger's ear. Therefore, to address this difficulty, passengers wear wireless microphones to overcome the physical limitation.

[0005] However, when a passenger wearing a wireless microphone is sitting in a vehicle, the active noise control system of the vehicle and the wireless microphone operate independently, which often causes inconvenience to the passenger when using the wireless microphone. For example, when the active noise control function of the wireless microphone is activated in a vehicle, the active noise control function identifies all sounds generated by the system in the vehicle (such as alarm sounds, media sounds, and navigation notification sounds) as noise and removes these sounds. For this reason, there is an inconvenience that the wireless microphone worn by the passenger needs to be removed to ensure vehicle safety.

[0006] Therefore, in the field of the present disclosure, there is a need for a technique to provide an in-vehicle active noise control system with improved noise cancellation performance and to provide necessary sounds to passengers while eliminating unnecessary noise in the vehicle.

[0007] The information included in the background art of the present disclosure is only used to enhance the understanding of the general background of the present disclosure and cannot be regarded as an admission or an indication in any form that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0008] Aspects of the present disclosure are directed to providing an in-vehicle active noise control system with improved noise cancellation performance.

[0009] Aspects of the present disclosure also relate to providing an active noise control system configured to provide necessary sounds to passengers while canceling unnecessary noises in a vehicle.

[0010] Aspects of the present disclosure also relate to providing an active noise control system configured to exhibit noise cancellation performance optimized for each seat in a vehicle.

[0011] As the technical problems to be solved by the exemplary embodiments of the present disclosure are not limited to the above technical problems, for those skilled in the art of the exemplary embodiments of the present disclosure, other technical problems not mentioned above can be clearly understood from the following description. An active noise control method for a vehicle according to various exemplary embodiments of the present disclosure includes: receiving, by a head unit, a noise signal detected by at least one wireless earphone in the vehicle; generating, by an amplifier (AMP) controller, a target output signal corresponding to the sound to be provided to a passenger; generating, by an acoustic design processor (ADP) controller operably connected to the amplifier (AMP) controller, an anti-phase signal opposite to a signal obtained by subtracting the target output signal from the noise signal; and transmitting, by the head unit, the generated anti-phase signal to at least one wireless earphone.

[0012] In an embodiment of the present disclosure, the active noise control method of the vehicle may further include: transmitting, by the AMP controller, the target output signal to a speaker.

[0013] In an embodiment of the present disclosure, the target output signal may include a plurality of different target output signals to be sent to seats in the vehicle, and the different target input signals may be respectively sent to speakers corresponding to the seats.

[0014] In an embodiment of the present disclosure, the active noise control method of the vehicle may further include: receiving, by the AMP controller, a noise signal from the head unit.

[0015] In an embodiment of the present disclosure, the active noise control method of the vehicle may further include: receiving, by the ADP controller, acceleration information from an acceleration sensor and applying the acceleration information to the noise signal.

[0016] In an embodiment of the present disclosure, transmitting the generated anti-phase signal to at least one wireless earphone may include transmitting an anti-phase signal opposite to the noise signal detected by the wireless earphone corresponding to each seat to the wireless earphone corresponding to each seat.

[0017] In an embodiment of the present disclosure, the target output signal may include at least one of an alarm sound, a navigation notification sound, and a sound source in the vehicle and combinations thereof.

[0018] Meanwhile, an active noise control system for a vehicle according to various exemplary embodiments of the present disclosure includes: a head unit configured to receive a noise signal detected by at least one wireless earphone operably connected to the head unit in the vehicle; an amplifier (AMP) controller configured to generate a target output signal corresponding to the sound to be provided to a vehicle passenger; and an acoustic design processor (ADP) controller configured to generate an anti-phase signal opposite to the signal obtained by subtracting the target output signal from the noise signal, wherein the head unit sends the generated anti-phase signal to the at least one wireless earphone.

[0019] In an embodiment of the present disclosure, the AMP controller may be configured to send the target output signal to a speaker.

[0020] In an embodiment of the present disclosure, the target output signal may include a plurality of different target output signals to be sent to seats in the vehicle, and the different target input signals may be respectively sent to speakers corresponding to the seats.

[0021] In an embodiment of the present disclosure, the AMP controller is configured to receive the noise signal from the head unit.

[0022] In an embodiment of the present disclosure, the ADP controller is configured to receive information about acceleration from an acceleration sensor and apply the acceleration information to the noise signal.

[0023] In an embodiment of the present disclosure, the head unit may send an anti-phase signal opposite to the noise signal detected by the wireless earphone corresponding to each seat to the wireless earphone corresponding to each seat.

[0024] In an embodiment of the present disclosure, the target output signal may include at least one of an alarm sound, a navigation notification sound, and a sound source in the vehicle and combinations thereof.

[0025] Various aspects of the present disclosure aim to provide improved noise cancellation performance for an in-vehicle active noise control system.

[0026] In addition, while eliminating unnecessary noise in the vehicle, necessary sounds can be provided to passengers.

[0027] In addition, noise cancellation performance optimized for each seat in the vehicle can be exhibited.

[0028] In addition, by providing an operation algorithm, an improved human-machine interface can be provided, which intelligently operates in cooperation with the vehicle system when a passenger wears a wireless earphone and sits in the vehicle.

[0029] The methods and apparatuses of the present disclosure have other features and advantages that will be apparent or more particularly set forth in the accompanying drawings and the following detailed description, which together serve to explain certain principles of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a view exemplarily showing an example of a general active noise control (ANC) system.

[0031] Figure 2 is a view schematically showing the configuration of an active noise control system according to various exemplary embodiments of the present disclosure.

[0032] Figure 3 is a view schematically showing the configuration of an active noise control system according to various exemplary embodiments of the present disclosure.

[0033] Figure 4 is a view exemplarily showing an active noise control method for a vehicle according to an exemplary embodiment of the present disclosure.

[0034] Figure 5 is a view exemplarily showing active noise control methods for a vehicle according to various exemplary embodiments of the present disclosure.

[0035] It will be understood that the drawings are not necessarily drawn to scale and present various features in a somewhat simplified manner to illustrate the basic principles of the present disclosure. The predetermined design features of the present disclosure included herein (including, for example, specific dimensions, orientations, positions, and shapes) will be determined in part by the particular intended application and use environment. In the drawings, reference numerals refer to the same or equivalent parts of the present disclosure throughout the several views of the drawings. DETAILED DESCRIPTION

[0036] Reference will now be made in detail to various embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings and described below. While the present disclosure will be described in conjunction with the exemplary embodiments of the present disclosure, it should be understood that this description is not intended to limit the present disclosure to those exemplary embodiments. On the contrary, the present disclosure is not only intended to cover the exemplary embodiments of the present disclosure, but also covers various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the present disclosure as defined by the appended claims. The present disclosure will be described in detail below with reference to the accompanying drawings. Here, repetitive descriptions and detailed descriptions of well-known functions and configurations will be omitted, because these repetitive descriptions and detailed descriptions may unnecessarily obscure the subject matter of the present disclosure. Exemplary embodiments of the present disclosure are provided to more completely explain the exemplary embodiments of the present disclosure to those of ordinary skill in the art. Therefore, for a clearer description, the shapes and sizes of the elements shown in the drawings may be exaggerated. Hereinafter, various exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings.

[0037] Figure 1 is a view exemplarily showing an example of a general active noise control (ANC) system.

[0038] Referring to Figure 1 , a general active noise control (ANC) system includes an acceleration sensor 110, a microphone 120, an ADP controller 130, and a speaker 140.

[0039] The acceleration sensor 110 detects the body vibration from the road surface.

[0040] In an embodiment of the present disclosure, the acceleration sensor 110 may be disposed on the floor of the vehicle body.

[0041] In an embodiment of the present disclosure, the acceleration sensor 110 may include a plurality of acceleration sensors. For example, four acceleration sensors may be disposed on the floor of the vehicle body.

[0042] The microphone 120 detects the noise transmitted from the outside of the vehicle to the inside of the vehicle.

[0043] In an embodiment of the present disclosure, the microphone 120 may be disposed on the ceiling of the vehicle.

[0044] In an embodiment of the present disclosure, the microphone 120 may include a plurality of microphones. For example, eight microphones may be disposed on the ceiling of the vehicle.

[0045] The ADP controller 130 is configured to control noise cancellation in the vehicle. For example, the ADP controller 130 generates a sound signal capable of canceling the noise transmitted from the outside of the vehicle based on the sensing information detected by the acceleration sensor 110 and the noise received by the microphone 120.

[0046] The speaker 140 outputs the sound signal generated by the ADP controller 130, and the sound signal can cancel the noise transmitted from outside the vehicle.

[0047] In an embodiment of the present disclosure, the speaker 140 may be disposed in multiple areas in the vehicle. For example, the speaker 140 may be disposed in four doors of the vehicle. In addition, the speaker 140 may further include a center speaker and a subwoofer.

[0048] Figure 2 is a view schematically showing the configuration of an active noise control system according to various exemplary embodiments of the present disclosure.

[0049] Reference Figure 2 , the active noise control system 200 according to an exemplary embodiment includes a wireless headset 210, a user terminal 230, a head unit 250, and an active noise control device 270.

[0050] The wireless headset 210 transmits information about the operation mode to the head unit 250 through the user terminal 230. The wireless headset 210 receives an alarm sound, a navigation notification sound, or a sound source in the vehicle from the head unit 250 and outputs these sounds.

[0051] In addition, the wireless headset 210 may be provided with a microphone and transmit the sound signal received from the wireless headset 210 to the head unit 250.

[0052] In an embodiment of the present disclosure, the operation mode may include a noise cancellation mode for blocking external noise, a transparent mode for transmitting external noise, and a neutral mode for outputting sounds unrelated to external noise.

[0053] In an embodiment of the present disclosure, the wireless headset 210 may perform communication with the user terminal 230 or the head unit 250 by using Bluetooth communication. Alternatively, the wireless headset 210 may perform communication by using other wireless communication methods such as Wi-Fi.

[0054] In an embodiment of the present disclosure, the user can play an alarm sound and a navigation notification sound in the vehicle through the audio player in the head unit 250, and simultaneously play sound sources such as MP3 and radio.

[0055] The user terminal 230 is connected to the head unit 250 and transmits information about the connection of the wireless headset 210 and information about the operation mode to the head unit 250.

[0056] In an embodiment of the present disclosure, the user terminal 230 may include multiple user terminals, and these user terminals may be simultaneously connected to the head unit 250 in each seat.

[0057] In an embodiment of the present disclosure, the user terminal 230 may transmit information related to which seat the terminal is located in and information related to which terminal the wireless earphone 210 is connected to, to the head unit 250. Accordingly, the head unit 250 may identify the presence or absence of the wireless earphone 210 connected to each seat.

[0058] In an embodiment of the present disclosure, the user terminal 230 may be applied to various terminals, such as a smart phone, a portable terminal, a mobile terminal, a foldable terminal, a personal digital assistant (PDA), a portable multimedia player (PMP) terminal, a telematics terminal, a navigation terminal, a personal computer, a laptop computer, a tablet computer, a tablet PC, an ultrabook, a wearable device (e.g., including a watch-type terminal (smart watch), a glass-type terminal (smart glass), and a head-mounted display (HMD)), a Wibro terminal, an Internet protocol television (IPTV) terminal, a smart TV, a digital broadcast terminal, an audio video navigation (AVN) terminal, an audio / video (A / V) system, a flexible terminal, and a digital signage device. In an embodiment of the present disclosure, information transmission and reception between the wireless earphone 210 and the user terminal 230 or between the head unit 250 and the user terminal 230 may be performed through an application program, an Internet browser, etc. provided in the user terminal 230.

[0059] The head unit 250 receives information about the connection of the wireless earphone 210 and information about the operation mode from the user terminal 230, and transmits the information to the active noise control device 270. The head unit 250 receives a sound signal detected by a microphone of the wireless earphone 210, receives a sound signal to be output from the wireless earphone 210 from the active noise control device 270, and transmits the sound signal to the wireless earphone 210.

[0060] The active noise control device 270 receives information about the connection of the wireless earphone 210 and information about the operation mode from the head unit 250, and transmits a sound signal to be output from the wireless earphone 210 to the head unit 250.

[0061] In an embodiment of the present disclosure, the sound signal to be output from the wireless earphone 210 may include a phase signal opposite to external noise, as well as an alarm sound, a navigation notification sound, or a sound source in a vehicle.

[0062] Figure 3 is a view schematically showing a configuration of an active noise control system according to various exemplary embodiments of the present disclosure.

[0063] Reference Figure 3 , the active noise control system 300 according to an exemplary embodiment includes a wireless earphone 310, a head unit 350, and an active noise control device 370.

[0064] The wireless earphone 310 detects sounds in the vehicle in real time through an embedded microphone and sends the sounds to the head unit 350.

[0065] In an embodiment of the present disclosure, the wireless earphone 310 may perform communication with the head unit 350 by using Bluetooth communication. Alternatively, the wireless earphone 310 may perform communication by using other wireless communication methods such as Wi-Fi.

[0066] In addition, the wireless earphone 310 may receive a phase signal opposite to external noise, as well as an alarm sound, a navigation notification sound, or a sound source in the vehicle, from the head unit 350, and output the signal and the sound.

[0067] The head unit 350 receives the sound signal detected by the microphone of the wireless earphone 310, receives the sound signal to be output from the wireless earphone 310 from the active noise control device 370, and sends the sound signal to the wireless earphone 310.

[0068] The active noise control device 370 receives the sound signal detected by the microphone of the wireless earphone 310 from the head unit 350, generates the sound signal to be output from the wireless earphone 310, and sends the sound signal to the head unit 350.

[0069] The active noise control device 370 includes an amplifier (AMP) controller 371, an acoustic design processor (ADP) controller 373, a speaker 375, and an acceleration sensor 377.

[0070] The AMP controller 371 adds the sound signal that actually needs to be output from the wireless earphone 310 connected to each seat to the phase signal opposite to external noise generated by the acoustic design processor (ADP) controller 373, and sends the resulting sound signal to the head unit 350.

[0071] In addition, the AMP controller 371 receives the sound signal detected by the microphone of the wireless earphone 310 from the head unit 350, and sends the sound signal to the ADP controller 373.

[0072] The ADP controller 373 receives the sound signal detected by the microphone of the wireless earphone 310 from the AMP controller 371, generates a phase signal opposite to external noise based on the sound signal, and sends the generated phase signal opposite to external noise to the AMP controller 371.

[0073] In an embodiment of the present disclosure, the ADP controller 373 may receive information about acceleration from the acceleration sensor 377, and generate a phase signal opposite to external noise based on the sound signal detected by the microphone of the wireless earphone 310 and the information about acceleration received from the acceleration sensor 377.

[0074] The speaker 375 receives an alert sound, a navigation notification sound, or a sound source in the vehicle from the AMP controller 371 and outputs the sound.

[0075] In an embodiment of the present disclosure, the speaker 375 may be disposed in multiple areas in the vehicle. For example, the speaker 375 may be disposed in the four doors of the vehicle. In addition, the speaker 375 may further include a center speaker and a subwoofer.

[0076] The acceleration sensor 377 detects the acceleration of the vehicle and sends the acceleration to the ADP controller 373.

[0077] Figure 4 is a view exemplarily showing an active noise control method for a vehicle according to an exemplary embodiment of the present disclosure.

[0078] According to Figure 3 the active noise control system in the exemplary embodiment may execute the active noise control method according to the exemplary embodiment.

[0079] An example of deactivating the output of the speaker 375 and outputting sound from the wireless headset 310 according to the active noise control method of the exemplary embodiment will be described.

[0080] When a noise cancellation mode for blocking external noise through the wireless headset 310 is set, the exemplary embodiment may be executed.

[0081] Refer to Figure 4 , the AMP controller 371 receives the noise signal detected by the wireless headset 310 from the head unit 350 (S410).

[0082] In an embodiment of the present disclosure, the wireless headset 310 may include multiple wireless headsets. The noise signal detected by the wireless headset 310 and received by the AMP controller 371 from the head unit 350 may be defined by Equation 1 below.

[0083] [Equation 1]

[0084] D(n) = d1(n) + d2(n) + d3(n) + …

[0085] In Equation 1, D(n) represents the signal obtained by adding all the noise signals detected by all the multiple wireless headsets forming the wireless headset 310, and d1(n), d2(n), and d3(n) respectively represent the noise signals detected by the wireless headsets forming the wireless earbuds 310.

[0086] Therefore, the noise signal detected by the wireless headset 310 and received by the AMP controller 371 from the head unit 350 may be defined as D(n).

[0087] In addition, the AMP controller 371 sends the noise signal received from the head unit 350 to the ADP controller 373 (S430).

[0088] In addition, in response to the noise signal received from the AMP controller 371, the ADP controller 373 generates an opposite-phase signal and sends the opposite-phase signal to the AMP controller 371 (S450).

[0089] In an embodiment of the present disclosure, the opposite-phase signal generated by the ADP controller 373 may be defined by Equation 2 below.

[0090] [Equation 2]

[0091] D'(n) = d'1(n) + d'2(n) + d'3(n) + …

[0092] In Equation 2, D'(n) represents the opposite-phase signal to D(n), that is, the opposite-phase signal to the noise signal detected by the wireless headset 310, d'1(n) represents the opposite-phase signal to d1(n), and d'2(n) and d'3(n) respectively represent the signals detected by the wireless headsets forming the wireless headset 310.

[0093] In addition, the AMP controller 371 generates a target output signal for each seat.

[0094] In an embodiment of the present disclosure, the target output signal for each seat may correspond to the sound to be provided to the passengers sitting on each seat.

[0095] For example, the target output signal for each seat may include at least one of an alarm sound, a navigation notification sound, and a sound source in the vehicle and combinations thereof.

[0096] In an embodiment of the present disclosure, the target output signal for each seat may be defined by Equation 3 below.

[0097] [Equation 3]

[0098] X(n) = X1(n) + X2(n) + X3(n) + …

[0099] In Equation 3, X(n) represents the signal obtained by adding all the target output signals of the seat, and X1(n), X2(n), and X3(n) represent the target output signals of the seat. For example, in a use case where there are four seats in the vehicle and different target signals are output to the four seats, different target output signals X1(n), X2(n), X3(n), and X4(n) may be generated.

[0100] In addition, the AMP controller 371 synthesizes the target output signal of the seat generated in step S470 with the opposite-phase signal received from the ADP controller 373, and transmits the synthesized signal to the head unit 350 (S480).

[0101] In an embodiment of the present disclosure, the signal obtained by synthesizing the opposite-phase signal received from the ADP controller 373 and the target output signals of all seats can be defined by the following formula 4.

[0102] [Formula 4]

[0103] Y(n) = X(n) + D'(n)

[0104] In formula 4, Y(n) represents the signal obtained by synthesizing the signals, which is obtained by adding the target output signals of all seats and the opposite-phase signals of the noise signals detected by all the headphones. X(n) is the signal obtained by adding all the target output signals of the seats. D'(n) represents the opposite-phase signal of D(n), that is, the opposite-phase signal of the noise signal detected by the wireless headphones 310.

[0105] In an embodiment of the present disclosure, Y(n) can be the sum of the signals to be sent to the seats and is defined by the following formula 5.

[0106] [Formula 5]

[0107] Y(n) = Y1(n) + Y2(n) + Y3(n) + …

[0108] In formula 5, Y(n) represents the signal synthesized by adding the target output signals of all seats and the opposite-phase signals of the noise signals detected by all the headphones, that is, the signal obtained by adding the signals to be sent to the wireless headphones. Y1(n), Y2(n), and Y3(n) represent the signals obtained by synthesizing the target output signals of the seats and the noise signals detected by the headphones.

[0109] In addition, the head unit 350 transmits the signal obtained by synthesizing the opposite-phase signal and the target output signal of each seat to the corresponding wireless headphone of each seat (S490).

[0110] For example, in a use case where there are four seats in a vehicle and signals are sent to passengers sitting in each seat and wearing different headphones, four different signals Y1(n), Y2(n), Y3(n), and Y4(n) can be sent.

[0111] Therefore, in a vehicle, the signal obtained by applying noise cancellation to the target output signal to be sent to the wireless headphones can be provided to the passengers sitting in each seat.

[0112] In an exemplary embodiment of the present disclosure, each of the AMP controller 371 and the ADP controller 373 may be implemented by a processor (e.g., a computer, a microprocessor, a CPU, an ASIC, a circuit, a logic circuit, etc.) or a single processor.

[0113] Figure 5 is a view exemplarily showing an active noise control method for a vehicle according to various exemplary embodiments of the present disclosure.

[0114] According to Figure 3 The active noise control system according to the exemplary embodiment in

[0115] An example of activating the output of the speaker 375 and applying noise cancellation through the wireless headset 310 in the active noise control method according to the exemplary embodiment will be described, in addition to the sound output from the speaker 375. In an embodiment of the present disclosure, the wireless headset 310 may output the sound to be output from the user terminal connected to the wireless headset 310.

[0116] When the noise cancellation mode for blocking external noise through the wireless headset 310 is set, the exemplary embodiment may be executed.

[0117] Referring to Figure 5 , the AMP controller 371 receives the noise signal detected by the wireless headset 310 from the head unit 350 (S510).

[0118] In an embodiment of the present disclosure, the wireless headset 310 may include a plurality of wireless headsets. The noise signal detected by the wireless headset 310 and received by the AMP controller 371 from the head unit 350 may be defined as D(n) in Equation 1.

[0119] In addition, the AMP controller 371 generates a target output signal and sends the target output signal together with the noise detected by the wireless headset 310 to the ADP controller 373 (S520).

[0120] In an embodiment of the present disclosure, the AMP controller 371 may be configured to: generate different target output signals for the seats, and the signal obtained by adding all the target output signals of the seats may be sent to the ADP controller 373.

[0121] In an embodiment of the present disclosure, the signal obtained by adding all the target output signals of the seats may be defined as X(n) in Equation 3, and the target output signals of the seats may be defined as X1(n), X2(n), and X3(n) respectively...

[0122] In addition, the ADP controller 373 receives information about the vehicle acceleration from the acceleration sensor 377 and applies the information about the acceleration to the noise signal (S530).

[0123] For example, the ADP controller 373 may be configured to generate a corrected noise signal by applying the information about the vehicle acceleration to the noise signal detected by the wireless headset 310, and then generate a phase signal opposite to the corrected noise signal, rather than a phase signal opposite to the noise detected by the wireless headset 310.

[0124] In addition, the ADP controller is configured to generate a phase signal opposite to the signal obtained by subtracting the target output signal from the noise signal, and send the opposite phase signal to the AMP controller (S540).

[0125] In an embodiment of the present disclosure, the ADP controller may be configured to generate a phase signal opposite to the signal obtained by subtracting the target output signal of each seat from the noise signal of the wireless headset corresponding to each seat.

[0126] In an embodiment of the present disclosure, the phase signal opposite to the signal obtained by subtracting the target output signal of each seat from the noise may be defined by Equation 6 below.

[0127] [Equation 6]

[0128] E'(n) = {D(n) – X(n)}

[0129] In Equation 6, E'(n) represents the phase signal opposite to the signal obtained by subtracting the target output signal of each seat from the noise signals detected by all the headsets, D(n) represents the noise signals detected by all the wireless headsets 310, and X(n) represents the signal obtained by adding up all the target output signals of the seats.

[0130] In an embodiment of the present disclosure, E'(n) may be generated by applying a signal to D(n), which is obtained by applying the acceleration information received from the acceleration sensor 377 to the noise signals detected by all the wireless headsets 310.

[0131] In an embodiment of the present disclosure, as shown in Equation 7 below, E'(n) may be the sum of the signals respectively sent to the seats.

[0132] [Equation 7]

[0133] E'(n) = E'1(n) + E'2(n) + E'3(n) + …

[0134] In Equation 7, E'(n) represents the phase-inverted signal of the signal obtained by subtracting the target output signal of each seat from the noise signals detected by all the headphones, that is, it represents the sum of the signals to be sent to all the headphones. E'1(n), E'2(n), and E'3(n) represent the phase-inverted signals of the signals obtained by subtracting the target output signal of the seat from the noise detected by the corresponding headphones.

[0135] In addition, the AMP controller 371 sends the target output signal to the speaker 375 and sends the phase-inverted signal received from the ADP controller 373 to the head unit 350 (S550).

[0136] In an embodiment of the present disclosure, the AMP controller 371 may send the target output signal of each seat to the speaker 375 corresponding to the seat.

[0137] In addition, the head unit 350 sends the phase-inverted signal received from the AMP controller 371 to the wireless headphone 310 corresponding to the seat (S560).

[0138] In an embodiment of the present disclosure, the head unit 350 may send the phase-inverted signal of the noise signal detected by the wireless headphone corresponding to the seat to the wireless headphone corresponding to the seat.

[0139] For example, in a use case where there are four seats in a vehicle and signals are sent to passengers sitting in each seat and wearing different headphones, four different signals, E'1(n), E'2(n), E'3(n), and E'4(n), can be sent.

[0140] Therefore, in a vehicle, among the noise cancellation signals to be sent to each wireless headphone, the target output signal output from each speaker that is not recognized as noise can be provided to the passengers sitting in each seat.

[0141] Therefore, various aspects of the present disclosure aim to provide improved noise cancellation performance for an in-vehicle active noise control system.

[0142] In addition, while eliminating unnecessary noise in the vehicle, necessary sounds can be provided to the passengers.

[0143] In addition, noise cancellation performance optimized for each seat in the vehicle can be exhibited.

[0144] In addition, by providing an operation algorithm, an improved human-machine interface can be provided, and the operation algorithm can cooperate and intelligently operate with the vehicle system when a passenger wears a wireless headphone and sits in the vehicle.

[0145] Meanwhile, the present disclosure described above can be implemented as computer-readable code on a medium recording a program. The computer-readable medium includes various storage devices for storing data readable by a computer system. Examples of the computer-readable medium include a hard disk drive (HDD), a solid state drive (SSD), a silicon disk drive (SDD), a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device. Accordingly, it should be understood that the detailed description is illustrative in every aspect and not restrictive. The scope of the present disclosure should be determined based on a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present disclosure fall within the scope of the present disclosure.

[0146] In addition, terms related to a control device, such as "controller", "control device", "control unit", "control equipment", "control module", or "server", refer to a hardware device including a memory and a processor configured to execute one or more steps interpreted as an algorithm structure. The memory stores the algorithm steps, and the processor executes the algorithm steps to perform one or more processes of the method according to various exemplary embodiments of the present disclosure. The control device according to an exemplary embodiment of the present disclosure can be implemented by a non-volatile memory configured to store an algorithm for controlling operations of various components of a vehicle or data on software instructions for executing the algorithm, and a processor configured to perform the above operations using the data stored in the memory. The memory and the processor can be separate chips. Alternatively, the memory and the processor can be integrated in a single chip. The processor can be implemented as one or more processors. The processor can include various logic circuits and arithmetic circuits, can be configured to process data according to a program provided from the memory, and can generate a control signal according to the processing result.

[0147] The control device can be at least one microprocessor operated by a predetermined program, and the predetermined program can include a series of instructions for executing the methods included in the various exemplary embodiments of the present disclosure described above.

[0148] In various exemplary embodiments of the present disclosure, each of the above operations can be performed by a control device, and the control device can be composed of multiple control devices or an integrated single control device.

[0149] In various exemplary embodiments of the present disclosure, the memory and the processor can be provided as one chip or as separate chips.

[0150] In various exemplary embodiments of the present disclosure, the scope of the present disclosure includes software or machine-executable commands (e.g., operating systems, applications, firmware, programs, etc.) that can operate in accordance with the methods of the various embodiments to be executed on a device or computer, including a non-transitory computer-readable medium storing such software or commands and executable on the device or computer.

[0151] In various exemplary embodiments of the present disclosure, the control device may be implemented in the form of hardware or software, or may be implemented as a combination of hardware and software.

[0152] In addition, terms such as "unit" and "module" included in the specification refer to units for processing at least one function or operation, which may be implemented by hardware, software, or a combination thereof.

[0153] In an exemplary embodiment of the present disclosure, a vehicle may be referred to as being based on a concept including various means of transportation. In some use cases, a vehicle may be interpreted as being based on a concept that includes not only various land-based means of transportation traveling on roads, such as cars, motorcycles, trucks, and buses, but also various means of transportation such as airplanes, drones, and ships.

[0154] For the sake of facilitating explanation and precise definition of the appended claims, terms such as "upper", "lower", "inner", "outer", "above", "below", "upward", "downward", "front", "rear", "back", "inside", "outside", "inward", "outward", "inner side", "outer side", "internal", "external", "inner part", "outer part", "forward", "backward" are used to describe the features of the exemplary embodiments with reference to the positions of these features shown in the accompanying drawings. It will be further understood that the term "connected" or its derivatives refer to direct and indirect connections.

[0155] The term "and / or" includes combinations of multiple related listed items or any of the multiple related listed items. For example, "A and / or B" includes all three use cases, such as "A", "B", and "A and B".

[0156] In an exemplary embodiment of the present disclosure, "at least one of A and B" may refer to "at least one of A or B" or "at least one of the combinations of at least one of A and B". In addition, "one or more of A and B" may refer to "one or more of A or B" or "one or more of the combinations of one or more of A and B".

[0157] In this specification, unless otherwise stated, singular expressions include plural expressions, unless the context clearly indicates otherwise.

[0158] In an exemplary embodiment of the present disclosure, it should be understood that terms such as "including" or "having" are intended to specify the presence of features, numbers, steps, operations, elements, components, or combinations thereof described in the specification, and do not exclude the possibility of adding or existing one or more other features, numbers, steps, operations, elements, components, or combinations thereof.

[0159] According to an exemplary embodiment of the present disclosure, the components may be combined with each other to be implemented as one, or some components may be omitted.

[0160] The foregoing description of specific exemplary embodiments of the present disclosure has been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the present disclosure to the exact forms disclosed, and obviously many modifications and variations are possible in light of the above teachings. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable others skilled in the art to utilize the various exemplary embodiments of the present disclosure as well as its various alternatives and modifications. The scope of the present disclosure is intended to be defined by the appended claims and their equivalents.

Claims

1. An active noise control method for a vehicle, the active noise control method comprising the following steps: receiving, by a head unit, a noise signal detected by at least one wireless headset, the at least one wireless headset being operably connected to the head unit in the vehicle; generating, by an amplifier (AMP) controller, a target output signal corresponding to a sound to be provided to an occupant of the vehicle; generating, by an acoustic design processor (ADP) controller operatively connected to the amplifier (AMP) controller, a phase signal opposite to a signal obtained by subtracting the target output signal from the noise signal; as well as The generated opposite phase signal is transmitted by the head unit to the at least one wireless headset, and sound including the generated opposite phase signal is provided.

2. The active noise control method according to claim 1, further comprising the following steps: The target output signal is sent to the speaker by the AMP controller.

3. The active noise control method according to claim 2, in, The speakers are multiple, and The target output signal includes a plurality of different target output signals to be sent to seats in the vehicle, and the different target output signals are sent to speakers respectively corresponding to the seats.

4. The active noise control method according to claim 1, further comprising the following steps: The noise signal is received by the AMP controller from the head unit.

5. The active noise control method according to claim 1, further comprising the following steps: The ADP controller receives information about acceleration from an acceleration sensor and applies the acceleration information to the noise signal.

6. The active noise control method according to claim 1, wherein: Transmitting the generated opposite phase signal to the at least one wireless headset includes transmitting a phase signal opposite to the noise signal detected by the at least one wireless headset corresponding to each seat to the at least one wireless headset corresponding to each seat.

7. The active noise control method according to claim 2, wherein: The target output signal includes at least one of an alarm sound, a navigation notification sound, a sound source in the vehicle, and a combination thereof.

8. An active noise control system for a vehicle, the active noise control system comprising: a head unit configured to: receive a noise signal detected by at least one wireless headset operably connected to the head unit in the vehicle; an amplifier (AMP) controller operably connected to the head unit and configured to: generate a target output signal corresponding to sound to be provided to an occupant of the vehicle; as well as an acoustic design processor (ADP) controller operably connected to the amplifier (AMP) controller and configured to: generate a phase signal opposite to a signal obtained by subtracting the target output signal from the noise signal, The head unit transmits the generated opposite phase signal to at least one wireless headset and provides sound including the generated opposite phase signal.

9. The active noise control system according to claim 8, wherein: The AMP controller is also configured to send the target output signal to a speaker.

10. The active noise control system according to claim 9, in, The speakers are multiple, and The target output signal includes a plurality of different target output signals to be sent to seats in the vehicle, and the different target output signals are sent to speakers respectively corresponding to the seats.

11. The active noise control system according to claim 8, wherein: The AMP controller is also configured to receive the noise signal from the head unit.

12. The active noise control system according to claim 8, wherein: The ADP controller is further configured to receive information about acceleration from an acceleration sensor and apply the information about the acceleration to the noise signal.

13. The active noise control system according to claim 8, wherein: The head unit transmits a phase signal opposite to the noise signal detected by the at least one wireless headset corresponding to each seat to the at least one wireless headset corresponding to each seat.

14. The active noise control system according to claim 9, wherein: The target output signal includes at least one of an alarm sound, a navigation notification sound, a sound source in the vehicle, and a combination thereof.

15. An active noise control system for a vehicle, the active noise control system comprising: processor; as well as a non-transitory storage medium containing program instructions, The processor is configured to: receiving a noise signal detected by at least one wireless headset in the vehicle; generating a target output signal corresponding to a sound to be provided to an occupant of the vehicle; and generating a phase signal opposite to a signal obtained by subtracting the target output signal from the noise signal, The generated bit signal of opposite phase is transmitted to at least one wireless headset, and sound including the generated bit signal of opposite phase is provided.

16. The active noise control system according to claim 15, wherein: The processor is further configured to send the target output signal to a speaker.

17. The active noise control system according to claim 16, in, The speakers are multiple, and The target output signal includes a plurality of different target output signals to be sent to seats in the vehicle, and the different target output signals are sent to speakers respectively corresponding to the seats.

18. The active noise control system of claim 15, wherein: The processor is further configured to receive information about acceleration from an acceleration sensor and apply the information about the acceleration to the noise signal.

19. The active noise control system of claim 15, wherein: The target output signal includes at least one of an alarm sound, a navigation notification sound, a sound source in the vehicle, and a combination thereof.

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