Apparatus and method for cancelling noise signal, non-transitory computer readable medium

Abstract

The invention relates to an apparatus and a method for cancelling a noise signal, and a non-transitory computer readable medium. An apparatus for cancelling a noise signal may include a sensor configured to detect noise outside a vehicle and generate a noise signal associated with the detected noise. The apparatus may also include a first noise cancelling circuit to generate a first noise cancelling signal of the first frequency band and a second noise cancelling circuit to generate a second noise cancelling signal of the second frequency band. One or more processors, along with a memory storing instructions, may control a first noise cancellation circuit to perform noise cancellation on a first noise signal in a first frequency band. Upon determining that the vehicle has entered the enclosed space, the second noise cancellation circuit may perform a second noise cancellation operation on a second noise signal in a second frequency band. The second frequency band corresponds to noise generated when the vehicle is within the enclosed space.

Description

Technical Field

[0001] The present disclosure relates to technology for actively controlling noise that occurs while driving a vehicle, and more particularly, to a system and method for actively controlling not only noise that occurs due to vehicle contact with the ground (road noise) but also noise that occurs during driving in an enclosed space (e.g., a tunnel) (in-tunnel noise), and a vehicle including the system. Background Art

[0002] The matters described in this background section are only for enhancing understanding of the background of the present disclosure and should not be regarded as admissions that they correspond to the prior arts known to those skilled in the art.

[0003] When driving a vehicle, noise (hereinafter referred to as road noise or pavement noise) is generated due to the contact (or friction) between the vehicle and the road surface. This noise not only causes stress to the driver but also distracts the driver, potentially causing accidents. Furthermore, road noise can make it difficult for passengers to watch movies, listen to music, or talk on the phone while in the vehicle.

[0004] Therefore, various studies are being conducted on technologies related to active noise control / cancellation (ANC).

[0005] If you drive a vehicle, you may encounter many tunnels and long tunnels on the road. Not only does this generate high noise (tunnel noise), but the semi-enclosed space characteristics of the tunnel also form a reflected sound field in the enclosed space (such as the tunnel), causing audio distortion.

[0006] Therefore, in the study of vehicle-related active noise control, it may be useful to consider the control of noise inside tunnels. Summary of the Invention

[0007] According to the present disclosure, a device for canceling a noise signal may include a sensor configured to detect noise outside a vehicle and generate a noise signal, wherein the noise signal is associated with the noise outside the vehicle; a first noise cancellation circuit, the first noise cancellation circuit being configured to generate a first noise cancellation signal associated with a first frequency band; a second noise cancellation circuit, the second noise cancellation circuit being configured to generate a second noise cancellation signal associated with a second frequency band; one or more processors and a memory storing instructions, which, when executed by the one or more processors, cause the device to control the first noise cancellation circuit to perform a first noise cancellation operation on the first noise signal, the noise signal being in the first frequency band, and based on determining that the vehicle has entered an enclosed space, control the second noise cancellation circuit to perform a second noise cancellation operation on the second noise signal, the noise signal being in the second frequency band, wherein the second frequency band is associated with a portion of the noise detected to be generated when the vehicle is within the enclosed space.

[0008] The apparatus may include a first frequency band for road noise and a second frequency band for noise within an enclosed space.

[0009] The device, wherein the first frequency band may include a first frequency range from 0 to 599 Hz, and the second frequency band may include a second frequency range from 601 to 3000 Hz.

[0010] A device, wherein when executed by one or more processors, the instructions further cause the device to: determine, based on the enclosed space entry information, a first noise level before a vehicle enters the enclosed space and a second noise level after the vehicle enters the enclosed space; and control a first noise cancellation operation and a second noise cancellation operation based on a difference between the first noise level and the second noise level.

[0011] A device, wherein the enclosed space entry information may sequentially include enclosed space entry expectation information, enclosed space entry start information, and enclosed space entry completion information, wherein the instructions, when executed by the one or more processors, further cause the device to: determine a first level of a first noise signal input between a time when the enclosed space entry expectation information is received and a time when the enclosed space entry start information is received, and determine a second level of a second noise signal input between a time when the enclosed space entry start information is received and a time when the enclosed space entry completion information is received.

[0012] The device, wherein the instructions, when executed by the one or more processors, further cause the device to output compensation level information based on a difference between the first noise level and the second noise level, output a first noise cancellation sound based on the compensation level information, and output a second noise cancellation sound based on the compensation level information.

[0013] The device, wherein the instructions, when executed by the one or more processors, further cause the device to output upward compensation level information based on the second noise level being higher than the first noise level, and to output downward compensation level information based on the second noise level being lower than the first noise level.

[0014] A device, wherein the instructions, when executed by one or more processors, further cause the device to perform a noise cancellation operation by outputting a noise cancellation sound, wherein the noise cancellation sound may include a phase that is anti-phase relative to a noise signal to be cancelled, changing a level of the noise cancellation sound based on compensation level information, and outputting the noise cancellation sound of the changed level.

[0015] According to the present disclosure, a method performed by a device for canceling a noise signal may include: generating noise based on a sensor of the device that detects noise outside a vehicle; a noise signal; generating, by a first noise cancellation circuit of the device, a first noise cancellation signal associated with a first frequency band; performing, by the first noise cancellation circuit of the device, a first noise cancellation operation on the first noise signal in the first frequency band, a second noise cancellation signal associated with a second frequency band, based on a determination that the vehicle has entered an enclosed space; and performing, by the second noise cancellation circuit of the device, a second noise cancellation operation on the second noise signal in the second frequency band, based on a determination that the vehicle has entered the enclosed space; the second frequency band being associated with a portion of the noise detected to be generated when the vehicle is within the enclosed space.

[0016] The method, wherein the first frequency band may include a frequency band for road noise, and the second frequency band may include a frequency band for noise within an enclosed space.

[0017] The method may further include determining a first noise level before the vehicle enters the enclosed space and a second noise level after the vehicle enters the enclosed space based on the enclosed space entry information, and controlling the first noise cancellation operation and the second noise cancellation operation based on a difference between the first noise level and the second noise level.

[0018] The method, wherein the enclosed space entry information may sequentially include enclosed space entry expectation information, enclosed space entry start information, and enclosed space entry completion information, wherein determining a first noise level before a vehicle enters the enclosed space and a second noise level after the vehicle enters the enclosed space may include: determining a first level of a first noise signal input between a time of receiving the enclosed space entry expectation information and a time of receiving the enclosed space entry start information, and determining a second level of a second noise signal input between a time of receiving the enclosed space entry start information and a time of receiving the enclosed space entry completion information.

[0019] The method, wherein controlling the first noise cancellation operation and the second noise cancellation operation may include outputting compensation level information based on a difference between the first noise level and the second noise level, and changing a level of the output noise cancellation sound based on the compensation level information.

[0020] The method, wherein controlling the first and second noise cancellation operations may include outputting upward compensation level information based on the second noise level being higher than the first noise level, and outputting downward compensation level information based on the second noise level being lower than the first noise level.

[0021] The method, wherein performing a first noise cancellation operation may include outputting a first noise cancellation sound, wherein the first noise cancellation sound may include an inverted phase relative to a first noise signal in a first frequency band, and wherein performing a second noise cancellation operation may include outputting a second noise cancellation sound, wherein the second noise cancellation sound may include an inverted phase relative to a second noise signal in a second frequency band, may also include outputting the first noise cancellation sound and the second noise cancellation sound by changing a first level of the first noise cancellation sound and a second level of the second noise cancellation sound based on compensation level information.

[0022] According to the present disclosure, a non-transitory computer-readable medium storing instructions for canceling a noise signal, when executed, causes a sensor of a device to detect noise outside a vehicle and generate a noise signal, wherein the noise signal is associated with noise outside the vehicle; a first noise cancellation circuit of the device to perform a first noise cancellation operation on the first noise signal, placing the noise signal in a first frequency band, and generating a first noise cancellation signal associated with the first frequency band; and a second noise cancellation circuit of the device to perform, based on a determination that the vehicle has entered an enclosed space, a second noise cancellation operation on a second noise signal in a second frequency band, and generate a second noise cancellation signal associated with the second frequency band, wherein the second frequency band is associated with a portion of the noise generated when the vehicle is within the enclosed space.

[0023] The non-transitory computer-readable medium may include a first frequency band for road noise and a second frequency band for noise within an enclosed space.

[0024] A non-transitory computer-readable medium, wherein the instructions, when executed, cause a device to: determine, based on the enclosed space entry information, a first noise level before a vehicle enters the enclosed space and a second noise level after the vehicle enters the enclosed space, and control a first noise cancellation operation and a second noise cancellation operation based on a difference between the first noise level and the second noise level.

[0025] A non-transitory computer-readable medium, wherein the enclosed space entry information may sequentially include enclosed space entry expectation information, enclosed space entry start information, and enclosed space entry completion information, wherein the instructions, when executed, cause the device to determine a first noise level before a vehicle enters an enclosed space and a second noise level after the vehicle enters the enclosed space by determining a first level of a first noise signal input between a time when the enclosed space entry expectation information is received and a time when the enclosed space entry start information is received, and determining a second level of a second noise signal input between a time when the enclosed space entry start information is received and a time when the enclosed space entry completion information is received.

[0026] A non-transitory computer-readable medium, wherein when the instructions are executed, causes a device to control first and second noise cancellation operations by outputting compensation level information based on a difference between the first and second noise levels and changing a level of output noise cancellation sound based on the compensation level information. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are intended to help understand the examples of the present disclosure and provide examples together with the detailed description. However, the technical features of the examples are not limited to specific drawings, and the features disclosed in the corresponding drawings can be combined to form new examples.

[0028] Figure 1 One example of a vehicle 1 including an active noise control system 100 according to one example of the present disclosure is shown;

[0029] Figure 2 shows an example of a configuration of an active noise control system 100 according to an example of the present disclosure; and

[0030] Figure 3 An example of an active noise control method according to an example of the present disclosure is shown. DETAILED DESCRIPTION

[0031] The advantages and features of the present disclosure and the manner in which they are achieved will become apparent by reference to the examples described in detail below in conjunction with the accompanying drawings. However, the present disclosure is not limited to the examples set forth below, but may be implemented in a variety of different forms. The following examples are provided solely to fully illustrate the present disclosure and to inform those skilled in the art of the scope of the present disclosure, and the present disclosure is limited only by the scope of the appended claims.

[0032] The shapes, sizes, ratios, angles and numbers of the examples disclosed in the drawings for illustrating the present disclosure are provided only by way of example, and therefore, the present disclosure is not limited to those shown in the drawings. Throughout the specification, the same or similar reference numerals represent the same or similar elements. In addition, when describing the present disclosure, if it is determined that a detailed description of the known related art unnecessarily obscures the subject matter of the present disclosure, the detailed description will be omitted. In the case of the expressions "including", "having" and "comprising" mentioned in the specification, another part may be added unless the term "only" is used. Elements expressed in the singular may include plural forms unless otherwise expressly indicated.

[0033] When interpreting an element, the element should be interpreted as covering an error range even though that error range is not explicitly described.

[0034] When describing a temporal relationship, if terms such as "after," "after," "immediately," or "before" are used to describe the temporal order, the temporal order may include discontinuous cases unless the terms "just" or "immediately" are used.

[0035] The terms "first," "second," etc. may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from other elements. Therefore, without departing from the spirit of this disclosure, the first element used in the following description may be the second element.

[0036] When describing elements of the present disclosure, terms such as "first," "second," "A," "B," "(a)," and "(b)" may be used. These terms are used only to distinguish corresponding elements from other elements, and the nature, order, sequence, or number of the corresponding elements are not limited by these terms. It will be understood that if an element is referred to as being "connected to" or "coupled to" another element, the element may be directly connected to or coupled to the other element, but another element may be interposed between the corresponding elements that may be indirectly connected or coupled to each other.

[0037] The term "at least one" should be understood to include any and all combinations of one or more of the listed related elements. For example, "at least one of a first element, a second element, and a third element" may refer not only to the first element, the second element, or the third element, but also to all combinations of two or more of the first element, the second element, and the third element.

[0038] The corresponding features of the various examples of the present disclosure may be partially or completely coupled or combined with each other, and may be technically linked and interoperable with each other in various ways, and the various examples of the present disclosure may be executed independently of each other or may be executed in association with each other.

[0039] For convenience of description, the scale of elements shown in the drawings may be different from the actual scale, and thus, the elements are not limited to the scale shown in the drawings.

[0040] Hereinafter, an active noise control system, an active noise control method, and a vehicle including the active noise control system according to examples of the present disclosure will be described with reference to the accompanying drawings.

[0041] Figure 1 One example of a vehicle 1 including an active noise control system 100 according to one example of the present disclosure is shown.

[0042] refer to Figure 1 , the vehicle 1 may include an active noise control system 100 according to one example of the present disclosure.

[0043] Furthermore, the vehicle 1 may include a sound sensor 200 (e.g., a micro-electromechanical system microphone, an electret condenser microphone, a piezoelectric microphone, or a sound level meter) and an information providing device 300. The sound sensor 200 provides a noise signal corresponding to noise input from outside the vehicle 1 to the active noise control system 100, and the information providing device 300 outputs tunnel entry information to the active noise control (ANC) system 100. The ANC system 100 may capture ambient noise around the user (e.g., the hum of an engine or vibrations in a crowded room), process the captured ambient noise to create an inverse sound wave (e.g., anti-noise) that matches the frequency of the ambient noise, and play the anti-noise to cancel the ambient noise.

[0044] The active noise control system 100 may generate a first noise cancellation signal having an inverted phase with respect to a noise signal in a first frequency band preset to cancel road noise, from among the noise signals input from the sound sensor 200, and may output a sound (a first noise cancellation sound) corresponding to the generated first noise cancellation signal (a road noise cancellation operation or a first noise cancellation operation).

[0045] For example, the active noise control system 100 may perform road noise cancellation operations based on known feed-forward active noise control / cancellation (feed-forward ANC) algorithms.

[0046] The active noise control system 100 may generate a second noise cancellation signal having an inverted phase relative to a noise signal in a second frequency band preset to cancel in-tunnel noise, from the noise signal input from the sound sensor 200, and may output a sound (second noise cancellation sound) corresponding to the generated second noise cancellation signal (in-tunnel noise cancellation operation or second noise cancellation operation).

[0047] For example, the active noise control system 100 may perform in-tunnel noise cancellation operations based on known feedback active noise control / cancellation (feedback ANC) algorithms.

[0048] According to an example, the first frequency band may include a frequency band related to road noise, and the second frequency band may include a frequency band related to tunnel noise. For example, the first frequency band may be a bass band, and the second frequency band may be a mid-range band. For example, the bass band may be 0 to 600 Hz, and the mid-range band may be 600 to 3000 Hz, but the bass band and the mid-range band are not limited to this example.

[0049] For example, the low frequency band may be set based on an analysis of road noise obtained through a vehicle driving test, and the mid-frequency band may be set based on an analysis of in-tunnel noise obtained through a vehicle driving test.

[0050] According to an example, the active noise control system 100 may perform the road noise cancellation operation regardless of whether the tunnel entry information provided from the information providing device 300 is received. According to an example, when the tunnel entry information is received from the information providing device 300, the active noise control system 100 may perform the in-tunnel noise cancellation operation.

[0051] That is, the active noise control system 100 may perform a road noise cancellation operation if the vehicle 1 is inside a tunnel and may perform an in-tunnel noise cancellation operation if the vehicle 1 is outside a tunnel, and may perform an in-tunnel noise cancellation operation if the vehicle 1 enters a tunnel.

[0052] When receiving the tunnel entry information from the information providing device 300 , the active noise control system 100 may determine the level of the noise signal.

[0053] For example, the tunnel entry information may include multiple pieces of information related to tunnel entry. For example, the tunnel entry information may include tunnel entry expectation information provided if the vehicle 1 reaches a preset distance before entering the tunnel, tunnel entry start information provided if the vehicle 1 passes through the entrance of the tunnel, tunnel entry completion information provided if the vehicle 1 reaches a preset distance after entering the tunnel, and tunnel passing completion information provided if the vehicle 1 completely passes through the tunnel.

[0054] For example, the active noise control system 100 may determine the level (e.g., 70 dB to 140 dB) of a noise signal input between the time when the tunnel entry expectation information is received and the time when the tunnel entry start information is received. For example, the active noise control system 100 may determine the average value of the level of the noise signal input between the time when the tunnel entry expectation information is received and the time when the tunnel entry start information is received.

[0055] That is, the active noise control system 100 may determine the level of one noise signal among the noise signals before entering the tunnel, or may determine an average value of the levels of a plurality of noise signals.

[0056] For example, the active noise control system 100 may determine the level of a noise signal input between the time when the tunnel entry start information is received and the time when the tunnel entry completion information is received (the noise signal after entering the tunnel). For example, the active noise control system 100 may determine the average value of the level of the noise signal input between the time when the tunnel entry start information is received and the time when the tunnel entry completion information is received.

[0057] That is, the active noise control system 100 may determine the level of one noise signal among the noise signals after entering the tunnel, or may determine an average value of the levels of a plurality of noise signals.

[0058] As described above, the active noise control system 100 may determine the level or average level of the noise signal before and after entering the tunnel.

[0059] According to an example, the active noise control system 100 may determine the compensation level based on the level or average level of the noise signal before and after entering the tunnel.

[0060] The active noise control system 100 may compensate for the level of the first noise cancellation sound to output the first noise cancellation sound or compensate for the level of the second noise cancellation sound to output the second noise cancellation sound based on the determined compensation level.

[0061] For example, the active noise control system 100 may determine the compensation level by subtracting the level of the noise signal after entering the tunnel from the level of the noise signal before entering the tunnel. The active noise control system 100 may determine the compensation level by subtracting the level of the noise signal after entering the tunnel from the average level of the noise signal before entering the tunnel.

[0062] For example, if the determined compensation level is a positive (+) value, the active noise control system 100 may increase the level of the first noise cancellation sound or the second noise cancellation sound by the compensation level. If the determined compensation level is a negative (-) value, the active noise control system 100 may decrease the level of the first noise cancellation sound or the second noise cancellation sound by the compensation level.

[0063] The sound sensor 200 according to an example may be installed in the vehicle 1 (e.g., a side mirror, under the hood, on the roof, near a wheel well, or on the rear bumper of the vehicle 1 ), and may provide noise input from outside the vehicle 1 to the active noise control system 100 .

[0064] The installation position of the sound sensor 200 is not limited. For example, the sound sensor 200 can be installed in the vehicle 1 to effectively obtain noise outside the vehicle.

[0065] For example, the sound sensor 200 may include a microphone (or mike), a micro-electromechanical system (MEMS) type acceleration sensor, etc., but the configuration of the sound sensor 200 is not limited thereto.

[0066] The information providing device 300 according to an example may provide information related to tunnel entry to the active noise control system 100 .

[0067] For example, the information providing device 300 may be a speaker host, but is not limited to this type of speaker host. The information providing device 300 may be any device installed in the vehicle 1 to provide information related to tunnel entry.

[0068] The information providing device 300 may provide the tunnel entry information to the active noise control system 100 according to preset settings.

[0069] According to an example, if the vehicle 1 reaches a preset distance before entering a tunnel (for example, 10 meters before entering the tunnel), the information providing device 300 may provide tunnel entry desired information to the active noise control system 100. For example, the tunnel entry desired information may be a signal of a preset first level.

[0070] According to an example, if the vehicle 1 passes through the entrance of a tunnel, the information providing device 300 may provide tunnel entry start information to the active noise control system 100. For example, the tunnel entry start information may be a signal having a preset second level.

[0071] For example, the vehicle 1 passing through the tunnel entrance may refer to a case where the front bumper of the vehicle 1 passes through the tunnel entrance or a case where the entire vehicle 1 passes through the tunnel entrance, and the case of determining that the vehicle 1 passes through the tunnel entrance is not limited thereto.

[0072] According to an example, if the vehicle 1 reaches a preset distance after entering the tunnel (for example, 10 meters after entering the tunnel), the information providing device 300 may provide tunnel entry completion information to the active noise control system 100. For example, the tunnel entry completion information may be a signal having a preset third level.

[0073] According to an example, if the vehicle 1 has completely passed through the tunnel, the information providing device 300 may provide tunnel passing completion information to the active noise control system 100. For example, the tunnel passing completion information may be a signal having a preset fourth level.

[0074] According to an example, the vehicle 1 may include an operation control device 400 for controlling the start and end of the operation of the active noise control system 100. For example, the operation control device 400 may output an operation start signal or an operation end signal to the active noise control system 100. For example, the operation control device 400 may output an ignition-on signal as the operation start signal or an ignition-off signal as the operation end signal to the active noise control system 100.

[0075] According to an example, the vehicle 1 may include a user interface 500 (eg, a touch screen-like graphical user interface (GUI)) for controlling the start of execution of the noise compensation function of the active noise control system 100 .

[0076] For example, the user interface 500 may receive an input from the user regarding whether the noise compensation function is activated and output a noise compensation function activation signal to the active noise control system 100 , thereby enabling the active noise control system 100 to perform the noise compensation function.

[0077] Figure 2 An example of a configuration of an active noise control system 100 according to an example of the present disclosure is shown.

[0078] Reference Figure 1 and Figure 2 The active noise control system 100 according to an example of the present disclosure may include a first noise cancellation module (or road noise cancellation module) 110, a second noise cancellation module (or tunnel noise cancellation module), and a control module 130, but the configuration of the active noise control system 100 is not limited thereto.

[0079] The first noise cancellation module 110 may generate a first noise cancellation signal having an opposite phase with respect to a noise signal in a first frequency band preset to cancel road noise in the noise signal, and may output a sound (first noise cancellation sound) corresponding to the generated first noise cancellation signal (road noise cancellation operation or first noise cancellation operation).

[0080] For example, the first noise cancellation module 110 may perform road noise cancellation operations based on a known feed-forward active noise control / cancellation (feed-forward ANC) algorithm.

[0081] The first noise cancellation module 110 may change the level of the first noise cancellation sound according to the control of the control module 130 and output the first noise cancellation sound.

[0082] The first noise cancellation module 110 may start the road noise cancellation operation upon receiving an operation start signal from the control module 130 , and may end the road noise cancellation operation upon receiving an operation stop signal from the control module 130 .

[0083] According to an example, the first noise removal module 110 may include a first noise analysis module 111 and a first sound output module 112 .

[0084] The first noise analysis module 111 can perform frequency analysis on the input noise signal and generate a first noise cancellation signal for the noise signal in a preset first frequency band in the noise signal. The first noise cancellation signal has an opposite phase to the noise signal in the first frequency band.

[0085] In an example, the first noise analysis module 111 may be a component that generates and outputs a first noise cancellation signal for canceling road noise, and the first frequency band may be a bass band and may be set based on frequency analysis of road noise obtained through a vehicle driving test.

[0086] The first noise analysis module 111 may generate a first noise cancellation signal having an opposite phase with respect to the noise signal in the first frequency band, and may output the first noise cancellation signal to the first sound output module 112 .

[0087] The first sound output module 112 may receive the first noise cancellation signal output from the first noise analysis module 111 and may output a sound (first noise cancellation sound) corresponding to the first noise cancellation signal.

[0088] The first sound output module 112 may change the level of the first noise cancellation sound based on the compensation level information output from the control module 130 and may output the first noise cancellation sound having the changed level.

[0089] For example, the first sound output module 112 may include a speaker suitable for outputting low-frequency sounds. For example, the speaker may include a subwoofer, but the configuration of the first sound output module 112 is not limited thereto.

[0090] The second noise cancellation module 120 may perform a tunnel noise cancellation operation (or a second noise cancellation operation) under the control of the control module 130. For example, upon receiving an operation-on signal from the control module 130, the second noise cancellation module 120 may perform the tunnel noise cancellation operation. For example, upon receiving an operation-off signal from the control module 130, the second noise cancellation module 120 may terminate the tunnel noise cancellation operation.

[0091] The second noise cancellation module 120 may generate a second noise cancellation signal in an inverted phase with respect to a noise signal in a second frequency band, wherein the noise signal in the second frequency band is preset to cancel tunnel noise in the noise signal, and the second noise cancellation module 120 may output a sound (second noise cancellation sound) corresponding to the generated second noise cancellation signal (in-tunnel noise cancellation operation).

[0092] For example, the second noise cancellation module 120 may perform an in-tunnel noise cancellation operation based on a known feedback active noise control / cancellation (feedback ANC) algorithm.

[0093] The second noise cancellation module 120 may change the level of the second noise cancellation sound according to the control of the control module 130 and output the second noise cancellation sound.

[0094] According to an example, the second noise removal module 120 may include a second noise analysis module 121 and a second sound output module 122 .

[0095] The second noise analysis module 121 can perform frequency analysis on the input noise signal and generate a second noise cancellation signal for the noise signal in a preset second frequency band in the noise signal. The second noise cancellation signal has an opposite phase to the noise signal in the second frequency band.

[0096] In an example, the second noise analysis module 121 may be a component that generates and outputs a second noise cancellation signal to cancel tunnel noise, and the second frequency band may be a mid-sound frequency band and may be set based on frequency analysis of tunnel noise obtained through a vehicle driving test.

[0097] The second noise analysis module 121 may generate a second noise cancellation signal having an opposite phase with respect to the noise signal in the second frequency band, and may output the second noise cancellation signal to the second sound output module 122 .

[0098] The second sound output module 122 may receive the second noise cancellation signal output from the second noise analysis module 121 and may output a sound (a second noise cancellation sound) corresponding to the second noise cancellation signal.

[0099] The second sound output module 122 may change the level of the second noise cancellation sound based on the compensation level information output from the control module 130 and may output the second noise cancellation sound having the changed level.

[0100] For example, the second sound output module 122 may include a speaker suitable for outputting mid-frequency sounds. For example, the speaker may include a mid-range speaker, but the configuration of the second sound output module 122 is not limited thereto.

[0101] The control module 130 may control the first noise cancellation module 110 to perform the noise cancellation operation when the vehicle 1 is inside the tunnel and when the vehicle 1 is outside the tunnel, and may control the second noise cancellation module 120 to perform the noise cancellation operation only when the vehicle 1 enters the tunnel.

[0102] The control module 130 may control the start and end of the operation of the first noise cancellation module 110 based on an operation start signal or an operation end signal provided from the operation control device 400 .

[0103] According to an example, when an operation start signal is received from the operation control device 400, the control module 130 may output an operation on signal to the first noise cancellation module 110, and when an operation end signal is received from the operation control device 400, the control module 130 may output an operation off signal to the first noise cancellation module 110.

[0104] The control module 130 may control the first noise cancellation module 110 and the second noise cancellation module 120 based on the tunnel entry information provided from the information providing device 300 .

[0105] For example, when receiving a noise compensation function activation signal output from the user interface 500 , the control module 130 may perform the noise compensation function based on the tunnel entry information.

[0106] The control module 130 may provide tunnel entry desire information, tunnel entry start information, tunnel entry completion information, and tunnel passage completion information from the information providing apparatus 300 as the tunnel entry information.

[0107] The control module 130 may control the start and end of the operation of the second noise cancellation module 120 based on the tunnel entry desire information and the tunnel pass completion information.

[0108] According to an example, upon receiving the tunnel entry expectation information, the control module 130 may output a start operation signal to the second noise cancellation module 120 to control the start of the operation of the second noise cancellation module 120 .

[0109] When receiving the tunnel passage completion information, the control module 130 may output an operation signal to the second noise cancellation module 120 to control the end of the operation of the second noise cancellation module 120 .

[0110] When receiving the tunnel entry information, the control module 130 may determine the noise levels before and after entering the tunnel, and may determine the compensation level based on the noise levels before and after entering the tunnel.

[0111] According to an example, the control module 130 may determine a level of a noise signal (a noise signal before entering the tunnel) input between the time of receiving the tunnel entry desire information and the time of receiving the tunnel entry start information.

[0112] For example, the control module 130 may determine the level of one noise signal among the noise signals before entering the tunnel, or may determine an average value of the levels of a plurality of noise signals.

[0113] According to an example, the control module 130 may determine a level of a noise signal (a noise signal after entering a tunnel) input between a time of receiving the tunnel entry start information and a time of receiving the tunnel entry completion information.

[0114] For example, the control module 130 may determine the level of one noise signal among the noise signals after entering the tunnel, or may determine an average value of the levels of a plurality of noise signals.

[0115] As described above, the control module 130 may determine the level or average level of the noise signal before and after entering the tunnel.

[0116] The control module 130 may determine the compensation level based on the level or average level of the noise signal before and after entering the tunnel.

[0117] For example, the control module 130 may determine the compensation level by subtracting the level of the noise signal after entering the tunnel from the level of the noise signal before entering the tunnel. Alternatively, the control module 130 may determine the compensation level by subtracting the level of the noise signal after entering the tunnel from the average level of the noise signal before entering the tunnel.

[0118] The method by which the control module 130 determines the compensation level is not limited thereto. For example, the control module 130 may determine the compensation level by subtracting the noise signal level (or average level) before entering the tunnel from the noise signal level (or average level) after entering the tunnel.

[0119] The control module 130 may control the first noise cancellation module 110 and the second noise cancellation module 120 based on the compensation level information.

[0120] According to an example, the control module 130 may output the compensation level information to the first sound output module 112 of the first noise cancellation module 110 so that the first sound output module 112 outputs the first noise cancellation sound by changing the level of the first noise cancellation sound.

[0121] The control module 130 may output the compensation level information to the second sound output module 122 of the second noise cancellation module 120 so that the second sound output module 122 outputs the second noise cancellation sound by changing the level of the second noise cancellation sound.

[0122] According to an example, if the level (or average level) of the noise signal after entering the tunnel increases compared to the level (or average level) of the noise signal before entering the tunnel, the control module 130 may output upward compensation level information corresponding to the increased amount of the level to the first sound output module 112 and the second sound output module 122.

[0123] If the level (or average level) of the noise signal after entering the tunnel decreases compared to the level (or average level) of the noise signal before entering the tunnel, the control module 130 may output downward compensation level information corresponding to the amount of decrease in the level to the first sound output module 112 and the second sound output module 122.

[0124] For example, the control module 130 may include a module connected to the sound sensor 200 to receive noise ("input module"), a module connected to the information providing device 300 to receive tunnel entry information ("first receiving module"), a module connected to the operation control device 400 to receive operation control signals (including an operation start signal and an operation end signal) ("second receiving module"), a module connected to the user interface 500 to receive a noise compensation function activation signal ("third receiving module"), a memory that stores instructions for the operation of the control module 130 (for example, an active noise control algorithm); and a processor that performs active noise control according to the active noise control algorithm stored in the memory.

[0125] By way of example, an advanced noise cancellation (ANC) system can begin with noise picked up by an active noise control / reduction (ANCR) microphone. This microphone records ambient noise, which is then analyzed through various channels, such as road noise analysis (low frequencies) and tunnel noise analysis (high frequencies). This analysis can involve spectrogram analysis, which can be performed using tools such as MATLAB, Audacity, Praat, Python libraries, WaveSurfer, Adobe Audit, or Sound Imagery to understand the noise characteristics. The ANC system can further process the noise signal using an amplifier (AMP). These processed signals can then be sent to a subwoofer and mid-range / door speakers for noise cancellation at specific frequencies (for example, noise cancellation around 400Hz via the subwoofer and around 3kHz via the mid-range / door speakers). Additionally or alternatively, the ANC system can use a head unit (HU) to collect tunnel information, which is useful for tunnel-specific noise analysis and compensation. When a vehicle enters a tunnel, the HU interacts with the AMP to calculate and adjust the acoustic energy based on tunnel conditions. Processed and compensated sound can be sent to the front speakers, ensuring that the sound level is optimally adjusted for the tunnel environment, maintaining effective noise control even in challenging conditions.

[0126] Figure 3 An example of an active noise control method according to an example of the present disclosure is shown. For convenience, Figure 3 The description is by way of example of steps being performed by a processor (eg, control circuitry). Figure 3 One, some, or all steps of the example methods, or portions thereof, may be performed by one or more other circuits. Figure 3 One or more steps of the example method may be omitted, performed in another order, and / or modified in other ways, and / or one or more additional steps may be added. Alternatively or additionally, Figure 3 Each operation shown in Figure 1 and Figure 2The active noise control system 100 is described as performing.

[0127] Reference Figures 1 to 3 , when receiving the operation start signal ( S300 ), the active noise control system 100 may perform a road noise cancellation operation on the input noise signal ( S310 ).

[0128] In operation S310 , the active noise control system 100 may perform a road noise cancellation operation by using the first noise cancellation module 110 ( S310 ).

[0129] In operation S310, the active noise control system 100 may generate a first noise cancellation signal having an anti-phase with respect to a noise signal in a first frequency band preset to cancel road noise in the noise signal by using the first noise analyzing module 111, and may output a sound (a first noise cancellation sound) corresponding to the generated first noise cancellation signal through the first sound output module 112.

[0130] After operation S310 , the active noise control system 100 may determine whether the vehicle 1 enters a tunnel ( S320 ).

[0131] In operation S320 , the active noise control system 100 may determine whether the vehicle 1 enters a tunnel based on whether tunnel entry information is received from the information providing device 300 .

[0132] As a result of the determination in operation S320 , if it is determined that the vehicle 1 has not entered the tunnel (No in S320 ), that is, if tunnel entry information is not received from the information providing device 300 , the active noise control system 100 may determine whether an operation end signal is received ( S330 ).

[0133] When receiving the operation end signal (YES in S330 ), the active noise control system 100 may end the active noise control operation.

[0134] When the operation end signal is not received (No in S330 ), the active noise control system 100 may perform the road noise cancellation operation according to operation S310 .

[0135] As a result of the determination in operation S320, when it is determined that the vehicle 1 enters the tunnel (Yes in S320), that is, if tunnel entry information (specifically, tunnel entry expectation information) is received from the information providing device 300, the active noise control system 100 may perform a road noise cancellation operation and an in-tunnel noise cancellation operation with respect to the input noise signal (S340).

[0136] In operation S340 , the active noise control system 100 may perform a road noise cancellation operation by using the first noise cancellation module 110 , and may perform an in-tunnel noise cancellation operation by using the second noise cancellation module 120 .

[0137] In operation S340, the active noise control system 100 may generate a first noise cancellation signal having an anti-phase with respect to a noise signal in a first frequency band preset to cancel road noise in the noise signal by using the first noise analyzing module 111, and may output a sound (a first noise cancellation sound) corresponding to the generated first noise cancellation signal through the first sound output module 112.

[0138] Furthermore, the active noise control system 100 can generate a second noise cancellation signal having an anti-phase relative to the noise signal in the second frequency band using the second noise analysis module 121, and output a sound (a second noise cancellation sound) corresponding to the generated second noise cancellation signal through the second sound output module 122. The noise signal in the second frequency band is preset to cancel tunnel noise in the noise signal. Terms such as "device," "unit," and "module" refer to one or more components for processing at least one function or operation, and may be implemented by hardware (e.g., circuitry, circuitry, ASIC), software, or a combination thereof.

[0139] After operation S340 , the active noise control system 100 may determine whether the noise compensation function is activated ( S350 ).

[0140] In operation S350 , the active noise control system 100 may determine whether to activate the noise compensation function based on whether a noise compensation function activation signal is received from the user interface 500 .

[0141] As a result of the determination in operation S350 , if it is determined that the noise compensation function is not activated (No in S350 ), that is, if the noise compensation function activation signal is not received from the user interface 500 , the active noise control system 100 may determine whether the vehicle 1 has passed through a tunnel ( S360 ).

[0142] In operation S360 , the active noise control system 100 may determine whether the vehicle 1 has passed through the tunnel based on whether tunnel entry information (specifically, tunnel passing completion information) is received from the information providing device 300 .

[0143] If the vehicle 1 does not pass through the tunnel (No in S360 ), the active noise control system 100 may perform the road noise cancellation operation and the in-tunnel noise cancellation operation according to operation S340 , and if the vehicle 1 passes through the tunnel (Yes in S360 ), it may determine whether an operation end signal is received according to operation S330 .

[0144] As a result of the determination in operation S350 , if it is determined that the noise compensation function is activated (Yes in S350 ), the active noise control system 100 may determine a compensation level based on noise levels before and after entering the tunnel ( S370 ).

[0145] In operation S370 , the active noise control system 100 may determine a level (or average level) of a noise signal (noise signal before entering the tunnel) input between the time of receiving the tunnel entry desire information and the time of receiving the tunnel entry start information from the information providing device 300 .

[0146] In operation S370 , the active noise control system 100 may determine a level (or average level) of a noise signal (noise signal after entering the tunnel) input between the time of receiving the tunnel entry start information and the time of receiving the tunnel entry completion information from the information providing device 300 .

[0147] In operation S370 , the active noise control system 100 may determine a compensation level based on the levels (or average levels) of noise signals before and after entering the tunnel according to a preset algorithm.

[0148] For example, the active noise control system 100 may determine the compensation level based on a difference between the level (or average level) of the noise signal before and after entering the tunnel.

[0149] After operation S370 , the active noise control system 100 may perform a road noise cancellation operation and an in-tunnel noise cancellation operation by reflecting the compensation level ( S380 ).

[0150] In operation S380, if the level (or average level) of the noise signal after entering the tunnel increases compared to the level (or average level) of the noise signal before entering the tunnel, the active noise control system 100 may increase the levels of the first and second noise cancellation sounds by an increased amount to output the first and second noise cancellation sounds.

[0151] In operation S380, if the level (or average level) of the noise signal after entering the tunnel is reduced compared to the level (or average level) of the noise signal before entering the tunnel, the active noise control system 100 may reduce the levels of the first noise cancellation sound and the second noise cancellation sound by the reduced amount to output the first noise cancellation sound and the second noise cancellation sound.

[0152] At least some of the components described in the examples of this disclosure may be implemented by hardware elements, including at least one of a digital signal processor (DSP), a processor, a controller, an application-specific integrated circuit (ASIC), a programmable logic device (FPGA, etc.), and other electronic devices, or a combination thereof. Furthermore, at least some of the functions or processes described in the examples may be implemented as software, and the software may be stored in a non-transitory recording medium. At least some of the components, functions, and processes described in the examples of this disclosure may be implemented by a combination of hardware and software.

[0153] The examples disclosed herein have been made to meet the aforementioned needs in the prior art, and the technical examples are to provide systems and methods for actively controlling not only noise generated due to vehicle contact with the ground (road noise) but also noise occurring during driving in a tunnel (in-tunnel noise), and vehicles including the systems and methods.

[0154] Other technical examples will provide a system and method for actively controlling not only road noise but also noise in a tunnel by using a microphone for conventional active noise control, and a vehicle including the system and method.

[0155] Other technical examples will provide a system and method for automatically controlling noise in a tunnel without adding any additional microphones / costs when entering the tunnel, and a vehicle including the system and method.

[0156] Other technical examples will provide a system and method for effectively controlling road noise and noise in a tunnel by reflecting the difference between noise levels before and after entering the tunnel, and a vehicle including the system and method.

[0157] The technical subject matter of the present disclosure may not be limited to the above-mentioned technical subject matter, and those skilled in the art to which the present disclosure pertains may clearly understand other subject matters contemplated by the present disclosure through the following description.

[0158] To implement the above-described technical example, a system and method for actively controlling not only noise generated due to vehicle contact with the ground (road noise) but also noise occurring during driving in a tunnel (in-tunnel noise), and a vehicle including the system and method may be provided.

[0159] Furthermore, a system and method for effectively controlling road noise and noise in a tunnel by reflecting the difference between noise levels before and after entering the tunnel, and a vehicle including the system and method can be provided.

[0160] An active noise control system according to an example of the present disclosure is an active noise control system for eliminating a noise signal provided by a sound sensor that receives noise outside a vehicle, and may include: a first noise cancellation module that performs a first noise cancellation operation on a noise signal within a preset first frequency band in the noise signal; a second noise cancellation module that performs a second noise cancellation operation on a noise signal within a preset second frequency band in the noise signal; and a control module that controls the first noise cancellation module and the second noise cancellation module and controls the second noise cancellation module to selectively perform the second noise cancellation operation based on whether the vehicle enters a tunnel.

[0161] According to an example, the first frequency band may include a frequency band for road noise, and the second frequency band may include a frequency band for in-tunnel noise.

[0162] According to an example, the control module may control the first noise cancellation module to perform the first noise cancellation operation in response to the vehicle being outside the tunnel and in response to the vehicle being inside the tunnel.

[0163] According to an example, the control module may operate based on input tunnel entry information to determine a noise level before the vehicle enters the tunnel and a noise level after the vehicle enters the tunnel, and may control operations of the first noise cancellation module and the second noise cancellation module based on a difference between the noise level before the vehicle enters the tunnel and the noise level after the vehicle enters the tunnel.

[0164] According to an example, tunnel entry expectation information, tunnel entry start information, and tunnel entry completion information may be sequentially input as the tunnel entry information.

[0165] According to an example, the control module may determine the level of a noise signal input between the time of receiving the tunnel entry expectation information and the time of receiving the tunnel entry start information, and may determine the level of a noise signal input between the time of receiving the tunnel entry start information and the time of receiving the tunnel entry completion information.

[0166] According to the example, the control module may output compensation level information corresponding to the difference to the first noise cancellation module and the second noise cancellation module, the first noise cancellation module may change the level of the first noise cancellation sound according to the compensation level information to output the first noise cancellation sound, and the second noise cancellation module may change the level of the second noise cancellation sound according to the compensation level information to output the second noise cancellation sound.

[0167] According to an example, the control module may output upward compensation level information corresponding to an increase in response to an increase in the noise level after the vehicle enters the tunnel compared to the noise level before the vehicle enters the tunnel, and may output downward compensation level information corresponding to a decrease in response to a decrease in the noise level after the vehicle enters the tunnel compared to the noise level before the vehicle enters the tunnel.

[0168] According to an example, each of the first noise cancellation module and the second noise cancellation module may perform a noise cancellation operation by outputting a noise cancellation sound having an anti-phase with respect to a noise signal to be cancelled, and may change a level of the noise cancellation sound according to the compensation level information in response to receiving compensation level information from the control module to output the noise cancellation sound.

[0169] An active noise control method according to an example is an active noise control method for eliminating a noise signal provided by a sound sensor that receives noise outside a vehicle, which may include performing a first noise cancellation operation on a noise signal in a preset first frequency band among the noise signals by using a first noise cancellation module and performing a second noise cancellation operation on a noise signal in a preset second frequency band among the noise signals by using a second noise cancellation module, wherein the second noise cancellation operation can be selectively performed by a control module according to whether the vehicle enters a tunnel.

[0170] According to an example, the first noise cancellation operation may be performed both in response to the vehicle being outside the tunnel and in response to the vehicle being inside the tunnel.

[0171] According to an example, active noise control may further include determining a noise level before the vehicle enters a tunnel and a noise level after the vehicle enters the tunnel based on tunnel entry information by using a control module, and controlling operations of the first noise cancellation module and the second noise cancellation module based on a difference between the noise level before the vehicle enters the tunnel and the noise level after the vehicle enters the tunnel by using the control module.

[0172] According to an example, determining a noise level before a vehicle enters a tunnel and a noise level after the vehicle enters the tunnel may include determining a level of a noise signal input between a time of receiving tunnel entry expectation information and a time of receiving tunnel entry start information, and determining a level of a noise signal input between a time of receiving tunnel entry start information and a time of receiving tunnel entry completion information.

[0173] According to an example, controlling the operations of the first noise cancellation module and the second noise cancellation module may include outputting compensation level information corresponding to the difference to the first noise cancellation module and the second noise cancellation module to control each of the first noise cancellation module and the second noise cancellation module to change the level of the output noise cancellation sound.

[0174] According to an example, controlling the operations of the first noise cancellation module and the second noise cancellation module may include: in response to an increase in the noise level after the vehicle enters the tunnel compared to the noise level before the vehicle enters the tunnel, outputting upward compensation level information corresponding to the increase; and in response to a decrease in the noise level after the vehicle enters the tunnel compared to the noise level before the vehicle enters the tunnel, outputting downward compensation level information corresponding to the decrease.

[0175] According to an example, performing a first noise cancellation operation may include outputting a first noise cancellation sound having an anti-phase with respect to a noise signal in a first frequency band, performing a second noise cancellation operation may include outputting a second noise cancellation sound having an anti-phase with respect to a noise signal in a second frequency band, and the method may further include outputting the first noise cancellation sound and the second noise cancellation sound by changing the levels of the first noise cancellation sound and the second noise cancellation sound based on compensation level information from a control module.

[0176] A vehicle according to an example of the present disclosure is a vehicle including a sound sensor that receives noise outside the vehicle and outputs a noise signal corresponding to the noise; an information providing device that provides vehicle entry information in response to the vehicle entering a tunnel; and an active noise control system that performs a first noise cancellation operation on a noise signal in a preset first frequency band among the noise signals, performs a second noise cancellation operation on a noise signal in a preset second frequency band among the noise signals, and selectively performs the second noise cancellation operation by determining whether the vehicle enters the tunnel, based on the vehicle entry information.

[0177] According to an example, the vehicle may further include an operation control device that controls the start and end of operation of the active noise control system, and the active noise control system may perform a first noise cancellation operation in response to receiving an operation start signal from the operation control device, and may perform a second noise cancellation operation based on vehicle entry information after performing the first noise cancellation operation.

[0178] According to an example, the vehicle may further include a user interface that outputs a noise compensation function activation signal based on a user's input control, and in response to receiving the noise compensation function activation signal, the active noise control system may perform a first noise cancellation operation and a second noise cancellation operation based on a difference between the noise before the vehicle enters the tunnel and the noise after the vehicle enters the tunnel.

[0179] In addition to solutions to the above-described technical subjects, details of various examples according to the present disclosure are included in the following description and drawings.

[0180] According to examples of the present disclosure, a system and method for actively controlling not only noise generated due to vehicle contact with the ground (road noise) but also noise occurring during driving in a tunnel (in-tunnel noise), and a vehicle including the system and method may be provided.

[0181] While conventional methods can control road noise, using active noise control technology according to examples of the present disclosure enables control of both road noise and in-tunnel noise.

[0182] According to an example of the present disclosure, a system and method for actively controlling not only road noise but also noise in a tunnel by using a microphone for conventional active noise control, and a vehicle including the system and method may be provided.

[0183] Thus, control of both road noise and noise inside the tunnel can be achieved while minimizing additional costs.

[0184] According to an example of the present disclosure, a system and method for actively controlling road noise and in-tunnel noise by reflecting the difference between noise levels before and after entering the tunnel, and a vehicle including the system and method may be provided.

[0185] Therefore, using the active noise control technology according to examples of the present disclosure makes it possible to effectively control road noise and in-tunnel noise, and reduce the perception of the difference felt by the user due to environmental changes before and after entering the tunnel.

[0186] Further, since the noise in the tunnel can be controlled in a software manner, physical noise reduction work in the tunnel (for example, attaching sound absorbers) can be reduced, and time and cost for the work can be saved.

[0187] If the active noise control technology according to an example of the present disclosure is applied to a vehicle, the marketability and functionality of the vehicle may be improved, and an increase in vehicle sales may be expected.

[0188] Advantageous effects of the present disclosure may not be limited to the above-mentioned effects, and other effects that are not mentioned may be clearly understood by those skilled in the art to which the present disclosure pertains through the following description.

[0189] The above-mentioned subjects to be solved, solutions and advantageous effects thereof are not intended to specify essential features of the claims, and thus the scope of protection of the claims is not limited by the description of the present disclosure.

[0190] Although examples of the present disclosure have been described above with reference to the accompanying drawings, the present disclosure is not necessarily limited to these examples, and various modifications and changes may be made thereto without departing from the technical concept of the present disclosure. Therefore, the examples set forth herein are not intended to limit the technical ideas of the present disclosure, but are intended to explain the technical ideas of the present disclosure, and the scope of the technical ideas of the present disclosure is not limited to these examples. Therefore, the examples described above should be interpreted as being illustrative rather than restrictive in all examples. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for eliminating a noise signal, the device comprising: a sensor configured to detect noise external to a vehicle and generate a noise signal, wherein the noise signal is associated with the noise external to the vehicle; a first noise cancellation circuit for generating a first noise cancellation signal associated with a first frequency band; a second noise cancellation circuit for generating a second noise cancellation signal associated with a second frequency band; one or more processors; and a memory storing instructions that, when executed by the one or more processors, cause the device to: controlling the first noise cancellation circuit to perform a first noise cancellation operation on a first noise signal of the noise signals in the first frequency band; and Based on a determination that the vehicle has entered an enclosed space, controlling the second noise cancellation circuit to perform a second noise cancellation operation on a second noise signal of the noise signal in a second frequency band associated with a portion of the detected noise generated while the vehicle is within the enclosed space.

2. The device according to claim 1, wherein The first frequency band includes a frequency band for road noise, and the second frequency band includes a frequency band for noise within an enclosed space.

3. The device according to claim 1, wherein The first frequency band includes a first frequency range from 0 to 599 Hz and the second frequency band includes a second frequency range from 601 to 3000 Hz.

4. The device according to claim 1, wherein The instructions, when executed by the one or more processors, further cause the apparatus to: determining a first noise level before the vehicle enters the enclosed space and a second noise level after the vehicle enters the enclosed space based on enclosed space entry information, and The first and second noise cancellation operations are controlled based on a difference between the first and second noise levels.

5. The device according to claim 4, wherein The enclosed space entry information includes enclosed space entry expectation information, enclosed space entry start information and enclosed space entry completion information in sequence, and Wherein, when the instructions are executed by the one or more processors, the device further causes: determining a first level of a first noise signal input between a time when the enclosed space entry desire information is received and a time when the enclosed space entry start information is received; and A second level of a second noise signal input between a time when the enclosed space entry start information is received and a time when the enclosed space entry completion information is received is determined.

6. The device according to claim 4, wherein The instructions, when executed by the one or more processors, further cause the apparatus to: outputting compensation level information based on a difference between the first noise level and the second noise level; outputting a first noise cancellation sound based on the compensation level information; as well as Based on the compensation level information, a second noise cancellation sound is output.

7. The apparatus according to claim 4, wherein The instructions, when executed by the one or more processors, further cause the apparatus to: outputting upward compensation level information based on the second noise level which is higher than the first noise level; and Based on the second noise level being lower than the first noise level, downward compensation level information is output.

8. The apparatus according to claim 1, wherein The instructions, when executed by the one or more processors, further cause the apparatus to: performing a noise cancellation operation by outputting a noise cancellation sound, wherein the noise cancellation sound includes an anti-phase relative to a noise signal to be cancelled; changing the level of the noise cancellation sound based on the compensation level information; and Outputs the changed level of the noise cancellation sound.

9. A method performed by an apparatus for eliminating a noise signal, the method comprising: generating a noise signal based on a sensor of the device detecting noise outside the vehicle; generating, by a first noise cancellation circuit of the device, a first noise cancellation signal associated with a first frequency band; performing, by a first noise cancellation circuit of the device, a first noise cancellation operation on a first noise signal of the noise signals in the first frequency band; generating, by a second noise cancellation circuit of the device and based on a determination that the vehicle has entered an enclosed space, a second noise cancellation signal associated with a second frequency band; as well as A second noise cancellation operation is performed, by second noise cancellation circuitry of the device and based on a determination that the vehicle has entered an enclosed space, on a second noise signal of the noise signal in a second frequency band associated with a portion of noise detected to be generated while the vehicle is within the enclosed space.

10. The method according to claim 9, wherein: The first frequency band includes a frequency band for road noise, and the second frequency band includes a frequency band for noise within an enclosed space.

11. The method according to claim 9, further comprising: determining, based on enclosed space entry information, a first noise level before the vehicle enters the enclosed space and a second noise level after the vehicle enters the enclosed space; as well as The first and second noise cancellation operations are controlled based on a difference between the first and second noise levels.

12. The method according to claim 11, wherein The enclosed space entry information includes enclosed space entry expectation information, enclosed space entry start information and enclosed space entry completion information in sequence, and Wherein, determining the first noise level before the vehicle enters the enclosed space and the second noise level after the vehicle enters the enclosed space comprises: determining a first level of a first noise signal input between a time when the enclosed space entry desire information is received and a time when the enclosed space entry start information is received; and A second level of a second noise signal input between a time when the enclosed space entry start information is received and a time when the enclosed space entry completion information is received is determined.

13. The method according to claim 11, wherein Controlling the first noise cancellation operation and the second noise cancellation operation includes: outputting compensation level information based on a difference between the first noise level and the second noise level; and Based on the compensation level information, the level of the output noise cancellation sound is changed.

14. The method according to claim 11, wherein Controlling the first noise cancellation operation and the second noise cancellation operation includes: outputting upward compensation level information based on the second noise level which is higher than the first noise level; and Based on the second noise level being lower than the first noise level, downward compensation level information is output.

15. The method according to claim 9, wherein performing the first noise cancellation operation includes outputting a first noise cancellation sound, wherein the first noise cancellation sound includes an anti-phase relative to the first noise signal in the first frequency band, and Wherein, performing the second noise cancellation operation includes outputting a second noise cancellation sound, wherein the second noise cancellation sound includes an anti-phase relative to the second noise signal in the second frequency band, and further includes: outputting the first noise cancellation sound and the second noise cancellation sound by changing a first level of the first noise cancellation sound and a second level of the second noise cancellation sound based on compensation level information.

16. A non-transitory computer-readable medium storing instructions for canceling a noise signal, the instructions, when executed, causing: The device's sensor detects noise outside the vehicle and generates a noise signal, wherein The noise signal is associated with the noise external to the vehicle; The first noise cancellation circuit of the device: performing a first noise cancellation operation on a first noise signal of the noise signals in the first frequency band; and generating a first noise cancellation signal associated with the first frequency band; The second noise cancellation circuit of the device: performing a second noise cancellation operation on a second noise signal of the noise signal in a second frequency band based on the determination that the vehicle has entered an enclosed space; and generating a second noise cancellation signal associated with the second frequency band, The second frequency band is associated with a portion of the detected noise generated when the vehicle is within the enclosed space.

17. The non-transitory computer-readable medium of claim 16, wherein: The first frequency band includes a frequency band for road noise, and the second frequency band includes a frequency band for noise within an enclosed space.

18. The non-transitory computer-readable medium of claim 16, wherein: When the instructions are executed, the device: determining, based on enclosed space entry information, a first noise level before the vehicle enters the enclosed space and a second noise level after the vehicle enters the enclosed space; as well as The first and second noise cancellation operations are controlled based on a difference between the first and second noise levels.

19. The non-transitory computer-readable medium of claim 18, wherein: The enclosed space entry information includes enclosed space entry expectation information, enclosed space entry start information and enclosed space entry completion information in sequence, and When the instructions are executed, the device determines the first noise level before the vehicle enters the enclosed space and the second noise level after the vehicle enters the enclosed space by: determining a first level of a first noise signal input between a time when the enclosed space entry desire information is received and a time when the enclosed space entry start information is received; and A second level of a second noise signal input between a time when the enclosed space entry start information is received and a time when the enclosed space entry completion information is received is determined.

20. The non-transitory computer-readable medium of claim 18, wherein: When the instructions are executed, the device controls the first noise cancellation operation and the second noise cancellation operation by: outputting compensation level information based on a difference between the first noise level and the second noise level; and Based on the compensation level information, the level of the output noise cancellation sound is changed.

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