KR20230009149A - Sound system for vehicle and sound output method using the system - Google Patents

Abstract

The present invention relates to a sound system for a vehicle and a sound output method thereof. The sound output method of the sound system for the vehicle of the present invention comprises the following steps of: transmitting, by a lane departure warning system, lane departure information obtained by sensing a lane to the sound system for the vehicle; and generating and outputting, by the sound system for the vehicle, an ultrasonic warning sound through a parametric speaker installed near a driver's seat among a plurality of parametric speakers installed in the vehicle, according to the lane departure information. An objective of the present invention is to provide the sound system for the vehicle for preventing an interference phenomenon, and the sound output method thereof.

Description

Vehicle sound system and its sound output method {SOUND SYSTEM FOR VEHICLE AND SOUND OUTPUT METHOD USING THE SYSTEM}

The present invention relates to a method for outputting sound for a vehicle, and more particularly, to a method for outputting sound for a vehicle for outputting independent sounds for each occupant.

A typical vehicle audio system includes a speaker that outputs a sound source in the vehicle. When a single speaker is installed in a vehicle, since the speaker transmits sound sources in all directions within the vehicle, each occupant cannot hear different sound sources.

In order to provide different sound sources for each occupant, a plurality of speakers need to be installed in a vehicle. At this time, each speaker is installed at an appropriate location close to the corresponding passenger seat.

In this way, when a plurality of speakers are installed in a vehicle, interference may occur between a sound source output from one speaker and a sound source output from another speaker, and thus the sound quality of the sound source output from each speaker is degraded.

An object of the present invention is to provide a vehicle audio system and its sound output method for preventing interference that may occur between a sound source heard by each occupant and a sound source heard by other top boxes in a situation where occupants in a vehicle listen to different sound sources. is to do

Another object of the present invention is to provide a vehicle sound system that detects lane departure of a vehicle in conjunction with a Lane Departure Warning System (LDWS) and outputs a three-dimensional ultrasonic warning sound to warn a driver of lane departure, and its sound It is to provide an output method.

The foregoing and other objects, advantages and characteristics of the present invention, and methods of achieving them will become clear with reference to the embodiments described below in detail in conjunction with the accompanying drawings.

In order to achieve the above object, a sound output method of a vehicle sound system according to an aspect of the present invention includes the steps of a lane departure warning system detecting a lane and transmitting acquired lane departure information to the vehicle sound system; and generating and outputting, by the vehicle sound system, an ultrasonic warning sound through a parametric speaker installed near a driver's seat among a plurality of parametric speakers installed in the vehicle according to the lane departure information.

In an embodiment, the outputting may be a step of generating and outputting the ultrasonic warning sound focused on the front left side or the front right side of the driver's seat according to the lane departure information indicating left lane departure or right lane departure.

In an embodiment, the ultrasonic warning sound may be a stereophonic sound focused on the front left or right front of the driver's seat.

In an embodiment, the outputting may include generating and outputting the ultrasonic warning sound focused on the front left side of the driver's seat according to the lane departure information indicating left lane departure; and generating and outputting the ultrasonic warning sound focused on the front right side of the driver's seat according to the lane departure information indicating right lane departure.

In an embodiment, the outputting may include adjusting and outputting a volume of the ultrasonic warning sound according to a lateral distance between the own vehicle and the lane included in the lane departure information.

In an embodiment, the outputting may include generating the ultrasonic warning sound focused on the front left side or the front right side of the driver's seat according to identification information related to lane departure included in the lane departure information; and adjusting and outputting a volume of the ultrasonic warning sound according to a lateral distance between the lane and the host vehicle included in the lane departure information.

In an embodiment, the outputting may include generating an ultrasonic warning sound according to the lane departure information, and the generating of the ultrasonic warning sound may include the in-vehicle sound system installed near a first seat in the vehicle. generating an anti-phase signal to an audio signal output from the second parametric speaker when the first parametric speaker and the second parametric speaker installed near the second seat are included; generating a transmission signal by synthesizing an audio signal (g(t)) that the occupant of the first seat wants to hear through the first parametric speaker and the anti-phase signal; and generating the ultrasonic alarm sound by modulating the transmission signal.

In an embodiment, the generating of the anti-phase signal may include an attenuation coefficient according to an audio signal output from the second parametric speaker and a distance from the second parametric speaker to an occupant seated in the second seat. It may be a step of generating the anti-phase signal by using.

In an embodiment, the step of modulating the transmission signal E(t) to generate an ultrasonic alarm sound may be a step of modulating the transmission signal E(t) with an amplitude of an ultrasonic signal according to an amplitude modulation scheme. can

A vehicle audio system according to another aspect of the present invention includes a plurality of parametric speakers installed in a vehicle and outputting ultrasonic alarm sounds; a communication interface that communicates with the lane departure warning system; and a controller configured to output an ultrasonic warning sound through a driver's parametric speaker among the plurality of parametric speakers according to the lane departure information received from the lane departure warning system through the communication interface.

In an embodiment, the ultrasonic warning sound may be a stereophonic sound output to be focused on the front left side or the front right side of the driver's seat according to identification information related to lane departure included in the lane departure information.

In an embodiment, the identification information related to lane departure may be information indicating that the lane departure is departure from the left lane or departure from the right lane of the host vehicle.

In an embodiment, the controller may control to output the ultrasonic warning sound whose volume is adjusted according to a lateral distance between the own vehicle and the lane included in the lane departure information.

In an embodiment, the controller may adjust the volume of the ultrasonic alarm sound in inverse proportion to the lateral distance.

According to the present invention, there is provided a vehicle audio system that delivers independent sound for each occupant using a parametric speaker. Accordingly, when the occupants of the vehicle including the driver want to listen to different music, each occupant can individually hear only desired sounds without interference.

In addition, according to the present invention, when lane departure of the vehicle is expected due to the LDWS, the ultrasonic warning sound is output so that the ultrasonic warning sound is focused at a focusing point in the front left direction or the front right direction of the driver's seat, so that the driver can The lane departure direction can be recognized in three dimensions through an ultrasonic warning sound, and the recognition time can be shortened.

In addition, according to the present invention, by adjusting the volume of the ultrasonic warning sound in inverse proportion to the lateral distance between the vehicle and the lane calculated by LDWS, the driver can easily perceive the degree of danger due to lane departure aurally.

In addition, according to the present invention, interference between the sound source (music) output to the occupant's seat and the ultrasonic alarm sound focused on the front left or right front side of the driver's seat is eliminated based on the focusing point of the ultrasonic warning sound, thereby eliminating the occupant's seat. occupants can listen to the sound source smoothly.

1 is a diagram showing an array form of ultrasonic transducers included in a parametric speaker according to an embodiment of the present invention.
FIG. 2 is a diagram for explaining the magnitude of a signal at a focus point where each signal reaches when the ultrasonic transducers shown in FIG. 1 output signals according to different delay times.
3 is a diagram schematically illustrating an interference phenomenon between a sound output from a driver's seat speaker and a sound output from a rear right speaker installed close to a rear right seat according to an embodiment of the present invention.
4 is a flowchart illustrating a sound output method of a vehicle sound system according to an embodiment of the present invention.
FIG. 5 is a diagram showing the positions of the occupants in the vehicle and parametric speakers used by each occupant to help understand the flow chart shown in FIG. 4 .
6 is a configuration diagram of a vehicle audio system according to an embodiment of the present invention.
7 is a flowchart illustrating a sound output method of a vehicle sound system according to another embodiment of the present invention.
FIG. 8 is a configuration diagram of a sound system for a vehicle according to another embodiment of the present invention for implementing the sound output method shown in FIG. 7 .

The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art, and the following examples may be modified in many different forms, and the scope of the present invention is as follows It is not limited to the examples. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the spirit of the invention to those skilled in the art. In addition, each component in the following drawings is exaggerated for convenience and clarity of explanation, and the same reference numerals refer to the same elements in the drawings. As used herein, the term “and/or” includes any one and all combinations of one or more of the listed items.

The present invention is characterized in providing different independent sounds for each occupant. Therefore, when the occupants of the vehicle want to listen to different music, it is possible to provide each occupant with desired sound quality without interference of the sound heard by other occupants and without reducing the intensity of the sound heard by the other occupants. there is.

To this end, the present invention is configured to include a parametric speaker outputting directional sound.

On the other hand, when sound is output in the driver's seat direction using a parametric speaker, the sound output in the driver's seat direction interferes with the sound that passengers in the rear seat hear through the parametric speaker (or general speaker) installed close to the rear seat. can give

Such interference can be minimized when acoustic energy (sound energy) is concentrated only at a specific point. The present invention provides a method for allowing signals output from an ultrasonic transducer of a parametric speaker to reach only a specific desired point at the same time by using an ultrasonic beam focusing method.

Since the position of the occupant is fixed in the vehicle, the delay time of the interference signal can be known, and the sound source each occupant hears can be known from the audio system.

Therefore, the method according to the present invention minimizes mutual interference by using an active noise canceling method that simultaneously outputs antiphase information of sounds (eg, music) heard by other occupants.

As such, if mutual interference between sounds is minimized, independent sounds may be provided for each occupant, and each occupant may hear a preferred sound (eg, music).

In particular, since the driver can listen to preferred music without being disturbed by the music the occupant is listening to, stress caused by driving can be reduced.

Hereinafter, a 'parametric speaker', an 'ultrasound beam focusing method', and an 'active noise control' method applicable to the present invention will be described.

Parametric speaker

Because sound waves have long wavelengths, they propagate in all directions.

In order to add directivity to sound waves, in the present invention, a parametric speaker is used that propagates sound only in a specific direction using ultrasonic waves having a short wavelength and generates sound using nonlinear characteristics of a medium.

A sound signal generated from an ultrasonic signal using a quasi-linear technique is expressed in Equation 1 below.

When the transmission signal E(t) is modulated with the amplitude of the ultrasonic signal according to the AM modulation method and transmitted as shown in Equation 2 below, the signal in the audible frequency band is expressed as Equation 3 below.

The variables included in Equations 1 and 2 can be defined as follows.

Therefore, when the signal generated as shown in Equation 4 is AM-modulated into an ultrasonic signal and transmitted, the occupant can hear the audio signal g(t).

Here, m is the modulation depth.

The angle of view of a sound wave has a characteristic of decreasing as the frequency increases. When a parametric speaker is used, sound waves can be transmitted at a beam angle of ultrasonic waves, and sound can be transmitted only in a specific direction.

Ultrasound beam focusing method

When the distance between the speaker and the driver is 50 cm or less, when a 20 cm speaker is implemented using 58 kHz ultrasonic transducers, the distance up to 72.4 cm becomes a near field area through Equation 5 below.

Therefore, in the embodiment of the present invention, ultrasonic waves are focused using an annular array speaker in which a plurality of ultrasonic transducers are arranged in a circular shape to form maximum sound pressure near the ears of the occupant.

1 is a diagram showing an array of ultrasonic transducers included in a parametric speaker according to an embodiment of the present invention, and FIG. 2 is a case where the ultrasonic transducers shown in FIG. 1 output ultrasonic waves according to a fixed delay time. , It is a diagram for explaining the magnitude of the signal at the focus where each ultrasonic wave arrives.

As shown in FIG. 1, when configuring a speaker using N ultrasonic transducers 10, the delay time (r ₀ /c, r at the output of each transducer 10 as shown in Equation 6 below) ₁ /c, r ₂ /c, … r _N-1 /c), as shown in FIG. 2, the signals reaching the focal point at the same time are focused (or synthesized), and the The size increases by N times. This is referred to as a 'time delay based transmission fixed convergence method'.

The signal focused at the focal point is redistributed as the distance increases, so that at other occupant positions, only a single transducer output is delivered again. Therefore, it is possible to transmit sound at a level that can be heard only at a specific occupant's position.

Here, P1(t, n) = P1(t - τ + r _n /c), τ is a fixed delay delay time, and c is a sound speed.

Active Noise Canceling Method

3 is a diagram schematically illustrating an interference phenomenon between a sound output from a driver's seat speaker and a sound output from a rear right speaker installed close to a rear right seat according to an embodiment of the present invention.

Since the interior space of a vehicle is narrow, sound waves can reach other occupants even though the speaker is directional and the sound energy is concentrated at a specific location (near the ears of the occupants) through focusing.

For example, as shown in FIG. 3 , a sound wave output from a parametric speaker 30 installed near a driver's seat reaches an occupant in a rear right seat. Therefore, the sound output from the parametric speaker 30 installed near the driver's seat and the sound output from the rear right speaker 50 may interfere with each other.

)를 사용하여 간섭을 제거한다. Since the vehicle sound system according to an embodiment of the present invention knows information about the sound sources heard by each occupant, the rear right speaker 50 generates an anti-phase signal for the output of the driver's seat speaker included in Equation 7 below (

) to remove the interference.

Here, r _{rear right seat} is the distance from the driver's seat speaker 30 to the rear right occupant, α is an attenuation coefficient according to the distance, g _drive () is an audio signal output from the driver's seat speaker 30, and g _{rear right seat} ( ) is an audio signal output from the rear right speaker 50 .

If 4 people are listening to different sound sources in a vehicle, Equation 7 above is configured to include 3 anti-phase signals, so that the sound source that each occupant is listening to interferes with the sound source that other occupants are listening to. eliminate the phenomenon.

That is, three anti-phase signals are included in the output of the rear right speaker 50. In this case, the three anti-phase signals are the anti-phase signal for the audio signal output from the driver's seat speaker 30, the anti-phase signal for the audio signal output from the front right speaker, and the audio signal output from the rear left speaker. contains an anti-phase signal for

4 is a flowchart illustrating a sound output method of a vehicle audio system according to an embodiment of the present invention, and FIG. 5 is a parameter used by passengers and each passenger to help understand the flowchart shown in FIG. 4 . It is a diagram showing the location of the metric speaker.

In the sound output method according to an embodiment of the present invention, as shown in FIG. 5, four parametric speakers 30, 40, 50, and 60 are installed, and four passengers 32, 42, and and 62) are assumed to be in the vehicle. In addition, in the sound output method according to the embodiment of the present invention, only the sound output method from the first parametric speaker 30 is described, and the sound output method of each of the other parametric speakers 40, 50, and 60 is described. For this, it is replaced with a description of the sound output method from the first parametric speaker 30.

In addition, it is assumed that the four occupants 32, 42, 52, and 62 listen to different sound sources (hereinafter, audio signals) through respective parametric speakers.

First, in step S410, second to fourth audio signals causing interference with the first audio signal that the first occupant 32 (the driver) wants to hear through the first parametric speaker 30 are generated. A process of generating an anti-phase signal is performed. Here, the second to fourth audio signals are sound sources heard by the second to fourth occupants 42, 52, and 62, and are respectively output through the second to fourth parametric speakers 40, 50, and 60. to be.

)에 대한 제2 역-위상 신호(

)는, 제2 파라메트릭 스피커(40)로부터 출력되는 상기 제2 오디오 신호(

와 상기 제2 파라메트릭 스피커(40)로부터 상기 제1 좌석에 착석한 제1 탑승자(32, 운전자의 귀 근처)까지의 거리(도5의

)에 따른 감쇄 계수(

)를 이용하여 생성될 수 있다. 여기서, 거리(도5의

)에 따른 감쇄 계수(

)는 차량 내의 온도, 습도, 기압에 따라 결정되는 고정된 값으로서,

와 같이 지수함수 형태로 나타낼 수 있다. The second audio signal (

) for the second anti-phase signal (

) is the second audio signal output from the second parametric speaker 40 (

and the distance from the second parametric speaker 40 to the first occupant 32 (near the driver's ear) seated in the first seat (see FIG. 5)

) according to the attenuation coefficient (

) can be created using Here, the distance (of FIG. 5

) according to the attenuation coefficient (

) is a fixed value determined according to the temperature, humidity, and atmospheric pressure in the vehicle,

It can be expressed in the form of an exponential function as

)는 상기 제2 오디오 신호(

와 지수 함수 형태(e)로 표현되는 감쇄 계수(

)의 곱셈 연산에 의해 계산될 수 있다.

에서, 아래 첨자 fr은 'front right'의 약자이다.The second anti-phase signal (

) is the second audio signal (

and the attenuation coefficient expressed in the exponential form (e) (

) can be calculated by the multiplication operation of

, the subscript fr stands for 'front right'.

)에 대한 제3 역-위상 신호(

)는, 제3 파라메트릭 스피커(50)로부터 출력되는 상기 제3 오디오 신호(

)와 상기 제3 파라메트릭 스피커(50)로부터 상기 제1 좌석에 착석한 제1 탑승자(32, 운전자의 귀 근처)까지의 거리(도5의

)에 따른 지수함수 형태(e)의 감쇄 계수(

)를 이용하여 생성될 수 있다.

에서 아래 첨자 rr은 'rear right'의 약자이다.Similarly, the third audio signal (

) for the third anti-phase signal (

) is the third audio signal output from the third parametric speaker 50 (

) and the distance from the third parametric speaker 50 to the first occupant 32 (near the driver's ear) seated in the first seat (see FIG. 5).

Attenuation coefficient of the exponential form (e) according to ) (

) can be created using

In , the subscript rr is an abbreviation for 'rear right'.

)에 대한 제4 역-위상 신호(

)는, 제4 파라메트릭 스피커(60)로부터 출력되는 상기 제4 오디오 신호(

)와 상기 제4 파라메트릭 스피커(60)로부터 상기 제1 좌석에 착석한 제1 탑승자(32, 운전자의 귀 근처)까지의 거리(도5의

)에 따른 지수함수 형태(e)의 감쇄 계수(

)를 이용하여 생성될 수 있다.

에서, 아래 첨자 rl은 'rear left'의 약자이다.Similarly, the fourth audio signal (

) for the fourth anti-phase signal (

) is the fourth audio signal output from the fourth parametric speaker 60 (

) and the distance from the fourth parametric speaker 60 to the first occupant 32 (near the driver's ear) seated in the first seat (see FIG. 5).

Attenuation coefficient of the exponential form (e) according to ) (

) can be created using

, the subscript rl stands for 'rear left'.

,

및

)를 합성하여, 송신 신호(A)를 생성하는 과정이 수행된다. 생성된 송신 신호는 아래의 식 8과 같다.Subsequently, in step S420, the audio signal g _drive (t) that the occupant 32 of the first seat wants to hear through the first parametric speaker 30 and the second to fourth anti-phase signals (

,

and

), and a process of generating a transmission signal A is performed. The generated transmission signal is shown in Equation 8 below.

Next, in step S430, a process of modulating the transmission signal A to generate an ultrasonic signal including the modulated transmission signal E(t) is performed. The modulated transmission signal E(t) is shown in Equation 9 below.

Here, m is the modulation depth.

Subsequently, in step S440, a process of outputting the generated ultrasonic signal by the first parametric speaker 30 is performed.

An ultrasonic signal including the modulated transmission signal E(t) is expressed as Equation 10 below.

Here, w ₀ is the frequency of the ultrasonic signal.

Meanwhile, in the step S440, the first parametric speaker 30 includes a plurality of ultrasonic transducers (10 in FIG. 1), and each ultrasonic transducer has a different delay time (for example, r ₀ /c, r ₁ /c, r ₂ /c, r _N-1 /c), the modulated ultrasonic signal is output in the direction of the first occupant.

6 is a configuration diagram of a vehicle audio system according to an embodiment of the present invention.

Referring to FIG. 6 , the vehicle audio system 100 includes an anti-phase signal generator 110 , a synthesizer 120 , a modulator 130 , a parametric speaker 140 and a controller 150 .

The anti-phase signal generator 110 may be a hardware module, a software module, or a combination thereof that processes step S410 of FIG. 4 .

When the first to third passengers are sitting in the first to third seats in the vehicle and the first to third passengers listen to different sound sources, the anti-phase signal generator 120 generates the second A second anti-phase signal for a second audio signal output from the second parametric speaker installed near the second seat as a second parametric speaker used by the occupant and a third parametric signal used by the third occupant As a metric speaker, an anti-phase signal including a third anti-phase signal for a third audio signal output from the third parametric speaker installed near the third seat is generated.

The second audio signal is an audio signal corresponding to a sound source desired to be heard by the second occupant, and the third audio signal is an audio signal corresponding to a sound source desired to be heard by the third occupant.

The second anti-phase signal is, for example, a signal calculated by multiplying the second audio signal and an attenuation coefficient in the form of an exponential function according to a distance from the second parametric speaker to the first occupant. .

The third anti-phase signal may be, for example, a signal calculated by multiplying the third audio signal and an attenuation coefficient in the form of an exponential function according to a distance from the third parametric speaker to the first occupant. there is.

The synthesizer 120 may be a software module, a hardware module, or a combination thereof that performs step S420 of FIG. 4 .

The synthesizer 120, for example, synthesizes the first audio signal that the first occupant wants to hear and the anti-phase signal including the first to third anti-phase signals to obtain a transmission signal A. generate

The modulator 130 may be implemented as a software module performing step S430 of FIG. 4, a hardware module, or a combination thereof.

The modulator 140 modulates the transmission signal A generated by the synthesizer 120 in an amplitude modulation manner to generate a modulated transmission signal E(t). Also, the modulator 140 generates an ultrasonic signal E(t)sin(w ₀ t) including the modulated transmission signal E(t).

A parametric speaker (140, hereinafter referred to as 'first parametric speaker') is installed near the first seat so that the first occupant can hear the first audio signal included in the ultrasonic signal. According to the control of 150, the ultrasonic signal is output.

The first parametric speaker 140 includes a plurality of ultrasonic transducers, and each ultrasonic transducer outputs the modulated ultrasonic signal toward the first occupant at different delay times under the control of the controller 150. do.

The controller 150 may be implemented with at least one processor that controls the output of the first parametric speaker 140 and simultaneously controls and executes the operations of the other components 110 to 140 .

Although the synthesizer 120 and the modulator 130 are shown separately in FIG. 6, they may be integrated into one block. In this case, synthesizer 120 may be designed to be included in modulator 130.

Also, the anti-phase signal generator 110, synthesizer 120, modulator 130, and controller 150 shown in FIG. 6 may be integrated into one hardware module. For example, anti-phase signal generator 110, synthesizer 120, and modulator 130 may be incorporated into controller 150. In this case, the controller 150 may be implemented as a single chip.

7 is a flowchart illustrating a sound output method of a vehicle sound system according to another embodiment of the present invention.

A sound output method according to another embodiment of the present invention relates to a sound output method of a vehicle sound system that works with a lane departure warning system (hereinafter, LDW).

As is well known, LDWS obtains information about the lateral distance, speed, etc. of the lane and the host vehicle using sensors such as cameras and radars mounted on the vehicle, and uses the obtained information to determine the degree of danger of lane departure. A system that warns the driver.

The vehicle sound system interlocking with the LDWS receives lane departure risk information representing the degree of danger of lane departure from the LDWS, and based on the lane departure risk information, an ultrasonic signal generated according to the method described with reference to FIGS. 1 to 6 ( Hereinafter referred to as 'ultrasonic alarm sound') is output to the front left convergence point or the front right convergence point of the driver's seat.

In this way, the driver can three-dimensionally recognize the direction of lane departure through an ultrasonic warning sound and shorten the recognition time.

In addition, the vehicle sound system that works with the LDWS adjusts the volume of the ultrasonic warning sound in inverse proportion to the lateral distance between the vehicle and the lane calculated by the LDWS, so that the driver can easily perceive the danger level due to lane departure audibly. can do.

In addition, the vehicle sound system interlocking with the LDWS removes interference between the sound source (music) output to the occupant's seat and the ultrasonic alert sound focused on the front left or right side of the driver's seat based on the focusing point of the ultrasonic alert sound. , the occupant of the occupant's seat can smoothly listen to the sound source.

Hereinafter, a sound output method of a vehicle sound system that works with LDWS will be described in detail.

Referring to FIG. 7 , first, in S710, a process of determining whether the LDWS is in an on or off state is performed. The LDWS may be turned on or off by a user interface (HMI) installed in the vehicle. The user interface may be an instrument panel having an input function and a display function. If LDWS is in an on state, proceeds to S720.

Subsequently, in S720, when the LDWS is turned on, the LDWS determines whether the left or right turn signal lamp is off. When the left or right direction lamp is off, S730 proceeds.

When the left or right turn signal is turned on, it can be regarded as a situation in which the vehicle leaves the lane according to the driver's intention to change the lane, and thus, in this case, there is no need to warn of lane departure. Therefore, S730 to S780 are not performed.

Subsequently, in S730, the LDWS uses sensors such as cameras and radars mounted on the vehicle to obtain information on the lateral distance between the lane and the host vehicle, the speed of the host vehicle obtained from the vehicle speed sensor, and the steering angle of the steering wheel obtained from the steering angle sensor. used to predict lane departure.

The present invention is not characterized by an algorithm that calculates the lateral distance between the lane and the host vehicle using information detected by a sensor, or an algorithm that predicts lane departure based on the calculated lateral distance and the speed of the host vehicle. , the description thereof is replaced with known technologies related to LDWS.

Next, in S740, it is determined whether the LDWS predicted left lane departure. If the lane departure is left lane departure, S750 proceeds, and if the lane departure corresponds to right lane departure, S760 proceeds.

First, in S750, the LDWS transmits lane departure information indicating left lane departure to the vehicle acoustic system, and the vehicle acoustic system controls the driver's seat based on S410 to S440 of FIG. 4 according to the lane departure information indicating left lane departure. Generates an ultrasonic alarm sound focused on the front left side of the

In S760, the LDWS transmits lane departure information indicating right lane departure to the vehicle acoustic system, and the vehicle acoustic system transmits the front right side of the driver's seat based on S410 to S440 of FIG. 4 according to the lane departure information indicating right lane departure. generates an ultrasonic alarm sound focused on

As described above, by S750 or S760, the ultrasonic alarm sound may be a stereophonic sound in that it is focused on the front left or right front side of the driver's seat.

Following S750 or S760, in S770, the LDWS transmits lane departure information including the lateral distance between the lane and the host vehicle to the vehicle acoustic system, and the vehicle acoustic system transmits lane departure information based on the lateral distance included in the lane departure information. Adjust the volume of the ultrasonic alarm sound. For example, the volume of the ultrasonic warning sound may be adjusted to be inversely proportional to the lateral distance.

Then, in S780, the vehicle sound system outputs the ultrasonic warning sound whose volume is adjusted through a driver's parametric speaker installed near the driver's seat.

Meanwhile, the flow of steps shown in FIG. 7 may be variously changed. For example, S750 and S770 may be selectively performed, and S760 and S770 may be selectively performed. And S730 and S740 can be integrated into one step.

FIG. 8 is a configuration diagram of a sound system for a vehicle according to another embodiment of the present invention for implementing the sound output method shown in FIG. 7 .

Referring to FIG. 8 , the vehicle acoustic system 100 according to another embodiment of the present invention may communicate with the LDWS 200 through an in-vehicle communication network. Here, the in-vehicle communication network may be a Controller Area Network (CAN) or a Local Interconnect Network (LIN).

In FIG. 8 , communication interfaces for connecting the vehicle audio system 100 and the LDWS 200 to an in-vehicle communication network are omitted to simplify the drawing. Accordingly, the vehicle audio system 100 and the LDWS 200 may each be configured to further include a communication interface for accessing an in-vehicle communication network such as CAN or LIN.

A description of the vehicle audio system 100 is replaced with the content described with reference to FIG. 6 .

Since the present invention is not characterized by the hardware configuration included in the LDWS 200, the internal configurations of the LDWS 200 shown in FIG. 8 only show the minimum number of hardware configurations necessary to understand the present invention. Do. Accordingly, the LDWS 200 shown in FIG. 8 may further include known hardware configurations required for system design.

The user interface 210 (Human Machine Interface: HMI) provides an interfacing function between the LDWS 200 and a user (driver or passenger), and may be, for example, a display device having an input function such as a cluster in a vehicle. there is. The LDWS 200 may be turned on or off by a user input through the HMI 210.

The sensor 220 is a component for detecting a lane, and may be a radar sensor, a camera sensor, or a sensor in which they are fused.

The controller 230 is a component that controls and manages the overall operation of the LDWS 200, and may be implemented to include a processor including at least one CPU, at least one GPU, or a combination thereof.

This controller 230 performs processes or executes algorithms required to perform S710 to S780 shown in FIG. 7 . Here, the algorithm includes a known lane recognition algorithm for recognizing lane information from an image obtained by a camera sensor, a known calculation algorithm for calculating a lateral distance between a lane and a driving vehicle based on the recognized lane information, and a lateral A known prediction algorithm for predicting lane departure based on the direction distance and the speed of the host vehicle may be included.

In an embodiment, the controller 230 transmits lane departure information including identification information related to lane departure indicating whether the predicted lane departure is left lane departure or right lane departure through an in-vehicle communication bus (eg, CAN communication bus, LIN communication bus). It can be transmitted to the controller 150 of the vehicle acoustic system 100 through a bus, etc.).

In an embodiment, the controller 230 transmits the lane departure information including the lateral distance between the own vehicle and the lane of the vehicle acoustic system 100 through an in-vehicle communication bus (eg, CAN communication bus, LIN communication bus, etc.) may be transmitted to the controller 150.

In an embodiment, the controller 150 of the vehicle sound system 100 generates and outputs an ultrasonic warning sound focused on the front left side or the front right side of the driver's seat according to lane departure information indicating left lane departure or right lane departure. The components 110 to 140 shown in 6 are controlled.

In an embodiment, the controller 150 of the vehicle sound system 100 adjusts and outputs the volume of the ultrasonic warning sound based on the lateral distance between the own vehicle and the lane included in the lane departure information. Control (110~140).

The embodiments disclosed in this specification should be considered from an illustrative point of view rather than a limiting point of view. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the equivalent range should be construed as being included in the present invention.

Claims (14)

transmitting, by the lane departure warning system, lane departure information obtained by detecting a lane to a vehicle sound system; and
Generating and outputting, by the vehicle sound system, an ultrasonic warning sound through a parametric speaker installed near a driver's seat among a plurality of parametric speakers installed in the vehicle according to the lane departure information
Sound output method of a vehicle sound system comprising a. In paragraph 1,
The outputting step is
generating and outputting the ultrasonic warning sound focused on the front left side or the front right side of the driver's seat according to the lane departure information indicating left lane departure or right lane departure. In paragraph 1,
The ultrasonic alarm sound,
A sound output method of a vehicle sound system, which is a stereophonic sound focused on a front left or right front side of a driver's seat. In paragraph 1,
The outputting step is
generating and outputting the ultrasonic warning sound focused on the front left side of the driver's seat according to the lane departure information indicating left lane departure; and
generating and outputting the ultrasonic warning sound focused on the front right side of the driver's seat according to the lane departure information indicating right lane departure;
Sound output method of a vehicle sound system comprising a. In paragraph 1,
The outputting step is
and adjusting and outputting the volume of the ultrasonic warning sound according to the lateral distance between the own vehicle and the lane included in the lane departure information. In paragraph 1,
The outputting step is
generating the ultrasonic warning sound focused on a front left or right front side of a driver's seat according to identification information related to lane departure included in the lane departure information; and
Adjusting and outputting the volume of the ultrasonic warning sound according to the lateral distance between the lane and the host vehicle included in the lane departure information
Sound output method of a vehicle sound system comprising a. In paragraph 1,
The outputting includes generating an ultrasonic warning sound according to the lane departure information;
Generating the ultrasonic alert sound
When the vehicle sound system includes a first parametric speaker installed near a first seat in the vehicle and a second parametric speaker installed near a second seat,
generating an anti-phase signal for an audio signal output from the second parametric speaker;
generating a transmission signal by synthesizing an audio signal (g(t)) that the occupant of the first seat wants to hear through the first parametric speaker and the anti-phase signal; and
Modulating the transmission signal to generate the ultrasonic alarm sound
Sound output method of a vehicle sound system comprising a. In paragraph 7,
Generating the anti-phase signal,
generating the anti-phase signal using an audio signal output from the second parametric speaker and an attenuation coefficient according to a distance from the second parametric speaker to an occupant seated in the second seat. Sound output method of the sound system. In paragraph 7,
The step of generating an ultrasonic alarm sound by modulating the transmission signal E(t),
The step of modulating the transmission signal (E(t)) with an amplitude of an ultrasonic signal according to an amplitude modulation method. A plurality of parametric speakers installed in the vehicle and outputting ultrasonic alarm sounds;
a communication interface that communicates with the lane departure warning system; and
and a controller configured to output an ultrasonic warning sound through a driver parametric speaker among the plurality of parametric speakers according to the lane departure information received from the lane departure warning system through the communication interface. In paragraph 10,
The ultrasonic warning sound is a stereophonic sound that is output to be focused on a front left or right front side of a driver's seat according to identification information related to lane departure included in the lane departure information. In paragraph 11,
The identification information related to the lane departure,
The vehicle acoustic system, wherein the lane departure is information indicating departure from the left lane or departure from the right lane of the host vehicle. In paragraph 10,
The controller,
The vehicle acoustic system of claim 1 , wherein the ultrasonic warning sound whose volume is adjusted according to the lateral distance between the own vehicle and the lane included in the lane departure information is output. In paragraph 13,
The controller,
and adjusting the volume of the ultrasonic warning sound in inverse proportion to the lateral distance.

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