Acoustic control device and acoustic control method

Abstract

To provide sound having a proper sound quality to occupants regardless of an angel of a display panel.SOLUTION: An acoustic control device includes: a display panel which is supported by a base installed at a vehicle in a manner that an angle can be changed relative to the base; an angle detector which detects an angle of the display panel relative to the base; and a control unit which changes acoustic setting in a passenger compartment according to the angle of the display panel detected by the angle detector.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an acoustic control device and an acoustic control method. [Background technology]

[0002] One example of an in-vehicle audiovisual device is a rear seat entertainment system (RES) that allows rear seats in the vehicle to enjoy TV, DVD, and other images independently of the front seats (see, for example, Patent Document 1). The RES includes, for example, a foldable display device having a base installed on the ceiling of the vehicle and a display panel supported so as to be tiltable relative to the base. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-222276 [Patent Document 2] Japanese Patent Application Laid-Open No. 2009-17094 Summary of the Invention [Problem to be solved by the invention]

[0004] Some folding display devices have speakers on the display panel, allowing users to listen to audio without using speakers or headphones installed in the vehicle. However, in this type of display device, for example, if a vehicle has three rows of seats, the inclination angles of the display panels on the second and third rows of rear seats are different. As a result, even if audio of the same quality is output from the speakers, the audio will sound different to passengers in the second and third rows.

[0005] The tilt angle for second-row seats refers to the angle at which the display panel faces the average head height of second-row seat occupants. That is, the tilt angle for second-row seats refers to the angle at which a line extending normal to the center of the display panel in a plan view passes through the head position of the second-row seat occupants when the vehicle is viewed from the side. However, the tilt angle for second-row seats does not need to exactly match the angle at which the display panel faces the average head height of the second-row seat occupants. The tilt angle for second-row seats may deviate within a certain range (for example, approximately ±20°) from the angle at which the display panel faces the average head height of the second-row seat occupants. The tilt angle for third-row seats refers to the angle at which the display panel faces the average head height of the third-row seat occupants. In other words, the tilt angle for the third-row seats is the angle at which a line extending normal to the center of the display panel in a plan view passes through the head position of an occupant in the third-row seat when the vehicle is viewed from the side. However, the tilt angle for the third-row seats does not need to exactly match the angle at which the display panel faces the average head height of an occupant in the third-row seat. The tilt angle for the third-row seats may deviate within a certain range (for example, about ±20°) from the angle at which the display panel faces the average head height of an occupant in the third-row seat.

[0006] An aspect of the present disclosure is to provide passengers with audio of appropriate sound quality by reducing the effect of the angle of the display panel. [Means for solving the problem]

[0007] An embodiment of the present disclosure is exemplified by an acoustic control device. The acoustic control device includes a display panel supported on a base installed in a vehicle so that the angle of the display panel relative to the base can be changed, an angle detector, and a control unit. The angle detector detects the angle of the display panel relative to the base, The control unit changes the acoustic settings in the vehicle cabin according to the angle of the display panel detected by the angle detector. [Effects of the Invention]

[0008] According to this sound control device, the influence of the angle of the display panel can be reduced, and sound with appropriate sound quality can be provided to the passengers. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram illustrating the configuration of an in-vehicle audio display device as an example of an audio control device according to an embodiment. [Figure 2] FIG. 2 is a diagram illustrating the arrangement of each part of the in-vehicle audio display device within the vehicle. [Figure 3] FIG. 3 is a diagram illustrating the external appearance of a base, a rotation mechanism, and a display panel of the in-vehicle audio display device. [Figure 4] FIG. 4 is a diagram illustrating a detailed configuration of the DSP. [Figure 5] FIG. 5 is a flowchart illustrating the processing of the in-vehicle audio display device according to this embodiment. [Figure 6] FIG. 6 is a flowchart illustrating the details of the process in the step of changing the sound settings. [Figure 7] FIG. 7 is a diagram illustrating an example (part 1) of the rotation of the display panel 30. In FIG. [Figure 8] FIG. 8 is a diagram illustrating an example (part 2) of the rotation of the display panel 30. In FIG. [Figure 9] FIG. 9 is a diagram illustrating an example (part 3) of the rotation of the display panel 30. In FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] The acoustic control device and acoustic control method of the present disclosure will be described below with reference to the drawings.

[0011] <Embodiment> (System Configuration) Fig. 1 is a diagram illustrating the configuration of an in-vehicle audio display device as an example of an audio control device according to an embodiment, and Fig. 2 is a diagram illustrating the arrangement of each part of the in-vehicle audio display device within a vehicle.

[0012] The in-vehicle audio display device 1 is, for example, a device called an RSE that is mounted on a vehicle 60. The RSE provides content such as television broadcasts, video, and sound played from media such as Digital Versatile Discs (DVDs) to passengers in the rear seats of the vehicle. Such content is provided to the RSE from an external device. The external device may be, for example, a navigation device mounted on the vehicle 60. Alternatively, the external device may be a smartphone or tablet device of the passenger.

[0013] In this embodiment, vehicle 60 is, for example, a seven-seater minivan, and includes three rows of seats 61 to 67 arranged in the front-to-rear direction of vehicle 60 (direction in FIG. 2) within the cabin. Of seats 61 to 67, first-row seats 61 and 62 are front seats, and second-row seats 63 and 64 and third-row seats 65 to 67 are rear seats. First-row seats 61 and 62 are arranged side by side in the left-to-right direction of vehicle 60 (x direction in FIG. 2), which is perpendicular to the front-to-rear direction. Second-row seats 63 and 64 and third-row seats 65 to 67 are also arranged side by side in the left-to-right direction.

[0014] The in-vehicle audio display device 1 includes a base 10, a rotation mechanism 20, a display panel 30, second-row seat speakers 41 and 42, and third-row seat speakers 51 and 52.

[0015] The in-vehicle audio display device 1 includes a base 10, a rotation mechanism 20, and a display panel 30. The combined display device is a display device for providing images to passengers in the rear seats. As shown in Fig. 2, this display device is arranged between first-row seats 61, 62 and second-row seats 63, 64 in the front-rear direction, and between seats 63 and 64 in the left-right direction. The base 10, rotation mechanism 20, and display panel 30 are installed on the ceiling at the top of the vehicle interior in the up-down direction of the vehicle 60 (see the z direction in Figs. 7 to 9), which is perpendicular to the front-rear and left-right directions.

[0016] 3 is a diagram illustrating the appearance of the base 10, the rotation mechanism 20, and the display panel 30 of the in-vehicle audio display device 1. In FIG. 3, the display panel 30 is shown in an open state relative to the base 10.

[0017] The base 10 supports the display panel 30 and has a substantially rectangular parallelepiped housing. The housing of the base 10 is fixed to the ceiling of the vehicle interior. Electronic devices for driving the display panel 30, which will be described later, are provided within the housing of the base 10. The base 10 has a width direction (x direction in FIG. 3 ) that corresponds to the left-right direction of the vehicle 60, a depth direction (y direction in FIG. 3 ) that corresponds to the front-rear direction of the vehicle 60, and a thickness direction (z direction in FIG. 3 ) that is perpendicular to the width direction and the depth direction and corresponds to the up-down direction of the vehicle 60. A lock 10a is provided at one end of the base 10 in the depth direction and at the center of the width direction to hold the display panel 30 when the display panel 30 is closed relative to the base 10. A rotation mechanism 20 is provided as part of the base 10 at the other end of the base 10 in the depth direction and at both ends of the base 10 in the width direction.

[0018] The rotation mechanism 20 rotates the display panel 30 and includes a rotation shaft, a drive motor, various gears, a clutch, and the like. The rotation mechanism 20 supports the display panel 30 by sandwiching it in the width direction of the base 10. The rotation mechanism 20 rotates each part of the display panel 30 within the yz plane in FIG. 3 around a rotation shaft extending in the width direction of the base 10. This allows the display panel 30 to be changed from a state in which the display panel 30 overlaps the base 10 and is closed relative to the base 10 to a state in which the display panel 30 is tilted toward the rear seats in the vehicle interior or downward relative to the base 10, as shown in FIG. 3, and is open relative to the base 10. In other words, the angle of the display panel 30 relative to the base 10 is changeable. Therefore, it can be said that the display panel 30 is supported by the base 10 by the rotation mechanism 20 so that its angle relative to the base 10 can be changed.

[0019] The state in which the display panel 30 is closed can be said to be the state in which the display device is folded. Therefore, the combination of the base 10, the rotation mechanism 20, and the display panel 30 can be said to be a foldable display device. In addition, since the combination of the base 10, the rotation mechanism 20, and the display panel 30 is suspended from the ceiling in the vehicle cabin, it can also be said to be a hanging display device.

[0020] The display panel 30 has a substantially rectangular parallelepiped housing and a display unit 31, such as an organic electroluminescent display (OLED) or a liquid crystal display (LCD), incorporated in the housing. A display surface 31a of the display unit 31 faces the base 10 (the ceiling of the vehicle 60) when the display panel 30 is closed, and faces the passengers in the rear seats of the vehicle 60 when the display panel 30 is open (see FIGS. 7B and 7C).

[0021] Furthermore, as shown in FIG. 1, the display panel 30 has an actuator 32. The actuator 32 is for outputting sound by vibrating the display unit 31, and is disposed on the side opposite the display surface 31a of the display unit 31 inside the housing of the display panel 30. The actuator 32 is fixed to the side opposite the display surface 31a by, for example, an adhesive. The actuator 32 is, for example, a piezo element (piezoelectric element). Alternatively, the actuator 32 may be a The actuator 32 may be a vibration element such as a solenoid. In this embodiment, the actuator 32 and the display unit 31 configure a display panel type speaker of the display panel 30. The display panel type speaker is an example of a first speaker.

[0022] The display panel 30 also has an angle sensor 33. The angle sensor 33 is for detecting the angle of the display panel 30 relative to the base 10 and is disposed inside the housing of the display panel 30. The angle sensor 33 is, for example, a gyro sensor (a rotational mechanical acceleration sensor). Alternatively, the angle sensor 33 may be a vibration acceleration sensor. The angle sensor 33 may also be a rotary encoder. The angle sensor 33 outputs a detection signal indicating the detected angle of the display panel 30 to the control unit 13, which will be described later. The angle sensor 33 is an example of an angle detector.

[0023] Furthermore, the second-row seat speakers 41, 42 of the in-vehicle audio display device 1 are speakers for providing audio mainly to occupants in the second-row seats 63, 64. The second-row seat speakers 41, 42 are installed on the sides of the vehicle interior near the second-row seats 63, 64, as shown in FIG. 2 . Specifically, the second-row seat speakers 41, 42 are installed between the first-row seats 61, 62 and the second-row seats 63, 64 in the longitudinal direction of the vehicle 60, and on the sides of the vehicle interior to the right of the right-side seat 63 and to the left of the left-side seat 64 in the lateral direction. Furthermore, the third-row seat speakers 51, 52 are speakers for providing audio mainly to occupants in the third-row seats 65-67. The third-row seat speakers 51, 52 are installed on the sides of the vehicle interior near the third-row seats 65, 67. Specifically, the third-row seat speakers 51, 52 are installed on the sides of the vehicle interior between the second-row seats 63, 64 and the third-row seats 65-67 in the front-rear direction, and to the right of the right-side seat 65 and to the left of the left-side seat 67 in the left-right direction. Hereinafter, the second-row seat speakers 41, 42 and the third-row seat speakers 51, 52 will also be collectively referred to as vehicle speakers. The vehicle speaker is an example of a second speaker that is different from the first speaker.

[0024] Next, the electronic devices for driving the display panel 30, which are provided within the housing of the base 10, will be described with reference to Fig. 1. The housing of the base 10 includes a signal input unit 11, an operation unit 12, a control unit 13, an auxiliary storage unit 14, a rotation drive circuit 15, a display drive circuit 16, a digital signal processor (DSP) 17, D / A converters 18a to 18c, and amplifiers 19a to 19c.

[0025] The signal input unit 11 receives video signals, audio signals, etc. of content output from an external device such as a navigation device, and outputs them to the control unit 13. The signal input unit 11 is an input terminal into which a cable such as a High-Definition Multimedia Interface (HDMI: registered trademark) or a Universal Serial Bus (USB) is inserted.

[0026] The operation unit 12 recognizes input operations made by the user on the in-vehicle audio display device 1 and outputs signals corresponding to the input operations to the control unit 13. Input operations include, for example, turning the power of the in-vehicle audio display device 1 on and off, setting the attitude of the display panel 30 (the angle of the display panel 30 relative to the base 10) including opening and closing, switching the content to be output to the display panel 30, adjusting the image quality, adjusting the volume, etc. The operation unit 12 is, for example, a remote controller, input buttons, input levers, a touch panel, or a combination of these.

[0027] The control unit 13 includes, for example, a central processing unit (CPU) and a main memory unit. The CPU executes a computer program that has been loaded in an executable manner into the main memory, and provides the functions of the in-vehicle audio display device 1. The main memory stores the computer program that the CPU executes, the data that the CPU processes, etc. The CPU is also called a processor. However, the CPU is not limited to a single processor, and may be configured as a multi-processor. The CPU may be a single processor connected via a single socket and may have a multi-core configuration. Through these processes, the control unit 13 receives operations from the user, i.e., an occupant, via the operation unit 12 and provides the user with various functions in response to the user's operations. For example, when the control unit 13 receives an operation from the user regarding the attitude of the display panel 30 via the operation unit 12, the control unit 13 outputs a rotation command signal regarding the attitude of the display panel 30 to the rotation drive circuit 15. When the control unit 13 receives an operation from the user regarding content switching, the control unit 13 outputs a video signal of the switched content to the display drive circuit 16 and outputs an audio signal of the content to the DSP 17.

[0028] Furthermore, the control unit 13 receives the angle of the display panel 30 detected by the angle sensor 33 and changes the acoustic settings of the audio signals to be output to the display panel speaker and the vehicle speaker according to the angle. When changing the acoustic settings, the control unit 13 generates a change signal including appropriate values ​​for the acoustic settings according to the angle of the display panel 30 based on a table of acoustic settings stored in the auxiliary storage unit 14 (described later), and outputs the change signal to the DSP 17.

[0029] The auxiliary storage unit 14 stores various parameters related to the attitude of the display panel 30, audio output, etc. For example, the auxiliary storage unit 14 stores the angle value of the display panel 30 relative to the base 10 for the standard second-row seats 63, 64, and the angle value of the display panel 30 relative to the base 10 for the standard third-row seats 65 to 67.

[0030] Here, the standard angle for the second-row seats 63, 64 refers to an angle (e.g., 90° + 20°) at which the display panel 30 faces the average head height of occupants in the second-row seats 63, 64. In other words, the angle for the second-row seats 63, 64 refers to an angle at which a line extending normal to the center of the display panel in a plan view passes through the head positions of occupants in the second-row seats 63, 64 when the vehicle 60 is viewed from the side. However, the angle for the second-row seats 63, 64 does not need to exactly match the angle at which the display panel 30 faces the average head height of occupants in the second-row seats 63, 64. The angle for the second-row seats 63, 64 may deviate within a certain range (e.g., approximately ±20°) from the angle at which the display panel 30 faces the average head height of occupants in the second-row seats 63, 64. Furthermore, the standard angle for the third-row seats 65 to 67 refers to an angle (e.g., vertical) at which the display panel 30 faces the average head height of the occupants of the third-row seats 65 to 67. In other words, the angle for the third-row seats 65 to 67 refers to an angle at which a line extending normal to the center of the display panel 30 in a plan view passes through the head positions of the occupants of the third-row seats 65 to 67 when the vehicle 60 is viewed from the side. However, the angle for the third-row seats 65 to 67 does not need to exactly match the angle at which the display panel 30 faces the average head height of the occupants of the third-row seats 65 to 67. The angle for the third-row seats 65 to 67 may deviate within a certain range (e.g., approximately ±20°) from the angle at which the display panel 30 faces the average head height of the occupants of the third-row seats 65 to 67.

[0031] The auxiliary storage unit 14 also stores a table of appropriate acoustic settings for each predetermined angle (e.g., 5°) of the display panel 30 for each of the display panel speaker and the vehicle speaker. The acoustic settings are settings for gain, phase, delay, and frequency characteristics for the audio output from the display panel speaker and the vehicle speaker. The appropriate acoustic settings are values ​​determined based on, for example, the results of acoustic measurements performed within the vehicle cabin for each vehicle model. Here, an example will be described in which a support shaft (also called a hinge) for opening and closing the display panel 30 is located on the front side of the vehicle 60 relative to the base 10. For example, with regard to the appropriate gain value, the closer the angle of the display panel 30 relative to the base 10 is to an angle (e.g., vertical) for the third-row seats 65 to 67, the larger the gain value of the audio signal output to the display panel speaker. Furthermore, the angle of the display panel 30 is changed from the angle for the third row seats 65 to 67 to the angle for the second row seats 63, 64 (for example, 90°+ As the angle of the display panel 30 approaches the angle for the third row seats 65-67 (20°), the gain value of the audio signal output to the display panel type speakers decreases. Also, as the angle of the display panel 30 approaches the angle for the third row seats 65-67, the gain value of the audio signal output to the third row seat speakers 51, 52 increases. Furthermore, as the angle of the display panel 30 approaches the angle for the second row seats 63, 64 from the angle for the third row seats 65-67, the gain value of the audio signal output to the second row seat speakers 42, 42 increases as the display panel 30 opens. The auxiliary storage unit 14 is, for example, a flash memory. Alternatively, it may be a memory device called an electrically erasable programmable read-only memory (EEPROM). It may be a general nonvolatile memory that is widely used.

[0032] When rotation drive circuit 15 receives a rotation command signal from control unit 13, it generates a command value related to the rotation of display panel 30 based on the rotation command signal. Rotation drive circuit 15 also includes an amplifier, which amplifies the command value via the amplifier to generate a rotation drive signal and outputs it to rotation mechanism 20. As a result, rotation mechanism 20 rotates display panel 30 to a position corresponding to the user's operation related to the position of display panel 30.

[0033] Display drive circuit 16 receives a video signal from control unit 13, generates a display drive signal for driving display unit 31 of display panel 30 based on the video signal, and outputs the signal to display unit 31. As a result, display unit 31 displays an image.

[0034] The DSP 17 receives an audio signal from the control unit 13 and performs predetermined processing on the audio signal (see, for example, Patent Document 2).

[0035] FIG. 4 is a diagram illustrating a detailed configuration of the DSP 17. As shown in FIG. 4, the DSP 17 includes a gain adjustment circuit 17a, a phase adjustment circuit 17b, a delay adjustment circuit 17c, a left-right balance adjustment circuit 17d, and a frequency characteristic adjustment circuit 17e. The gain adjustment circuit 17a adjusts the gain of the audio output from the display panel speaker and the vehicle speaker. The phase adjustment circuit 17b adjusts the phase of the audio output from the display panel speaker and the vehicle speaker. The delay adjustment circuit 17c adjusts the delay of the audio output from the display panel speaker and the vehicle speaker. The left-right balance adjustment circuit 17d adjusts the left-right balance of the audio output from the display panel speaker and the vehicle speaker. The frequency characteristic adjustment circuit 17e adjusts the frequency characteristics of the audio output from the display panel speaker and the vehicle speaker. The DSP 17 performs predetermined acoustic adjustment processing on the audio signals in these adjustment circuits 17a to 17e to generate audio processed signals, and outputs the audio processed signals to the D / A converters 18a to 18c. In addition to these adjustment circuits 17a to 17e, the DSP 17 also includes a Finite Impulse Response (FIR) filter for performing filtering, a split audio signal for performing various processing, and a digital-to-analog converter (D / A) for converting the audio signals into digital signals. The signal processing circuit may include an adder circuit for adding:

[0036] Furthermore, when the DSP 17 receives a change signal from the control unit 13, it performs acoustic settings on the audio signal based on appropriate acoustic setting values ​​included in the change signal to generate audio processed signals and output them to the D / A converters 18a to 18c.

[0037] The D / A converters 18a to 18c convert the audio processing signals, which are digital signals, into analog signals and output them to the amplifiers 19a to 19c. The amplifier 19a amplifies the analog signal to generate an actuator drive signal and outputs it to the actuator 32. The actuator 32 drives the display unit 31 in accordance with the actuator drive signal, causing the display unit 31 to vibrate. As a result, sound is output from the display unit 31. The amplifier 19b amplifies the analog signal and outputs it to the second-row seat speakers 41 and 42. As a result, sound is output from the second-row seat speakers 41 and 42. Furthermore, the amplifier 19c amplifies the analog signal and outputs it to the third-row seat speakers 51 and 52. As a result, the third-row seat speakers Audio is output from 51 and 52.

[0038] (Processing flow) Fig. 5 is a flowchart illustrating the processing of the in-vehicle audio display device 1 in this embodiment. Fig. 6 is a flowchart illustrating the details of the processing in the step of changing audio settings. These processes are executed by the control unit 13.

[0039] In this process, when the display panel 30 is closed relative to the base 10, the control unit 13 first determines whether the display panel 30 is open (S11). In detail, when the control unit 13 receives an operation related to the attitude of the display panel 30 from the user via the operation unit 12, the control unit 13 releases the lock 10a of the base 10. When the control unit 13 detects that the lock 10a has been released, the control unit 13 determines that the display panel 30 is open.

[0040] Furthermore, control unit 13 outputs a rotation command signal related to the attitude of display panel 30 to rotation drive circuit 15. Upon receiving the rotation command signal from control unit 13, rotation drive circuit 15 generates a rotation drive signal based on the rotation command signal and outputs the signal to rotation mechanism 20. Upon receiving the rotation drive signal from rotation drive circuit 15, rotation mechanism 20 rotates display panel 30 to an attitude corresponding to an operation related to the attitude of display panel 30 based on the rotation drive signal.

[0041] If the judgment in S11 is that the display panel 30 is open (judgment of YES), the control unit 13 detects that the rotation of the display panel 30 has stopped, and then receives a detection signal from the angle sensor 33 and detects the angle of the display panel 30 relative to the base 10 (S12).

[0042] Next, the control unit 13 changes the acoustic settings of the audio signals to be output to the display panel speaker and the vehicle speaker in accordance with the angle of the display panel 30 (S13). The process of changing the acoustic settings will be described in detail later.

[0043] After changing the sound settings, the control unit 13 determines whether the display panel 30 has rotated (S14). More specifically, when the control unit 13 receives an operation related to the attitude of the display panel 30 from the user via the operation unit 12, the control unit 13 outputs a rotation command signal related to the attitude of the display panel 30 to the rotation drive circuit 15, as in S11. As a result, the rotation mechanism 20 rotates the display panel 30 to an attitude corresponding to the operation related to the attitude of the display panel 30. This causes the control unit 13 to determine that the display panel 30 has rotated.

[0044] If the determination in S14 is that the display panel 30 has rotated (determination of YES), the control unit 13 detects that the rotation of the display panel 30 has stopped, and then determines whether the display panel 30 has closed (S15). In detail, when the control unit 13 detects that the display panel 30 has closed and the lock 10a of the base 10 has engaged, it determines that the display panel 30 has closed.

[0045] If the determination in S15 is that the display panel 30 is not closed (determination of NO), the process proceeds to S12, where the control unit 13 receives a detection signal from the angle sensor 33 and detects the angle of the display panel 30 with respect to the base 10. Then, the control unit 13 changes the acoustic settings of the audio signals to be output to the display panel speaker and the vehicle speaker according to the angle of the display panel 30 (S13).

[0046] On the other hand, if the determination in S15 is that the display panel 30 is closed (determination of YES), the control unit 13 ends the process related to the sound setting change.

[0047] Next, the details of the process for changing the sound settings in S13 will be described with reference to Figs. 7 to 9. Figs. 7 to 9 are diagrams each illustrating an example of rotation of the display panel 30. Fig. 7(A) 7(B) shows a state in which the display panel 30 is closed relative to the base 10, with the angle of the display panel 30 relative to the base 10 being nearly horizontal. FIG. 7(B) shows a state in which the display panel 30 is open, with the angle of the display panel 30 relative to the base 10 being an angle (e.g., vertical) that directly faces the heads of the occupants 71 in the third-row seats 65-67. That is, FIG. 7(B) shows a state in which the display panel 30 is in a standard angle (position) for the third-row seats 65-67. In this position of the display panel 30, the display surface 31a faces toward the rear of the vehicle 60, making it easy for the occupants 71 in the third-row seats 65-67 to view the image. FIG. 7(C) shows a state in which the display panel 30 is further opened, with the angle of the display panel 30 relative to the base 10 exceeding the angle for the third-row seats 65-67. Specifically, the display panel 30 is angled (e.g., 90° + 20°) so that it faces the head of the occupant 72 seated in the second-row seats 63, 64. That is, FIG. 7C shows the display panel 30 at a standard angle (position) for the second-row seats 63, 64. In this position of the display panel 30, the display surface 31a of the display unit 31 faces diagonally downward, making it easy for the occupant 72 seated in the second-row seats 63, 64 to view the image. Similarly to FIG. 7A, FIGS. 8A and 9B show the display panel 30 in a standard position for the third-row seats 65-67. Similarly to FIG. 7B, FIGS. 8B and 9A show the display panel 30 in a standard position for the second-row seats 63, 64.

[0048] In this process, after detecting the angle of the display panel 30 relative to the base 10 in S12, as shown in FIG. 6A, the control unit 13 first determines whether the angle of the display panel 30 after rotation is for the third-row seats 65-67 (S21). In detail, the control unit 13 compares the detected angle value of the display panel 30 with the angle value of the display panel 30 for the third-row seats 65-67 stored in the auxiliary storage unit 14, and determines whether the angle of the display panel 30 after rotation is for the third-row seats 65-67. If the determination in S21 is that the angle of the display panel 30 after rotation is not for the third-row seats 65-67 (NO determination), the process proceeds to S31 in FIG. 6B.

[0049] On the other hand, if the determination in S21 is that the angle of the display panel 30 after rotation is for the third-row seats 65 to 67 (determination of YES), the control unit 13 determines whether the display panel 30 before rotation was closed or not (S22). In detail, the control unit 13 stores the angle of the display panel 30 before rotation, and determines whether the display panel 30 before rotation was closed or not based on the stored angle of the display panel 30.

[0050] If the determination in S22 is that the display panel 30 was closed before rotation (YES determination), the control unit 13 increases the gain of the audio signal output to the display panel speaker (S23). The closer the angle of the display panel 30 with respect to the base 10 is to the angle for the third-row seats 65-67, the greater the gain of the audio signal output to the display panel speaker. Here, the angle for the third-row seats 65-67 refers to an angle (e.g., vertical) at which the display panel 30 faces the head of the occupant 71 in the third-row seats 65-67. In this case, the display panel 30 has changed from the closed state shown in FIG. 7(A) to the open state shown in FIG. 7(B), and the angle of the display panel 30 is closer to the angle for the third-row seats 65-67 than before rotation. Therefore, the control unit 13 increases the gain of the audio signal output to the display panel speaker compared to before rotation. Specifically, the control unit 13 changes the gain value for the display panel speaker according to the angle of the display panel 30 before rotation to the gain value for the display panel speaker according to the angle of the display panel 30 after rotation, based on the table stored in the auxiliary storage unit 14. Then, the control unit 13 generates a change signal including the gain value for the display panel speaker according to the angle of the display panel 30 after rotation, and outputs the change signal to the DSP 17.

[0051] As a result, the DSP 17 increases the gain of the audio signal in the gain adjustment circuit 17a based on the gain value for the display panel speaker included in the modification signal to generate an audio processing signal, and outputs the audio processing signal to the D / A converter 18a. As a result, audio at a relatively high volume is output from the display panel speaker (display unit 31 and actuator 32). This makes it possible to provide audio at an appropriate volume to the occupants 71 in the third row seats 65-67, who are relatively far from the display panel 30.

[0052] Next, the control unit 13 increases the gain of the audio signals output to the third-row seat speakers 51, 52 of the vehicle speakers (S24). The closer the angle of the display panel 30 with respect to the base 10 is to the angle for the third-row seats 65-67, the greater the gain of the audio signals output to the third-row seat speakers 51, 52. In this case, because the angle of the display panel 30 is closer to the angle for the third-row seats 65-67 than before rotation, the control unit 13 increases the gain of the audio signals output to the third-row seat speakers 51, 52 compared to before rotation. Specifically, the control unit 13 adjusts the gain of the audio signals based on the table in the auxiliary storage unit 14. That is, the gain value for the third-row seat speakers 51, 52 corresponding to the angle of the display panel 30 before rotation is changed to the gain value for the third-row seat speakers 51, 52 corresponding to the angle of the display panel 30 after rotation. Then, the control unit 13 generates a change signal including a gain value for the third row seat speakers 51 and 52 according to the angle of the display panel 30 after rotation, and outputs the change signal to the DSP 17.

[0053] As a result, the DSP 17 increases the gain of the audio signal in the gain adjustment circuit 17a based on the gain value for the third-row seat speakers 51, 52 included in the change signal to generate an audio processing signal and output the audio processing signal to the D / A converter 18c. As a result, audio at a relatively high volume is output from the third-row seat speakers 51, 52. This makes it possible to provide audio at an appropriate volume to the occupants 71 in the third-row seats 65-67.

[0054] On the other hand, if the determination in S22 is that the display panel 30 is not closed before rotation (NO determination), that is, if the angle of the display panel 30 before rotation is the angle for the second-row seats 63, 64, the control unit 13 increases the gain of the audio signal output to the display panel speaker (S25). Here, the angle for the second-row seats 63, 64 refers to an angle (e.g., 90° + 20°) at which the display panel 30 faces directly the head of the occupant 71 in the second-row seats 65-67. In this case, the display panel 30 changes from the state in which it is opened for the second-row seats 63, 64 as shown in FIG. 9A to the state in which it is opened for the third-row seats 65-67 as shown in FIG. 9B, and the angle of the display panel 30 is closer to the angle for the third-row seats 65-67 than before rotation. Therefore, the control unit 13 increases the gain of the audio signal output to the display panel speaker compared to before rotation. Then, the control unit 13 generates a modification signal including a gain value for the display panel speaker according to the angle of the display panel 30 after rotation, and outputs the modification signal to the DSP 17.

[0055] As a result, the DSP 17 increases the gain of the audio signal in the gain adjustment circuit 17a based on the gain value for the display panel speaker included in the change signal to generate an audio processing signal, and outputs the signal to the D / A converter 18a. As a result, audio at a volume louder than before the rotation is output from the display panel speaker. This makes it possible to provide audio at an appropriate volume to the occupants 71 in the third row seats 65-67, who are relatively far from the display panel 30.

[0056] Next, the control unit 13 reduces the gain of the audio signal output to the second-row seat speakers 41, 42 among the vehicle speakers (S26). For example, the control unit 13 minimizes the gain of the audio signal output to the second-row seat speakers 41, 42. The control unit 13 then generates a change signal including the value of the minimized gain for the second-row seat speakers 41, 42, and outputs the change signal to the DSP 17.

[0057] As a result, the DSP 17 generates an audio processing signal by minimizing the gain of the audio signal in the gain adjustment circuit 17a based on the gain value for the second-row seat speakers 41, 42 included in the change signal, and outputs the audio processing signal to the D / A converter 18b. As a result, almost no audio is output from the second-row seat speakers 41, 42. This prevents the occupant 72 from feeling uncomfortable when hearing audio intended for the occupant 71 in the third-row seats 65-67, even if the occupant 72 is in the second-row seats 63, 64.

[0058] Furthermore, the control unit 13 increases the gain of the audio signal to be output to the third-row seat speakers 51, 52 (S27). Then, the control unit 13 generates a modification signal including a gain value for the third-row seat speakers 51, 52 according to the angle of the display panel 30 after rotation, and outputs the modification signal to the DSP 17.

[0059] As a result, the DSP 17 increases the gain of the audio signal based on the gain value for the third-row seat speakers 51, 52 included in the change signal, generates an audio processing signal, and outputs the audio processing signal to the D / A converter 18c. As a result, audio at a relatively high volume is output from the third-row seat speakers 51, 52. This makes it possible to provide audio at an appropriate volume to the occupants 71 in the third-row seats 65-67.

[0060] If the determination in S21 is that the angle of the display panel 30 after rotation is not for the third row seats 65 to 67 (NO determination), that is, for the second row seats 63, 64, as shown in Figure 6 (B), the control unit 13 determines whether the display panel 30 before rotation was closed (S31).

[0061] If the determination in S31 is that the display panel 30 was closed before rotation (YES determination), the control unit 13 increases the gain of the audio signal output to the display panel speaker within a range smaller than that of S23 (S32). In this case, the display panel 30 changes from the closed state shown in FIG. 7A to the open state shown in FIG. 7C for the second-row seats 63 and 64, and the angle of the display panel 30 is closer to the angle for the third-row seats 65-67 than before rotation. However, compared to the state shown in FIG. 7B for the third-row seats 65-67, the angle of the display panel 30 has exceeded the angle for the third-row seats 65-67 and is now open to the angle for the second-row seats 63 and 64. Therefore, the control unit 13 increases the gain of the audio signal output to the display panel speaker within a range smaller than that of S23. Then, the control unit 13 generates a modification signal including a gain value for the display panel speaker according to the angle of the display panel 30 after rotation, and outputs the modification signal to the DSP 17.

[0062] As a result, the DSP 17 increases the gain of the audio signal in the gain adjustment circuit 17a based on the gain value for the display panel speaker included in the modification signal to generate an audio processing signal and output the signal to the D / A converter 18a. As a result, audio at a relatively high volume is output from the display panel speaker, although the volume is lower than the volume of the audio output as a result of S23. This makes it possible to provide audio at an appropriate volume to the occupants 72 in the second-row seats 63, 64, who are relatively close to the display panel 30.

[0063] Next, the control unit 13 increases the gain of the audio signal output to the second-row seat speakers 41, 42 (S33). The closer the angle of the display panel 30 with respect to the base 10 is to the angle for the third-row seats 65 to 67, the greater the gain of the audio signal output to the second-row seat speakers 41, 42. In this case, since the angle of the display panel 30 is closer to the angle for the third-row seats 65 to 67 than before the rotation, the control unit 13 increases the gain of the audio signal output to the second-row seat speakers 41, 42 compared to before the rotation. Specifically, the control unit 13 calculates the gain of the audio signal based on the table stored in the auxiliary storage unit 14. The control unit 13 adjusts the gain. That is, the control unit 13 changes the gain value for the second-row seat speakers 41, 42 that corresponds to the angle of the display panel 30 before rotation to the gain value for the second-row seat speakers 41, 42 that corresponds to the angle of the display panel 30 after rotation. The control unit 13 then generates a change signal that includes the gain value for the second-row seat speakers 41, 42 that corresponds to the angle of the display panel 30 after rotation, and outputs the change signal to the DSP 17.

[0064] As a result, the DSP 17 increases the gain of the audio signal in the gain adjustment circuit 17a based on the gain value for the second-row seat speakers 41, 42 included in the change signal, generates an audio processing signal, and outputs the audio processing signal to the D / A converter 18b. As a result, audio at a relatively high volume is output from the second-row seat speakers 41, 42. This makes it possible to provide audio at an appropriate volume to the occupants 72 in the second-row seats 63, 64.

[0065] On the other hand, if the determination in S31 is that the display panel 30 before rotation is not closed (NO determination), that is, if the angle of the display panel 30 before rotation is for the third-row seats 65-67, the control unit 13 reduces the gain of the audio signal output to the display-panel speaker (S34). The control unit 13 reduces the gain of the audio signal output to the display-panel speaker as the angle of the display panel 30 with respect to the base 10 approaches the angle for the second-row seats 63, 64 from the angle for the third-row seats 65-67 as shown in FIG. 8(A) to the state where the display panel 30 is open for the second-row seats 63, 64 as shown in FIG. 8(B). That is, the angle of the display panel 30 exceeds the angle for the third-row seats 65-67 from before rotation, and opens to the angle for the second-row seats 63, 64. Therefore, the control unit 13 reduces the gain of the audio signal to be output to the display panel speaker compared to before the rotation. Then, the control unit 13 generates a modification signal including a gain value for the display panel speaker according to the angle of the display panel 30 after the rotation, and outputs the modification signal to the DSP 17.

[0066] As a result, the DSP 17 reduces the gain of the audio signal in the gain adjustment circuit 17a based on the gain value for the display panel speaker included in the modification signal to generate an audio processing signal, and outputs the audio processing signal to the D / A converter 18a. As a result, audio at a relatively low volume is output from the display panel speaker. This makes it possible to provide audio at an appropriate volume to the occupants 72 in the second-row seats 63, 64 who are relatively close to the display panel 30.

[0067] Next, the control unit 13 reduces the gain of the audio signal output to the third-row seat speakers 51, 52 among the vehicle speakers (S35). For example, the control unit 13 minimizes the gain output to the third-row seat speakers 51, 52. The control unit 13 then generates a change signal including the value of the minimized gain for the third-row seat speakers 51, 52, and outputs the change signal to the DSP 17.

[0068] As a result, the DSP 17 generates an audio processing signal by minimizing the gain of the audio signal in the gain adjustment circuit 17a based on the gain value for the third-row seat speakers 51, 52 included in the change signal, and outputs the audio processing signal to the D / A converter 18c. As a result, almost no audio is output from the third-row seat speakers 51, 52. This prevents the occupant 71 from feeling uncomfortable when hearing audio intended for the occupant 72 in the second-row seats 63, 64, even if the occupant 71 is in the third-row seats 65-67.

[0069] Furthermore, the control unit 13 increases the gain of the audio signals output to the second-row seat speakers 41, 42 compared to before the rotation (S36). The control unit 13 increases the gain of the audio signals output to the second-row seat speakers 41, 42 as the angle of the display panel 30 with respect to the base 10 approaches the angle for the second-row seats 63, 64 from the angle for the third-row seats 65-67. In this case, as described above, when the angle of the display panel 30 approaches the angle for the third-row seats 63, 64 compared to before the rotation, The display panel 30 is opened beyond the angle for seats 5 to 67 and to the angle for the second-row seats 63, 64. Therefore, the control unit 13 increases the gain of the audio signals output to the second-row seat speakers 41, 42 compared to before the rotation. The control unit 13 then generates a change signal including a gain value for the second-row seat speakers 41, 42 that corresponds to the angle of the display panel 30 after the rotation and outputs the change signal to the DSP 17.

[0070] As a result, the DSP 17 increases the gain of the audio signal based on the gain value for the second-row seat speakers 41, 42 included in the change signal, generates an audio processing signal, and outputs the audio processing signal to the D / A converter 18b. As a result, audio at a relatively high volume is output from the second-row seat speakers 41, 42. This makes it possible to provide audio at an appropriate volume to the occupants 72 in the second-row seats 63, 64.

[0071] In the acoustic setting change in S13 described above, only the gain setting was changed, but the acoustic setting change is not limited to this. In this embodiment, it is sufficient to change at least one setting among the gain, phase, delay amount, and frequency characteristics of the audio signal. For example, in addition to the gain, the delay amount setting may also be changed. This makes it possible to provide audio with more appropriate sound quality to the occupants 72 in the second-row seats 63, 64 or the occupants 71 in the third-row seats 65-67. Alternatively, only the delay amount setting may be changed.

[0072] Furthermore, the display panel 30 has been illustrated as being able to open in two stages, i.e., for the second-row seats 63, 64 and for the third-row seats 65-67, but is not limited thereto. For example, the angle of the display panel 30 for the standard second-row seats 63, 64 and the standard third-row seats 65-67 may be changed to accommodate a larger or smaller physique (mainly height) than that of a standard occupant. In this case, the angle of the display panel 30 may be adjusted from the angle of the display panel 30 for the standard second-row seats 63, 64 and the standard third-row seats 65-67 by a user's operation via the operation unit 12. In other words, the display panel 30 may be able to open in three or more stages. Then, the acoustic settings of the audio signals output to the display panel speaker and the vehicle speaker may be changed depending on the angle of the display panel 30 after rotation. This makes it possible to provide the passengers 72 in the second row seats 63, 64 or the passengers 71 in the third row seats 65 to 67 with audio of a more appropriate quality.

[0073] (Effects of the embodiment) As described above, the in-vehicle audio display device 1 of this embodiment changes the acoustic settings of the audio signal output to the display panel speaker (display unit 31 and actuator 32) in accordance with the angle of the display panel 30 detected by the angle sensor 33. This causes audio with sound quality in accordance with the angle of the display panel 30 to be output from the display panel speaker, thereby reducing the effect of the angle of the display panel 30 and providing audio with appropriate sound quality to the occupants 71, 72.

[0074] Furthermore, the in-vehicle audio display device 1 changes the acoustic settings of the audio signals output to the vehicle speakers (second-row seat speakers 41, 42 and third-row seat speakers 51, 52) in accordance with the angle of the display panel 30 detected by the angle sensor 33. This causes audio with sound quality according to the angle of the display panel 30 to be output from the vehicle speakers, thereby reducing the effect of the angle of the display panel 30 and providing audio with appropriate sound quality to the occupants 71, 72.

[0075] The acoustic setting is at least one setting of the gain, phase, delay amount, and frequency characteristics of the audio signal to be output to the display panel speaker or the vehicle speaker. As a result, for example, if the acoustic setting is a gain setting, audio with a gain (volume) according to the angle of the display panel 30 is output from the display panel speaker or the vehicle speaker. Therefore, the influence of the angle of the display panel 30 can be reduced, and sound at an appropriate volume can be provided to the passengers 71 and 72.

[0076] Furthermore, at least one of the acoustic settings of the audio signal output to the display panel speaker or the vehicle speaker is different depending on whether the angle of the display panel 30 is an angle for the second-row seats 63, 64 or an angle for the third-row seats 65-67. Here, the angle for the second-row seats 63, 64 refers to an angle (e.g., 90°+20°) at which the display panel 30 faces directly toward the head of the occupant 72 in the second-row seats 63, 64. Furthermore, the angle for the third-row seats 65-67 refers to an angle (e.g., vertical) at which the display panel 30 faces directly toward the head of the occupant 71 in the third-row seats 65-67. Furthermore, the at least one acoustic setting refers to at least one setting of gain, phase, delay amount, and frequency characteristics. As a result, for example, when the sound setting is a gain setting, sounds at appropriate volumes can be provided to the occupants 72 in the second row seats 63, 64 and the occupants 71 in the third row seats 65-67.

[0077] Specifically, the gain of the audio signal output to the display panel speaker is increased as the angle of the display panel 30 relative to the base 10 detected by the angle sensor 33 approaches the angle for the third row seats 65 to 67. This causes audio at a relatively high volume to be output from the display panel speaker, making it possible to provide audio at an appropriate volume to the occupants 71 in the third row seats 65 to 67 who are relatively far from the display panel 30.

[0078] Furthermore, the gain of the audio signal output to the display panel speaker is reduced as the angle of the display panel 30 approaches the angle for the second row seats 63, 64 from the angle for the third row seats 65-67. As a result, audio at a relatively high volume is output from the display panel speaker, although the volume is lower than when the angle of the display panel 30 is at an angle (for example, vertical) that directly faces the head of the occupant 71 in the third row seats 65-67. Therefore, audio at an appropriate volume can be provided to the occupant 72 in the second row seats 63, 64 who are relatively close to the display panel 30.

[0079] Furthermore, the closer the angle of the display panel 30 is to the angle for the third-row seats 65 to 67, the greater the gain of the audio signals output to the third-row seat speakers 51, 52 among the vehicle speakers. As a result, audio at a relatively high volume is output from the third-row seat speakers 51, 52, so that audio at an appropriate volume can be provided to the occupants 71 in the third-row seats 65 to 67.

[0080] Furthermore, the gain of the audio signals output to the second-row seat speakers 41, 42 is increased as the angle of the display panel 30 approaches the angle for the second-row seats 63, 64 from the angle for the third-row seats 65-67. As a result, audio at a relatively high volume is output from the second-row seat speakers 41, 42, and audio at an appropriate volume can be provided to the occupants 72 in the second-row seats 63, 64.

[0081] <Modification> In the above-described embodiment, an example has been described in which the support shaft for opening and closing the display panel 30 is located on the front side of the vehicle 60 in the base 10. That is, the display device has been described in which the display surface 31a of the display unit 31 faces the ceiling of the vehicle 60 when the display panel 30 is closed, and faces the passengers in the rear seats of the vehicle 60 when the display panel 30 is open. In this display device, as the display panel 30 opens, the display panel 30 first becomes angled for the third-row seats 65 to 67 (for example, vertical), and then becomes angled for the second-row seats 63, 64 (for example, 90° + 20°). However, the configuration and operation of the display device are not limited to this.

[0082] For example, the following example illustrates a case where the support shaft for opening and closing the display panel 30 is located on the rear side of the vehicle 60 in the base 10. That is, the display surface 31a of the display unit 31 may face the floor of the vehicle 60 when the display panel 30 is closed, and face the rear seat passengers of the vehicle 60 when the display panel 30 is open. As the display panel 30 opens, the display panel 30 may first be angled for the second row seats 63, 64 (e.g., 90°-20°), and then angled for the third row seats 65 to 67 (e.g., vertical). In the case of such a display device, the acoustic settings of the audio signals output to the display panel speaker and the vehicle speaker may be changed according to the angle of the display panel 30 detected by the angle sensor 33.

[0083] For example, the appropriate values ​​of the acoustic settings stored in the auxiliary storage unit 14, such as the appropriate gain values, may be set as follows: That is, the closer the angle of the display panel 30 with respect to the base 10 is to the angle for the second-row seats 63, 64, the greater the gain of the audio signal output to the display-panel type speaker. Furthermore, the closer the angle of the display panel 30 is from the angle for the second-row seats 63, 64 to the angle for the third-row seats 65-67, the greater the gain of the audio signal output to the display-panel type speaker. Furthermore, the closer the angle of the display panel 30 is to the angle for the second-row seats 63, 64, the greater the gain of the audio signal output to the second-row seat speakers 42. Furthermore, the closer the angle of the display panel 30 is to the angle for the third-row seats 65-67, the greater the gain of the audio signal output to the third-row seat speakers 51, 52. Here, the angle for the second-row seats 63, 64 refers to an angle (e.g., 90°-20°) at which the display panel 30 faces directly toward the heads of the occupants 72 in the second-row seats 63, 64. Furthermore, the angle for the third-row seats 65 to 67 refers to an angle (e.g., vertical) at which the display panel 30 faces directly toward the heads of the occupants 71 in the third-row seats 65 to 67.

[0084] Then, the control unit 13 uses the appropriate gain value stored in the auxiliary memory unit 14 to change the gain of the audio signal output to the display panel speaker and the vehicle speaker according to the angle of the display panel 30 relative to the base 10 detected by the angle sensor 33.

[0085] Specifically, the control unit 13 may increase the gain of the audio signal output to the display panel speaker as the angle of the display panel 30 approaches the angle for the second-row seats 63, 64. As a result, audio at a relatively high volume is output from the display panel speaker. This makes it possible to provide audio at an appropriate volume to the occupants 72 in the second-row seats 63, 64 who are relatively close to the display panel 30. Furthermore, the control unit 13 may increase the gain of the audio signal output to the display panel speaker as the angle of the display panel 30 approaches the angle for the third-row seats 65-67 from the angle for the second-row seats 63, 64. As a result, audio at a higher volume is output from the display panel speaker than when the angle of the display panel 30 is at the angle for the second-row seats 63, 64. This makes it possible to provide audio at an appropriate volume to the occupants 71 in the third-row seats 65-67 who are relatively far from the display panel 30.

[0086] Furthermore, the control unit 13 may increase the gain of the audio signals output to the second-row seat speakers 41, 42 as the angle of the display panel 30 approaches the angle for the second-row seats 63, 64. As a result, audio at a relatively high volume is output from the second-row seat speakers 41, 42. This allows audio at an appropriate volume to be provided to the occupants 72 in the second-row seats 63, 64.

[0087] Furthermore, the control unit 13 may increase the gain of the audio signals output to the third-row seat speakers 51, 52 as the angle of the display panel 30 approaches the angle for the third-row seats 65-67 from the angle for the second-row seats 63, 64. As a result, audio with a relatively high volume is output from the third-row seats 65-67. The sound is output from the third row seat speakers 51, 52. This makes it possible to provide sound at an appropriate volume to the occupants 72 in the third row seats 65-67.

[0088] In the above-described embodiment, the auxiliary storage unit 14 stores a table of appropriate acoustic setting values ​​corresponding to patterns of change in the angle of the display panel 30. However, the configuration of the table stored in the auxiliary storage unit 14 is not limited to this. For example, the auxiliary storage unit 14 may store a table of appropriate acoustic setting values ​​corresponding to a predetermined angular range of the display panel 30. Table 1 below shows an example of the configuration of a table of appropriate gain values ​​corresponding to a predetermined angular range of the display panel 30 relative to the base 10 for each of a display panel speaker and a vehicle speaker. Note that this assumes that the pivot for opening and closing the display panel 30 is located on the front side of the base 10 relative to the vehicle 60, and that the display surface 31a of the display unit 31 faces the ceiling of the vehicle 60 when the display panel 30 is closed. However, if the pivot for opening and closing the display panel 30 is located on the rear side of the base 10 relative to the vehicle 60, a table similar to Table 1 may be stored, although the angular range is different. The acoustic settings can be adjusted using a control panel. In Table 1, among the predetermined angle ranges, for example, the angle range from 80° to 100° is assumed to be the angle range for an occupant 71 in the third-row seats 65 to 67. Furthermore, the angle range from 100° to 130° is assumed to be the angle range for an occupant 72 in the second-row seats 63, 64. Furthermore, the angle range from 130° to 150° is assumed to be the angle range for a child occupant 72 in the second-row seats 63, 64. [Table 1]

[0089] The user operates the operation unit 12 regarding the attitude of the display panel 30, causing the display panel 30 to rotate from a closed state relative to the base 10 to an attitude specified by the user. In this case, after detecting that the rotation of the display panel 30 has stopped, the control unit 13 receives a detection signal from the angle sensor 33 and detects the angle of the display panel 30 relative to the base 10. Next, the control unit 13 uses the table shown in Table 1 to change the gain value to an appropriate gain value corresponding to an angle range including the detected angle of the display panel 30. The control unit 13 then generates a change signal including the appropriate gain value corresponding to the angle range including the detected angle of the display panel 30 and outputs the change signal to the DSP 17.

[0090] For example, if the detected angle of the display panel 30 is 85°, the control unit 13 may change the gain value to an appropriate gain value corresponding to the angle range of 80° to 100° shown in Table 1. That is, the control unit 13 may change the gain value for the display panel type speaker to "high volume." As a result, audio at a relatively high volume is output from the display panel type speaker, so audio at an appropriate volume can be provided to the occupants 71 in the third row seats 65 to 67, who are relatively far from the display panel 30. Furthermore, the control unit 13 may change the gain value for the third row seat speakers 51, 52 to "high volume." As a result, audio at a relatively high volume is output from the third row seat speakers 51, 52, so audio at an appropriate volume can be provided to the occupants 71 in the third row seats 65 to 67. Furthermore, the control unit 13 may change the gain value for the second row seat speakers 41, 42 to "high volume." The value can be changed to "low volume." As a result, audio at a relatively low volume is output from the second-row seat speakers 41, 42. This prevents the occupants 72 from feeling uncomfortable when they hear audio intended for the occupants 71 in the third-row seats 65-67, even if they are in the second-row seats 63, 64.

[0091] Moreover, the following Table 2 shows an example of the configuration of a table that lists appropriate values ​​of the delay amount and frequency characteristics for a predetermined angle range of the display panel 30 for a display panel type speaker. [Table 2]

[0092] As described above, after detecting that the rotation of the display panel 30 has stopped, the control unit 13 receives a detection signal from the angle sensor 33 and detects the angle of the display panel 30 with respect to the base 10. Next, the control unit 13 uses the table shown in Table 2 to change the values ​​of the delay amount and frequency characteristics to appropriate values ​​of the delay amount and frequency characteristics corresponding to an angle range including the detected angle of the display panel 30. The control unit 13 then generates a change signal including the appropriate values ​​of the delay amount and frequency characteristics corresponding to an angle range including the detected angle of the display panel 30, and outputs the change signal to the DSP 17.

[0093] For example, if the detected angle of the display panel 30 is 85°, the delay amount can be changed to an appropriate value for the delay amount corresponding to the angle range of 80° to 100° shown in Table 2, i.e., "-1." As a result, the sound output from the display panel speaker reaches the occupants 71 in the third-row seats 65-67 simultaneously with the sound output from the third-row seat speakers 51, 52, or slightly earlier than the sound output from the third-row seat speakers 51, 52. This causes the sound image to be localized toward the display panel 30 due to the precedence effect of the sound output from the display panel speaker, so that appropriate sound can be provided to the occupants 71 in the third-row seats 65-67. Furthermore, the delay amount can be changed to an appropriate value for the frequency characteristics corresponding to the angle range of 80° to 100°, i.e., "+3 dB in the range of 300 Hz-3 kHz." As a result, the sound output from the display panel speaker is slightly stronger in the band where sound is easily attenuated, that is, the band from 300 Hz to 3 kHz, so that the sound output from the display panel speaker can be clearly delivered to the occupants 71 in the third row seats 65 to 67. This makes it possible to provide appropriate sound to the occupants 71 in the third row seats 65 to 67.

[0094] In Table 2, the appropriate value of the delay amount corresponding to the angle range of 100° to 130° and the angle range of 130° to 150°, which are assumed to be the angle ranges for the occupant 72 in the second-row seats 63, 64, is "±0 ms." However, taking into consideration the precedence sound effect, the appropriate value of the delay amount corresponding to these angle ranges is also set for the occupant 72 in the second-row seats 63, 64. A positive value may be set. Furthermore, the optimum value of the frequency characteristics corresponding to the angle ranges of 100° to 130° and 130° to 150° is "no correction." However, optimum values ​​of the frequency characteristics corresponding to these angle ranges may also be set for the occupants 72 in the second-row seats 63, 64, taking into consideration the clarity of the voice.

[0095] Furthermore, optimum phase values ​​corresponding to predetermined angle ranges are not set in Table 2. However, optimum phase values ​​for each predetermined angle range may be set in a table such as Table 2 so that the sound output from the display panel speaker reaches the occupants 72 in the second-row seats 63, 64 and the occupants 71 in the third-row seats 65 to 67 with ideal impulse characteristics.

[0096] Furthermore, in the above-described embodiment, the in-vehicle audio display device 1 is described as having both a display panel type speaker and a vehicle speaker, but the speaker configuration of the in-vehicle audio display device 1 is not limited to this. For example, the in-vehicle audio display device 1 may be configured to have only a display panel type speaker. In this case, the auxiliary storage unit 14 may store only a table that lists appropriate acoustic setting values ​​for the display panel type speaker relative to the angle of the display panel 30. Furthermore, the in-vehicle audio display device 1 may be configured to have only vehicle speakers. In this case, the auxiliary storage unit 14 may store only a table that lists appropriate acoustic setting values ​​for the vehicle speakers (second-row seat speakers 41, 42, third-row seat speakers 51, 52) relative to the angle of the display panel 30.

[0097] Furthermore, in the above-described embodiment, the case where the display panel 30 rotates within the yz plane has been described, but the rotation direction of the display panel 30 is not limited to this. For example, the base 10 may be provided with another rotation mechanism in addition to the rotation mechanism 20, so that the display panel 30 rotates within the xy plane in addition to the yz plane. In this case, the auxiliary storage unit 14 may store a table that tabulates appropriate acoustic settings for each predetermined angle of the display panel 30, for angles within the xy plane in addition to angles within the yz plane.

[0098] Furthermore, in the above-described embodiment, the display panel 30 is rotated by being driven by the rotation mechanism 20, but the driving means for rotating the display panel 30 is not limited to this. For example, the display panel 30 may be rotated manually. Even in this case, the acoustic settings of the audio signal output to the display panel speaker can be changed according to the angle of the display panel 30 detected by the angle sensor 33 using a table of appropriate acoustic settings for the angle of the display panel 30 stored in the auxiliary storage unit 14.

[0099] Furthermore, in the above-described embodiment, a display panel type speaker is described as being configured with the display unit 31 and the actuator 32, but the configuration of the display panel type speaker is not limited to this. For example, instead of the display unit 31 and the actuator 32, a speaker such as a vehicle speaker may be provided on the display surface 31a side of the display panel 30. Furthermore, instead of the display surface 31a side, a speaker such as a vehicle speaker may be provided on the surface of the display panel 30 opposite the display surface 31a. Alternatively, a speaker such as a vehicle speaker may be provided on the side of the display panel 30.

[0100] In the above-described embodiment, the in-vehicle audio display device 1 is described as including a ceiling-suspended, foldable display device installed on the ceiling inside the vehicle cabin, but the form of the display device included in the in-vehicle audio display device 1 is not limited to this. For example, the in-vehicle audio display device 1 may also include a headrest-mounted, foldable display device installed in the headrest of the first-row seats 61, 62 or the second-row seats 63, 64. [Explanation of symbols]

[0101] 1...In-vehicle acoustic display device 10··Base 10a Rock 13 Control section 14...Auxiliary storage section 15 Rotation drive circuit 17 DSP 17a Gain adjustment circuit 17b Phase adjustment circuit 17c Delay adjustment circuit 17d Left / Right Balance Adjustment Circuit 17e Frequency characteristic adjustment circuit 20. Rotation mechanism 30 Display panel 31...Display section 31a·Display surface 32 Actuator 33 Angle Sensor 41, 42··Speakers for second-row seats 51, 52··Third-row seat speakers

Claims

1. a display panel supported by a base installed in a vehicle so as to be able to change its angle with respect to the base; an angle detector for detecting the angle; a first speaker provided on the display panel; a control unit that changes an acoustic setting of the sound output from the first speaker according to the angle; Equipped with the control unit increases a gain of the audio signal output to the first speaker as the distance from the display panel to the head of the occupant directly facing the display panel increases, according to the angle detected by the angle detector. Sound control device.

2. The display panel is installed in front of the occupants of the second row seats of the vehicle having three rows of seats, the control unit increases a gain of the audio signal output to the first speaker when the angle of the display panel with respect to the base detected by the angle detector is an angle at which the display panel faces directly toward the head of an occupant in a third row seat, compared to when the angle of the display panel with respect to the base detected by the angle detector is an angle at which the display panel faces directly toward the head of an occupant in a second row seat. The acoustic control device according to claim 1 .

3. When changing the acoustic settings of the sound output from the first speaker according to the angle, the control unit changes at least one setting of the phase, delay amount, and frequency characteristics of the audio signal output to the first speaker in addition to setting the gain of the audio signal output to the first speaker. The acoustic control device according to claim 1 or 2.

4. further comprising a second speaker in the vehicle, the second speaker being different from the first speaker; The control unit controls the second display panel in accordance with the angle of the display panel detected by the angle detector. Change the acoustic settings of the audio signal output to the speaker; The acoustic control device according to any one of claims 1 to 3.

5. When changing the acoustic settings of the sound output from the second speaker according to the angle, the control unit changes at least one setting of the gain, phase, delay amount, and frequency characteristics of the audio signal output to the second speaker. The acoustic control device according to claim 4.

6. the control unit changes the setting of at least one of a gain, a phase, a delay amount, and a frequency characteristic of the audio signal to be output to the second speaker between a case where the angle of the display panel with respect to the base detected by the angle detector is an angle where the display panel directly faces the head of an occupant in a second-row seat and a case where the angle of the display panel with respect to the base detected by the angle detector is an angle where the display panel directly faces the head of an occupant in a third-row seat. The acoustic control device according to claim 5 .

7. the second speaker is provided near a third row seat, the control unit increases a gain of the audio signal output to the second speaker as the angle of the display panel with respect to the base detected by the angle detector approaches an angle at which the display panel directly faces the head of an occupant in the third row seat. The acoustic control device according to any one of claims 4 to 6.

8. the second speaker is provided near a second row seat, the control unit increases a gain of the audio signal output to the second speaker as the angle of the display panel with respect to the base detected by the angle detector approaches an angle at which the display panel directly faces the head of an occupant in a third row seat from an angle at which the display panel directly faces the head of an occupant in a second row seat. The acoustic control device according to any one of claims 4 to 6.

9. An acoustic control method for changing acoustic settings in a vehicle cabin by a control unit, comprising: the control unit detects an angle of a display panel supported by a base installed in a vehicle with respect to the base, and changes an acoustic setting of a sound output from a first speaker provided in the display panel in accordance with the detected angle of the display panel; the control unit increases a gain of the audio signal output to the first speaker as the distance from the display panel to the head of the occupant directly facing the display panel increases, according to the detected angle; Acoustic control methods.

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