JP2009290663A - On-vehicle speaker system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an on-vehicle speaker system with relatively high acoustic characteristics at a listening position inside a vehicle in simple configuration and to include relatively high acoustic characteristics even at a listening position deviated from the center of the vehicle. <P>SOLUTION: The on-vehicle speaker system 1 includes a speaker unit 10 installed inside a vehicle, and the speaker unit 10 includes two woofers 11, 12 disposed horizontally and a tweeter 13 disposed between the two woofers 11, 12. The tweeter and the woofers are disposed so as to make a sound image position the same as a virtual coaxial type. The speaker unit 10 is disposed at one of or both left side and right side on a front dashboard 51 inside the vehicle, is disposed while an acoustic radiation direction (A10) is inclined by only a specified angle (θ1) with respect to an axis (A50) along a length direction of a vehicle 50, and radiates sonic waves toward the vicinity of a listening position. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle-mounted speaker system.

For example, a multi-speaker system is known as an in-vehicle speaker system installed in the interior of a vehicle such as an automobile (see, for example, Patent Document 1).
In a general vehicle-mounted speaker system, for example, front speakers are disposed on the left and right doors of the vehicle, and rear speakers are disposed on the left and right sides of the vehicle.

Japanese Patent Laid-Open No. 10-224887 (FIG. 5)

However, the listener is seated in the driver's seat, the passenger seat, the rear seat, etc. in the vehicle interior, and the listening position is shifted to the left or right by a specified distance from the axis along the longitudinal direction of the vehicle. For this reason, a clear sound image localization may not be obtained at the listening position due to a difference in distance from the listening position to the left speaker and the right speaker, a difference in acoustic characteristics of the left and right speakers based on the listening position, and the like.
The interior of the vehicle is a relatively narrow space surrounded by windshields, door glasses, door side surfaces, ceilings, floors, and the like. For this reason, for example, reflected sound components from the left and right door glasses may adversely affect the acoustic characteristics at the listening position.

  By the way, a technique for correcting acoustic characteristics at a listening position by performing signal processing such as delay and phase control on an electric signal input to each speaker is known. However, when this technology is simply applied to a vehicle-mounted speaker system, the acoustic characteristics are improved at a listening position of a specific listener, but the acoustic characteristics may be lowered at other listening positions.

  This invention makes it an example of a subject to cope with such a problem. That is, providing a vehicle-mounted speaker system having a relatively high acoustic characteristic at a listening position in a vehicle with a simple configuration, having a relatively high acoustic characteristic even at a listening position deviated from the center of the vehicle, It is an object of the present invention that the difference in acoustic characteristics at the seating position in the passenger seat is relatively small, the reflected sound components from both sides in the vehicle compartment are relatively small, and the like.

  In order to achieve such an object, the present invention includes at least a configuration according to the following independent claims.

  An in-vehicle speaker system according to the present invention includes a speaker unit installed in a vehicle compartment, and the speaker unit is disposed between two low-frequency sound reproducing speakers arranged horizontally and the two low-frequency sound reproducing speakers. The high-pitched sound reproduction speaker and the two low-pitched sound reproduction speakers are arranged so as to have the same sound image position as a virtual coaxial type, and the speaker unit is located in front of the vehicle compartment. The speaker unit is disposed on one or both of the left and right sides of the dashboard, and the sound emission direction of the speaker unit is inclined at a specified angle with respect to an axis along the longitudinal direction of the vehicle, toward the vicinity of the listening position. It is characterized by emitting sound waves.

  An in-vehicle speaker system according to an embodiment of the present invention includes a speaker unit installed in a vehicle compartment, and the speaker unit is located between two low-frequency sound reproducing speakers and two low-frequency sound reproducing speakers arranged horizontally. The high-frequency sound reproduction speaker and the two low-frequency sound reproduction speakers are arranged so as to have the same sound image position as a virtual coaxial type, and the speaker unit has a dash in front of the vehicle compartment. It is arranged on one or both of the left and right sides on the board, and the sound emission direction of the speaker unit is inclined at a specified angle with respect to the axis along the longitudinal direction of the vehicle, and the sound wave is directed toward the vicinity of the listening position. It is characterized by radiating.

The in-vehicle speaker system includes a so-called virtual coaxial speaker unit, and more specifically, two low-pitched sound reproducing speakers arranged horizontally and a high-pitched sound reproducing speaker disposed between the two low-pitched sound reproducing speakers. Yes. This virtual coaxial type speaker unit is defined such that the directivity in the left-right direction is narrower than the directivity in the vertical direction, and its acoustic radiation direction is defined toward the vicinity of the listener's listening position in the vehicle compartment. At the listening position, the reflected sound component from both sides of the vehicle is relatively small and the direct sound component is relatively large. For this reason, the vehicle-mounted speaker system according to the present invention has relatively high acoustic characteristics at the listening position in the vehicle.
The virtual coaxial speaker unit is disposed on the left and right sides on the dashboard of the vehicle, and the directivity in the horizontal direction of the virtual coaxial speaker unit is defined to be narrower than the directivity in the vertical direction. A sound wave is emitted toward the vicinity. For this reason, even if the listening position is shifted to the left or right side from the axis along the longitudinal direction of the vehicle, such as the driver's seat or the passenger's seat, the acoustic characteristic difference between the sound waves from the left and right speaker units is relatively small. That is, the vehicle-mounted speaker system according to the present invention can radiate a relatively high-quality sound wave to a listening position shifted from the center in the vehicle compartment, for example, with a simple configuration.

  Hereinafter, an in-vehicle speaker system according to an embodiment of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a diagram for explaining an in-vehicle speaker system 1 according to a first embodiment of the present invention. Specifically, FIG. 1A is a diagram for explaining the arrangement of the virtual coaxial speaker unit 10 viewed from the upper side of the vehicle 50 and the signal processing device 2. For example, the signal processing device 2 is disposed in the vehicle 50. FIG. 1B is a diagram for explaining the arrangement of the speaker units 10 viewed from the lateral direction of the vehicle 50 shown in FIG.

  FIG. 2 is a diagram for explaining the virtual coaxial speaker unit 10 of the in-vehicle speaker system 1. Specifically, FIG. 2A is a top view of the speaker unit 10, FIG. 2B is a front view of the speaker unit 10, and FIG. 2C is a side view of the speaker unit 10.

The vehicle 50 is, for example, an automobile or a train. The in-vehicle speaker system 1 according to the present embodiment is a speaker system mounted on an automobile, for example.
As shown in FIGS. 1 (A) and 1 (B), a listener (H) is seated in a vehicle 50, for example, in a driver's seat or a passenger seat. As shown in FIG. 1 (A), when viewed from the upper side of the vehicle, the listening position by the listener (H) is in the room of the vehicle 50 from the axis A50 along the longitudinal direction of the vehicle 50 to the left or right side of the vehicle 50. In addition, they are shifted by a specified distance.

As shown in FIGS. 1 and 2, the vehicle-mounted speaker system 1 includes a speaker unit 10 and a signal processing device 2. The speaker unit 10 corresponds to an embodiment of the speaker unit according to the present invention, and the signal processing device 2 corresponds to an embodiment of the signal processing device 2 according to the present invention.
The speaker unit 10 is installed in the room of the vehicle 50. When an electric signal is input from the signal processing device 2, the speaker unit 10 radiates a sound wave corresponding to the electric signal toward the vicinity of the listening position.

Specifically, the speaker unit 10 according to the present embodiment includes a front left speaker unit 10L and a front right speaker unit 10R. The speaker units 10L and 10R are also collectively referred to as a speaker unit 10.
The front left speaker unit 10 </ b> L is disposed on the left side on the front (F) dashboard 51 inside the vehicle 50, for example, as shown in FIGS. 1 (A) and 1 (B). The front right speaker unit 10 </ b> R is disposed on the right side on the front (F) dashboard 51 in the vehicle 50.

The acoustic radiation direction (A10) of the speaker unit 10 (10L, 10R) is disposed to be inclined by a specified angle (θ1) with respect to the axis (A50) along the longitudinal direction of the vehicle 50.
Hereinafter, the speaker unit 10 (10L, 10R) will be described in detail with reference to the drawings.

[Speaker unit 10 (10L, 10R)]
As shown in FIGS. 2 (A), 2 (B), and 2 (C), the speaker unit 10 according to the present embodiment includes two low sound reproduction speakers 11 and 12 and a high sound reproduction speaker 13. The two bass reproduction speakers 11 and 12 correspond to an embodiment of the bass reproduction speaker according to the present invention, and the treble reproduction speaker 13 corresponds to an embodiment of the treble reproduction speaker according to the present invention.

  As shown in FIGS. 2 (A), 2 (B), and 2 (C), the two low-pitched sound reproducing speakers 11 and 12 are horizontally arranged, and the high-pitched sound is sounded between the two low-frequency sound reproducing speakers 11 and 12. A playback speaker 13 is arranged. In the present embodiment, the low sound reproduction speakers 11 and 12 and the high sound reproduction speaker 13 are arranged in the cabinet 15 as described above.

  The low sound reproduction speakers 11 and 12 are so-called woofers. The low-pitched sound reproducing speakers 11 and 12 are, for example, a cone-shaped or flat-plate-shaped diaphragm, a voice coil bobbin joined to the diaphragm, a voice coil wound around the voice coil bobbin, and a voice coil. A magnetic circuit in which a magnetic gap is formed, a speaker frame, and the like. As the magnetic circuit, for example, an inner magnet type magnetic circuit, an outer magnet type magnetic circuit, or the like can be adopted.

  The high sound reproduction speaker 13 is a so-called tweeter. The high-frequency sound reproduction speaker 13 is loosely fitted with a diaphragm having a predetermined shape such as a dome type or a cone type, a voice coil bobbin joined to the diaphragm, a voice coil wound around the voice coil bobbin, and a voice coil. A magnetic circuit in which a magnetic gap is formed, a speaker frame, and the like.

  The low sound reproduction speakers 11 and 12 and the high sound reproduction speaker 13 are not limited to the above-described embodiments, and a prescribed type of speaker may be employed.

As shown in FIGS. 2 (A), 2 (B), and 2 (C), the central axis A13 of the high-pitched sound reproduction speaker 13 is positioned between the central axes A11 and A12 of the two low-frequency speakers. The low sound reproduction speakers 11 and 12 and the high sound reproduction speaker 13 are arranged. That is, each of the high sound reproduction speaker 13 and the two low sound reproduction speakers 11 and 12 is a virtual coaxial type, and has the same sound image position on the central axis A13 of the high sound reproduction speaker 13 (the central axis A10 of the speaker unit 10). It is arranged to become.
The speaker unit 10 having the above configuration is referred to as a vertical twin. Further, since the low sound reproduction speakers 11 and 12 and the high sound reproduction speaker 13 are horizontally arranged, the speaker unit 10 is also referred to as a horizontal twin.

  FIG. 3 is a diagram for explaining the directivity of the virtual coaxial speaker unit 10. Specifically, FIG. 3A is a diagram for explaining a directivity pattern in the left-right direction (horizontal direction) of the speaker unit, and FIG. 3B is a diagram for explaining a directivity pattern in the vertical direction of the speaker unit. FIG. The directivity pattern of the speaker unit 10 shown in FIGS. 3 (A) and 3 (B) is a specific example, and is not limited to this form.

  As shown in FIGS. 3A and 3B, the speaker unit 10 has a narrower directivity characteristic in the left-right direction than that in the vertical direction. Specifically, the speaker unit 10 has the same and relatively narrow directivity pattern in the left-right direction as shown in FIG. 3A, and the directivity characteristics are compared in the vertical direction as shown in FIG. 3B. Wide. When the speaker unit 10 is arranged on the dashboard 51 as shown in FIG. 1 (A), the direct sound component toward the listening position of the listener (H) is relatively large, and from both sides of the vehicle 50. The reflected sound component of becomes relatively small.

  Further, by utilizing the fact that the directivity pattern of the speaker unit 10 is symmetrical, the speaker unit 10 is arranged on the dashboard 51 of the vehicle, and the speaker sound axis A10 is defined in the direction of the occupant so that the left and right listening can be performed. The characteristic difference at the position can be made relatively small. Further, in the speaker unit 10 having the above-described arrangement, unnecessary reflected sound from the vehicle side is relatively small at the listening position. The on-vehicle speaker system 1 can provide high-quality sound at a listening position in the vehicle with a simple configuration.

  FIG. 4 is a diagram for explaining the arrangement of the speaker units in the vehicle. Specifically, FIG. 4A is an arrangement diagram of the speaker units according to the first specific example, and FIG. FIG. 6 is a layout diagram of speaker units according to a second specific example.

  FIG. 5 is a diagram for explaining a virtual coaxial speaker unit according to an embodiment of the present invention. Specifically, FIG. 5 is a perspective view of the interior of the vehicle for explaining an arrangement example of the virtual coaxial speaker unit according to the embodiment of the present invention.

  As shown in FIG. 4A and FIG. 5, for example, the speaker unit 10 provided with the cabinet 15 with the low-pitched sound reproducing speakers 11 and 12 and the high-pitched sound reproducing speaker 13 is arranged on the dashboard 51 of the vehicle 50. Also good. Since the speaker unit 10 is disposed on the dashboard 51 of the vehicle 50 and the sound radiation direction is disposed toward the vicinity of the listening position, the sound wave can be directly radiated toward the listening position.

  Further, as shown in FIGS. 1B, 4A, and 5, the speaker unit 10 is disposed on the dashboard 51 of the vehicle 50, so that the sound waves radiated from the speaker unit 10 are, for example, the front Reflected on the glass 52 and the like. Therefore, the speaker unit 10 disposed on the dashboard 51 of the vehicle 50 has a relatively narrow directivity pattern that is sharp toward the listening position, as shown in FIG. Therefore, the in-vehicle speaker system 1 can provide relatively high acoustic characteristics not only in the driver seat and the passenger seat but also in the listening position at the rear seat.

  As shown in FIG. 4B, the speaker unit 10A may be arranged with the low sound reproduction speakers 11 and 12 and the high sound reproduction speaker 13 directly on the dashboard 51A of the vehicle 50A. By doing so, the acoustic characteristics in the low sound range become relatively high.

As described above, the listening positions of the driver seat and the passenger seat are shifted by a specified distance to the left or right with respect to the central axis A50 along the longitudinal direction of the vehicle 50, as shown in FIG. positioned.
Therefore, as shown in FIGS. 1 (A) and 1 (B), the acoustic radiation directions of the front left speaker unit 10L and the front right speaker unit 10R are directed to intermediate positions between the listening positions of the driver seat and the passenger seat. Are preferably defined.
Specifically, the acoustic radiation direction (A10) of the speaker unit 10 (10L, 10R) is inclined by a specified angle (θ1) with respect to the axis (A50) along the longitudinal direction of the vehicle 50 when viewed from the upper side of the vehicle. When viewed from the lateral direction of the vehicle, they are inclined upward by a specified angle (θ2) with respect to the horizontal direction.
In the vehicle-mounted speaker system 1 having the above configuration, relatively high acoustic characteristics can be obtained at the listening position in the vehicle interior.

  In the in-vehicle speaker system 1, since the speaker unit (10L, 10R) is disposed on the dashboard 51 of the vehicle 50 and defined in the acoustic direction, the direct sound wave component is relatively large at the listening position, In addition, the reflected sound components on both sides of the vehicle 50 are relatively small.

  Further, as shown in FIGS. 1B and 3B, the speaker unit 10 is defined such that the sound radiation direction (A10) is tilted upward by a specified angle (θ2) from the horizontal direction, and the listening position in the vehicle Since the sound wave is emitted toward the vehicle, the direct sound wave component is relatively large and the reflected sound component on both sides of the vehicle 50 is relatively small.

[Signal processing device 2]
As shown in FIG. 1A, the signal processing apparatus 2 according to the present embodiment includes, for example, a source (SRC) 21, a signal processing circuit (DSP) 22, an amplifier (AMP) 23, a user interface (UI) 24, And a control circuit (CTR) 25.

The source (SRC) 21 is a device that outputs an electrical signal including an audio signal, such as a radio broadcast receiving device, a television broadcast receiving device, an audio disc player, and a hard disk drive, and outputs the audio signal to the DSP 22.
For example, the signal processing circuit (DSP) 22 performs prescribed signal processing on the electric signal input from the source 21 and then outputs the electric signal to the amplifier 23. Further, the DSP 22 may perform a delay process corresponding to the distance between the speaker unit 10 and the listening position on the electric signal input to the speaker unit 10 and then output the electric signal after the delay process. . By doing so, the acoustic characteristics at the listening position are further enhanced.
The amplifier (AMP) 23 amplifies the electric signal from the DSP 22 and outputs it to the speaker unit 10 (10L, 10R).
The user interface (UI) 24 is, for example, a display device or an operation input device, and is an interface between the user and the signal processing device.
The control circuit (CTR) 25 comprehensively controls the SRC 21, DSP 22, AMP 23, and UI 24.

  Further, for example, as shown in FIG. 2A, the network element 3 may be provided in the speaker unit 10 according to the present embodiment. The signal processing device 2 inputs an electrical signal to the speaker unit 10 via the network element 3. The network element 3 includes, for example, a capacitor, a coil, a resistor, a transistor, an integrated circuit, and the like.

The network element 3 includes low-pass filters (LPF) 311 and 312 and a high-pass filter (HPF) 313 as shown in FIG.
The LPF 311 is electrically connected between the low sound reproduction speaker 11 of the speaker unit 10 and the signal processing device 2. The LPF 312 is electrically connected between the bass reproduction speaker 12 of the speaker unit 10 and the signal processing device 2.
The HPF 313 is electrically connected between the high sound reproduction speaker 13 of the speaker unit 10 and the signal processing device 2.

  In the speaker unit 10 configured as described above, when an electric signal is input from the signal processing device 2 via the network element 3, high-quality sound waves are emitted from the low-frequency sound reproduction speakers 11 and 12 and the high-frequency sound reproduction speaker 13.

[Second Embodiment]
FIG. 6 is an overall view for explaining an in-vehicle speaker system according to the second embodiment of the present invention.
The in-vehicle speaker system may include, for example, at least one of a front center speaker unit, a rear left speaker unit, and a rear right speaker unit as a virtual coaxial speaker unit.
Specifically, as shown in FIG. 6, the in-vehicle speaker system 1B includes a front left speaker unit (10FL), a front right speaker unit (10FR), a front center speaker unit (10FC), a rear left speaker unit (10RL), And a rear right speaker unit (10RL). Each of the speakers is a virtual coaxial speaker unit.

For example, in the case of a sedan type vehicle 50, the rear left speaker unit (10RL) and the rear right speaker unit (10RL) are arranged on the rear tray 55 on the rear side (B) of the vehicle interior as shown in FIG. Alternatively, in the case of an RV (Recreational Vehicle) or SUV (Sport Utility Vehicle) type vehicle, it may be installed at the upper rear of the vehicle.
The speaker unit 10 may be used as a center speaker for multichannel or sound image correction. By doing so, it is possible to improve the sound quality by reducing the difference in characteristics between the right and left seats and reducing the reflected sound on the unnecessary side.

As described above, the in-vehicle speaker system 1 according to the present invention has the speaker unit 10 installed in the vehicle interior, and the speaker unit 10 includes two low-frequency sound reproducing speakers 11 and 12 arranged horizontally. And a high sound reproduction speaker 13 disposed between the two low sound reproduction speakers 11 and 12. Each of the high-pitched sound reproducing speaker and the two low-pitched sound reproducing speakers is a virtual coaxial type and is arranged so that the sound image positions are the same. The speaker unit 10 is arranged on one or both of the left side and the right side on the dashboard 51 in the front of the vehicle compartment, and the sound radiation direction (A10) of the speaker unit 10 is an axis along the longitudinal direction of the vehicle 50 ( A50) is inclined with respect to the specified angle (θ1) and emits sound waves toward the vicinity of the listening position. For this reason, it is possible to provide an in-vehicle speaker system having a relatively high acoustic characteristic at a listening position in the vehicle 50 with a simple configuration.
Further, the in-vehicle speaker system 1 has relatively high acoustic characteristics even at a listening position deviated from the center of the vehicle 50.
In addition, the in-vehicle speaker system 1 has a relatively small difference in acoustic characteristics at the seating positions in the driver's seat and the passenger seat.
Moreover, the vehicle-mounted speaker system 1 has relatively small reflected sound components from both sides in the vehicle compartment.

  The present invention is not limited to the above embodiment. For example, the in-vehicle speaker system may not have two virtual coaxial speaker units (first embodiment) and five virtual coaxial speaker units (second embodiment). The in-vehicle speaker system may have only one virtual coaxial speaker unit, may have two or more virtual coaxial speaker units, or a general speaker unit and a virtual coaxial type. You may combine with a speaker unit.

It is a figure for demonstrating the vehicle-mounted speaker system 1 which concerns on 1st Embodiment of this invention. (A) is a figure for demonstrating arrangement | positioning of the virtual coaxial type speaker unit 10 visually recognized from the upper side of the vehicle 50, and the signal processing apparatus 2. FIG. (B) is a figure for demonstrating arrangement | positioning of the speaker unit 10 visually recognized from the horizontal direction of the vehicle 50 shown to (A). It is a figure for demonstrating the virtual coaxial speaker unit 10 of the vehicle-mounted speaker system 1. FIG. (A) is a top view of the speaker unit 10, (B) is a front view of the speaker unit 10, and (C) is a side view of the speaker unit 10. 4 is a diagram for explaining directivity of a virtual coaxial speaker unit 10. FIG. (A) is a figure for demonstrating the directivity pattern of the left-right direction (horizontal direction) of a speaker unit, (B) is a figure for demonstrating the directivity pattern of the up-down direction of a speaker unit. It is a figure for demonstrating arrangement | positioning of the speaker unit in a vehicle, (A) is the arrangement | positioning figure of the speaker unit which concerns on a 1st specific example, (B) is the arrangement | positioning figure of the speaker unit which concerns on a 2nd specific example. is there. It is a figure for demonstrating the virtual coaxial type speaker unit which concerns on one Embodiment of this invention. It is a whole figure for demonstrating the vehicle-mounted speaker system which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 In-vehicle speaker system 2 Signal processing apparatus 3 Network element 10 Speaker unit 11, 12 Speaker for low sound reproduction 13 Speaker for high sound reproduction 15 Cabinet 50 Vehicle 51 Dashboard 52 Windshield

Claims (9)

An in-vehicle speaker system having a speaker unit installed in a vehicle compartment,
The speaker unit includes two low-pitched sound reproducing speakers arranged horizontally and a high-pitched sound reproducing speaker disposed between the two low-pitched sound reproducing speakers, and the high-pitched sound reproducing speaker and the two low-pitched sound reproducing speakers. Each speaker is arranged as a virtual coaxial type so that the sound image positions are the same,
The speaker unit is disposed on one or both of the left and right sides on the dashboard in front of the vehicle interior, and the sound emission direction of the speaker unit is inclined by a specified angle with respect to an axis along the longitudinal direction of the vehicle. The vehicle-mounted speaker system is characterized by emitting sound waves toward the vicinity of the listening position.   2. The vehicle-mounted speaker according to claim 1, wherein the speaker unit is arranged such that a central axis of the high-frequency sound reproducing speaker is positioned between the central axes of the two low-frequency speakers. system.   The in-vehicle speaker system according to claim 1, wherein the speaker unit has a narrower directivity characteristic in the left-right direction than a directivity characteristic in the vertical direction. Having at least a front left speaker unit and a front right speaker unit as the speaker unit;
The sound radiation directions of the front left speaker unit and the front right speaker unit are defined toward intermediate positions of the listening positions of the driver seat and the passenger seat of the vehicle, respectively. The in-vehicle speaker system according to any one of the above.   5. The speaker unit according to claim 1, wherein the speaker unit is defined such that an acoustic radiation direction is inclined upward by a specified angle from a horizontal direction, and emits a sound wave toward the listening position. In-vehicle speaker system.   The in-vehicle speaker system according to any one of claims 1 to 5, wherein the listening position is shifted to the left or right from an axis along the longitudinal direction of the vehicle. A signal processing device for inputting an electrical signal to the speaker unit via a network element;
The network element includes a high-pass filter electrically connected between the loudspeaker reproducing speaker of the speaker unit and the signal processing device;
The vehicle-mounted speaker system according to any one of claims 1 to 6, further comprising: a low-pass filter electrically connected between the speaker for low-pitched sound reproduction of the speaker unit and the signal processing device. .   A signal processing device that performs a delay process on the electrical signal input to the speaker unit according to the distance between the speaker unit and the listening position, and then inputs the electrical signal after the delay process to the speaker unit. The in-vehicle speaker system according to any one of claims 1 to 6.   The in-vehicle speaker system includes at least one of a front center speaker unit, a rear left speaker unit, and a rear right speaker unit as a virtual coaxial speaker unit. The in-vehicle speaker system described.

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