JP2019166947A - Vehicle speaker system - Google Patents

Abstract

To provide a vehicle speaker system capable of widening a passenger compartment assuming that sounds in a whole band from an extremely low range to a high range are generated, and a front localization feeling is not spoiled, and capable of suppressing an increase in an instrument panel occupied area by a speaker, and suppressing protrusion of the instrument panel.SOLUTION: A vehicle speaker system includes: a first speaker 21 having a large area, installed in a position in the front side of a backrest part of a seat 80 in a vehicle partition wall plate, driven by a first electric signal corresponding to a first frequency band including an extremely low range and a low range, radiating a passenger compartment space with sound pressure rearward, and discharging back pressure to a passenger compartment outer space; and a second speaker 22 having a small area, installed in a position in the front side of the backrest part at least in one selected from the group consisting of an instrument panel, an A-pillar and a door, driven by a second electric signal corresponding to a second frequency band including a middle range and a high range, and radiating the passenger compartment space with sound pressure rearward.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle speaker system that can ensure a sense of front orientation without increasing speaker occupancy in a door and an instrument panel (instrument panel).

  The most common speaker system for vehicles is a speaker with a small area (tweeter) for high frequencies installed in the instrument panel, and a speaker with a relatively large area for mid and low frequencies (midbus) installed sideways on the door. A speaker (subwoofer) that bears an ultra low frequency (about 60 Hz or less) is installed in a trunk or the like at the rear of the vehicle. According to this, it is possible to generate the sound of the entire band from the very low range to the high range. In addition, it is said that it is not known where the sound of 60 Hz or less is heard in the human ear, and even if the speaker is installed at the rear of the vehicle, a sense of front orientation can be obtained.

  However, in such a system, since a mid bus having a large area is installed on the door, there is a problem that the door is thickened and the interior space is narrowed. Moreover, since the sound is sideways, there is a problem that the sound is difficult to reach the passenger and the sound quality is deteriorated.

  Therefore, as a system in which the midbus is not provided at the door, for example, Patent Document 1 proposes a speaker system in which each of a low-frequency speaker and a high-frequency speaker is installed in the instrument panel.

JP-A-10-224877

  In the speaker system disclosed in Patent Document 2, in the embodiment (FIG. 1), a bass reflex type speaker for enhancing a bass reproduction capability is incorporated in an instrument panel. If such a speaker with a large volume is arranged on the side of the instrument panel, particularly on the outside of the handle, the instrument panel will protrude greatly by the speaker. Such an arrangement narrows the passenger's foot space and reduces the comfort of the vehicle interior space. In addition, there is a possibility that the driver's operability of the vehicle is remarkably lowered, which is not a realistic arrangement from the viewpoint of safety. Further, in Patent Document 1, there is no description of a subwoofer responsible for the ultra low frequency, and it is difficult to say that the sound of the entire band from the ultra low frequency to the high frequency can be generated.

  The present invention has been made in view of such a state of the art, and its purpose is to generate sound of the entire band from the ultra-low range to the high range and not to impair the sense of localization. An object of the present invention is to provide a vehicular speaker system that can widen the passenger compartment, suppress an increase in the area occupied by the instrument panel due to the speaker, and suppress overhang of the instrument panel.

  In one aspect, the present invention provided in order to solve the above-mentioned problem is that the vehicle interior space is separated from the vehicle interior space by a vehicle partition plate, and an instrument panel is installed on the front side of the vehicle interior space. A speaker system for a vehicle that is used in a vehicle in which a seat is installed in the vehicle, wherein 20 Hz or more and less than 60 Hz is an ultra-low range, 60 Hz or more and less than 150 Hz is a low range, 150 Hz or more and less than 5000 Hz is a mid range, and 5000 Hz or more and 20 kHz or less is a high range. The vehicle interior is installed at a position in front of the seat back portion of the vehicle partition plate and driven by a first electric signal corresponding to a first frequency band including the ultra low frequency range and the low frequency range. A large-area first speaker that radiates sound pressure backwards into the space and exhausts back pressure into the vehicle exterior space; An instrument panel, a front pillar provided on the side of the instrument panel, and a front side of at least one selected from the group consisting of doors, and includes a middle region and a high region. A vehicle speaker system comprising: a second speaker having a small area that is driven by a second electrical signal corresponding to two frequency bands and radiates sound pressure backward in the vehicle interior space.

  Speakers that generate low-frequency sound pressure (low-frequency speakers) should appropriately apply back pressure that is opposite in phase to the normal sound pressure that should reach the passenger whose ear is located near the backrest. A structure for controlling (suppressing / reversing) is required. In the speaker system disclosed in Patent Document 1, a low-frequency speaker is incorporated in an instrument panel, and the low-frequency speaker shown as a specific example is a bass-reflex type. Therefore, in the speaker system described in Patent Document 1, the low-frequency speaker is provided with an enclosure for receiving back pressure and a duct for inverting the back pressure and radiating it into the vehicle interior space. As a result, the low-frequency speaker of the speaker system described in Patent Document 1 has an extremely large volume, and the space under the feet of the driver seat and the passenger seat is narrow. Needless to say, this reduces the comfort of the vehicle interior space and can adversely affect the operability of the driver.

  Therefore, the speaker system according to one aspect of the present invention has a structure in which back pressure is discharged to the exterior space of the first speaker including low-frequency sound pressure. By having such a structure, the volume required for the first speaker can be reduced. As a result, even if the first speaker is arranged in front of the seat back portion so as to enhance the forward localization feeling of the sound image based on the first frequency band, the instrument panel does not protrude, The habitability is unlikely to decline. In addition, although the 1st speaker of this invention bears the zone | band of 60 Hz or more said to be able to feel where the human ear is ringing, since it is arrange | positioned ahead from the backrest part, There is no loss of forward orientation.

  And the second speaker that generates the sound pressure based on the signal of the second frequency band having a relatively high directivity is also disposed in front of the seat back portion, thereby generating a sound image with a sense of front localization over the entire area. Can do. Since the second speaker does not bear a low frequency, the area can be reduced, and the back pressure can be processed by a small volume enclosure or sound absorbing material, so that the instrument panel can be projected without increasing the occupied area of the instrument panel. Does not grow.

  In the speaker system, the first speaker is positioned in front of the second speaker, and a distance from the seat back portion to the first speaker is greater than a distance from the seat back portion to the second speaker. The driving of the second speaker by the second electric signal may be delayed from the driving of the first speaker by the first electric signal. In this way, if the difference between the arrival time of the sound to the passenger of the first speaker and the arrival time of the sound to the passenger of the second speaker is reduced, the sound of the first speaker and the sound of the second speaker overlap. The phase shift of the sound from both speakers in the band can be reduced, and the cancellation of sound can be prevented. Note that if the optimal delay time is set for the front seat passenger when the subwoofer is installed at the rear of the vehicle, the delay time becomes inappropriate for the rear seat passenger and the sound quality at the rear seat is poor. It will get worse. However, according to the present invention, if an optimal delay time is set for the front seat passenger, the optimal delay time is set for the rear seat passenger, and deterioration of sound quality in the rear seat is prevented. be able to.

  In addition, the first speaker is disposed on the vehicle partition plate, and the front side of the backrest portion in at least one selected from the group consisting of the instrument panel, a front pillar provided on a side of the instrument panel, and a door. When the second speaker is disposed on the seat, the distance from the back portion of the seat to the first speaker is longer than the distance from the back portion of the seat to the second speaker. In this case, the sound of the second speaker reaches the occupant's ear earlier than the sound of the first speaker, and the occupant may feel uncomfortable. However, by delaying the driving of the second speaker, Can reduce a sense of incongruity.

  In the above-described vehicle speaker system, the vehicle partition plate includes a lower partition plate that separates a vehicle exterior space and a vehicle interior space located below the vehicle interior space, and the first speaker is the lower speaker plate. You may install in the side partition board. In this case, the back pressure of the first speaker is discharged to the outside space of the vehicle.

  In the above speaker system, the second speaker may be provided in at least one selected from the group consisting of the instrument panel and the front pillar. That is, it may be preferable that the second speaker is not provided on the door. Since the thickness of the door is limited, the degree of freedom in designing the shape of the second speaker is reduced. In addition, when the second electrical signal is generated at a portion other than the door in the vehicle and connected to the second speaker in the door by wire, it is necessary to arrange a cable around or inside the door hinge. It may cause a decline in sex.

  Note that both the first speaker and the second speaker may be composed of a plurality of speakers.

  According to the vehicle speaker system of the present invention, it is possible to widen the vehicle compartment on the premise that sound in the entire band from the very low range to the high range is generated and the front localization feeling is not impaired. It is possible to suppress an increase in the exclusive area and to prevent the instrument panel from protruding.

BRIEF DESCRIPTION OF THE DRAWINGS It is (a) sectional drawing and (b) top view which show notionally the structure of a vehicle provided with the speaker system for vehicles which concerns on one Embodiment of this invention. It is a block diagram of the speaker system for vehicles concerning one embodiment of the present invention. It is a graph which shows notionally the zone distribution of the sound pressure which arises from each of the speaker with which the speaker system for vehicles concerning the suitable example of one embodiment of the present invention is provided. It is sectional drawing which shows notionally the structure of the speaker with which the speaker system for vehicles which concerns on one Embodiment of this invention is provided.

  Embodiments of the present invention will be described below with reference to the drawings. Fig.1 (a) is sectional drawing which shows notionally the structure of the vehicle provided with the speaker system for vehicles which concerns on one Embodiment of this invention, FIG.1 (b) is the vehicle which concerns on one Embodiment of this invention. It is a top view which shows notionally the structure of the vehicle provided with the speaker system for vehicles.

  As shown in FIG. 1, a vehicle 100 including a vehicle speaker system according to an embodiment of the present invention is positioned as one of a vehicle interior space S1 and a vehicle exterior space by a front partition plate 110 which is a kind of vehicle partition plate. The vehicle exterior front space SE is separated. Specifically, the vehicle exterior front space SE is located in front of the vehicle interior space S1 (X1-X2 direction X2 side in FIG. 1), and a front partition plate 110 is provided as a member separating these spaces. An instrument panel (sometimes abbreviated as “instrument panel” in this specification) 90 is installed on the front side (X1-X2 direction X2 side) of the vehicle interior space S1, and the center (instrument panel) of the vehicle interior space S1. The seat 80 (the right seat 80R and the left seat 80L) is installed on the X1-X2 direction X1 side of the 90. Each of the seats 80 (the right seat 80R and the left seat 80L) has a backrest portion 80b (the right seat backrest portion 80Rb, the left seat backrest portion 80Lb). Located to touch.

  The vehicle 100 includes one first speaker 21 and two second speakers 22 (right second speaker 22R, left second speaker 22L). The area of the first speaker 21 is large and the area of the second speaker 22 is small.

  The first speaker 21 is provided on the front partition plate 110, which is a vehicle partition plate positioned in front of the back portion 80b of the seat 80 in the vehicle partition plate, and can radiate sound pressure AP to the vehicle interior space S1. Therefore, it is possible to ensure a sense of localization of the sound generated from the first speaker 21. In this example, the diameter of the diaphragm 12 of the first speaker 21 is 20 cm.

  Since the first speaker 21 is provided on the front partition plate 110, the back pressure BP can be discharged to the front space SE outside the vehicle compartment. The front partition plate 110 is a member on which appropriate soundproofing measures are taken to prevent sound from entering the vehicle interior space S1 from the vehicle exterior front space SE in order to ensure quietness of the vehicle interior space S1. Accordingly, the front partition plate 110 can function as a baffle plate that acoustically and appropriately separates the vehicle interior space S1 and the vehicle exterior front space SE. Therefore, the first speaker 21 is attached to the front partition plate 110 and the back pressure BP is discharged to the front space SE outside the vehicle compartment, so that the first speaker 21 does not require an enclosure and its volume is reduced. be able to. As described above, the first speaker 21 is disposed on the front side (X1-X2 direction X2 side) of the backrest portion 80b of the seat 80, thereby realizing a high forward orientation feeling and the comfortability of the vehicle interior space S1. The decrease can be suppressed.

  The two second speakers 22 (the right second speaker 22R and the left second speaker 22L) are provided in front of the backrest portion 80b in the instrument panel 90 (X1-X2 direction X2 side), and face rearward in the vehicle interior space S1. The sound pressure AP can be radiated in the (X1-X2 direction X1 side). As will be described later, since the frequency band of the sound pressure AP radiated from the second speaker 22 is approximately 150 Hz or more, the back pressure BP can be easily processed using a small enclosure or a sound absorbing material. In this example, the diameter of the diaphragm 12 of the second speaker 22 is 6 cm. That is, in this example, the diaphragm 12 of the first speaker 21 has a relatively large area, and the diaphragm 12 of the second speaker 22 has a relatively small area. The distance from the seat back portion 80b to the first speaker 21 is longer than the distance from the seat back portion 80b to the second speaker 22.

  FIG. 2 is a block diagram of a vehicle speaker system according to an embodiment of the present invention. FIG. 2 shows a specific example of a block diagram when a digital signal is used as a sound source. An acoustic system 200 according to the vehicle speaker system according to the present embodiment includes a sound source 30, a signal generation unit 70, and a speaker 20. The signal generating unit 70 includes a filter unit 40, a D / A conversion unit 50, and an amplification unit 60. As described above, the speaker 20 includes the first speaker 21, the right second speaker 22R, and the left second speaker 22L.

  The sound source 30 includes a right sound source 32R that outputs a right digital signal and a left sound source 32L that outputs a left digital signal. The sound source 30 may be a digital sound source that stores digital signals such as a non-volatile memory, a hard disk, and a CD-ROM, or an analog sound source that stores analog signals, such as an audio tape, and an analog signal from the analog sound source is digitized. It may consist of an A / D converter.

  The right digital signal output from the right sound source 32R of the sound source 30 is input to the right high-pass filter 42R and the signal mixing unit 43 of the filter unit 40, respectively. The right-side high-pass filter 42R is a second right-side filter that becomes an analog signal in the second frequency band consisting of a middle range of 150 Hz to less than 5000 Hz and a high range of 5000 Hz to less than 20 kHz when analogized based on the input right digital signal. A digital signal is generated and this second right digital signal is output.

  The left digital signal output from the left sound source 32L of the sound source 30 is input to the left high-pass filter 42L and the signal mixing unit 43 of the filter unit 40, respectively. The left-side high-pass filter 42L is a second left-side analog signal that becomes an analog signal in the second frequency band consisting of a mid-frequency range of 150 Hz to 5000 Hz and a high frequency range of 5000 Hz to less than 20 kHz when analogized based on the input left digital signal. A digital signal is generated and this second left digital signal is output.

  Based on the input right digital signal and left digital signal, the signal mixing unit 43 generates a mixed digital signal that is a sound in which the left and right sounds are mixed when analogized, and outputs the mixed digital signal. The hybrid digital signal output from the signal hybrid unit 43 is input to the low pass filter 41. The low-pass filter 41 is a first digital signal that becomes an analog signal in a first frequency band consisting of an ultra-low frequency range of 20 Hz to less than 60 Hz and a low frequency range of 60 Hz to less than 150 Hz when analogized based on the input hybrid digital signal. A signal is generated and this first digital signal is output.

  The filter unit 40 is a part of the function of the digital signal processor, but as another function of the digital signal processor, a signal that delays the second right digital signal and the second left digital signal from the first digital signal. Delay means may be provided.

  The D / A converter 50 includes three D / A converters, that is, a right second D / A converter 52R, a left second D / A converter 52L, and a first D / A converter 51. The right second D / A converter 52R receives the right second digital signal, and the right second D / A converter 52R is an analog signal in the second frequency band based on the input right second digital signal. A second analog signal is generated and this right second analog signal is output. Since the frequency band is inevitably expanded during D / A conversion, the second analog signal on the right side has a low intensity but includes a sound of less than 20 Hz and a sound of 150 Hz or more. The same applies to other D / A conversions. The left second digital signal is input to the left second D / A converter 52L, and the left second D / A converter 52L is an analog signal in the second frequency band based on the input left second digital signal. A second analog signal is generated and the left second analog signal is output. A first digital signal is input to the first D / A converter 51, and the first D / A converter 51 receives a first analog signal that is an analog signal in the first frequency band based on the input first digital signal. Generate and output the first analog signal. In this way, three types of analog signals are output from the D / A converter 50.

  The amplifying unit 60 includes three amplifiers, that is, a right second amplifier 62R, a left second amplifier 62L, and a first amplifier 61. The right second amplifier 62R receives the right second analog signal, and the right second amplifier 62R amplifies the intensity thereof to generate the right second electric signal, and outputs the right second electric signal. The left second amplifier 62L receives the left second analog signal, the left second amplifier 62L amplifies the intensity thereof to generate the left second electric signal, and outputs the left second electric signal. A first analog signal is input to the first amplifier 61. The first amplifier 61 amplifies the intensity thereof to generate a first electric signal, and outputs the first electric signal. Thus, three types of electrical signals are output from the amplifying unit 60.

  The right second electrical signal is input to the right second speaker 22R, and a sound pressure AP constituting the right sound in the second frequency band is generated. The second left electrical signal is input to the second left speaker 22L, and a sound pressure AP constituting the left sound in the second frequency band is generated. The first electric signal is input to the first speaker 21, and the sound pressure AP constituting the sound in the first frequency band is generated. Although the first frequency band includes a low frequency band, as described above, the back pressure BP of the first speaker 21 is exhausted to the front space SE outside the vehicle interior, so the first speaker 21 requires a special enclosure. Therefore, the sound in the low frequency band can be generated efficiently.

  FIG. 3 is a graph conceptually showing the band distribution of the sound pressure AP generated from each of the speakers included in the vehicle speaker system according to a preferred example of the embodiment of the present invention. In FIG. 3, the broken line is a graph showing the frequency distribution of the sound generated by the first speaker 21, and the solid line is the frequency distribution of the sound generated by the second speaker 22 (the right second speaker 22R, the left second speaker 22L). It is a graph to show. As shown in FIG. 3, the first speaker 21 appropriately covers the first frequency band, and the second speaker 22 appropriately covers the second frequency band. Therefore, the vehicular speaker system according to an embodiment of the present invention has a relatively simple configuration with three speakers, and the seat 80 in a state in which a clear sound image is secured over a wide frequency band while ensuring a sense of localization. Can be provided to passengers seated in the. In the graph shown in FIG. 3, it is shown that the second speaker 22 (the right second speaker 22R, the left second speaker 22L) can generate the sound pressure AP satisfactorily in a band exceeding about 20 kHz and about 40 kHz. Has been. Thus, the second speaker 22 (the right second speaker 22R, the left second speaker 22L) may be able to generate sound pressure AP in a frequency band higher than the second frequency band.

  FIG. 4 is a cross-sectional view conceptually showing the structure of the speaker included in the vehicle speaker system according to the embodiment of the present invention. The structure will be described by taking the first speaker 21 which is one of the speakers 20 as a specific example. Various members are attached to the frame 11 having a substantially truncated cone shape in the first speaker 21. The frame 11 has an annular portion 11a on the outer peripheral side and a spoke-like support portion 11c extending from the annular portion 11a. The support portion 11c is drawn with a dotted line having a notch hole 11b for convenience in the drawing.

  The diaphragm 12 for generating the sound pressure AP in the first speaker 21 has a substantially frustoconical shape, and has an edge 12 a on the outer peripheral side, and the edge 12 a is attached to the annular portion 11 a of the frame 11. In the first speaker 21 shown in FIG. 4, specifically, the edge 12a is bonded to the annular portion 11a of the frame 11 with an adhesive. By being supported by the frame 11 in this manner, the diaphragm 12 can vibrate along the front-rear direction of the frame 11 (the X1-X2 direction in FIG. 4).

  The diaphragm 12 has an opening (diaphragm opening) 12b at the center. A circular cap 13 is attached to the diaphragm 12 so as to close the inner peripheral side of the diaphragm 12 including the diaphragm opening 12b.

  A magnetic circuit portion 14 is attached to the top portion (magnetic circuit attachment portion 11d) of the support portion 11c having a substantially truncated cone shape of the frame 11. The magnetic circuit portion 14 has a columnar center pole portion 14a, and the center axis of the center pole portion 14a faces the vibration direction (X1-X2 direction) of the diaphragm 12. A bottom plate portion 14b is integrally provided around the center pole portion 14a on the X1-X2 direction X2 side, and an annular magnet 14c is attached to the X1-X2 direction X1 side of the bottom plate portion 14b portion. An annular top plate portion 14d is attached to the X1-X2 direction X1 side of the magnet 14c. By providing the magnet 14c, an annular magnetic gap 14e is formed between the center pole portion 14a and the top plate portion 14d. The bottom plate portion 14b and the top plate portion 14d form a yoke portion.

  A cylindrical bobbin 15 is fixed to the X1-X2 direction X2 side of the diaphragm 12. As shown in FIG. 4, the bobbin 15 is inserted into the magnetic gap 14 e of the magnetic circuit unit 14 located on the rear side (X1-X2 direction X2 side) of the diaphragm 12. A voice coil 16 is wound on the side surface of the portion of the bobbin 15 inserted into the magnetic gap 14e. When the bobbin 15 reciprocates in the X1-X2 direction according to the current flowing through the voice coil 16 located in the magnetic gap 14e, the diaphragm 12 vibrates, and the sound is moved from the diaphragm 12 to the X1-X2 direction X1 side. The pressure AP is generated, and the back pressure BP is discharged to the X1-X2 direction X2 side. The basic structure of the two second speakers 22 (the right second speaker 22R and the left second speaker 22L) is also the same as that of the first speaker 21, and the area of the diaphragm 12 is larger than the area of the diaphragm 12 of the first speaker 21. small.

  A damper 17 is located between the diaphragm 12 and the magnetic circuit unit 14 in the vibration direction (X1-X2 direction). The damper 17 is supported by the support portion 11 c of the frame 11 on the outer peripheral edge side, and supports the bobbin 15 on the inner peripheral edge side. As the bobbin 15 reciprocates, not only the diaphragm 12 but also the damper 17 reciprocates in the vibration direction (X1-X2 direction). The damper 17 is formed of an elastic member, and has a function of returning the bobbin 15 to the neutral position by an elastic recovery force when no current flows through the voice coil 16.

  The first speaker 21 having such a configuration emits a normal-phase sound pressure AP to the vehicle interior space S1 side by causing a current to flow through the voice coil 16 to vibrate the diaphragm 12, and thus the front space SE outside the vehicle interior. The sound pressure (back pressure) BP having the opposite phase can be discharged to the side.

  Although this embodiment and its application example were demonstrated above, this invention is not limited to these examples. For example, those in which the person skilled in the art appropriately added, deleted, or changed the design of the above-described embodiments or application examples thereof, or combinations of the features of the embodiments as appropriate are also included in the present invention. As long as the gist is provided, it is included in the scope of the present invention.

  For example, there may be a plurality of first speakers 21. However, since the directivity of the sound in the first frequency band is not higher than that of the sound in the second frequency band, for example, two sounds of the first speaker 21 are prepared and the sound is divided into one rather than left and right. It is preferable to reduce the volume of the entire first speaker 21.

  The second speaker 22 may be provided on the door. Even in this case, it is preferable that the sound pressure AP is disposed so as to be radiated rearward (X1-X2 direction X1 side) in the center or above in the height direction of the door.

  When the second speaker 22 is provided on the door, the door interior space is narrower than the instrument panel 90 interior space. Therefore, the degree of freedom in designing the structure of the second speaker 22 itself and the arrangement of the second speaker 22 in the door. The degree of design freedom is relatively low. When the second speaker 22 is provided on the door and the second electric signal is transmitted to the second speaker 22 by wire, wiring for transmitting the second electric signal to or around the door hinge is required. Therefore, it may be preferable that the second speaker 22 is not provided on the door from the viewpoint of improving the assemblability at the time of manufacture and the design of the door hinge.

  The second speaker 22 may be composed of a group of speakers. For example, the right second speaker 22R may be composed of two or more speakers. In this case, sound pressure APs in different frequency bands may be radiated from the respective speakers. As a specific example in such a case, a case where a mid-range speaker is arranged in the instrument panel 90 and a high-frequency speaker is arranged in the A pillar 120 is given.

  The speaker 20 is not limited to the configuration in which the bobbin 15 is driven by the voice coil 16 as shown in FIG. In such a configuration, the relationship between the arrangement of the diaphragm 12 and the magnetic circuit unit 14 and the radiation direction of the sound pressure AP is arbitrary. The sound pressure AP may be radiated to the diaphragm 12 side as shown in FIG. 4, or may be radiated to the magnetic circuit unit 14 side (X1-X2 direction X2 side in FIG. 4).

100 Vehicle 110 Front partition plate 90 Instrument panel (instrument panel)
80 seat 80R right seat 80L left seat 80b backrest portion 80Rb right seat backrest portion 80Lb left seat backrest portion 21 first speaker 22 second speaker 22R right second speaker 22L left second speaker AP sound pressure BP back pressure 200 sound system 30 sound source 70 Signal Generator 20 Speaker 40 Filter 50 D / A Converter 60 Amplifier 32R Right Sound Source 32L Left Sound Source 42R Right High Pass Filter 42L Left High Pass Filter 43 Signal Mixing Unit 41 Low Pass Filter 52R Right Second D / A Converter 52L Left First 2D / A converter 51 1st D / A converter 62R right second amplifier 62L left second amplifier 61 first amplifier 11 frame 11a annular part 11b notch hole 11c support part 11d magnetic circuit Attached part 12 Diaphragm 12a Edge 12b Diaphragm opening 13 Cap 14 Magnetic circuit part 14a Center pole part 14b Bottom plate part 14c Magnet 14d Top plate part 14e Magnetic gap 15 Bobbin 16 Voice coil 17 Damper S1 Car interior space SE Car exterior space SX Lower space outside the vehicle 91 Center console 130 Lower partition plate 120 Front pillar (A pillar)

Claims (4)

A vehicle speaker system used in a vehicle in which a vehicle interior space and a vehicle exterior space are separated by a vehicle partition plate, an instrument panel is installed on the front side of the vehicle interior space, and a seat is installed in the vehicle interior space. ,
20 Hz or more and less than 60 Hz as a very low frequency, 60 Hz or more and less than 150 Hz as a low frequency, 150 Hz or more and less than 5000 Hz as a middle frequency range, 5000 Hz or more and 20 kHz or less as a high frequency range,
Installed at a position in front of the seat back portion of the vehicle partition plate and driven backward by the first electric signal corresponding to the first frequency band including the ultra low frequency range and the low frequency range to face the vehicle interior space A first speaker having a large area that radiates sound pressure and exhausts back pressure to the vehicle exterior space;
The instrument panel, a front pillar provided on the side of the instrument panel, and at least one selected from the group consisting of doors are installed at positions in front of the backrest, and the middle region and the high region are A vehicular speaker system comprising: a second speaker having a small area that is driven by a second electric signal corresponding to a second frequency band including the second speaker and radiates sound pressure backward in the vehicle interior space. The first speaker is located in front of the second speaker;
The distance from the back portion of the seat to the first speaker is set to be longer than the distance from the back portion of the seat to the second speaker,
2. The vehicle speaker system according to claim 1, wherein driving of the second speaker by the second electric signal is delayed from driving of the first speaker by the first electric signal. The vehicle partition plate includes a front partition plate that separates the vehicle exterior space and the vehicle interior front space located in front of the vehicle interior space,
The vehicle speaker system according to claim 1, wherein the first speaker is installed on the front partition plate. 4. The vehicle according to claim 1, wherein the second speaker is provided in at least one selected from the group consisting of the instrument panel and the front pillar, and is not provided in the door. 5. Speaker system.

Images