JP2007281534A - Acoustic device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an acoustic device for vehicles capable of securing surrounding feeling regardless of the difference in a boarding position, by adjusting the delay time of the sound in a center speaker corresponding to the boarding position. <P>SOLUTION: There are a speaker unit 32 for two rows of sheets arranged in front and back, and a sound source 24 for outputting a stereo sound signal to the speaker unit 32. The speaker unit 32 is composed of side speakers 27, 28 provided in regions of both the left and right sides of a relative front row sheet, and a center speaker 29 provided in the center region in the vehicle widthwise direction of the relative front row sheet. Between the sound source 24 and the center speaker 29, a monaural sound generation means is provided for generating a monaural sound signal from the stereo sound signal. The monaural sound generation means has a delay means 35 for changing the delay time of the monaural sound signal outputted to the center speaker 29 according to the boarding position detected by a boarding position detection means 18. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  According to the present invention, in a vehicle having a plurality of seats in the front and rear (two rows in the front and rear, or three or more rows in the front and rear), a speaker unit for the two rows of seats arranged in the front and rear direction is provided. The present invention relates to a vehicle acoustic device.

Conventionally, as a vehicle acoustic apparatus of the above-mentioned example, there is one disclosed in Patent Document 1.
That is, while a speaker is arranged on each of the front left, front right, rear left, and rear right in the passenger compartment, a boarding position recognition unit that recognizes the distribution of passengers is provided, and the passenger boarding detected by the boarding position recognition unit In accordance with the position distribution, the control unit automatically adjusts the volume (so-called volume) of acoustic signals for a total of four speakers.

  In this conventional structure, the volume balance adjustment operation that adjusts the distribution of the reproduced sound field according to the distribution arrangement of the passengers is automated, and the balance adjustment is always performed reliably and appropriately in response to fluctuations in the distribution arrangement of the passengers. A sound field can be formed. However, in this prior art, nothing is disclosed about the point of providing a center speaker and the technical idea of adjusting the delay time of the center speaker.

  By the way, two rows of seats arranged in the front-rear direction are targeted (the front seat in the first row and the rear seat in the second row are targeted, or the rear seat in the second row and the rear seat in the third row are The left and right side speakers are provided in the left and right side regions of the seat in the front row, and one center speaker is provided in the center region in the vehicle width direction of the seat in the front row. It is conceivable to provide it.

  In this case, since the distance between the passenger and the center speaker is shorter than the distance between the passenger seated in the center of the seat in the front row and the side speaker, the sound from the center speaker is from the left and right side speakers. If the sound is output with a slight delay, a sound field having a three-dimensional surround sound with respect to stereo sound can be obtained.

  However, when the delay amount of the sound from the center speaker is set uniformly, there is a problem that it is not possible to ensure an appropriate surround feeling corresponding to the boarding position.

  In other words, not only the distance to the center speaker is significantly different between an occupant seated in the center of the seat in the front row and an occupant seated in the center of the seat in the rear row. Since the ratio between the distance and the distance to the side speaker is different, there is a problem that it is difficult to secure an appropriate surround feeling corresponding to the boarding position with a uniform delay amount.

JP 2001-37000 A

  Therefore, the present invention provides side speakers in the left and right side regions of the seats in the front row, and provides a center speaker in the center region in the vehicle width direction of the seats in the front row, between the sound source and the center speakers. Includes a monaural sound generating means for generating a monaural sound signal from a stereo sound signal, and the monaural sound output to the center speaker according to the boarding position detected by the boarding position detecting means by the delay means of the monaural sound generating means. It is an object of the present invention to provide a vehicular acoustic device that can secure a surround feeling regardless of the boarding position by changing the delay time of the audio signal.

  The vehicle acoustic device according to the present invention, in a vehicle having a plurality of front and rear rows of seats, outputs a speaker unit that targets two rows of seats arranged at the front and rear, and a stereo audio signal to the speaker unit. A sound source and a boarding position detecting means for detecting a boarding position of the occupant in the two rows of seats are provided, and the speaker unit is relatively connected to side speakers provided in the left and right side regions of the seats in the front row. Monaural sound generating means for generating a monaural sound signal from a stereo sound signal between the sound source and the center speaker. The monaural sound generating means is provided and outputs to the center speaker in accordance with the boarding position detected by the boarding position detecting means. Those having a delay means for changing the delay time of Lal of the audio signal.

According to the above configuration, the sound source outputs a stereo sound signal to the side speakers provided in the left and right side regions of the seat in the front row, and generates monaural sound provided between the sound source and the center speaker. Since the means generates a monaural audio signal from the stereo audio signal and outputs the monaural audio signal to the center speaker, a sound field having a three-dimensional surround feeling can be obtained with respect to the stereo audio.
Moreover, the delay means changes the delay time of the monaural audio signal output to the center speaker in accordance with the boarding position detected by the boarding position detection means for detecting the boarding position of the occupant in the two rows of seats. An appropriate surround feeling can be ensured regardless of the difference in the riding position of the occupant with respect to the row seats.

In one embodiment of the present invention, when the occupant is detected only in the relative front row by the riding position detection means, the delay means is more delayed than when the occupant is detected only in the relative rear row. Is to lengthen.
According to the above configuration, when the occupant is detected only in the relative front row by the riding position detection means, the delay means increases the delay time of the monaural audio signal output to the center speaker. In addition, it is possible to secure a surround feeling in a relative front seat close to the center speaker.

In one embodiment of the present invention, an airbag device that is deployed corresponding to a boarding position is provided, and the boarding position detecting means is constituted by a weight sensor of an airbag device provided on the seat. .
According to the above configuration, since the weight sensor of the airbag device is also used as the boarding position detection means of the vehicle acoustic device, the existing sensor can be used effectively, and as a result, the cost can be reduced.

In one embodiment of the present invention, the monaural sound generating means includes volume adjusting means, and the sound volume adjusting means has a relative rear row when the boarding position detecting means detects a boarding only in a relative front row. The volume is reduced more than when an occupant is detected only in the vehicle.
According to the above configuration, the volume control means reduces the volume of the center speaker when the boarding is detected only in the relative front row, and the volume control means sets the volume of the center speaker when the boarding is detected only in the relative back row. Can be increased.

As a result, it is possible to suppress a phenomenon that the surround sound is lowered due to the monaural sound from the center speaker being too strong or too weak depending on the boarding position.
By the way, when the boarding is detected only in the relative front row, if the volume of the center speaker is high, the sounds of the left and right side speakers are erased, but the above configuration can eliminate such problems. it can.

In one embodiment of the present invention, the center speaker is provided on the ceiling of the vehicle.
According to the above configuration, there is no obstacle between the center speaker and the occupant that prevents the sound from propagating, so the sound from the center speaker does not become a reflected sound, and it is good for the listening point (occupant) as a direct sound. Communicated.

In one embodiment of the present invention, the boarding position detecting means detects a passenger occupant distribution with respect to a relative front row and a relative rear row, and the delay means has a large occupant distribution to the front row. In some cases, the delay time is made longer than when there are many occupant distributions in the rear row.
According to the above configuration, the delay means increases the delay time of the monaural audio signal output to the center speaker when it is detected by the boarding position detection means that the distribution of the passengers on the front row is large. The surround feeling can be ensured in the relative front seat closer to the center speaker than the relative rear seat.
That is, it is possible to obtain an appropriate surround feeling corresponding to not only the presence / absence of occupants in the front and rear rows of seats but also the size of the occupant distribution when a large number of passengers are on board.

  According to the present invention, the side speakers are provided in the left and right regions of the seats that are relatively in the front row, and the center speakers are provided in the center region in the vehicle width direction of the seat that is relatively in the front row. Includes a monaural sound generating means for generating a monaural sound signal from a stereo sound signal, and the monaural sound output to the center speaker according to the boarding position detected by the boarding position detecting means by the delay means of the monaural sound generating means. Since the delay time of the audio signal is changed, there is an effect that it is possible to ensure a surround feeling regardless of the boarding position.

In vehicles equipped with multiple rows of seats in the front and rear, the purpose is to adjust the delay time of the sound of the center speaker according to the boarding position of the occupant and ensure an appropriate surround feeling regardless of the difference in the boarding position A speaker unit for two rows of seats arranged at the front and rear, a sound source for outputting a stereo audio signal to the speaker unit, and a boarding position detecting means for detecting a passenger's boarding position on the two rows of seats The speaker unit is composed of side speakers provided in the left and right side regions of the seat in the front row and a center speaker provided in the center region in the vehicle width direction of the seat in the front row, Provided between the sound source and the center speaker is a monaural sound generating means for generating a monaural sound signal from a stereo sound signal;
The monaural sound generating means is realized by a configuration including delay means for changing the delay time of the monaural sound signal output to the center speaker in accordance with the boarding position detected by the boarding position detecting means.

An embodiment of the present invention will be described in detail with reference to the drawings.
The drawings show a vehicle acoustic device. In FIG. 1 shown in a plan view and in FIG. 2 shown in a side view, a plurality of rows of seats 2, 3, and 4 are arranged above the floor panel 1 so as to be spaced apart in the front-rear direction. ing.

  The front seat 2 in the first row has a driver's seat 5 and a passenger seat 6 arranged side by side in the vehicle width direction. These seats 5, 6 are seat cushions 5c, 6c and seat backs 5b, 6b. The headrests 5h and 6h are provided.

  The rear seat 3 in the second row has left and right separate seats 7, 8 and a center seat 9 arranged in the vehicle width direction, and these seats 7, 8, 9 are seat cushions 7c, 8c, 9c, seat backs 7b, 8b, 9b and headrests 7h, 8h, 9h. The rear seat 3 in the second row may employ a bench-type seat instead of a separate seat.

  The rear seat 4 in the third row is composed of a bench-type seat including a seat cushion 4c, a seat back 4b, and a plurality of headrests 4h. The rear seat 4 in the third row is a bench-type seat. A sheet having a separate structure may be used instead of the sheet.

  On the other hand, a driver's seat airbag device 11 is built in the steering wheel 10 located in front of the driver's seat 5. A passenger seat airbag device 13 is built in the instrument panel 12 corresponding to the front of the passenger seat 6.

  Further, side airbag devices 14, 15, and 16 are disposed in the left and right regions of the plurality of rows of sheets 2, 3, and 4, respectively. Each of these side airbag devices 14, 15, 16 is built in a roof rail, and an airbag unit 17 (which protects an occupant in the event of a vehicle collision by the above-described airbag devices 11, 13, 14, 15, 16). (See FIG. 3).

  The seat cushions 5c, 6c, 7c, 8c, 9c, and 4c of the seats 2, 3, and 4 are respectively weight sensors as riding position detection means for detecting the riding position of the passenger or the distribution of the passengers. 18 ... are incorporated.

By the way, an audio visual unit 20 (so-called AV) having an input terminal 19 is provided at the center of the instrument panel 12 in the vehicle width direction.
The audio visual unit 20 includes a playback device 21, a controller 22, an amplifier (so-called stereo amplifier) 23, and an audio CPU 24 shown in FIG. 3. As the playback device 21, a CD, DVD, MD, cassette tape recorder, or the like is used. The input terminal 19 can be connected to a CD, a game machine, or other external device. Further, the controller 22 adjusts the volume according to the passenger's preference, and the frequency characteristics of the acoustic signal. Equipped with an equalizer to adjust.

  As shown in FIGS. 1 and 2, left and right door speakers 25 and 26 are provided in both the left and right regions of the front seat 2 in the first row. These left and right door speakers 25 and 26 are built in the left and right front doors.

  The vehicle acoustic device of this embodiment is intended for two rows of rear seats 3 and 4 arranged in front and rear, and is provided in the left and right regions of the second row of rear seats 3 that are relatively front rows. Are provided with side speakers 27 and 28. These left and right side speakers 27 and 28 are built in the left and right sliding doors (rear doors).

In addition, a center speaker 29 is provided in the center region in the vehicle width direction of the rear row 3 of the second row, which is a relatively front row. The center speaker 29 is provided on the vehicle compartment side of the roof portion 30 of the vehicle as shown in FIG. 2, and a display as a display means for displaying a television image or a game image is displayed immediately before the center speaker 29. 31 is provided. The speaker units 25, 26, 27, 28, and 29 described above constitute a speaker unit 32 shown in FIG.
Further, the roof portion 30 of the vehicle is provided with an antenna 33 for receiving radio waves for a television receiver and / or a radio receiver.

  FIG. 3 is a block diagram of an audio device for a vehicle. A playback device 21, an antenna 33, an input terminal 19, and a controller 22 are connected to the input side of the audio CPU 24, while a display 31 and an amplifier 23 are connected to the output side of the audio CPU 24. Is connected.

The above-described amplifier 23 amplifies an analog signal from the audio CPU 24. The amplifier 23 may be composed of both a preamplifier and a power amplifier (main amplifier).
Left and right door speakers 25 and 26 and left and right side speakers 27 and 28 are connected to the output stage of the amplifier 23, respectively.

  Further, a delay line as a delay means is provided between the output side of the audio CPU 24 as a sound source and the side speakers 27 and 28, more specifically, a branch line 34 branched from the output stage of the amplifier 23 and the side speakers 27 and 28. By connecting a circuit 35 (so-called delay circuit) and connecting the above-described center speaker 29 to the output side of the delay circuit 35, the center speaker 29 is selected according to the boarding position or the passenger distribution detected by the weight sensor 18. The delay time of the monaural audio signal to be output to is changed.

  FIG. 4 is a circuit diagram showing the main part of FIG. 3 in more detail, and a monaural sound generating means for generating a monaural sound signal from a stereo sound signal between the branch line 34 and the center speaker 29 described above. 36 is interposed.

  The monaural sound generation means 36 includes an interface 37, a filter 38 connected to the output side of the interface 37, the delay circuit 35 described above connected to the output side of the filter 38, the filter 38 and the delay circuit 35. And a microcomputer 39 to be controlled.

  The above-described filter 38 is configured by a digital filter that extracts a common component from stereo audio signals to the left and right side speakers 27 and 28 on the output side of the amplifier 23. The filter 38 includes a monaural audio generation unit and a center speaker 29. It also serves as a volume control means.

  In the above-described microcomputer 39, the weight sensors 18 (however, in FIG. 4, the weight sensors 18 of the seat cushions 5c, 6c, 7c, 8c, 9c, and 4c of FIG. 1 are collectively shown as one. ) And the audio CPU 24 are connected, and the microcomputer 39 is configured to control the delay circuit 35 and the filter 38.

  That is, the delay circuit 35 described above is controlled by the microcomputer 39 so that the weight sensor 18 detects the occupant A (see FIG. 2) only in the second row of rear seats 3 (relatively in the front row). When the occupant B (see FIG. 2) is detected only in the rear seat 4 in the third row (relatively the rear seat), the delay time of the monaural audio signal output to the center speaker 29 is reduced. Lengthen.

  Conversely, when the occupant B (see FIG. 2) is detected only in the rear seat 4 in the third row (relatively the rear seat), the second row rear seat 3 (relatively the front seat). The delay time of the monaural audio signal output to the center speaker 29 is made shorter than when only the occupant A (see FIG. 2) is detected.

  Further, when seating of occupants A and B is detected in both the rear seat 3 in the second row and the rear seat 4 in the third row, the delay time of the monaural audio signal output to the center speaker 29 is set to an intermediate level. It is what you make with the value.

  5 is a plan view showing the distance relationship between the left and right side speakers 27 and 28, the center speaker 29, and the heads a and b of the passengers A and B shown in FIG. The distance between the part a and the center speaker 29 is L0, the distance between the head a of the occupant A and the left and right side speakers 27 and 28 is L2 and L3 (where L2 = L3), and the head b of the occupant B The distance to the center speaker 29 is L1, and the distance between the head b of the occupant B and the left and right side speakers 27 and 28 is L4 and L5 (where L4 = L5).

As apparent from FIG. 5, the relationship is L0 <L2, L0 <L3, L0 <L1, and the distance ratio L0 / L3 (or L0 / L2) is smaller than the ratio L1 / L5 (or L1 / L4). It becomes a relationship.
For this reason, when the occupant A is detected only in the rear seat 3 in the second row, it is output to the center speaker 29 relatively as compared to when the occupant B is detected only in the rear seat 4 in the third row. The delay time of the monaural audio signal is increased, and the sound that reaches the occupant A from the left and right side speakers 27 and 28 and the sound that reaches the occupant A from the center speaker 29 are set to be substantially the same, so that the surround feeling Is to secure.

  Similarly, when the occupant B is detected only in the rear seat 4 in the third row, it is output to the center speaker 29 relatively compared to when the occupant A is detected only in the rear seat 3 in the second row. The delay time of the monaural audio signal is shortened, and the sound that reaches the occupant B from the left and right side speakers 27 and 28 and the sound that reaches the occupant B from the center speaker 29 are set to be substantially the same, so that the surround feeling Is to secure.

  Control of the delay time by the delay circuit 35 described above is not limited to the presence or absence of a passenger seated on the rear seats 3 and 4, but when a large number of people are on the rear seats 3 and 4, the rear seats 3 and 4 When the occupant distribution is detected by the respective weight sensors 18 and the occupant distribution on the second row seat 3 is large, the third row seat 4 is compared with the case where the occupant distribution on the third row seat 4 is large. An appropriate surround feeling can be secured by increasing the delay time corresponding to the passenger distribution.

  The microcomputer 39 described above controls the delay time of the delay circuit 35, and also controls the filter 38 that also receives the output from each weight sensor 18 and also serves as a volume adjusting means.

  That is, the above-described filter 38 is controlled by the microcomputer 39 so that the weight sensor 18 detects the occupant A (see FIG. 2) only in the second row of the rear seats 3 (relatively the front row seats). In some cases, the sound volume with respect to the center speaker 29 is reduced more than when the occupant B (see FIG. 2) is detected only in the rear seat 4 in the third row (the seat in the relatively rear row).

Conversely, when the occupant B (see FIG. 2) is detected only in the rear seat 4 in the third row (relatively the rear seat), the second row rear seat 3 (relatively the front seat). Only when the occupant A (see FIG. 2) is detected, the volume of the center speaker 29 is increased.
Further, when seating of the occupants A and B is detected in both the rear seat 3 in the second row and the rear seat 4 in the third row, the sound volume with respect to the center speaker 29 is an intermediate value.

  The volume control by the filter 38 is not limited to the presence / absence of passengers in the rear seats 3 and 4; When detected by the weight sensor 18 and the occupant distribution of the second row seat 3 is large, the sound volume with respect to the center speaker 29 is reduced as compared with the case where the occupant distribution of the third row seat 4 is large, When the volume of passengers in the third row seat 4 is large, when the volume of the center speaker 29 is increased as compared with the case where the passenger distribution of the second row seat 3 is large, the center speaker 29 can be used even when a large number of passengers are riding. It is possible to prevent a decrease in surround sound due to excessive or insufficient monaural sound from the speaker 29.

  As described above, the vehicle acoustic apparatus according to the above embodiment includes a speaker unit 32 that targets two rows of seats 3 and 4 arranged in the front and rear in a vehicle including a plurality of rows of seats in the front and rear, and the speaker. A sound source (see the audio CPU 24) for outputting a stereo audio signal to the unit 32, and boarding position detection means (see the weight sensor 18) for detecting the boarding position of the occupant in the two rows of seats 3 and 4 are provided. The speaker unit 32 includes side speakers 27 and 28 provided in the left and right regions of a seat in the front row (see the rear seat 3 in the second row) and a seat in the front row (second row). A center speaker 29 provided in the center region in the vehicle width direction of the rear seat 3), and the sound source (see the audio CPU 24) and the center speaker 29 In addition, a monaural sound generating means 36 for generating a monaural sound signal from a stereo sound signal is provided, and the monaural sound generating means 36 corresponds to the boarding position detected by the boarding position detecting means (see the weight sensor 18). And a delay means (see delay circuit 35) for changing the delay time of the monaural audio signal output to the center speaker 29.

  According to this configuration, the sound source (refer to the audio CPU 24) is stereo-sound with respect to the side speakers 27 and 28 provided in the left and right side regions of the seat in the front row (see the rear seat 3 in the second row). The monaural sound generation means 36 that outputs a signal and is provided between the sound source (audio CPU 24) and the center speaker 29 generates a monaural sound signal from the stereo sound signal, and the monaural sound signal is output to the center speaker 29. Therefore, it is possible to obtain a sound field having a stereoscopic effect with respect to stereo sound.

  Moreover, the delay means (see the delay circuit 35) is a center speaker 29 according to the boarding position detected by the boarding position detecting means (see the weight sensor 18) for detecting the boarding position of the occupant in the two rows 3 and 4. Since the delay time of the monaural audio signal to be output to is changed, an appropriate surround feeling can be ensured regardless of the difference in the occupant's boarding position with respect to the two rows of seats 3 and 4.

The delay means (refer to the delay circuit 35) is set to the relative position when the occupant is detected only in the relative front row (see the rear seat 3 in the second row) by the riding position detection means (see the weight sensor 18). The delay time is made longer than when an occupant is detected only in the rear row (see the rear seat 4 in the third row).
According to this configuration, when the occupant is detected only in the relative front row (see the rear seat 3 in the second row) by the riding position detection means (see the weight sensor 18), the delay means (see the delay circuit 35) is the center. Since the delay time of the monaural audio signal output to the speaker 29 is increased, a surround feeling is ensured in the relative front seat (see the rear seat 3) closer to the center speaker 29 than in the relative rear seat (see the rear seat 4). be able to.

Further, airbag devices 15 and 16 that are deployed corresponding to the boarding positions are provided, and the boarding position detecting means is constituted by weight sensors 18 of the airbag devices 15 and 16 provided on the seats 3 and 4. Is.
According to this configuration, since the weight sensor 18 of the airbag device 15 or 16 is also used as the boarding position detecting means of the vehicle acoustic device, the existing sensor can be used effectively, and as a result, the cost is reduced. be able to.

In addition, the monaural sound generation means 36 includes volume control means (see filter 38), and the sound volume control means filter 38 is relatively front row (second row) by the riding position detection means (see weight sensor 18). When the vehicle is detected only in the rear seat 3), the volume is reduced more than when the passenger is detected only in the relative rear row (see the rear seat 4 in the third row).
According to this configuration, the volume adjusting means (see the filter 38) reduces the volume of the center speaker 29 when the boarding is detected only in the relative front row (the rear seat 3 in the second row), and the relative rear row ( When the boarding is detected only in the rear seat 4) in the third row, the volume adjusting means (see the filter 38) can increase the volume of the center speaker 29.

As a result, it is possible to suppress the phenomenon that the surround sound is lowered due to the monaural sound from the center speaker 29 being too strong or too weak depending on the boarding position.
Incidentally, when the boarding is detected only in the relative front row (rear seat 3), if the volume of the center speaker 29 is high, the sounds of the left and right side speakers 27 and 28 are erased. Can solve the problem.

The center speaker 29 is provided on the ceiling of the vehicle (see the roof portion 30).
According to this configuration, since there is no obstacle between the center speaker 29 and the occupant that prevents the sound from propagating, the sound from the center speaker 29 does not become a reflected sound and is directly reflected on the listening point (occupant). Good transmission.

Further, the boarding position detecting means (see the weight sensor 18) detects the distribution of passengers in the relative front row (second row rear seat 3) and relative rear row (third row rear seat 4). When the relative occupant distribution to the front row (rear seat 3) is large, the delay means (see the delay circuit 35) has a delay time compared to the case when the occupant distribution to the relative rear row (rear seat 4) is large. Is to lengthen.
According to this configuration, when it is detected by the boarding position detection means (weight sensor 18) that the distribution of passengers on the front row (rear seat 3) is relatively large, the delay means (delay circuit 35) is the center speaker. Since the delay time of the monaural audio signal output to 29 is increased, it is possible to secure a surround feeling in the relative front seat (rear seat 3) closer to the center speaker 29 than in the relative rear seat (rear seat 4). .
That is, it is possible to obtain an appropriate surround feeling corresponding to not only the presence or absence of passengers in the front and rear two rows of seats 3 and 4, but also the size of the passenger distribution when a large number of passengers are on board.

  In addition, as shown in FIG. 2, if the center speaker 29 is provided at substantially the same location as the display 31, sound is emitted from substantially the same location as the display 31, so that it feels as if sound is heard from the display 31, A sense of incongruity when using the display 31 is eliminated.

  FIG. 6 shows another embodiment of the vehicle acoustic device. In the previous embodiment shown in FIGS. 1 to 5, the seat in the front row is set as the rear seat 3 in the second row, In FIG. 6, the rear row seat is set as the third row rear seat 4 and the two rows of seats 3 and 4 are shown. However, in this embodiment shown in FIG. The seat is set as the front seat 2 in the first row, the seat in the relatively rear row is set as the rear seat 3 in the second row, and these two rows of seats 2 and 3 are targeted.

That is, the left and right side speakers 27 and 28 are provided in the front door in the left and right regions of the front seat 2, and the center speaker 29 is provided on the vehicle compartment side of the roof portion 30 in the center region in the vehicle width direction of the front seat 2. If provided, the vehicle acoustic device for the two rows of seats 2 and 3 arranged in the front-rear direction can be configured using the configuration of the block diagram shown in FIG. 3 and the circuit diagram shown in FIG.
Even if configured in this manner, the same operations and effects as in the previous embodiment can be obtained. Therefore, in FIG. 6, the same parts as those in the previous figure are denoted by the same reference numerals, and detailed description thereof is omitted.

In the correspondence between the configuration of the present invention and the above-described embodiment,
The sound source of the present invention corresponds to the audio CPU 24 of the embodiment,
Similarly,
The boarding position detection means corresponds to the weight sensor 18,
The delay means corresponds to the delay circuit 35,
The volume control means corresponds to the filter 38,
The ceiling of the vehicle corresponds to the roof part 30,
The two rows of seats arranged at the front and rear correspond to the rear seats 3 and 4 or the seats 2 and 3,
The present invention is not limited to the configuration of the above-described embodiment.

  For example, since the sound source is a portion that outputs an analog signal, when a digital amplifier that converts and amplifies a digital signal to an analog signal and outputs it is used as the amplifier, this digital amplifier can be used as a sound source. .

  Further, as the boarding position detection means, other detection means such as an ultrasonic sensor or a CCD camera may be used instead of the weight sensor.

The top view of the vehicle provided with the audio equipment for vehicles of the present invention Vehicle side view Block diagram showing an acoustic device for a vehicle FIG. 3 is a circuit diagram showing the detailed configuration of the main part of FIG. Explanatory diagram showing the distance relationship between each speaker and passenger The top view which shows the other Example of the audio equipment for vehicles

Explanation of symbols

3, 4 ... Rear seat (seat)
15, 16 ... Airbag device 18 ... Weight sensor (boarding position detection means)
24 ... Audio CPU (sound source)
27, 28 ... side speakers 29 ... center speakers 30 ... roof (vehicle ceiling)
32 ... Speaker unit 35 ... Delay circuit (delay means)
36: Monaural sound generating means 38 ... Filter (volume adjusting means)

Claims (6)

In vehicles with multiple rows of seats on the front and back,
A speaker unit for two rows of seats arranged in front and back;
A sound source that outputs a stereo audio signal to the speaker unit;
Boarding position detecting means for detecting the boarding position of the occupant in the two rows of seats,
The speaker unit includes side speakers provided in the left and right side regions of the seat in the front row,
It is composed of a center speaker provided in the center region in the vehicle width direction of the seat that is relatively in the front row,
Between the sound source and the center speaker, monaural sound generating means for generating a monaural sound signal from a stereo sound signal is provided,
The monaural sound generating means includes a delay means for changing a delay time of a monaural sound signal output to a center speaker in accordance with the boarding position detected by the boarding position detecting means. 2. The vehicle according to claim 1, wherein when the occupant is detected only in a relative front row by the boarding position detection unit, the delay means makes the delay time longer than when the occupant is detected only in a relative rear row. Acoustic device. It has an airbag device that is deployed according to the boarding position,
The vehicle acoustic device according to claim 1, wherein the boarding position detection means includes a weight sensor of an airbag device provided on the seat. The monaural sound generating means includes volume control means,
The sound volume adjusting means reduces the sound volume when a boarding position is detected only in a relative front row by the boarding position detecting means, compared to when a passenger is detected only in a relative back row. The vehicle acoustic device according to claim 1. 5. The vehicle acoustic device according to claim 1, wherein the center speaker is provided on a ceiling of the vehicle. The boarding position detecting means detects the distribution of passengers in the relative front row and the relative rear row,
6. The delay means according to claim 1, wherein the delay means makes the delay time longer when the relative occupant distribution to the front row is greater than when the relative occupant distribution to the rear row is large. The vehicle acoustic device described in 1.

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