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JPH03283799

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DESCRIPTION JPH03283799
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
vehicle audio apparatus generally called a car stereo, and more particularly to a technology for
changing the directivity of a speaker to adjust the characteristics of a reproduced sound field.
(Prior Art) A narrow space in a car can not be said to be a good one as a sound field for
reproducing a music with a high sound quality and a rich sense of reality. In recent multi-speaker
systems, a large number of speakers are installed in the front, side, rear, etc. of the vehicle
interior, but since a large number of speakers and listeners are disposed in a narrow space, the
speakers and the listener The distance between persons is very short, and the positional
relationship with each speaker changes significantly depending on the position of the listener,
that is, the sitting position of the occupant. In addition, the propagation characteristics of the
sound in the passenger compartment also drastically change in the case of one passenger and in
the case of a large number of passengers. (Problems to be Solved by the Invention) In the
conventional vehicle acoustic apparatus, the volume ratio of each speaker of the multi-speaker
system can be freely adjusted, and the frequency characteristic can be freely mWJ by the
equalizer. The characteristics of the sound field can be corrected by appropriately adjusting these
according to changes in the number of listeners and the seating position. However, even in the
conventional device, there is no adjustment mechanism for changing the directivity characteristic
of the sound emitted from the speaker, which is very insufficient in that respect. For example,
when the driver listens alone, it is better to direct the sound from the rear speakers forward to
obtain a better stereo feeling. However, when a person sits in the rear seat with the directivity
characteristic, the sound from the rear speaker directly reaches the rear occupant's ear, and the
noise increases. It is easier for the rear seat occupants to hear the sound from the rear speakers
directed upward. In the conventional device, the arrangement of the speakers is determined so as
to have these moderate characteristics. The present invention has been made in view of the
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above-described conventional problems, and its object is to use an acoustic diffraction
mechanism such as an acoustic reflector or an acoustic lens to match the number of occupants
and the seating position of a passenger in a vehicle compartment from a speaker It is an object of
the present invention to provide a vehicle acoustic device capable of adjusting the directivity
characteristic of the emitted sound. (Means for Solving the Problems) In the vehicle acoustic
device according to the present invention, an acoustic diffraction is provided that is installed on
the front side of a speaker installed in a vehicle compartment and includes a movable portion
that changes directivity characteristics of sound emitted from the speaker Mechanism, an
actuator for driving and displacing the movable portion of the acoustic diffraction mechanism,
control means for controlling the actuator to displace the movable portion and positioning at an
arbitrary position, and a command corresponding to a selection input signal A position command
means is provided for giving a signal to the control means to position the movable part at a
commanded position.
(Operation) For example, when the switch or the like is operated to generate the selection input
signal, a signal for designating a position is applied from the position command means to the
control means, and the control means receives the signal and receives the actuator. Driving is
performed, and the movable portion of the sound intervention mechanism is positioned at the
commanded position. (Embodiment) FIG. 1 shows a main configuration of a vehicle acoustic
device according to one embodiment of the present invention. In the figure, 2 is a speaker
attached to the rear tray 1 facing upward, and although only one is shown in the figure, right and
left two-channel speakers are attached to the rear tray 1, and the sound described below is
attached to each speaker 2 A diffractive mechanism is attached. 3 is a fixed reflector, and the
mounting of the speaker 2 is fixed to the rear tray l with a screw or the like at a position slightly
behind the position, is installed inclined to the front band, and functions to diffract the radiation
sound from the speaker 2 to the front Play. A movable reflector 4 is attached to a side end of the
fixed reflector 3 via a hinge shaft 5 as shown by an arrow. The movable reflector 4 also has the
function of diffracting the radiation sound from the speaker 2, but the direction of diffraction of
the radiation sound changes depending on the rotational position of the movable reflector 4.
That is, by changing the angle of the movable reflector 4, it is possible to change the substantial
directivity characteristic of the radiation sound from the speaker 2. The hinge shaft 5 is
interlockingly connected to the motor 6 as the actuator via a reduction gear and the like, and the
movable reflector 4 is driven and rotationally displaced via the hinge shaft 5 by the rotation of
the motor 6 . The motor 6 is provided with a position detector 7 such as a contact mechanism for
position detection or a rotary encoder. The servo control unit 8 controls the rotation of the motor
6 using the output signal of the position detector 7 as a position feedback signal to position the
movable reflector 4 at an arbitrary position. The position command unit 9 gives a command
signal of the target position of the movable reflector 4 to the servo control unit 8. A combination
pattern of a plurality of types of positions is preset in the position command unit 9 for the
movable reflectors of the acoustic diffraction mechanism of the left and right channels. In other
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words, the position of the movable reflector 4 for one driver, the position of the front seat lifter,
the position of the reflector for the second row seat, the position of the third row seat for the
passenger, or the localization of the sharp sound field There are presets such as the nori flea
position and the nori flea position for sound field reproduction in a soft mood.
When one of these preset and flexible positions is selected by the selection switch 10, the
corresponding target position signal is input from the position command unit 9 to the servo
control unit 8, and the servo control unit 8 causes the movable reflector 4 to coincide with the
target position. To servo control the motor 6. Next, the configuration of the second embodiment
of the present invention will be described. In the above embodiment, the selection switch 1o is
preset to manually select the position of the flexure. In the second embodiment, for example, in a
3-row seat p vehicle having a capacity of 7 people, a detector is provided to detect whether or
not a person is seated at the seating position of each seat. And detect the seating position. Then,
the number of occupants in the vehicle compartment and the seating position are divided in
advance into several patterns, and the pattern classification information is configured to act on
the position command unit 9 in the same manner as the selection switch 10. That is, the target
position of the reflector is automatically determined according to the pattern of the number of
occupants in the vehicle compartment and the seating position, the target position is input from
the position command unit 9 to the servo control unit 8, and the movable reflector 4 is set to that
position. It is positioned. In this way, the occupant is automatically adjusted to the position of the
flapper according to the number of occupants and the seating position without being aware of
the adjustment operation of the movable reflector 4 at all. For example, in the case of only the
front seat occupant, the angle between the fixed reflector 3 and the front side of the movable
reflector 4 is reduced. As a result, the sound is diffused uniformly only in the front seat left and
right occupant direction, and the propagation to the door glass etc. is reduced, and the extra
interference due to the glass reflection is eliminated. The front seat occupant can perform sound
image localization with a sense of stereo because the main sound path lengths of the left and
right speakers are substantially equal. Also, if there is a passenger in the rear seat, increase the
angle between the front sides of both reflectors. Then, the right speaker diffuses the sound to the
left and the left speaker to the right, so that the noise of the rear occupant due to the direct
sound from the speaker is reduced, and the left and right sound levels become almost equal.
(Effects of the Invention) As described above in detail, according to the present invention, the
characteristics of the sound field in a narrow space in a car are adjusted by changing the
directivity characteristics of the sound emitted from the speaker, and the number of occupants is
increased. Optimal directional characteristics can be obtained in accordance with the sitting
position or the character of the music to be listened to. Moreover, the operation is extremely
simple since the acoustic diffraction mechanism for changing the directivity is remotely
controlled.
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In addition, it is possible to easily perform appropriate adjustment by presetting several
combinations of positions of the acoustic diffraction mechanisms for the left and right speakers
and selecting the combinations.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram of a main part of a vehicle acoustic device according to an embodiment
of the present invention.
1 ......... rear shelf 3 ...... fixed reflector 5 ...... hinge shaft 7 ...... position detector 9 ...... position
command section 2 ...
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