JP2004168267A - On-vehicle speaker device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an on-vehicle speaker device using a flat panel speaker with specially wide directivity as an auxiliary speaker for acoustic correction of a door speaker. <P>SOLUTION: This on-vehicle speaker device includes the door speakers arranged on vehicle left and right door parts and the flat panel speaker with wide directivity arranged in a rear area of vehicle compartment ceiling part for correcting acoustic characteristics of the door speakers. The flat panel speaker is arranged in a corner side of the ceiling part. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a speaker device, and more particularly to an in-vehicle speaker device using a thin speaker having a wide directivity (hereinafter, referred to as a “flat panel speaker”) as an auxiliary speaker for acoustic correction of a door speaker.
[0002]
[Prior art]
FIG. 1 shows a configuration example of a conventional on-vehicle speaker device.
FIGS. 1A and 1B both show examples in which door speakers 3 are embedded inside left and right front doors sandwiching a driver 2. Here, FIG. 1 (a) shows an example in which a cone type box speaker 4 is further arranged on the rear ceiling portion of the vehicle 1 facing forward, and FIG. 1 (b) shows a cone type box speaker on the rear ceiling portion. An example in which the speakers 4 are arranged downward is shown.
[0003]
Most of the installation locations of the vehicle door speakers 3 are located below the listening position of the driver 2, so that the occupant (listener) including the driver 2 has a low sound field and sound image position. Therefore, with the above configuration, the synthesized sound obtained by vector-synthesizing the sound from below by the door speaker 3 and the sound from above by the ceiling box speaker 4 is localized near the listening position of the driver 2.
[0004]
The in-vehicle speaker device is configured such that the plurality of speakers 3 and 4 are appropriately arranged in the limited arrangement space in the vehicle cabin, so that undesired acoustic phenomena that may occur when one speaker reproduces the entire band. And a realistic sound field is created in the vehicle interior (see, for example, Patent Document 1). In addition, there is an example in which a ceiling in a vehicle compartment is used as a speaker (for example, see Patent Document 2).
[0005]
[Patent Document 1]
JP-A-7-304397 (see FIGS. 1, 5 and 7)
[Patent Document 2]
Japanese Utility Model Application No. 6-45865 (see FIGS. 1 and 2)
[0006]
[Problems to be solved by the invention]
However, the cone speaker used for the box speaker 4 generally has a narrow directivity, so that even if the box speaker 4 is arranged at any place on the ceiling, a sufficient sound spreading feeling cannot be obtained in a vehicle room having a short reverberation time. There was a problem. In this case, it is conceivable to increase the number of box speakers 4 installed, but this causes another problem such as installation space / cost.
[0007]
In addition, since the left and right door speakers 3 are arranged to face each other, a sound pressure dip is generated in the vehicle cabin in which the sound output in the vicinity of 200 to 400 Hz is canceled out due to the phase interference between the sound outputs. If this is to be corrected by the box speaker 4 on the ceiling, there is a problem that only the sound image near the sound range where the sound pressure dip occurs due to the narrow directivity of the box speaker 4 is pulled backward.
[0008]
Furthermore, when the volume level of the box speaker 4 on the ceiling is raised to raise the sound field and the sound image position of the entire vehicle cabin, the sound field and the sound image position are simultaneously raised due to the narrow directivity of the box speaker 4. There was also a problem that the entire sound field and the sound image position were pulled backward.
[0009]
In view of the above problems, an object of the present invention is to arrange a flat panel speaker having a wide directivity in a place where the acoustic effect is greatest on the ceiling of a vehicle cabin in addition to a door speaker, so that the directivity described above is narrow. An object of the present invention is to solve various problems caused by a speaker, thereby correcting the acoustic characteristics of a door speaker so as to provide a listener with a sound having a sufficient spaciousness.
[0010]
[Means for Solving the Problems]
According to the present invention, a door speaker disposed on the left and right door portions of a vehicle, and a flat panel speaker having a wide directivity disposed in an area behind a ceiling in a vehicle cabin to correct acoustic characteristics of the door speaker. Is provided. The flat panel speaker is disposed at a corner of the rear part of the ceiling.
[0011]
By arranging flat panel speakers having a wide directivity at the corners of the ceiling (for example, at both rear corners), the sound is irregularly reflected by glass, pillars, or the like, and a sound field can be spread. In addition, since it is arranged at a position higher than the listening position, it also contributes to an increase in the sound field.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 2 shows an embodiment of the speaker device according to the present invention.
In FIG. 2, door speakers 3 are embedded inside left and right front doors of the vehicle 1, and flat panel speakers 5 having wide directivity are embedded at both corners behind the ceiling. Also in this example, the synthesized sound of the sound from below by the door speaker 3 and the sound from above by the flat panel speaker 5 is localized near the listening position of the driver 2.
[0013]
FIG. 3 shows an example of the directional characteristics of the cone speaker and the flat panel speaker.
In FIG. 3A, a solid line 11 indicates an actual measured value of the sound pressure level with the front of the cone speaker set to a direction of 0 degree, a dotted line 12 indicates a direction inclined by 30 degrees with respect to the 0 degree direction, and The directions inclined by 60 degrees with respect to the direction of 0 degrees are indicated by alternate long and short dash lines 13. The same applies to the case of the flat panel speaker of FIG.
[0014]
Comparing the two, the difference in directivity in the high range of 2 to 10 KHz is remarkable, and the cone speaker has a narrow directivity in the range of low to mid range, It can be seen that the flat panel speaker has a wide directivity from low to high. In the present embodiment, the wide directivity of the flat panel speaker 5 and the degree of freedom of its installation location are positively utilized.
[0015]
That is, in the embodiment of FIG. 2, the flat panel speaker 5 having a wide directivity is arranged at a corner (for example, both rear corners) of the ceiling, and the sound output from the flat panel speaker 5 is irregularly reflected by a window, a pillar, or the like. It is possible to provide a feeling of spreading (wrapping) of the sound field over the entire range from low to high frequencies.
[0016]
In addition, since such a feeling of the sound field spreading is given, even if the sound pressure dip generated when the door speaker 3 is used is corrected by the flat panel speaker 5 on the ceiling, the sound pressure dip near the sound range where the special sound pressure dip occurs is obtained. Is no longer pulled backwards. Furthermore, even if the volume level of the flat panel speaker 5 on the ceiling is increased, the sound field and the sound image position of the entire vehicle interior are not pulled backward at the same time as the sound field and the sound image position increase in terms of hearing.
[0017]
FIG. 4 shows a measurement example of the arrival direction and level of the speaker sound by the close four-point method.
4A shows an example of a conventional front door speaker 3 and a cone type ceiling box speaker 4, and FIG. 4B shows an example of a front door speaker 3 and a ceiling flat panel speaker 5 according to the present invention. Is shown.
[0018]
Here, four microphones close to each other are installed at measurement points (positions of the driver 2), and the sound volume in the vehicle interior is collected from four directions of front, rear, left and right. The measurement results are plotted on a graph representing the attenuation of 10 dB (10 dB / div) between the concentric circles, using the four directions as two-dimensional coordinate axes. Here, the center of the concentric circle is 0 dB.
[0019]
In the case of the conventional example of FIG. 4A, since the direct sound from the rear by the cone speaker 4 having a narrow directivity is strong, the sound field and the sound image position are pulled backward in terms of hearing. In addition, the sound near the center of the concentric circle is also dominated by the direct sound from the door speaker 3 and the ceiling box speaker 4, resulting in a lack of a sound field.
[0020]
On the other hand, in the embodiment of FIG. 4B, a moderate direct sound and its reflected sound arrive from the rear due to the wide directivity characteristic of the flat panel speaker 5. As a result, the sound near the center of the concentric circle has a circular spread, and the sound field and the sound image position are pulled backward in terms of hearing, so that the sound is compared with the conventional example of FIG. The feeling of expanse of the space is significantly improved.
[0021]
【The invention's effect】
As described above, according to the in-vehicle speaker device of the present invention, the sense of spaciousness of the sound field is remarkably improved, and the localization of the sound image increases without the sound field or the sound image position being pulled backward in terms of hearing, At the same time, the sound pressure dip is also corrected.
[0022]
As a result, it is possible to provide a sound full of natural presence without incurring new costs such as increasing the number of rear speakers installed. Further, since the flat panel speaker is installed on the ceiling, the rear view is not obstructed, so that there is no problem of installation space or an aesthetic problem in the vehicle interior.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration example of a conventional vehicle speaker device.
FIG. 2 is a diagram showing one embodiment of a speaker device according to the present invention.
FIG. 3 is a diagram illustrating an example of directivity characteristics of a cone speaker and a flat panel speaker.
FIG. 4 is a diagram showing a measurement example of a direction and a level of arrival of a loudspeaker sound by a close four point method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Vehicle 2 ... Driver 3 ... Door speaker 4 ... Ceiling box speaker 5 ... Ceiling flat panel speaker

Claims (2)

Door speakers arranged on the left and right doors of the vehicle,
An in-vehicle speaker device, comprising: a flat panel speaker having a wide directivity disposed in an area behind a ceiling in a vehicle cabin in order to correct acoustic characteristics of the door speaker. The in-vehicle speaker device according to claim 1, wherein the flat panel speaker is disposed at a corner of the ceiling.

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