JP2004289342A - Speaker device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a wider stereoscopic image in a car. <P>SOLUTION: The speaker comprises an L-channel speaker unit disposed at the front center of the driver's seat and the passengers' seat of a car, so that its oscillation axis which is anticlockwise turned in the horizontal direction from the car's running direction forward and inclined in the vertical direction at a specified angle to the car's running direction; and another L-channel speaker unit disposed at the front center of the driver's seat and the passengers' seat of the car, so that its oscillation axis is clockwise turned in the horizontal direction from the car's running direction forward and inclined in the vertical direction at a specified angle to the car's running direction of the car. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a speaker device.
[0002]
[Prior art]
Conventionally, an L-channel speaker and an R-channel speaker are installed at a predetermined distance in front of a listener, and a line connecting these two speakers and the listener forms an equilateral triangle, which is an optimum layout in stereo reproduction. It has been. However, in order to lay out the left and right speakers at a predetermined distance, an installation space is required.
[0003]
Thus, for example, according to US Pat. No. 6,169,812, the L-channel speaker unit, the R-channel speaker unit, and the center speaker unit are housed in one box, and the LR signal from the L-channel speaker unit and the R-channel signal from the R-channel speaker are output. There has been proposed a speaker that outputs a −L signal and an L + R signal from a center speaker disposed between the L-channel speaker and the R-channel speaker.
[0004]
[Problems to be solved by the invention]
By this circuit processing, even if three speaker units are arranged in one speaker box, a stereo image longer than the distance between the L / R channel speaker units can be reproduced. However, since an L + R signal is output from the center speaker unit and an LR signal is output from the L channel speaker unit, (L + R) + (LR) = between the center speaker unit and the L channel speaker unit. An area where the L channel signal of 2L is emphasized is formed, and an unnatural stereo image is formed in this area, so that there is a disadvantage that the listening point is narrow.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention is arranged between an L-channel speaker unit for reproducing an L-channel signal, an R-channel speaker unit for reproducing an R-channel signal, and an L-channel speaker unit and an R-channel speaker unit. , A center speaker unit for reproducing the -L channel signal and the -R channel signal.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 is a plan view showing the inside of an automobile. A center speaker unit 11, an L-channel speaker unit 12, and an R-channel speaker unit 13 are arranged at the center of the dashboard 2 in the width direction of the vehicle. FIG. 2 is a plan view of the speaker units 11 to 13, and FIG. 3 is a cross-sectional view taken along line AA of the center speaker unit 11 in FIG. 4 will be described with reference to FIG.
The vibration axis of the center speaker unit 11 is parallel to the traveling direction of the vehicle in the horizontal direction, and is inclined at 25 degrees to the rear side of the vehicle in the vertical direction. The line is arranged to intersect the windshield 3 of the vehicle. Further, the R-channel speaker unit 13 is inclined forward by 48 degrees clockwise in the horizontal direction and 65 degrees in the vertical direction toward the traveling direction of the vehicle. Although not shown, the L-channel speaker unit 12 is inclined at an angle of 48 degrees counterclockwise in the horizontal direction toward the traveling direction of the vehicle, and 65 degrees in the vertical direction like the R-channel speaker unit 13 in the forward direction of the vehicle. are doing. Note that the speaker units 11 to 13 are attached to closed enclosures 14 to 16, respectively. In this embodiment, a subwoofer 17 is provided below the glove box.
With the arrangement of the speaker units 11 to 13 described above, the reproduced sound from the L-channel speaker unit 12 is radiated at an angle of about 48 degrees in the horizontal direction with respect to the windshield 3, and is reflected by the windshield 3. The reflected sound continues to be reflected by the side glass (not shown) on the passenger seat 3 side, and then emitted toward the listener sitting on the passenger seat 3 or the driver seat 4 along the arrow shown by the broken line in FIG. Similarly, since the reproduced sound from the R channel speaker unit 13 is emitted at an angle of about 48 degrees in the horizontal direction with respect to the windshield 3, the sound reflected on the windshield 3 continues to be reflected on the side glass (see FIG. (Not shown), and is radiated toward the listener sitting on the front passenger seat 3 or the driver seat 4.
FIG. 5 is a circuit block diagram for driving the above-mentioned speaker units 11 to 14. The L-channel signal input to the L-channel input terminal 21 passes through a high-pass filter (hereinafter, referred to as HPF) 23 having a cutoff frequency of 170 Hz, is amplified by an amplifier 31, and reproduced by the L-channel speaker unit 12. Similarly, the R channel signal input to the R channel input terminal 22 passes through the HPF 24 having a cutoff frequency of 170 Hz, is amplified by the amplifier 32, and is reproduced by the R channel speaker unit 13.
The L-channel signal and the R-channel signal are added by an adder 25, then inverted by an inverter 26 and passed through a band-pass filter (hereinafter referred to as BPF) 27 which outputs a band from 300 Hz to 2 KHz. Thereafter, the signal is amplified by the amplifier 33 and reproduced by the center speaker unit 11. Therefore, the center speaker unit 11 reproduces the mid-range component in the sum signal (-LR signal or ((-L) + (-R)) signal) of the -L signal and the -R signal.
The output of the adder 25 is input to a low-pass filter 28 having a cut-off frequency of 170 Hz, so that a signal of about 150 Hz or less is amplified by an amplifier 34 and then input to the subwoofer 17. With the above circuit configuration, the L-channel signal from the L-channel speaker unit 12 reaches both ears of the listener seated on the driver's seat 4 and the passenger's seat 3, respectively, but the opposite of the L-channel signal reproduced from the center speaker unit 11. The -L signal, which is a phase signal, also reaches the listener's ears, and this -L signal cancels the L channel signal around the right ear more than around the left ear. Therefore, as a result of a level difference occurring near both ears of the listener, the sound image of the L channel is recognized as being on the front left side of the listener.
As shown by the broken line in FIG. 1, since the sound reproduced from the L-channel speaker unit 12 comes from the left side of the listener by being reflected by the windshield 3 and the side glass, the listener can hear the L-channel sound image. It is recognized as being on the front left side of the listener. As a result, as shown in FIG. 1, even when the speaker units 11 to 13 are concentrated on the dashboard 2, it is possible to reproduce a stereo image comparable to a case where the speaker spacing is wide.
Further, the reproduced sound from the center speaker unit 11 is also radiated toward the windshield 3, so that the ratio of the direct sound from the center speaker unit 11 directly to the listener is reduced. Accordingly, the monaural component reproduced by the center speaker unit 11, such as vocals, reaches the listener after being reflected by the windshield 3, so that the sound image is localized above the listener, so that realistic reproduction can be realized. .
The present invention is not limited to the above-described embodiment, but can take various forms. For example, the mounting angles of the center speaker unit 11, the L-channel speaker unit 12, and the R-channel speaker unit 13 in the above-described embodiment need to be appropriately changed according to the position of the dashboard 2 in the depth direction, the inclination angle of the windshield, and the like. There is. Further, the present invention is not limited to automobiles, but can be applied to homes.
[0015]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a speaker device capable of obtaining a stereo image longer than the speaker installation interval.
[Brief description of the drawings]
FIG. 1 is a plan view of the inside of an automobile.
FIG. 2 is a plan view of speaker units 11 to 13. FIG.
FIG. 3 is a sectional view taken along line AA in FIG. 1;
FIG. 4 is a sectional view taken along line BB in FIG. 1;
FIG. 5 is a circuit block diagram.
[Description of Signs] 11 Center speaker unit 12 L channel speaker unit 13 R channel speaker unit 17 Subwoofer

Claims (2)

An L channel speaker unit for reproducing an L channel signal,
An R channel speaker unit for reproducing an R channel signal;
A speaker device, comprising: a center speaker unit that is disposed between the L-channel speaker unit and the R-channel speaker unit and reproduces an -L channel signal and an -R channel signal. The L-channel speaker unit, the R-channel speaker unit and the center speaker unit are arranged at the front center of the driver's seat and the front passenger seat of the vehicle, and the vibration axis of the L-channel speaker unit is counterclockwise in the horizontal direction from the front in the traveling direction of the vehicle. And the vibration axis of the R-channel speaker unit in the horizontal direction is a direction in which the vibration axis is inclined at a predetermined angle in the traveling direction of the vehicle. 2. The speaker device according to claim 1, wherein the direction is a clockwise rotation from the front in the direction, and the vibration axis is a direction inclined at a predetermined angle in the traveling direction of the vehicle in the vertical direction.

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