JP2002369298A - On-vehicle speaker system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the drawback that a stereo image with high degree of a clarify is not reproduced because forward localization is not formed for a listeners who is sitting at a driver's seat and in a front passenger seat. SOLUTION: The system consists of a signal processing circuit for inputting an L-channel signal and an R-channel signal to generate an L-R signal, an R-L signal and an L+R signal, an L-channel speaker arranged at the front of the driver's seat and at the front passenger seat of an automobile to reproduce an L-R signal, an R-channel speaker arranged on the front of the driver's seat and the front passenger seat of the automobile to reproduce an R-L signal, center speaker arranged at the front of the driver's seat and at the front passenger seat to reproduce an L+R signal, and a sub-woofer provided on the doors of the automobile to reproduce low-band frequency band components.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker device installed in an automobile.

[0002]

2. Description of the Related Art In U.S. Pat. No. 6,069,962,
A speaker device has been proposed in which a plurality of speakers are provided in one housing and a stereo image is reproduced by these speakers. FIG. 3 is a plan view of such a speaker device 100. A center speaker unit 101 for reproducing the L + R component is provided on the front, an L-channel speaker unit 102 for reproducing the LR component is provided on the left, and an RL component is provided on the right. An R channel speaker unit 103 is provided. The L-channel and R-channel speaker units 102 and 103 are arranged at an angle of 45 degrees toward the listener. Also, reflecting walls 104 and 105 are provided at 90 degrees with the L channel and R channel speaker units 102 and 103, respectively.

Accordingly, the synthesized sound of the reproduced sound from the L-channel speaker unit 102 and the reproduced sound reflected by the reflecting wall 104 is represented by an arrow A, which is in front of the virtual point 106.
The synthesized sound of the reproduced sound of the R-channel speaker unit 103 and the reproduced sound reflected by the reflecting wall 105 is radiated in the direction of arrow C opposite to the direction of arrow B. You.

The reflecting wall 104 is provided so that the sound radiated from the first speaker unit 102 disposed at an angle of 45 degrees with respect to the arrow B direction is directed to the arrow B direction. Have been. Of course, the reflection wall 105 has the same configuration. With this configuration, a sufficient stereo image can be obtained even if the distance between the speaker units 102 and 103 is short.

FIG. 2 is a block diagram of a signal processing circuit applied to the above-described speaker device 100. The signal of the L channel is supplied to the L-in terminal 31 and the signal of the R channel is supplied to the R-i terminal.
Input to n terminal 32. These two signals are added to an adder 3
3 and then added to a low-pass filter (hereinafter L
After being amplified by the amplifier 53 via the PF (34), it is reproduced by the subwoofer 104 installed on the rear tray behind the rear seat. The L-channel signal input to the L-in terminal 31 is input to a phase shifter 37 and a LPF 38 for phase shift through a high-pass filter (hereinafter, referred to as HPF) 35. Similarly,
The R channel signal input to the R-in terminal 32 is input to a phase shifter 39 and a LPF 40 for phase shift through a high-pass filter (hereinafter, referred to as HPF) 36.

The signal obtained by subtracting the signal of the LPF 40 from the output of the phase shifter 37 by the subtraction circuit 41 is amplified by the amplifier 51, and then output to the speaker unit 102. Similarly, the LPF 3
8 is subtracted by the subtraction circuit 42, the signal is amplified by the amplifier 54, and then the speaker unit 10
3 is output.

The outputs of the LPFs 38 and 40 are added by an adder circuit 43, the phase of which is shifted by a phase shifter 44, amplified by an amplifier 52, and amplified by a speaker 1.
01 is output.

Accordingly, an addition signal of the low-frequency signals of the L channel and the R channel that has not been subjected to the phase processing is input to the subwoofer 104. Further, an added signal of the L-channel and R-channel middle-range signals is input to the center speaker unit 101 after the phase shift. Further, the L-channel speaker unit 102 outputs a signal obtained by subtracting a middle-range component of the R-channel after applying a phase shift to a signal of the middle-range or more of the L-channel. Similarly, the R channel speaker unit 103 applies a phase shift to the signal in the middle or higher range of the R channel,
A signal obtained by subtracting the middle band component of the channel is output.

[0009]

The above-described speaker device 1
When 00 is arranged at the center of the vehicle dashboard 10 in the width direction of the vehicle, the middle and high frequency components are reproduced from the front, and the low frequency components are reproduced from the rear. Generally, since the low-frequency component has no directivity in the human ear, it is considered that there is no problem in placing the subwoofer at any position with respect to the listener.
However, in both cases where the speaker device 100 is mounted on the dashboard of the car or when the speaker device 100 is embedded inside the dashboard, the diameter of the speaker has to be reduced due to space efficiency problems. It is necessary to increase the crossover frequency to about several hundred Hz.

As a result, the subwoofer reproduces the frequency band in which the directivity can be sensed. However, when the subwoofer is arranged on the rear tray, the frontal position is not formed for the listener sitting in the driver's seat and the passenger's seat. However, there is a disadvantage that a stereo image with high clarity cannot be reproduced.

[0011]

According to the present invention, there is provided a signal processing circuit for inputting an L channel signal and an R channel signal and generating an LR signal, an RL signal and an L + R signal. And an L-channel speaker arranged in front of a driver's seat and a passenger seat of a car for reproducing LR signals, and an R channel arranged in front of a driver's seat and a passenger seat of the car and reproducing RL signals Speaker for
It is arranged in front of the driver's seat and the passenger's seat of the car, and includes a center speaker for reproducing the L + R signal, and a subwoofer provided on the door of the car for reproducing the low frequency component.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below 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 101 is arranged at the center of the dashboard 10 in the width direction of the vehicle. The L-channel speaker 102 is disposed on the dashboard 10 slightly to the left of the front passenger seat, and the R-channel speaker 103 is similarly disposed on the dashboard 10 to the right of the driver seat. In this embodiment, each of the speaker units 101 to 103 uses a 3-inch speaker.

Since the speakers 101 to 103 are dispersedly arranged on the dashboard 10, it is possible to reproduce a stereo signal having a wider stereo image than the speaker device 100 shown in FIG. The subwoofer that reproduces the low-frequency signal is usually arranged on the rear tray behind the rear seat. Need to be raised to In this case, the subwoofer also reproduces the midrange in which the directionality of sound can be identified by a human, and thus the reproduced stereo image is diffused not in the front but in the rear direction.

Accordingly, in the present invention, the subwoofer 1
04 is a large-diameter speaker, which is mounted on the door 71 of the driver's seat. With this configuration, since the reproduced sound reproduced from the subwoofer 104 is reproduced at least from the side of the driver and the passenger sitting in the passenger seat, the stereo image is localized in the front of the vehicle in all the bands, and the reproduction without uncomfortable feeling is performed. Becomes possible.

Further, by using a door-mounted speaker as a subwoofer, when a vehicle is equipped with a door-mounted speaker in advance, the speaker units 101 to 103 can be added to the front side only by adding speaker units 101 to 103 on the front side. Construction becomes possible. Further, the door 72 on the passenger seat 62 side, instead of the door 71 on the driver seat 61 side, may be used as a subwoofer. If the crossover frequency of the subwoofer 104 is sufficiently low, the subwoofer 104 can be mounted on the doors 73 and 74 of the rear seat 63.

In the above-described embodiment, the speaker units 101 to 103 are individually laid out on the dashboard 10, but they may be integrally provided as the speaker device 100 as shown in FIG.

In the above-described embodiment, all the speaker units 101 to 103 are arranged on the dashboard 10. However, the present invention is not limited to this, and the speaker units 101 to 103 are provided in front of the driver's seat and the passenger seat. Should just be arranged. Therefore, various modes can be taken such that the L and R channel speaker units 102 and 103 can be arranged behind the door mirror.

[0018]

As described above, according to the present invention, it is possible to form a frontal position in an automobile, and to obtain a realistically reproduced sound.

[Brief description of the drawings]

FIG. 1 is a plan view of the inside of an automobile.

FIG. 2 is a circuit block diagram applied to the device of the present invention.

FIG. 3 is a plan view of a speaker device 100 according to the related art.

[Explanation of symbols]

 Reference Signs List 10 dashboard 61 driver's seat 62 passenger seat 101 center speaker unit 102 speaker unit for L channel 103 speaker unit for R channel 104 subwoofer 111 door

Claims (3)

[Claims] A signal processing circuit for receiving an L channel signal and an R channel signal and generating an LR signal, an RL signal, and an L + R signal; and a signal processing circuit disposed in front of a driver's seat and a passenger seat of the vehicle; An L-channel speaker that reproduces the LR signal; an R-channel speaker that is disposed in front of a driver seat and a passenger seat of the vehicle and reproduces the RL signal; and a driver seat and a passenger seat of the vehicle And a subwoofer disposed at the door of the vehicle and reproducing a low-frequency component, disposed in front of the vehicle and reproducing the L + R signal. 2. The signal processing circuit according to claim 1, further comprising:
A signal is generated, and the L-channel signal is subtracted from the R-channel signal to generate the RL signal, and the L-channel signal and the R-channel signal are added to each other. The in-vehicle speaker device according to claim 1, wherein the L + R signal is generated by using the L + R signal. 3. The in-vehicle speaker device according to claim 1, wherein the sub woofer is provided at a door of the driver's seat or a passenger seat.