JP2002345098A - Onboard speaker system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To overcome such a problem that a stereo image cannot be reproduced because one channel component is emphasized. SOLUTION: An onboard speaker system comprises a signal processing circuit that receives L and R channel signals and generates an (L-○) signal, an (R-L) signal and an (L+R) signal, a center speaker that is placed nearly in the middle of a dash board of an automobile in a direction of the width of the automobile and reproduces the (L+R) signal, an L channel speaker that is placed to the left of the dash board of the automobile in the direction of the width of the automobile and reproduces the (L-R) signal, and an R channel speaker that is placed to the right of the dash board of the automobile in the direction of the width of the automobile and reproduces the (R-L) signal.

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. 2 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. 3 is a block diagram of a signal processing circuit applied to the speaker device 100 described above. 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
4, 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. In addition, the L-in terminal 31
The channel signal passes through a high-pass filter (hereinafter referred to as HPF) 35 and a phase shifter 37 and a phase shifter L for phase shift.
Input to PF38. Similarly, the R channel signal input to the R-in terminal 32 is a high-pass filter (hereinafter, referred to as a high-pass filter).
An HPF (referred to as HPF) 36 is input to a phase shifter 39 and a LPF 40 for phase shift.

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. Also, the speaker unit 10
To 1, an added signal of the middle-range signals of the L channel and the R channel is input 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, to the R-channel speaker unit 103, a signal obtained by subtracting the middle-range component of the L-channel after a phase shift is applied to the signal of the middle-range or more of the R-channel.

[0009]

The above-described speaker device 1
00 is disposed at the center of the vehicle dashboard 10 in the width direction of the vehicle. In this case, the speaker device 1 is provided to the listener sitting in the driver's seat and the passenger's seat.
00 becomes an angle of 45 degrees obliquely. As a result, for example, in the driver's seat, L
The combined sound from the + R component and the R channel speaker unit 103 is (L + R) − (RL) = 2R, and if the input signal is only the L component, this sound cannot be heard in the driver's seat. Also, by emphasizing the R component,
There was a drawback that stereo images could not be reproduced.

[0010]

According to the present invention, there is provided 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 center speaker that is disposed substantially at the center of the dashboard of the vehicle in the vehicle width direction and reproduces the L + R signal, and is disposed on the left side of the dashboard of the vehicle in the vehicle width direction and L−
An L-channel speaker that reproduces an R signal and an R-channel speaker that reproduces an RL signal and are arranged on the right side of the dashboard of the vehicle in the vehicle width direction.

[0011]

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.

The circuit block described with reference to FIG. 3 is applied to each speaker. A signal obtained by subtracting the middle-range component of the R channel signal from the L channel signal from the L channel speaker 102 is output from the R channel speaker 103. A signal obtained by subtracting the mid-range component of the L channel signal from the channel signal is output from the center speaker 101.
A sum signal of the middle band component of the channel signal and the middle band component of the R channel signal is reproduced.

Since speakers 101 to 103 are arranged in a distributed manner with respect to speaker device 100 shown in FIG. 2, it is possible to reproduce a stereo signal without a sense of discomfort. The subwoofer 104 is arranged on a rear tray behind the rear seat.

The present invention is not limited to the above-described embodiment, but can take various forms.

[0015]

As described above, according to the present invention, when the loudspeaker device is installed on the dashboard of an automobile, it is possible to obtain a reproduced sound with a sense of realism.

[Brief description of the drawings]

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

FIG. 2 is a plan view of the speaker device 100.

FIG. 3 is a circuit block diagram applied to the speaker device 100.

[Explanation of symbols]

 Reference Signs List 101 Center speaker unit 102 L channel speaker unit 103 R channel speaker unit 104 Subwoofer

Claims (2)

[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 is disposed substantially at the center of the dashboard of the vehicle in the vehicle width direction. A center speaker that reproduces the L + R signal; an L-channel speaker that is disposed on the left side of the dashboard of the vehicle in the vehicle width direction and reproduces the LR signal; An in-vehicle speaker device, comprising: an R channel speaker disposed on the right side for reproducing the RL 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. The L-channel signal and the R-channel signal are mixed with each other. The in-vehicle speaker device according to claim 1, wherein the L + R signal is generated by adding.