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JP2002369297

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DESCRIPTION JP2002369297
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker device installed in a car.
[0002]
2. Description of the Related Art In U.S. Pat. No. 6,069,962, a speaker apparatus is proposed in
which a plurality of speakers are provided in one housing and these speakers reproduce stereo
images. FIG. 3 is a plan view of such a speaker apparatus 100. A center speaker unit 101 for
reproducing L + R components on the front, a speaker unit 102 for L channel for reproducing LR components on the left, and R-L components on the right An R channel speaker unit 103 is
provided. The L channel and R channel speaker units 102 and 103 are disposed at an angle of 45
degrees toward the listener. Also, reflecting walls 104 and 105 are provided at an angle of 90
degrees with the L channel and R channel speaker units 102 and 103, respectively.
[0003]
Therefore, 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 in the direction of the arrow A
which is the front from the virtual point 106 and in the direction of the arrow B in the direction
of 90 degrees. The synthetic sound of the reproduced sound of the channel speaker unit 103 and
the reproduced sound reflected by the reflecting wall 105 is emitted in the arrow C direction
opposite to the arrow B direction.
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[0004]
The reflective wall 104 is provided for the radiation sound from the first speaker unit 102
disposed at an angle of 45 degrees to the direction of the arrow B to be directed in the direction
of the arrow B, and thus is a material with good reflection efficiency. .
Of course, the reflecting wall 105 is similarly configured. With this configuration, a stereo image
can be sufficiently obtained even if the distance between the speaker units 102 and 103 is short.
[0005]
FIG. 4 is a block diagram of a signal processing circuit applied to the above-described speaker
device 100. As shown in FIG. The L channel signal is input to the L-in terminal 31, and the R
channel signal is input to the R-in terminal 32. The two signals are added by the adding circuit
33, amplified by the amplifier 53 through the low pass filter (hereinafter referred to as LPF) 34,
and reproduced by the subwoofer 104 installed in the rear tray. The L channel signal input to the
L-in terminal 31 passes through a high pass filter (hereinafter referred to as HPF) 35 and is input
to a phase shifter 37 and an LPF 38 for phase shift. Similarly, the R channel signal input to the Rin terminal 32 is input to the phase shifter 39 and the LPF 40 for phase shift through a high pass
filter (hereinafter referred to as HPF) 36.
[0006]
A 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, a signal obtained by subtracting the signal of the LPF 38 from the output of the
phase shifter 39 by the subtraction circuit 42 is amplified by the amplifier 54 and then output to
the speaker unit 103.
[0007]
The outputs of the LPF 38 and the LPF 40 are added by the adding circuit 43, phase-shifted by
the phase shifter 44, amplified by the amplifier 52, and output to the speaker 101.
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[0008]
Therefore, the subwoofer 104 receives an added signal of low-pass signals of L channel and R
channel not subjected to phase processing.
In addition, the center speaker unit 101 receives an addition signal of middle band signals of L
channel and R channel after phase shift. The L channel speaker unit 102 outputs a signal
obtained by subtracting the mid range component of the R channel after phase shift is applied to
the mid range signal of the L channel and higher. Similarly, to the R channel speaker unit 103,
after phase shift is applied to the signal of the middle band or more of the R channel, a signal
obtained by subtracting the component of the middle band of the L channel is output.
[0009]
SUMMARY OF THE INVENTION When the above-mentioned speaker device 100 is disposed at
the center in the width direction of the automobile on the dashboard 10 of the automobile, the
mid-high frequency component is reproduced from the front and the low frequency component
is reproduced from the rear. In general, the low frequency component has no direction in the
human ear, so it does not matter if the subwoofer is placed at any position relative to the listener.
However, regardless of whether the speaker device 100 is mounted on the dashboard of a car or
embedded inside the dashboard, the aperture of the speaker can not but be reduced because of
space efficiency problems, in which case the subwoofer It is necessary to raise the crossover
frequency to about several hundreds Hz.
[0010]
As a result, since the subwoofer reproduces a frequency band in which directionality can be
detected, forward localization is not formed for the listeners who are seated in the driver's seat
and the passenger's seat, and a stereo image with high clarity can not be reproduced. there were.
[0011]
SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is a
signal processing circuit which receives L channel signal and R channel signal and generates L-R
signal, R-L signal and L + R signal. And an L channel speaker for reproducing L-R signals
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disposed on the dashboard of the vehicle, an R channel speaker for reproducing R L signals
disposed on the dashboard of the vehicle, and disposed on the dashboard of the vehicle , And has
a larger aperture than the L channel speaker and the R channel speaker, and a center speaker for
reproducing an L + R signal.
[0012]
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in
detail below based on the embodiments shown in the drawings.
FIG. 1 is a plan view showing the inside of a car.
A center speaker 101 is disposed at the center of the dashboard 10 in the width direction of the
vehicle. Further, the L channel speaker 102 is disposed slightly on the left side from the front of
the passenger seat in the dashboard, and the R channel speaker 103 is similarly disposed on the
dashboard 10 slightly on the right side of the driver's seat. In this embodiment, the center
speaker 101 uses a 6.5-inch speaker, and the L and R channel speakers 102 and 103 use a 3inch speaker.
[0013]
Since the speakers 101 to 103 are distributed on the dashboard 10, it is possible to reproduce a
wide stereo signal of a stereo image as compared with the speaker device 100 shown in FIG.
Although subwoofers that reproduce low-frequency signals are usually placed on the rear tray
behind the rear seat, when the diameter of the speakers 101 to 103 is reduced, the crossover
frequency of the HPF for the speakers 101 to 103 is up to several hundred Hz. You need to raise
it. In this case, the subwoofer also reproduces a midrange in which the human can identify the
directionality of the sound, so the reproduced sound field space is diffused not in the front but in
the rear.
[0014]
Therefore, in the present invention, the center speaker 101 is a speaker with a large aperture,
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and the low frequency component is reproduced by the center speaker 101. With this
configuration, the sound field space is localized in the front of the vehicle over the entire band,
and it is possible to perform reproduction without a sense of discomfort.
[0015]
FIG. 2 is a circuit diagram applied to the above-mentioned speakers 101 to 103. As shown in FIG.
Parts common to FIG. 3 are assigned the same reference numerals. The L channel signal is input
to the L-in terminal 31, and the R channel signal is input to the R-in terminal 32. The L channel
signal input to the L-in terminal 31 passes through the HPF 35 and is then input to the phase
shifter 37 and the LPF 38 for phase shift. Similarly, the R channel signal input to the R-in
terminal 32 passes through the HPF 36 and is then input to the phase shifter 39 and the LPF 40
for phase shift.
[0016]
A 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, a signal obtained by subtracting the signal of the LPF 38 from the output of the
phase shifter 39 by the subtraction circuit 42 is amplified by the amplifier 54 and then output to
the speaker unit 103.
[0017]
The outputs of the LPF 38 and the LPF 40 are added by the adding circuit 43 and the phase is
shifted by the phase shifter 44. Also, after the signals input to the L-in terminal 31 and the R-in
terminal 32 are converted into monaural signals by the adding circuit 33, low-pass signals are
extracted by the LPF 34. The low band signal is added to the signal from the phase shifter 44 by
the adder circuit 45, then amplified by the amplifier 52 and output to the speaker 101.
[0018]
Therefore, the low-pass signals of L channel and R channel are reproduced by the speaker unit
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101 after being made monaural. Further, the addition signal of the middle band signal of L
channel and R channel is input to the speaker unit 101 after phase shift. The L channel speaker
unit 102 outputs a signal obtained by subtracting the mid range component of the R channel
after phase shift is applied to the mid range signal of the L channel and higher. Similarly, to the R
channel speaker unit 103, after phase shift is applied to the signal of the middle band or more of
the R channel, a signal obtained by subtracting the component of the middle band of the L
channel is output.
[0019]
With the above circuit configuration, the L-R signal component is reproduced by the L channel
speaker unit 102, the R-L signal component is reproduced by the R channel speaker unit 103,
and the L + R signal component and the low frequency component are reproduced by the center
speaker unit 101. Ru. Here, since the function of the subwoofer is provided by enlarging the
center speaker 101, it is possible to lay out all the speaker units on the dashboard, and forward
localization in the vehicle compartment can be realized.
[0020]
In the above-described embodiment, the speaker units 101, 102, and 103 are individually laid
out on the dashboard 10. However, as shown in FIG. 3, the speaker units 100, 102, and 103 can
be integrally provided. In this case, the diameter of the center speaker 101 is increased to
provide the function of the subwoofer.
[0021]
Moreover, in the above-mentioned Example, although all the speaker units 101-103 were
arrange ¦ positioned on the dashboard 10, it is not limited to this, The speaker units 101-103 are
arrange ¦ positioned ahead of a driver's seat and a front passenger seat It should just be.
Therefore, the L, R channel speaker units 102 and 103 can be arranged on the back side of the
door mirror, and so on, and so on, and so on.
[0022]
As described above, according to the present invention, forward localization can be formed in an
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automobile, and a reproduced sound with rich presence can be obtained.
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