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JP2003037897

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2003037897
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker system system.
[0002]
2. Description of the Related Art In order to reproduce a stereo signal, a speaker for the L
channel and a speaker for the R channel are usually placed at the required distance apart in front
of the listener, and the two speakers and the listener are heard. It is ideal that the line connecting
the people is an equilateral triangle. On the other hand, U.S. Pat. No. 6,069,962 proposes a
speaker device in which a plurality of speakers are provided in a single housing, and these
speakers reproduce stereo images.
[0003]
FIG. 7 is a plan view of such a loudspeaker apparatus, wherein a center speaker unit 301 for
reproducing L + R components on the front, a speaker unit 302 for L channel for reproducing LR components on the left, and R-L components on the right A speaker unit 303 for R channel to
be reproduced is provided. The L channel and R channel speaker units 302 and 303 are disposed
at an angle of 45 degrees toward the listener. Also, reflecting walls 304 and 305 are provided at
an angle of 90 degrees with the L channel and R channel speaker units 302 and 303,
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respectively.
[0004]
Therefore, the synthetic sound of the reproduced sound from the L channel speaker unit 302 and
the reproduced sound reflected by the reflecting wall 304 is in the direction of the arrow A
which is the front from the virtual point 306 and in the direction of the arrow B of 90 degrees.
The synthetic sound of the reproduced sound of the R channel speaker unit 303 and the
reproduced sound reflected by the reflecting wall 305 is emitted in the arrow C direction
opposite to the arrow B direction.
[0005]
The reflective wall 104 is provided for the radiation sound from the first speaker unit 302
disposed at an angle of 45 degrees to the direction of arrow B to be directed in the direction of
arrow B. It is done.
Of course, the reflective wall 305 is similarly configured. With this configuration, a stereo image
can be sufficiently obtained even if the distance between the speaker units 302 and 303 is short.
[0006]
SUMMARY OF THE INVENTION According to the above-described speaker apparatus 300, it is
possible to reproduce a wide stereo image while arranging a speaker unit in one enclosure, but
physically Since the distance between the L channel speaker unit 302 and the R channel speaker
unit 303 is narrow, it can be obtained.
[0007]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present
invention is arranged in such a direction as to reflect at a predetermined angle toward a wall
located in front of a listener, and to make the L channel signal A speaker unit for L channel
reproduction, an R channel speaker unit for reproducing an R channel signal disposed in a
direction to be reflected at a predetermined angle toward a wall located in front of a listener, a
speaker unit for L channel, And an enclosure incorporating the speaker unit for R channel.
[0008]
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be
described in detail below based on the embodiments shown in the drawings.
Dolby Digital, which is one of the multi-channel surround systems, uses six front channels
including L channels, R channels and center channels, two rear channels including rear L
channels and rear R channels, and one subwoofer. It is necessary to prepare a speaker.
[0009]
On the front side, an enclosure 200 shown in FIGS. 1 and 2 is used.
FIG. 1 is a plan view of the enclosure 200, and FIG. 2 is a right side view thereof. A center
speaker unit 201 for reproducing the L + R component is provided on the front, and an L channel
speaker unit for reproducing the L-R component on the left. 202 are arranged in the opposite
direction to the center speaker unit 201. On the right side, the R channel speaker unit 203 for
reproducing the R-L component is similarly directed to the center speaker unit 201 in the
opposite direction. This is because the wall 10 is designed on the back of the enclosure 200 so
that the reproduced sound from the speaker units 202 and 203 radiates toward the wall 10 at an
angle of about 45 degrees. It is arranged. Therefore, the speaker units 202 and 203 are arranged
such that their vibration axes are at an angle of about 90 degrees.
[0010]
As a result, the speaker unit 202 is at the reflection point 11 where the reproduced sound from
the speaker unit 202 is reflected by the wall 10 and the speaker unit 202 is at the reflection
point 12 where the reproduced sound from the speaker unit 203 is reflected by the wall 10 203
will be located virtually. Therefore, although the speaker units 202 and 203 are compactly
arranged in one enclosure 200, it is reproduced as it is virtually the same as expanding the
distance between the speaker units 202 and 203. It is possible to expand the stereo image.
[0011]
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Also, the mounting height of the center speaker unit 201 is arranged to be different with respect
to the L channel speaker unit 202 and the R channel speaker unit 203. As a result, since the
speaker unit 201 for reproducing the positive phase component and the generation source of the
reproduced sound from the speaker units 202 and 203 for reproducing the negative phase
component are clearly different in the height direction, the localization of the reproduced sound
is I found that the feeling improved. Particularly, as shown in FIG. 4, it is possible to obtain a
preferable result from the viewpoint of sound quality by making the center speaker unit 201
high.
[0012]
The rear side enclosure 100 is shown in FIG. 3, which is a plan view thereof, and in FIG. 4, which
is a front view thereof. In the front of the enclosure 100, a center speaker unit 101 for
reproducing the sum component of the rear L channel and rear R channel, an L channel speaker
unit 102 for reproducing the LR component obtained by subtracting the rear R channel from the
rear L channel, rear R A rear R channel speaker unit 103 is provided for reproducing the R-L
component obtained by subtracting the rear L channel from the channel.
[0013]
The L channel and R channel speaker units 102 and 103 face the center speaker unit 101 at an
angle of about 50 degrees. Further, similarly to the enclosure 200 on the front side, the heights
of the L channel and R channel speaker units 102 and 103 are arranged to be different from the
speaker unit 101, which contributes to an improvement in the sense of localization of
reproduced sound.
[0014]
FIG. 5 is a plan view showing a state in which the enclosure 200 is installed forward of the
listener 13 and the enclosure 100 is installed backward. The DVD player 20 and the AV amplifier
21 are connected by an optical cable, and when the DVD is loaded on the DVD player 20, a 5.1
channel audio signal before being decoded and a video signal is input to the AV amplifier 21. The
AV amplifier 21 decodes the audio signal from the DVD player 20 and converts it into an audio
signal of 5.1 channel, and then outputs it to the signal processing device 30. On the other hand,
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when a CD is loaded on the DVD player 20, audio signals of two channels are output to the AV
amplifier 21.
[0015]
The signal processing unit 30 is connected to the front enclosure 200 and the subwoofer 204 by
cables 22 and 23, and is connected to the rear enclosure 100 by infrared rays. Therefore, by
connecting the signal processing device 30 and the enclosure 200 with a 6-core cable, it is
possible to connect the signal processing device 30 and the speaker device 200 on the tent side
with a single cable. Further, since the rear enclosure 100 is connected by infrared rays, no cable
exists. Therefore, compared to the case where speakers are installed at the corners of a room, the
number of speaker cables is significantly reduced, and the appearance of the room is not
impaired. Further, a 5.1 channel system can be constructed by the front side enclosure 200, the
rear side enclosure 100 and the subwoofer 204, so the number of speakers can be reduced.
[0016]
FIG. 6 is a block diagram of the signal processing unit 30. As shown in FIG. An L channel signal in
a stereo output signal of a CD player, a tuner or the like is input to an L-in terminal 31, and an R
channel signal is input to an R-in terminal 32. These two signals are added by the adding circuit
40 to be an L + R signal, pass through the adding circuit 41 and pass through the low pass filter
(hereinafter referred to as LPF) 42 to remove high frequency components of about 2 KHz or
more, and then for gain adjustment The signal is input to the amplifier 62 via the variable
resistor 43 and reproduced from the center speaker 201.
[0017]
Further, by passing through the LPF 44, a low frequency signal of about 150 Hz or less of the L +
R signal is amplified by the amplifier 64 through the adder circuit 45 and then reproduced by the
subwoofer 204.
[0018]
The L channel signal input to the L-in terminal 31 is converted into an L-R signal by subtracting
the R channel signal whose level is adjusted by the variable resistor 46 by the subtractor 47, and
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then the amplifier 61 It is amplified and reproduced by the L channel speaker 202.
Similarly, the R channel signal input to the R-in terminal 32 is converted to an R-L signal by
subtracting the L channel signal whose level is adjusted by the variable resistor 48 by the
subtractor 49, and then the amplifier 63 , And reproduced by the R channel speaker 203.
[0019]
Therefore, the L-R signal is reproduced by the speaker 202, the low and middle frequency
components of the L + R signal are reproduced by the speaker 201, the R-L signal is reproduced
by the speaker 203, and the low frequency component of the L + R signal is reproduced by the
subwoofer 204. Ru. With the above signal processing, a negative R channel signal for the L
channel signal and a negative L channel signal for the R channel signal are added, so that the
sound field is wide enough even if the speaker spacing is narrow. Space can be reproduced.
[0020]
Since high frequency components have a large effect on the localization of the sound image, the
LPF 42 prevents the high frequency components of the L + R signal from being output from the
center speaker 201.
[0021]
Further, by arranging the enclosure 200 close to the wall 10, the L-R and R-L signals are once
reflected by the wall 10 and then directed to the listener, as shown by the arrows in FIG. It is
possible to diffuse the sound image in a wider range, and to reproduce a wider stereo image.
[0022]
Although the above description is the circuit operation in the case of reproducing a 2-channel
audio signal, the present apparatus can also input a 5.1 digital signal of Dolby Digital.
In this case, the output signal of the AV amplifier 71 is added to the L-in terminal 31 and the R-in
terminal 32 described above, the center channel signal on the front side is on the C-in terminal
33, and the L channel signal on the rear side is RL-in. A rear side R channel signal is input to the
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terminal 34, a subwoofer signal is input to the sub-in terminal 36 to the RR-in terminal 35.
[0023]
The C-in terminal 33 is connected to the adder 41 so that the center channel signal of the Dolby
digital signal is added to the aforementioned L + R signal, and after the high frequency
component is removed by the LPF 42, the center speaker unit 201 Played from.
On the other hand, the rear L channel signal, rear R channel signal, and subwoofer signal are
added by connecting the C-in terminal 33, the RL-in terminal 34, the RR-in terminal 35, and the
Sub-in terminal 36 to the adding circuit 50. Be done. The low frequency signal of about 150 Hz
or less in this added signal is extracted by the LPF 51 and added to the low frequency signal of
the front L channel signal and the front R channel signal by the addition circuit 45, and then via
the variable resistor 55 for gain adjustment. It is connected to the amplifier 64.
[0024]
Therefore, since the subwoofer 204 reproduces not only the signal input to the subwoofer input
terminal 35 but also the low frequency components included in all channels, the aperture of the
speaker unit used for the speaker device 100 200 is small. Since the low frequency components
that can not be reproduced can be reproduced by the subwoofer 204, the bass that affects the
realism is not impaired. Since human beings can not identify the directionality of the bass
component, it can not be recognized that bass is being reproduced from the left on the rear side
even when the bass component is included only in the rear L channel, for example. Therefore,
even if the bass which should be reproduced from the left side of the rear is reproduced from the
subwoofer, no sense of discomfort is generated.
[0025]
The rear L channel signal and rear R channel signal input to the RL-in terminal 33 and RR-in
terminal 34 are converted into serial signals by the signal conversion circuit 52 and then output
from the light emitting device 53 as infrared light . A light receiving device 80 provided in the
rear speaker device 100 receives the infrared light and demodulates it into a two-channel signal
by the signal conversion circuit 81. The demodulated rear L channel signal and rear R channel
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signal are respectively added by the adder 82, then the high frequency component is removed by
the LPF 83 and amplified by the amplifier 92 through the variable resistor 84 for gain
adjustment, It is reproduced from the center speaker unit 101.
[0026]
Also, after the rear R channel signal is made to have a predetermined level by the variable
resistor 85 for gain adjustment, the L-R signal on the rear channel side is subtracted by being
subtracted from the rear L channel signal by the subtractor 86. It is generated. The L-R signal is
amplified by the amplifier 91 and reproduced by the speaker unit 102. Similarly, the rear L
channel signal is set to a predetermined level by the variable resistor 87 for gain adjustment, and
then subtracted from the rear R channel signal by the subtracter 88, whereby the R-L signal on
the rear channel side is It is generated. The R-L signal is amplified by the amplifier 93 and
reproduced by the speaker unit 103.
[0027]
As in the front side, the L channel speaker 102 reproduces the antiphase component of the R
channel signal, and the R channel speaker 103 reproduces the L channel signal in antiphase
component. Similarly to the above, even if the distance between the speaker units 102 and 103 is
narrow, the sound image can be diffused in a wider range, and a wide stereo image can be
reproduced.
[0028]
Although the center speaker unit 201 is attached to the enclosure 200 in the above embodiment,
the center speaker unit 201 is not essential in the present invention, and the L channel speaker
202 and the R channel speaker unit 203 are provided. Are provided in the enclosure 200, and
each may be configured to emit sound toward the wall 1 as shown in FIG.
[0029]
As described above, according to the present invention, speakers for L channel and R channel are
accommodated in one speaker box, and the distance between the speakers is virtually reduced
even if the distance between them is reduced. Since a large distance can be taken, realistic
reproduction can be achieved.
[0030]
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Brief description of the drawings
[0031]
FIG. 1 A plan view of the front enclosure 200. FIG.
[0032]
Fig. 2 Right side view of the front enclosure 200.
[0033]
FIG. 3 is a plan view of the rear enclosure 100.
[0034]
FIG. 4 is a front view of the rear enclosure 100.
[0035]
FIG. 5 is a plan view showing the enclosures 100 and 200 installed in a room.
[0036]
6 is a block diagram of the signal processing device 30. FIG.
[0037]
7 is a plan view of the conventional speaker 300. FIG.
[0038]
Explanation of sign
[0039]
10 Wall 20 DVD Player 21 AV Amplifier 30 Signal Processing Device 100 Rear Side Enclosure
101 Rear Side Center Speaker Unit 102 Rear Side L Channel Speaker Unit 103 Rear Side R
Channel Speaker Unit 200 Front Side Enclosure 201 Front Side Center Speaker Unit 202 Front
Speaker unit 203 for the left L channel Speaker unit 204 for the front R channel Subwoofer
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