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JP2009100317

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DESCRIPTION JP2009100317
PROBLEM TO BE SOLVED: If the reproduction sound of a surround channel interferes with the
reproduction sound from a front channel speaker driver, a clear sense of localization can not be
obtained like reflection of a wall or the like. SOLUTION: A first speaker box installed at the lower
side of a television screen, a speaker driver for reproducing a front L channel, a front center
channel and a front R channel, and a speaker for surround L channel and surround R channel A
driver is attached, the second speaker box installed at the top of the television screen, and the
playback signal input to the speaker driver for round L channel and surround R channel are
processed, and the speaker for round L channel and surround R channel And a virtualizer for
localizing the sound source at a place different from the place where the driver is installed.
[Selected figure] Figure 8
Multichannel signal reproduction device
[0001]
The present invention relates to a multi-channel signal reproduction apparatus used when
reproducing a DVD or terrestrial digital broadcast.
[0002]
A so-called home theater system for reproducing multi-channel surround signals such as 5.1
channel or 6.1 channel has prevailed in general homes.
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This system basically reproduces each channel signal by an independent speaker for each
channel. Therefore, in the case of 5.1 channel signal reproduction, it is necessary to arrange
three speakers for front L channel, front center channel and front R channel in front, and two
speakers for surround L channel and surround R channel in rear There is. In addition,
subwoofers are also required in most cases for bass reproduction.
[0003]
On the other hand, the applicant of the present invention processes two surround L channel
signals and surround R channel signals in a virtualizer using a head-related transfer function
(hereinafter referred to as HRTF) in Patent Document 1 and installs two at the front of the
listener. We propose a home theater system that can localize the sound image to the position
where no speaker exists by reproducing from the speaker. According to such a system, it is
possible to construct a home theater system simply by installing one speaker and five
subwoofers equipped with five speaker drivers in front of the listener in a room. Therefore, it is
not necessary to install a large number of speakers in the room, and it is possible to obtain a
simple system that does not lead much wiring in the room. Unexamined-Japanese-Patent No.
2005-102063
[0004]
The system using the virtualizer described above defines the filter constant of the head related
transfer function on the premise that the listener's ear is located at a predetermined position.
Therefore, for example, when the reflected sound from the wall or ceiling of a room reaches the
listener's ear, anything other than the sound calculated by the head-related transfer function
enters the listener's ear, and the sense of localization of the surround channel is impaired. .
[0005]
In addition, the surround L channel signal and the surround R channel signal are emitted from
the speaker driver to space and propagate the air to reach the listener's ear, but as disclosed in
Patent Document 1, the surround L channel signal and the surround are disclosed. When the
speaker driver for the R channel signal and the speaker driver for the front channel are housed in
one speaker box, the speaker driver for the surround L channel signal and the surround R
channel signal and the speaker driver for the front channel are adjacent Therefore, the
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2
reproduction sound emitted from the speaker driver for the surround L channel signal and the
surround R channel signal immediately interferes with the reproduction sound from the front
channel speaker driver. As a result, as in the case where there is a reflection of a wall or the like,
a clear sense of localization can not be obtained.
[0006]
In order to solve the above-mentioned problems, the present invention solves the above
problems by three speaker drivers for reproducing front L channel, front center channel and
front R channel signals, and speakers for front L channel, front center channel and front R
channel. A driver is attached, and a first speaker box 1 installed on the lower side of the
television screen, a speaker driver for reproducing the surround L channel and the surround R
channel, and a speaker driver for the surround L channel and the surround R channel are
attached. , The second speaker box installed at the top of the television screen, and the playback
signal input to the round L channel and surround R channel speaker drivers, and And a
virtualizer that localizes the sound source to a place different from the place where the speaker
driver for the left L channel and the surround R channel is installed.
[0007]
According to the present invention, the reproduction sound of the surround channel subjected to
the fine signal processing reaches the listener without interfering with the reproduction sound of
the front channel, so that the reproduction sound of the surround channel having a clear sense of
localization can be obtained. It can.
[0008]
Hereinafter, the best embodiment according to the present invention will be described with
reference to the attached drawings.
[0009]
Hereinafter, examples of the present invention will be described.
In the device of the present invention, of the 5.1 channel signals, the speaker drivers 3 to 5 for
reproducing the front L, center and front R channels are accommodated in the base speaker box
1.
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1 to 3 are a top view, a front view, and a perspective view of the base speaker box 1, and in order
to form a total of three sealed cavities, the partitions 6, 7 are provided inside the base speaker
box 1. .
A total of 6 core speaker cables for the three speaker drivers 3 to 5 are illustrated as one speaker
cable 8. In addition, on the front of each of the speaker drivers 3 to 5, a salan net 9 of a
breathable cloth is provided so that the speaker drivers 3 to 5 can not be seen directly from the
outside.
[0010]
The vibration axes of the respective speaker drivers 3 to 5 are arranged to face upward
approximately 30 degrees in consideration of the base speaker box 1 being at a position lower
than the height of the listener's ear. Further, the L channel speaker driver 3 and the R channel
speaker driver 5 are disposed to face the outside with respect to the center channel speaker
driver 4. With this outward-directed arrangement, the reproduced sound from the speaker
drivers 3 and 5 is radiated to the space in the opposite direction to each other, so the same effect
as in the case where the speaker drivers 3 and 5 are disposed at large intervals has Contribute to
the enlargement of stereo images.
[0011]
Speaker drivers 11 and 12 for reproducing the surround L and surround R channels are
accommodated in the top speaker box 10. 4 to 6 are a top view, a front view, and a perspective
view of the top speaker box 1, and a partition 13 is provided inside the top speaker box 10 to
form a total of two sealed cavities. A total of four core speaker cables for the two speaker drivers
11 to 12 are illustrated as one speaker cable 14. A cloth saran net 15 is provided on the front of
each of the speaker drivers 11 and 12 in the same manner as described above.
[0012]
FIG. 7 is a circuit block diagram of a home theater system 20 including an amplifier for driving
the above-described speaker drivers 3-5, 11, 12. Digital data from the DVD drive 2 controlled by
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the microcomputer 25 is provided with a mechanical unit such as an optical pickup and a
turntable, various servo circuits, and a data demodulation circuit, and is input to the 5.1 channel
decoder 22, front L, front center, The signals are decoded into front R, surround L, surround R
channel and subwoofer channel signals, respectively. Digital signals of the front L, the front R,
and the front center channel are input to the digital amplifier 23.
[0013]
On the other hand, the surround L and surround R channel signals are input to the virtualizer 24.
For example, the virtualizer 24 has a filter having a filter characteristic that provides an impulse
response so that the reproduced sound can be heard from the rear left side of the listener even if
the surround L channel signal is reproduced by the speaker installed on the front side of the
listener. Various filter characteristics are adjusted on the assumption that the distance between
the speaker box 10 and the listener is about 2 m. In general, this filter coefficient is called a headrelated transfer function (HRTF), and the input signal has position information by performing a
convolution operation process. The configuration of the virtualizer 24 itself is well known in the
art and does not directly relate to the present application, and therefore the detailed description
thereof is omitted.
[0014]
The output of the virtualizer 24 is input to the digital amplifier 23. The surround L and surround
R channel signals are reproduced by two speaker drivers 11 and 12, respectively, and are not
reproduced by one speaker driver for each channel.
[0015]
During playback of a 2-channel source such as a CD, the 5.1 channel decoder 22 outputs an L
channel signal to the terminal outputting the front L channel signal and an R channel signal to
the terminal outputting the front R channel signal. And the low frequency signals contained in
both channels as subwoofer channel signals.
[0016]
A signal of each channel converted to a PWM signal by the digital amplifier 23 passes through a
low pass filter (hereinafter referred to as LPF) 26 to be an analog signal, and is output to each of
the speaker drivers 3 to 5, 11 and 12 and the subwoofer 27. Be done.
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[0017]
FIG. 8 is a view showing a state in which the base speaker box 1 and the top speaker box 10 are
installed indoors.
The television 31 is installed on the television stand 32 so as to face the listener 33.
The base speaker box 1 is installed at the center in the width direction of the television on the
television stand 32. Further, the top speaker box 10 is installed at the center of the upper part of
the television 31 in the width direction of the television. In recent years, televisions have been
thinned such as liquid crystal televisions and plasma televisions, and a mount adapter 40 shown
in FIG. 9 is used to install the top speaker box 10 at the top of the television. Although the
subwoofer 27 is installed on the television stand 32 in the illustrated embodiment, it is difficult
for a human to determine where the low frequency sound comes from, so it is between the
viewing positions. There is no need to install in front.
[0018]
By arranging the base speaker box 1 at the center in the width direction of the television 31, the
voice of the announcer and the speech of the movie in the news program reproduced by the
center channel speaker driver 4 can be localized at the center in the width direction of the
screen. it can.
[0019]
The various filters of the virtualizer 24 are designed such that the distance between the top
speaker box 10 installed on the television 31 and the ears of the listener 33 is 2 m.
Therefore,
[0020]
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FIG. 9 is a side view of the mount adapter 40 attached to the top of the television 31. The mount
adapter 40 comprises a base plate 41 mounted on the top of the television 31 and two arm
portions 42 rotatably provided on the pace plate 41. The arm portion 42 can be fixed to the base
41 by a screw 43 so that the angle can be adjusted. By adjusting the mounting angle according to
the thickness of the television 31, etc., the base plate 41 becomes horizontal to the top of the
television 31 . The top speaker box 10 is placed on the base plate 41, and the top speaker box 10
is fixed to the base plate 41 with a screw (not shown). A surface fastener (not shown) or the like
may be attached to the surface of the base plate 41 in contact with the upper surface of the
television 31, and the base plate 40 may be fixed to the upper surface of the television 31.
[0021]
Since the top speaker box 10 for reproducing the surround channel is arranged at a separate
position separately from the base speaker box 1 for reproducing the front channel, the
reproduction sound of the Saland channel reproduced by the speaker drivers 11 and 12 is the
front channel It is possible to reach the listener's ear without being interfered by the reproduced
sound. As a result, although the reproduction sound image of the Saland channel generated
through various filters using the head related transfer function is reproduced from the side of the
listener behind despite being reproduced from the top speaker box 10 arranged in front of the
listener It becomes possible to do localization clearly.
[0022]
Further, the fact that the top speaker box 10 for reproducing the surround channel is installed on
the television 31 necessarily means that the top speaker box 10 is installed at a certain distance
from the floor. Thereby, if the top speaker box 10 is separated from the wall by about 1.5 m or
more, it is possible to reduce the influence of unnecessary reflected sound from not only the wall
but also the floor, and unnecessary reflected sound from the floor It does not affect the position
information of the surround channel.
[0023]
Further, although the independent speaker driver 4 is provided for the center channel in the
above-described embodiment, the present invention is not limited to this, the base speaker box 1
has two front L channels and two front R channels. It is also possible to provide a speaker driver
and to reproduce the center channel signal by these two speaker drivers.
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[0024]
FIG. 10 is a circuit block of the home theater system 50 in the second embodiment, and the same
reference numerals are given to the members in common with the first embodiment shown in
FIG.
The front L channel signal from the 5.1 channel decoder 22 is connected to one input terminal of
the first adder 28. Also, the front R channel signal from the 5.1 channel decoder 22 is connected
to one input terminal of the second adder 29. The center channel signal is connected to the other
input terminal of the first and second adders 28 and 29, respectively.
[0025]
With this circuit configuration, the center channel signal can be reproduced by the speaker
drivers 3 and 5 together with the front L channel signal and the front R channel signal, and the
base speaker box 1 can be miniaturized.
[0026]
In the case of a CRT-type television instead of a thin-type television, the top speaker box 10 may
be placed on the CRT-type television without using the mount adapter 40 because there is a flat
surface at the top of the television. It is possible.
[0027]
Moreover, although the various filters of the virtualizer 24 were designed as the distance of the
top speaker box 10 and the listener 33 being 2 m in the above-mentioned Example, this
invention is not limited to this, A filter is designed at arbitrary distances It is possible to take
various aspects without departing from the spirit of the present invention, such as possible.
[0028]
The top view of the base speaker box 1. FIG.
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Front view of the base speaker box 1.
FIG. 2 is a perspective view of a base speaker box 1;
A top view of the top speaker box 10. Front view of top speaker box 10. FIG. The perspective
view of the top speaker box 10. FIG. FIG. 2 is a circuit block diagram of a home theater system
20. The figure which shows the state in which the base speaker box 1 and the top speaker box
10 were installed indoors. The side view in the state where mount adapter 40 was attached to the
upper part of television 31. FIG. 7 is a circuit block diagram of a home theater system 20
according to a second embodiment.
Explanation of sign
[0029]
1 Bass Speaker Box 3 Front L Channel Speaker Driver 4 Center Channel Speaker Driver 5 Front L
Channel Speaker Driver 10 Top Speaker Box 11, 12 Surround Channel Speaker Driver 20 Home
Theater System 24 Virtualizer 27 Subwoofer 31 TV 40 mount adapter
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