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JP2006129325

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DESCRIPTION JP2006129325
PROBLEM TO BE SOLVED: To enlarge an area where a virtual sound image effect can be
obtained. SOLUTION: Two virtualizers having required filter characteristics for positioning a rear
channel signal input to a listener at a specific position at an arbitrary position, and having
settings different from each other at a specific position, And a speaker driver that simultaneously
reproduces the output of the virtualizer. [Selected figure] Figure 4
Multichannel signal reproduction device
[0001]
The present invention relates to a multi-channel signal reproduction device.
[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.
This system basically reproduces each channel signal by an independent speaker for each
channel. Therefore, in the case of 5.1 channel reproduction, it is necessary to dispose three
speakers for the front L channel, front center channel and front R channel in the front, and two
speakers for the rear L channel and rear R channel at the rear . In addition, subwoofers are also
required in most cases for bass reproduction.
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[0003]
However, arranging a total of six speakers in the room around the listener and wiring each of
these six speakers is extremely difficult and complicated. In recent years, therefore, for example,
Japanese Patent Laid-Open No. 9-37134 has proposed a three-dimensional sound image
technology that uses a head transfer function (HRTF) and stops the sound image behind the
listener only by the speaker installed in front of the listener. There is. This technique adjusts the
filter constant of the head related transfer function on the premise that the listener is located at a
specific position. Therefore, since the sound image can not be localized behind the listener except
at this specific position, the listening area is limited to a very narrow area, and it is basically
limited to one person to enjoy the home theater at the same time .
[0004]
In order to solve the problems described above, the present invention has the required filter
characteristics to allow the rear channel signal input to the listener at a specific position to be
localized at an arbitrary position, and the specific positions have different settings. It consists of
two virtualizers and a speaker driver that simultaneously reproduces the outputs of the two
virtualizers.
[0005]
According to the present invention, since the area in which the virtual sound image effect can be
obtained can be expanded, it becomes possible for a plurality of listeners to simultaneously enjoy
surround sound only with the speakers installed in front.
[0006]
Hereinafter, the best embodiment according to the present invention will be described with
reference to the attached drawings.
[0007]
Hereinafter, a first embodiment of the present invention will be described.
1 to 3 are a front view, a right side view and a top view of a speaker box 1 used in the present
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invention.
Three enclosed enclosures 2, 3, and 4 are integrally provided in the speaker box 1, and the
enclosures 2, 3, and 4 include the front center channel speaker driver 5, the front L channel
speaker driver 6, and the front R. Channel speaker drivers 7 are provided respectively.
The speaker box 1 is arranged such that the front center channel speaker driver 5 faces the
listener. On the other hand, the vibration axes of the front L channel speaker driver 6 and the
front R channel speaker driver 7 are arranged back to back so as to form an angle of 90 degrees
with respect to the vibration axis of the front center channel speaker driver 5 respectively. ing.
[0008]
Therefore, the vibration axes of the front L channel speaker driver 6 and the front R channel
speaker driver 7 are 180 degrees to each other, so the reproduced sound from each of the
speaker drivers 6 and 7 is in space in the opposite direction to each other. It is emitted.
Therefore, this angular arrangement has the same effect as the speaker drivers 6 and 7 arranged
at a large interval. Of course, with this angular arrangement, the vibration axis of the speaker
driver does not face the listener directly, which may cause a problem that particularly the high
frequency characteristics deteriorate, in which case the high frequency attenuated by a wellknown equalizer circuit Can be compensated.
[0009]
Reference numerals 8 and 9 denote partitions for making the enclosures 2, 3 and 4 independent,
respectively. The enclosures 2, 3 and 4 are sealed independently of each other by the partitions 8
and 9 and do not affect each other. .
[0010]
FIG. 4 is a circuit block diagram of a home theater system including an amplifier for driving the
speaker drivers 5 to 7 described above.
Digital data from the DVD drive 10 provided with an optical pickup, a mechanical part such as a
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turntable, various servo circuits, and a data demodulation circuit is input to the 5.1 channel
decoder 11, and the front L, front center, front R, rear L, rear The R channel and subwoofer
channel signals are decoded respectively. The respective digital signals of the front L and front R
channels are input to one input terminal of the adders 12 and 13.
[0011]
On the other hand, the rear L and rear R channel signals are input to the first and second
virtualizers 14 and 15, respectively. For example, the virtualizers 14 and 15 have a filter having a
filter characteristic that provides an impulse response such that the reproduced sound can be
heard from the rear left side of the listener even if the rear L channel signal is reproduced by the
speaker installed on the front side of the listener. It is a thing. In general, this filter coefficient is
called a head-related transfer function (HRTF), and the input signal has position information by
performing a convolution operation process. The configuration of the virtualizer itself is well
known in the art and is not directly involved in the present application, so the details will be
omitted.
[0012]
The filter coefficients of the virtualizers 14 and 15 are not identical, and as shown in FIG. 9, the
virtualizer 14 has left and right rear channel signals when the listener 50 is located at the
position P1 which is the left side of the normal listening position where it is actually located.
Various filter coefficients including the HRTF function are defined so that the image is localized
at a position 110 degrees left and right from the front of the listener. Similarly, the virtualizer 15
determines the filter coefficients so that the left and right rear channel signals are localized 110
degrees left and right from the front of the listener when the listener 50 is positioned at the
position P2 which is the right side of the normal listening position. ing.
[0013]
The outputs of the virtualizers 14 and 15 are input to the other input terminal of the adder 12,
whereby the front L channel signal and the outputs of the virtualizers 14 and 15 are added by
the adder 12, and this added signal is added to the digital amplifier 16. Is input to Similarly, the
front R channel signal and the outputs of the virtualizers 14 and 15 are added by the adder 13,
and this added signal is input to the digital amplifier 16. On the other hand, the front center
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channel signal is input to the digital amplifier 16 without being subjected to special signal
processing.
[0014]
During reproduction of a CD, the 5.1 channel decoder 11 outputs an L channel signal to a
terminal that has output a front L channel signal and outputs an R channel signal to a terminal
that has output a front R channel signal.
[0015]
The outputs of the adders 12 and 13 digitally amplified by the digital amplifier 16 are input to a
low pass filter (hereinafter referred to as LPF) 17 to be converted into an analog signal, and then
the L channel speaker driver 6 and R channel Are respectively input to the speaker drivers 7.
The front center channel signal is also digitally amplified by the digital amplifier 16 and input to
the LPF 17 to be converted into an analog signal and then input to the front center channel
speaker driver 5.
[0016]
The 5.1 channel decoder outputs a subwoofer output signal. This signal is also digitally amplified
by the digital amplifier 16 and converted to an analog signal by the LPF 17 to drive the
subwoofer 25. The DVD drive 10 and the 5.1 channel decoder 11 are controlled by the
microcomputer 18.
[0017]
With the above configuration, the L channel signal is output from the L channel speaker driver 6
and the R channel signal is output from the R channel speaker driver 7 when the 5.1 channel
signal is reproduced, and the radiation direction is 180 degrees. Stereo images are played back.
Further, the front center channel speaker driver 5 outputs center channel signals such as serifs
to be localized at the center.
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[0018]
Also, as shown in FIG. 9, the rear channel signal is subjected to signal processing by two
virtualizers 14 and 15 different in position respectively assuming that the listener is located, for
L channel speaker driver 6 and R channel It is outputted from the speaker driver 7.
[0019]
With these two outputs, on both sides of the listener 50, two listening positions in which the
filter characteristics are matched to sandwich the listener 50 are constructed in parallel.
As a result, even if the listening area originally limited to one place extends in the lateral
direction, and a plurality of listeners are simultaneously located side by side, the rear channel
signal becomes clear at the rear position where no speaker exists in the listeners of each
different position. It turned out as a result of an experiment of applicants that it orientates to.
[0020]
In the above embodiment, the rear L channel signal and the rear R channel signal output from
the virtualizers 14 and 15 are output from the speaker driver 6 for L channel and the virtualizers
14 and 15 together with the front L channel signal. The rear L channel signal and the rear R
channel signal are output from the R channel speaker driver 7 together with the front R channel
signal. Therefore, as a result of the two types of signals being applied to each of the speaker
drivers 6, 7, there is a disadvantage that one signal modulates the other signal. The second
embodiment described below is capable of solving this drawback.
[0021]
5 to 7 are a front view, a right side view and a top view of the speaker box 31 used in the second
embodiment. The speaker box 31 is integrally provided with five sealed enclosures 32 to 36. The
center channel speaker driver 37 is provided in the enclosure 32 so as to face the listener. On the
other hand, the enclosures 33 and 34 are back-to-back with each other so that the vibration axes
of the front L channel speaker driver 38 and the R channel speaker driver 39 are at an angle of
90 degrees to the left and right with respect to the vibration axis of the center channel speaker
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driver 37. Provided in Therefore, the vibration axes of the front L channel speaker driver 38 and
the front R channel speaker driver 39 are at an angle of 180 degrees to each other, so the
reproduced sound from the speaker drivers 38 and 39 is in space in the opposite direction to
each other. It is emitted.
[0022]
The first and second virtualizer speakers 40 and 41 for reproducing the rear L channel signal
and the rear R channel signal are 30 for the front L channel speaker driver 38 and the front R
channel speaker driver 39 respectively. It is provided in the enclosures 35 and 36 in a state of
being directed to the listener side.
[0023]
Reference numerals 42 to 45 denote partition walls for separating the enclosures 2, 3 and 4, and
the enclosures 32 to 36 have independent sealed structures by the partition walls 42 to 45 and
are not influenced by each other.
[0024]
FIG. 8 is a circuit block diagram of a home theater system including an amplifier for driving the
above-described speaker drivers 37 to 41. The same components as those in the first
embodiment shown in FIG. The explanation is omitted.
[0025]
The outputs of the virtualizers 14 and 15 are added by the adders 20 and 21, amplified by the
digital amplifiers 26 and 27, and then input to the first and second virtualizer speaker drivers 40
and 41.
Therefore, the outputs of the virtualizers 14 and 15 can be output from the virtualizer speaker
drivers 40 and 41 without unnecessary modulation by being output separately from other
signals.
This makes it possible to reproduce a clearer rear channel signal as compared to the first
embodiment.
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[0026]
The present invention is not limited to the above-described embodiment, and can take various
aspects within the scope of the present invention.
[0027]
FIG. 2 is a front view of the speaker box 1;
FIG. 2 is a left side view of the speaker box 1;
FIG. 2 is a top view of the speaker box 1; The circuit block diagram in a 1st Example. The front
view of the speaker box 31. FIG. The left view of the speaker box 31. FIG. The top view of the
speaker box 31. FIG. The circuit block diagram in a 2nd Example.
Explanation of sign
[0028]
1, 31 speaker box 5-7, 37-41 speaker driver 11 5.1 channel decoder 14, 15 virtualizer 16 digital
amplifier 18 microcomputer 19 subwoofer
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