JPH10229599

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DESCRIPTION JPH10229599
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker system, and more particularly to a speaker system capable of obtaining a feeling of
expansion of a sound field with a simple configuration without using an addition / subtraction
circuit or the like.
[0002]
2. Description of the Related Art Conventionally, when reproducing a stereo sound field using
two speakers for the right (Rch) and left (Lch), the left and right signals are added using an adder
/ subtractor in order to gain a sense of sound field expansion. It is appropriately synthesized and
supplied to two speakers.
[0003]
For example, as shown in FIG. 2, the Lch signal is supplied to the positive terminals of the
subtractors 31 and 32 and the adder 33, and the Rch signal is supplied to the negative terminals
of the subtractors 31 and 32 and the adder 33.
Thus, the subtracter 31 produces an L-0.5 × R output, the subtractor 32 produces an R-0.5 × L
output, and the adder 33 produces a 0.5 × (L + R) output. The outputs of the subtractors 31 and
32 and the adder 33 are amplified by the power amplifiers 41, 42 and 43, respectively, and then
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input to the left, right and center speakers 21, 22 and 23 for audio output.
[0004]
As described above, in the conventional speaker system, in order to obtain a sense of sound field
spread, addition and subtraction of Lch signal and Rhc signal with a predetermined distribution
using an adder and a subtractor It is necessary to incorporate a special electric circuit or to
prepare separately, and there is also a need for wiring of a power supply, which not only
complicates the configuration but also causes a cost up.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a speaker system
which can obtain a feeling of expansion of a sound field with a simple configuration without
requiring special circuits such as adders and subtractors.
[0006]
In order to solve the above-mentioned problems, the speaker system according to the present
invention is a speaker system for stereo reproduction using right and left speaker units, wherein
at least two of the left and right speaker units are used. Two voice coils are provided, and are
configured to be supplied with predetermined right and left signals to each of the at least two
voice coils.
[0007]
Here, the winding directions of the at least two voice coils are reversed, the number of turns is
different, or the winding directions are reversed, and the wire diameters are different.
[0008]
A speaker system according to another aspect of the present invention is a speaker system that
performs stereo reproduction using right and left speaker units, wherein the left and right
speaker units are each provided with at least two voice coils, and the at least two voice coils are
provided. A predetermined right side signal and left side signal are supplied to each of the voice
coils, and a center speaker unit is further provided. In this center speaker unit, a signal
proportional to the addition signal of the right side signal and the left side signal is Supplied.
[0009]
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Here, the speaker unit for center is provided with at least two voice coils, is supplied with input
signals of two or more systems, and is dedicated to middle-bass reproduction or bass
reproduction.
Further, the left and right speaker units are dedicated to middle and high-pitched sound
reproduction.
[0010]
More specifically, in the two voice coils of the left and right speaker units, a × L and −b × R on
the left side, c × R and −d × L on the right side, respectively, L is a left signal, R is a right
signal, and a, b, c, d are arbitrary coefficients and have a relationship of a ≧ b, c ≧ d). In the two
voice coils of the speaker unit, L and -R on the left and R and -L on the right are input, and the
ratio of the number of turns of the voice coil is changed to the left. a × L−b × R, c × R−d × L
on the right (where L is a left signal, R is a right signal, a, b, c, d are arbitrary coefficients and a ≧
b, c ≧ preferably have a relationship of 0.7a 好 ま し く b ≧ 0.2a and 0.7c0.7d ≧ 0.2c).
Configured to be equivalent to
[0011]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to the drawings, an
embodiment of a speaker system according to the present invention will be described.
FIG. 1 is a block diagram showing an embodiment of a speaker system according to the present
invention, which is an example in which a center speaker is provided.
[0012]
In the present embodiment, the left speaker, the right speaker, and the center speakers 11, 12,
and 13 are full-range speakers, respectively, and double voice coils 11a, 11b, 12a, 12b, 13a, and
13a that can simultaneously input two systems of inputs. It has 13b.
[0013]
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The Lch signal is input to the voice coil 11a of the speaker 11, and the Rch signal is input to the
voice coil 11b.
Here, the voice coil 11b is wound (wound) in the opposite direction to the voice coil 11a, and the
number of turns of the voice coil 11b is half that of the voice coil 11a so that the Rch signal is
half with respect to the Lch signal. It is configured.
Thus, an L-0.5 × R signal is input to the L-side speaker 11.
[0014]
Similarly, the Lch signal is input to the voice coil 12a of the speaker 12, and the Rch signal is
input to the voice coil 12b.
Here, the voice coil 12b is wound (wound) in the opposite direction to the voice coil 12a, and the
number of turns of the voice coil 12b is half that of the voice coil 12a so that the Rch signal is
half with respect to the Lch signal. It is configured.
Thus, the R-0.5 × L signal is input to the R-side speaker 12.
[0015]
As described above, in the two voice coils of the left and right speaker units, signals of a × L and
−b × R are input to the left voice coil, and c × R and −d × L are input to the right voice coil.
Configured to be.
Here, L is a left signal, R is a right signal, a, b, c and d are arbitrary coefficients and have a
relationship of a ≧ b and ccd.
[0016]
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Also, for the two voice coils of the left and right speaker units, L and -R for the left voice coil and
R and -L for the right voice coil are input, respectively, and the ratio of the number of turns of the
voice coil By changing etc., the left voice coil can be configured to be equivalent to inputting axLbxR signal and the right voice coil can receive a cxR-dxL signal. Here, L is a left signal, R is a right
signal, a, b, c, d are arbitrary coefficients and have a relationship of a ≧ b, c ≧ d, and 0.7a ≧ b
≧ 0.2a, 0.7c It is preferable to have a relationship of d d 0.2 0.2 c.
[0017]
By adopting such a configuration, the sound localized at the center at the L-side and R-side
speakers is at half the level, and the Lch and Rch sounds are enhanced respectively. The L-side
speaker has the opposite phase of the Rch sound. Also, in the R-side speaker, since the anti-phase
components of the Lch sound are mixed together at half the size, the sense of spread and
reverberation are emphasized.
[0018]
At this time, the sound to be localized at the center may be half level, and center localization may
not be obtained well.
Therefore, in the present embodiment, the center speaker 13 is provided to obtain center
localization. That is, similarly to the speakers 11 and 12, the center speaker 13 has a double
voice coil configuration, an Lch signal is input to the voice coil 13a, and an Rch signal is input to
the voice coil 13b. The voice coil 13b is wound in the same direction as the voice coil 13a, and
the number of turns is the same as that of the voice coil 13a so that the Lch signal and the Rch
signal are the same. Here, the number of turns of the voice coils 13a and 13b is half that of the
voice coils 11a and 12a, and a 0.5 × (L + R) signal is input to the center speaker 13.
[0019]
With the configuration as described above, the total of each signal from the speakers 11 to 13 is
(L−0.5 × R) + (R−0.5 × L) + 0.5 × (L + R) = L + R. Center location of the Here, the sum of the
respective signals does not necessarily have to be L + R, and may be set to be in a preferable
state for hearing.
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[0020]
As described above, according to the present invention, it is possible to obtain the sense of
expansion and reverberation of the sound field only by selecting the number of turns and the
direction of the double voice coil of the speaker, and by providing the center speaker, the center
localization is also clarified. can do.
[0021]
In the embodiment shown in FIG. 1, the three speakers 11 to 13 are full range speakers, but the
left and right speakers may be dedicated to medium-high / high-pitched sounds, center speakers
may be dedicated to medium-low tones, or only low-pitched tones.
[0022]
Also, the resistance value can be changed and adjusted by changing the wire diameter as well as
changing the turns ratio of the voice coil.
[0023]
Furthermore, the voice coil can be double-rolled or more lap wound to allow more complex
control.
[0024]
As described above, according to the speaker system of the present invention, it is possible to
construct a system capable of obtaining a sense of expansion and reverberation of the sound
field only on the side of the speaker. Not only is there no need to use it, the configuration is
simple, but it is also effective in terms of cost reduction.
Further, since generation of signals such as L−R and L + R can be performed without using an
electric circuit, high sound quality can be achieved without deterioration of the sound quality.
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