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JPH03258199

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DESCRIPTION JPH03258199
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker device for stereo reproduction, and more particularly to a speaker device which can
obtain stereo feeling such as sound image localization regardless of the position of the speaker
device. [Prior Art] A conventional speaker apparatus for stereo reproduction is, as is well known,
arranged with a speaker apparatus for the right channel and a speaker apparatus for the left
channel separated from each other and listened at the front center position of both speaker
apparatuses The configuration is generally used. [Problems to be Solved] In the conventional
stereo playback speaker device having such a structure, the level of the playback sound of the
right channel at a position away from the center position, for example, at a position near the
right channel speaker device. As a result, there is a problem to be solved that the left-right
balance collapses for the listener and the stereo effect can not be obtained. Therefore, in the
present invention, two sets of loudspeaker groups in which loudspeakers having directivity are
distributed in a circle or in a circular arc are combined so that the directionality of their
respective directivity main axes becomes opposite, the problems of the above-described
conventional example To solve the problem. [Means for Solving the Problems] The speaker
apparatus for stereo reproduction according to the present invention for extending the abovedescribed object will be described with reference to FIGS. 1 to 4 showing an embodiment of the
present invention. The left speaker group 1 in which a plurality of directional speakers 1 tlb,...
Are distributed along the circumference (a) with their respective directional main axes Lie, Lfb,.
And the right speaker group 2 in which a plurality of directional speakers are distributed along
the circumference (b) with their respective directivity main axes L2t L2b,. A speaker device for
stereo reproduction characterized in that the central axes of circumference (a) and circumference
(b) are made to coincide with each other, and directional speaker 5L for left reproduction and
right reproduction Of the directional speakers 5R of each of the A plurality of loudspeaker pairs
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5 combined back to back so as to form a line are disposed along the circumference (c) with the
respective directivity main axes L5L and L5R aligned with the tangential direction. It is a speaker
apparatus for stereo reproduction. [In the speaker apparatus for stereo reproduction having a
configuration like a cocoon, the speaker apparatus shown in FIG. 1 is viewed from above to make
a schematic view in FIG. The reproduced sound of the speaker 1a facing the front with respect to
the listening position i1d is mainly listened to, and the directional main axes Llb,... Of the
speakers Ib, If, Ic, ld, Ie deviate from the listening position d, It becomes more difficult to hear as
the degree of deviation increases, and it is masked by the reproduced sound of the speaker 1a.
At the position where the listening position is slightly deviated from the above d, for example, d
′ moved clockwise, the speaker h for the left speaker group 1 slightly deviates from the main
axis L11, and the reproduced sound level decreases somewhat. Because the main axis L1 [of the
speaker approaches d ', the synthetic sound of the speaker 11 and the speaker 1 will be heard. At
this time, the other (mainly right) speakers are hardly heard because their main axes are off.
When the listening position further moves to the front of the next speaker If, the same state as
when the speaker h is the front is obtained. Since this relationship does not change as the
listening position moves further around the speaker device or in the opposite direction, the
sound of the left channel can be heard from the left at any position. On the contrary to the above
left channel, the reproduction sound of the speaker 21 facing the front with respect to the
listening position d in the right speaker group 2 is mainly listened to, and the speakers 2b, 2f, 2c,
2d and 2e Each of the directivity main axes L2b, L2L,... Deviates from the listening position d, and
becomes more difficult to hear as the degree of deviation increases, and is masked by the
reproduced sound of the speaker 21. The playback sound will be heard. This relationship is the
same as in the case of the left channel, regardless of the direction in which the listening position
moves around the speaker device, the sound of the right channel can be heard from the right as a
result. The left speaker and the right speaker are separated by approximately the sum of the
radiuses of the circumference (a) and the circumference (b) on the front left and right sides of 11
d, and this is equivalent to a normal stereo feeling. Although the reproduced sound of all the
speakers is listened to in the low frequency band where the directivity is incomplete, such low
band sound is a band which can not obtain a sense of direction even in the original stereo. In the
above embodiment, the left and right speaker devices are separate speaker groups, but in the
figure, the combination of the speaker 11 and the speaker 2c, the speaker 11 and the speaker
2d. The same effect can be obtained by arranging a plurality of speaker pairs combined back to
back so that the directivity main axes of the speakers become straight in opposite directions.
Referring to FIG. 1, to describe in detail the structure in which the speaker group is formed on
the side surface of the cylinder 3 according to the first embodiment of the present invention, lx,
lb,. The directional loudspeakers constituting the group 1 are arranged at six positions on the
circumference (a) set on the side surface of the cylinder 3 with respective directivity main axes
L1. a, Llb, ..., Llf are mounted in a distributed manner, with the counterclockwise tangent of the
circumference (a).
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2a, 2b,..., 2f are directional speakers constituting the right speaker group 2, and at six positions
on the circumference (b) set on the side surface of the cylinder 3, respective directional main
axes L2a , L2b,..., L2f are attached in a dispersed manner so as to match the tangent of the
circumference (b) in the clockwise direction (that is, the direction opposite to the left speaker
group 1). These directional loudspeakers may have any structure, but as long as there is
directivity only in the horizontal direction, a tone zone may be mounted so as to project in the
radial direction of the cylinder. An audio signal of the left channel is applied to the speaker group
1 whose directivity main axis is counterclockwise, and an audio signal of the right channel is
applied to the speaker group 2 whose directivity main axis is clockwise. As a modification of the
first embodiment, audio signals applied to the left speaker group 1 and the right speaker group 2
exclude signals in a frequency band considered to be nondirectional, and the band (mainly low
frequency sound image localization The band that does not contribute to the stereophonic sense)
is reproduced by the woofer 4 (indicated by a dotted line) installed inside the cylinder 3. This
modification is characterized in that the speakers constituting the left and right speaker groups 1
and 2 may be small, and rich bass can be obtained as the whole reproduced sound. 3 and 4 show
the second embodiment in which the left speaker directional speaker 5L and the right speaker
directional speaker 5R are back-to-back so that the respective directional main axes L5L and L5R
are aligned in the opposite direction. A plurality of combined speaker pairs 5 are disposed along
the circumference (c) in such a manner that the respective directivity main axes coincide with the
tangent direction of the assumed circumference (c) as shown in FIG. 4 A speaker device for
stereo reproduction characterized in that In the configuration illustrated in FIG. 3, the speaker
pair 5 has a structure in which the left directional speaker 5L and the right directional speaker
5R are attached back-to-back to the cabinet 51, and the speaker pair is in the air by the rope 5b.
It is arranged in a circle. In this embodiment, a stand may be used instead of a rope and installed
on the floor. In each of the above embodiments, the speaker group or the speaker pair is
arranged on the entire circumference, and a stereo feeling can be obtained in all directions.
However, the speaker group or the speaker pair having a similar structure is a part of the
circumference. That is, even in the configuration arranged in an arc, within the range of the
central angle in which the arc is included, it is possible to obtain stereo feeling based on the same
principle except for both ends of the central angle. include.
As mentioned above, although the speaker apparatus for stereo reproduction | regeneration
which concerns on this invention was explained in full detail based on the example considered to
be representative, the embodiment of the speaker apparatus by this invention is not limited to
the structure of said each Example The present invention can be appropriately modified and
implemented as long as it has the constituent features described in the above-described claims,
exhibits the effects of the present invention, and has the effects described below. [Effects of the
Invention The speaker device for stereo reproduction according to the present invention is
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configured such that the directivity main axis of the left speaker group is directed to the listening
position direction with respect to an arbitrary listening position around the speaker device. In the
right speaker group, the reproduced sound from the right end speaker where the directivity main
axis is directed to the listening position is mainly heard for the right speaker group. Also have the
effect that a normal stereo feeling can be obtained.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a perspective view of an essential part of the first embodiment of the present invention,
FIG. 2 is a schematic view for explaining the operation of the first embodiment, and FIG. 3 is a
perspective view of the speaker pair of the second embodiment. These are schematic diagrams
explaining the arrangement of the speaker pair of 2nd Example.
1 is a left speaker group, 2 is a right speaker group, 3 is a cylinder, 4 is a woofer, and 5 is a
speaker pair.
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