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JPS6154794

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DESCRIPTION JPS6154794
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
stereo speaker system in which a speaker system is disposed at each of left and right repositions
so that a sound image can be sensed stereoscopically. [Technical background of the invention
and its problems] As shown in FIG. 6, in the conventional stereo speaker system, the left and
right speaker systems la and lb are disposed facing the front. Is the most common, and each
speaker system la, lb has directivity characteristics represented by three lines. Therefore, the
sound pressure of both speaker systems 1a and 1b for the listening position W2a at the center of
both speaker systems 1a and 1b is represented by 4a and 4b, respectively. Good listening
condition is obtained. However, in the off-center listening position 2b, the sound pressure from
the speaker system la weakens to 4C, and conversely, the sound pressure from the speaker
system 1b increases to 4d, and the distance from the listening position 2b to the speaker system
1b is Since the distance to the speaker system 1a is shorter, most of the sound images are
concentrated on the speaker system 1b and three-dimensional listening can not be performed. As
a method for improving this, as shown in FIG. 7, the speaker unit 5 for high to middle frequency
range with high directivity is inclined to the center direction with respect to the speaker unit 6
for low frequency range having weak directivity, Sometimes it has the directivity characteristic of
SEC type represented by nine lines as shown in Fig.8. In this case, the sound pressures 9a and 9b
in this direction are equal to the listening position 8a at the center of the left and right speaker
systems 7a and 7b, and the distances to the left and right speaker systems 7a and 7b are also
equal. Good listening conditions are obtained as in the case of. On the other hand, in the offcenter listening position 8b, the sound pressure from the speaker system 7b decreases to 10d,
the sound pressure from the speaker system 7a increases to 10c, and the distance to the speaker
system 7a is up to the speaker system 7b. Because the sound pressure from the left and right at
the listening position 8b is substantially equal, a good listening condition can be obtained.
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1
However, in order to obtain the directivity of FIG. 8, in order to utilize the directivity of the
speaker unit 5, a frequency satisfying Ka = 1 (where λ is the wavelength = 1 / λ, a-diaphragm
radius) The effect is lessened below. Also, at frequencies above the above equation, there is still a
drawback that the quality of the reproduced sound is poor because the cone starts divided
vibration.
SUMMARY OF THE INVENTION The present invention is intended to eliminate the abovementioned drawbacks of the conventional stereo speaker unit, in which a plurality of speaker
units having a directivity band are provided with a step on the flange surface and a center. It is
possible to provide a stereo speaker system which can obtain good directivity over a wide band
and can obtain good three-dimensionality even at positions other than the center of the left and
right speaker systems by arranging them side by side by tilting in the direction. It is the purpose.
Embodiment of the Present Invention The premise of the configuration of the present invention
will be described with reference to FIGS. 3 to 5. FIG. In the speaker system shown in FIG. 7, when
the two speakers 11 for the same sound range are arranged in the horizontal direction as shown
in FIG. The frequency of satisfying the above equation is lowered because the radius of .beta.
Increases, so that the frequency at which the SEC type directivity characteristic of FIG. 8 is
obtained spreads toward the lower frequency range, and the stereophonic feeling at the off
center position 8b. It will be possible to extend the frequency obtained to a lower range.
However, since there are a plurality of speaker units 11, as shown in FIG. 3, there is a path
difference 14 in the distance 11t 13a, 13b from each speaker or uni-node 11 to the listening
position 12, Will produce a large dip in frequency sound pressure. For example, the
characteristics shown in A, B and C of the frequency sound pressure characteristic diagram of
FIG. 5 are obtained with respect to the 3 @ taking position of A, B and C in FIG. Will occur. The
present invention is also intended to eliminate such peaks and dips, and one embodiment will be
described with reference to FIGS. 1 and 2. FIG. In FIG. 1, 15a and 15b are speaker units for the
middle and high range, 16 is its cabinet, 17 is a speaker unit for low range, 18 is its cabinet, and
the speaker units 15a and 15b are The flanges are attached to the cabinet 16 with a level
difference so that the distances to the listening position B become equal. Therefore, at the
listening position B, the distances from the speaker units 15a and 15b become equal, and at the
listening position C, the distance difference can be made smaller than that in FIG. Therefore, the
peak and dip at the listening position eC due to the path difference become smaller as C in the
frequency sound pressure characteristic diagram of FIG. 2, and the sound image at the specific
frequency due to the peak and dip of such frequency sound pressure characteristics. Movement
can be prevented. In the embodiment of FIG. 2, the cabinet 16 for the middle to high range
according to the present invention is installed on the cabinet 1g for the low range in order to
make the cabinet, but the cabinet 16 is implemented as an integrated cabinet. It can also be done.
10-05-2019
2
Also, the present invention can be implemented to a speaker unit for full frequency range.
According to the present invention, as described above, a plurality of speaker units having the
same frequency are arranged side by side to increase an apparent radius, and each speaker unit
is disposed at an angle with respect to the front. Because of this, it is possible to obtain a
frequency characteristic close to that of SEC type by using the directivity of the speaker unit and
extend the characteristic to a frequency lower than that of the conventional one. Then, a step is
formed on the flange surface of each speaker unit, and the peak and dip of the frequency sound
pressure characteristic due to the path difference from each speaker unit at the position W off
the center of the left and right speaker systems are reduced You can reduce the wander. As
described above, according to the present invention, it is possible to perform good stereo
listening with a three-dimensional effect in a wide range other than the center line of the left and
right speaker systems.
[0002]
Brief description of the drawings
[0003]
1 is a plan view showing an embodiment of the present invention, FIG. 2 is a graph of frequency
sound pressure characteristics at each listening position, and FIG. 3 is a plan view of the premise
of the present invention, FIG. 4 and FIG. Shows its listening position, frequency sound pressure
characteristics, Fig. 6 is a plan view of a conventional stereo speaker system, Fig. 7 is a plan view
of a loudspeaker system for obtaining SEC type directivity characteristics, and Fig. 8 is its plan It
is a top view of the speaker system for stereos.
15a, 15b: speaker unit for high to middle frequency range, 16: its cabinet, 17: speaker unit for
low frequency range, 18: its cabinet, A, B, C: listening position and the like Sound pressure at the
position. Patent application Applicant Pioneer Corporation Representative Hideo Kuwano Figure
2
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