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JPS4966401

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DESCRIPTION JPS4966401
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a plan view showing a conventional speaker
arrangement, FIG. 2B is a plan view showing a speaker arrangement of the present invention, and
FIG. 3 is used for the present invention FIG. 4 is a circuit diagram of the control unit. AF: Speaker
hs1 to S4 Selector switch, Rbe, Rdf: Variable resistor. Fig. 1 Fig. 2 {No} -1- actual opening 4966401 (2) Fig. 3 U Fig. 4 -2-
[Detailed description of the invention] The standard arrangement of speakers in 4-channel stereo
reproduction is what is called a so-called 2-2 system, and as shown in FIG. Each x beaker a ビ ー
カ ー b + c + di is arranged so that two speakers are arranged in front of the listener M and two
speakers are arranged behind it. However, as shown in Fig. 1 (b), when playing classical music,
such a speaker arrangement makes it feel like you are in the orchestra and listening to it, and it
becomes unnatural. It is practiced to arrange four speakers a9b に eld in a trapezoidal shape at
the front. Thus, although it is desirable to select the arrangement of the speakers according to
the program, it is difficult to move the speakers each time. This invention is like the above! ! The
present invention is based on the patent 2), and it is an object of the present invention to make it
possible to select the reproduction of the above two methods without moving the entire speaker,
and to prevent useless speakers. In the present invention, six speakers A-F are used as shown in
FIG. The speakers A to D are arranged in a trapezoidal shape in the front as in FIG. 1 (b), and the
speakers E + F are arranged in the rear corners. As shown in FIG. 6, a 4-channel stereo signal is
distributed to each of the speakers AF through the control unit U according to the present
invention. FIG. 4 shows the circuit of the control unit U Are the input terminals of the first to
fourth channels, which are respectively connected to the output terminals of the 4-channel stereo
amplifier. Reference numerals 1 to 6 denote output terminals, which are respectively connected
to the speakers AF. S, S4 to S4 are selector switches of six contacts, which are interlocked with
each other, and each movable contact is connected to the output terminal n + (fj) + [F] (3).
Further, the output terminal {circle around (1)} is directly connected to the input terminal {circle
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around (ν)}. It is directly connected to the changeover switch S +. The first contact of the
changeover switch S + is connected to the input terminal 1; the second contact is connected to
the input terminal 1; and the sixth contact is connected to one end of the variable resistor Rbe.
The first contact of the changeover switch S is connected to the input terminal 1 and the sliding
terminal of the variable resistor Rbe, the sixth contact is connected to the other terminal of the
variable resistor Rbe, and the second contact is idle. Similarly to the changeover switch Ss + St,
when switching to the position of the first changeover switch S connected to the input terminal f
and the resistor RdfiC in the same manner as the changeover switch Ss + St, the speaker A.nu.
The speakers COD are connected in parallel and connected to the input terminal 1.
In addition, the speakers E 接 続 F are connected to the input terminals I and B, respectively.
Therefore, as shown in FIG. 2 (a), the first channel swing from the speaker AyB disposed on the
front left side and the sixth channel from the loudspeaker C + D disposed on the front right side
are reproduced, and the rear left (4) right Since the second ν fourth channel is reproduced from
the speakers E and F arranged in the system, it becomes a so-called 2-2 system. When the
changeover switch S, -S is switched to the position of the second contact, the speakers A) B + C +
D are respectively connected to the input terminals {circle over (1)} {circle over (1)} {circle over
(2)} to play the speaker E + F 'id. Therefore, as shown in FIG. 2 (b), when the changeover switch S
to be the reproduction system of the front mold is switched to the position of the third contact,
the speaker ApC1- is connected to the input terminal 1--. The speaker BIE is connected to both
ends of the variable resistor Rbe, and the speaker I) + F is connected to both ends of the variable
resistor Rdf. Since the slide terminals of the variable resistor Rbe + Rdf are connected to the input
terminals {circle over (1)}, respectively, the twelfth channel and the sixth channel are reproduced
from the speaker AνC, as shown in FIG. Two channels are reproduced from the speaker D + F to
the fourth channel. And since the ratio of the output of the 2nd channel reproduced from speaker
B1 (5) E changes by sliding the sliding terminal of variable resistance Rbe, the speaker for the
2nd channel is moved back and forth It has the same effect as Since the ratio of the output of the
fourth channel reproduced from the speaker DνF can be changed by sliding the sliding terminal
of the variable resistor Rdf, the same result as moving the speaker for the fourth channel back
and forth Become. As described above, according to the present invention, the speaker
arrangement of the 2-2 system and the front mold system can be obtained by the mode
switching by the changeover switch without moving the speaker, so the speaker arrangement
suitable for the program can be obtained. In addition, as shown in FIG. 2e, it is possible to
continuously move the position of the rear speaker back and forth as shown in FIG. 2e. Because
the effect is the same, a more optimal speaker arrangement can be obtained. And although it
requires two extra speakers, it can be used without waste.
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