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JPS53142304

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DESCRIPTION JPS53142304
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing a conventional
speaker matrix circuit, and FIG. 2 is a circuit diagram showing one embodiment of the present
invention. 1.2 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и power tank 1 @ 5 и и и и и и и terminal terminal board 6 to 9 и и и и и и и front
speakers Terminals 10 to 13 ииииии Rear speaker terminals. 15 иииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
Resistor.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker matrix
circuit for 4-channel stereo, which can enjoy 4-channel or 2-channel stereo reproduction more
widely. 2 FIG. 1 shows a conventional spinot force matrix circuit for 4-channel stereo, and 1.2f'j :,
-y2-K-, 1) 2) input to which reproduction signals of left and right channels are respectively
supplied Terminals 3.4, power supply and width units for left and right channels, 5 are speaker
terminal boards, 6.7 are terminals to which front left (left front) speakers are connected, 8 ░ 9
are front light (right front) speakers connected 10.11 is a terminal to which the rear left (left
rear) speaker is connected, 12.13 is a terminal to which the rear light (right rear) terminal is
connected, and 14 is inserted between the terminal 11 ░ 13 and the ground It is a resistor for
determining a matrix constant. By using such a circuit, it is possible to listen to a 2-channel
stereo signal as a so-called pseudo 4-channel stereo signal. In this case, however, since the
resistor 14 is fixedly inserted between the terminal 11.13 and the ground, both left and right
channel signals are always transmitted from the speakers connected between the terminals
10.degree. And 12.13. The mixed signal of is to be reproduced. For this reason, there is a
problem that (1) the rear speaker must be connected or removed when switching between the 2
channel and the 4 channel. In addition, since four speakers are provided, these are used as two
sets of two speaker systems, set in a room consisting of sets, and another set in another room,
each room Sometimes you want to enjoy 2 channel stereo playback. However, in the
configuration as shown in FIG. 1, there is a problem that such a convenient method does not
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come because the speaker connected by vc connection between terminals 10.11 and 12.13 only
operates as a rear speaker. . In addition, since the value of the resistor 14 is fixed, the matrix
constant is fixed uniformly even when performing 4-channel stereo reproduction, so that the 4channel effect can not be maximized depending on the sound source. There is also. The present
invention provides a speaker matrix circuit that solves such a problem. An embodiment of the
present invention will be described below with reference to FIG. In FIG. 2, the same symbols as in
FIG. 1),-and parts have the same functions.
Reference numeral 15 denotes a changeover switch having movable contact pieces 1sa and 1sb
interlockingly connected to each other. The common terminal is grounded, and one fixed
terminal a is connected to the ground side end insulator 9 of the front speaker. The fixed
terminal C is connected to the ground side terminal 11.13 of the rear speaker. 16.17 is a mode
switch which switches in conjunction with each other to switch matrix constants of 2-channel
and 4-channel and 4-channel, and 18 and 19.20 are resistors which determine the matrix
constant. In the above configuration, if the switch 16.17 is connected to the terminal aVc as
shown in FIG. 2 and the movable contact pieces 15a and 15b of the changeover switch 15 are
connected between the terminals a and l) in this state, the speaker terminal 6, Only the speakers
connected between 7 and 8 and 9 are driven, and 2-channel stereo reproduction can be
performed with these speakers. Also, with the switch 16.17 connected to the terminal a, as it is,
turn off the switch 1??5 ? ? movable contact piece ? ? ии ? 5 o'clock end end + ? ? ? ?
? ? ? b?l VC @ athId и ?1 ? ? ии , Only the speakers connected between 12.13 are driven,
and in this case no resistance is inserted between terminal 11.13 and ground, so that the mixed
signal of both channels is reproduced from the two speakers It will not be played, and the usual 2
channel stereo will be played back. For this reason, two speakers connected between the speaker
terminals 6, 7 and 8 and 9 are installed in one room [, and two speakers connected between the
speaker terminals 10. 11 and 12. 13 are installed in another room. If the switchback switch 15 is
switched in this state, normal two-channel stereo can be listened to in each room. On the other
hand, when the movable contact pieces 16a and 15b of the changeover switch 15 are connected
between the terminals a and b, the mode switch 16.17 is switched to the terminal switch. 91-1:
Grounded via the changeover switch 15, and the rear ground side terminal 11.13 is grounded via
the mode switch 16.degree. 17 and the resistor 2o. The four channel speakers perform four
channel stereo reproduction, and the matrix constant at that time is determined by the value of
the resistor 20. When the mode switch 16.17 is switched to the terminals c and dVc, the matrix
constant is determined by the value of the resistor 19.20 and the value of the resistors 18 and
19.20, respectively. Therefore, by switching the mode switch 16.17, the most effective 4-channel
stereo reproduction can be performed according to the sound source.
As described above, according to the present invention, the switching of 2-channel and 4-channel
and the switching of matrix constant in 4-channel can be easily performed with a very simple
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configuration, and the rear speaker can be operated as a 2-channel speaker. Therefore, these two
speakers can be installed in a room separate from the other two spill powers, and each room can
listen to a two-channel stereo, greatly increasing the stereo reproduction function compared to
the conventional one. Can be 0
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