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JPS56142193

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DESCRIPTION JPS56142193
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an example of a
conventional multi-way speaker system. FIG. 2 is a block diagram of one embodiment of the
present invention. FIG. 3 is a block diagram of one embodiment of the present invention applied
to a two-way speaker system. FIG. 4 is a generalized block diagram of an embodiment of the
present invention. FIG. 5 is a block diagram of an embodiment of the present invention expanded
to three outputs. 2 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · Voltage amplification stages, 9 and 14 · · · · · Power amplification stages, 10.1, 12,
13, 15. · · · · · · · · · Impedance circuits, 18 and 19 · · · · · Power amplification Stage.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an amplification
circuit for a multi-way speaker system in which the attenuation function of a squawker, tweeter
or the like conventionally provided on the speaker side in a multi-way speaker system is installed
in an amplification circuit. A conventional multi-way speaker system is constructed as shown in
FIG. 1 by way of example of a two-way speaker system. Reference numeral 1 denotes an
amplification circuit, 2 denotes a capacitor forming a bypass filter, 3 denotes a tweeter, 4
company coils, and 5 denotes a low pass filter. 6 is a woofer and 7 is an attenuator for level
adjustment, which is a variable resistor. In general, the sound pressure level between the woofer
and the tweeter is different, so the attenuator 7 is provided in the two-way speaker system, and
the frequency characteristic of the sound pressure is flat (2). Adjust to become 'D. Therefore,
since the tweeter, the squawker, etc. have a sound pressure level higher than that of the woofer,
by providing an attenuator as shown in FIG. 1, the purpose of flattening the frequency
characteristic of the initial sound pressure level is achieved. However, since the attenuator is
inserted, the signal source impedance viewed from the tweeter side also rises in the pass band of
the bypass filter, the damping factor of the tweeter decreases, and the sound quality is greatly
affected. In addition, although a multi-channel amplifier system has been considered to solve the
above-mentioned drawbacks, there is a drawback that the number of amplifiers is the same as
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the number of channels, which is very expensive. SUMMARY OF THE INVENTION The present
invention is conceived in view of the above-mentioned drawbacks, and it is an object of the
present invention to provide an amplifier circuit for a multi-way speaker system which
overcomes the above-mentioned drawbacks. The present vA company can set the level difference
of the output voltage and configure an amplification circuit with one power and multiple outputs,
and the attenuation function of the squawker, tweeter, etc., which was conventionally provided
on the side of the speaker It is something that is provided as a reward. Hereinafter, the present
invention will be described by way of examples. FIG. 2 is a block diagram of one embodiment of
the present invention, which is an example applied to a two-way speaker system. Reference
numeral 8 denotes a voltage amplification stage, and 9 power amplification stages respectively,
which constitute a negative feedback amplification circuit by impedance circuits 10 and 11, and
an amplification circuit consisting of voltage amplification stage 8 and power amplification stage
9, The output of the amplification stage 9 is output to the output terminal 0UTl, and the output
voltage of the power amplification stage 9 is divided by the impedance circuits 12 and 13, and
the voltage applied to the impedance circuit 13 is the input voltage of the power amplification
stage 14, The output of the power amplification stage 14 is output to the output terminal 0 UT 2,
and negative feedback is applied to the input side of the voltage amplification stage 8 through
the impedance circuit 15.
In the present embodiment configured as described above, the input voltage applied to the input
terminal f4) -11 ° is connected to the output voltage of the output terminal OUT1, the output
voltage of the output terminal OUT1 to the output voltage of the output terminal 0UT2, and the
impedance circuit. Assuming that the impedances of 10.11.1.13 and 15 are Z1, Z2, z4, Z5 and
Z3, respectively, and the naked voltage gain A of the voltage amplification stage 8 is set
sufficiently large, between the input voltage e1 and the output voltage E1. The relationship of
1111 z 5 (Z1 + Z2 + Z3 ′ ′ ′) = (Z2 ′ ′ Z3 (Z4 + Z5) ′ ′ ′ is established. Therefore, the
gain Ay of the amplifier circuit consisting of the voltage amplification stage 8 and the power
amplification stage 9.14 is set to IAv knee 11111Zs = (Zt + I18) (Seventh Zy (Z4 or 2.). )), 5E2
between the output voltages E1 and E2: □ E. There is a relationship of Z4 + Z5. That is, the level
difference between the output voltages El and E2 can be set arbitrarily by setting the impedances
of the impedance circuits 12 and 13 and (5) ′ ′. The voltage gain of the power amplification
stages 9 and 14 is one. Therefore, the connection point of the impedance circuit 11.12 may be
connected to the output end of the voltage amplification stage 8 without being connected to the
output end of the power amplification stage 9. As described above, the amplification circuit with
one power and two outputs, impedance circuits 10.11 and 15 with resistors 10 ', 11' and 15 ',
and impedance circuits 12 and 13 with variable resistor 16, tweeter 5 and woofer 5 When 6 is
connected, it becomes as shown in FIG. Therefore, according to this embodiment, as shown in
FIG. 1, the attenuation circuit 7 between the amplifier circuit 1 and the bypass filter 2 is
eliminated, and the attenuation circuit 7 moves to the input side of the power amplification stage
14. The reduction of the damping 7 actor disappears, and the damping 7 actor of the tweeter 5 is
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greatly improved. Next, the circuit company of one embodiment of the present invention shown
in FIG. 2 is generalized and shown as a block diagram shown in FIG. 4 (sr,? It can be done by 7
days '7'. In FIG. 4, reference numeral 17 denotes an amplification circuit composed of a voltage
amplification stage 8 and a power amplification stage 9, and 18 denotes a power amplification
stage having a transfer function H (S). In this case, assuming that the naked voltage gain A of the
voltage amplification stage 8 is sufficiently large, the gain between the input voltage e1 and the
output voltage E, E2 is Fitll11 η − ((47) + z,) / (う 5 + i1 H (S) "2111111 el-籟 7 h +)) z, + Z2"
top layer). Also in this case, a level difference can be obtained between the output voltages El and
E2 by the transfer function H (8).
In the above, the case of applying to the 2-way speaker system has been described as an
example, but it can be easily extended to the case of applying to the 3-way fist speaker system,
and applied to the 3-way speaker system An example of the case is as shown in FIG. In FIG. 5, 19
is a power amplification stage having a transfer function n (s) and is for squawker, and 20 is an
impedance circuit for negative feedback of the power amplification stage 19. 6.1 · “1--7 C path
It is. Also in the case shown in FIG. 5, the reduction of the damping factor is eliminated as in the
above case. Further, the same can be applied to the case where the number of outputs is
expanded to three or more. As described above, according to the present invention, the first
power amplification stage having the first power amplification stage having the negative
feedback loop from the output terminal to the input side, and the negative feedback loop having
the output terminal to the input side Voltage level between at least one or more second power
amplification stages receiving the voltage from the output terminal of the stage, and the output
voltage of the first power amplification stage and the output voltage of the second power
amplification stage It consists of level difference generating means to give a difference, and it has
2 or more outputs by one power, so tweeter of multi-speaker system and damping 7 actor of
squawker will not be reduced, the fault of the conventional multi-speaker system Can be
eliminated. Also, the voltage amplification r is equal to the power amplification stage, and a
conventional multi-channel amplifier system -j. (8) τ) Mi that can be configured at low cost
compared to the system. J♂″−ゝがある。
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