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JPS57131091

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DESCRIPTION JPS57131091
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1, 2, 3, 4 and 5 show a conventional example of a
speaker switching circuit, and FIGS. 6, 7 and 8. FIG. 9 is a view showing the operating state of the
speaker switching circuit of the present invention. 8.9 · · · 1st speaker system, 10 ° 11 ··· · · · 2nd
speaker system, 12 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 1 first speaker system, 10
° 11 · · · · · · · · · · · · · · left channel amplifier, 14 ··· First selection switch, 15 ··· Second selection
switch.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker
switching circuit for selecting two series of speakers connected to a high power amplifier.
Conventionally, a switching circuit as shown in FIG. 1 is used as a switching circuit for switching
two speakers connected to an amplifier. That is, the speaker (1) and the swing) beaker (2) are
switched by switching the push-down switch (3) + 4) and selectively connected to the amplifier
(5), as shown in FIG. 1). When none of the switches is operated, both the speakers + 11 + 21 are
disconnected from the amplifier (5), and the operation of the switch (3) in the arrow direction as
shown in FIG. And the speaker (2) is connected to the amplifier (5) by the operation of the switch
(4) as shown in FIG. 3 and% as shown in FIG. When operated, the speakers tll [2) are connected
in series, and the speakers (1) (2) are parallel-loaded] to prevent the amplifier (5) from being
overloaded. 981) 4 The fifth factor shows the case of a stereo amplifier, and the left dannels
beaker (8) (right) by operation of the switch 161 (7), the right channel speaker t91 tlll, the left
channel amplifier home and the right channel amplifier ( It is structured so that it is selected and
connected to Il as described above. By the way, a recent amplifier tends to have a large output
because a maximum of about 5 m of current flows in the 69% speaker. The switch for switching
the speaker also needs a capacity capable of interrupting the magnetic current τ \ of about 5 A,
but in a normal push-button switch, the current storage is small, so the switch for large output--In the case of W15, the switch requires 16 circuits with twice the number of circuits, which
increases the cost and size of the switch, resulting in a large mounting area. Although
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improvement is requested, though. Therefore, the present invention has been made in view of
this point, and by effectively utilizing the empty terminal of the switch of the conventional
switching circuit, a speaker switching circuit in which the increase in the number of circuits
when connecting switch contacts in parallel is reduced. To provide 91 rivers 5 and below
Embodiments of the present invention will be described with reference to the drawings. Working
l3 is the left channel amplifier and the right channel amplifier. t81 (S1 is the first speaker system,
(8) is for the left channel, (9) is for the right channel. The tillCIll is the second speaker system,
and the screams are for the left channel and I is for the right channel.
The first selection switch consisting of six circuits connecting the first speaker system to the
amplifier α シ ス テ ム 1s, the same as the second circuit connecting the second speaker → the
system to the amplifier 113111 To the second Haruka: It is a choice switch. The first circuit
(141) of the first selection switch is connected to one terminal (141 is connected to the common
terminal (144) of the fourth II (144), and the speaker of the second speaker system ←] Terminal
is connected. The common terminal (141) of the first circuit (141) is connected to one terminal
(144) of the fourth circuit (144) and the other terminal (145) of the fifth circuit (145), and the
left channel amplifier Connected to the output of Buddhayu. And the other terminal (141 of the
first circuit (141) is the same as the fifth circuit (145)). The terminal (145a) is connected to the
terminal K and connected to the (G) terminal of the left channel speaker (8) of the first SUV 916
car system. Next, the second circuit (142) is connected to one terminal (142 b) empty terminal,
and the common terminal (142 m) is connected to the other terminal (145 ') of the sixth circuit
(145) and the right of the first speaker system Danners beaker (The first (not connected to the
terminal. The other terminal (1420B of the fi2 circuit 142) is connected to the common terminal
(145 of the fifth circuit (145) and one of the sixth terminal 1111 (146) and the right channel
Connected to the output of the amplifier an. The fifth circuit (145), one terminal (145 is
connected to the common terminal of the sixth circuit (146)) terminal (146, and the second
speaker system's right dannels beak G) It is connected to the terminal. Next, the second selection
X1'f (1'J, the first W & (151) tv one terminal (151 is grounded, the common terminal CICl5l is
one terminal (154 of the fourth circuit 154) And the H terminal of the left channel speaker (8) of
the first speaker system. The other terminal (151) of the first circuit (151) is connected to the
other terminal (1440) of the fourth circuit (144) of the first switch s927 selection switch I. Next,
the second circuit (15υ is one terminal (152 is the third common terminal of K (155)? (15!
It is connected to a) and connected to the right channel speaker (terminal 940H) of the first
speaker system. And common terminal (15!
aM grounded, the other terminal (152) is connected to the common terminal (154a) of the sixth
circuit (154), and the 7 right channel speaker (1112) H terminal K11l of the second speaker V
stem is connected to I have j. One terminal (1551s) of the sixth circuit (155) is grounded, and the
other terminal (153) is connected to the other terminal (146) of the sixth circuit (144) of the first
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selection switch a4. The fourth circuit (154) is connected to the common terminal (154 is
grounded and the other terminal (154) is connected to the common terminal (155) of the fifth
circuit (155), and the left speaker of the second speaker V stem is It is connected to the H
terminal of the penetration beaker. Fifth. In the sixth circuit (155) (154), one terminal (755k)
(154b) is an empty terminal and the other terminal (1556) (154) is grounded. The selfexplanation 938 will be performed according to the operation of the present invention having
the following configuration. First, as shown in FIG. 6, when any one of the first and twenty-fourth
selection switch + 11 is not operated, the speaker (81 (93Qll (131 is a first digit) of the second
speaker system). All the amplifiers ua [13 to 911ii1 are disconnected. Next, when the first
selection switch α1 is operated, the first speaker V stem (in the state shown in FIG. 7) is
connected to the amplifier datt3. That is, the left channel terminals are on the 11th! It is
connected to the left channel amplifier via the 1st, 5th circuit (141 X 145) of the 1st switching
method → →, and the θ terminal is the 1st to 1st of the 24th switching switch + 11th. The left
channel speaker (8) is driven by the left channel amplifier [I] by being grounded via the fourth
circuits (151) (154). On the other hand, the cloth deannel speaker (91, ←) terminal is connected
to the right channel amplifier (11) via the second and third circuits (142X14S) of the first
selection switch I, and the H terminal is the second selection switch day. 2. The right tunnel
amplifier beaker (9) is driven by the right tunnel amplifier filK by being grounded via the S-th
circuit (152 × 155). In this case, all the switch contacts are connected in parallel. It is possible to
interrupt the current. Next, when the second selection switch uFj is operated, the ninth speaker
system shown in 48- is connected to the amplifier -13u. That is, the (D) terminal of the left
dannels beaker is connected to the left channel amplifier drain via the M1 of the first alternative
switch I4 and the fourth circuit (141 X 144), and the + i element is the second alternative switch
I. The left lane beaker is driven by the left amplifier) 12) by being connected via the 4th and
5th% (154) (155).
On the other hand, the right channel speaker I is amplified via the (G) terminal or the third and
sixth M (145 × 144) of the first alternative switch node I! 1) WIK connection, the H terminal is
the second selection switch of the second selection switch j51 2. The right channel speaker I is
connected to the right channel amplifier iqA 1 '! Rather than being grounded via the sixth circuit
(152) (156). It is driven by J. In this case, all the switch contacts are connected in parallel, and
can perform large @ 1 disconnection. Next, the case where the first and second selection switches
.alpha. Set 1 are simultaneously operated will be described with reference to FIG. At this time, the
H4 terminal of the left channel speaker (8) of the 9510 first speaker V stem passes through the
first circuit (151) of the second selection switch 115 and the 84 circuit (144) of the 14th
selection switch 俣The left channel speaker (810G; N, left channel increase W-one) connected in
series to 19 ° is connected to the left channel speaker FlucD (1) -1 of the two-speaker system.
That is, the \ (to) terminal of the left channel speaker (8) of the first speaker system is the first
and fifth circuit of the first selection switch 1 尋. 141 x 145) * Oh, 1 aya 2 ° work. , The left
channel speaker of the '42 speaker system ', which is continued at 4 °, is the second selection
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switch dj's fourth. By being grounded via the fifth circuit (1548155), the left channel speaker
181fil connected in series is driven by the left terminal * i + i unit Ua. In this case the first
speaker V Sudem left channel speaker (8) t-3? J-F and the fourth circuit (144) of the first
selection switch 1a for connecting the upper terminal of the left channel speaker of the second
speaker system and connecting the left channel speaker 18+ [11t-a series after a series .
Although the contacts of the first circuit (151) of the 9011 second selection switch (c) are not in
parallel configuration, there is no particular problem because the impedance is doubled by the
series connection of the speakers and the driving voltage tlL is halved on the contrary. .
Meanwhile, the (C) terminal of the right channel speaker (9) of the first speaker system is the
third! The selection switch is connected in series to the (G) terminal of the right channel speaker I
of the second speaker system via the fourth circuit (15M) of the fourth and the sixth circuit (146)
of the first selection switch I. Nine right Dannels beakts connected (91! Lm is connected to the
right channel 11malllK.
That is, the (upper terminal of the right channel speaker (9) of the first speaker ス Sdem is
connected to the right channel via the W12 of the first selection switch I, the 26th circuit (142)
(143), and the IK connection 11: IK The (2) terminal of the right channel speaker Sumiba of the
2nd Sbi Kura-V stem is done! The second choice of the 82 choice switchgear dω. The right
channel speaker (9) I connected in series by j% is placed by the right channel amplifier t) by tll
ground via the sixth circuit (152 バ 156). Also in this case, the contact point of the sixth circuit
(146) of the 1st j switch D in a series connection of the right dannels beaker 19J119712 and the
third circuit (155) of the second selection switch 4 is not parallel configuration. As described in
(1), the driving current is halved and there is no sentence. As described above, the speaker
switching circuit according to the present invention switches the output of a large output
amplifier by a configuration in which switch contact contacts are parallelized, and the number of
circuits 16 required when simply paralleling is four circuits and 12 circuits In addition to
achieving the downsizing of the switch, it is possible to measure the color cost and to switch the
large output with four regular switches and switches, which has a large practical effect.
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