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JPS57131092

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DESCRIPTION JPS57131092
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1, FIG. 2, FIG. 3, FIG. 4, FIG. 5 show prior art
examples of the speaker switching circuit, FIG. 6, FIG. 7, FIG. FIG. 9 is a view showing an
operating state of the speaker switching circuit of the present invention. 8.9 ...... first speaker
system, 10 ° 11 ...... second speaker system, 12 ...... left-channel amplifier 1.13 ...... right-channel
amplifier , 14 ...! · · · 1st selection switch, 15 · · · · · 2nd selection switch.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker
switching circuit that selects two speakers connected to a high power amplifier. A switching
circuit as shown in the prior art 911 is used as a switching circuit for switching between the two
systems of speakers connected to the amplifier. That is, the speaker (1) and the speaker (2) are
switched by operating the bush switches (3) and (4) and selectively connected to the amplifier
(5), and as shown in FIG. The speaker (1) (2) is disconnected from the amplifier (5) for a while,
and as shown in FIG. 2 (the operation of the switch (3) in the direction of the arrow causes the
speaker 10 to Connected to Also, as shown in FIG. S, by the operation of the switch (4), the
junction-':,-*-12) is connected to the amplifier (5) and j! If switches (3) and (4) are operated
simultaneously to make a turn as shown in Fig. Kg / 74, the speaker tllt 21 is connected in series
and the speaker (tlt 2) is a parallel load 9 amplifier (5 ) To prevent overload. FIG. 5 shows the
case of a stereo amplifier, and the left channel sneaker (8) ("") and the right channel speaker (9)
are operated by the switches (6) and (7), the left channel amplification 5tta and the right channel
Each of the amplifiers us is configured to be selectively connected as described above. By the
way, recent amplifiers tend to have a large output. Since a current of up to about 5 A flows in the
speaker, the switch for switching the speaker also needs a volume I capable of interrupting the
54 ° -flow, but! In the case of a large output increaser #A, the switch contacts must be in
parallel in the case of a large output increase #A, and in the case of FIG. 5, the number of circuits
is doubled. Of 16 circuits, and the cost is high and the switch is large and the mounting area is
large. Further, the increase in the number of circuits causes problems such as wiring becoming a-
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lined, and there is a need for improvement, and I / '1 friend. 従 木 考 案 鑑 み was made in view
of this point. In addition to reducing the increase in the number of circuits when connecting the
switch contacts in parallel, the present invention provides a total of five speaker switching
devices with simplified wiring. An embodiment of the present invention will be described below
with reference to the drawings. 0 is the left channel amplifier and the right channel amplifier, (8)
t91 is the first speaker system, (8) is the left channel, and (9+ is for the right channel. -11 ul) is
the second speaker system,-is the left channel, and un is for the right channel.
[141 is a first speaker ス テ system ス テ amplifier 1. A first selection switch consisting of six
circuits connected to I 31 s, and a second selection switch consisting of six circuits similarly
connecting the second speaker V stem to the amplification 191 113. The first and second WA
paths (141) (142) of the first selection switch 4 are connected in parallel, and one terminal (141bar 42) is connected to the common terminal (1469 of the 1g6 circuit (146) and (1416) (1420)
is connected to the left channel amplifier, and the other terminal (142) is connected to the left
terminal of the left speaker of the second speaker system. 1 speaker 1 is connected to the (a)
terminal of the left channel speaker (8) of the stem. And sixth. The fourth circuits (145) and
(144) are also connected in parallel, and one terminal (145) (144b) is connected to the common
terminal (145) of the fifth circuit (145) and the right of the second Svaiger ガ ー stem It is
connected to the Dannersby bird-uncD (e) terminal, and the common terminal (14S (144 is
connected to the right channel amplifier) and the other terminal (145o) (1446) is the right It is
connected to the (g) terminal of the channels beaker (9). Next, in the second selection switch 4,
the first and second circuits (151) and (152) are connected in parallel, and one terminal
(151bX1szb) is connected to the common terminal (155a) of the fifth circuit (155). Is connected
to the H terminal of the left channel speaker (8) of the first speaker system, and the common
terminal (152 (152 is grounded) and the other terminal (1510) (1520) is the left of the second
speaker V stem It is connected to the H terminal of the channel speaker-. The third and fourth
circuits (153) and (154) are also connected in parallel, and to one side, +2) 4? (155 b) (15 “) t *
6 @ I j l (15 S) o A a 4 F” (connected to the H terminal of the right speaker of the first speaker V
sound dome (9) while being connected to 156 mm) The common terminal (155 &) (154 &) is
grounded, and the other terminal (155 @) 1540 is connected to the H4F− of the right channel
speaker Sumi〃 of the second speaker system. In the fifth circuit (155), one terminal (155b) is an
empty terminal, and the other terminal (155) is connected to the other terminal (14Ao) of the
sixth% (146) of the first selection switch terminal u4, One terminal (156b) of 6 circuits (154) is
an empty terminal.
The other terminal (1560) is configured to be connected to the other terminal (1451) K411 of
the fifth 0117 path (145) of the 131 th switch. The operation of the present invention based on
the following Kyfr will be described. First, as shown in FIG. When none of the second selection
switches [+410 is operated, the first degree St speaker VX te j, (DXX-11s) 191 LMII 11 ha. All are
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separated from the amplifier 0I. Next, when the second selection switch I is operated, the state
shown in FIG. 7 is reached and the first speaker system is increased, 11i! 11M1f16.0 "7" '1' "1-J
car (8) terminal is connected to the left channel amplifier μ via the first and second circuits
(1418142) of the first selection switch +14 in it1m113, As the H terminal is grounded via the
first and second circuits (151) (152) of the II2 selection switch, the left channel beaker (8) is
driven by the left channel amplifier. On the other hand, the デ terminal of the right dannels
heaker (9) is connected to the right channel amplification 6th via the third and fourth circuits
(143 x 144) of the first selection switch +14, and the H terminal is the second selection The right
channel speaker (9) is driven by the right channel amplifier 0 by switching the switch 〇 6th and
4th DOjl (15M and 1s4) to 11 [jll]. In this case, all the switch contacts are connected in parallel,
and large current can be interrupted. Next, when the second selection switch +19 is operated, the
state shown in FIG. 8 is obtained, and the second speaker system is connected to the amplifiers
□ and 13 ×. That is, the (+) end of the left dannels beaker is connected to the left channel
amplifier α via the first circuit (141 × 142) of the second selection switch α 尋, and the H
terminal is By the second selection switch [grounded via the first and second circuits (151) (152)
of 19], the left channel speaker is driven by the left channel amplifier α. On the other hand, the
(D) signal of the cloth dannern speaker C1l is the third of the first elector switch switch α4.
Increase the right channel via the fourth circuit (143) (144) · lI! ! The right channel speaker liυ
is driven by the right channel amplifier [+3] by connecting the 4H to the 4113 and grounding
the% H terminal via the third and fourth circuits (155 X 154) of the 2.11 option switch Q9.
Also in this case, all the switches are connected in parallel, and a large current 013? Can be done.
Next, the first one. The case where LJa is simultaneously operated will be described with
reference to FIG. At this time, the H terminal of the left channel speaker (8) of the first speaker
system is connected via the fifth circuit (155) Ht first selection x (yf L4) lli 6 circuit (146) of the
second selection switch circuit. The left channel speaker (8IIMI connected in series with the left
channel speaker (8IIMI) is connected to the left channel input @ 嶺 0) by the (sword; sword
connected to Takako) of the left channel speaker (() of the speaker system. That is, the left
channel speaker (8 J's) of the first spa beaker system. 1ゆ、3. □3イッfr14(D*1.
□ H terminal of the left channel speaker of the second speaker V stem which is connected to the
left channel amplifier via channel I (141 X 142) is the 1% second circuit (151) (151) of the
second selection switch as (151) ( By being grounded via 152), the left channel speaker -t8) tIa
connected in series is driven by the left channel amplifier a3). In this case, the H terminal of the
left channel speaker (8) of the first speaker system and the (channel) terminal of the left channel
speaker ilG of the second speaker V01410 stem are connected to connect 15 channels of the left
channel speaker (8)- The contacts of the sixth circuit (t46) of the first selection switch 14 and the
IJ5 circuit (155) of the second selection switch lL do not have a parallel publication
configuration, but the impedance is doubled by the series connection of the speakers and the
reverse There is no particular problem because the drive 4 flow is halved. On the other hand, the
H terminal of the right channel speaker +91 of the first speaker system is the second circuit of
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the second speaker system via the sixth circuit (156n of the second selection switch tls and the
fifth circuit (145) of the first selection switch). The right channel speaker · A, '1. 'Tsn is connected
to the right channel increment 0 ul. That is, the (+) terminal of the right channel speaker (9) of
the first speaker V stem is connected to the right channel amplifier 13 'via the 4S of the first
selection switch I and the fourth circuit (143X144). The H terminal of the right channel speaker I
of the two-speaker V stem is the fifth of the second selection switch αS. Since the fourth circuit
(155 × 154) is grounded via the terminal K, the right channel speaker (91 (1 m is driven by the
right channel amplifier l in multiple connection) connected in series.
Also in this case, the fifth circuit 171 (1 砺) of the mth selection switch a4 in which the right
channel is connected in series and the sixth circuit (156 of the second selection switch σ9) are
connected in parallel. There is no problem, however, as the drive current is halved as described
above. As described above, the speaker switching circuit according to the present invention
switches the output of the large output amplifier by the configuration in which the switch
contacts are parallelized, and in the case of simply paralleling, the circuit number 16 required is
four circuits and four 12 circuits. By making it compact, the switch can be downsized, and the
cost of the switch can be reduced, and the first and second circuits and the fifth and fourth
circuits connected in parallel simplify the wiring and lower the circuit impedance. It is also
effective to prevent breathing of damping pump and so on (by switching the large output with a
normal bush switch, and it has a large practical effect.
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