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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of a speaker switching
device according to the present invention, FIG. 1 is a connection diagram showing connection of
contacts of each relay, and FIG. 2 is a connection diagram showing connection of each relay, 3
and 4 show the time charts of FIG. 1 and FIG. 2, respectively, and FIGS. 3a, 3b and 3c respectively
show the speaker changeover switch, the contact of the muting relay and the speaker changeover
relay 4a shows the on / off operation of the speaker changeover switch, and FIG. 4c and FIG. 4c
show the detection signal and output signal of the time limit circuit, FIG. 4d, e and f show the
integration circuit, Schmitt trigger circuit and FIG. The respective output signals of the trigger
flip-flop circuit, and FIG. 6g respectively show the operation of the contact of the speaker
switching relay. AMP・1. Power amplifier, RLO: relay for muting, RLO: contact for relay for
muting, RL1, RL2: relay for speaker switching, RL1 ′, RL2 ′: contact for relay for speaker
switching, SW1 , SW1 '. SW2. SW2 ′: speaker changeover switch, TL1, TL2: time limit
circuit, IG: integration circuit, CT: Schmitt trigger circuit, FF: trigger flip flop circuit, RDC: relay
drive circuit .
[Detailed Description of the Invention] In this invention, a speaker (1) is used to switch and
connect several speakers to a power amplifier by switching off a relay, Tz (13- = h? The
momentary muting of the power amplifier, the relay, and the switching of the speaker are
performed to prevent the deterioration of the contact life of the relay and the generation of high
frequency noise. The present invention relates to a speaker off 4 device which is designed to be
east. Generally, when a plurality of speakers are switched to and connected to an amplifier
having a power amplifier, if a speaker disconnecting device is interposed in one stream of the
amplifier and each of the speakers 7, wiring between the amplifier and the speaker can be
routed. In order to cause bad J +, a speaker cut-off device composed of an amplifier number, a
relay, etc. is installed to achieve one reduction in impedance. However, in the conventional
amplifier provided with this power amplifier 8 and the speaker switching device, when the
speaker is switched by turning over the relay of the speaker switching device while the speaker is
driven by the human output of the amplifier, the contacts of the relay Will turn off the large
current, and the relay contacts will deteriorate and 14 times return. In addition, in the reception
+ = S, -1 wave noise is generated when the relay is turned on and off, and there is a disadvantage
that it prevents broadcast reception (-). +21!! 渚 '[Present] This device pays attention to the
above-mentioned conventional problems, and at the time of switching operation of the speaker,
the input signal to the power amplifier is momentarily muted to be in a no signal state, and then
the relay is driven. In the first embodiment, the contact point is turned on and off, and then
muting is released to perform normal operation. Finally, this invention is shown in FIGS. 1 and 7
showing one embodiment of the present invention. It will be described in detail. In the S1
diagram showing the connection of the contacts of each relay, the mountain is the input terminal,
(RLO) 'is one end or the contact of the muting relay at the input terminal 11 and (AMP) is the
human power, +111,)) Power amplifier connected to the contact point (RLO) 'of the relay for
muting, (RLI)' + (RL2) 'is each-one power an 7 (AMP)・ L and the second speaker switching relay
connected to the output of the switch · x, a, (ol), (o2) are the town speaker switching relay
contacts (R1, 1) ', (RL2)' The two other speaker terminals are sent out from the other end of each,
and are respectively connected by a speaker (not shown) or 1 #. (3) In FIG. 2 showing the
connection of each relay, (+ B1) is a DC power supply, (SW1), (SW2) is a 弔 1 connected to one
end or DC power supply (+ B1) and the power 2 main speaker changeover switches, Crtl) and
('rt2) are from the monostable multivibrator etc. connected to the other end of each input
terminal or the first and second main speaker changeover switches (SW1) and (SW2) The first
and second time-limited 10 circuits, (DI), (D2), when the respective anodes are first and second,
The first and second diodes connected to the output ends of the 艮 jaJ paths (1'L1) and ('1-L2)
are connected to each other at their cathodes. (Q1) is a first transistor for switching connected to
the connection point of each cathode of both diodes (D1) and (1) 2) through the base or the first
resistor (R1), and The second resistor (R2) for bias is connected between the two daughters, and
the collector is connected to another DC current through the third resistor (R3) and connected to
the other] 2), and the emitter is also connected. ing. (Q2) is a second transistor for the relay (4)
謬 71, whose base is connected to the collector of the l @ l transistor ((1), the emitter is
grounded. (R4), (RLo) are current limiting fourth resistances and muting relays connected in
series between the drain of the discharge source (+82) and the collector of the second transistor
(Q2), (D3) is for muting It is a third diode connected in parallel to the relay (RLQ). (IG) is a taquadrant circuit connected to the input terminal or to the connection point of each cathode of
the first diode and second diode (DI), (+) 2, and the fifth resistor (k5) and the electrolytic
capacitor (k5) Co). (CT) and (FF) are Schmitt trigger circuits and Trica flip floating circuits
connected in series to the output end of the injection circuit (IG), (swl) and (SW2) 'each have 7 at
each end. The first and second sub-speaker changeover switches 4 connected to the output end
of the Rifth-Fromb circuit (FF) are respectively interlocked with the 41 and the second king
speaker switch (SW1), (SW2). (Q: (), (Q4) is its base or 粥 6 resistance (R6) and seventh resistance
(R7) via the 1st and 2nd auxiliary speed (5) SWI), (SW2) are relay 3 and 粥 4 transistors
connected to the relay, and their respective emitters are grounded. (C1) and (itB) are respectively
connected between the base of the third transistor (q3) and the ground terminal to form a first
time constant circuit (CRI), a 41 capacitor and a fluoro-eight resistor, (C2), (R9) Are respectively
connected between the base of the fourth transistor (94) and the ground 5 and form the second
time constant circuit (CR2), the second capacitor and the ninth resistor (R1) C) are the third and
fourth Transistors (Q3), (Q4), first and second time constant circuits (CRI), (CR2), sixth and
seventh resistors (R6).
A relay drive circuit configured by (R7), (RIO), (RLl) is a current limiting ... 10 resistor connected
in series between the DC source (+ Bl) and the collector of the third transistor (Q3) The first
speaker switching relay, (D4) is a fourth diode connected in parallel to the first speaker switching
relay (RLI), and (RL2) is the 10th speaker (RIO) and the first speaker switching relay The second
speaker switching relay connected between the connection point with (RLI) and the fourth
transistor ((6) collector of (4), (D5) is parallel to the second speaker switching relay (RL2) One is
a 躬 5 diode. Finally, the flocking of the example will be described with reference to FIGS. 3 and
4. First, the basic operation will be described with reference to FIG. 3. FIG. 71; [32 main speaker
off-contract switch (SWI) or (SW2), when pressed by operating the 1 switch, as shown in the
same INfb +, ('I'l) constant darkness from time (4t) Turn off one pole point (RLO) 'of the rlil
muting relay (R1, 0) to mute the input signal of the power amplifier (AMP) and perform this
muting to perform the C operation. Switch the speaker to one bank. That is, as shown in FIG. l)
From time to time + iil fixed constant darkness ('t)! Rimo 'uLN-fixed ul: 1i (Δl)' 444% Ic + b1t or
second speaker switching relay-(to L1) or (part 1 or 2) IJ :, ('j, (till)' or (Kl-2) 'is turned on, and a
speaker of ph' & is connected to a speaker (no amp (\ MP) j 41). Also, as shown in the same nta
+, (7) 1 r-4 + 鰺 L ♂-· When the main speaker selector switch (SWI) or (sw2) is turned off at
(1′2), the same figure tbl As shown, for a fixed time (A)) from (T2), the muting relay (RLO) is
switched off by turning off the contact (itLo) ', and as shown in tel in the same figure (r2) The
speaker switching relay (RLI) or (RL2) key point (RLI) 'or (RL2) is turned off after a fixed time (atf
elapses) shorter than the muting time (at) from the time the speaker and power amplifier (AMP)
Disconnect from The above operation will be described in more detail with reference to FIG. Now,
when the first loudspeaker switching switch (swl) is turned on as shown in FIG. 2 at (i'1) shown
in FIG. 4 (al) (i'1), the first secondary loudspeaker switching switch (swl) is interlocked And the
third transistor (Q3) and the first speaker switching relay (RL1) are connected to the direct
current I @, the source (+ a1) + MII.
Then, it is applied to a time limit circuit (TLI) of direct current 111F, (I81) or = B1, and in the first
time period tie (TLI), as shown in FIG. 4 b), at ('l'l) The ON signal from the first main speaker OFF
(8) z + 1 switch (swl) is detected to generate a out signal, and the out signal is driven to open for
a fixed time by the out signal, as shown in FIG. T1) Output a positive square wave wave ^ soil of a
fixed time (, 41) width preset from time to time, 弔 1 transistor (Q 1 ) (Or turn on and turn off
transistor 2 of Q2). Once, the muting relay (RLQ) does not have one shoulder, its contact (RLO) is
shifted from on to off, and the Beka signal of the power amplifier (AMP) is muted for a
predetermined time (4 t). On the other hand, the output of the first time limit circuit (rtl) is
marked on the integration circuit (IG), the electrolytic condenser (CO) of the integration circuit
(IG) is charged, and the integration circuit (IG) City 1 ball of waveform as shown in t> td is output,
as shown in nl force 41+ or same INtel, from the time (I) in n mitmit trigger circuit (C 2 l ′ ′)
(乙 t) The waveform is reshaped into a square wave signal that rises after a lapse of time, and as
shown in tfl in the figure, the square wave weight ratio of the square wave output from the
trigger circuit (C'l ') 1) Skin f · S · 1, trigger flip-flip 70 circuit (FF) is driven to output 4 kings of
continuous IE double waveform. Then, the output of the trica flip-flop circuit (FF) is printed on
the base of the third transistor (Q3) with a time delay determined by the first time constant
circuit 4 (CRI),! The transistor @ 3 transistor (Q3) pi neon is energized to the first speaker
switching relay (RLI), and as shown in (g), the contact a of the second speaker switching relay
(RLI) (RLI) 7J The first speaker terminal (01) (4IQ) is connected to the power amplifier (AMP).
Even when the first speaker switching switch (swl) is turned off at (T2), the same operation as at
the above-mentioned turning on is performed, and the muting relay (RLQ) is operated for a
predetermined time (乙). ll11 し て そ の 傍 傍 R R R オ フ オ フ オ フ 、 ス ピ ー カ ス ピ ー カ
ス ピ ー カ ス ピ ー カ ス ピ ー カ 1 speaker switching relay (RLI) l point (L1) or turn off the
difference is the first one When the speaker switching switch (Swl) is off,!
Since the ISI secondary speaker changeover switch (swl) is turned off at the same time, the same
figure (shown in fl (IG added! 2: ”), the contact point (RLI) of the first speaker switching relay
(RLI) is a fixed time (Δ <)! Determined by the first time constant circuit (CRI) from the time of
(T2). It will be turned off later. The operation of turning on the second main speaker changeover
switch (SW2) and turning on the contact (RL2) of the second speaker switching relay (RL2) is
also the same as that of the first main speaker changeover switch (SWI) described above. It is
exactly the same as the operation by turning on. As described below, according to the selection of
the speaker switching device according to this η proposal, there are four main points of the
muting relays connected four on the input side of the power amplifier, and between the output
side of the power amplifier and the plurality of speakers. And a time limit circuit to turn off the 4
屯 of the muting relay by turning on the speaker changeover switch (No. 5 and the off signal at a
fixed time + i5 lul) , The output of the time limit circuit) M'y circuit, the Schmitt trigger circuit,
and the speaker switching relay corresponding to the manually operated speaker selector switch
through the 7-rip 70-to-1 circuit to drive the relay for the speaker switching. (By providing an
11-ray drive circuit), the input signal of the power amplifier can Drives over, for switching the
loudspeaker turned on the contact, it is possible either to prevent the deterioration of the
contacts of the relay, it is possible to prevent the occurrence of ml-frequency noise at the
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jps562693, description
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