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JPH0644295

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH0644295
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
signal input / output device for switching between two input signals.
[0002]
2. Description of the Related Art FIG. 5 shows a circuit diagram of a conventional signal input /
output circuit. Three types of circuits are shown in FIGS. 5A to 5C, each of which is a circuit
diagram of a monaural / stereo input terminal in an audio device such as a mixer.
[0003]
In FIG. 5A, jacks 11 and 12 having switches 11a and 12a internally used for L channel and R
channel are used to switch two input signals of monaural and stereo.
[0004]
First, when a plug is inserted into only the L channel jack 11 and an L channel signal is input, the
switch 11a is opened, and an L channel signal is output from the L terminal, and the switch 12a
of the jack 12 is In the closed state, the L channel signal is distributed to the R terminal to
become a monaural output.
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Also, when a plug is inserted into each of the jacks 11 and 12, the switches 11a and 12a both
open and the L channel signal is sent to the L terminal and the R channel signal is sent to the R
terminal to be a stereo output. is there.
[0005]
In FIG. 5A, when the plug is inserted only into the jack 12 of the R channel, only the R channel
signal is output from the R terminal, but in FIG. 5B, the R channel signal is added in addition to
this. It is also distributed to the L terminal so that monaural output is possible even when a plug
is inserted into any of the jacks 11 and 12.
[0006]
Further, in FIG. 5C, there is a circuit for selecting the destination of the input signal in the audio
equipment such as the mixer, and the L terminal and R in FIG. 5A (may be FIG. 5B). In addition to
the terminals, this circuit is a circuit for sending signals to, for example, the external terminals
AUX1 and AUX2.
That is, the L, R terminals and the AUX 1 and 2 terminals are switched by the assignment switch
13. The assign switch 13 is usually provided on an operation panel surface such as a mixer.
[0007]
However, when the assignment switch 13 is to be provided in a small mixer or the like, there is
no space for providing the assignment switch 13 because the surface of the operation panel is
small. There is a problem that you can not
[0008]
Therefore, the present invention has been made in view of the above problems, and an object of
the present invention is to provide a signal input circuit that distributes an input signal to a
plurality of terminals in a small space.
[0009]
The above problem is solved by providing a single set of switching contacts at first and second
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2
input portions for inputting two external input signals through respective connection members. A
signal input / output device provided internally with a first switching unit switched by the
connection member and connected so as to distribute the input signal to the corresponding two
systems of the first and second lines; At least one of the first and second input parts has a
plurality of sets of switching contacts instead of the first switching part, and the first and second
lines and the other according to the connection member This problem is solved by the
configuration in which a second switching unit connected so as to distribute the input signal is
internally provided.
[0010]
As described above, in at least one of the first and second input parts, the second switching part
has a plurality of switching contacts instead of the first switching part having a single set of
switching contacts. A switching unit is provided internally.
[0011]
That is, the first switching unit installed in the conventional first and second input units
distributes only two systems of lines for two input signals for a single set of switching contacts.
However, by including a second switching unit having a plurality of switching contacts, the input
signal can be distributed to other lines besides the first and second lines.
[0012]
That is, by providing the second switching unit in the input unit, it is not necessary to provide an
assign switch, and the space can be reduced, and the apparatus can be miniaturized.
[0013]
DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows a circuit diagram of an
embodiment of the present invention.
FIG. 1 shows, for example, a signal input / output device 21 used in a mixer, wherein a plug
connection unit 22 of an L channel which is a first input unit and a plug connection unit 23 of an
R channel which is a second input unit are The switch 24 which is a second switching unit and
the switch 25 which is a first switching unit are internally provided at the back of the plug
connection units 22 and 23, which are grounded through the terminals 221 and 231,
respectively.
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The switches 24 and 25 operate by inserting and removing a plug (see FIG. 2) which is a
connecting member.
The switch 24 has two sets of terminals (switching contacts) 242, 243 and 243, 244, and the
switch 25 has one set of terminals (switching contacts) 251, 252.
[0014]
One end 24a of the switch 24 on the L channel side is connected to the volume 26 constituted by
the sliding resistor 26a via the terminal 241 and the terminal 251 of the switch 25 on the R
channel side, and the other end of the sliding resistor 26a Is grounded.
The sliding portion 26a1 of the sliding resistance 26a is connected to the output terminal 28 of
the L channel line which is the first line via the resistance 27.
[0015]
The other end 24b of the switch 24 between the L channels is connected to the sliding portion
26b1 of the R channel side sliding resistance (constituting the volume 26) 26b via a terminal
243.
Further, one contact on the other end 24 b side of the L channel side switch 24 is connected to
the output terminal 30 of the Q external output line from the terminal 242 through the resistor
29, and the other contact is from the terminal 244 via the resistor 31. It is connected to the
output terminal 32 of the R channel line which is the second line.
The switch 25 on the R channel side is connected to one end of the sliding resistance 26b
through the terminal 252, and the other end of the sliding resistance 26b is grounded.
[0016]
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Note that 24c interposed between the one end 24a and the other end 24b of the switch 24 is an
insulator
[0017]
Here, FIG. 2 shows a diagram for explaining the contact operation of FIG.
2A and 2B show the contact operation of the switch 24, and FIGS. 2C and 2D show the contact
operation of the switch 25.
[0018]
2A shows a state in which the plug 33a is not inserted into the plug connection portion 22, the
other end 24b of the switch 24 is in contact with the terminal 242 and not in contact with the
terminal 244. When the plug 33a is inserted into the plug connection portion 22 as shown in
FIG. 2B, the other end 24b of the switch 24 is not in contact with the terminal 242 and is in
contact with the terminal 244.
[0019]
Further, FIG. 2C shows a state in which the plug 33b is not inserted into the plug connection
portion 23. The terminal 252 side of the switch 25 is in contact with the terminal 251 side, as
shown in FIG. When the plug 33b is inserted into the connector 251, the terminal 251 is not in
contact with the terminal 251.
[0020]
Therefore, FIG. 3 shows a diagram for explaining the flow of signals in FIG.
FIG. 3A shows the case where the plug 33a is inserted only in the plug connection portion 22.
The L channel signal is first output from the output terminal 28 of the L channel line through the
sliding resistance 26a and the resistance 27 from the terminal 241. Be done.
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[0021]
In addition, the L channel signal passes through the sliding resistance 26b through the terminals
251 and 252 of the switch 25 on the R channel side from the terminal 241, and further passes
through the resistor 31 through the terminals 243 and 244 of the switch 24 on the L channel
side. It is output from the output terminal 32 of the R channel line.
[0022]
That is, the L channel signal is output to the L channel line and the R channel line to be a
monaural output.
[0023]
Next, in FIG. 3B, when the plug 33b is inserted only into the plug connection portion 23 of the R
channel, output is made only from the Q line.
That is, the R (Q) channel signal passes through the sliding resistor 26 b through the terminal
252 of the switch 25, passes through the resistor 29 through the terminals 243 and 242 of the
switch 24 on the L channel side, and passes through the output terminal 30 of the Q line. Output.
[0024]
Further, FIG. 3C shows a case where the plugs 33a and 33b are inserted into both of the plug
connections 22 and 23 of the L and R channels.
First, the L channel signal passes through the sliding resistor 26 a through the terminal 241 of
the switch 24 and is output from the output terminal 28 of the L channel line through the
resistor 27. Also, the R channel signal passes through the sliding resistor 26 b through the
terminal 252 of the switch 25, passes through the resistor 31 through the terminals 243 and
244 of the switch 24, and exits from the output terminal 32 of the R channel line.
[0025]
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That is, the L channel signal is output from the output terminal 28 of the L channel line, and the
R channel signal is output from the output terminal 32 of the R channel line and output in stereo.
[0026]
The plug connector 22 may be for the R (MONO) channel, and the plug connector may be for the
L (Q) channel.
[0027]
FIG. 4 shows a circuit diagram of another embodiment of the present invention.
FIG. 4A shows that the plug connection portion 23 on the R channel side in FIG. 1 is provided
with a switch 25A having a plurality of sets of switching contacts similar to the switch 24. 221
and 231 are connected to one end of the sliding resistances 26a and 26b, and
[0028]
The terminal 241 of the switch 24 is connected to the other end of the sliding resistance 26a,
and the sliding portion 26a1 is connected to the terminal 25A3 of the switch 25A.
The terminal 242 is connected to the output terminal 30 (the Q line in FIG. 1) of the external line
(AUX2) through the resistor 29. The terminal 243 is connected to the sliding portion 26b1 of the
sliding resistance 26b, and the other end of the sliding resistance 26b is connected to the
terminal 25A1. The terminal 244 is connected to the output terminal 32 of the R channel line via
the resistor 31.
[0029]
On the other hand, the terminal 25A2 of the switch 25 is connected to the output terminal 35 of
the external line (AUX1) through the resistor 34, and the terminal 25A4 is connected to the
output terminal 28 of the L channel line through the resistor 27.
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[0030]
In such a signal input device 21 the plug connection 22 is for the L channel signal (external line
AUX1) and the plug connection 23 is for the R channel signal (external line AUX2).
That is, when the plug 33a is inserted only into the plug connection portion 22, the L channel
signal is output from the output terminal 35 of the external line AUX1, and when the plug 33b is
inserted only into the plug connection portion 23, the R channel signal Is output from the output
terminal 30 of the external line AUX2. When the plugs 33a and 33b are inserted into both of the
plug connectors 22 and 23, the L and R channel signals are output from the output terminal 28
of the L channel line and the output terminal 32 of the R channel line, respectively. Will be
output
[0031]
4B shows a short circuit of the terminal 242 of the switch 24 and the terminal 24A2 of the
switch 25 in FIG. 4A.
[0032]
According to this, when the plug 33a is inserted only into the plug connection 22 of the L
channel or when the plug 33b is inserted only into the plug connection 23 of the R channel, the
signal of the L channel or R channel is It is outputted from the output terminal 30 of the external
line AUX.
[0033]
When the plugs 33a and 33b are inserted into both of the plug connection portions 22 and 23,
the L channel signal is output from the L output terminal 28, and the R channel signal is output
from the R output terminal 32, It becomes a stereo output between the output terminals 28 and
32.
[0034]
As described above, since the assign function can be provided without providing an expensive
assign switch as in the prior art, the input terminal can be effectively used, and the cost reduction
and the downsizing of the device by a small space are realized. Can be
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[0035]
Although the above embodiment shows the case where the invention is applied to a mixer, the
invention is not limited to this, and the invention can be applied to an apparatus for distributing
input signals of two systems to more output terminals.
[0036]
As described above, according to the present invention, a second switching unit having a plurality
of sets of switching contacts is provided in at least one of the first and second input units. It
becomes possible to distribute an input signal to two or more input signals to the output line
more than this, and it is possible to achieve downsizing of the device and cost reduction.
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