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JPS5327801

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5327801
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram of a conventional mode switching
circuit. FIG. 2a is a mode switching circuit diagram of the present invention and is a circuit
diagram when it is set to a stereonormal position. FIG. 2b is a mode switching circuit diagram of
the present invention when the stereo reverse position is set. FIG. 2C is a mode switching circuit
diagram of the present invention, which is a circuit diagram when it is set to seven aural
positions. FIG. 3 shows another rotary switch type, and FIG. 4a is a mode switching circuit
diagram of another embodiment of the present invention, which is a circuit diagram when it is
set to the stereonormal position. FIG. 4b is a mode switching circuit diagram of another
embodiment of the present invention when the stereo reverse position is set. FIG. 4c is a mode
switching circuit diagram of another embodiment of the present invention, which is a circuit
diagram when it is set to seven aural positions. A one output line, B; the other output line, 1 to
20: contacts, 27, 28, 29 and 30; contacts.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement
of a mode switching circuit used for a stereo amplifier or the like. An example of a mode
switching circuit conventionally used for a stereo amplifier etc. is shown in FIG. As shown in FIG.
1, the main part of the mode switching circuit is constituted by a rotary switch of 4 circuits and 8
contacts, for example, the left audio signal line is connected to the contact 2.3 and 10 and the
right audio signal line R is a contact Connect to 1.11 and 12 and common contacts 13 and 14 are
shorted, 11) ?7? Further, the common contact 16 is connected to the contact 6 to form the
other output line B. The movable pieces of the common contact 18, 4. 4. 15. 16 interlock. In the
conventional moo 1 switching circuit configured as described above, the contacts 3.6 and 12 are
monaural R contacts, the contacts 2.5 and 11 are stereonormal contacts, and the contacts 1, 4
and lo are stereo reverse. It is a contact point. As is apparent from the figure, in the monaural
position in which common contacts 3, 3, 4 and 16 are connected to contacts 3.6 and 12,
respectively, output lines A and B have a total of a thousand naurals of the sum of the left and
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right audio signals. Output is available. In the stereo-normal position in which the common
contacts 13, 4 and 16 are connected to the contacts 2.5 and 11, respectively, the left audio signal
is output to the output line A and the right audio signal is output to the output line B. Stereo
reverse 1'2) иии и 1-where the common contacts 13.14 and 16 are connected to the contacts 1.4
and IO respectively и и и и 1-the right audio signal on the output line A, the left audio signal on the
output line B Is output. Also, a circuit similar to the circuit illustrated in FIG. 1 is also used, but
regardless of the type of the circuit, the audio passing line at the time of stereo reverse or seven
aurals is adjacent to the audio signal passing line at the time of stereonormal. Since C contacts
are arranged and contacts to which the left side audio signal and the right side sound are applied
are adjacent to each other, there is a drawback that crosstalk occurs between switch circuit
contacts due to stray capacitance between the contacts and the like. In addition, there is also a
mode switching circuit in which a means for shielding the contact points by a shield plate is
provided to prevent this, but in this case the switch becomes complicated and expensive. The
present invention has been considered in view of the above, and it is an object of the present
invention to provide a mote switching circuit with less crosstalk between each contact without
adding a plate. According to the present invention, this object is achieved by the switch contact to
which the left audio signal is applied and the right audio signal +8+: 1.
-1: A switch contact to which a left audio signal is applied and a switch to which a right audio
signal is applied by connecting at least one contact interposed between the switch contact to be
applied and a ground contact state A contact point of ground potential is present between the
contacts and is achieved by providing a shielding effect to reduce crosstalk. Embodiments of the
present invention will be described with reference to the drawings. FIGS. 2a, 2b, and 2c are
embodiments of the use of the rotary switch in the moat switching circuit of the present
invention. The rotary switch used in this embodiment is the same 4-circuit 3-contact as in the
case of FIG. The left Illg voice line connects to the common contact 18. The right audio signal line
R is connected to the contacts 8.9 and 10. The contacts 2.3.4 and 6 are shorted to each other and
serve as one output line A. The contact 12 and the common contact 5 are short-circuited to form
the other output line B. Contacts l, u and 7 are shorted. The common contacts 14 and 16 are
shorted and the contact 1 is grounded. With the mode switching circuit configured as above,
when the rotary switch is set to stereo and normal position, ? '4)! The common contacts 13,
4.15 and 16 are in contact with the contacts 2.5.8 and 11, respectively, and the left audio signal
is output to one output line A through the common contact 13 and the contact 2, right 911 The
audio signal is output to the other output line B through the contact 8 and the common contact
15. The common contacts 14 and 16 contact the contacts 5 and 11, respectively, and the
contacts 1.5.7.11 and the common contacts 14.16 are grounded. Contacts 2.8.4 and 6 receive
the left audio signal, and contacts 8.9, IO and 12 and the common contact 15 receive the right
audio signal. That is, there are two parts where the contact to which the left audio signal is
applied and the contact to which the right audio signal is applied are opposed to each other at
the contacts 2 and 12 and the contacts 6 and 8. A contact 1 is interposed between the contacts 2
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and 12 and a contact 7 is interposed between the contacts 6 and 8 and grounded. A common
contact 14.16 grounded is interposed between the common contact 13 to which the left audio
signal is applied and the common contact 15 to which the right audio signal is applied. Fig. 2b
shows the case where the rotary switch is set to the position of ? 1 ((5) ? ? ? ? ? ? ? ?
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?? ?? ?? ?? ?
? ? ? ? ? ? ? ? 4.7 4.7 4.7 The left audio signal is output to the output line B through the
common contacts 13, contacts 1 and 7, and the common contact 15, and the right audio signal is
output to the output line A through the contacts 10 and 16 and 14, the contact 4. It is output.
This is interchanged in the relationship between the case of stereonormal and the output, and is
the same operation as a normal mode switching circuit. The second setting with the rotary switch
set to the mono position (in the case shown, common contacts 18.14.15 and 16 contact contacts
3.6.9 and 12, respectively, and the left audio signal is common contact 13, contact 3 to the
output line A, and further to the output line B through the contact 6, the common finger 14 and
16, and the contact 12; The right audio signal is output to the output line B through the contact 9
and the common contact 15, and further to the output line A through the contact 12, the
common contacts 16 and 14, and the contact 6. This is also the same operation as a normal mote
switching circuit. 3, 6 'and above The case of the rotary switch of the same type as the case of
the description of the conventional embodiment has been described. Next, the case where the
rotary switch is of the type shown in FIG. 3 will be described. The rotary switch shown in FIG. 3
has the same configuration as that of the rotary switch shown in FIGS. 1 and 2a, 2b and 2c, and
has four contacts and three contacts. The two parts are equally spaced from one another to form
contacts 1 to 12 respectively. On the inner circumference, common contacts 13 to 16 are formed
in four equal lengths corresponding to the three contacts of the contacts at a constant distance
from each other. For example, the common contact 13 corresponds to the contacts 1 to 3, the
common contact 14 corresponds to the contacts 4 to 6, the common contact 15, 15 to the
contacts 7 to 9, and the common contact 16 to the contacts 10 to 2, respectively. The first
contact 27.28.2 q and the first contact 27 are configured such that the connection between the
common contact and the contact corresponding to the common contact is sequentially switched
by switching between the rotary, the snow correction, and the one switch. For example, in the
case of stereo normal position 5), (7) 2 \ ?1, common contact 13 is by contact 2 and contact 27,
common contact 14 is by contact 5 and contact 28, and common contact 15 is contact 8 and
contact At 29, the common contact 16 is connected by the contact 11 and the contact 30,
respectively. Similarly, in the stereo reverse position, the contacts 27.28.29 and 80 bring the
common contacts 18, 4.15 and 16 into contact with the contacts 1.4.7 and IO, respectively.
Furthermore, in the monarch position, contacts 27.2829 and 30 bring each common contact 13,
4.15 and 16 into contact with contacts 3.6.9 and 12, respectively. Similarly to the rotary switch
of this type shown in FIGS. 2a, b and c, the left audio signal line is connected to the common
contact 13, the right audio signal line is connected to the contacts 3q and IO, and contacts 2.3.4.
And 6 are mutually shorted to form one output line, contact 12 and common contact 15 are
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shorted to be the other output line, contact] co and 7 are mutually shorted, and common contacts
4 and 16 are shorted, The contact 11 is grounded.
(8) 'for. When connected in this way, the mode switching circuit is operated in exactly the same
manner as in the case shown in the J2a, b and C diagrams at each of the stereo normal, stereo
reverse and mono rotary switch positions. 4a, b and C show other embodiments of the present
invention. In this case, a slide switch is used. As shown in the figure, the slide switch is divided
into contact points 1 to 56-10.11.1-15.16-2004 circuits. The left audio signal line is connected to
contacts 2.3 and 4. The contact 1 is short-circuited to the contact 12 and connected to one
output line A. The right audio signal line R is connected to the contact 20. The contacts 7.9.17
and 18 are short-circuited and connected to the other output line H. On the other hand, the
contacts 1 and 5, the contacts 6 and the IO1 contacts 11 and 15, and the contacts 16 and 20 are
shorted respectively. Contacts 4.8 and 19 are shorted. The contact 13 is grounded. (9) Wow. In
the moat switching circuit configured as described above, if the slide switch is set to the position
of no one or two as shown in FIG. 4a, contacts 1 and 3, contacts 18 and 20, and contacts 11 13
and 8 are shorted respectively. Ru. Thus, the left audio signal is output to one output line A
through contacts 3 and l, and the right audio signal is output to the other output line B through
contacts 20 and 18. At this time, the contacts 4.6.8.10.11, 13.15 and 19 are grounded, and the
left audio signal is applied to the contacts 1, 2.3.5. 18 and 20 are subjected to the right-hand
sound 1 lane angle signal X. As a result, two opposing portions of the contacts to which the left
side audio signal and the lower right side 1 C audio signal are applied are the contact points 5
and 7 and the contact points 14 and 16. A contact 6 is interposed between the contacts 5 and 7,
a contact 15 is interposed between the contacts 14 and 16, and the contacts 6 and 15 are
grounded. Next, as shown in FIG. 4b, the slide switch l- ? P \. When the '-' (to) ? is set to the
stereo reverse position, the contacts 1 and 4, the contacts 19 and 20, and the contacts 11 and
14, 9 and 10 are shorted respectively. Thus, the left audio signal is output to the other output
line B through contacts 14 and 9, and the right audio 18 is output to one output line A through
contacts 20.19.4 and l. This is exactly the reverse of the case of FIG. 3a, and is the same
operation as the mote switching circuit at the time of normal stereo reverse.
As shown in FIG. 4c, when the slide switch is set to the monal position, the contacts 1 and 2, the
contacts 7 and 10, 11 and 12. And contacts 7 and 20 are shorted respectively. Therefore, the left
audio signal is output to the output line A through the contacts 2 and 3 and is output to the
output line B through the contacts 12.10 and 7. The right audio signal is output to the output
line B through the contacts 20 and 17 and is output to the output line A through the contacts 7
and 12. This is also the same operation as a normal mode switching circuit. (111.) As described
above, according to the present invention, when the switch of the mode switching circuit is set to
the stereonormal position, the contact point of the left audio signal and the contact of the contact
of the right 1?] 1 audio signal are opposite to each other. A contact point grounded at a point is
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interposed, and a round effect can be exerted to reduce crosstalk. Also, because it is possible to
use a conventional switch, there is no special price increase.
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