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JPS521046

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DESCRIPTION JPS521046
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a circuit diagram of one embodiment of
the circuit of the present invention. la, lb · · · · · · · · · · Input terminal, 4.5.6 · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · variable resistor, 9
· · · · · · · · · · · · · ... output terminal. −107−
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mixing circuit,
and more specifically, a desired mixing ratio when mixing a reproduction signal with another
signal at the time of recording with a tape recorder or at the time of recording with a tape
recorder. It is an object of the present invention to provide a mixing circuit which can be used
also for adjusting the sound quality according to a particularly desired time, according to when
desired, a variable resistor for Kfi overpowering, thereby making the cabin of a device such as a
tape recorder, easy in operation etc. . In the following, together with the drawings, a schematic
diagram of one embodiment of the circuit according to the invention will be shown in the form
Wtt-iI12. In the figure, la and lb are input terminals to which a first input signal and a second
input signal are supplied, respectively, and amplifiers 2a and 2b. To the movable contact piece ('3
mon terminal) of the changeover switch 4 and the fixed contact a (normal / connect itiko) of the
changeover switch 5 via resistance aa, 3bt-! l! It is being deceived. The changeover switches 4
and 5 have fixed contacts a and bt, as in the case of the changeover switch 6 described later, and
are configured to be interlocked and switched together. Further, 7 is a mixing ratio-Toyokawa's
switchable switch, and the switch switch (2), the 'f valve to the switch 4 is connected between the
fixed contact a of the switch 4 and the switch switch 50 movable contact piece. The slider of the
variable resistor 7 is connected to one end of the impedance element 9, while connected to the
changeover switch 60 fixed contact a. The tin tin of the impedance element 9 is connected to the
connection point between the movable contact of the changeover switch 6 and the input side of
the paddle wheel 10. The movable contact piece of the changeover switch 4 is m-turned to the
fixed contact b (normal degree open terminal) of the changeover switch 6 through the resistor 8
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and the fixed contact of the changeover switch 4 is the fixed contact aK of the changeover switch
5 It is connected. The fixed contact of the changeover switch 5 is grounded. In the circuit
configured as described above, the movable contacts of the changeover switches 4, 5 and 6 are
normally closed to the fixed contacts a (normal connect insulators) 111 [0] by this, from the
input terminal 1a This first input signal and the input signal of -2 coming from the input terminal
1b are mixed at the mixing ratio determined by the position of the slider 7v of the variable
resistor # 7. The slide switch 7v passes (3)-), the changeover switch 6 and the amplifier 10, and
the MR 9 is output from the output terminal 11. The mixing ratio is, for example, that the first
input signal is smaller with respect to the input signal of @ 2 as the variable resistor 70 slider 7v
is positioned above the middle point position of the variable resistor 7 in the figure. On the other
hand, the second input signal becomes smaller relative to the first input signal as it is positioned
lower than the midpoint position.
As described above, in the embodiment in which the variable resistor 7 is used to adjust the
mixing ratio of the first and second input signals, the impedance element 9 is shorted by the
changeover switch 6 so that There is no influence. The circuit of the present invention is such
that the variable resistor 7 can be used also for volume control. That is, the movable contact
pieces of the changeover switches 4, 5 and 6 are respectively switched in connection with the
fixed contacts all and pb *. As a result, the resistor 3a of the first input signal transmission line
and the resistor 3b of the second input signal transmission line are directly connected via the
changeover switch 4, and further, the resistor 10 and the changeover switch 6 The input is 11
kmf (4) 1:77. ハ)る。 The resistor 7 has its one end opened to 10,000, and its low current is
grounded via the changeover switch 5 to its L1 L1 history valve, and its 7 Vt impedance element
9 is closed. The circuit Q frequency a special 1! E will be changed. The No. 1 and No. 20
Humanities ia are mixed in a circle added by the ratio of the resistors 3a and 3b by the
changeover switch 4 and then passed through the resistor 8 & the changeover switch 6 and 瑠 暢
-10. It can be supplied to Here, the resistance of 8 billion is set to a value such that the 1 w &
attenuation weight of the changeover precept of the changeover switches 4.5 and 6 is equal to
one set, so that the father of the sound box is brought out when switching. There is no. By the
sliding of the slider 7v, the mixture li is given the desired frequency a% while keeping the
coupling ratio constant, and the naw straw quality is adjusted and it is output from the output
terminal 11 at -9. Note that it is also possible to configure the interlock switch switches 4.5 and 6
that are interlocked to switch in conjunction with the switch 11 and the switch 7 and the mass
resistance 7 of the variable resistor a7 to interlock with each other. In this case, it is possible to
easily perform two operations of mixing ratio adjustment and sound quality adjustment with a
single knob. As described above, the mixing circuit according to the present invention is
connected between the input signal transmission path of 纂 l and the second input signal
transmission path through the mixing ratio adjustment variable resistor, and the sliding of the
variable resistor is performed. In a mixing circuit for guiding a mixed signal of the first and
second input signals from an actuator to an output terminal, an impedance element inserted and
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connected between the output terminal and a slider, and the first input signal transmission
Switching the path between one end of the variable resistor and the second input signal
transmission path, and switching the other end of the variable resistor between the second input
signal transmission path and the ground The first input signal transmission via the second
selector switch interlocked with the first selector switch to be connected, the slider and the
resistor having a predetermined resistance value so as to short the output element to the
impedance element The first and second changeover switches Third for you to and a changeover
switch, sound ilI to the mixed ratio adjusting variable resistor for switching and connecting in
conjunction with!
One function can be combined (6) 9 so that one town can keep the mixing ratio constant while
keeping the mixing ratio constant, so it is possible to use one # quality IIII of No. 11 mixing, so
for example a small tape recorder True-in the space t-Xj I, the resistance of the power dissipation
resistance resistance to the first input signal transmission line and the power terminal with the
above iI2 third sharp switch Therefore, it is possible to eliminate the change in the volume of the
switch f and his single-force mixing No. 16, and interlock the 1st to 1g 3 selector switches
interlocked with the variable resistor O slider. 0, with the knob of 混合-, mixing ratio − 贅 and 贅
adjustment can be performed as desired, and further, the adjustment operation can be performed
extremely easily, etc. 0
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