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JPS4987301

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DESCRIPTION JPS4987301
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a connection diagram showing an example of a
manual mixing circuit according to the present invention, and FIGS. 2 and 3 are connection
diagrams showing other embodiments. 1L and 1R are signal transmission lines respectively, 2L,
8L, 8R and 2R are signal sources such as microphones, 3L and 3R are output terminals, 4L, 10L,
10R and 4R are respective gain control of amplifiers etc. Circuits 5, 6.7 are switch means, 9L, 9R,
12L, 12R, 13L and 13R are resistors respectively. Fig. 1-1-49-87301 (2 ') Fig. 2 Fig. 3-21
Detailed description of the invention: L (left) and R (right) microphones and a plurality of
microphones (for convenience referred to as auxiliary microphones) are distributed, and a
constant signal is collected by these auxiliary microphones. Transmission of the respective
signals relating to the on- and R-microphones @ 'i @ PI] It is often practiced to separate the Lchannel and R-channel signal transmission lines into a J-like manner to pick up the stereo signal.
The present invention relates to an input microphone circuit suitable for such a case, and
provides a yield level for L channel and R channel upon switching for supplying signals from the
auxiliary microphones to respective transmission resistance paths. In the case of the change of
the order number,) is considered to be 4 friends. First of all, the input mixing by this invention
about f1 figure, ...! 18 all explained. In the figure, IL and IR are the abbreviations of L (left) and R
(stone) channel signals respectively, 2L and 2R are L and R microphones for L and R channel
signals respectively, 3L and 3R, L and R respectively. The output terminals of the B-channel
signal, 4L and 4R, are service control circuits (amplifiers or attenuators) for the respective
microphones 2L and zR. In this example, in addition to the left and right microphones 2L and 2R
described above, two microphones (2) on 8L and 8B are provided as an aid! +, 10L and IOR are
the respective pre-gain-one i ranks (example 1 is a spanner). In the prior art, there are provided
switch hands N + 51 + 61i (7) of the second, third and third years. Each of the switch means +
51Ill and 17+ is mechanically interlocked with the TL, and the switch means 11j1 of O1 is a
switch means (6) of the switch 2L from the switches 6L and 6R by two switches 5L and 5R. The
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switch means (7) of Y; 4'3 are formed of switches 7L and 7R and 411 respectively. The switches
5L and 5R are not interlocked with each other. The same applies to the switch means +6+ and
(7). Further, in the switching state of the switch 1, the signal from the auxiliary microphone 8L is
supplied to the left channel transmission line 1LK, and the signal from the auxiliary microphone
8R is embedded to indicate the state of PD being supplied to none. The switch means (5) is
switched to supply a signal from the Shinsuke microphone 8L to a signal transmission line such
as a signal transmission line @nIL, and the switch means (5) is connected to the switch 2 (3) By
means of the switch hand (3) stage 161 and (71, another signal transmission line, for example
the right channel signal transmission @ @ IR is made to be grounded via the resistor t2R, and
further, in the state of f) Signal is supplied to the other signal transmission path (that is, this pair
is IR) (when the switch 5R is switched, the ground of the signal transmission line IL by the switch
12H is released) In the same manner, the signals from the microphones 2L and 8L ↓ 9 are given
to the output 1 3LK and the signals from the microphone 2R are given to the output inner 3R.
4L, when the output of from IQL and 4R has a Lee Hanjo into equal zeta, each output 1 child 31.
And 13H are connected respectively to the output @ of each amplifier so that the levels from the
respective microphones 2L, 8L) ltU 2 R given to 3H and 3H become equal to one another, and
their resistance values are respectively It is selected equal to that of the unit i2H (and (1 is equal
to V)). Since the right channel signal transmission line IRfm is constructed symmetrically with
the% transmission 1s path 1L, the corresponding parts have the same code (L and B of the 41 fix
are substituted for R and LK, and the description is for Omit. In this case, the abrasive pile values
of the rail piles 89R113R and 12L in this case are also selected to be the same value as that of
the trowel t2R or the like described above. The operation t is described above. The output
impedance of each amplifier is considered to be small and almost zero. In Fig. 1, the output from
amplifier 4L is divided by resistors 13L and 9LK, and the output from 1v1 amplifier 10L is also 6
so that the% output is applied to output terminal 3L. And the output of the issue is obtained as
the output 1 child 3 LKa. In the amplifier 4R, the output is transmitted to the output terminal 3R
in the form of a resistor 131 (and 12R) since the IR is grounded through the resistor 12R-switch
6L-switch 7k. When the switches 5R, 6R, 7R1 are switched in the state shown in FIG. 5, the
output of the amplifier 10R is applied to the terminal 3RK, and the grounding by the resistor 12B
is released. Therefore, the level of the output from each microphone is equal to the output
terminals 3L and 3RK, and fL. (5) If only switches 5L, 6L and 7L are turned off, the output from
amplifier 4L is output terminal 3LK, and the output from amplifier 4R is output terminal 3R. Each
is supplied at a very low level. As described above, according to the present invention, equal
output can always be obtained regardless of any switching state of the switch means (51 + 61 f)
with respect to the left channel and the right channel. Therefore, as shown in the figure, stereo
collection f? Is it the output from the microphone 8L to the insertion being done? Even if the
level of the microphone 2L is reciprocated when being inserted into or removed from the feeding
line, the level from the microphone 2R also changes accordingly, so that the left-right balance of
the stereo sound is not horizontal. Of course, when the outputs from microphones 8L and 8R are
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not supplied to lines IL and IRK, the output lines of microphones 2LN and 2R? The respective
output terminals 3L and 3RK are supplied with almost no loss.
Note that 14L and 14R are resistors, respectively, and their resistance values are selected as the
output values of amplifier 4L and 4) 1 (the 61 ounces of '1' ('5F is V, <) . 2 years old! The
example of the pot is shown [2, the same group 4 in the corresponding part with 1 year old! The
explanation is omitted. In this example, each switch has the role of + 5 + H6 + and (when the
switch is switched to the center contact, the outputs from the coping microphones 8L and 8R are
further used, as compared with the small gold in FIG. Each is supplied to both lines @zL and IH.
Also in this case, the resistance value between the respective fences and piles is predicted to be
in the form of a circle and in the form of a cylinder. Now, looking from the output terminal 3L for
the state of FIG. 2, this is respectively connected to the amplifier 4L through the resistor 13L, to
the amplifier 10L through the resistor 9L2, and to the amplifier 10R through the resistor 12Lswitch 6R. Since it is connected, the output addressed to each amplifier 4L, 10L, 10R will be
supplied with the output terminal 3LK, while when viewed from the output terminal 3B, this will
be the amplifier 4RK, through the resistor 13R. It is connected to the amplifier 10H through the
fence piler 9R-switch 5R1-, and is grounded through the resistor 12R-switch 6L-resistor 14Lswitch 7R. Therefore, the outputs (7) of the amplifier 4B and the IOR are respectively h and
obtained by the output oyster 3R, and the balance of the left and right channels is maintained.
The same applies to the case where the switches 5L, 6L and 7L are at the centers of the three
contacts, and the switches sR, 6R and 7R are switched to the lowest contacts in the drawing. Also,
if each switch is switched to the central contact respectively, if looking at the channel IL from the
output terminal 3L, in addition to the amplifier 4L and IOL, the amplifier is further connected
through the resistor 12L-switch 6R. It will be connected to 10R, so that the output terminal 3L
will be supplied with the respective% output of each amplification i4L, IOL and IOR, which is
uniform for the right channel IR. It is to be noted that, in these channels IL and IR, a prose
identical to each other in history is the same even if a signal is connected in history. FIG. 3 shows
still another embodiment, and the parts corresponding to those in FIG. 1 and FIG. In this
embodiment, microphones 8L 'and 8R' 'are further provided to the embodiment of FIG. 2, and
accordingly, amplifiers +81 10L' and 10R 'switches 5L', 6L ', 7L', 5R 'respectively. In the case
where 6R 'and 7R' are provided, the operation and effect are the same as in the case described
above, so the detailed description thereof is omitted.
According to the present invention described above, the switch (51 f 6 tm can be switched at all
times regardless of how the switch is switched, so that it can perform an effective operation as a
resistance mixer. Has a feature that can Although the case of mixing the signals from the
plurality of microphones has been described above, the same effect t-m4 can be waited without
being limited to this microphone, even if it is considered as a signal rod. Also, although the
number is not limited, when the signal transmission line is n (2 in the embodiment), the present
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device selects m (m) n signals − and mixes them in the signal transmission line by Ichikawa. is
there.
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