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JPS515281

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DESCRIPTION JPS515281
■ Balance position display device ■ Japanese Patent Application No. 49-118939 [phase]
Application No. 45 (1970) June 4 [phase] Japanese Patent Application No. 49-62666 division 0
inventor Saito Tadao Asaka 6 14 Abe Hamazaki Line ■ Applicants Sony Corporation Tokyo parts
for the district Kita goods for six 7 35 [phase] agent patent attorney Atsushi Ito
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a route diagram showing a magnetic track on a
magnetic tape, FIG. 2 is a plan view showing the arrangement of speakers for performing 4channel stereo reproduction, and FIG. 3 is a display device according to the present invention. 4
is a sectional view of the main part of FIG. 1 and FIG. 5 is a system diagram showing an example
of a 4-channel stereo reproduction apparatus.
DETAILED DESCRIPTION OF THE INVENTION The present invention seeks to provide an
indication of the volume balance position of a four channel stereo device. As shown in FIG. 1,
when the four magnetic tracks T1 to T4 formed on the magnetic tape T are made into first,
second, third and fourth tracks sequentially from the top, the usual four tracks and two channels
are used. If the magnetic tape T is transported in the positive direction, the left and right signals
are recorded in stereo on the first and third tracks TI, T, and some b are reproduced in stereo. On
the other hand, in the case where the amorous tape T is transported in the opposite direction, the
right and left signals are recorded in stereo on the second and fourth tracks T, T, or they are
reproduced in stereo. On the other hand, a tapencoder has been proposed which performs fourchannel stereo recording and reproduction by the signals of the first to fourth channels by
simultaneously using four tracks T1 to T1 [1111111]. In this case, as shown in FIG. 2, the front
left, rear left, front right and rear right of the listener M are first, second, third and fourth
speakers S1, S2. S3. s4 is arranged, and the respective reproduction signals from the tracks T1 to
T4 are reproduced from the speakers S4). That is, on the tracks T and T3, the signals on the front
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left and front right are recorded at the same time as the tracks T2. Signals at the rear left and
rear right are recorded at T4, and these are speakers S and -S. Played by. The present invention is
intended to provide a display device that displays the balanced positions of the left and right and
front and back volumes of such a 2-channel 4-channel JZ stereo signal. An example of the
present invention will be described below with reference to FIGS. In FIGS. 3 and 4, IX and IY
indicate slide type variable resistors (slide volumes) for adjusting the volume balance between
left and right and front and back respectively, and these variable resistors IX and IY are for
example the substrate 2 It is attached to the substrate 2 along two orthogonal sides of the
substantially square hole 2a, that is, it is attached to the substrate 2 so that the operation
directions of the control levers (knobs) 3X and 3Y of the resistors IX and IY are orthogonal to
each other. It is attached. And lever 3X, 3Y arm (arm body) 4X. The elongated holes 5X are
attached so that 4Y are orthogonal to each other and formed in the arms 4X and 4Y respectively.
At the intersection of 5Y, the holder 6 has the cylindrical portion 6A penetrating the long holes
5X and 5Y, and the flange 6B and 60 provided on the outer periphery of the cylindrical portion
6A is the arm 4X. It is attached to hold 4Y, and a lamp T is provided inside the cylindrical portion
6A.
In the example shown in the figure, the guide plates 8X and 8Y are attached along the resistors
IX and IY, and the end portions of the arms 4X and 4Y are in contact with the guide plates 8X
and 8Y, respectively. When sliding 3Y, arms [111111] EndPage: 14X, 4Y are made to move
smoothly without rattling. The panel 9 provided on the upper part of the substrate 2 is formed
with, for example, a square hole 9a whose opening is substantially the movement range of the
holder 6, and a semitransparent plate made of acrylic, for example, to close or cover the hole 9a.
Is attached as a display surface 10. This display surface 10 corresponds to the 4-channel stereo
sound field of FIG. 2, and at the four corners facing the holes 9a of the display surface 10,
symbols 10a are formed as display portions showing the speakers 81 to S4. Ru. Next, an example
of connection of the series resistors IX and IY will be described with reference to FIG. In FIG. 5,
reference numerals 11 to 14 denote reproducing heads, which are adapted to be in contact with
the tracks T1 to T4 of the magnetic tape T to reproduce four-channel stereo signals. The
reproduction outputs of the reproduction heads 11 to 14 are equalized and amplified by the
preamplifiers 21 to 24, respectively, and then led out to the terminals 21a to 24a, and further,
for example, variable resistors 31 to 31 for volume adjustment interlocked with each other. The
amplified output is supplied to the speakers S and -S, respectively. In this example, the variable
resistors IX and IY are each formed in two series, and one variable resistor 1XA of the two series
of variable resistors 1X is connected between the terminals 21a and 23a, and the middle point
thereof The mover is grounded, and the other variable resistor IXB of the variable resistor 1X is
connected between the terminals 22a and 24a, and the midpoint and the mover are grounded.
Furthermore, one variable resistor IYA of the variable resistor 1Y is connected between the
terminals 21a and 22a, the midpoint and the mover are grounded, and the other variable resistor
lYB of the variable resistor 1Y is the terminals 23a and 24a. And their midpoints and movers are
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grounded. According to such a configuration, when the lever 3X of the variable resistor 1X is
slide-adjusted, the left and right volume changes differentially simultaneously at the same time,
and at the same time the holder 6 becomes the elongated hole 5Y of the arm 4Y. When moving
along and slidingly adjusting the lever 3Y of the variable resistor 1Y, the holder 6 moves along
the elongated hole 5X of the arm 4X at the same time as the front and rear volume changes
differentially simultaneously simultaneously. . Therefore, the light spot by the lamp 7 in the
holder 6 moves in the display surface 10 corresponding to the balance point of the volume on
the left and right and front and back of the 4-channel stereo reproduced sound, while the display
surface 10 is a speaker S, ~ S4. The position of the light spot on the display surface 10
corresponds to the plane of the room in which the volume balance point is, that is, the volume
balance is properly taken if the playback sound is heard in the room. Conversely, in order to
listen to the reproduced sound with the correct volume balance at a specific place in the room, it
is possible to easily know which position the variable resistors IX and IY should be slidingly
adjusted.
As described above, according to the present invention, the volume balance point of the 4channel stereo reproduction sound of the 2-2 system can be visually recognized, which is very
convenient for practical use. Although the above description relates to the case where the
present invention is applied to a 4-channel stereo reproduction apparatus using a tape recorder,
the present invention is not limited to this as long as it is a 2-2 type 4-channel stereo signal
transmission apparatus. The present invention can also be applied to the monitoring device of
the device. Alternatively, a rotary variable resistor can be used instead of the slide variable
resistors IX and IY. In this case, the rotation is a linear change by a belt, a gear or the like, and
the arms 4X and 4Y are used. More 0 if transmitted to
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