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? Variable impedance device for 4-channel acoustic system ? Japanese Patent Application No.
46-25362 [phase] Application No. 46 (1971) Apr. 21 public closing 46-5327 @ A. 46 (1971)
Nov. 29 Priority claim [phase] April 23, 1970, Mark America, Inc. [312] inventor Merbin, Arthur,
Race ? Applicant ? Motorola, Inc. Motorola, Inc., Florida, Florida, Florida, United States of
America Park, West Grand Avenue 9401 [Fa] Attorney Attorney Sugimura The present invention
relates to a variable impedance [111111] device for controlling sound volume and sound quality,
and more particularly to a plurality of variable resistance devices controlled by a common axis
device. In the past, variable resistance devices of the type commonly used to control the sound
and sound quality characteristics of audio signal reproduction devices were generally formed in
separate housings, combined together and controlled by a common control axis. When two or
more such variable resistance devices are combined together, these potentiometers or
potentiometers are relatively cumbersome to handle. Also, it is difficult to match and use a
predetermined pair of variable resistance devices for two volume control on a common axis for
stereo operation, for example. Furthermore, to control four or more channels of audio with the
volume and tone control knobs, the dimensions of the four variable resistance elements provided
on the common control axis can be significantly increased for many applications and four The
problem of tracking of variable resistance is extremely difficult. The use of a single control knob
for each channel eliminates the tracking problem, but further complicates the handler,
particularly the driver of the vehicle. That is, when a 4-channel tape player is used in a car, two,
three or four control knobs for volume and tone control are required, which is awkward to
handle. In order to obtain double stereo in a 4-channel acoustic system, the driver of a car
operates a minimum number of control units to achieve the required volume, sound quality and
balance control of all 4-channels of sound reproduced by speakers. desired. If the driver of the
vehicle needs to handle too many control knobs, it will probably divert its attention from driving,
resulting in a dangerous situation which could result in a serious accident. Also, it is extremely
difficult for the driver to position the sounds emitted from the four speakers so that the driver or
passenger is at the center of the sound. It is an object of the present invention to provide a
plurality of variable impedance devices which can be operated with a common control axis
smaller than that of the prior art.
Another object of the present invention is to provide an adjusting device for balancing the
relative volume level of a 4-channel audio system [111111] EndPage: 1, and the adjusting device
itself provides a two-dimensional reference to the position of the user, ie the driver of the vehicle
etc. The movement of the adjusting device in the reference plane is shown in a plane so that the
position of the user-listener relative to the center of the sound is indicated. Another object of the
present invention is to provide an adjustment device which visually and aurally balances the
relative volume levels of a four channel sound system. The feature of the present invention is
that the contacts move on the resistance plate, and three or more fixed points for the connection
terminal are formed on the resistance plate, and the resistance component between each of the
fixed points and the movable contact is It is characterized in that a resistance plate or the like
which is changed by the movement of the movable contact over the entire surface of the
resistance plate is formed. The invention will now be described with reference to the drawings.
FIG. 1 is a front view of a four-channel sound reproducing apparatus, and an apparatus 10 shown
here is a cartridge tape storage type four-channel eight-track tape player. The tape player 10 has
an insertion slot 12 formed in its front wall 14 so that a cartridge having a tape which has
already been recorded can be inserted into the insertion slot 12 by a conventional method. In
many cases, the tape player is automatically started by inserting the cartridge to play music and
the like from the tape. A control knob 16 is formed on the front wall 12, which has any desired
function, for example the function of changing the position of the magnetic tape pickup head in a
tape player. When reproducing four channels of sound from a single acoustic system, it is
desirable to simultaneously and narrowly use the variable impedance device of the present
invention to control the various functions of the individual channels. The control 22 is more
advantageously defined by an opening formed in the front wall 14 of the tape player 10, and any
orientation of the single control knob device 24 within the control 22 in the plane of the void ?.
To be able to move to In particular, the control knob device 24 has a common shaft member 26%
q4k-diary 9 ? d, s / l: l- mountain n ?-, + m- + 1-- ,. ?????????? For example, the
operator rotates the internal control knob 24a to change the volume of the 4-channel acoustic
device or extends the external control knob 24b from the non-conductive plate 28 to rotate
[111111] and form at the other end of this axis The movable contact 30 can be moved in any
two-dimensional direction across the surface of the flat resistive element 32.
The shaft 26 is connected to ground or any other suitable reference potential by printed circuit
conductors provided in the plate 28 as required. A flat plate resistance element 32 is attached to
the back of the front wall 14 acting as a support member, and the resistance element 32 is
substantially aligned with the opening 22 formed in said wall, and the control knob device 24
and the nonconductive plate 28 are optional. By sliding in the direction of, the variable resistance
surface in which the contact 30 moves in all directions is obtained. That is, since the nonconductive plate 28 moves in a plane, the contact 30 is always in contact with the surface of the
variable resistive element 32 to set the resistance between each of the four contact points A, B, C
and D and the contact 30 Change. In the illustrated example, the two-dimensional movement of
the knob assembly 24 is achieved by providing a pair of spaced apart wall members 14a and 14b
between which the non-conductive plate 28 is fully extended and always confined. Ru. The twodimensional control section defined by the opening 22 can be hemispherical, and the control
knob device 24 may have a non-rectangular structure that can be moved by any of left, right, top,
bottom or any combination thereof. is there. A suitable friction device is provided to hold the
moveable non-conductive plate 28 rigidly in place so that it does not accidentally change its
position due to vehicle vibration. Here, for example, a plurality of pressurizing devices 31 are
provided at several positions behind the wall 14b to frictionally press the non-conductive plate
28 against the front wall 14a to hold the plate 28. The pressure device 31 has a pressure contact
member 31a made of a material such as Teflon, and is pressed forward by a spring 31b having a
pressure adjusted by a screw 31c. The back of the front wall portion 14 can be coated with
Teflon or other smooth material to ensure that the user is free to move the control knob
assembly 24 under reasonable manual pressure. In particular, the opening 22 is a plan view of
the internal structure of the car и v1 + pJIII + Il / IKt 4'tVLIu /; 1iLta day early early QpfMlfL
Collect the sound emitted from the four speakers at one point where the listener is surrounded
by the sound Indicates By moving the control knob in the plane of the board 8, it is desirable for
the listener's position [111 111] EndPage: 2. However, if there is a passenger in the car, the
center of sound can be easily adjusted simply by moving the control knob 24 in any direction
indicated by the arrow in FIG. The driver can center the sound more accurately than the visual
position of the knob 24 in the opening 22. The resistance plate 32 may be attached by means of
suitable support members 34 aligned with the opening 22 and surrounding the opening or at a
plurality of discrete positions on its periphery.
The four circuit connections designated A, B, C and D are electrically connected to the connection
terminal fixing points in the four quadrants of the resistive element 32. The details are shown in
FIG. The circular area 30a shows the contact portion of the contact member 30 of FIG. 3, which
is the contact portion 30a and the fixing points A, B. It means that the resistance between any
one of C and D changes with the positional change of the portion 30a. It is preferable to form on
the resistive element 32 a device which changes its electrical properties exponentially from one
position of the contact 30, for example, to another. Here the slots 36a, 36b extend from the four
sides of the resistive element as shown in FIG. 4 and terminate short of its center. Shown as 36c
and 36d. The resistive element 32 comprises at least any suitable device that changes the
impedance characteristic at its surface. The slots can be of any configuration to achieve the
desired electrical characteristics, and are sufficiently narrow to allow the contacts 30 to be easily
moved between them at all times. Connections A, B, C and D are connected to the circuit using
different connections of each of the 4 channels of the sound reproduction system to adjust the
relative gain to each other, and the balance of the conventional 3D sound system achieved with
the 4 channel system Make the mutual channels similar to control balanced. Volume control with
the impedance device of the invention is obtained by means of a resistive element 40 which is
arched around the axis 26 and fixed to the non-conductive movable plate 28. The movable wiper
contact 42 of the volume control knob 24a contacts the arched resistive element 40 and the
resistance is changed by turning the knob 24a in the usual manner. An arcuate slot 44 is formed
in the tone control knob 24b to pass the wiper contactor 42 through the control knob 24a. The
tone control knob 24 b has a wiper contactor 46 in contact with a bowed resistive element 48 of
the resistive element 40. These variable resistance devices are connected by means of suitable
printed circuit leads extending from the ends of the arched resistive elements 40 and 48 to a
suitable lead device, generally designated 50, provided at one end of the movable non-conductive
[111111] root 28. Wiper contactors 42 and 46 are also connected to lead device 50 by suitable
flexible leads extending along or through this axis from axis 26. Although this does not need to
be rotated with respect to the shaft 26, it is simply positioned on the control knob by a suitable
holding device (not shown) by providing an axis for the control knobs 24a and 24b and rotating
about this axis with this control knob So easily achieved. FIG. 6 diagrammatically shows a fourchannel sound reproducing device with the variable impedance device according to the invention
connected to a circuit.
Here, four independent amplifiers for four channels are indicated by A ', B', C 'and D', and
terminals 5L 52 for receiving respective audio signals from the magnetic pickup in the tape
player 10 at respective inputs. Connect to 53 and 54. Therefore, each separate output 55 ░
56.57 and 58 is connected to a suitable speaker device not shown. The variable resistive
elements 32a, 32b, 32c and 32d respectively show the resistance between the contact area 30a
and the optional fixing points A, B, C and D. The movement of the contact 30 on the surface of
the resistive element 32 simultaneously changes the resistance of each resistor 32a, 32b, 32c
and 32d to balance the acoustic device. Volume control is a single potentiometer shown at 40a,
each amplifier A '. Connect to B /, C / and U circuit devices and connect the other end to a DC
voltage source. Similarly, the tone control 48a is connected to the circuit arrangement of each
amplifier A ', B', C 'and D' and to a DC voltage source. The device described herein controls a
plurality of functions by a single control axis device moving in two directions to obtain a common
control of the balance of each channel of the sound reproducing device to center the sound, and
It is a simple, compact and effective device that provides sound and volume control of the sound
device by means of rotatable inner and outer control knobs. Thus, it is clear that the device
according to the invention can be modified without departing from the scope of the invention. In
the practice of the present invention, the following items can be taken as implementation
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows the variable impedance device of the
present invention [1111111 FIG. 2 is a partially enlarged view of the tape player of FIG. 1
showing the variable impedance device of the present invention; 2 is a side sectional view of FIG.
2 showing the details of the structure, FIG. 4 is a plan view of a plate-like resistive element used
in the present invention, and FIG. 5 is pivoted around the common axis of FIG. FIG. 6 is a circuit
diagram of an example of a four-channel acoustic amplification system comprising the variable
impedance device of the present invention. 14
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии External Control member, A, B, C, D иии и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и non-conductive plate, 30 и и и и electrical contacts, 32 и и и и и и и
impedance element 40... Resistive element 42... Wiper contact member.
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