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BACKGROUND OF THE INVENTION
This invention relates to audiovisual teaching apparatus and, more
particularly, to apparatus for presenting motion video sequences for
educational purposes.
Audiovisual teaching apparatus in the prior art has generally fallen into
two distinct categories. The first category includes simple motion picture
or video tape programs offering instruction for the benefit of students
and permitting students to experience, through the medium of video
projection, a wide variety of subject matter. The second general class of
prior art audiovisual teaching equipment utilizes still projection or
motion video projection of events leading to a question which must be
answered by the student. Such equipment may, for example, be computer
controlled such that, when the student has made his choice, the equipment
notifies the student as to whether his choice was correct or incorrect and
often arranges the teaching set to conform with the student's learning
progress.
Both of these forms of audiovisual equipment have serious limitations. The
simple video projection, although it may be engrossing to the student,
permits no interaction whatsoever, so that it is impossible to determine a
student's retention utilizing the equipment or to have the student
interact with the equipment. Since interaction requires a greater
involvement of the student in the learning process, simple video
projection is only partially successful for educational purposes.
The second form of audiovisual teaching equipment permits a certain degree
of interaction. The limitation in this case, however, is the fact that,
when a student makes an incorrect choice, the equipment notifies him that
this choice is incorrect and either repeats the previous question or
permits him to proceed to new questions. This type of interaction is
similar to the effect on a child of telling the child, for example, that
it is unsafe to enter a busy street. The child may accept this statement,
but the mere statement can never have the effect that seeing an accident
occur in the busy street can have. Thus, although there is a certain
degree of feedback in such equipment, the feedback is a simple positive or
negative and does not reinforce the student's learning through experience.
SUMMARY OF THE INVENTION
The present invention alleviates the difficulties in the prior art
apparatus for audiovisual teaching by utilizing the engrossing medium of
motion video presentation to not only present alternative choices to the
student but also to show the student, in motion video form, the likely
consequences of his choice. The equipment includes a multitrack video
medium such as multiple track video magnetic tape or multiple track motion
picture film wherein the projected track is selected by movement of a
playback head or projection optics. Coding information is also recorded on
the video medium to automatically operate the playback monitor equipment.
The invention includes a console having a video monitor and a plurality of
switches for operation by the student. The student utilizes a switch to
begin the projection sequence, and a motion video event series is
projected on the monitor for viewing by the student. The motion video
sequence leads to a presentation of alternative choices of action to the
student, at which time the projection automatically stops. By manipulating
one of several switches on the student's console, the student can select
one of the presented optional actions to be taken. The video monitor and
recording medium automatically proceeds, through a movement of the
recording head or projection optics, to the correct medium track to
display on the monitor in motion video form the likely consequences of the
student's choice. When the likely consequence sequence has terminated, the
student can repeat the sequence, selecting a different choice of action,
or can again push the start button to proceed to the next sequence of
events.
It may be helpful to a complete understanding of the invention to cite an
example. If the equipment of this invention were utilized in training
medical students, the initial motion video sequence could depict an
emergency room in a hospital with an entering patient. During this initial
sequence, certain diagnostic tests are administered on the patient and the
student is apprised, through this video sequence, of the outcome of the
diagnostic tests. At the completion of the initial sequence, plural
numbered or lettered choices of action, such as the administration of
plural different medications, can be projected on the video monitor for
the student. The video projection then stops and the student depresses a
selection switch to signify the medication which he deems appropriate for
treating the patient. As soon as he has made his selection, the video
equipment automatically switches to a track containing the likely
consequences of this selection. If, for example, the medication which the
student doctor selected is seriously incorrect, the sequence could depict
the patient convulsing and dying. If, on the other hand, the medication
has no effect on the patient's condition, the scene which would be
depicted would show neither improvement nor degradation in the patient's
condition. If the student selected a medication which assisted the
patient, the selected scene would show such improvement.
The invention has applications in almost every field of learning, it having
been found that the motion video medium is engrossing to the student,
holds his awareness longer than almost any other form of instruction, and
can reinforce the student's learning by allowing him to experience,
through motion video sequences, the consequences of his choices.
The advantageous construction and use of this invention are best understood
through the following detailed description which references the drawings,
in which:
FIG. 1 is a perspective view of the audiovisual teaching apparatus of the
present invention;
FIG. 2 is a perspective schematic view of the video tape transport used for
projection of motion video images in the apparatus of FIG. 1;
FIG. 3 is a schematic illustration of a segment of the audiovisual medium
used in the transport of FIG. 2 of the present invention; and
FIG. 4 is a schematic diagram of the electronic logic circuit used in
conjunction with the console of FIG. 1 to operate the transport of FIG. 2.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring initially to FIG. 1, the audiovisual teaching apparatus 11 of the
present invention is shown to include a common television monitor 13, a
video tape transport 15 mounted thereon, and a switch console 17 having
plural labeled switches. The first of these switches, labeled "start", is
utilized by the student for initiating the motion video sequence. The
second switch on the console 15 is labeled "replay" and permits the
student to repeat a motion video sequence after its completion. The next
four switches, labeled "1" through "4", are utilized by the student for
selecting a course of action in response to the scene depicted on the
video monitor 13.
Located on the top of the monitor 13, the video tape transport 15 is shown
schematically in FIG. 2 to include a supply reel 18 and a take-up reel 19
for transporting magnetic tape 21 past a playback head 23. Each of the
supply and take-up reels 18, 19 is rotated on the armature shaft of a
motor 24 and 26, respectively, the motor 24 being energized to rewind the
tape 21 and being unenergized during the normal playback mode of the
transport 15. The motor 26 is a low torque motor which serves only to
generate tension in the tape 21 for collecting the tape 21 on the reel 19
and for providing adequate contact with a capstan 25. The capstan 25 is
driven by a synchronous motor 27 at a closely regulated speed. The contact
of the capstan 25 with the tape 21 may be assured by a pressure roller 29
bearing against the tape 21 opposite the capstan 25.
A pair of guides 31 mount the playback head 23 for vertical movement, as
viewed in FIG. 2, to select various recorded tracks on the tape 21. A
motor 33 drives a lead screw 35 threaded to the mounting for the playback
head 23 to adjust the position of the playback head 23 along the guides
31.
In addition, a pair of switches 37 and 39 are positioned along the path of
the tape 21, the switch 37 being responsive to metal foil tape positioned
at the top of the tape 21 and the switch 39 being responsive to metal foil
tape at the lower edge of the tape 21, as viewed in FIG. 2. As is common
in the audio 8-track tape systems currently on the market, the switches 37
and 39 are responsive to the presence of foil on the tape 21 for closure,
each of the switches 37, 39 responding only to metal foil passed adjacent
the switch structure.
Referring now to FIG. 3, the arrangement of recorded information on the
tape 21 will be described. In this exemplary embodiment, the tape 21 has
four tracks of recorded motion video information, numbered 41 through 47.
At various locations along the tape 21, only the main track, track 41,
includes recorded information. For example, during the segment T.sub.1
shown in FIG. 3, tracks 43 through 47 are blank. During this period
T.sub.1, the sequence of motion video events leading up to a requirement
for a decision to be made by the student is recorded on track 41. Also in
this period T.sub.1, after this series of events, the various alternative
choices open to the student are presented, along with a designation from 1
through 4 for each of the choices, to enable the student to make a choice
on the switches of the console 15. The segment T.sub.1 is terminated with
a metal foil strip 49 on the lower half of the tape 21, as viewed in FIG.
3. This foil strip 49, as will be understood from the detailed description
of the circuitry below, automatically stops the tape transport at this
point until a decision is made as to which of the various branch tracks is
to be played during the next time period.
This next time period T.sub.2 contains recorded information on each of the
tracks 41 through 47, each recorded track presenting the likely outcome of
different choices in response to the questions presented at the end of
time T.sub.1. The recorded information in time block T.sub.2 terminates
with a foil strip 51 at the upper half of the tape 21, signaling the end
of this branch sequence. In time T.sub.3, which occurs after the foil
strip 51, only the track 41 is recorded. This time period T.sub.3 presents
a new series of events leading to a new decision to be made by the
student. From the previous description, it would be appreciated that
switch 37 of FIG. 2 responds only to the foil strip 51 while switch 39
responds only to the foil strip 49.
Referring now to FIG. 4, the details of the logic circuitry contained,
typically beneath the switch console 15, and responsive to the switches
thereon for operating the transport 15 of FIG. 1 will be described. The
switches include a start switch 53, a replay switch 55 and four decision
selection or track selection switches 57 through 63, numbered 1 through 4,
respectively. With tape loaded into the transport 15, the first segment is
a track such as that labeled T.sub.1 in FIG. 3 and including information
recorded on track 41 alone. The educational sequence is started by the
student depressing the start switch 53. This switch may be, for example, a
momentary push button switch which is connected between a positive voltage
and the set input of a monostable multivibrator or flip-flop 65.
Depression of switch 53 sets the flip-flop 65 to produce an output,
through an OR gate 67, to energize a capstan motor control circuit 69
which may, in this case, be a simple gate or relay energized by the output
of the OR gate 67, to supply power to the capstan drive motor 27 as well
as video playback electronics 70. Depression of the switch 53 thus begins
motion of the capstan 25 of FIG. 2 to advance the tape 21 past the
playback head 23. At the same time, depression of the switch 53 places a
momentary positive pulse on a line 71 connected to an OR gate 73, the
output of which is in turn connected to the set input of a flip-flop 75.
This flip-flop 75 is connected to a head selection motor control circuit
77 to drive the head motor 33 to track 41 on the tape 21 (FIG. 3). The
signal on this same line 71 is connected to three OR gates 79, 81 and 83,
the output of these OR gates being connected to the reset input of three
flip-flops 85, 87 and 89, respectively. When these flip-flops 85 through
89 are reset, their outputs, each of which is connected to the head
selector logic 77, are grounded, or at binary 0, so that only the output
of flip-flop 75 is energized, or at binary 1, controlling the head
selector electronics 77 to move the head motor 33 to drive the playback
head 23 to a position adjacent track 41. Thus, after the start button 53
has been pushed, the head motor 33 automatically drives the playback head
23 to respond to track 41 on the tape 21, and the recorded sequence is
played on the video monitor 13 of FIG. 1. During this time T.sub.1, a
lifelike sequence of events is portrayed to the student. After this
sequence has run its course, the series of four options are presented to
the student, each option typically being presented also in motion video
form. Thus, in the example previously cited relating to an emergency room
situation for training doctors, the administration of four different
medications is possible. In that example, the choices may be presented by
the doctor in the emergency room asking the attending nurse for
medications by name, and a narrator's voice, for example, may be used to
identify the four choices by number. At the end of this sequence, metal
foil 49 (FIG. 3) will reach the switch 39 of FIG. 2. This switch, as shown
in FIG. 4, resets the flip-flop 65, deenergizing the motor control circuit
69 to the capstan drive motor 27 and the video screen goes blank. If, at
this point, the student were to again push the start button 53, the foil
49 remains adjacent the switch 39, so that the flip-flop 65 cannot be set,
there being a positive voltage on the reset input of this flip-flop 65.
The student must therefore push one of the switches numbered 1 through 4,
switches 57 through 63 of FIG. 4.
If, for example, the student pushes switch 63, a positive voltage will be
supplied to the set input of flip-flop 89. This voltage on the flip-flop
89 will set the flip-flop 89 and place a positive voltage at the input to
the head selection electronics 77 connected to the flip-flop 89, adjusting
the position of the head motor 33 so that the playback head 23 moves to a
location adjacent recorded track 47 of tape 21 (FIG. 3). At the same time,
this positive voltage from the switch 63, through an OR gate 91, sets a
flip-flop 93, producing a positive input at the OR gate 67 to energize the
capstan drive motor 27 as well as the video playback electronics 70 to
play the fourth track, track 47, one possible alternative course of events
determined to be the likely consequence of the student's choice. The
student will therefore view, in motion video form, the likely consequences
of his selection. Depression of the switch 63, in addition to setting the
flip-flop 89, resets through one of OR gates 79, 81 or 95, each of the
flip-flops 75, 85 and 87, so that the only input to the head selector
electronics 77 is from the flip-flop 89.
It can be seen from the interconnections of FIG. 4 that depression of any
one of the switches 57 through 63 by the student will set one of the
flip-flops 75, 85, 87 or 89 in accordance with the switch depressed, and
will reset each of the remaining flip-flops 75, 85, 87, 89 so that only
one input is at a positive level into the head selector 77. Furthermore,
depression of any of the switches will set the flip-flop 93 through the OR
gate 91 to energize the capstan drive motor 27 and video playback
electronics 70.
At the end of the selected video sequence, the metal foil 51 shown in FIG.
3 will be adjacent the switch 37 of FIG. 2. This switch, as shown in FIG.
4, resets the flip-flop 93, stopping the capstan drive motor 27 and
deenergizing the video playback electronics 70. A depression of switches 1
through 4 at this point will be ineffective to begin the video transport,
since the flip-flop 93 remains reset by closure of the switch 39.
At this point, the student has a choice of depressing the start switch 53
to begin the next educational sequence, that included in time T.sub.3 of
FIG. 3, or to depress the repeat switch 55. Depression of this switch 55
will set a flip-flop 95 to energize the rewind motor 24 through motor
drive electronics 97. These electronics 97 may be, for example, a simple
switch energized by a positive output of the flip-flop 95. The switch 55
is advantageously coupled mechanically with a normally closed contact pair
55a to interrupt the signal to the reset input of flip-flop 95 from switch
37 or 39 to permit setting of the flip-flop 95. The rewind motor 24 will
reverse the direction of the tape transport, as shown in FIG. 2, until
either one of the foil strips 49 or 51 closes one of the switches 37, 39,
each of these switches being connected to the input of an OR gate 99 which
resets the flip-flop 95, deenergizing the rewind motor 24. The student has
thus reversed the tape to the decision point and can select another one of
the switches 1 through 4 to view a second likely consequence of a decision
made in response to the video sequence. Alternatively, the student may
again depress the "relay" button 55 to again view the entire video
sequence leading up to the original decisional point.
From the description above, it can be seen that the system described herein
permits an interaction of the student with the video equipment, the
student viewing a motion video scene and making decisions as to how this
scene is to proceed. The instructors who produce the film include various
choices and the likely consequences of these choices portrayed in motion
video form. The student has the choice of viewing the results of various
choices or proceeding through the entire sequence on the tape.
As mentioned previously, it will be understood that the electronics of FIG.
4 will operate equally well if the transport of FIG. 2 carries
photographic film rather than magnetic tape. In this instance, the tracks
41 through 47 of FIG. 3 will be motion picture film tracks positioned
side-by-side on photographic film. The playback head 23 of FIG. 2 may then
take the form of projection optics which are moved from film track to film
track to project the selected branch of video information.
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