JPS6012882A - Video disk reproducer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an interactive video disc device, and more specifically, the present invention relates to an interactive video disc device.
The present invention relates to an interactive video disc device that displays a single program by advancing a plurality of different programs according to instructions given to the device from an external source, such as a viewer.

BACKGROUND OF THE INVENTION It would be desirable to have an interactive video disc device in which the displayed videos and sequences thereof are selected by the viewer. For example, many story plot devices allow television viewers to choose between harpy and sad endings in a program. In other configurations,
Interactive video devices can also be used for educational purposes, where problems are presented and the viewer subsequently responds. After selecting a response, the device provides assistance to the viewer or corrects the response depending on the selected response. The third interactive device concerns video games. For example, in a maze game, a viewer selects one of several interconnected paths to navigate through a confusing network of mazes.

Prior art interactive devices have had several problems.

U.S. Pat. No. 4,1''0,832 shows a tape-based video teaching device.

In this video teaching instrument, the tape is played with control markers to access a video sequence that responds to viewer actions. In the teaching device shown in the above-mentioned US patent, the responses are recorded in longitudinally adjacent trunks on the tape, for example four trunks. For instantaneous playback, ie, playback after a selection has been made by the viewer, the number of selections is limited to the number of tracks that can be recorded across the width of the tape. Therefore, it would be desirable to provide an interactive device with more selectivity at branch points.

Approximately continuous video can be provided by other interactive devices, but generally these high speed devices are expensive and
For example, an apparatus has been described in which two video disc playback devices cooperate to provide approximate instantaneous branching. An exemplary disc format for two playback devices is Urban Travel. For example, at the MIT Industry Liaison Program Conference held on January 15, 1980,
l Li, aison Program Sympo
sium), a video disk player with a brain was depicted. Here, one playback device provides a video sequence and the other playback devices position their converters for the next branch point. In a city trip, a two-disc interactive playback device t1:1 gives video to the viewer from its (7) one track, while the converter of the playback device I2 is positioned for the next turn. . When the viewer faces an intersection and requests to select one of three possible paths, the converter of the playback device 1 is positioned to give the video for one path, e.g. Then, according to the forward or backward movement of the transducer from the branching point of the trunk, the playback ring 2 is positioned to provide video for other selections, such as right turn selection or left turn selection.

This "high speed" device requires two synchronized playback devices and is expensive.

Can give more selections for any branch point,
Moreover, although two playback devices or two arm devices and other inexpensive interactive devices can be used, these devices also have some drawbacks. Some disk drives provide interactive features by locating branch data at a location remote from the branch point. This means that the data selected by the viewer is far away with respect to the position of the transducer when the branch is initiated. Although these devices are generally inexpensive and can provide multiple responses, they are not capable of quasi-instantaneous playback in response to viewer selections. After the selection has been made, the transducer must search for the location of the selected response. Typically, video is blocked during the search period.

<Summary of the Invention> In a disc device according to the present invention, a transducer is used to reproduce information signals recorded on both tracks in a recording medium on a disc. A raster of information is recorded in the segments of the biline track to display the video.

Kin force means cooperate with the converter to convert the information signal from the first bipolar line, where the converter converts the information signal prior to the skip, to the second bipolar line, where the converter converts the information signal subsequent to the skip. Give a motion to the transducer so that it skips. Branching means energizes the transducer such that the transducer branches from the first raster sequence to the second raster sequence.

The control means generates a control signal for controlling the kin-force means such that the kin-force means causes the transducer to follow a predetermined path along the bidirectional track. When following the path, the second raster sequence selected by the branching means is displayed on the display means.

According to another feature of embodiments of the invention, the first sequence is interlaced with the second sequence, and when the branch is taken, during the transition from the first sequence to the second sequence, the first sequence is interlaced with the second sequence. A continuous video is given.

DETAILED DESCRIPTION Referring to FIG. 1, a disc record 12 for use in an interactive video disc player having a turntable rotating at a constant angular velocity is shown. The disk 12 is divided into eight sectors S1 to S8. The information on the disc record is recorded in continuous double-line tracks], 01 across the surface of the disc record 12 from a starting point 103 to an ending point 104. Each line of trunk 101 is divided into eight segments corresponding to eight sectors of a disk record.
Each segment of rank +01 has one complete field of television signal recorded on it, and thus:
There are eight fields or four frames of television signals per 360 degrees of information trunk within the disk 12 of FIG. The angular displacement per field is /8-45°
and 90° per frame. Disk 12 in Figure 1
is merely an example; other devices, such as rotary two or four field devices, may be used with the present invention.

FIG. 2 shows a video disc playback device. The playback device 10 has a turntable 11 that rotatably supports a record disc J2. In each figure, each element designated with the same reference number indicates the same or similar item in each figure. Each double line on double line track 101 on disk 12 contains image signal information including a synchronization component and information identifying the particular double line. To move the stylus assembly 14 in the radial direction, the stylus assembly 13, including the signal pink amplifier stylus mounted in the yarriage machine 47f, is moved across the record 12. It is mounted in close proximity to the pick amp stylus and provides movement that moves the stylus across one or more lines of the track.
The capacitance ashing that occurs between the record and the record is detected by the pink-up circuit 16, and the video processor 1
A signal is generated that is supplied during the day and displayed by a conventional television receiver 20.

For special fruit (i.e. interaction), the signal pick amplifier stylus receives commands supplied by user input from the interactive remote control means 31, and digital auxiliary information recorded along with the image signal 1n information. (DAXI)' trace the path across the surface of the disk 12. In other words, the stylus is kicked in a "dancing" routine so that the video sequence played from the disc and displayed on receiver 20 is the sequence selected by the user. The force 4'i'1) is actuated in response to a kick pulse provided by Ol from the body 21. The kicker force mechanism 30 is provided by the DAXI reproduced in the video processor 18 and the interactive remote means 31. A pulse generator 28 generates pulses of suitable shape and/or amplitude to move the stylus the desired number of lines. energizes the stylus kick force 21. The control means 25 causes the kicks necessary to carry out the stylus movement sequences required by the program selected by the user.

An example of one stylus compensation routine performed in accordance with the present invention will now be described with reference to FIG. In this example, assume that a football game sequence has been recorded on disc 12.

The stylus starts at point 103 and moves inwards with both lines 10
Track (+-ranking) 1. A football game is displayed on the television receiver.

When the stylus reaches point 105 of both lines 101 (the start of the interactive data on disk 12), the stylus is kicked back from point loy (the start of the next two lines) to point 105 to enter the freeze frame mode. bring about During this freeze frame mode or a prelude to it, the user is prompted to choose between three selections (of course, many other selections are also possible with the device). In the football example, live commentary of a football game jj5? The transmitter notes that the primary video sequence shows the first and second plays of a football game, and the user can select this key by pressing pushbuttons A, B, or C on the remote means 31. 50 yards, line, end,
broadcast that it can be viewed from Zone 1 or End Zone 2. After the user selects a particular camera, the playback device initiates a stylus compensation routine to play the selected sequence. For example, if the user selects a camera at the 50-yard line, the stylus will skip from point 113 in the frozen frame to track circle cr) to point 115. To remain within the trunk circle, the stylus will skip to point 115. Skip past 'i' to point 119, from point 121 to point 123, and other selections including diamond (◇) trunks and triangle (△) trunks.If the user is in end zone 1 or If you select the end zone 2 camera, the stylus will track the diamond trunk (skipping from point 125 to 12'7) and the triangular track (skipping from point 129 to 131), respectively. In this device, the program sequence for any selection (e.g., program a) is intermingled with other programs (e.g., programs b and C). According to this stylus assist device, the stylus moves away from the branch point. It allows for almost instantaneous branching from one program to another, which is not possible with conventional interactive devices in external formats, as mentioned above, where the next recorded video has to be searched for remotely. Furthermore, this auxiliary device can be used in a single regeneration device or in one
can be implemented using a playback device with several transducers, thus providing a relatively inexpensive interactive device.

Figure 3a shows the program sequence with both lines of the track expanded for ease of understanding. Sectors 1-8 of the disk are shown at the top of the diagram. Both lines are indicated by reference numerals 301-307 on the left side of the figure. The letters and numbers shown in each block indicate the information recorded during the vertical blanking period of the television signal. A special embodiment for alphanumeric characters is illustrated by FIGS. 8 and 9. 1st alphabet - number 309
is used to indicate the stylus position (the current position of the stylus), the second alphanumeric character 311 is used to indicate the trunk identification for the program to be played (the future position of the stylus), and the third Alphanumeric characters (labeled) 313 give information regarding the number of both lines to be skipped and the direction of the skip (displacement). The task is usually 30 on both lines with program R.
1 and 302, recorded in sector 1.2.3. Track ID (identification) and displacement are both 0 indicating that no skipping is performed. In both lines 302, sector 4,
The program changes to freeze frame mode. both lines 303
, in sector 3, the track ID is 01 and the displacement is -1, and if the user does not change the missing track ID of O, the stylus will be kicked back into the freeze frame mode from both lines. '' duplex, the playback device remains in freeze frame mode until input is provided by the user. If the user selects program A and the stylus is in vortex m"O", sector l, the stylus will track both lines 303, sector l
, leading to sector 4. Thus the stylus is program A
1 Track ID A will be tracked.

If the user selects program C, a +1 skip is performed on both lines 303, sector 2;
When is selected, +1 skip is applied to both lines 303, sector 1
It will be held in Once the stylus is in Program A, Bi
or C, the stylus tracks its program according to the displacement command given during the vertical blanking period.

FIG. 3b shows a branching program for branching from a first program to a second or third program. If the stylus plays program A at position 315
and when the user selects program B, position 31
Track ID in 5.

B and the displacement +1 give the new program, the information where B is located and how to get there, ie the +1 displacement must be done. At the end of position @ 315, the stylus will either continue to the remaining position 317 of program A (when new commands from the user are available) or play program B (when new commands from the user are available). ) can be skipped to location 319. If the user selects program C, a skip is made from position 3'', 7 to 321, and the sequence becomes 317.323 if no new command is provided by the user.

Another program sequence is shown in FIG. In this sequence (when following the interactive material or data on the d1 disc, the stylus takes one of two paths (program Ai or B). When the user selects the path of program A, After each video field, the stylus skips to the next two lines.
When the user selects program B, the stylus is offset around program A to produce a different program sequence. With this configuration, the user can select to view a constant program (ie, Program B), skip through the constant program, and view a short sequence of materials (ie, Program A). According to this illustrated configuration, program A can play seven minutes of the playback time allotted to the interactive portion of the disc.
8 (skipping such that one field is converted per rotation), and program B takes /8 of the playback time. An example of this interactive theme is a movie with a football game sequence. Before entering the freeze frame groove 401 or the freeze frame groove, the user can either watch the football game, i.e. take the sequence of program B, or skip the program of watching the football game and watch the cheerleaders on the sideline. It is taught that one can see the sequence of program A, that is, one can take the sequence of program A.

Of course, the gist of the present invention is not limited to the programs described in section 5 above. The sequence is limited only by the creativity of the software producer and the number of tracks that can be reliably skipped. Of course, the program
Data is recorded on the disk 12 so that sector S1 becomes field 1 of a color television frame, sector S2 becomes field 2, sector S3 becomes field 3, sector S4 becomes field 4, and so on. Therefore, the phase of the color subcarriers is aligned from line to line.

Next, the stylus/kinker structure will be explained with reference to FIGS. 5 and 6. Figure J5 shows 7 Squillous Kitsuriki '17! In one embodiment, a stylus 35 having a signal pink amplifier electrode on its surface is contoured to engage a groove in a double trunk 101 on a record disc 12. It is connected to the electrode via a fly lead (thin spring-like lead wire) 35. The fly lead 38 provides pressure between the stylus and the record for double-line tracking. The stylus 35 is attached to the free end of the stylus arm 3'7, the opposite end of which is attached to the carriage by means of flexible coupling means 39 which give the stylus arm some limited freedom of movement in three dimensions. It is housed in the mechanism 14 (-J is eclipsed).

A permanent magnet 45 is fixedly attached to the stylus arm 3'7 relatively close to the stylus and is included in the magnetic field lines generated by an electromagnet or coil 46 that is selectively energized when the stylus is in the play position. It is arranged to be located. The coil 46 having a non-magnetic core is
It is electrically connected to produce a magnetic field which, when energized, imparts radial movement to the magnet 45 and, as a result, movement of the stylus.

The schematic block diagram of FIG. 6, a part of which is shown in the form of a block, shows the Kira force device of the playback device 10 of FIG.

In FIG. 6, a microprocessor 56, assumed to include the associated circuitry necessary for normal operation in response to program instructions from the playback device controller or playback device controller, uses a track identification signal (DAXI) to determine the position of the stylus. and provides an inward or outward kick signal according to the playback mode. For example, if a particular video sequence is one freeze, then at that point in the record playback the stylus is kicked out one line or one trunk for each rotation of the disc. Microprocessor 56 receives trunk identification signals and interaction signals (D
AXI). User input provided from interactive remote means 31 to microprocessor 56 is used to calculate the proper stylus position and provide proper control of the output to programmable pulse generator 28' and switch 47. The signal adjustment is determined and the stylus is repositioned to the appropriate or desired complementary line position on the line drawing track. A pulse generator 28' generates a ramp voltage proportional to the control signal provided by the microprocessor via the input bus 28. The output signal of the pulse generator at connection 51 is supplied to a changeover switch 47 for supplying the stylus kill force coil 46 . A transfer switch 4'7, controlled by a microprocessor 56 via a busbar 57, governs the direction of the current flowing through the stylus kill force coil 46, and thereby the direction of the magnetic field generated between the coils and thus of the stylus. Control the direction of movement.

Pulse generator 28' includes a current source circuit 49 that generates a high impedance regulated current in a first mode and provides a low impedance path connected to a reference potential point in a second mode. When the current source operates in the second mode, the potential across capacitor 55 is clamped to the reference potential. When the current source 49 is switched to the first mode, the potential at the connection point 50 increases monotonically according to the charging rate of the capacitor 55.

The potential at node 50 is supplied to a buffer amplifier 48 which generates an output current in the required range to drive the stylus kill force coil 46.

In a preferred embodiment of the interactive device of the invention, the tracks 101 of the disk 12 have a predetermined shape (e.g. 3
It is formed as a groove on the disk surface with a square wall. In this embodiment, the stylus 35 is provided with a tip that matches the groove formed in the disc. This matched stylus and groove can be used to aid in tracking the stylus across the surface of the disk and engagement of the stylus during kicking motions.

FIG. 7 shows how the stylus 35 with a tip 701 engages the grooves 101 of the disc record 12. Triangular groove walls 703 and 705 guide the stylus tip 701 so that it rests on the bottom of the groove 701.

Current technology generally limits styluses to a limited number of grooves (
For example, ±2 vortex line grooves) can be reliably kicked. One advantage of interactive devices with grooved disk records is that if the bottom of the stylus 707 rests within the width of the groove, the tip of the stylus will generally mate with the selected groove. . As a result, a continuous servo control loop is not required, reducing servo cost and reducing the potential for extremely slow response and instability. In FIG. 1, the tip of the stylus is indicated in phantom by the reference numbers 701' and 701. These poles ψ1 denoted by 701′ and 701〃
In position 11, the stylus comes into engagement with the bilinear groove located below the tip. In this device, the groove walls 703 and 705 of both line grooves can help the stylus properly track the complementary line. When the stylus, shown at position 701', is in the groove as shown, the stylus is forced into the bottom of the groove by the guide wall 705. on the other hand,
The stylus at the imaginary line 701'' is on the guide wall '7 of the line drawing groove.
03 to the right toward the bottom of the groove. One advantage of the invention, therefore, is that the stylus coincides with the groove of the record which forces the stylus into the proper groove when a kick is to be made. This allows for faster movement than using a servo to position the stylus. The shape and dimensions of the groove and stylus tip do not need to be indicated numerically. In commercially available video disc playback devices using grooved records, the groove bottom angle is approximately 140°.

FIGS. 8 and 9 show that in order to execute the auxiliary motion routine,
This explains the digital information (DAXI) recorded on the disk surface. NTSC for use in video disc devices configured according to embedded subcarrier technology
Details of the television signal format are 1 color information converter'
t(coloγt・Information Trans
No. 3,872,498 to Prittchard, D. According to the NTSC system, the vertical blanking period is one half of the inked odd and even fields of a television frame. Referring to FIG. 8, as is well known, the standard vertical blanking period includes a first equalization pulse period, a vertical sync period, a second assimilation pulse period,
It includes a horizontal line period at the beginning of the subsequent 6 new fields. Video signal information is FieldE line 2
2' and field 2 line 284'. DAXI information representing field numbers and interactive information is shown on line 17' for field l and line 280' for field 2.
It is expressed as Similarly, digital information can also be inserted into other lines of the vertical retrace interval. To show the form of the DAXI signal in detail, Figure 9 shows a horizontal line (line 17') containing data.
or line 280') is shown on an expanded time scale.

Referring to Figure 9, the data is shown in terms of luminance levels, where 100' IRE units are logical '1'.
', Q IRE unit (erase) represents logic '0'.

The first data follows a standard horizontal sync pulse 901 and a color burst 903. color, burst 9
The frequency of 03 is approximately 1.53 MHz, which is the frequency of the embedded subcarrier. Each data bit is transferred synchronously with a 1.53 MHz embedded subcarrier signal. The digital message consists of a 13-bit start code, referred to as B(X), a 13-bit redundancy error, referred to as C(x), a check code, and 51 bits of information, referred to as I(X). Consists of bits. The start of the next horizontal line is the next horizontal sync pulse 90
1a and color burst 903a. Therefore, each data focus is synchronized to the color subcarrier and all digital messages are synchronized to the vertical sync pulse.

It goes without saying that the data rate can be a multiple or submultiple of any suitable subcarrier frequency.

It is also possible to assign other values of luminance to logic and logic O, and to associate more than one bit with a given luminance level.

Start code E(X), error check code C(X
), field number (18 bits), and band number (6 bits).

No. 4,308,55'7 to C.B. Dieterich entitled ``Disc System''. In video disc devices of the type described here, the field numbers and band numbers can be used for trunk error correction or other special feature effects for the playback device, and are The information conveys the first alphanumeric character (Figure 3a) giving the current position of the stylus. In the invention of the aforementioned U.S. Pat. No. 4,308,55'i', 2
Seven unused information bits are shown. In the device of this invention, in order to perform auxiliary movement of the stylus,
Eight of these bits are used for interactive data. The first four of the eight bits are used for the trunk identification number (second alphabet-i in Figure 3a). This number is used to identify what type of image will be present in the groove following the next vertical blanking period. For example, a trunk with an ID (identification) of O indicates a freeze, and a track with an ID of 1 specifies a particular program sequence. The next 4 bits of the 8-bit dialogue data are displacements (3rd alphabet in Figure 3a).
used to identify numbers). The displacement has a number given a sign, that is, a displacement toward the inside of the disk or a displacement toward the outside of the disk. Therefore, the first bit of displacement represents the direction of displacement, eg 1' indicates inward displacement and 0# indicates outward displacement. The next three bits of the four bit displacement code indicate how many grooves are to be skipped. A displacement of 0# indicates that no kick is needed and should remain in the proper trunk, and a displacement of 1.2 etc. is used to indicate a displacement of 1.2 trees, etc., respectively.

The sequence of events for determining the necessary force drive parameters for the microprocessor 56 of FIG.
This is schematically illustrated by the flowchart in FIG.

General equipment for monitoring and kick control are not shown in the routine. This particular routine shows that the stylus force device used to maintain proper grooves is
Adaptive stylus force using track and disk sector information (ΔadaptiVe 5tylus
Kicker IJsing Disc Track
and Disc 5ector Information
No. 4,330.8'79 to the same inventor entitled "On)". The first process block 1001 of the flowchart diagram is The micro stone processor reads DAXI and commands the user to input.After reading DAXI and extracting the user's input,
A first decision block 1003 determines whether the trunk ID is equal to the requested truck ID. If negative (
If no), the decision point 1005 is the last DAXI
Determine whether there has been any user input since the was read. If affirmative (YES), the video is erased at 1007, the audio is cut off, and normal playback continues. If the response at decision point 1005 is negative, the playback device continues normal playback at 1009. If the response at decision point 1003 is affirmative, decision point 1017 is reached. Decision point 10
At 1'i', a determination is made whether the user has just entered. If affirmative, block 1 of unset flag
Proceed to 019. This flag indicates whether the user has just made an input. From the non-configuration block 1019, the playback device advances to the non-erasure block 1011, where the video is not erased and the broken audio is not blocked. On the other hand, if the user has not made a recent input, block 1011 is reached and the video is not erased and the audio is not cut off. Decision block 1013 determines whether the displacement is equal to O. If affirmative, the playback device is a regular playback block 1
If the answer is negative, the playback device moves to processing block 1015, where a kick is performed by the displacement amount, and the playback device continues operation at normal playback block 1009.

Next, the operation of the reproducing apparatus will be explained with reference to flowchart 1 in FIG. In the normal case where the user does not provide an up-to-date input, the playback device will encounter a matching track ID every time (this path will include an affirmation from 1003 and
101'7). When this condition occurs,
The video is not erased at block 1011, but a displacement is made so that the stylus remains on the selected trunk.

In this normal state, the playback device encounters an inconsistent trunk ID (no branch is taken from block 1003).
. In this case, unless the user makes an input at block 1005, the playback device continues normal playback. Therefore, in normal operation, the user will see the selected track.

In the freeze frame mode, the playback device detects a -1 displacement and the stylus is kicked banked to maintain the freeze frame.

If the user has provided correct input to select a particular program sequence, a flag is set in block 1001. Generally, the trunk ID is not equal to the requested trunk ID, so the playback device takes the negative branch from block 1003 and the positive branch from block 1005, and the video is erased. Therefore, the playback device continues normal operation.

When the stylus is positioned such that the track ID is equal to the requested trunk ID, the playback device takes the affirmative branch from block code 003. Blockco-01'
As a result of taking the affirmative branch from 7, the user's flag is reset and the video becomes unerased. According to the displacement command, the playback device moves to the path 1013 '11015.100
9 or 1013.1009.

Although the above description includes one track ID and displacement, it will be apparent to those skilled in the art that more than one set of trunk IDs and displacements can be provided during the vertical blanking period.

This has the effect of allowing faster track switching.

FIG. 11 shows a block diagram of a video disc encoder for encoding information into a format suitable for masking an interactive disc.

A composite video signal is provided by signal source 1101.

The signal source 1101 can be a tape recorder containing a tape prepared using studio-style editing equipment, and the interactive data is recorded on the tape according to the manner in which it is mixed onto a double-line trunk on the disk surface. Mixed on top. In adder 1103, the composite video signal is
It is combined with the stream of digital data bits on conductor 1105 provided by digital data generator 1107. The synchronization means 109 has a terminal where the data bits generated by the digital data generator 110'7 are connected.
The color subcarrier and synchronization pulses are generated in synchronization with the color subcarrier appearing in the vertical blanking interval, thereby causing the digital message to be coded on the appropriate horizontal line within the vertical blanking interval. Information bits appearing on data buses 1113 and 11]5 and representing video field numbers, band numbers, and interactive data are provided by device 111'7. Device 1117 responds to the SAMTE time code provided by signal source engineer 101 to determine the field number.
It may be a computer that provides information and interactive data. Digital data and video signals are sent to adder 1103
is synthesized with Furthermore, the signal processing means] 121 conditions the board video signal for use in a recording medium. The composite video signal is in embedded subcarrier format and is recorded using FM modulation techniques. The signal cuts the groove/Kome's cutter head 114
6, and the signal information is recorded on the metal substrate 1123 at the same time. The cutter head 1146 is rotated by the rotation of the turntable 1125 in response to the rotation of the drive motor [27].
Relative movement is provided between the substrate 1123 and the substrate 1123 . The blank disc for use by the corrupter is made from a metal substrate 1123 by techniques well known in the record stamp industry.

It should be noted that in the device of this invention, the skipping through the mixed program occurs just before the vertical blanking period. Grooved video where skipping occurs within both lines that can be reliably skipped.
In disk drives, it is believed that a skip operation takes about 1 millisecond. If the skip begins about 5 horizontal lines into the vertical blanking interval, the viewer will hardly notice or be affected by the duration of the skip.

FIG. 12 shows another program sequence recorded on the interactive disc. Referring to FIG. 12, an apparatus for recording sixteen programs (A through P) on an interactive disk is shown. The freezing frame FF is formed into a disk consisting of two lines. This results in 2
Only this version allows you to access any of the 16 programs by skipping both lines below. The skip sequence for this interactive disc includes playing the l field followed by skipping both lines of the 2-tree.

As mentioned earlier, with mixed discs, generally if the stylus is not on the right track at the right time,
By simply waiting for less than one line, the stylus typically ends up in the selected program material. Therefore, if a user loses video, the device described in detail will correct it within one revolution of the turntable within four frames of the video.

Although the embodiments described herein include specific examples relating to the software described herein, these sequences are not so limited.

It goes without saying that multiple skip sequences for various programming techniques are within the scope of the present invention and the claims. For example, more than 16 program sequences may be recorded using a single freeze frame stroke.

In this configuration, the initial skip to the program is coded using user input.

This is done by an on-disk announcer instructing the user to provide input, which is used to kick the stylus into the selected program sequence. Although the stylus assistance routine described above was described with reference to the case of kicking the stylus to the inside of the disc, there are many programs in which it is desired to skip towards the outside of the disc. Needless to say. For example, for the football game/cheerleader sequence, the rotation inward allows you to see the football sequence.
For the cheerleader sequence, it is desired to skip outward.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a video disc record having a central line trunk constructed according to the principles of the present invention; FIG. 2 is a block diagram of a disc record reproducing apparatus including a stylus-killing force mechanism; FIG. 3a; Figures 3b and 4 show the I/'i complement trunk expanded to make it clear; Figure 5 shows the record disc program configuration; Figure 5 shows the stylus arm with electromagnetic force device; La schematic configuration diagram showing the structure, Figure 6 is a block diagram of the stylus/killer force device, 8g7
Figure 8 is a schematic enlarged view showing a video stylus tracking conforming spiral grooves on the surface of a video disk; Figure 8 shows the waveform of the vertical blanking interval preceding the even and odd fields of a television signal; FIG. 9 is a diagram illustrating the format of digital data used for interaction tracking in an interactive video disc device; FIG. 1O shows how the device of FIG. Figure 12 shows a flowchart showing the sequence of keeping the stylus in track; Figure 12 is a block diagram showing a schematic representation of a video disc encoder according to this invention; FIG. 6 is a diagram showing other recorded disc program formats. J2...Task recording medium, 21...Killing force means, 35...Stylus (converter), 30...
Control means, 31... Branching means, 54.56... Digital data receiving means. ! li:l i+ Applicant RCSNY Corporation Director Satoshi Shimizu and 2 others aqua 'X10 diagram off 2 diagram

Claims (2)

[Claims] (1) having a transducer for reproducing the information signals recorded in the double-line tracks in a recording medium in the form of a disk, the raster of information recorded in the segments of the double-line tracks to provide a visible representation; In conjunction with the above converter,
the transducer so that the transducer skips from a first vortex line, where the transducer is converting the information signal before skipping, to a second vortex line, where the transducer converts the information signal subsequent to the skip; killer force means for producing a motion; branching means for urging said transducer to branch from a first raster sequence to a second raster sequence; providing a control signal for angularizing the killing force means such that the transducer is caused to follow a predetermined path along the vortex line track, thereby causing the transducer to follow the predetermined path; and control means for causing said second raster sequence selected by said branching means to be displayed on a display means when said branching means selects said second raster sequence. (2) A transducer for reproducing information signals recorded in both tracks in a disc-type recording medium, and first data corresponding to a first position of the transducer with respect to the recording medium. a second data word corresponding to a predetermined raster sequence; and a third data word corresponding to a displacement required to reposition the transducer from said first position to said raster sequence. digital data receiving means responsive to said information signal for reading said data words; and input means for providing input words to said digital data receiving means to select said predetermined raster sequence. , in conjunction with said transducer, said input word from said input means into said second data word such that said transducer is repositioned from said first position to said raster sequence by said displacement. and means for causing movement in said transducer when corresponding.