JPS62198282A - Image information display device - Google Patents

Abstract

PURPOSE:To obtain immediately desired image information without a waiting time, by stopping a repeated reproducing operation, and executing a menu display, in case an instruction of a fact for executing a menu display for selecting the desired image information has been outputted. CONSTITUTION:When specified image information is in the course of a repeated reproducing display, in case an instruction of a fact for executing a menu display for selecting the operation is stopped, and the menu display is executed. That is to say, in case the specified image information is displayed on a screen of a CRT100, a sound of music, etc., is made to flow by synchronizing with it. On the other hand, when image information which is taken charge of by an image signal reproducing device 10 of a device No.1 is designated by a key operation in the same way, the image signal reproducing device 10 of the device No.1 is brought to an access, and also, a prescribed track of a magnetic disk in the device 10 is brought to an access. At the same time, a video switch 18 is switched to a contact (a) side, an an image signal which has been reproduced by the video signal reproducing device 10 is outputted to the CRT100 through the video switcher 18, and displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an image information display device that displays various types of guidance information on a television screen based on information input by inputting keys manually or the like.

[Background of the invention]

Recently, various kinds of guidance information, such as shopping information, movie, theater, sports, etc., are displayed on the TV screen by the user manually inputting the desired information. Information display devices (information systems) have been developed and put into practical use.

By the way, a video signal reproducing device such as a magnetic recording/reproducing device is used as a terminal device of such an information system.

When using an information system, users usually wish to obtain necessary guidance information in as short a time as possible. Therefore, a recording medium for a video signal reproducing device, for example a magnetic recording and reproducing device, is required to be capable of rewriting data such as guide information and to have a short access time.

Magnetic recording media include video tape, video disk,
There is a video floppy, but while video tape allows image information to be rewritten, it has the disadvantage of long access times.

Furthermore, although the access time is short for video discs,
A drawback is that it is difficult to freely rewrite image information.

On the other hand, a floppy disk has a relatively short access time and image information can be freely rewritten, making it suitable as a recording medium for a magnetic recording/reproducing device as a terminal device of an information system.

However, the amount of information that can be recorded on a video floppy is small, and in order to prepare necessary and sufficient guidance information for an information system, this information must be recorded on a plurality of video floppies. Therefore, an information system requires a plurality of magnetic recording and reproducing devices to reproduce guide information from a plurality of video floppies.

By the way, in conventional information systems in which multiple video signal reproducing devices such as magnetic reproducing devices are controlled by a single combiator (for example, a personal computer), when a user manually inputs keys or the like, First, a menu for selecting desired guidance information is displayed on the screen, and then the guidance information corresponding to the menu number specified by the user is reproduced by a video signal reproduction device controlled by a computer, and It will be displayed on the screen.

However, in conventional systems, certain image information, for example, when image information has not been selected by the user, etc.
Even if an instruction to display a menu is given through a manual input operation such as a key while various image information for display such as landscapes displayed on the display screen is being repeatedly reproduced, the reproduction of the specific series of image information ends. There was a problem in that the menu was not displayed until the

[Purpose of the invention]

The present invention was made in view of these circumstances, and
It is an object of the present invention to provide an image information display device that can instantly obtain desired image information.

[Existing requirements of the invention]

In order to achieve the above object, the present invention provides an image information display device that selectively extracts various image information based on input information and displays it on a display screen, including a plurality of video signal reproducing means for reproducing various image information. , a manual means for selecting desired image information and specifying a display mode, a display means for displaying the specified image information on a display screen, and a specified information G from the input means. control means for accessing a specific or all of the plurality of video signal reproduction means and transmitting desired image information to the display means; is repeatedly played back and displayed on the display screen of the display means, and if an instruction to display a menu for selecting guidance information is issued by the input means, the repetitive playback operation is stopped; It is characterized by displaying a menu.

[Embodiments of the invention]

Hereinafter, preferred embodiments of the image information display device according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a schematic configuration of an information system to which the present invention is applied. In the figure, reference numeral 10 indicates a video signal reproducing device as a terminal device of this system, and in this embodiment, two video signal reproducing devices are provided. These video signal reproducing devices IO have device numbers.

(No, O, No, 1) and are connected to a central computer, for example, a small computer 1 called a so-called personal computer, via an interface 50 and a bus line 20, respectively.

Since all types of personal computers are equipped with a terminal for connecting a printer, a so-called Centronics output terminal, it is preferable to use this terminal for connecting a device assembly. By doing so, the computer program for controlling the video signal reproducing device also becomes the front vehicle.

From interface 5o to device l, as detailed below.
Various control signals (forward feed, reverse feed, reset signal) are sent to O.

A CR in which the video signal output of one of the two video signal reproducing devices 10, video signal reproducing devices No., Q, No. 1, is connected to the computer 1 via a video switcher 18.
It is designed to be output to Tloo.

Further, the cassette interface 25 is connected to the video switcher 18 via the path line 20, and for example, the video signal reproducing device 10 of device No. 0 is connected to the computer I.
When accessed by a command from the cassette interface 25, a control command to play the cassette tape 35 is simultaneously sent to the cassette interface 25.

As shown in FIG. 2, the computer 1 is provided with an operation panel 102 on the front of the housing, and as shown in FIG. A numeric keypad 150 for specifying a menu of guidance information to be displayed on the screen, a correction key 152 for correcting the menu specification, and a start key for instructing to start playing the guidance information of the specified menu. key 1
54, various keys are provided, including a menu call key 156 for instructing to display a menu on the screen of the CRTloo, and a repeat playback key 158 for instructing to repeatedly reproduce specific guidance information. An instruction section 160 is provided adjacent to the instruction section 160 on which a menu of guidance information and an input operation method are written.

In the above configuration, when desired image information is designated by manual key operation on the operation panel 102, a predetermined command is sent from the computer 1 to the pass line 20, and a magnetic reproducing device or the like is used to reproduce the corresponding guidance information. A predetermined track of a magnetic recording medium such as a magnetic disk such as a video floppy is accessed by the video signal reproducing device 10, for example, the video signal reproducing device 10 of device No. 0, and on which the video signal to be reproduced by the reproducing device 10 is recorded. be accessed. At this time, the video switcher 18 is switched to the contact side, and the cassette interface 25 receives and receives control commands from the computer 1, and reproduces the audio (for example, music) recorded on the cassette tape 35.

In this way, specific image information (in this example, the device N
When the image information reproduced by the video signal reproducing device 10 (o, o) is displayed on the screen of the CRT 100, audio such as music is played in synchronization with this.

On the other hand, when the image information handled by the video signal reproducing device 10 of device No. 1 is similarly designated by a key operation, the video signal reproducing device 10 of device No. 1 is accessed, and the internal information of the device 10 is accessed. A predetermined track of the magnetic disk is accessed. At the same time, the video switcher 18 is switched to the contact a side (the state shown in the figure), and the video signal reproduced from the video signal reproducing device (device No. 1) 10 is output to the CRTloo via the video switcher 18.
Desired image information is displayed on the screen of CRT 100.

In this embodiment, since there are two video signal reproducing devices to be controlled by the computer 1, the video switcher 1
8 used a two-man output type, but in order to expand the functions of the information system, it is possible to control a large number of video signal reproducing devices by a computer and display desired image information on one display screen. For example, as shown in FIG. 4, a multi-degree video switcher with a large number of inputs is used to output a video signal indicating guidance information from only one specific video signal processing device to CR'l"100. In the figure, 104A, t.

4B is a video switcher with the same configuration that can be powered by four people and has one output; in this example, video signals from four devices No. 0 to No. 3 are sent to each of the four video switchers 104A No. 0 to No. 3. A playback device is assigned. And these N
The video switchers 104A of o, Q to No. 3 respectively select the video signal output of one of the video signal reproducing bags W10 of groups A to D, and further select the video signal output of each video signal output of these four video switchers 104A. One of them is selected by the video switcher 104B and output to the CRTloo in the computer 1.

Here, each video switcher 104A, 104B is switched and controlled based on the video signal reproducing device designation information included in the control code output from the computer 1 onto the pass line 20. The control code consists of 8 bits as shown in Figure 5, of which the lower 4 bits P
AO-PA3 specifies 16 video signal reproducing devices 10 (
address). That is, the above 4-bit PA
The lower two bits (PAL, PAO) of O to PA3 switch each video switcher 104A, and these video switchers 104A specify the video signal reproducing device IO of a specific device number of each group A to D.

Here, each of the video signal reproducing devices 10 with device No. 0 to 3 has the lower two bits (PA1, PA O) "00" and "01".
", "10", and "11". For example, if the lower two bits (PAL, PAO) are "00", the video signal reproducing device of device No. 0 in each group A-D, respectively. 10 is specified, and each video switcher 1
These video signals are output to the output terminal of 04A.

Also, the upper bit of the 4 bits PAO-PA3 (PA3
, PA2), the video switcher 104B is switched, and one of the video signal outputs of the four video switchers 104A is selected and output to the CRTloo.

Here, each video switcher 104 of No, O to No, 3
The upper 2 bits (PA3, PA2) of A are “00” and “0”.
For example, if the upper two bits are "01", the video signal output of the No. 1 video switcher 104A is selected, and eventually the video signal output is 4.
If the bit (PAO~PA3) is 0100J, B
Device number belonging to the group.

The video signal output of the video signal reproducing device 10 of No. 0 is selected.

Furthermore, the fifth bit PA4 of the control code is 1.
This is for specifying all six devices 10 at the same time. When bit PA4 is at high level (=1), all devices O are accessed and controlled simultaneously by computer 1, regardless of the values of the lower four bits PAO to PA4.

The upper two pins 1-PA6 and PA7 are the video signal reproducing device 1.
This is a control focus for transferring the magnetic head 12 (FIG. 7) of 0, and has the following functions.

6e1 to P, 7=1 to P...Recent PA6=1. P
87-0...forward to P6=0, PA7=1...reverse to P6=0, to P7=0...connection relationship between video switcher 104 and pass line 20 is shown in Figure 6. In the figure, video switcher 104
are video switchers 104A and 104B shown in FIG.
This figure corresponds to the above, and shows the specific configuration of one of the five video switchers. The video switcher 104 includes a two-switch switch 106 for selecting a data signal (control code PA O - PA 4 ), a latch circuit 108 that latches the captured data signal via the switch 106, and a strobe signal 5TROBE. It is comprised of an inverter 110 that inverts the signal and uses it as a clock signal for the latch circuit 108, a data multiplexer 112 made up of various gate groups, and an amplifier 114 that amplifies the video signal selected from the data multiplexer 112. Terminal T. -T
3, the video signals VDO to VD3 of the video signal reproducing devices 10 of the devices O to 3 are inputted.

The data multiplexer 112 outputs each video signal VDO to V of the video signal reproducing device 10 (NaO to A3) input to the terminals A to D according to the data input to the terminals G1 and G2.
D3 is selected. That is, when G1=02=O, the video signal VDO is 5, and when G1=1 and G2=0, the video signal VD■
However, when G1=0 and G2=1, video No. 43 VD2 becomes G1
When =02=1, the video signal VD3 is output from each terminal E.

Further, when the video switcher 104 corresponds to the video switcher 104A in FIG. 4, the changeover switch 106 is switched to the contacts a and c as shown in the figure, and when the video switcher 104 corresponds to the video switcher 104B, the contacts are switched to the sides a and d.
It has been switched to the side.

First, assume that the video switcher 104 is, for example, the video switcher 104A shown in FIG.

In the above configuration, the changeover switch 106 is switched to the contacts a and c as shown in the figure, and the control code (PA 1
, PAO) is output to the data input terminals Di and D2 of the latch circuit 108, and the strobe signal 5
It is latched by the latch circuit 108 at the falling edge of TROBH. Data launched here (PAL, PAO)
is, for example, "11", the data rl IJ (G1=G2=
1) is output. As a result, the video signal VD3 from the video signal reproducing device 10 of 11h3 is selected by the data multiplexer 112, and is output from the terminal E via the amplifier 114 to the outside from the terminal T4. Here, the video switcher 104 is the same as the video switcher 104A in FIG.
In this case, the video switcher 104
Video switcher 104 from terminal T4 as B's one-man power
Output to B.

Next, the video switcher 104
The case where it functions as B will be explained. In this case, the changeover switch 106 is switched to the d side. Also, from terminals T0 to T, data multiplexer 1
Video signals VDO to VD3 input to terminals A-B of 12
In FIG. 4, each switcher 10 of Na0-11h3
4A means the video signals selected from the video signal reproducing devices 10 of groups A to D, respectively. That is, to quote the example mentioned above, the control code PA
If L, PAO is P^1=PAO=1, then 隘O～隘3
The video signals of the third video signal reproducing apparatus 10 in groups A to D are selected by the switchers 104A and output to the switcher 104B. This video signal is V
In the above case corresponding to DO-VD3, a data signal indicating the control code (PA3, PA2), for example, 2-bit data of PA3=1, PA2=0, is input to the launch circuit 108 via the changeover switch 106. Then, the data “OIJ
(G1=O, G2=1) is output. As a result, the video signal VD selected by the switcher 104A of unit 2
2. In other words, the video signal VD2 of the third video signal reproducing device 10 that succumbs to group C is transferred to the data multiplexer 1.
It is output from the terminal E of the computer 1 to the CRTloo in the computer 1 from the terminal T4 via the amplifier 114, and the CRTloo
Desired guidance information will be sequentially displayed on the screen of o.

FIG. 7 shows a specific configuration of the video signal reproducing device 10. As shown in FIG. FIG. 8 is a timing chart showing the operation of the video signal reproducing device 10.

A video signal reproducing device is a device that reproduces video signals recorded on a magnetic disk. A magnetic disk has a plurality of (for example, 50) tracks (for example, a track pitch of 10).
0μm) are provided in a circular pattern, and each track has one
A field's worth of FM-modulated color video signals (including coating signals, chroma signals, etc.) are magnetically recorded. A magnetic reproducing head for reading these video signals is movable in the radial direction of the magnetic disk, accesses a designated track, and reads the video signal of that track from the rotating magnetic disk.

A control device 30 provided in the video signal reproducing device 10 reads the states of various switches including the forward switch 16 and reverse switch 17, performs forward and reverse processing including tong/door tong control to be described later, and performs video signal processing. It performs playback control, warning processing, etc., and is connected to a central processing unit, preferably a microprocessor (hereinafter referred to as CPU), a memory that stores its programs and necessary data, and peripheral elements, circuits, devices, etc. It consists of an interface. The control device 3o is also provided with a counter CN for counting the position of the magnetic head, that is, the number of tracks. A predetermined area of the memory may be used as the counter cN.

The device is provided with a forward switch 16 for inputting a command to send the magnetic head 12 from the outside to the inside of the magnetic disk 11 by one trunk, and a reverse switch 17 for sending the magnetic head 12 in the opposite direction. a load switch that detects that the openable/closable bucket is closed and locked; a puncture switch that detects that the magnetic disk 11 is housed in the closed bucket; and a home position switch (described later). (both are illustrated), correction key 1 provided on the operation panel 102
52, menu call key 156, repeat play key 15
8 and other switches (paths shown) are connected to the controller 30 and their on/off states are read in the key scan routine. A warning indicator light (illustrated path) is also provided, and is turned on by a display command from the control device 30 when a predetermined condition is met.

The terminal ① of the control device 30 is for outputting a key scan pulse, and one pulse is output for each revolution of the magnetic disk 11 at the timing shown in FIG. The above-mentioned forward squirrel inch 16 and reverse feed switch 17 are connected to this terminal H via backflow prevention diodes 26 and 27, respectively. In addition, a correction key 152, a menu call key 156, and a repeat playback key 1 are connected to terminals 40, 41, and 42 through backflow prevention diodes 40, 41, and 42, respectively.
58 are connected. These switches 16.17,
The keys 152, 156, 158 are connected to input terminals A1, A2, B1-B5 of the control device 30, respectively. If the switch 16 is on when the key scan pulse is output, the terminal AI will be at a high level for the duration of this pulse width, so the control device 30 recognizes that the forward switch 16 is on. When switch 17 is turned on, a pulse appears at input terminal A2.

This input terminal A2 is used for inputting a reset signal, and when this terminal A2 becomes low level, the control device 30 recognizes that a reset signal has been input.

Similarly, by checking the state of the signal level at terminal B1-83? 111 device 30 has key 152.
156.158 status can be recognized. These terminals A1, A2, B1-B5 are normally in a floating state.

Terminal H and input terminals AI and A2 of the control device 30 are connectors provided in the video signal reproducing device 10 for connection to the interface 50, such as terminals H and A of a socket 39A.
It is also connected to I, A2, and B1 to B3.

Magnetic disk 11 is mounted on the spindle of disk motor 21 when it is contained within the packet and the packet is closed and locked. A magnetic reproducing head 12 is disposed so as to be movable in the radial direction of the magnetic disk 11 in contact with the magnetic recording surface of the magnetic disk 11 . In addition, the core of the magnetic disk 11 detects a magnetic material provided in the core, and the magnetic disk 11
It is adjoined by a phase detector 13 which generates one pulse (indicated by PG in FIG. 6) for each revolution of .

The disk motor 21 is provided with a frequency generator 22 that generates a signal with a frequency proportional to its rotational speed, and its output frequency signal is fed back to the servo control circuit 23. Further, the detection pulse PC from the phase detector 13 is also input to the servo control circuit 23 and the control device 30. The reference clock pulse generator 24 generates a reference signal of 6011□, which is the same as the field frequency of the rask scan video signal recorded on the magnetic disk 11, and sends this to the servo control circuit 23. A clock pulse of, for example, 3.58 MHz is provided. Based on these input signals, the servo control circuit 23 controls the disk motor 21 at a constant rotation speed, for example, 3600 r.
, p, m, and are controlled to rotate at a constant speed.

Further, the motor 21 is started and stopped in accordance with commands from the control device 30.

The magnetic head 12 is supported so as to be movable in the radial direction of the magnetic disk 11 by a movement drive device including a step motor 14, and is controlled to be moved in the same direction. magnetic head 12
The control of the step motor 14 for transferring will be described later, but this step motor I4 is equipped with a drive circuit I
5 gives 41 [IASA, B, B drive pulses. The direction of rotation of the step motor 14 determines the direction of movement of the magnetic head 12, and the distance of movement of the magnetic head 12 is proportional to its rotation angle. For example, step
This motor rotates approximately 18 degrees per motor shift pulse (hypothetically generated for each phase change of the drive pulses described above), which causes the magnetic hand 12 to rotate approximately 18 degrees.
is transferred approximately 5 μm. Therefore, 20 shifts/
A pulse causes approximately one track (100μ111) of transport.

The magnetic head 12 reads the video signal recorded on the track on the magnetic disk 11 at the positioned position. In this embodiment, the magnetic disk 11 is 3600r
Since it rotates at a constant speed at , p, m, one track of video signal, that is, one field of F, is generated every 1/60 second of one rotation.
The M modulated video signal will be reproduced from the magnetic head 12. This is demodulated to be compatible with standard color television systems such as the NTSC system.

The reproduced output of the magnetic head 12 is sent to a video signal processing circuit 34 and an envelope detection circuit 32 via a preamplifier 31. The video signal processing circuit 34 processes the video signal read by the magnetic head 12 and outputs it as a composite color video signal in, for example, NTSC format. More specifically, the video signal processing circuit 34 includes a luminance signal processing circuit 34A, a color signal processing circuit 3' 4B, and a synthesis circuit 34C that synthesizes the outputs of these circuits.

The luminance signal processing circuit 34A is for adapting the luminance component and synchronization signal component of the video signal reproduced by the magnetic head 12 to the NTSC format.

This circuit 34A also receives a vertical synchronization signal VS from the video signal.
'YNC is extracted and supplied to the control device 30, and when the signal MUTE is received from the control device 30, the scanning period of the video signal is set as a blank signal, and a muting operation is performed. The timing of the vertical synchronization signal VSYNC is shown in FIG. 8, which also shows the horizontal synchronization signal.

The color signal processing circuit 34B is a circuit that demodulates the color signal component of the video signal and also performs balanced modulation and color burst superimposition to conform to the NTSC format. This circuit 34B receives a vertical 4M line erase signal l3LK and a burst gate signal BG from the control device 30.
is given. The circuit 34B controls whether or not to superimpose the color burst signal on the composite color video signal in accordance with the burst gate signal BG.

That is, in a steady state in which the magnetic helad 12 is on-track on a predetermined track of the magnetic disk 11, the control device 30 performs a predetermined control based on the phase synchronization pulse PG, as shown in FIG. A vertical blanking signal BLK and a burst gate signal BG are generated and output at timing. When the burst gate signal BG is applied to the circuit 34B, the color burst signal is not superimposed on the bank porch of the horizontal synchronizing signal of the image No. 18.As will be described later, the forward and reverse feed control of the magnetic helad 12 is performed. (
When tracking control is being performed, the burst gate signal BG is not output from the control circuit 30.

At this time, as will be described later, the signal BG is held at low level and the signal BLK is held at high level (see FIG. 8).

The burst gate signal BG is also sent to the terminal A3 of the connector 39A for connection to the interface 50.

The luminance signal and color signal outputted from the circuits 34A and 34B described above are combined by a combining circuit 34C to form a composite color video signal in NTSC format, which is sent from an output terminal 48A to the CRTloo via the video switcher 18.

In FIG. 8, H represents the time from the beginning of one (horizontal) scanning line to the beginning of the next scanning line, and ■ represents the time from the beginning of one field to the beginning of the next field.

The color video signal output from the video signal processing circuit 34 is sent to the CRTloo, and the video signal recorded on the magnetic disk 11 is visually displayed on the screen of the CRTloo. If necessary, the control device 30 also sends a signal indicating the current value of the counter CN, that is, the current position of the track, to the CRT 100, and the envelope detection circuit 32, which also displays the track level on the screen, detects the magnetic head. 12
This is a detection circuit that detects the envelope of the read signal, that is, the FM modulated video signal recorded on the track of the magnetic disk 11, and outputs a voltage signal corresponding to the envelope. The voltage signal representing the envelope is analog/
The signal is sent to a digital converter (A/D converter) 33, converted into an 8-bit digital signal representing, for example, 256 quantization levels, and input to the control device 30.

The envelope detection signal is used to search for tracks on the magnetic disk 11. When the magnetic head 12 is moved in the radial direction of the magnetic disk 11, the position where the detected signal shows a peak is the center of the trunk where the video signal is recorded. The control device 30 controls the magnetic head transport drive device described above based on the input 8-bit digital signal, and positions the magnetic head 12 at the center of a predetermined track. This is called tracking control.

FIG. 9 shows the relationship between the tracks provided on the magnetic disk 11 and the home position HP (original position or standby position) of the magnetic head 12. Fifty tracks are provided concentrically on the magnetic recording surface of the magnetic disk, and the tracks are numbered 1 to 50 in order from the outermost track.

Home position HP is outside Nll's trunk. This home position HP is not attached to the magnetic disk 11, but is an extreme position assigned on the movement path of the magnetic head 12. Baum position HP is detected by the home position switch mentioned above. The movement of the magnetic head 12 from the outside to the inside of the magnetic disk 11 is forward feeding, and the movement in the opposite direction is called reverse feeding.

Next, among the operations of the video signal reproducing device 10, initial tracking processing, forward control control, and reverse control processing related to control by the computer 1 will be described.

In the initial tracking process, first, the magnetic head 12 is returned to the home position HP, and the magnetic head 12 is moved in the forward direction from this home position HP, while searching for the center of the track in the trunk space 1. The magnetic head 12 is positioned at the center of the track. As a result, the count value of the track number counter CN is initialized to one. Initial tracking processing is performed when a power switch is turned on, when a reset signal is input, etc.

FIG. 10 conceptually shows an overview of forward and reverse processing and tracking processing. As described above, the control device 30 outputs key scan pulses at a constant cycle and outputs a forward signal (switch 16), reverse feed signal (switch 17), and other switch states are detected.

As a result, a progressive signal (indicated by FW in Figure 8)
When it is detected ("YES" is determined in step 121 and the first key scan after time tl in FIG. 6), the following forwarding and tracking processing is performed.

If the value of the trunk load counter CN is not 50 (No" in step 131), the tracking flag is set to 1 cent (step 132), and the magnetic head 12 is transferred in the forward direction to near the center of the adjacent track. , a change in driving pulses corresponding to 11 shift pulses in the forward direction is applied to the step motor 14 (step 133).

At this time, the output of the envelope detection circuit 32 is read. This reading is performed, for example, nine times, and the average value is calculated. , followed by one more forward shift pulse and sensing the envelope level in the same way. Previous and current envelope levels (
If there is no significant difference in the above-mentioned average value, the envelope in the vicinity is changed while the transport direction of the magnetic head 12 is switched between forward and reverse directions.

After searching the level many times and confirming that there is no significant difference between the respective envelope levels, that position is determined to be the center of the track, and the magnetic head 12 is positioned there. If there is a significant difference between the previous and current envelope levels, the magnetic head 12 is further moved by one shift pulse toward the higher envelope level, and the same process is repeated. This is the tracking control process in step 114. The tracking control process ends at time t2 in FIG.

However, if the envelope level is below a predetermined threshold level, it is determined that no video signal is recorded on that track.

Finally, the tracking flag is reset to O (step 135), and the value of l-rack No. and counter CN becomes 1.
(step 136).

If the values of the track number and counter CN have reached 50, sequential forwarding is impossible, and the above-mentioned warning process is performed by lighting up the warning indicator light, sounding the buzzer, etc. (step 137).

If a reverse feed signal is detected (step 122 “
YES"), a process similar to that described above for the reverse direction is performed (steps 142-145). The counter CN is decremented by l (step 146).
). Further, if CN=1, a warning process is performed (steps 141 and 147).

During such forward or reverse processing (including tracking control processing), that is, when the tracking flag is 1
(in FIG. 6, from the first key scan after time tl to time t2), the vertical blanking signal Wτ is at a high level and the burst gate signal BG is at a low level. Each level is maintained.

Also in the above-mentioned initial tracking process, the burst gate signal BG is held at a low level during the tracking process, and when the magnetic head 12 is positioned on the track No. 1, the magnetic head 12 is placed on the magnetic disk.

It becomes high level only for a predetermined period every rotation of 11.

Next, FIG. 11 shows the contents of the menu display processing routine. In the figure, by operating various keys provided on the operation panel 102 on the front of the computer 1's case,
First, a menu is displayed on the RTloo screen (step 200).

On the other hand, as described above, a key scan pulse is outputted from the terminal H of the control device 30 at regular intervals, and a key scan is performed to determine the states of various switches and keys.

(Step 202). If the key operated after the menu is displayed in step 200 is the correction key 152, the process returns to step 202; otherwise, the process proceeds to step 206 (step 204). A determination is made as to whether the operated key in step 206 is the menu call key 156 or not. If it is determined in step 206 that the menu call key 156 has been operated, the process returns to step 200 and the menu display is displayed again.

On the other hand, if the key created in step 206 is not the menu call key 156, the process further advances to step 208;
A determination is made as to whether the operated key is the repeat playback key 158 or not. If it is determined in step 208 that the repeat playback key 158 has not been operated, the process advances to step 210 and the already specified guide information is
A predetermined video signal reproducing device 10 is accessed via the interface 50 in order to display the video signal on the display screen of the video signal, and the process returns to step 202.

On the other hand, if it is determined in step 208 that the operated key is the repeat playback key 158, the process proceeds to step 212, where specific image information is repeatedly reproduced and displayed on the display screen of the CRT 100, and the process proceeds to step 214. Further key scanning is performed in step 214, and in the next step 216 it is determined whether the menu call key 156 has been operated. If the menu call key 156 is not operated in step 216, step 21
Returning to step 2, the same process is repeated. Also step 21
If it is determined in step 6 that the menu call key 156 has been operated, the process returns to step 200 and the menu is displayed again.

Next, Figure 12 shows the configuration of the interface, and Figure 13 shows the interface configuration.
An example of the operation is shown in the figure.

In these figures, a strobe signal 5TROBB is sent from the computer 1 or the previous stage interface 50.
and data signals (control codes PAO to PA7
) is sent and goes to the next interface.

A busy signal BUSY or a ready signal 2 is transmitted from the subsequent interface to the previous interface and the computer 1.

In the circuit shown in FIG. 12, a control signal generating circuit 60 that generates forward, reverse, and reset signals, and a circuit that generates a busy signal BUSY from the burst gate signal BG are shown in some detail.

A part of the control signal generation circuit 60 will first be explained in order to clarify the connection relationship with the video signal reproducing device 10.

The connector, for example plug 39B, is connected to the video signal reproducing device l.
It is connected to connector 39A of O. Switch 66 is turned on by a forward signal decoded and generated from control bits PΔ6 and PA7. This switch 66 is connected between the terminals H and A1 of the connector 39B via a backflow prevention diode 76. The switch 67 is controlled by a reverse signal decoded and generated in the same manner. This switch 67 is connected via a diode 77 between the terminal I (and A2 of the connector 39B).
are connected to each other, the switch 66 is in parallel with the forward switch 16, and the switch 67 is in parallel with the reverse switch 1.
7 in parallel with each other. The switches 66, 67 can be analog switches, semiconductor switching elements, or other switching elements.

Therefore, if the above-mentioned key scan process is performed in the video signal reproducing device IO while the switch 66 or 67 is on, the control device 30 in the device IO will act as if the forward switch 16 or reverse switch 17 were on. It is recognized as if it were there, and the above-mentioned forward processing or reverse processing is performed.

A transistor 64 is connected between terminal A1 of connector 39B and ground. This transistor 58 is N
It is turned on by a high level reset signal generated by the OR circuit 63. When the reset signal is output, the transistor 64 turns on, and the connector 39A
, 39B, the input terminal Al of the control device 30 of the video signal reproducing device 10 becomes low level, and the control device 30 recognizes the reset process.

In this way, it is possible to start forward, backward, and reset processing of the video signal reproducing device 10 based on an external input, that is, a command from the computer 1.

Now, the interface 50 connected to each video signal reproducing device 10 has the device number of the corresponding device 10, (0 to
15) is provided. This setting device 71 is composed of, for example, four dip switches, and its 4-bit setting output is input to a comparison circuit 72. The comparison circuit 72 includes the lower four of the data buses.
Bift PAO to PA3 lines are also connected. Therefore, when the control code data is placed on the data bus, when the device number represented by the lower 4 bits PAO to PA3 matches the device number set in the setting device 71, the comparison is performed. A high level match output is generated from circuit 72 and sent to one input of NOR circuit 73.

The other input side of the NOR circuit 73 has the fifth bit PA4.
lines are connected. Therefore, when a coincidence output is generated from the comparison circuit 72 or when PA4=1, N
The output of the OR circuit 73 becomes low level. This applies when this device is specified by the lower 4 bits, or when all devices are specified by the 5th bit. The output of the NOR circuit 73 is a corresponding device designation signal, indicating that the computer 1 is accessing.

The output of the NOR circuit 73 is input to one input side of the NOR circuit 74, and the strobe signal 5TROBB is input to the other input side of the NOR circuit 74. Therefore, N
When the output of the OR circuit 73 becomes low level and the strobe signal 5TROBB falls to the low level, a positive pulse is generated from the NOR circuit 74, and the trigger input terminal A of the one-shot multivibrator 61, 62 and the subsequent Clock input terminal C of flip-flop 83.91 to be described
Sent to K.

The operation disabling (chip disable) terminal CD of the one-shot multi-by-break 61 is connected to the line of one bit PA6 of the upper two bits. When this bit PA6 is 1, this chip is operational. Therefore, when a positive pulse is input to the trigger input terminal A when bit PA6 = 1 (forward or reset), a positive pulse for a certain period of time, for example, about 50 ms, is output from the positive output terminal Q of the multi-by-break 61, and the inverted output is A negative pulse is generated from each terminal Q.

Terminal C of the other one-shot multi-by-break 62
Since bit PA7 is input to D, PA7=1
When a positive pulse is input to the trigger input terminal A during (reverse feed or re-cent), a positive pulse is output from the output terminal Q, and a negative pulse is output from the output terminal Q.

In the case of a sequential feed command, that is, PA6=1 and P7=0, approximately 5
Since a positive pulse of 0 ms is generated, the switch 66 is turned on only during this period. The ON state of the switch 66 is read by the key scan of the device 10 being performed at this time, and the video signal reproducing device 10 starts forward processing. As a result, the burst gate signal BG that has been generated until now is stopped. This situation is shown in FIG. 13(A).

When PA6=0 and PA7=1, a positive pulse of about 50 ms is generated from the positive output terminal Q of the multi-by-break 62, and the switch 67 is turned on only during this period. Therefore, the video signal reproducing device 10 starts reverse feed processing. 1st
See Figure 3 (B).

When PA6=PA7=1, a positive pulse is generated from the positive output terminal Q of both multi-by-breaks 61 and 62,
Both switches 66 and 67 are turned on. On the other hand, negative pulses (low level) are generated from the inverting output terminals Q of these multi-by-breaks 61 and 62. Since these terminals Q are connected to the input terminal of the NOR circuit 63,
The output of the NOR circuit 63 becomes high level, and the transistor 64 is turned on. As a result, the terminal At is forced to a low level.

The control device 30 of the video signal reproducing device 10 has terminals AI, A
2, the state in which the terminal AI is at a low level is given top priority over any other state. Therefore, when the terminal AI becomes low level, the control device 30 recognizes the input of a reset signal and starts a reset command, that is, initial tracking processing (see FIG. 13(C)).

When the positive pulse output from the NOR circuit 74 is input to the clock input terminal CK of the D flip-flop 83,
Since its D input is always at a high level by the power supply (+V) via a jumper 85, this D flip-flop 83 is set and its output Q becomes a high level. This high level output Q is sent as a busy signal BUSY to the computer 1 and the preceding interface 50 via the OR circuit 84 (see FIG. 13).

As described above, the corresponding operation is started in response to the forward, reverse, or reset command, and the busy signal BUSY rises to prohibit access to the computer 1.

Busy 4g No.BuSY for all interfaces 50
are connected by an OR circuit 84, so if any one device is busy, computer l cannot access any device.

If it is desired to inhibit the generation of a busy signal for a particular device, or for all devices, the jumper 85 between the data input terminal of flip-flop 83 and the high level power supply can be disconnected. In this case, the sending of a busy signal is prohibited and the ready signal surface η■ state is always maintained, so that after issuing a command to a specific device or all devices, the computer 1 can issue a command to a specific device or all devices, and then enable the device to perform the specified process. It is necessary to wait a sufficient amount of time for the processing (such as sequential forwarding) to be completed.

The busy state is canceled by forcibly resetting the flip-flop 83 (terminal R) using the output of the NOR circuit 82. In principle, this release is performed at the connector 39.
This is done by detecting the rise of the burst gate signal BG inputted through the terminal A3 of the terminal A3 by the differentiating circuit 81. The detection signal of the burst gate signal BG is output as a low-level pulse from the differentiating circuit 81,
The signal is input to the NOR circuit 82. Other 3 of NOR circuit 82
If both inputs are low level, the NOR circuit 82
Since a high-level pulse is output from the flip-flop 83, the flip-flop 83 is forcibly reset, and its positive output Q falls to a low level (see FIG. 13). That is, when the forward feed, reverse feed processing or initial tracking processing is completed in the video signal reproducing device IO, the burst gate signal BG is generated as described above, so that the busy signal B is generated as described above.
UsY goes low and ready signal 11EADY goes high. From here on, computer 1
can access the device 10.

Conditions based on the other three inputs of the NOR circuit 82 are as follows. That is, the flip-flop 83 is once turned on, and its inverted output Q is at a low level.

This means that a busy signal has already been generated. Also, one shot multi-by break 61 and 6
2's positive output Q has already fallen to a low level. This means that the above-mentioned 50 m5, which is the setting time of this multi-bye break 61.62, has already elapsed.

In this embodiment, the busy signal BUSY is sent from the interface 50 to the computer 1 only during a period when the video signal reproducing device IO connected to the interface 50 is performing specific processing such as controlling the feed of the magnetic head 12. However, without limitation,
For example, regarding the period required for the interface 50 itself to decode input data, the busy signal [I
The computer l, which may be configured to output USY to the computer l side, is capable of performing various controls. It is preferable that the memory of the computer 1 stores the positions of the magnetic heads of all the video signal reproducing devices 10, that is, the current position track numbers.

In the initial process, computer 1 connects all devices 1
0 to cause all devices 10 to perform initial tracking. Also, the current position track numbers of all the devices 10.

Set to 1. In such a process targeting all devices 10, all devices can be specified by the fifth bit PA4, so all devices can be controlled in one process.

When setting a predetermined track number to a specific device 10, a forward feed command or a reverse feed command may be repeatedly given to that device 10. For example, if the current position track number of a certain device 10 is 10, and if this is to be accessed up to trunk number 15, the sending of the forward command is repeated five times. That is, first, when the first sequential feed command is sent, the device enters a busy state, so wait until this busy state is released before sending the second sequential feed command. When this process is repeated five times, sequential feeding has been performed five times on the device 10 side, and the magnetic head I2 of the device 10 is positioned at track No. 15.

〔Effect of the invention〕

As explained above, in the present invention, in an image information display device that selectively extracts various image information based on input information and displays it on a display screen, specific image information is repeatedly reproduced and displayed on the display screen of the display means. When an instruction to display a menu for selecting desired image information is issued from the input means while the image information is being displayed, the repetitive playback operation is stopped and the menu is displayed. According to the present invention, desired image information can be obtained immediately without waiting time.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the basic configuration of an embodiment of an information system to which the present invention is applied; FIG. 2 is a perspective view showing the external appearance of a computer constituting the information system to which the present invention is applied; Figure 3 is the second
FIG. 4 is a block diagram showing the configuration of main parts of another example of the information system to which the present invention is applied; FIG.
6 is a block diagram showing the specific configuration of the video switcher in FIG. 4, and FIG. 7 is a block diagram showing the specific configuration of the video signal reproducing device in FIG. 1. 8 is a timing chart showing the operation of the video signal reproducing device, and FIG. 9 is a TIj!
FIG. 10 is a flowchart showing part of the processing procedure in the video signal reproducing bag; FIG. 11 is a flowchart showing the contents of the menu display processing routine; FIG. 12 is a circuit diagram showing a specific configuration of the interface in FIG. 1, and FIG. 13 is a timing chart showing the operation of the interface. DESCRIPTION OF SYMBOLS 1... Computer, 10... Video signal reproducing device, 50... Interface, 100...
・CRT, 102...operation panel, 104・
...Video switcher, 152...Correction key,
156...Menu call key, 158...Repeat play key. HP no.

Claims (1)

[Claims] An image information display device that selectively extracts various image information based on input information and displays it on a display screen, comprising: a plurality of video signal reproducing means for reproducing various image information; and a desired image. input means for selecting information and specifying a display mode; display means for displaying specified image information on a display screen; control means for accessing specific or all of the video signal reproduction means and sending desired image information to the display means; If an instruction to display a menu for selecting guidance information is issued by the input means while the guide information is being displayed on the display screen, the repetitive playback operation is stopped and the menu is displayed. Image information display device.