JPS6058524B2 - How to record and play back magnetic disks - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, when a plurality of slave units are connected to one base unit and a data signal for searching is sent from the slave unit to the base unit, the target video signal is transmitted to the slave unit. This is a magnetic disk recording and reproducing method in which a magnetic disk is sent, temporarily recorded by a slave device, and then reproduced again.

Originally, when searching for road guidance to a destination, maintenance guidance for buildings or machinery, etc., there may be different points to be searched even on the same map.

In such a case, it has been desired that different data on the same map can be easily converted into character signals, combined, and reproduced by commands from a plurality of slave devices. The present invention was made in response to such demands, and the base unit includes a magnetic disk having a plurality of tracks on which video signals are recorded in a randomly accessible manner and fixed tracks on which data signals are recorded. However, when the data signal from the slave unit is sent to the base unit, a signal that is a composite of the video signal and data signal on the magnetic disk is sent to the slave unit, and the slave unit temporarily stores this signal on the fixed track of the magnetic disk. In this method, the data is recorded and then played back. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a magnetic disk, and the outermost circumference of the magnetic disk 1 is provided with one or more fixed tracks 2 for recording and reproducing data signals as described below.

The fact that this data track 2 is fixed means that the magnetic head 3 shown in FIG. 5 or FIG.
This means that a fixed number of lines are provided.
All inside this data track 2 are video tracks 41 to 4n, which directly record and reproduce video signals as analog values, and are composed of a plurality of randomly accessible tracks (for example, n 256 channels). There is. The positions of the magnetic heads 5 of the video tracks 4, .about.4n are selectively controlled by a moving device 6, as shown in FIG. 5 or 7. Second
Figure a is an enlarged view of the data signal in the data track 2 when indicating, for example, the position of an average number of places on one map.One data signal consists of, for example, 190 bits, and the numbers range from "0001" to R256OJ. have been divided up to.

Figure 2b shows a further enlargement of this 1 data signal.From the top, 5 bits for start, 160 bits for name (1
8-bit character (2 characters), channel (or page)
It consists of a total of 190 bits: 8 bits for number, 10 bits for position, 2 bits for check, and 5 bits for blank.

Therefore, one data track is 190 (bits) x 256 (channels) = 486.4
It becomes kilobit. FIG. 2c shows video signals in the video tracks 41 to 4n, with one track having one
A field or one frame, that is, one screen is stored.

FIG. 2d shows a signal waveform of a 1H (horizontal scanning) period which is further enlarged, and VS indicates a video signal, that is, a horizontal synchronizing signal.

FIG. 3 shows the relationship between the base unit 7 and the slave unit 8 used in the method of the present invention.

The video signal output terminal 9 of this base unit 7 is connected to the video signal output terminal 9 shown in FIG.
The video signal and data signal are already combined and output. Further, a data signal for search from the handset 8 is inputted to the data signal input terminal 10 of the base device 7 . The video signal input terminal 11 of the slave unit 8 is connected to a fixed video magnetic head 17 via a modulator 12, a recording amplifier 13, and contacts 15 and 16 of a changeover switch 14, and is connected to a fixed video magnetic head 17, and is servo controlled by synchronous separation. magnetic disk 2 via the motor drive amplifier 19
It is connected to the rotation motor 20 of No. 8.

The other contact 21 of the changeover switch 14 is connected to a video monitor television 24 via a preamplifier 22 and a demodulator 23. Further, inside the handset 8, there is a keyboard 25 for keying in data such as a name to be searched,
A code generator 26 for encoding this is provided, and is coupled to the data signal input terminal 10 of the base unit 7 via a data output terminal 27. Next, the operation of the present invention will be explained.

Assume that, for example, RABCBANKJ is keyed in as the information to be searched on the keyboard 25 of the handset 8.

The code is then coded by the code generator 26 and sent to the base unit 7. At the base unit 7, the target video signal (map) and data signal (name, position) are combined and sent to the terminal 9.
11, and is sent to the slave unit 8.

Then, a synchronizing signal is separated from this video signal by the servo controller 18 and sent to the motor 2 via the motor drive amplifier 19.
0 at a predetermined speed. At the same time, the video signal is modulated by a modulator 12, a recording amplifier 13, a changeover switch 1
4 and is supplied to the head 17. Then, one field or one frame, that is, one screen, is recorded on a fixed track of the magnetic disk 28, that is, on one track. Immediately after the recording is completed, the selector switch 14 is switched, and the magnetic head 17 reads out the data, which is read out by the preamplifier 22.
An image in which the map, name, and position are combined is displayed on the video monitor television 24 via the demodulator 23. In this way, the handset 8 temporarily transfers the information retrieved from the base unit 7 to the magnetic disk of the handset 8 as needed.
8 and play it back.

This means that if there is one base unit 7, a plurality of slave units 8 can be connected to it in parallel.

Next, the master unit 7 can use a reproduction-only device in which information is recorded in advance on the magnetic disk 1 as shown in FIG. It is also possible to use a device that records and plays back.

The reproduction order of the reproduction-only device shown in FIG. 5 will now be explained in detail.

(1) The data track 2 is scanned by the data magnetic head 3, the name code is kept in a constant reproduction state, and the output signal is read out and sent to the decoder 30 via the read amplifier 29.

Details of this decoder 30 are shown in FIG.

(2) When the name to be searched is keyed in on the keyboard 31 of the base unit 7 or the keyboard 25 of the slave unit 8, the name is sent from the code generator 32 of the base unit 7 or the code generator 26 of the slave unit 8 to the decoder 30.

(3) The decoder 30 separates the reproduced data output from the readout amplifier 29 into a code, the separator 33 separates it into a name code, position code, and channel (number of pages) code signal, and the match circuit 34 separates it into the name code signal. A matching relationship with the keyed-in name code signal is detected.

(4) When the contents of the name code match, the match circuit 34
An output is output from the mode controller 37 to turn the switches 35 and 36 ON, and a control signal is sent from the mode controller 37 to the selector switch 38.

Note that if there is no match, the search continues on the data track until a match is found. (5) Switch 36
With 0N operation, the channel (page number) code signal is
The signal is sent to a drive amplifier 40 via a channel selection controller 39 to drive a motor 41.

At the same time, the point of the display object (
A character adder 42 adds a shape to be displayed (for example, a mouth, an O, etc.) to the position code signal that determines the name position, and a position data adder 43 adds the name display position to the name code. Position data is added and these are added to adder 44. (6) A code signal indicating the position and character is written into the RAM-45 via the changeover switch 38.

(7) The video signal is reproduced by the magnetic head 3 and sent to the sync separator 48 via the preamplifier 46 and demodulator 47,
A synchronization signal synchronized with the reproduction signal is generated.

(8) Switch the contacts of the changeover switch 38 as shown in the figure.

(9) As a result, a code signal indicating the position and character is sent from the RAM 45 to the clock generator 4.
9, the signal is read out under the control of 9, and sent to mixer 52 via character generator 50 and video processor 51. (10
The mixer 52 mixes the reproduced video signal (original image) and the character signal (guide image) and sends the mixed signal to the handset 8 and the video monitor television 53.

Then, on the video monitor television 53, the name is written on the target map, and the target position is displayed in a conspicuous manner. Next, the operation of the recording/reproducing apparatus shown in FIG. 7 will be explained. Explain the recording order. (1
) Information to be recorded using the keyboard 31 or 25 of the base unit 7 or slave unit 8 (hereinafter referred to as road guide map)
Key in the number of channels (number of pages) for.

This allows the coded signal from code generator 32 or 26 to be transmitted to encoder/decoder and controller 30.
a changeover switch 37a to channel selection controller 39
Then, the motor 41 of the moving device 6 is driven via the drive amplifier 40 to move the magnetic head 5 to a predetermined position (channel) on the video track. The encoder/decoder and controller 30a is connected to the decoder 30 shown in FIG.
A line for sending the input signal from 2 to the adder 65, and a line for sending the input signal to the channel selection controller 39 via the changeover switch 37a are added. 2) When the map 55 is photographed by the television camera 54, the video signal is frequency-modulated by the modulator 56 and sent to the recording amplifier 57.

The contact of the changeover switch 58 is switched to the opposite side in the figure, so that a video signal is sent to the magnetic head 5.

At the same time, a signal is sent from the television camera 54 to a servo controller 59, which rotates a disk motor 61 via a motor drive amplifier 60. 3) Repeat the operations (1) and (2) above to record all the maps 55--necessary for guidance on the predetermined video tracks 41-4n.

4) Next, data is recorded on all maps 55-.

To do this, first, the name of a certain point on the map 55 (hereinafter referred to as R, ABCBANKJ (bank)) and the number of channels are keyed in.

The keyed-in signal is sent via code generator 32 to encoder/decoder and controller 30a.

Drive the motor 41 with a signal corresponding to the number of 2 channels,
The magnetic head 5 searches for predetermined video tracks 41 to 4n.

3. The playback video signal from the searched video track is
Only the screen shown in FIG. 4a is displayed on the video monitor television 53 via the changeover switch 58, preamplifier 46, and demodulator 47.

5) The signals from the demodulator 47 are simultaneously sent to the sync separator 48, and the horizontal sync signal D and vertical sync signal D are sent to the clock generator 49.

As a result, the clock generator 28 constantly supplies a signal indicating the address on the scanning line to the position code generator 62 in synchronization with the input signal.

(6) When the code signal indicating the name input from the code generator 32 to the encoder/decoder and controller 30a is sent to the position adder 43, it becomes a position code signal indicating the display position of the name in the image. The signal passes through the adder 44 and is output from the signal output terminal.

This output signal is written and stored in the RAM 45 via the changeover switch 38. (7) The switch 38 returns to its original state (the state shown), and R
The name code is read from the AM 45 and added to the character generator 50, whereby a character signal with the name RABCBANK is output from the video processor 51.

(8) The reproduced video signal and the character and signal indicating the name are mixed in the mixer 52, and the video monitor television 53
The name is added to the image as shown in Figure 4b.

(9) Touch the ABC bank position with the light pen 63 and turn on the switch 64.

As a result, when the scanning line reaches the contact position of the light pen 63, it is output. [Phase] This coincidence output is sent to the adder 65. (11) Encoder/decoder and controller 3
Since the name code and channel code signals are output from 0a, the adder 65 adds the position code signal to the complete coded 1.
A data signal is created that conveys the same information. (12) As a result, the changeover switch 66 is temporarily switched, and the signal from the write amplifier 67 is recorded on the data track 2 via the magnetic head 3.

(13) When recording is completed, the selector switch 66 is returned to the reproduction side, and the data is reproduced and checked as shown in FIG. 4c.

First, the playback order will be explained. (1) The data track 2 is scanned by the data magnetic head 3 to constantly reproduce the name code, and the output signal is sent to the encoder/decoder and controller 30a via the changeover switch 66 and readout amplifier 68.
I'll send it to you.

(2) When the name to be searched is keyed in on the keyboard 31 or 25 of the base unit 7 or slave unit 8, a coded signal is sent from the code generator 32 or 26 to the encoder/decoder and controller 30d.

(3) In the encoder/decoder and controller 30a, the reproduced data output from the read amplifier 29 is separated into name code, position code, and channel code signals by the code separator 33 in FIG.
4, it is determined whether the code signal matches the keyed-in name code signal.

4) When the contents of the name codes match, the matching circuit 34 outputs an output to turn on the switches 35 and 36, and the mode controller 37 sends a control signal to each selector switch 38, 58, 66 and the position code. The signal is sent to the generator 62.

Note that if there is no match, the search continues on the data track until a match is found. 5) When the switch 36 is turned ON, the channel code signal is sent to the drive amplifier 40 via the channel selection controller 39 and is sent to the motor 41.
to drive. At the same time, the character adder 42 adds the shape to be displayed (for example, a mouth, an O, etc.) to the position code signal that determines the point (position) of the display object by the ON operation of the switch 35, and the position data adder In step 43, position data that determines the display position of the name is added to the name code, and these data are added to the adder 4.
Added to 4. 3) The code signal indicating the position and character is sent to R via the changeover switch 38.
Written to AM45.

7) The video signal is reproduced by the magnetic head 5, and sent to the sync separator 48 via the changeover switch 58, preamplifier 46, and demodulator 47, where a synchronization signal synchronized with the reproduction signal is generated.

() Switch the contact of the changeover switch 38 to the side shown in the figure 5.

J) This allows the clock generator 49 to be output from the RAM 45.
A code signal for determining the position and character is read out in synchronization with the signal from the video processor 50, and is sent to the mixer 52 via the character generator 50 and the video processor 51.

In the 00 mixer 52, the reproduced video signal and the character signal are mixed and sent to the handset 8 and the video monitor television 53.

On the video monitor television 53, the name of the point to be searched is written on the target map, and an image showing the point (position) in a conspicuous manner is projected as shown in FIG. 4e. In addition, when the name and/or location is displayed in color, it may appear in a different color from the map color, such as red, blue, or green, or when it is in monochrome, it may blink. It is also possible to specify this by using 01, etc., or by enclosing it. In the embodiment described above, the video signal is frequency modulated and directly recorded as an analog value.

However, the present invention is not limited to this, and the video signal can be pulse code modulated (PCM = PulseCOdeMOdu)
latliOn) and record.

In this case, the modulator 56 is for modulating the pulse code signal, and the demodulator 47 is for demodulating the pulse code signal into a video signal. Since the present invention employs the method described above, if there is one master unit that records video signals and data signals, the desired information can be retrieved by connecting a number of playback-only slave units.

In other words, since the signal from the base unit itself is a combination of a data character signal and a video signal,
This can be done by configuring the slave unit to send the signal to be searched to the base unit, and in response to this, the signal sent from the base unit to the slave unit is temporarily recorded and played back. , the entire system becomes extremely inexpensive. Further, the parent device may have the function of recording and reproducing information, or may be a device exclusively for reproduction using a magnetic disk on which information is recorded in advance.

[Brief explanation of drawings]

FIG. 1 is a front view of a magnetic disk used in the method of the present invention, and FIG. 2 is an explanatory diagram of signals in the magnetic disk, where a is an explanatory diagram of a data signal, b is an enlarged view thereof, and c 3 is an explanatory diagram of a video signal, d is an enlarged view thereof, FIG. 3 is a block diagram of an apparatus for carrying out the method of the present invention, FIG. FIG. 5 is a block diagram of a specific embodiment of the base unit, FIG. 6 is a block diagram of the decoder in FIG. 5, FIG. 7 is a block diagram of another embodiment of the base unit. DESCRIPTION OF SYMBOLS 1... Magnetic disk, 2... Fixed track for data signals, 3, 5... Magnetic head, 6... Moving device, 7
...Main unit, 8...Slave unit, 9...Signal output terminal, 1
0...Data signal input terminal, 11...Zedeo signal input terminal, 12...Modulator, 13...Recording amplifier, 14
...Selector switch, 15, 16, 21...Contact, 1
7... Magnetic head, 18... Servo controller, 19.
...Motor drive amplifier, 20...Motor, 22...
Preamplifier, 23... Demodulator, 24... Video monitor television, 25... Keyboard, 26... Code generator, 27... Data output terminal cover, 28... Magnetic disk.

Claims (1)

[Claims] 1. A search signal for the target information is coded by the keyboard operation of the slave unit and sent to the base unit, and the base unit converts the search signal into the target video signal according to the command from the slave unit. Outputs a signal that is a mixture of data signals, and sends this signal to the fixed track of the magnetic disk of the slave device, one track for one screen.
A magnetic disk recording and reproducing method that records data temporally and demodulates it after recording to obtain a reproduced image. 2. The magnetic disk recording and reproducing method according to claim 1, wherein the master device records and reproduces a large amount of information on a plurality of tracks. 3. A magnetic disk recording and reproducing method according to claim 1, wherein the master device uses a pre-recorded magnetic disk for reproduction only.