JPS6058523B2 - Magnetic disk playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for converting video signals into analog or PCM (PCM) format in advance.
A magnetic disk that combines a video signal and a data signal during playback by using a plurality of tracks on which data is directly recorded (ulseCodeModulation) and a fixed track on which data is prerecorded as a digital value. It is related to "playback device".

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, there has been a desire for a device that can easily search for different points by combining different data (converted to characters) even on the same map. The present invention was made in response to such demands, and uses a magnetic disk, which includes a plurality of randomly accessible tracks on which video signals are recorded, and fixed tracks on which data signals are recorded. This device has a track and is designed to appropriately combine and project a video signal and a data signal during playback.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a magnetic disk 1, and the outermost circumference of the magnetic disk 1 is provided with one or more fixed data tracks 2 for recording and reproducing data signals as described later.

The fact that the data tracks 2 are fixed means that the recording/reproducing magnetic heads 3 shown in FIG. 3 are also fixedly provided in the number of tracks 2. All the inside of this data track 2 are video tracks 41 to 4n, and the video signals are analog or PCM (PCM).
A randomly accessible multiple (for example n
It consists of 256 channels) tracks. The magnetic head 5 for recording and reproducing the video tracks 41 to 4n
As shown in FIG. 3, the position is selectively controlled by a moving device 6. FIG. 2a is an enlarged view of the data signal in the data track 2 when indicating, for example, the position of one place on one map, and each data signal consists of, for example, 190 bits.
It is classified from R256OJ to R256OJ.

Figure 2b shows a further enlargement of this 1 data signal.From the top, 5 bits for start, 160 bits for name (1
20 characters (8 bits), channel (or page.
j) It consists of 8 bits for number, 10 bits for position, 2 bits for check, and 5 bits for blank, totaling 190 bits. Therefore, one data track is 190 (bits) x 256 (channels) x 10 (
location) = 486.4 kilobits. Ru. Figure 2 C is
The video signals in the video tracks 41 to 4n are shown, and one field or one frame is stored in one track.

Figure 2d shows a further enlarged 1H (horizontal scan).
In the signal waveform of the period, VS indicates a video signal and HD indicates a horizontal synchronization signal. FIG. 3 is a block diagram of the playback device. In this figure, 1 is the magnetic disk, and one of the video tracks 41 to 4n of the magnetic disk 1 has the following:
Assume that a road guide map (original image) as shown in FIG. 5a, for example, is recorded as information for recording and reproduction.

Further, it is assumed that data signals for displaying names and positions in a certain map are recorded in the data track 2, as shown in FIG. 5b.

The motor controller 7 is connected via a motor drive amplifier 8 to a motor 9 for rotating the magnetic disk 1.

A video signal reproducing magnetic head 5 attached to the moving device 6 is connected to a frequency modulated signal demodulator 11 via a preamplifier 10. Next, 12 is a keyboard, and this keyboard 12 is connected to a decoder 14 via a code generator 13, and its output side is connected to the motor 16 of the moving device 6 via a drive amplifier 15. .

The data head 3 is connected to a decoder 14 via a read amplifier 17. The demodulator 11 is connected to the sync separator 19 in the character display signal generator 18 and also to the mixer 20, and also connects the output side of the horizontal sync signal D of the sync separator 19 to the output side of the vertical sync signal VD. The output side is connected to a clock generator 21. This clock generator 21 is connected to one contact 25 of a character generator 22, a video processor 23, and a recording/playback changeover switch 24. The other contact 26 of this switch 24 is connected to the decoder 14, and the common contact 27 is connected to a fixed storage device (hereinafter referred to as RAM).
28 to the character generator 22. Further, the video processor 23 includes the mixer 2
0 to a video monitor television 29.
Next, FIG. 4 shows details of the decoder 14.

In this figure, a signal input terminal 30 from a code generator 13 is connected to a name code matching circuit 31 and a mode controller 3.
2, and the signal input terminal 3 from the read amplifier 17
3 is a code separator 34 that separates the signal into three code signals: name code, position code, and channel code.
The output side of the name code signal is connected to the matching circuit 3.
1, and the output side of the position code signal and channel code signal is connected to a character adder 37 and a channel selection controller 38 via changeover switches 35 and 36.
It is connected to the. The signal input terminal 30 from the code generator 13 is also connected to a position data adder 39 which, together with the character adder 37, is connected to an adder 40 to convert the position and character into codes. It is connected to a signal output terminal 41, and this signal is sent to the contact 26 side of the changeover switch 24. Further, a signal output terminal 42 of the mode controller 32 is connected for switching control of the changeover switch 41, and a signal output terminal 43 of the channel selection controller 38 is connected to the drive amplifier 15. Next, the order of playback will be explained.

(1) The data track 2 is scanned by the data magnetic head 3, and the name code is constantly reproduced, and the output signal is read out and sent to the decoder 14 via the read amplifier 17.

(2) When the name to be searched is keyed in on the keyboard 12, a coded signal is sent from the code generator 13 to the decoder 14.

(3) In the decoder 14, the reproduced data output from the read amplifier 17 is separated into name code, position code, and channel (page number) code signals by the code separator 34, and further by the coincidence circuit 31, the name code signal and the A matching relationship with the keyed-in name code signal is determined.

(4) When the contents of the name codes match, the matching circuit 31 outputs an output to turn the switches 35 and 36 ON, and the mode controller 32 sends a control signal to the changeover switch 24.

Note that if there is no match, the search continues on the data track until a match is found. (5) Switch 36
With ON operation, the channel code signal is sent to the drive amplifier 15 via the channel selection controller 38 to drive the motor 16. At the same time, with the 0N operation of switch 35,
A character adder 37 adds the shape to be displayed (for example, a mouth, an O, etc.) to the position code signal that determines the position of the display object, and a position data adder 39 adds the name code to the name code. Position data of the display position of the name is added and added to the adder 40. (6) The code signal for changing the position and character is sent to R via the changeover switch 24.
Written to AM28.

(7) The video signal is reproduced by the magnetic head 5 and sent to the sync separator 19 via the preamplifier 10 and demodulator 11;
A synchronization signal synchronized with the reproduction signal is generated.

(8) Switch the changeover switch 24 to the contact 25 side.

(9) As a result, the code signal for determining the position and character is read out from the RAM 28 in synchronization with the signal from the clock generator 21, and the character generator 2
2. The signal is sent to the mixer 20 via the video processor 23. The grab mixer 20 mixes the reproduced video signal (original image) and the character signal (guidance image), and the video monitor television 29 has the name written on the target map and the target position easily visible. It will appear in your state.

Note that when the name and/or position (point) is displayed in color, it may be displayed in a different color from the map color, such as red, blue, or green, or when it is displayed in monochrome. , may be made to blink, may be indicated by 01, etc., or may be surrounded. In the embodiment described above, a frequency modulation signal directly recorded as an analog value was used as the video signal.

However, it is not limited to this, and the video signal may be pulse code modulated (PCM=PulseCOdeM).
It is also possible to use a file recorded with OdurationOn). In this case, the demodulator 11 is for demodulating the pulse code signal into a video signal. Since the present invention is configured as described above, it is possible to easily search for desired information.

That is, when data to be searched is input by operating the keyboard, the data is combined with a video signal to form a single image. Therefore, it is particularly suitable for road guidance, building and machinery maintenance guidance, etc. in which a single picture has a large number of search points. Furthermore, as long as there is a magnetic disk prerecorded in analog or PCM format, an extremely large amount of information can be retrieved with simple operations. Furthermore, the code input from the keyboard is converted into a character signal and added to the video signal to reproduce the image. Therefore, the search is accurate, and even if there is an error in the input code, it can be easily confirmed.

[Brief explanation of the drawing]

FIG. 1 is a front view of a magnetic disk used in the device according to the present invention, and FIG. 2 is an explanatory diagram of signals in the magnetic disk.
a is an explanatory diagram of a data signal, b is an enlarged diagram thereof, c is an explanatory diagram of a video signal, d is an enlarged diagram thereof, FIG. 3 is a block diagram showing an embodiment of the apparatus according to the present invention, and FIG. 3 is a detailed block diagram of the decoder portion, FIG. 5a is an original image diagram of only a video signal, and FIG. 5b is a guide image diagram of only a data signal. DESCRIPTION OF SYMBOLS 1... Magnetic disk, 2... Fixed track for data signals, 3, 5... Magnetic head, 4... Track for video signals, 6... Moving device, 7... Motor controller,
8...Motor drive amplifier, 9...Motor, 10...
- Preamplifier, 11... Demodulator, 12... Keyboard, 13... Code generator, 14... Decoder, 1
5... Drive amplifier, 16... Motor, 17... Read amplifier, 18... Character display signal generator, 1
9... Synchronization separator, 20... Mixer, 21... Clock generator, 22... Character generator, 23...
Video processor, 24... changeover switch, 25, 2
6, 27... Contact, 28... RAM l29... Video monitor television, 30, 33, 43... Signal input terminal, 31... Matching circuit, 32... Mode controller, 3
4... Code separator, 35, 36... Changeover switch, 37... Character adder, 38... Channel selection controller, 39... Position data adder, 40
...Adder, 41, 42...Signal output terminal.

Claims (1)

[Claims] 1. Direct analog or PCM video signal for one screen
Multiple video signal tracks that can be randomly accessed are recorded on one track as a signal, and data signals for multiple video tracks are collectively recorded on one track as a digital signal, and the data includes at least a name code and a channel code. a magnetic disk having one or more fixed tracks containing codes and position codes; means for demodulating video signals on the magnetic disk; means for reproducing coded data signals on the magnetic disk; and objective information. A means for operating a keyboard to obtain an input code signal when attempting to search, a means for determining a match between the reproduced data signal and the input code signal, and a means for searching for a desired video track based on the match output. The apparatus includes a device for moving a magnetic head, a means for generating a character signal from the reproduced data signal, a means for synthesizing the character signal with a demodulated video signal, and a means for reproducing the synthesized signal into an image. A magnetic disk playback device characterized by: 2 The means for determining whether the reproduced data signal and the input code signal match
It has a code separator that separates each signal into a channel code and a position code, and the name code signal has a
A position data signal of the entry point is added to the position code signal, a character signal in the shape of the indicated point is added to the position code signal, and the signals are sent to a character signal generating means. A magnetic disk reproducing apparatus according to claim 1, wherein the magnetic disk is sent to a moving device for head movement. 3. The means for determining whether the reproduced data signal and the input code signal match each other has a matching circuit that detects matching of the respective name code signals, and the output of this matching circuit controls the mode controller of the character generation mode. 3. The magnetic disk reproducing apparatus according to claim 2, further comprising controlling a changeover switch between the position code signal and the channel code signal, which are code-separated.