JPS60242519A - Magnetic disk - Google Patents

Abstract

PURPOSE:To easily judge whether recording signals corresponding to tracks are an image or information by providing a track dedicated to recording for identifying whether the recording signals corresponding to the tracks are an image or information. CONSTITUTION:A video signal is recorded on the 1st track on a magnetic disk and an information signal is recorded on the 2nd track, and then a video/information identification signal for them is stored in the memory of a control means 6. A recording head moving mechanism 11 is driven with the control signal of the means 6 and a recording head 12 is moved to the 52th track for identification recording to perform recording operation. A reproducing head, on the other hand, is moved to the 52th track during reproduction on the basis of the control signal of the means 6, thereby judging that the image is recorded on the 1st track and the information is recorded on the 2nd track. For example, when the reproduction of the 1st track is indicated, it is decided that the contents are a video signal, and the signal is processed as specified and outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a magnetic disk suitable for use in a magnetic disk device capable of recording and reproducing video signals and information signals.

BACKGROUND ART Generally, an electronic still camera is a device that records and reproduces video signals using a magnetic disk, and in this case, a magnetic disk for an electronic still camera is used as a recording medium. Further, there is a floppy disk device as a device for recording and reproducing information signals, and a floppy disk is used as a recording medium.

However, although magnetic disk devices and magnetic disks that record and reproduce video signals and information signals on the same medium are not currently available, the demand for such devices is increasing.

If such a magnetic disk device is available, it can be used in various ways and its functions can be expanded. For example, you can record still images and related information such as titles and explanatory texts and use them as electronic picture-story shows or catalogs.
Furthermore, by connecting to a personal computer, still images and a game program can be recorded and used as an adventure game, or still images and a program specifying the reproduction order can be recorded and automatically reproduced.

However, when recording video signals and information signals on the same medium as described above, it is common to record video signals and information signals on a track-by-track basis, but video signals and information signals can be When recording on tracks, it is necessary to manage on which track the video signal is recorded and on which track information is recorded.

Therefore, an object of the present invention is to provide an identification signal necessary for identifying video signals or information signals that can be arbitrarily recorded on a track-by-track basis, separately from the above-mentioned two types of signal recording tracks. The purpose is to enable recording on the trunk and to manage which tracks video signals are recorded and which tracks information signals are recorded.

<Examples> The present invention will be described below according to examples shown in the drawings. 1st
The figure shows an embodiment of a magnetic disk according to the present invention, in which a first track TR on the outer circumference side is formed on one surface of the magnetic disk.
The 52nd track T R524 on the inner circumferential side from I has 52 tracks arranged concentrically, for example, at the track pitch P.
The track width W is 60 μm, and the guard band G is 40 μm. And here, from the 1st trunk TRI to the 50th trunk TR5
Video signals or information signals are arbitrarily recorded on the 50 tracks up to Q, and the signals recorded on each trunk from No. 1 to No. 50 are recorded on the innermost 52nd track TR52. A video/information identification signal that identifies whether it is a signal or an information signal shall be recorded.The 51st track TR5IK shall not record any signal, and the 50th track TR5Q and the No. 52 truck TR52
Used as a guard band for both trucks.

In the above embodiment, the 52nd track TR52 on the innermost track
is used as a track for recording identification signals, but this is because the recording density of magnetic disks generally decreases toward the inner track, and identification signals that do not require that much recording density are recorded here. Of course, instead of this, an identification signal recording track may be provided further on the outer periphery of the first track TRI.

FIG. 2 shows a block diagram of a recording system, in particular, of a magnetic disk device suitable for recording and reproducing video signals and information signals using the above-mentioned magnetic disk.

Note that since the identification signal can be considered as a type of information signal, the recording format of the identification signal and the recording format of the information signal are considered to be the same here. This allows the identification signal and the information signal to be handled in the same system in the magnetic disk drive.

The following describes the operation in the case where a video signal is recorded on the first track TRI on the magnetic disk and an information signal is recorded on the second track TR2. In this case, the user first performs a predetermined input operation according to the desired content using the input means 5 such as a keyboard.
A control means 6 consisting of a microcomputer having a PU, a main memory, and an input/output port judges the input signal and executes it according to a predetermined program. At this time, the control means 6 sends a control signal to the recording head moving mechanism I+ in order to move the recording head I2 to the first trunk according to the input signal, and at the same time turns the switch 4 to the terminal ■ side. On the other hand, the video input signal input to the video input terminal 1 at this time is subjected to appropriate signal processing such as FM modulation in the FM processing circuit 2, and then supplied to the recording head 12 via the recording amplifier 3 and switch 4. A video signal is recorded on the first track of the magnetic disk 13.

Thereafter, the recording head moving mechanism 11 is driven by the same operation based on the control signal from the control means 6, and the recording head 12 is driven.
is moved to the second trunk.

At the same time, the switch 4 is switched to the terminal ■ side. On the other hand, the information input from the input means 5 at this time is
The data is transferred from the microcomputer to the external memory 8, simultaneously receives address control from the address control circuit 7, is further converted into serial information by the parallel-to-serial converter 9, and is then recorded via the recording amplifier 10 and switch 4. The information signal is supplied to the head 12, thereby recording the information signal on the second track of the magnetic disk 13.

In this way, a video signal is recorded on the first track on the magnetic disk 13, and an information signal is recorded on the second track, but in this case, the video signal is recorded on the first track, and the video signal is recorded on the second track. The fact that each information signal is recorded, that is, the video/information identification signal is stored in the main memory built in the microcomputer of the control means 6. After the above recording operation of the video signal and information signal onto the magnetic disk is completed, the control means 6
The recording head moving mechanism 11 is driven by the control signal from the recording head 12, and the recording head 12 is moved to the 52nd track. The data is recorded on the 52nd track of the magnetic disk 13 by the same operation as above.

FIG. 3 also shows a block diagram of the magnetic disk device, particularly the reproduction system. When reproducing the magnetic disk I3, the reproducing head moving mechanism 14 is first driven based on a control signal from the microcomputer of the control means 6, and the reproducing head 15 is initially moved to the 52nd trunk, and at the same time the switch 16 is switched to the terminal ■ side. It will be done. At this time, the playback head I5
The identification signal regenerated is supplied to a comparator 22 via a switch 16 and a regenerative amplifier 21, where the waveform is shaped, and then supplied to a serial-to-parallel converter 23, where it is converted into parallel data and stored in an external memory 8. . Furthermore, at this time, an address control signal is applied from the microcomputer of the control means 6 to the address control circuit 6 to control the address of the memory 8 and read the contents of the identification signal into the main memory within the microcomputer. Thereafter, the microcomputer judges the contents of the main memory that have been read and can determine that the first track contains video and the second track contains information.

Once the identification signal is read into the main memory of the microcomputer of the control means, the input means 5
When you instruct the playback of a desired trunk on the magnetic disk, for example, track 1, it is immediately determined whether the content recorded on that designated track is a video signal or an information signal. Now, when this is identified as a video signal, the switch 16 is switched to the terminal ■ side, and at this time, the video signal reproduced from the magnetic disk 13 is transmitted to the switch 16, the reproduction amplifier 17, and the limiter 1.
The signal is supplied to the FM demodulation circuit 19 via 8, where it is FM demodulated and output to the video output terminal 20.

Effect> As described above, in a magnetic disk on which video signals and information signals can be arbitrarily recorded, video/information signals are used to identify whether the recording signal corresponding to each track is a video signal or an information signal. By providing a dedicated track for recording identification signals that records information identification signals separately from the video/information recording trunk, it is possible to determine whether the recording signal corresponding to each track is a video signal or an information signal. In this case, a track on which an information signal is recorded will not be reproduced as a video signal, or conversely, a track on which a video signal is recorded will not be reproduced as an information signal.

[Brief explanation of the drawing]

FIG. 1 is a recording pattern diagram of one embodiment of a magnetic disk according to the present invention, FIG. 2 is a block diagram of a recording system of a magnetic disk device for recording and reproducing the magnetic disk, and FIG. 3 is a block diagram of the reproducing system. It is. 13...Magnetic disk, TR52...Video/information identification signal recording track. Agent: Patent attorney Aihiko Fuku (2 others) Figure 2, Figure 3

Claims (1)

[Claims] 1. In a magnetic disk on which both video signals and information signals can be arbitrarily recorded, whether the recorded signal corresponding to each track separately from the video/information recording track is a video signal or an information signal. 1. A magnetic disk characterized by being provided with an identification signal recording track for recording a video/information identification signal for identification.