JPH04365282A - Digital video signal recording method - Google Patents

Abstract

PURPOSE:To obtain the digital video signal recording method which has sufficiently high correction ability to large drop-out and further enables the high- speed recording of digital video signals. CONSTITUTION:Two similar magnetic disk devices 1A and 1B are prepared while respectively providing five magnetic disks 2A-1-2A-5 and 2B-1-2B-5, the odd-number field video signals of the NTSC system digital video signals are parallelly recorded to the disk device 1A side recording object disk faces 2A-1A 2A-5A and 2A-1B-2A-4B, and the even-number field video signals are parallelly recorded onto the disk device 1B side NTSC system recording object disk faces 2B-1A-2B-5A and 2B-1B 2B-4B.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital video signal recording method for recording video signals such as still images and moving images converted into digital signals onto an information recording disk of an information recording disk device.

0002

2. Description of the Related Art In recent years, information recording disk devices such as magnetic disk devices and optical disk devices have been widely used. This information recording disk device records video signals such as still images and moving images converted into digital signals using the NTSC system, in which one frame of video signal is composed of an odd field video signal and an even field video signal. As a recording method to do this, for example, the digital signal recording method disclosed in Japanese Unexamined Patent Publication No. 64-48576 is known. FIG. 2 is a plan view of a disk for explaining a first conventional digital video signal recording method, and FIG. 3 is a disk plan view for explaining a second conventional digital video signal recording method.

As shown in FIG. 2, in the first conventional digital video signal recording method, NTSC is
The odd field video signal of the C format one frame digital video signal is placed in, for example, area 15 at the inner circumference using a plurality of tracks, and the even field video signal is placed in the area following area 15 using the same number of tracks. 16, respectively. In the first conventional digital video signal recording method described above, if a large dropout occurs across the recording areas 15 and 16 on the disk surface 12A, error correction may become impossible. An improved second conventional recording method as described below has been proposed.

As shown in FIG. 3, in the second conventional digital video signal recording method, the right half of the disk surface 22A in FIG. Odd field area 2
3. The left half is set as the even field area 24, and the odd field video signal of the NTSC one-frame digital video signal is transferred to, for example, the inner circumferential area 25 in the odd field area 23 using the right half of the plurality of tracks. , an even field video signal is recorded in an area 25 and a pair of areas 26 within the even field area 24 using the left half of the plurality of tracks.

[0005]

[Problems to be Solved by the Invention] In the first conventional digital video signal recording method, as described above, when a large dropout occurs, error correction becomes impossible and correction becomes difficult. There was a problem that there was. Further, in both the first and second conventional digital video signal recording methods, a plurality of tracks are used to record one frame of digital video signal, so there is a problem that it takes time to record and reproduce. Therefore, this method is not suitable for recording and reproducing moving images. Moreover, the second conventional example digital video signal recording method has the following advantages compared to the first conventional example.
Although the ability to correct large dropouts is greatly improved, since the odd field area 23 and the even field area 24 are arranged adjacent to each other on the same disk surface 22A, it is not necessarily sufficient. I can't say that.

The present invention has been made in view of the above points, and provides a digital video signal recording method that has a sufficiently high ability to correct large dropouts and is capable of high-speed recording of digital video signals. The purpose is to

[0007]

[Means for Solving the Problems] The digital video signal recording method of the present invention is for recording a digital video signal in which one frame of video signal is composed of an odd field video signal and an even field video signal into an information recording disk device. In a digital video signal recording method for recording on a recording disk, a plurality of disk surfaces are prepared for the information recording disk, the disk surfaces to be recorded among the plurality of disk surfaces are divided into two groups, and the disk surface of one group is The above object is achieved by recording the odd field video signal and the even field video signal on the disk surface of the other group, respectively.

[0008]

Embodiment An embodiment of the digital video signal recording method of the present invention applied to a magnetic disk system will be described below. FIG. 1 is a block diagram for explaining an example of a case where the digital video signal recording method of the present invention is applied to a magnetic disk system.

As shown in the figure, a magnetic disk system 1 to which a digital video signal recording method according to an embodiment of the present invention is applied includes two similar magnetic disk devices 1A, 1B,
It is composed of a common motor control circuit 5, a host device 10, and the like. This magnetic disk device 1A has a spindle 3A.
Five magnetic disks 2A- are coaxially fixed at equal intervals to
1 to 2A-5 (generally referred to as 2A, the top surface of each is 2A-
1A to 2A-5A, and the bottom surface is 2A-1B to 2A-5B), this spindle 3A, and thus a spindle motor 4A that rotationally drives the magnetic disk 2A, corresponds to the top surface 2A-1A to 2A-5A of each disk. The arranged magnetic heads 6A-1A to 6A-5A and the lower surfaces 2A-1B to 2A-
Magnetic heads 6A-1B to 6A arranged corresponding to 5B
-5B (6A is the collective name for a total of 10 magnetic heads)
, each magnetic head 6A-1A to 6A-5A and 6A-1B
~6A-4B, recording and reproducing circuits 7A-1A to 7A that control the recording and reproducing operations of each magnetic head.
-5A and 7A-1B to 7A-4B (a total of nine recording/reproducing circuits are collectively referred to as 7A), which are connected to magnetic heads 6A-5B, and tracking recorded in advance on the bottom disk surface 2A-5B. Based on the tracking servo signal obtained when the heads 6A-5B reproduce the servo track, each magnetic head 6A is moved to the disk 2A by driving an actuator (not shown).
Tracking servo circuit 8A for positioning in the radial direction of
, this recording/reproducing circuit 7A and the tracking servo circuit 8
The magnetic disk device 1B is configured in the same manner as the disk device 1A, so the explanation thereof will be omitted. The code for each component of the device 1B is 1 compared to the case of the disk device 1A.
The suffix A is replaced with B, just as A was changed to 1B).

[0010] The spindle motors 4A and 4B are controlled by a motor control circuit 5 to operate at a CAV system speed of 3,600 rpm.
are operated synchronously. Further, this motor control circuit 5 and the control devices 9A and 9B are each connected to and controlled by the host device 10. Then, under the control of the host device 10, the odd field video signal of the NTSC one-frame digital video signal is transferred to the magnetic disk device 1.
On the A side, even field video signals are recorded and reproduced in parallel on the magnetic disk device 1B side.

That is, taking the disk device 1A side in recording mode as an example, this odd field video signal is divided into eight logical units, and one logical unit for error detection is added for a total of nine logical units. The parallel data consisting of the above-mentioned nine recording/reproducing circuit groups 7A, the magnetic head group 6A corresponding to the recording/reproducing circuit group 7A, and the nine recording/reproducing channels consisting of each disk surface of the disk 2A, This disk 2A is 1
During rotation, one logical unit per track on each disk surface is recorded in parallel. Since the data transfer rate per channel is approximately 20 Mbps, the total of 8 channels for the 8 logical units of the odd field video signal is 160 Mbps, and parallel recording is similarly performed on the disk device 1B side for the even field video signal. This results in a total speed of 160 Mbps, and by alternately repeating the recording of odd field video signals and even field video signals in the disk devices 1A and 1B, it becomes possible to record moving images in the NTSC system.

[0012] The digital video signal recording method according to the embodiment of the present invention as described above provides NTSC for the two magnetic disk drives 1A and 1B of the magnetic disk system 1.
Since the odd field video signal and even field video signal of the C format one frame digital video signal are recorded in parallel, high-speed recording is possible, and as mentioned above, recording and playback of NTSC format moving images is possible. At the same time, it has a sufficiently high correction ability for the above-mentioned large dropout.

[0013]

[Effects of the Invention] The digital video signal recording method of the present invention as described above has a sufficiently high correction ability for large dropouts, and also enables high-speed recording of digital video signals, resulting in relatively low transfer rate. Even if an information recording disk device with a low-reliability disk is used at a high rate, it is possible to record and reproduce NTSC moving images, and the cost performance of this system is improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram for explaining an example of application to a magnetic disk system, which is an embodiment of the digital video signal recording method of the present invention.

FIG. 2 is a plan view of a disk for explaining a first conventional digital video signal recording method.

FIG. 3 is a plan view of a disk for explaining a second conventional digital video signal recording method.

[Explanation of symbols]

1 Magnetic disk system 1A, 1B Magnetic disk device (information recording disk device) 2A, 2B Magnetic disk (information recording disk)
2A-1A to 2A-5A, 2A-1B to 2A-5B, 2
B-1A~2B-5A, 2B-1B~2B-5B
Multiple disk surfaces 2A-1A to 2A-5A, 2A-1B to 2A-4B, 2
B-1A~2B-5A, 2B-1B~2B-4B
Recording target disc surface 2A-1A to 2A-5A, 2A-1B to 2A-4B
Disk surfaces 2B-1A to 2B-5A, 2B-1B to 2B-4B of one group
Disk surface of the other group

Claims (1)

[Claims] 1. A digital video signal recording method for recording a digital video signal in which one frame of the video signal is composed of an odd field video signal and an even field video signal on an information recording disk of an information recording disk device, wherein the information A plurality of disk surfaces are prepared for the recording disk, the disk surfaces to be recorded among the plurality of disk surfaces are divided into two groups, and the odd field video signal is applied to the disk surface of one group and the disk surface of the other group. A digital video signal recording method, comprising recording each of the even field video signals.