JPS63275072A - Disk recording and reproducing device - Google Patents

Abstract

PURPOSE:To record and reproduce code information and image information by one type of disk by counting the number of sectors by the use of a prescribed idle area, a first mark signal written in an idle track, and a second mark signals indicating the start of data and a sector. CONSTITUTION:The plural blocks constitute the sector as one unit and a sector mark generating circuit 15 for generating a sector mark signal disposed at the leading part thereof is provided. The first mark signal previously written in the prescribed idle track or the idle area on the disk is defined to be a start point and the data is recorded and reproduced on the disk and at the time of a reproduction, the first mark signal and the second mark signal indicating the start of the data and the sector are used to correctly count the number of the sectors and write the data in a buffer memory. Thereby, an access can be attained to an ordinary sector.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an apparatus for recording and reproducing image data and code data on a disc-based recording medium such as an optical disc.

[Prior art] Devices using magnetic recording media such as magnetic tapes and magnetic disks are widely used as auxiliary storage devices in computers, but in recent years, the recording density of these magnetic recording media can be greatly increased. Auxiliary recording devices using optical recording media (eg, optical disks) are attracting attention.

Further, in the field of information services, etc., file devices for still images or moving images, which allow software production to be performed relatively easily, are attracting attention.

The above two information recording/reproducing devices use discs of different formats depending on the nature of the information handled. For example, when handling code information like the former,
Since it is advantageous to have a configuration in which random access can be performed using a certain amount of data as a unit, the track of the optical disk is divided into many sectors of equal capacity as shown in Fig. 6, and an address is given to each sector. A method is adopted in which recording and reading are performed as an access unit (for example, "Nikkei Electronics J No. 1983.11.21, pp. 189-213). In this method, in order to ensure recording or reading to a specified sector, Therefore, it is essential to accurately detect the start position of each sector.Therefore, a sector start mark consisting of a certain special pattern is recorded in advance at the beginning of each sector, and when this is detected, the sector start signal is activated. The sector start mark is often not detected due to dirt on the disk surface, tracking misalignment, deterioration of recording quality, etc. For example, JP-A No. 6
Publication No. 0-253060 □ proposes a method in which a sector mark is written on an empty track or area on an optical disk at the same position as the sector start mark, and the sector mark is detected by a sensor different from the recording/reproducing means.

On the other hand, in the case of still image or video image information, it is necessary to access it in field or frame units, so it is different from code information]. As shown in Figure 7, sector marks or addresses are recorded in the preformat area. Each track consists of one or two sectors.

Problems to be Solved by the Invention However, in the above-described disk device, two different format disks are required for code information and image information. Furthermore, when recording information divided into fine sectors onto an optical disk used for image information, it is necessary to preformat symbols such as sector start marks before data, making the recording work complicated.

In this way, two different pieces of information require two different format disks, which poses a problem in that manufacturing and management of the disks becomes complicated.

In view of this point, the present invention makes it possible to record and reproduce code information and image information on one type of disc, and
Another object of the present invention is to provide a disk recording and reproducing device that can also perform random access in sector units.

Means for Solving the Problems The present invention provides means for reading data from a buffer memory starting from a first mark signal written in advance in a predetermined empty track or area on a disk; and means for recording and reproducing a second mark indicating the start of a sector, and counting the number of days, evenings, and sectors based on the first mark and second mark signals,
A disk recording/playback device equipped with means for writing data into a buffer memory.

According to the above-described structure, data is recorded and reproduced on a disk using the first mark signal as a starting point, and the number of sectors is calculated using the first mark signal and the second mark signal during reproduction. It is possible to accurately count and write data to buffer 1 memory.

Therefore, it is possible to access any sector.

Embodiment FIG. 1 is a block diagram of an address counter which is a main component of a disc recording/reproducing apparatus according to an embodiment of the present invention. FIG. 2 shows a block diagram of the recording system of the disc recording/reproducing apparatus of the same embodiment. FIG. 4 also shows a block diagram of the reproduction system.

In Figure 2, 1o is a buffer memory for temporarily storing data, 11 is an address counter for loading and reading data into the buffer memory, and 12 is an empty track or area of the disk. A V mark detector is a recorded first mark signal; 13 is an encoder that generates and adds a code for error detection and correction to data read from the buffer memory 10; A synchronization signal generation circuit 15 constitutes a block as a unit and adds a synchronization signal to the beginning of the synchronization signal generation circuit, and 15 constitutes a sector with a plurality of blocks as one unit, and a sector mark signal that is a second mark signal that comes at the beginning A sector mark generation circuit 16 is a mixer that further mixes a sector mark signal with a data string to which a synchronization signal has been added, and a modulator 17 is a modulator that performs digital modulation for recording a signal on a disk.

The operation of the recording system of the Honjitaki example configured as described above will be explained using FIG. 3.

When a V mark signal, which is the first mark signal recorded in an empty track or an empty area on the disk, is received by a sensor or the like and inputted to the V mark detection circuit 12, a mark signal shown in waveform 20 in FIG. 3 is obtained. It will be done. However, it is assumed that the disk is pre-recorded with two mark signals per revolution.

On the other hand, code data or image data is input to the buffer memory 10 and once written into the memory. At this time, the write address is generated by the address counter 11. Here, the capacity of the buffer memory is assumed to be the amount of data recorded on one track.

Next, when writing the data to the disk, use the V mark 20 from the mark detector 12 as a reference.
The read address counter of the address counter 11 is reset. As a result, data is read from the buffer 1 memory 1o starting from the ■ mark. The data read from the buffer memory 10 is added with an error correction code generated by the encoder 13 and input to the synchronization signal generator 14 . The synchronization signal generator 14 collects a plurality of pieces of data, blocks them, and adds a synchronization signal to the beginning of the blocks. On the other hand, the sector mark generator 15 generates a sector mark signal, which is a second mark signal to be added to the beginning of a plurality of blocks that are collected to form a sector. Then, the block train and sector mark signal from the synchronization signal generator 14 are mixed by a mixer 16, and the modulator 1
7 and recorded on the disc. FIG. 3 21 shows an example of a sector configuration having 12 sectors in one rotation, and 22 shows an example in which the sector is composed of 128 blocks.

23 shows a sector mark signal. As described above, during recording, data is collected for each track to form sectors, and sector mark signals are simultaneously recorded in each sector.

Next, FIG. 4 is a block diagram of the playback system of the disk recording and playback apparatus of this embodiment, where 30 is a demodulator, 31 is a TBC (time pace corrector) that absorbs jitter, and 32 is a sector that detects sector mark signals. Mark detector, 33 is a V mark detector, 34 is a buffer 1 for storing data.
Memory, 36 is an address counter for writing and reading data into the buffer 1 memory, and 36 is a decoder that corrects errors caused by scratches or defects on the disk using an error correction code added during recording. .

The operation of the reproduction system of this embodiment configured as described above will be explained.

Data reproduced from the disk by the head is demodulated by the demodulator 30 and input to the TBC 31 and sector mark detection 32 . The TBC 31 absorbs jitter that occurs during disc playback, and the playback data is written into the buffer memory 34. It also detects a sector mark signal from the reproduced data and inputs it to the address counter 36.

On the other hand, as in the case of recording, a V mark signal recorded in an empty track or an empty area is detected by the V mark detector 33 and inputted to the address counter 36.

Here, the write address generation operation of the address counter 35 is performed. For this purpose, FIG. 1 shows a specific example of a write address generation section. Also, to explain its operation,
FIG. 5 shows a waveform diagram. In FIG. 1, 60 is an OR (logical sum) circuit, 61 is an OR circuit, 52 is a block counter, 63 is a sector address counter, and 54 is a block counter that decodes the 620 count output to generate a pseudo sector mark signal. Decoder, 55 is sector counter 63
56 is an AND circuit that gates the pseudo sector mark signal from the decoder 53, 57 is an AND circuit that also gates the v mark signal, and 68 is the output of the AND circuit 66. A delay circuit 59 delays the output of the AND circuit 67 by a time t2.

The operation of the address counter of FIG. 1 configured as above will be explained.

The V mark signal shown at 40 in FIG. 5 is sent to the AND circuit 57,
Also, a sector mark signal shown at 41 is input to the OR circuit 60. During the period in which the output of the OR circuit 61 is "L", the sector mark signal is sent to the block counter 5 via the OR circuit 6°.
2, and the block counter is reset. Then, counting continues until the next sector mark signal is input from the OR circuit 60. The output of the block counter 62 is input to the decoder 54, and a pseudo sector mark signal is generated. When the block counter 52 counts a predetermined block, it inputs a carry to the sector counter 63, and the sector counter 63 counts up for each carry. The output of the sector counter 6a is input to the decode 65, and gate signals 42 and 43 shown in FIG.
t-output.

For example, as shown in the figure, the gate signal 42 is 6,12°.
...and every 6 sectors, the gate signal 43 is also 7,13 degrees...
・is output every 6 zectors. And gate signal 42
is input to the AND circuit 66, while the gate signal 43 is input to the AND circuit 67. Since the pseudo sector mark signal and the V mark signal from the decoder 64 are input to the AND circuits 66 and 57, respectively, signals of waveforms 44 and 45 are outputted by the above gate signal. Furthermore, the pseudo sector mark signal is delayed by t by the delay circuit 68 and ORed.
It is input to the circuit 61. Further, the ■ mark signal is delayed by a time t2 by the delay circuit 69, and is similarly input to the 0.R circuit 62. The output of the OR circuit 61 is input to one side of the OR circuit 61 as shown in the waveform 46. The other input of the OR circuit 6o is the sector mark signal as described above. The decoded value of the decode 54, the value of the delay amount t of the delay circuit 58, and the value of the delay amount t2 of the delay circuit 69 are set so that the timing coincides with the sector mark signal as described above.

By using this address counter 36, even if the sector mark signal is not detected due to scratches on the disk, etc., it is protected by the aforementioned pseudo sector mark signal and V mark signal, and the beginning of the sector can be reliably detected. . Therefore, there is no need to record sector mark signals in empty tracks or areas in advance, and even a disk with only one or two V mark signals per revolution as in this embodiment can be used as a conventional code data-only disk. Can be used in the same way.

Data buffer 1 is stored using the above address counter 36.
Data is written into the memory 34, and although the explanation of the operation will be omitted, data is read from the buffer memory 34. Finally, errors occurring in the data are corrected by the decoder 36, and the data is output to the next stage.

Effects of the Invention As explained above, conventionally, when recording code data, a disk divided into a large number of sectors, such as a disk dedicated to code files, was used, but according to the present invention, an image file This is now possible even for disks that have one or two sectors per track, such as those used in the 2000s, and as a result, instead of two types of disks, there is now only one type.

Furthermore, the peripheral circuitry for recording and reproducing information on the disk can also be shared, which has a great practical effect.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a write address generation unit of an address counter of a disc recording/reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram of a recording system of a disc recording/reproducing apparatus according to an embodiment of the present invention. FIG. 3 is a signal diagram for explaining the embodiment, FIG. 4 is a block diagram of the playback system of the disk recording and playback device according to the embodiment of the present invention, and FIG. 6 is the operation of the write address generation section of the address counter. FIG. 6 is an explanatory diagram showing the format of a disc for recording and reproducing conventional code data, and FIG. 7 is an explanatory diagram showing the format of a disc for recording and reproducing image information. . 6o...OR circuit, 62...OR circuit, 62...Block counter, 63...
・Sector counter, 64...7' Cor/,
55...Deco-7, se...AND circuit, 67...AND circuit, 58...Delay circuit, 69...Delay circuit . Name of agent: Patent attorney Toshio Nakao and one other person
Figure 7

Claims (1)

[Claims] means for detecting a first mark signal written in advance in a predetermined free track or free area on a disk; means for reading data from a buffer memory using the first mark signal as a starting point; the data; means for recording and reproducing a second mark signal indicating the start of a sector on the disk; and a means for counting the number of sectors using the first mark signal and the second mark signal, and storing the reproduced data in a buffer memory. What is claimed is: 1. A disc recording and reproducing apparatus comprising: means for writing to a disc.