JPS61148979A - Digital data recording method - Google Patents

Abstract

PURPOSE:To obtain a disc-like recording medium from which an independent reproduction of data obtained during 1-frame duration by adding the digital data with an error-correcting code in the unit of specified quantity, then applying interleaving. CONSTITUTION:A digital data D is transferred from a data generating part 1, and added with error-correcting code by an error-correcting code generating part 3. Each n-blocks unit DUE of the data D is supplied to an interleave processing part 4. The processing part 4, under the control by the interleave controlling signal Si from a controlling part 20, interleaves the respective unit of the block and error-correcting codes. The unit data Id of which content is the n-block unit DUE of the digital data D that is interleaved by the processing part 4, is encoded as a unit-data-ID code by an encoding part 5. The signal is converted to an analogue signal by a D/A converter 9, then formed as a video signal of 1 frame, and is recorded within one turn of the spiral recording track formed on the disc-like recording medium 36.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a digital data recording method for forming a spiral or annular recording trunk on which digital data is recorded on a disk-shaped recording medium.

BACKGROUND OF THE INVENTION For example, a video disc in which a video signal is recorded on a spiral recording track, each frame period of which corresponds to one revolution of the spiral recording track, so as to be optically readable is used. is known as a video signal recording medium from which relatively high-quality reproduced video signals can be easily obtained. To reproduce a video signal from such a video disc, the video disc is rotated at a predetermined speed, and an optical stylus formed by a light beam such as a laser beam is rotated to record the video disc in a spiral shape. A video disc player is used that reads a video signal recorded from a spiral recording track by following the track.

Such a video disc player is not only made to play back video signals recorded on a video disc sequentially in the order in which they were recorded, but also to be connected to a computer as an external control means and to be controlled by the computer. and various aspects of operations, for example, operations of sequentially reproducing video signals recorded at a plurality of specific positions on a video disc in a predetermined order and for a predetermined time;
It has been considered to perform operations such as replacing a specific video signal read from a video disc with a separately prepared graph ink display signal. In other words, the video disc player can be made multi-functional. In such cases, information containing procedures for causing a computer to control the operation of the video disc player is prerecorded on the video disc in the form of a video signal, and the information read from the video disc is recorded in advance. It is conceivable that such information may be reproduced and inputted to the computer to obtain desired operational control over the videodisc player by the computer. Since the input to a computer is usually digital data, the information recorded on a video disc for this purpose is converted from digital data into a video signal that is transmitted once per revolution of a spiral recording track. The frame periods are made to correspond and are recorded, thus resulting in the recording of digital data on the video disc.

Recording and reproducing digital data involves the problem of bit errors occurring, and therefore, when recording and reproducing digital data, it is necessary to correct the erroneous bit when a bit error occurs. Error correction is performed. In order to effectively perform such error correction, recorded digital data is generally divided into multiple blocks each consisting of a predetermined number of bits, and the data is divided between multiple blocks within each unit. Interleaving is performed in which the bits are rearranged based on a predetermined relationship, and then encoded. When decoding digital data encoded with such interleaving, it is necessary to handle each interleaved unit in order to perform dinterleaving to remove the interleaving. .

As mentioned above, when digital data is recorded on a video disc, the digital data to be recorded is converted into a video signal form and recorded at multiple stations on a spiral recording track on the video disc. It has been proposed that an interleaved and coded format be used in units of amounts spanning multiple frame periods when converted into a video signal. Therefore, digital data recorded on a conventional video disc in the form of a video signal is read out from the spiral recording track on the video disc, converted into encoded digital data, and converted into an encoded digital data. Video signals obtained in response to video signals read from multiple stations on a recording track, that is, video signals obtained from multiple frame periods, are dinterleaved and decoded as a unit and then reproduced. Become.

Problems to be Solved by the Invention A video disc player is usually capable of performing a random access reading function of searching for an arbitrary round of a spiral recording track on a video disc and reading a signal therefrom. However, as mentioned above, it is possible to connect a videodisc player into which a videodisc on which digital data is recorded to an external computer so that it can perform various operations under the control of the computer. If it is possible for a video disc player to play back digital data from a video disc independently for each revolution of a spiral recording track, then one revolution of a spiral recording track for digital data is a unit. Random access playback is now possible, and the necessary digital data can be quickly played back and input into a computer.
It's convenient.

However, in conventional video discs in which digital data is recorded after being converted into a video signal, the recorded digital data is recorded in a spiral pattern on the video disc due to the interleaving applied to it. It is not possible to independently reproduce each video signal corresponding to one rotation of the trunk, that is, each video signal obtained during one frame period.

As a result, the random access reading function of the video disc player is not fully utilized, making it difficult to input the digital data played from the video disc into a computer and perform various controls efficiently. be.

In view of the above, the present invention provides a method in which digital data is converted into a video signal, each frame period of which is recorded as corresponding to one revolution of a spiral recording trunk, and the recorded digital data is An object of the present invention is to provide a digital data recording method capable of obtaining a disk-shaped recording medium in which data can be reproduced independently for each frame period obtained in the form of a video signal. shall be.

Means for Solving the Problems A digital data recording method according to the present invention that achieves the above-mentioned object performs interleaving with an error correction code added to the digital data to be recorded in units of a predetermined amount, This digital data is encoded to form unit encoded data having the above-mentioned predetermined amount as content, and then each of the formed unit encoded data is subjected to digital-to-analog conversion and then converted into a video signal. A frame recording signal is obtained by mixing digital-to-analog converted unit coded data with horizontal and vertical synchronizing signals arranged in a plurality of horizontal video periods within one frame period, and then The frame recording signal is recorded so as to correspond to one revolution of a spiral or annular recording track on a disk-shaped recording medium.

Operation In the digital data recording method according to the present invention, when recording digital data in the form of a video signal on a disk-shaped recording medium in which a spiral or annular recording track is formed, a spiral or annular recording track is formed. Interleaving is applied to the digital data in units of the amount arranged in one frame period in the form of a video signal recorded in the video signal, and the unit of the interleaved digital data obtained as a result is
The video signal is converted into a frame period video signal and recorded so as to form one round of a spiral or annular recording track.

Therefore, when reproducing digital data from a solid disk-like recording medium on which no digital data has been recorded based on such a recording method, one frame period of video read from one revolution of a spiral or annular recording track is used. The digital data converted from the signal can be deinterleaved and decoded by itself, and the reproduction of digital data from a disk-shaped recording medium can be performed using a spiral or annular recording track. This can be done independently for each round.

Example Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a recording device for implementing the digital data recording method according to the present invention in a block connection configuration, and with reference to an example of such a recording device, the method for implementing the digital data recording method according to the present invention will be explained. I will explain in detail.

In FIG. 1, a data generating section 1 is configured using, for example, a microprocessor, and generates digital data D to be recorded, such as information containing procedures for causing a computer to control the operation of a video disc player. Send out. Further, the control unit 20 is formed of, for example, a control computer, and sends various control signals to each block, which will be described later, to perform preset control on them.

Then, the digital data D sent from the data generation section 1 is taken into the memory 2 according to the memory control signal Sm from the control section 20 supplied to the control end of this memory 2, and then, similarly according to the memory control signal Sm, The captured digital data D is read out from the memory 2 at a predetermined timing in units of a predetermined amount, for example, n blocks each consisting of m bits. n-program unit DU of digital data D read from this memory 2
are supplied to the error correction code generation section 3, which generates an error correction code based on each of the n block units DU of the digital data D under the control of the code generation control signal Se from the control section 20. Generate and add.

Next, each of the n block unit DUE of the digital data D to which the error correction code has been added is processed by the interleave processing unit 4.
Here, under the control of the interleave control signal Si from the control unit 20, for each of the n block unit DUE of the digital data D to which the error correction code has been added, the n Interleaving is performed between blocks and error correction codes. Then, the unit data ID containing the n-block unit DUE of the interleaved digital data D obtained from the interleave processing unit 4 is sequentially supplied to the encoder unit 5, and the encoded control signal from the control unit 20 is sent to the encoder unit 5. Each unit data ID is encoded under the control of Sc.

In this encoding, for example, an encoding format as shown in FIG. 2 is formed for one unit data ■D. This encoding format consists of, for example, 483 consecutive data segments DS each having a 16-byte (128-bit) configuration (
In FIG. 2, for convenience, the starting and ending ends of each data segment DS are shown aligned. ), and these 483 data segments DS form one data frame DF. Each data segment D
In S, 1-byte leader mark data Lm indicating the start of the data segment DS is placed at the starting end, followed by a 15-byte data section. The first and second data segments DS in each data frame DF are provided with belly mark data Hm indicating the start of the data frame, and the following (
3rd, 4th and 5th data segment)D
At the beginning of S, content identification mark data Cm used to identify the content of the subsequent digital data is arranged, and the subsequent fifth data segment DS
A unit data ID is arranged from the middle of 2 to the 482nd data segment DS, and trailer mark data Tm indicating the end of the data frame is arranged at the 483rd, that is, the last data segment DS.

By encoding each unit data ID obtained from the interleave processing unit 4 based on such an encoding format, n-block units DU of digital data D are obtained.
can be encoded into one data frame by interleaving with an error correction code added thereto, and the encoder section 5 sequentially obtains unit coded data CD.

Subsequently, the unit coded data CD obtained from the encoder section 5 is sequentially fetched into the memory 6 according to the memory control signal Sm' from the control section 20 supplied to the control end of the memory 6, and then each fetched unit is encoded data CD
are sequentially read out from the memory 2 at predetermined timing under the control of the memory control signal Sm' and supplied to the mixing section 7. Then, in the mixer 7, other digital data to be recorded supplied from the terminal 8, for example, an audio signal related to a still image to be played back on a video disc player, is converted into PCM, as needed.
The encoded audio data SFA is mixed, and then, in the digital-to-analog conversion section (conversion section to D-) 9, under the control of the analog conversion control signal Sa from the control section 20, the data is sequentially read out from the memo +76. The unit encoded data CD is converted into mixed audio data SFA as necessary.
It is also converted into an analog signal AD.

Then, the analog signal AD obtained in this way is supplied to the mixing section 10, and in this mixing section 10, the terminal 11
Horizontal synchronization signal SH and vertical synchronization signal S supplied from
V, and further includes a color burst signal and a color video information signal as required.

In mixing this analog signal AD and video signal V, each unit coded data CD read out from the memory 6
The unit analog conversion outputs obtained by analog conversion by the digital-to-analog converter 9 are arranged in a plurality of horizontal periods within one frame period consisting of a first field period and a second field period of the video signal V. The frame recording signal DVF is obtained from the output end of the mixing section 10 in this manner.

In this case, for example, the first to second data segments of each data segment DS in the encoding format as shown in FIG.
Up to 62 horizontal lines are respectively the first
They are sequentially arranged corresponding to the 21st horizontal period to the 262nd horizontal period in the field, and the 243rd to 483rd horizontal periods are respectively arranged from the 285th horizontal period in the second field within the same frame period. 52nd
They are arranged sequentially corresponding to up to 5 horizontal periods.

In such a case, the frame recording signal DVF obtained from the output end of the mixer 10 is in the first field period, as shown in FIG. 3A (first field period) and B (second field period).
In the field period, the 21st horizontal period and the 22nd horizontal period
The belly button mark data Hm is located in the horizontal period, the content identification mark data Cm is located from the 23rd horizontal period to the middle of the 25th horizontal period, and then from the middle of the 25th horizontal period to the 262nd horizontal period. The first half of the unit data ID is located, and in the second field period, the second half of the unit data ID is located from the 285th horizontal period to the 524th horizontal period, and the trailer mark data is located in the 525th horizontal period. This is where Tm is located.

Note that the analog conversion output obtained by analog conversion of the audio data SFA mixed by the mixing unit 7 by the digital-to-analog conversion unit 9 is performed in a predetermined manner different from that described above, in which each unit coded data CD is converted into digital - It is arranged in a frame period different from the frame period in which the unit analog conversion output obtained by analog conversion by the analog converter 9 is arranged.

Next, in the mixer 12, the address data Fn supplied from the terminal 13 is added to each of the frame recording signals DVF obtained as described above in the first field period as shown in FIG. 3A. It is added to the 17th horizontal period and the 18th horizontal period.

In this example, each frame recording signal DVF to which the address data Fn has been added is frequency-modulated by the frequency modulation circuit 14, and is input as a modulation signal to the modulation signal input terminal 32a of the light modulation section 32 in the optical recording device 40. supply

The optical recording device 40 records information on a disk-shaped recording medium using a laser beam, and here, a laser beam emitted from a laser light source 30 is reflected by a mirror 31 and directed to a light modulating section 32. The laser beam is guided and passed through the optical modulator 32, reflected by mirrors 33 and 34, and then focused by a focusing lens 35 and made incident on a disk-shaped recording medium 36.

The light modulator 32 is configured with, for example, an electro-optic modulator that utilizes an electro-optic effect, and modulates the intensity of the laser beam incident from the mirror 31 according to the modulation signal supplied to the modulation signal input terminal 32a. Send. The disk-shaped recording medium 36 is, for example, a disk-shaped base with a photoresist layer provided thereon, and is mounted on a turntable 38 that is rotated by a motor 37 and rotated at a predetermined speed. Then, the photoresist layer of the disk-shaped recording medium 36 is exposed to the laser beam whose intensity is modulated by the light modulator 32 and focused by the focusing lens 35, so that, for example, a large number of bits or bumps are arranged in a spiral pattern. An exposure pattern is formed on the disk-shaped recording medium 36 to form a spiral recording trunk of a modulation signal for the laser beam, that is, a modulation signal supplied to the modulation signal input terminal 32a of the optical modulation section 32. will be recorded.

In this example, the modulation signal supplied to the modulation signal input terminal 32a of the optical modulation unit 32, which is recorded on the disk-shaped recording medium 36 as described above by the optical recording device 40, is recorded in a frame with address data Fn added. Since the signal DVF is a frequency modulated output, each of the frame recording signals DVF with address data Fn added thereto can be recorded on the disk-shaped recording medium 36 by forming a spiral recording trunk.

Then, when recording the frame recording signal DvF to which the address data Fn is added to the disk-shaped recording medium 36, for example, the rotation of the disk-shaped recording medium 36 is controlled, and each address data Fn is added every rotation. The frame recording signal DVF is recorded. That is, each frame recording signal DVF to which address data 'Fn is added is recorded on each round of the spiral recording track formed on the disk-shaped recording medium 36. One frame period of the video signal will be recorded. Also, at this time, address data F
The contents of n are added to the frame recording signal DVF.
The position of one round of the spiral recording track on the disk-shaped recording medium 36 where is recorded, for example, in the radial direction of the disk-shaped recording medium 36 from one round of the recording track at the recording start end of the disk-shaped recording medium 36 up to that point. In other words, it represents the number of one round of the recording track, or the number of frame periods of the video signal recorded up to that point.

In this way, according to the above-described recording method, the digital data D from the data generating section 1 is encoded for each unit amount that is subjected to interleaving in the interleave processing section 4, and digital-to-analog conversion is performed. Thereafter, it can be recorded in the form of a video signal of one frame period in one revolution of a spiral recording track formed on the disk-shaped recording medium 36.

The disk-shaped recording medium 36 on which the digital data D from the data generating section 1 has been recorded as described above can be used for directly reproducing the recorded data, or can be used for transfer molding based on this. It is possible to copy a disc-shaped recording medium on which recording has been performed by, etc. The disk-shaped recording medium 36 obtained based on the above-mentioned recording division method or a duplicate disk-shaped recording medium therefrom has a spiral shape when reproducing digital data recorded on the spiral recording track. For each data read from one round of the recording track, that is, for each data read over one frame period in the form of a video signal, interleaving is performed to remove the interleave, and the original digital data D is restored. It becomes something that can be played.

In the above example, a spiral recording track is formed on the disk-shaped recording medium 36, but instead of a spiral recording track, an annular recording track may be formed. In this case, one round of the annular recording track corresponds to one round of the spiral recording trunk in the above example.

In the above example, the frame recording signal DVF to which address data Fn obtained from the mixer 12 is added is
are frequency-modulated by the frequency modulation circuit 14 and directly supplied to the light modulation section 32 in the optical recording device 40; Rather than recording each frequency modulated output of the frame recording signal DVF added with the address data Fn obtained from the mixer 12 on a magnetic tape or the like, and then recording each frequency modulated output of the frame recording signal DVF added with the address data Fn The frequency modulated output is reproduced from a magnetic tape or the like, and the optical modulation unit 3 in the optical recording device 40
It is also possible to supply it to 2.

Further, in the above example, the address data Fn for each of the frame recording signals DVF performed in the mixing section 12
The addition of is not necessarily necessary.

Furthermore, as a recording device for the disk-shaped recording medium, not only the optical recording device as in the above example can be used, but also various other types of recording devices can be used.

Effects of the Invention As is clear from the above explanation, in the digital data recording method according to the present invention, when converting digital data into a video signal form and recording it on a disk-shaped recording medium with a spiral or annular recording track, , the amount of digital data recorded in one round of a spiral or annular recording track on a disk-shaped recording medium corresponding to one frame period in the form of a video signal is provided for interleaving applied to the digital data. It can be a unit amount. Therefore, according to the digital data recording method of the present invention, digital data is converted into a video signal and recorded on a spiral or annular recording track; When playing digital data,
For each read from one revolution of a spiral or annular recording trunk, that is, for each read with one frame period in the form of a video signal, dinterleaving is performed to remove the interleave and reproduce the digital data. It is possible to obtain a disc-shaped recording medium that is capable of performing the following steps. Also, as a result, when the disc is loaded into a video disc player and subjected to playback operation, the random access reading function of the video disc player is fully utilized, and the played digital data is then transferred to the computer. It is possible to provide a disk-shaped recording medium that facilitates efficient input and various controls.

[Brief explanation of drawings]

FIG. 1 is a block connection configuration diagram showing an example of a recording device for carrying out an example of the digital data recording method according to the present invention, and FIGS. 2 and 3 show the process of the digital data recording method according to the present invention. FIG. 2 is a diagram showing an encoding format and data arrangement for explanation. In the figure, 1 is a data generator, 3 is an error correction code generator, and 4 is a data generator.
1 is an interleave processing section, 5 is an encoder section, 9 is a digital-to-analog conversion section, 10 is a mixing section, 20 is a control section, 32 is a light modulation section, and 36 is a disk-shaped recording medium.

Claims (1)

[Claims] The digital data is interleaved with an error correction code added to the predetermined amount of the digital data, and the digital data is encoded to form unit encoded data having the predetermined amount as the content. Each piece of coded data is digital-to-analog converted and then mixed with horizontal and vertical synchronizing signals of the video signal, so that the digital-to-analog converted unit coded data is distributed over a plurality of horizontal video periods within one frame period. The frame recording signal is recorded on one of the spiral or annular recording tracks on the disk-shaped recording medium.
A digital data recording method that records data in a manner that corresponds to the lap.