JPH0298873A - Optical disk - Google Patents

Abstract

PURPOSE:To shorten the time up to reproduction by recording arrangement information on a data area and a lead-out area in one subchannel of the lead-in area and recording control information including at least arrangement information in other subchannels. CONSTITUTION:There are the lead-in area 1, the data area 2 where a musical sound signal is recorded, and the lead-out area 3 which indicates the end of the optical disk on the disk from the inner periphery to the outer periphery. When the arrangement information is recorded in R-W channels of the lead-in area 1 as control information, the same data with a table-of-contents TOC as the arrangement information in the data area 2 are recorded in the R-W channels. Thus, the arrangement information is also recorded repeated in the lead-in area, and consequently the arrangement information is obtained immediately wherever in the lead-in area the information is reproduced. Consequently, the time up to the disk reproduction is shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an optical disc that is continuously recorded or reproduced on a time axis.

Conventional technology In recent years, compact discs (hereinafter abbreviated as CDs),
Optical discs for recording video and music, such as laser discs, are becoming more and more popular, and as the quality improves, demands for more advanced usage are increasing.

The conventional example of the above-mentioned optical disc will be explained below with reference to FIGS. 2 and 3.

FIG. 2 is a correlation diagram between the structure of a conventional CD and recorded data. The CD has a lead-in area 11. from the inner circumference to the outer circumference. a data area 12 in which music signals are recorded;
There is a lead-out area 13 indicating the end of the disc.

FIG. 3 is a schematic diagram of signals recorded on a CD.

In FIG. 3, (a) is a schematic diagram of a frame which is the minimum unit of recording, (b) is a schematic diagram of a subcode frame,
(C) is a schematic diagram of the Q channel data format in the lead-in area, and (d) is a schematic diagram of the back.

The operation of the CD configured as described above will be explained below.

The CD has 735 frames per second as shown in Figure 3(a).
Recorded on the disc at a rate of 0. (2) A frame consists of a 1-byte subchannel storage area 42, a 32-byte main channel storage area 43, and a frame synchronization area 41.

Two channels of audio data quantized with a sampling frequency of 44°1K HZN and a quantization bit number of 1θ bits are divided into 24-byte units as main data, and are stored in the main channel storage area 4 along with an 8-byte error detection and correction code.
Recorded in 3. In the subchannel storage area 42, 1 byte of sub data called a subcode is recorded. Each bit of one byte of the subcode corresponds to a channel, and these channels are called P channel, Q channel, and ++-1W channel. That is, eight subchannels exist in the subchannel storage area 42.

A subcode frame is composed of a subchannel storage area 42 for 98 consecutive frames. There are 75 subcode frames per second. This situation is shown in FIG. 3(b). A subcode frame synchronization 44 is formed in the subchannel storage area 42 for the first two frames, and subchannels from the P channel to the W channel are recorded in the subchannel storage area 42 for the remaining 96 frames.

The P channel 45 is a flag used to locate the beginning of a track (a track usually corresponds to a song), and in the data area 12 it is set to 1 for 2 seconds or more before each track starts. Further, in the lead-out area 13, 1 and 0 are repeated at a cycle of 2 seconds.

Search information for searching within the disc is recorded in the Q channel 45. An address is recorded in the Q channel of the data area 12 as search information. The address contains an absolute time that starts at the beginning of the data area 12 as 0 minutes, 0 seconds, and 0 frames, and increases toward the outer circumference, and a relative time that starts at the beginning of each track as 0 minutes, 0 seconds, and 0 frames.
There are track numbers (song numbers), each of which is a BCD.
It is recorded in code (binary coded decimal number). The frame referred to here is a unit of time, and 75 frames corresponds to one second. That is, a frame as a unit of time is equal to the time length of one subcode frame. The track number is fixed at 001 in the lead-in area 11 and AA (IE ternary notation) in the lead-out area 13. The CD player detects this track number (AA) and finishes playing the CD. In the data area 12, the track number /(- can take a value from 01 to 99. For example, on a disc with 6 tracks recorded, each track has a value of 01.021.
, , O8 track numbers are given. Absolute time and relative time are also recorded in the lead-out area 13. The absolute time in this area is recorded continuously from the data area 12, and the relative time is set to 0 minutes, 0 seconds, and 0 frames at the beginning of the lead-out area 13. In the Q channel 46 of the lead-in area 11, arrangement information of the data area 12 and lead-out area 13 is recorded as search information. This location information is stored in TOC (Table of Contents).
ts), in which the absolute time of the beginning of each track in the data area 12, the first and last track numbers of the data area 12, and the absolute start time of the lead-out area 13 are recorded.

The CD player first reproduces the lead-in area 11 to obtain the TOC information recorded on the Q channel and stores it in its internal memory. CD players store T in memory.
Using the time information recorded in the OC and the Q channel of the data area 12, any track can be accessed at high speed.

A specific TOC recording method will be described below with reference to FIG. 3(C). The figure shows Q in the lead-in area 11.
This diagram schematically represents a 96-bit data structure within one subcode frame of a channel. In the control area from bit 0 to bit 3, information such as whether emphasis processing is to be performed on the digital audio of the corresponding track is recorded. ADR from bit 4 to bit 7 has (0001
) are recorded. 00, which is the track number of the lead-in area 11, is recorded in the track number. M.I.
N, SEC, and FRAME indicate the relative time in the lead-in area in minutes, seconds, and frames, respectively. bit 48
O is recorded in the next 8 bits. The 16 bits starting from bit 80 are CRC (Cyclic
Redundancy Check) code is recorded. Points, PMINl PSEC, PFRA
TOC is recorded using 4 bytes of ME. When a point takes a value from 01 to 99 in BCD code, the start absolute time of the track indicated by the point is recorded in minutes, seconds, and frames in PMIN, PSEC, and PFRAME, respectively. For example, points, PMIN, PSE
C and PI”RAME respectively on 09.43.2012
If it is 4, the 9th track is 43 minutes 20 seconds 24 in absolute time.
Indicates that it starts from the frame. Point is A
If it is O (in hexadecimal notation), 01, which is the track number of the first music track of the CD, is recorded in PMIN. At this time, PSEC and PFRAME are OO
is recorded. If the point is A1 (in hexadecimal notation), the track number of the last music track on the disc is written in PMIN.

will be recorded. At this time, PSEC and PFRAME are OO
is recorded. For example, if a disc has 10 songs recorded on it, the PMIN will be 10. PMIN if the point is A2 (in hexadecimal).

The start address of the lead-out area 13 is recorded in absolute time in PSEC1 PFRAME. The CD player uses this value to display the total playing time of the data area 12 of the CD. The same content is recorded in three consecutive subcode frames. For example, the TOC of a CD on which 10 pieces of music are recorded is recorded using 39 consecutive subcode frames ((10+3)×3). This T.

C is repeatedly recorded in the lead-in area 11.

Eight subchannels from the R channel to the W channel (hereinafter abbreviated as R-W channel) are treated as one. The 6 bits of the R-W channel are called symbols,
A packet consists of 98 symbols. 1 packet is 24
Divided by symbol, back 47.4 with 24 symbols
Configure 8.49.50. FIG. 3(d) is a schematic diagram of the back, and each back includes a command area 5L of one symbol from the beginning and an instruction area 53.2 of one symbol.
It consists of a symbol parity area 53, a user data area 54 of 18 symbols, and a parity area 55 of 4 symbols. The command area 5 is used to define the recorded content within a symbol, and the upper three bits of the command area are called mode bits, and the lower three bits are called item bits. Mode 0 (000), item O (000) is called 0 mode, and all symbols in the back are O's. Most commercially available discs use this mode. Mode 1 (001) and item 0 (000) are called line gala fix modes and are used to display data recorded in the bag using a 288 x 24 dot line display.

Mode 1 (001) and item 1 (001) are called television graphics modes, and record data necessary to display a 288 x 192 dot graphic screen. CD graphics karaoke machines using this mode are commercially available for commercial use.

To summarize the above, the recorded contents of each area of the CD are as shown in FIG. That is, flags are recorded on the P channel, which is a subchannel, over the entire CD. The Q channel has placement information in the lead-in area 11 and data area 1.
Addresses are recorded in 2 and the lead-out area 13.

Further, in the R-W channel, data for subcode graphics is recorded in the data area 12 of some discs, and no valid data is recorded in the lead-in area 11 and the lead-out area 13. On the other hand, in the main channel, audio information such as music is recorded in the data area 12, and no valid data is recorded in the lead-in area 11 and lead-out area 13.

(For example, "Book to Enjoy Laser AV 120%" Nippon Bunkosha 74-78 Beno, Published Patent Publication January 19, 1986)
871).

Problems to be Solved by the Invention However, in the above-mentioned conventional example, the R-W channel is used for recording data to be reproduced simultaneously with audio, such as graphics data for karaoke. That is, only the R-W channel of the data area 12 is used, and no data is recorded in the R-W channel of the lead-in area 11, so that it is not used effectively. Also, using the Q channel with a slow data transfer rate, TOC
The problem was that it took a long time to read the TOC because the TOC was being recorded. For example, if Hyakunin Isshu was created using 99 tracks, it would take at least 4 seconds just to read the TOC. Furthermore, since the Q channel data error compensation function is only an error detection function using a CRC code and has no correction capability, it was necessary to wait an additional 4 seconds if an error occurred in three consecutive subcode frames.

Means for Solving the Problems In order to solve the above problems, an optical disc of the present invention records at least a signal in which a main channel for recording main data and a plurality of sub-channels for recording sub-data are time-division multiplexed. It has a lead-in area, a data area, and a lead-out area in order, and one of the lead-in areas
Arrangement information of the first data area and the lead-out area is recorded in one subchannel, and management information such as the arrangement information and content information is recorded in one or more other subchannels of the lead-in area. It has a configuration.

Effect of the Invention With the above-described configuration, the present invention realizes an optical disc that makes effective use of data and expands the functions of the disc, maintains complete compatibility with conventional discs, and takes a short time to play the disc.

Embodiment Hereinafter, a case where the optical disc of the first embodiment of the present invention is realized by applying a CD will be described with reference to FIGS. 1 and 3. FIG. 1 is a correlation diagram between the structure of an optical disc and recorded data in an embodiment of the present invention. As in the conventional example, this optical disc has a lead-in area 1, a data area 2 where music signals are recorded, and a lead-out area 3 indicating the end of the disc from the inner circumference to the outer circumference.

In this embodiment, a case will be explained in which arrangement information is recorded as management information in the R-W channel of the read-in area 1.

The format of the signal recorded on the disc is shown in FIG. Regarding the data recorded in each area shown in FIG. 1, except for the R-W channel of lead-in area 1,
Since everything is the same as the conventional example, the explanation will be omitted.

The R-W channel contains T, which is the arrangement information of data area 2.
Record the same data as OC. Mode 2 (010), which is currently undefined, is in the command area 51 of the R-W channel.
Use item 0 (000), etc. The instruction area 52 is set to 1 (000001) to indicate that the bag has placement information recorded thereon. The user data area 54 has a data amount of 12 bytes (16 symbols x 6 bits/8 bits). As shown in the conventional example, TOC
Data is 4 bytes (point) of Q channel of l subcode frame, PMIN, PSEC.

PFRAME) is used. Three types of TOC data are recorded in this user data area 54 having a capacity of 4 bytes. Since one packet consists of four packets, 12 times as much data as TOC data can be recorded. Parity areas 53 and 55 are provided in the R-W channel to enable error detection and correction, and there is no need to repeatedly record the same packet for data protection as in the alternating Q channel.

Therefore, the time the player takes to get the TOC into memory is 36 times faster than with a conventional CD. By repeatedly recording the arrangement information recorded in the R-W channel within the lead-in area, the arrangement information can be immediately obtained no matter which position within the lead-in area is reproduced.

Next, an example of the procedure for reproducing the optical disc of this embodiment will be explained.

When playing this optical disc on a conventional CD player, the Q channel TOC is first read. on the other hand,
A player created on the premise of playing back this optical disc first reads the arrangement information recorded in the R-W channel. After that, any player can play any track according to instructions from the outside. In conventional CDs, the R-W channels in lead-in area 1 are recorded in O mode, so conventional CD players are not aware of the R-W channels in this area. That is, conventional CD
It is possible to realize an optical disc that can read the TOC at high speed while maintaining complete compatibility with the optical disc.

As described above, according to this embodiment, an optical disc records a signal in which a main channel for recording main data and a plurality of subchannels for recording sub data are time-division multiplexed.
A lead-in area, a data area, and a lead-out area are provided from the inner circumference to the outer circumference, and arrangement information of the first data area and the lead-out area is recorded in one subchannel of the lead-in area, and By recording management information including the arrangement information in one or more other subchannels of the in area, the arrangement information can be read at high speed. For example, on a CD with 99 songs recorded,
In this embodiment, the TOC reading time, which had a sandy quality of about 4 seconds, is reduced to about 0.1 seconds. In the above embodiment, a specific method of recording the arrangement information in the R-W channel of the lead-in area has been described, but of course there are various other methods. For example, in the user data area 54, 4 bits from the R channel to the U channel are used,
Various methods can be considered, such as recording TOC data for two subcode frames in one bag.

Next, as a second embodiment, an optical disc according to claim 2 of the present invention will be described. This embodiment is also the same as the first embodiment (for the case where a CD is used as the optical disc, the first
This will be explained with reference to FIGS.

This embodiment is the same as the first embodiment except for the R-W channel in the lead-in area 1, so a description thereof will be omitted. R-
Content information regarding the recorded contents of the optical disc is recorded in the W channel. The command area 51 of the R-W channel uses the same values as in the first embodiment. The instruction area 52 is set to 2 (000010). Content information is recorded in the user data area 54. The content information here is information specific to the disc, and indicates data that does not need to be output simultaneously with the audio. An example of content information is shown below.

1) CD title 2) Name of the music recorded on each track.

3) Description of the song 4) Introduction of the performer 5) Playback control program that controls how the CD is played 6) Font data used to display characters These content information are loaded into the player's memory before the CD is played. , displayed on a display device in response to an external request or a playback control program. By repeatedly recording this content information in the lead-in area in the same way as the arrangement information shown in the first embodiment, it is possible to immediately obtain the content information no matter which position within the lead-in area is played back. I can do it.

As described above, according to the present embodiment, an optical disc for recording signals obtained by time-division multiplexing of a main channel and a plurality of subchannels is provided with a lead-in area, a data area, and a lead-out area, and For example, by recording the arrangement information of the data area and the lead-out area in one subchannel, and recording the content information regarding the recorded content of the optical disc in one or two other subchannels of the lead-in area. Display the song title and let the player user refer to the song title! (You can select the desired song or read the introduction of the performer while playing 8, greatly expanding the scope of use of the optical disc.This content information is recorded in character code and stored in the character ROM built into the player. read-only memory) and content information 1
For example, font data recorded on an optical disk can be converted into bitmap data and displayed, or recorded as run-length compressed graphic data.
Various methods are possible. The playback control program is a program that is interpreted and executed by the microprocessor in the player, and describes playback methods depending on the optical disc. Of course, as shown in the first embodiment, these optical discs can be played back with a conventional player without any problem.

In the above two embodiments, a CD is used as an example of the optical disc, but the optical disc is not limited to a CD, and can be an optical disc with an unused subchannel such as a lead-in area, a data area, and a lead-out area. The above-mentioned functions can be easily achieved with an optical disc that has the following functions. For example, it is possible to apply the present invention to laser discs and CDV (combination disc video) discs that can record audio in a format similar to CDs.

Of course, it is also possible to record both the arrangement information and the content tI\ information as management information.

Effects of the Invention As described above, the invention provides a main channel for recording main data and a plurality of sub-channels for recording sub-data on an optical disc that records time-division multiplexed signals, sequentially a lead-in area, a data area, and a lead-out. recording area, and recording arrangement information of the first data area and the lead-out area in one subchannel of the lead-in area,
By recording management information including the placement information in one or more other subchannels of the lead-in area, the lead-in area can be used effectively and the placement information can be read at high speed, reducing the time required for playback. can be shortened. Furthermore, for conventional systems, the pilot disk is equivalent to a normal optical disk, and there are no inconveniences in playback.

Further, according to claim 2, by recording content information regarding the recorded contents of the optical disc as management information, the range of use of the optical disc can be greatly expanded.

Further, according to claim 3, by repeatedly recording the management information within the lead-in area, the management information can be read at any position within the lead-in area.

[Brief explanation of the drawing]

Fig. 1 is a correlation diagram between the structure of an optical disc and recorded data in an embodiment of the present invention, Fig. 2 is a correlation diagram between the structure of a conventional CD and recorded data, and Fig. 3 is a diagram showing the data format of a CD. FIG. ■...Optical disc, 1, 11... Lead-in area, 2, 12... Data area, 3, 13... Lead-out area, 41... Frame synchronization area, 42... Subchannel storage area, 43... Main channel storage area, 44... Subcode frame synchronization area, 47-50...
・Pack, 51...Command area, 52...Instruction fort M, 53, 55...Parity area, 54...User data area, Name of agent Patent attorney Shigetaka Awano Hakako name R)> The banknotes are also broken X+ n1;'1

Claims (3)

[Claims] (1) At least a signal is recorded in which a main channel for recording main data and a plurality of sub-channels for recording sub-data are time-division multiplexed, and a lead-in area, a data area, and a lead-out area are sequentially provided. The arrangement information of the data area and the lead-out area is recorded in one subchannel of the in-area, and the management information including at least the arrangement information is recorded in one or more other sub-channels of the lead-in area. optical disc. (2) At least a signal obtained by time-division multiplexing of a main channel for recording main data and a plurality of sub-channels for recording sub-data is recorded, and a lead-in area, a data area, and a lead-out area are sequentially provided, and the Recording arrangement information of the data area and lead-out area in one subchannel of the in-area, and recording management information including at least content information regarding recorded content in one or more other sub-channels of the lead-in area. An optical disc featuring (3) The optical disc according to claim 1 or claim 2, wherein the management information is repeatedly recorded within the lead-in area.