JP2001135066A - Optical information recording medium and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical information recording medium where additional information such as graphic information, text information and time information are recorded in parallel to main data in the optical information recording medium which does not have a sub-code area. SOLUTION: In the optical information recording medium, content data is divided in a sector unit and one content pack where content data is recorded is included in one sector. One sub-code pack where sub-code data are recorded for each of the number of content packs, which is previously decided, is time- divisionally multiplexed with the content packs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording medium in which content data such as audio information is divided into sectors, and one content pack in which content data is recorded is recorded per sector. And a reproducing apparatus for reproducing the optical information recording medium.

[0002]

2. Description of the Related Art Conventionally, as a medium for recording and reproducing audio data, a compact disc (hereinafter, referred to as a CD) has been widely used. CD includes P, Q, R, S, T, U, V and W along with audio data.
The subcode data of the channel is recorded.

[0003] In the P channel, a signal for cueing each track (song) is recorded, which is "0" in a lead-in area, "1" between songs in a program area, and "0" in a song. And 2 in the lead-out area
“1” and “0” are repeated at a cycle of Hz.

The Q channel records index information such as a track number indicating a song number, an index number indicating a subdivision thereof, an elapsed time in and between songs, and a continuous elapsed time through a program area and a lead-out area. Used for

The remaining six channels R to W record graphic information and character information.

FIG. 7 is a schematic diagram for explaining a CD modulation method. As shown in FIG. 7, six samples (24
1 byte = 8 bits) audio data
And frame, CIRC for each frame (C ross- I nterl
eave R ead-Solomon 8-byte error correction code by the C ode) is added. That is, the audio data subjected to CIRC modulation has 32 bytes. Also, in order to eliminate burst errors, 3-10
Data exchange is performed between eight frames.

[0007] CIRC-modulated 32 per frame
One byte (8 bits) of subcode data is added to the byte audio data. The 8-bit data to which the subcode data is added is EFM (Eight to Fou
(rteen Modulation) modulation and conversion to 14-channel bit data.

The data of each of the 14 channel bits is connected by 3 connection bits, and 2 bits are added at the head of the data string.
4-bit synchronization signal (SYNC) data and connection bits are added. A square wave signal (EFM signal) that is inverted each time 1 appears based on the channel bit string as described above is generated, and a pit string is recorded on a CD based on the EFM signal.

FIG. 8 is a schematic diagram for explaining a CD demodulation method. The EFM signal read from the CD is EF
M demodulation results in 8-bit subcode data per frame and 32-byte CIRC-modulated audio data. The 32-byte CIRC-modulated audio data is subjected to CIRC demodulation to become 24-byte audio data. On the other hand, 8-bit subcode data is 9 bits.
The sub-code data (98 bytes) for eight frames is collected and decoded as sub-codes of eight channels P to W each consisting of 98 bits.

[0010] Of the eight channel sub-codes, the first two bits are a synchronization signal, and the remaining 96 bits are used as a recording area for index information, graphic information, text information, and the like.

For example, the data of the Q channel includes a 2-bit synchronization signal, a 4-bit control bit, a 4-bit address bit, an 8-bit music number, and an 8-bit music number.
Bit index, min each 8 bits, the absolute time and the 16 bits formed by second and block CRC (C yclic R
edundancy C heck) and an error detection parity.

The control bits are used to distinguish audio data from program data for a CD-ROM (Compact Disc-Read Only Memory). The address bits identify the format of the subsequent bit string. The song number indicates a song number (track number) from 01 to 99 in binary coded decimal. In the lead-in area, the music number is 00, and in the lead-out area, the music number is AA (2
10101010). Index is 2
Indicates an in-tune index number from 00 to 99 in an evolutionary decimal number. The minutes, seconds, and blocks of the elapsed time and the absolute time in the song are each represented by a two-digit binary coded decimal number.
Here, one block is 1/75 second corresponding to a reproduction time for one subcode frame (6 samples × 98 frames).

As described above, the music number, the elapsed time in the music, and the like displayed on the display window of the CD reproducing apparatus are recorded in binary in the program area of the CD in parallel with the audio data as binary-coded decimal data. Therefore, by referring to the Q-channel data of the sub-code, the CD reproducing apparatus can display a music number, time information, and the like corresponding to the audio data being reproduced in real time.

On the other hand, DVDs are used as media having a larger capacity than CDs.
Are already in practical use and are beginning to spread. The DVD has a DVD-ROM (DVD-Read Only) on which computer data is recorded.
Memory), DVD-Video on which video data is recorded, and DVD-Audio on which audio data is recorded.

FIG. 9 is a schematic diagram for explaining a DVD modulation method. The DVD modulation method is different from the CD modulation method described above. As shown in FIG. 9, a data sector of the DVD has a data capacity of 2064 bytes, a 4-byte ID data, a 2-byte ID error detection parity (IED), and a 6-byte future expansion. Reserved bytes (RSV), 2048-byte main data, and error detection parity (ED) of the entire 4-byte sector
C).

A data sector of 2064 bytes per one sector is scrambled, and the 16 scrambled data sectors are regarded as one block to perform ECC (Error Correction).
on Code). The original data of 8 bits per byte to which the ECC is added is subjected to 8/16 modulation, and is converted into data of 16 channel bits. 8 /
The 16-modulated data is divided into 91 bytes (1456 channel bits), a sync code of 32 channel bits is added to the head, and recorded on a disk.

As described above, since the DVD does not have the subcode area provided on the CD, the graphic data, character data, and track number related to the main data are provided in parallel with the main data such as video data and audio data. (Song number) and additional information such as time information cannot be recorded.

Therefore, in order to display such additional information on a display window of the DVD playback device or a display device connected to the DVD playback device, an area in which main data such as video data and audio data of the DVD is recorded. Recorded such additional information in an information file in another area.

FIG. 10 is a schematic diagram for explaining the logical structure of a DVD and file access. The DVD has four areas: a lead-in area, a file management information area, a content recording area, and a lead-out area. Reference codes and control data are recorded in the lead-in area. The reference code is information for facilitating device adjustment such as a focus position or an equalizer characteristic. The control data is information indicating a physical specification of the disk such as a disk type, a disk size, a recording density, the number of information surfaces, and a sector number indicating a data area.
In the file management information area, management information of main data recorded in the content recording area is recorded. In the content recording area, main data such as video data and audio data are recorded as information files. The lead-out area is an area following the content recording area, in which information indicating that the content recording area has ended is recorded.

For example, in DVD-Video, the title numbers follow the description order in the title search pointer table. The title search pointer table is
It is recorded in the video manager in the content recording area. The recording position of the video manager in the content recording area is described in the file management information area.

In order for the DVD playback device to access a file in which a title corresponding to the title number recorded in the video manager is recorded, a basic volume descriptor in the file management information area is read, and the file management information is read. The recording position of the path table in the area is obtained.

Next, the path table is read, and the recording position of the directory information in the file management information area is obtained. Then, the directory information is read, file information relating to the title corresponding to the desired title number is searched, and information such as the recording position and size of the information file is obtained from the searched file information.

Through the above steps, even if the title search pointer table in the video manager of the desired information file is read, the title search pointer table is recorded in the information file of the corresponding title number. The recording position and the recording length of the main data such as the video data and the audio data are not described. The title search pointer table merely describes the address of the area where the management information of the information file corresponding to the title number is described.

Also, since the reproduction speed (transfer speed) of a DVD is not constant like a conventional CD and varies depending on the quality of video data and audio data, the correlation between the amount of data read from the disk and time information is determined. Difficult to take. For this reason, the difference between the time when the main data is started to be output from the DVD reproducing apparatus and the time when the main data is currently output is displayed as the reproduction time, or the difference is recorded in an area different from the area where the main data is recorded. It is necessary to refer to the timetable of each title.

[0025]

SUMMARY OF THE INVENTION The present invention relates to an optical information recording medium having no subcode area, in which additional information such as graphic information, text information and time information is recorded in parallel with main data. The purpose is to obtain a medium.

Another object of the present invention is to provide a reproducing apparatus for reproducing an optical information recording medium in which additional information such as graphic information, text information and time information is recorded in parallel with main data.

[0027]

According to a first aspect of the present invention, there is provided an optical information recording medium, wherein content data is divided into sectors and a content pack in which content data is recorded. Is recorded on the optical information recording medium such that one subcode pack is recorded per sector, and one subcode pack in which subcode data is recorded for each of a predetermined number of the content packs is time-division multiplexed with the content pack. It is characterized by having.

According to a second aspect of the present invention, there is provided the optical information recording medium, wherein the audio data is divided into sectors, and the optical information recorded such that one audio pack in which the audio data is recorded is included per sector. In the recording medium, one subcode pack in which subcode data is recorded for each of a predetermined number of the audio packs is time-division multiplexed with the audio packs.

According to a third aspect of the present invention, in the optical information recording medium according to the second aspect, the number of subcode frames per second of the subcode data is 75.

According to a fourth aspect of the present invention, in the optical information recording medium according to the second or third aspect, the subcode pack includes a 98-byte subcode frame.
It is characterized by having zero.

According to a fifth aspect of the present invention, in the optical information recording medium of the fourth aspect, one subcode pack is time-division multiplexed for each audio pack having audio information for 20 subcode frames. It is characterized by having been done.

According to a sixth aspect of the present invention, in the optical information recording medium according to the first to fifth aspects, the sub-code pack includes a private header in which information indicating a sub-code pack is recorded. It is characterized by having.

According to a seventh aspect of the present invention, in the optical information recording medium according to the first to sixth aspects, the subcode information is information indicating a track number, an index number, or a reproduction time. And

According to the invention described in claim 8 of the present application, in the reproducing apparatus, the content data is divided into sectors, and the content data is recorded so that one content pack is recorded per sector, and is determined in advance. Demodulation for demodulating content data and subcode data read from an optical information recording medium in which one subcode pack in which subcode data is recorded for each of the given number of content packs is time-division multiplexed with the content pack. Means, a sub-code buffer for holding sub-code data, and a sub-code decoder for demodulating the sub-code data output from the sub-code buffer.

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, embodiments of the optical information recording medium and the reproducing apparatus of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram illustrating a configuration of an information area of an optical information recording medium according to one embodiment of the present invention. In the present embodiment, a DVD-Audi
This is explained using o as an example. As shown in FIG. 1, the information area of the optical information recording medium of this embodiment includes a lead-in area, a file management information area, a content recording area, and a lead-out area from the inner circumference.

The lead-in area, the file management information area, and the lead-out area are the same as those of the above-mentioned DVD, and thus the description is omitted. The content recording area includes an audio manager (AMG) and a plurality of audio
It is composed of title sets (ATS # 1 to #n). The audio manager records management information for managing each audio title set.

FIG. 2 is a schematic diagram showing a logical structure of an audio title set of an optical information recording medium according to one embodiment of the present invention. Each audio title set is
It is composed of a plurality of audio packs and a plurality of subcode packs. One subcode pack is time-division multiplexed with an audio pack for every predetermined number of audio packs.

Here, the maximum bit rate of the DVD-Audio audio data is “JAS Journal, March, 1988, N
o.4 "and so on. The maximum transfer rate after variable transfer rate control is defined as 10.08 Mbps as a physical specification of DVD. Therefore, the bit rate of composite data including audio data and data other than audio data must not exceed 10.08 Mbps.

The maximum sampling frequency of audio data recordable on DVD-Audio is 192 kHz, and the maximum number of quantization bits is 24 bits (for two channels). The bit rate of the audio data at this time is 192,000 (Hz) × 24 (bit) × 2 (ch) = 9,216,000 (bps) (Equation 1), which is approximately 9.2 Mbps.

In DVD-Audio, the sampling frequency of audio data to be recorded is 48 kHz, 96 kHz.
kHz, 192 kHz, 44.1 kHz, 88.2 kHz
It is specified to use either z or 176.4 kHz, which is different from a single sampling frequency of 44.1 kHz as in a conventional CD.

In the optical information recording medium of this embodiment, one subcode frame size at each sampling frequency is
In order to make it the same as D, it is individually defined as in the table shown in FIG. FIG. 3 is a table showing the number of samples per subcode frame at each sampling frequency of the optical information recording medium according to one embodiment of the present invention.

In the case of a CD, the number of subcode frames per second is 75. Therefore, the number of subcode frames per second of the optical information recording medium of this embodiment is set to 75, which is the same as that of a CD. The number of bytes required for one subcode frame was 98 bytes, the same as for a CD. By doing so, when generating the subcode data, the conventional CD
Can be generated with the same equipment as when generating subcode data for use. Further, the subcode data used for the conventional CD can be used as it is.

As shown in FIG. 3, when one sub-code frame size is defined, the bit rate of the sub-code data is 75 (pieces) × 98 (bytes) × 8 (bits) = 58,800 (bps). Equation 2)

Here, the bit rate of audio data under the condition of (Equation 1) (sampling frequency 192 kHz, number of quantization bits 24 bits, number of channels 2) is about 9.2 Mbps. Even if this audio data is time-division multiplexed with the subcode data of (Expression 2) to generate composite data, the bit rate per second is 10.0.
It can be kept below 8 Mbps.

Next, the logical structure of the audio pack and the subcode pack shown in FIG. 2 will be described. FIG.
FIG. 2 is a schematic diagram for explaining a logical structure of an audio pack of the optical information recording medium according to one embodiment of the present invention. As shown in FIG. 4, a PCM audio signal recorded on a disk is divided into sectors, and one audio pack on which a PCM audio signal is recorded is included per sector. One audio pack is 2048 bytes.
Each audio pack includes one audio packet. Each audio pack includes a pack header of the audio pack, a packet header of the audio packet, and a private header describing attributes of the audio data.

FIG. 5 is a schematic diagram for explaining the logical structure of a subcode pack of an optical information recording medium according to one embodiment of the present invention. As shown in FIG. 5, the subcode pack is 2048 bytes, like the audio pack.
The subcode pack includes a pack header (14 bytes) of the subcode pack and a packet header (up to 17 bytes) of the subcode packet.

Therefore, the subcode data is recorded using the remaining 2017 bytes. Here, since the size of one subcode frame is 98 bytes, the following expression is obtained: 2017 / 98３20.58 (Equation 3), and a maximum of 20 subcode frames is included in one subcode pack. , And a space of 57 bytes is further provided. The 57 bytes are assigned to a private header, and a substream ID (sub_stream_id) is recorded so as to be recognized as a subcode packet.

As described above, since 20 subcode frames can be provided in one subcode pack, the number of samples per subcode frame at each sampling frequency shown in FIG. 3 is multiplied by 20. If one sub-code pack is inserted for each audio packet for a sample, the sub-code data recorded in one sub-code pack and the sub-code pack and the previous or next sub-code pack are inserted. The correlation with the audio data recorded in the audio pack between them can be obtained.

Here, “correlation can be obtained” means that, when time information is recorded as subcode data, the time information recorded in one subcode data is the subcode pack and the previous or next subcode pack. This corresponds to audio data recorded in a plurality of audio packs between the packs.

For example, when audio data having a sampling frequency of 192 kHz and a quantization number of 24 bits, which is a condition of (Equation 1), is recorded in an audio pack,
The number of bytes for one sample of audio data is 24 (bits) / 8 (bits) × 2 (channels) = 6 (bytes) (Equation 4). If the area used for audio data in one audio pack is 2000 bytes, 1
Since the number of samples per subcode frame is 2560, 2560 (samples) × 6 (bytes) × 20 (pieces) / 2000 (bytes) = 153.6 (Equation 5), which is recorded in one subcode pack The number of audio packs for which subcode data can be correlated is 153.
Individual. That is, as shown in FIG. 2, one subcode pack is inserted for every 153 audio packs.

Since the capacity of audio data for 20 subcode frames is not always a multiple of the capacity of one audio pack, the last audio pack for 20 subcode frames includes: Dummy data is recorded in the remaining area after the last audio data. An audio packet on which dummy data is recorded is called a padding packet.

Next, a reproducing apparatus for reproducing the optical information recording medium of the embodiment described above will be described. FIG.
FIG. 1 is a schematic diagram illustrating a schematic configuration of a playback device according to one embodiment of the present invention. In the figure, 1 is an optical disk, 2 is a pickup,
Reference numeral 3 denotes a signal demodulation demultiplexer, 4 denotes an audio buffer, 5 denotes a DA converter, 6 denotes an amplifier, 7 denotes a speaker, 8 denotes a subcode buffer, 9 denotes a subcode decoder, and 10 denotes a display device.

The optical disk 1 has a logical structure in which one subcode pack is inserted for each of the 153 audio packs described above. , An index number indicating a subdivision thereof, an elapsed time in and between music pieces, and a continuous elapsed time through the program area and the lead-out area.

The optical disk 1 is placed on a turntable (not shown) of the reproducing apparatus, and is rotated by a spindle motor (not shown). The pickup 2 reads reference data and control data recorded in a lead-in area of the optical disc 1. When a playback instruction of a desired track is issued from an operation unit (not shown), the pickup 2 reads information recorded in the file management information area, moves to a recording position of a file in which audio data of the desired track is recorded, The audio pack and the subcode pack recorded in the file are read.

The signal demodulating multiplexer 3 outputs a sub-stream ID (sub_stre) recorded in the private header of the read audio pack and sub-code pack.
am_id), the demodulated audio data is output to the audio buffer 4, and the demodulated subcode data is output to the subcode buffer 8.

The audio data input to the audio buffer 4 is output from the audio buffer 4 according to a PTS (Presentation Time Stamp) described in a packet header of each audio pack, and is output from a DA (Digi).
The signal is DA-converted by a tal / Analog converter 5, amplified by an amplifier 6, and output from a speaker 7. The audio buffer 4 stores the audio data of the next audio pack when the free space increases by the amount of the output audio data and a sufficient capacity for storing the audio data of one audio pack is secured.

The subcode buffer 8 has a capacity of one subcode pack (2048 bytes). After storing the subcode data of one subcode pack, the subcode buffer 8 holds the data until the next subcode pack is read by the pickup 2. When the next subcode pack is read by the pickup 2, the subcode buffer 8 outputs the subcode data held so far to the subcode decoder 9, and stores the subcode data of the next subcode pack. .

The sub-code decoder 9 demodulates the input sub-code data and displays the demodulated signal on the display device 10.
(For example, a display window provided in the playback device or a display device such as an external monitor). The display device 10 displays a track number, an index number, an elapsed time, and the like.

In the optical information recording medium of this embodiment, data identifying sub-code data is recorded in a private header in a sub-code pack. for that reason,
Even when the optical information recording medium of this embodiment is reproduced by a reproducing apparatus having no subcode data reproducing function, the data of the private header recognizes that the subcode pack is different from the audio pack. Therefore, the optical information recording medium of the present embodiment can be reproduced without any problem even in a reproducing apparatus having no subcode data reproducing function.

[0060]

According to the present invention, in an optical information recording medium having no subcode area, graphic information,
An optical information recording medium in which additional information such as text information and time information is recorded in parallel with main data can be obtained.

Further, according to the present invention, it is possible to provide a reproducing apparatus for reproducing an optical information recording medium in which additional information such as graphic information, text information and time information is recorded in parallel with main data.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a configuration of an information area of an optical information recording medium according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a logical structure of an audio title set of an optical information recording medium according to an embodiment of the present invention.

FIG. 3 is a table showing one subcode frame size at each sampling frequency of the optical information recording medium according to one embodiment of the present invention.

FIG. 4 is a schematic diagram for explaining a logical structure of an audio pack of the optical information recording medium according to one embodiment of the present invention.

FIG. 5 is a schematic diagram for explaining a logical structure of a subcode pack of the optical information recording medium according to one embodiment of the present invention.

FIG. 6 is a schematic diagram showing a schematic configuration of a reproducing apparatus according to an embodiment of the present invention.

FIG. 7 is a schematic diagram for explaining a CD modulation method.

FIG. 8 is a schematic diagram for explaining a CD demodulation method.

FIG. 9 is a schematic diagram for explaining a DVD modulation method.

FIG. 10 is a schematic diagram for explaining a logical structure of a DVD and file access.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical disk 2 Pickup 3 Signal demodulation demultiplexer 4 Audio buffer 5 DA converter 6 Amplifier 7 Speaker 8 Subcode buffer 9 Subcode decoder 10 Display device

Claims (8)

[Claims] 1. An optical information recording medium in which content data is divided into sectors and one content pack in which content data is recorded is included per sector. An optical information recording medium characterized in that one subcode pack in which subcode data is recorded is time-division multiplexed with the content pack. 2. An optical information recording medium in which audio data is divided into sectors and one audio pack in which the audio data is recorded is recorded per sector, and a predetermined number of the audio packs are recorded in the optical information recording medium. An optical information recording medium, wherein one subcode pack in which subcode data is recorded every time is time-division multiplexed with the audio pack. 3. The optical information recording medium according to claim 2, wherein
An optical information recording medium, wherein the number of subcode frames per second of the subcode data is 75. 4. The optical information recording medium according to claim 2, wherein said subcode pack has 20 98-byte subcode frames. 5. The optical information recording medium according to claim 4, wherein
An optical information recording medium, characterized in that one subcode pack is time-division multiplexed for each audio pack having audio data for 20 subcode frames. 6. The optical information recording medium according to claim 1, wherein said sub-code pack includes a private header in which information indicating a sub-code pack is recorded. recoding media. 7. The optical information recording medium according to claim 1, wherein the subcode data includes a track number,
An optical information recording medium, which is information indicating an index number or a reproduction time. 8. Content data is divided into sector units, and a content pack in which content data is recorded is recorded so as to be included in each sector, and subcode data is recorded for each of a predetermined number of said content packs. Demodulating means for demodulating content data and subcode data read from an optical information recording medium in which one recorded subcode pack is time-division multiplexed with the content pack; a subcode buffer for holding subcode data; A reproducing apparatus comprising a subcode decoder for demodulating subcode data output from a subcode buffer.