CN1305066C - Method of recording on recording medium - Google Patents

Abstract

There is provided a recording medium comprising: a program area in which digital data including a title, main data and sub data is blocked and recorded in a variable number of sectors, and a single sector has a preset data length; and a management area in which an identifier for distinguishing a variable sector number is recorded so as to make the data amount of the sub data variable while the data amount of the main data in the packet remains unchanged.

Description

Method of recording on recording medium

This application is a divisional application of an invention patent application with an application date of April 9, 1999, an application number of 99104888.1, and an invention title of "recording medium and playback device".

technical field

The present invention relates to a method of recording on a recording medium in which data can be recorded in a plurality of unit blocks through headers, main data and sub data, and can be changed without reducing the recording capacity of the main data. The record capacity of the sub data in it.

Background technique

In a conventional recording medium, a recording area for a sub data signal read out simultaneously with a main data signal is provided separately from an area for recording a main data signal. These subdata signals, also called subdata or subcodes, are used to record auxiliary information such as graphic information or text data.

In an optical disc (CD, registered trademark), for example, an area for recording sub-data that can be reproduced while reproducing the audio signal is provided separately from an area for recording audio signal data. These sub data include characters, graphics, etc. in addition to such items as music number, index, or playback time. In CD-G (CD-Graphics), for example, graphic information is recorded with 6 bits called sub-data user bits to simultaneously display images or lyrics (karaoke) together with sound.

Meanwhile, since the data transfer rate of sub data is on the order of several kBps (kilobytes per second), such as 5.4 kBps, the graphic information that can be recorded as sub data cannot be expected to be of high quality. This is far below the 64kBps required for so-called streaming playback on the Internet that is now widely used around the world. As far as still images are concerned, the data transmission rates required for displaying high-quality still images encoded in the JPEG (Joint Photographic Experts Group) format or GIF (Graphics Interchange Format) which are widely used today cannot be met.

In order to cope with streaming playback or high-quality still images, a high transmission rate of auxiliary data exceeding 64 kBps is required. However, in order to realize a high transfer rate, it is necessary to set an area for a large amount of side information demand, and as a result, the main data area is reduced. If the main data area is reduced, the net result is reduced music playback time or reduced sound quality.

Contents of the invention

Accordingly, an object of the present invention is to provide a method of recording on a recording medium in which the guaranteed transfer rate is at least higher than the sub-data transfer rate of a conventional CD, which can variably guarantee a higher transfer rate, and provides a repeating method. A playback device in which the sub-data transfer rate can be variably switched when playing back such a recording medium.

Therefore, the present invention provides a recording method for recording on a recording medium, which includes: recording an identifier for distinguishing variable sector numbers in a management area of said recording medium so that data of main data in a packet Make the data amount of the sub data variable while keeping the amount constant; record digital data including titles, main data, and sub data in the program area of the recording medium, the digital data is divided into blocks, and is variable The number of sectors is recorded, and a unit sector has a preset data length.

The data length of the header changes as the variable number of sectors changes.

The recording medium is a disc-shaped recording medium having multiple layers.

Wherein, a multi-quantized digital signal sampled at a preset sampling frequency is recorded on one of the multiple layers of the recording medium, and one of the sampling frequencies is an integral multiple of the preset sampling frequency Digital data of quantized bits is recorded on another one of the multiple layers.

The program area and the management area are provided on the other layer of the multi-layer, and the digital data including title, main data and sub-data in the program area are divided into blocks and divided into variable sectors. The number is recorded, and a single sector has a preset data length, and an identifier for distinguishing the variable number of sectors is recorded in the management area, so that the sub The data volume of the data is variable.

As mentioned above, the transfer rate of the recording medium of the present invention is at least higher than the sub-data transfer rate of the conventional CD, and can ensure a higher variable transfer rate. In addition, the reproducing apparatus according to the present invention can variably switch the transfer rate of sub data when reproducing such a recording medium.

Description of drawings

Figure 1 is a perspective view of a dual-layer optical disc embodying the present invention;

Fig. 2A shows the data structure of the standard mode in which the number of sectors of a single frame is 14/3 (sector/frame);

Fig. 2B shows the data structure of the expansion mode in which the number of sectors of a single frame is 16/3 (sector/frame);

Fig. 3 represents the detailed data structure of the standard mode shown in Fig. 2A;

Fig. 4 represents a more detailed data structure of the expansion mode shown in Fig. 2B;

Figure 5A shows the data structure recorded on the CD layer 101 shown in Figure 1;

Fig. 5 B shows the data structure recorded on the HD layer 102 shown in Fig. 1;

FIG. 6A shows a data structure recorded on the HD layer 102 shown in FIG. 1;

Figure 6B represents a more detailed data structure of the data area shown in Figure 6A;

Figure 6C represents a more detailed data structure of the audio zone shown in Figure 6B;

Figure 6D shows a more detailed data structure of the audio channel shown in Figure 6C;

Fig. 7 is a block diagram of a playback apparatus embodying the present invention.

Detailed ways

Fig. 1 shows the structure of a multilayer disc applied to a playback apparatus of one embodiment of the present invention. The multilayer disc is an optical disc having a diameter of about 12 cm (centimeter) and a thickness of 1.2 mm (millimeter), and has a label surface 105, a CD layer 101, a CD substrate 103, a high density (HD) layer 102 on the upper surface. , HD substrate 104 and the layered structure composed of the readout surface.

As can be seen from the above structure, two layers, a CD layer 101 and an HD layer 102, are formed to serve as recording layers. On the CD layer 101, as in the case of a CD, a 16-bit digital audio signal sampled at 44.1 kHz (kilohertz) is recorded, while on the other layer, that is, on the HD layer 102, a digital audio signal sampled at 2.842 MHz (megahertz) is recorded. ) is a 1-bit digital audio signal subjected to ΔΣ modulation, which is an extremely high sampling frequency, up to 16 times the above-mentioned 44.1kHz.

As for the frequency range, the CD layer 101 has a frequency range of 5 to 20 kHz, while the HD layer 102 can realize a wide frequency range from a direct current component to 100 kHz.

As for the dynamic range, the CD layer 101 can achieve 98dB (decibels) for the entire audio range, and the HD layer 102 can achieve a frequency range of 120dB for the entire audio range.

The minimum pit length of the CD layer 101 is 0.83 μm, while that of the HD layer 102 is 0.4 μm.

The track pitch of the CD layer 101 is 1.6 µm, while that of the HD layer 102 is 0.74 µm.

The readout laser wavelength of the CD layer 101 is 780 nm (nanometer), while that of the HD layer 102 is shorter at 650 nm.

The numerical aperture NA of the optical sensor lens is 0.45 and 0.6 for the CD layer 101 and the HD layer 102, respectively.

In this way, by changing the minimum pit length, track pitch, numerical aperture of the lens, and laser wavelength, the data capacity of the HD layer 102 can be set up to 4.7 GB (gigabytes), compared to the CD layer 101 has a data capacity of 780MB (megabytes).

The ΔΣ modulated 64Fs, 1-bit audio signal recorded on the HD layer 102 is hereinafter referred to as a high-speed 1-bit audio signal.

Since the digital signal with the same recording structure as the current commercially available single-layer optical disc is recorded on one layer of the dual-layer optical disc, the digital signal of the recording structure on the other layer is higher in quality than the current commercially available single-layer optical disc. Therefore, at least the CD layer 101 can be reproduced by CD players currently sold all over the world, and the playback device designed to adapt to the HD layer can reproduce both the CD layer 101 and the HD layer 102. .

A playback device adapted to the HD layer can play back currently commercially available single-layer optical discs.

The two channels of the above-mentioned high-speed 1-bit audio signal (64Fs, 1 bit, Fs is 44.1kHz) are equivalent to 705600 bytes (705.6kB (kilobytes))/second, that is, if 1 second is equivalent to 75 frames, Then each frame is equivalent to 9408 bytes. Therefore, in order to record 3-frame signals, 28224 bytes are required, and in order to record main data using sectors of 2048 bytes per sector, 14 sectors (28672 bytes) or more are sufficient.

According to the present invention, the recording capacity per unit time of supplementary data (sub data) for recording auxiliary information such as graphic information is changed without changing the quality of the audio signal recorded as main data.

Specifically, such a mode in which the number of sectors is set to 14 is set as the standard mode, and together with the header H as the sub data S, the recording capacity 448 (=32768-28224) excluding the main data M is used.

In addition, such a mode in which the number of sectors is set to 16 is set as the extended mode, and together with the header H as the sub data S, the recording capacity 4544 excluding the main data M having a fixed data amount (=28224 bytes) is utilized (=32768-28224).

2A and 2B show large unit block data BL of a layer including a plurality of small unit blocks Bs for standard mode recording and extended mode recording, respectively. Each small unit block Bs includes header H, sub data S and main data M recorded in the data area 2 of the optical disc shown in FIG. 5B.

With such an optical disk, the data amount of main data M in the small unit block Bs is fixed, while with respect to the large unit block as a unit, the number of sectors of the small unit block Bs is variable, such as 14 or 16 sectors, as shown in FIGS. 2A and 2B , so that the data amount of the sub-data S is variable.

In summary, as shown in FIG. 2A, the large unit block BL recorded in the data area in the standard mode includes 14 sectors, and each sector includes 2048 bytes. The sector-based data amount of the main data M in each small unit block Bs is 2016 bytes of the above-mentioned 2048 bytes. Therefore, the data amount of the main data M in the large unit block BL in the standard mode is 2016×14=28224 bytes. The amount of data of 28224 bytes is evenly distributed in the three frames F1, F2 and F3 of the above-mentioned three small unit blocks Bs, so 9408 bytes are allocated to each of the three frames.

As shown in FIG. 2B, the large unit block BL recorded in the data area in the extended mode includes 16 sectors. The data volume of the sector-based main data M in each small unit block Bs is 1764 bytes in 2048 bytes, and the main data volume of the large unit block BL in the extended mode is 1764×16=28224 bytes, which is the same as Same as in standard mode. Similarly, the data volume of 28224 bytes of the main data M is evenly distributed in the three frames F1 to F3 of the small unit block Bs, so 9408 bytes are allocated to each of the frames F1 to F3.

On the other hand, the data volume of the sub-data S in the large unit block BL increases under the extended mode, and there is a gap between the number of sectors of the large unit block BL under the standard mode and the sector number of the large unit block BL under the extended mode. The difference, that is, 2 sectors (2048×2=) 4096 bytes. In fact, the number of general header H is also increased by 2, and a data amount of 10 bytes is allocated to the header H, so that the increased data amount is 4086 bytes.

3 and 4 respectively show the detailed format of the large unit block BL in the above standard mode and in the extended mode.

In FIG. 3 , the first frame F1 in the small unit block Bs includes the number of bytes from the head of the main data of the sector 1 to the 1344th byte of the main data of the sector 5 . That is, in the first frame F1 of the main data M, the 1344th bytes in sector 1 to sector 5 are dividedly recorded. The data size of the header H of the first small unit block Bs is 3 bytes, ie, 8 bytes, larger than the headers (5 bytes) of other sectors in the same small unit block Bs. The data amount of the header H will be explained below. Since the header of sector 1 is 3 bytes larger than other headers, the subdata of sector 1 is 3 bytes less than the 27 bytes of other subdata, or 24 bytes. The reason is that, as shown in Fig. 2A, the header plus subdata are fixed.

The second frame of the second small unit block Bs in FIG. 3 includes 672 bytes from the 1345th byte of the sector 5 main data to the 672nd byte of the sector 10 main data. That is, in the second frame F2 of the main data, a data amount of 9408 bytes is dividedly recorded in 672 bytes of sector 5, 2016×4 (=8064) bytes of sectors 6 to 9, and sector 672 bytes for zone 10. As for the data amount of the second header H, since the leading sector 5 of the small unit block Bs needs to express the data required to indicate the time code indicating the start of the frame in the main data, sub data, and two main data, a total of 3 packets, , the data size of the second header H is 10 bytes, which is more than the 8 bytes of the header of sector 1, which requires data for sub-data and one main data, a total of 2 packets and a time code indicating the start of the frame quantity. Since the header of sector 5 is 5 bytes more than other headers (5 bytes), the subdata of sector 5 is 22 bytes, which is 5 bytes less than the 27 bytes of other subdata.

The third frame F3 of the third cellet Bs in FIG. 3 comprises data from the remaining 1344 bytes, ie from the 673rd byte of the sector 10 main data until the end of the sector 14 main data. That is, the third frame of main data records a data amount of 9408 bytes dividedly into 1344 bytes of sector 10 and 2016×4 (=4064) bytes of sectors 11 to 14 . The data amount of the header H of the small unit block Bs is 10 bytes because it is necessary for data describing a time code indicating the start of a frame of main data, sub data, and two main data, a total of 3 packets. Because the header of sector 10 has 5 bytes more than other headers (5 bytes), so the sub-data of sector 10 is exactly 22 bytes, as in the second small unit block Bs, than the data amount of other sub-data 27 bytes is 5 bytes less.

Thus, for the large unit block BL in the standard mode shown in FIG. 3, the total number of main data M for 3 frames is set to 28224 bytes, and the total number of sub data S is set to 365 bytes.

In FIG. 4 , the first frame in the first small unit block Bs includes data from the beginning of the main data of sector 1 up to the 588th byte of the main data of sector 6 . That is, the first frame F1 of the main data has a data amount of 9408 bytes, that is, the total amount of data up to sector 6 of the 588th byte. That is, the first frame F1 of the main data has a data volume of 9408 bytes, which is the total up to sector 6 of 588 bytes. On the other hand, the data size of the header H of the first small unit block Bs is 8 bytes, which is 3 bytes more than the headers of other sectors of the same small unit block Bs, that is to say, it is equivalent to indicating the frame start in the main data. The number of timecodes. Since the header of sector 1 is 3 bytes more than other headers, the subdata of sector 1 is 276 bytes, which is 3 bytes less than the 279 bytes of other subdata, because as shown in Figure 2B, the header plus The upper subdata is a fixed quantity.

On the other hand, the second frame F2 of the second small unit block Bs in FIG. 4 includes the remaining 1176 bytes from the 589th byte of the sector 6 main data to the 1176th byte of the sector 11 main data. That is, the second frame F2 of the main data divides and records 9408 words at 1176 bytes of sector 6, 1764×4 (=7056) bytes of sector 7 to sector 10, and 1176 bytes of sector 11 The amount of data in the section. In addition, the header H of the second small unit block Bs needs to describe the data amount of the time code indicating the frame start of 3 packets of main data and sub data and two main data, so that the data amount of the header H is 10 bytes, which is larger than The 8 bytes of the header of the sector 1 that require two packets of sub data and one main data and the data amount of the time code indicating the start of the frame is 2 bytes more. Since the header of sector 6 has 5 bytes more than other headers (5 bytes), the sub-data of sector 6 is 274 bytes, which is 5 bytes less than the 279 bytes of other sub-data.

in addition. In FIG. 4 , the third frame F3 of the third cell block Bs includes the remaining 588 bytes from the 1177th byte of the main data of the sector 11 until the end of the main data of the sector 16 . That is, the third frame F3 of main data records a data amount of 9408 bytes in 588 bytes of sector 11 and 1764*5=8820 bytes of sectors 12 to 16 . The header H of the third small unit block Bs has a data amount of 10 bytes because the leading sector 11 of the small unit block Bs needs a time code indicating the frame start of 3 packets of main data and sub data and two main data. Because the header of sector 11 has 5 bytes more than 5 bytes of other headers, the data volume of the sub-data of sector 11 is exactly 274 bytes, as in the case of the above-mentioned second small unit block Bs, compared with 279 bytes of other sub-data The amount of data in bytes is 5 bytes less.

Thus, the large unit block BL in the extended manner shown in FIG. 4 sets the total number of main data of 3 packets to 28224 bytes, and sets the total number of sub data to 4451 bytes.

Therefore, by constituting the large unit block BL with 16 sectors, the data amount of 4451 bytes per 3 frames, that is, 4451*75/3=111275 bytes (111.275kB)/second can be used as a sub Data S. This means that for the extended mode, the data volume of the sub-data S can change to 12 times of the data volume of every 3 frames of sub-data S365 bytes in the standard mode, that is to say, for the large unit block BL, 365*75/3=9125 words section (99.125kB)/second, or 9.125kBps in terms of transfer rate, where the large unit block BL is composed of 14 sectors.

And meanwhile, in the compact disc (CD) graphic (G) or CD-G that is generally used at present, such as karaoke, wherein 6 bits of sub-data R to W are used for graphic information, the amount of data per second is 96×6× 75/3=5400 bytes, which is equivalent to 5.4 kBps in terms of transmission rate, making the transmission rate of the extended mode reach a level of more than 20 times that of CD-G.

It should be pointed out that in the case of streaming playback currently widely used in the Internet, that is to say, when the graphic information transmitted through the Internet is written into RAM (Random Access Memory) and replayed immediately, a transfer rate exceeding 64kBps is adopted. . The transmission rate of the above-mentioned extension method is sufficient for this transmission rate, so that it is also sufficient for use as a medium for a sender who is sending a graphic signal on the Internet.

Meanwhile, in the above-mentioned standard mode and extended mode, the length of the header H is variable because the data amount of the subdata S is variable, but the header plus the subdata is constant.

If the header length H is represented by the number of bytes, then

Number of header bytes=1 byte+(N_Packets)×2 bytes+(N_Audio_Start)×3 bytes.

In this equation, write in the first byte: how many packets a sector has, how many frames have restarted timecode, and the type of each data for the number of packets. N_Packets is a variable indicating the number of packets included in one sector, and N_Audio_Start is a variable indicating the number of restarted audio frames in the sector. A 3-byte timecode is required for any newly started audio frames.

For example, the data size of header H of sector 6 in Fig. 4 is

1 byte+(3_Packets)*2+(1_Audio_Start)*3 bytes=10 bytes.

In addition, as shown in FIGS. 2A and 2B, since the start position of the main data M in one sector, that is to say, the byte position is a constant, it is possible to easily take out the left side of the main data recorded on the optical disc as the main data from the optical disc. channel and right channel, totaling the data of the two channels.

The method for distinguishing the above two modes, the standard mode and the extended mode, from each other has already been explained. The following explanation uses a hybrid optical disc having both a high-density recording layer (HD layer) for recording high-speed 1-bit audio signals and a CD layer for recording audio signals for optical discs as a specific example.

First, a hybrid optical disc is explained with reference to FIGS. 5A and 5B. In this hybrid disc, the main preparation for the HD layer shown in FIG. 5B can be performed by high-speed 1-bit audio signal, while the CD sound prepared at the same time can be recorded on the CD layer shown in FIG. 5B. This enables hybrid discs, like conventional CDs, to be played back on conventional CD players. Viewed from the inner peripheral side to the outer peripheral side, the CD layer and the HD layer are each provided with a lead-in area, a data area and a lead-out area.

As discussed above, the HD layer has identifiers for distinguishing the two modes, ie, the standard mode and the extended mode, from each other in the management area of the data area. The management area of the HD layer will be explained below with reference to the detailed format diagram of FIG.

The data area shown in Fig. 6 A comprises: two-channel stereo area, is used for recording sound with the high-speed 1 bit audio signal of two-channel stereo; And multi-channel area, is used for recording multi-channel sound, as shown in Fig. 6 B . The data area also includes: a file system area; a main directory area in which a table of contents (TOC) indicating the type of the entire optical disc is recorded; and an extra data area.

Auxiliary information, such as the above-mentioned graphic information, is recorded as sub-data in the two-channel stereo area. This binaural region has two-channel stereo audio tracks, which includes n tracks (tracks 1, 2, 3, . . . , n) shown in FIG. Between two zone tracks (zone TOC-1 and zone TOC-2).

The HD layer of the hybrid disc uses two areas TOC (area TOC-1 and area TOC-2) as management areas, recording identifiers as mode distinguishing information for distinguishing sub-data with variable controlled data amounts. Although both area TOCs (area TOC-1 and area TOC-2) are used as management areas, only TOC-1 or area TOC-2 is sufficient. The above identifier can also be written in the main TOC area as the management area.

If the above-mentioned identifier recorded in the management area is read by the optical disc playback device shown in FIG. 7 to grasp the above-mentioned standard mode or extended mode, then the user can reproduce graphic information at a transfer rate of 9.125kBps or 111.275kBps.

With reference to Fig. 7, this optical disk replaying apparatus comprises: optical readout device 11, such as pick-up, produces readout signal from the HD layer of hybrid optical disc 1; The demodulation decoder 18 is used to demodulate and decode the large unit block BL of the playback data from the radio frequency amplifier 13; and the data separator 19 is used to decode the large unit from the demodulation decoder 18 The main data M and sub data S are separated in the block BL. The playback apparatus also includes a separation controller 20 for controlling the data separator 19 by discriminating information according to the manner recorded in the management area, such as the above-mentioned area TOC-1 and area TOC-2.

The optical disk playback device 10 also includes: a phase-locked loop (PLL) circuit 17, which is used to generate a clock signal synchronous with the playback signal from the radio frequency amplifier 13; The error playback signal of the radio frequency amplifier 13 follows the optical disc 1; the focus driver 15 is used to drive the focus coil included in the optical readout device 11; each driver 16 is used to drive the tracking coil or screw mechanism; the timing generation circuit 21 is used to a CLV (Constant Linear Velocity) to rotate the optical disk with a playback signal from the radio frequency amplifier 13; The disc playback device 10 further includes a spindle motor for receiving CLV control information from the CLV processor 22 to drive the disc to rotate at the CLV.

The optical disk playback device 10 also comprises: a controller 23, which is used to decipher the sub-data from the data separator 19, so that the graphic information is displayed on the display device 24, which is connected to the controller 23 for this purpose; means 30 ; memory 29 and a D/A (digital/analog) converter 25 for converting the main data M from the data separator 19 . The optical disc playback device 10 also includes a volume controller 26 for controlling the volume of the analog audio signal under the control of the controller 23 , the amplifier 27 and the speaker 28 .

The optical readout device 11 includes an objective lens, a laser, a detector, a focusing coil, and the like. The focus driver 15 is controlled by the servo signal processing circuit 14 . The optical pickup device 11 includes, in addition to the above components: a tracking coil for driving the objective lens along the radial direction of the optical disc 1; and a screw mechanism for driving the optical system along the radial direction of the optical disc. The coils are directly driven by the drivers.

The servo signal processing circuit 14, the PLL circuit 17, the demodulation decoder 18, the data separator 19, the separation controller 20, the timing generation circuit 21, and the CLV processor 22 may be included in a digital signal processor.

The operation of the above-mentioned optical disk reproducing apparatus 10 will be explained below. In the following explanation, it is assumed that the HD layer 102 of FIG. 1 is to be played back. The optical disc 1 is clamped so that the optical disc 1 is driven to rotate by the spindle motor 12 . The optical readout device 11 reads out recorded information from the optical disc 1 rotating at CLV to generate a readout signal.

The read signal converted by the detector of the optical read device 11 is sent to a radio frequency amplifier 13 . The radio frequency amplifier 13 converts the read signal into a playback signal, while simultaneously generating a tracking error signal and a focus error signal from the read signal to send the error signals to a servo signal processor 14 .

The servo signal processor 14 drives the focus driver 15 and the respective drivers 16 so as to reduce the tracking error signal and the focus error signal to zero.

The reproduced signal from the radio frequency amplifier 13 is sent to the demodulation decoder 18 and the PLL circuit 17 . The demodulator 18 demodulates and decodes the reproduced signal to send the large unit block BL of FIGS. 2A, 2B, 3 and 4 to the data separator 19.

The data separator 19 separates main data M and sub data S from the large unit block BL data. On the other hand, the separation controller 20 converts the identifier information from the large-unit block BL data readout mode as the above-mentioned identifier to identify whether the large-unit block BL data is recorded in the standard mode or the extended mode, so as to control the data separator 19 The separation operation in .

Since the data splitter 19 can send sub-data recorded in a preset manner, the controller 23 can display graphic information on the display device 24 at a transmission rate of 9.125 kBps or 111.276 kBps.

Thus, in an optical disk having a data area of the format shown in FIGS. 2A, 2B, 3 and 4, only the data amount of supplementary data can be changed without changing the data amount of main data recorded in a unit time. Since a transfer rate at least higher than that used for the sub-data of the optical disc is guaranteed as the transfer rate for the sub-data of the optical disc, all types of applications using the CD sub-code can be realized. Internet applications are possible in a manner that achieves transfer rates exceeding 64kBps. As a way beyond the standard way, display of a high-quality still picture and karaoke application based on a high-quality still picture are also possible.

Also, in any case, only the transfer rate of the auxiliary information can be switched according to the mode, while the constant recording specification and high sound quality of the music data as main data are maintained. In addition, since there is only one recording standard for a source used as a sound source, it is not necessary to provide a formulating mechanism for a plurality of recording standards. Source management of sound sources is simplified because there is no need to monitor multiple recording specifications. The design of formulaic devices clustered around the recorder is also simplified as there is only one type of recording specification.

Claims (5)

1. recording method of on recording medium, writing down, it comprises:

Record is used to distinguish the identifier of variable sector number in the directorial area of described recording medium, so that make the data volume of subdata variable under the situation that the data volume of master data remains unchanged in grouping;

Record comprises that the numerical data of title, master data and subdata, described numerical data are piecemeals and carry out record with variable sector number in the program area of described recording medium, and sector, a unit has default data length.

2. according to the recording method of claim 1, it is characterized in that: the data length of described title changes along with the change of variable sector number.

3. according to the recording method of claim 1, it is characterized in that: described recording medium is a kind of disc-shape recoding medium with multilayer.

4. according to the recording method of claim 3, it is characterized in that: be recorded in a kind of digital signal of many quantization of default sample frequency sampling on the one deck in the multilayer of described recording medium, and the numerical data of a quantization of sampling with the frequency of the integral multiple of default sample frequency is recorded on another layer in the multilayer.

5. according to the recording method of claim 4, it is characterized in that: be provided with described program area and described directorial area on another layer in described multilayer, the numerical data that comprises title, master data and subdata in the described program area is piecemeal and carries out record with variable sector number, and single sector has default data length, and in directorial area, write down the identifier that is used to distinguish variable sector number, so that make the data volume of subdata variable under the situation that the master data amount in grouping remains unchanged.

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