KR900006367B1 - Information recording disc with composite index codes - Google Patents

Abstract

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Description

Recording Disc with Composite Index Code

1 is a diagram showing the division of recording areas of a composite disc;

2 is a diagram showing the frequency spectrum of a signal recorded in the video area of a composite disc;

3 is a diagram showing division of information recording areas in a composite disc;

4 is a diagram showing a recording method of an index code in an area that is a lead of a composite disc according to the present invention;

5 is a block diagram showing the configuration of a composite disc player;

FIG. 6 is a diagram showing the division of memory areas in RAM in FIG.

7 is a flowchart showing an operation sequence of a player executed by a CPU.

* Explanation of symbols for main parts of the drawings

1: Composite Disc 2: CD Area

3: video area 5: pickup

7: CD area demodulation circuit 8: Video area demodulation arc

15: CPU 16: RAM

19: slider motor.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a recording disk, in particular a composite-colored recording disk with a composite color, in which the index code related to the recorded contents is repeatedly recorded in the lead area.

As a disk on which a digital signal is recorded, a small digital audio disk having a diameter of about 12 cm, called a compact disk (CD), is known. However, in recent years, a FM-modulated video, in addition to a PCM (Pulse Code Modulation) signal, has the same dimensions as the disk. Discs (hereinafter, referred to as composite discs) recorded by superimposing signals and PCM signals have been developed.

In the case of this composite disc, for example, an FM modulated video signal and a PCMized audio signal are recorded by overlapping the first area on the inner circumferential side where audio information is PCMized and recorded, and the area on the outer circumferential side rather than the sowing radius position. The information is recorded by dividing the area into the second area.

However, in compact discs, in order to enable special playback such as search and skip, information such as an index code related to the recorded contents, for example, the number of recorded songs, the total absolute time, and the playing time for each song, etc. The recording information of the lead area is read before reproduction of the program information at the time of reproduction, but the same can be said to enable special reproduction even in a composite disc.

In the case of a composite disc, however, since the recording area is divided into two, a lead area is provided in each area, and different information is recorded in each area. Therefore, two types exist for each area as an index code. will be. With respect to these two types of index code, it is necessary to record not only the area of the lead of the corresponding area but also the area of the lead of other areas in order to enable special playback and the like over both areas. In recording the code in the same lead area, a recording method effective in reproduction is desired.

SUMMARY OF THE INVENTION The present invention has been made in view of the foregoing, and an object of the present invention is to provide a composite index coded recording disc in which two types of index codes corresponding to a recording area are recorded by a recording method which is effective in reproduction.

The composite disc with the composite index code according to the present invention has, on at least one surface, a first area in which only a predetermined digital signal is recorded, and a second area in which a frequency-modulated video signal and a predetermined digital signal are superimposed and recorded. In each lead area of the area, the first and second index code groups formed by repetition of the index code respectively related to the recording contents of each area are recorded, and each index code of the index code group has its own. The identification information which indicates the area which belongs is included, and is mixed.

EXAMPLE

EMBODIMENT OF THE INVENTION Next, one Example of this invention is described in detail based on drawing.

The composite disc 1 according to the present invention shown in FIG. 1 includes, for example, a first area (hereinafter referred to as a CD area) 2 on the inner circumferential side in which audio information is recorded by PCM, and an FM modulated video signal. It has a second area (hereinafter referred to as a video area) (3) recorded by superimposing the PCMized audio signal. The video signal contains a higher frequency component than the PCM signal and is recorded in the video area (3). The frequency spectrum of is as shown in FIG. In the figure, the component indicated by A is a PCM signal, and the component indicated by B is a video FM signal. For this reason, it is necessary to increase the rotational speed of the disc when recording signals to the video area 3 as compared with when recording to the CD area 2, and as a result, as a result, it is natural that the disc is compared with the CD area 2 even during playback. The disc should be played with the rotational speed of the disc in the area 3 increased. As shown in Fig. 3, the rotational speed is several hundred rpm in the CD region 2, whereas in the video region 3, the rotational speed is very high at two thousand several hundred rpm at the innermost periphery of the region and one thousand hundred rpm at the outermost periphery. Speed.

Each leading portion of the CD area 2 and the video area 3 is provided with a lead area, each of which is an index code relating to the recording contents of each area, for example, each element constituting each area. In accordance with the repetition of the index goose indicating the start and end time of the part, the first and second index code groups configured corresponding to each area are recorded. The index code group is formed by repetition of the index code because it is possible to read the index code from other parts even if the index code of any part cannot be read by a so-called dropout or the like.

As a recording method of the index code in the lead area, the first index group corresponding to the CD area 2 is first recorded, and then the second index group corresponding to the video area 3 is recorded. I think the way of writing. However, when reproducing a disc recorded with an index code in this recording method, for example, if there are many index codes related to the CD area 2, it takes time to read the index code related to the video area 3; There is a fear that the player's standing will be late.

Thus, in the present invention, identification information indicating an area (CD area / video area) to which the index code belongs is assigned to each index code of the first and second color index groups, and the respective areas of the group within the lead area are assigned. Even if the index codes are mixed, for example, a recording method that alternately records each index code is adopted. That is, in order to simplify the notation, the index code of the CD area 2 is denoted by I, and the index code of the video area 3 is denoted by J, and the subscripts of the index code are indicated by subscripts of each lower case letter. As shown in Fig. 4, the index code of the CD area 2 and the index code of the video area 3 are alternately recorded in the lead area as shown in FIG. In addition, although the index codes of the respective areas are identified by I and J by simplifying the notation, in reality, each index code has identification information indicating its own area, for example, the index code of the CD area 2 is "1". , The index code of the video area 3 contains identification information of "4", respectively.

Next, a configuration of a player for playing such a composite index coded recording disc will be described.

In FIG. 5, the disk 1 is rotationally driven by the spindle motor 4, and the recording information is read by the optical pickup 5. As shown in FIG. The pickup 5 includes a laser diode as a light source, an optical system including an objective lens, a port director for receiving the reflected light from the disk 1, and a focus for controlling the position of the objective lens with respect to the information recording surface of the disk 1; An actuator, a tracking actuator for controlling the position of the disc radial direction with respect to the recording track of the beam spot emitted from the pickup 5, and the like are incorporated.

Each read RF (high frequency) signal of the CD area 2 and the video area 3 from the pickup 5 is passed through the separation circuit 6 to the CD area demodulation circuit 7 and the video area demodulation circuit 8. Supplied to each.

The demodulation output of the CD area demodulation circuit 7 is supplied to the data separation circuit 9 so that the index code data recorded in the lead area is separated and extracted, and a predetermined signal processing is performed in the signal processing circuit 10. It is a reproduction signal. Similarly, the demodulation output of the video area demodulation circuit 8 is supplied to the data separation circuit 11, so that the index code data recorded in the lead area is separated and extracted, and the predetermined signal processing is performed in the signal processing circuit 2. To become a playback signal.

The switching switches 13 and 14 are switched in response to the reproduction area by the CPU (central processing circuit) 15, and the switching switch 13 separates the index code data separated and extracted by the data separating circuits 9 and 11. Alternatively, it is supplied to the RAM 16, and the switching switch 14 alternatively outputs the output of the signal processing circuits 10 and 12 to the outside as a reproduction signal. When the data separation circuits 9 and 11 separate the index code data recorded in the lead-in area, the index code data for detecting and separating the identification information included in the index code data is stored in the recording contents of the CD area. An identification signal is sent to the CPU 15 indicating whether it is related data (first index group) or data related to the recording contents of the video area (second index group).

As shown in FIG. 6, the memory area of the RAM 16 is divided into _two areas, M ₁ and M ₂ , and the CPU 15 identifies from the data separation circuits 9 and 11. The index code data stored in the RAM 16 is distributed in response to the signal, for example, the data relating to the recording contents of the CD area to the area M ₁ , and the data relating to the recording contents of the video area to the area M ₁ . ₂ ) Control to be memorized. As a result, data is stored alternately in the memory areas M ₁ and M ₂ of the RAM 16 at the time of reproduction of the disc on which information is recorded in both the CD area 2 and the video area 3.

In the playback of the player, an area, a function, and the like to be reproduced from the operation unit 17 are designated to the CPU 15, whereby the CPU 15 stores the memory area M ₁ or M ₂ of the RAM 16 based on the designated information. The tracking drive circuit which selects and also calls the information required to execute each function from the selected memory area M ₁ or M ₂ and drives the tracking actuator in the pickup 5 on the basis of the data, for example. As a drive source for moving the furnace 18 and the pickup 5 in the radial direction of the disc, a control signal is sent to the slider drive circuit 20 or the like for controlling the drive of the slider motor 19.

Next, the operation procedure of the player executed by the CPU 15 will be described according to the flowchart of FIG. First, if the index code data in the lead area is read prior to reproduction (step S ₁ ), the read index code is related to the recording contents of the CD area 2 (first index code group). it is determined whether or not applied (step S _2). This determination is made based on the identification information (for example, "1" for the CD area and "4" for the video area) included in the read index code. In the case of the CD area, the read data is stored in the memory area M1 of the RAM 16 (step S ₃ ), and then the next index code is read (step S _4. ) it is determined whether or not the data is related to whether the recorded contents of the CD area (2) (step S _5). If the read data is related to the recording contents of the video area (second index code group), the data is stored in the memory area M ₂ of the RAM 16 (step S ₆ ), and then the first index data is stored. If the reading of the code group has ended (step S ₇ ) or if the reading of the second index code group has ended (step S ₈ ), the process returns to step S ₁ . and it repeats the above operation until it is determined that ends at step (S _7, S _8).

First and second if the index Code Group Index Code data read are closed in the, it is determined whether or not to play back operation is completed (Step S _9), if not terminated, continuously determines the designated play area (step S _10), if when specifying the CD area to execute a reproducing operation of the CD area (step S _11), specify the video area to run (step S ₁₂₎ to execute a reproduction operation of the video area, then step ( S ₉ ). If it is determined in step S ₉ that all of the series of reproducing operations are completed.

In step (S _5), when it is determined that the CD area is not stored in the consecutive index Code index Code of the first group. Since such a disc has no information recorded only in the CD area, the index code data is read to the last part of the first index group, and the data is stored in the memory area M1 of the RAM 16. (step S _13, S _l4), after the reading of all data ends Index Code executes a playback operation of the CD area (2) (step S _5).

On the other hand, in the case where it is determined in step S ₂ that the video area belongs to the video area, the read data is stored in the memory area M ₂ of the RAM 16 (step S ₁₇ ), and the next index code data is subsequently read out. (Step S ₁₈ ), it is determined whether the read data is related to the recorded contents of the CD area 2 (Step S ₁₉ ). When it is determined that the read data is in the CD area, the data is stored in the memory area M1 of the RAM 16 (step S ₂₀ ), and then the processing proceeds to step S ₇ . In addition, in the step (S _19), if it is determined that the video area is not being stored in succession the index Code index Code of the second group. Since such a disc does not have information recorded only in the video area, the index code index code data is read to the last part of the second index group, and the data is stored in the memory area M ₂ of the RAM 16. storage to (step S _21, S _22), all of the index after reading the end of the Code data and executes the reproduction operation of the video area 3 (step S ₂₃₎ to.

As apparent from the above description of the operation, in the area that is the lead of the composite disc 1, each of the areas of the CD area 2 and the video area 3 is recorded and includes identification information indicating the area to which it belongs. By recording the index codes alternately, is the information recorded only in the CD area, the information recorded only in the video area, or both areas only by examining several index codes read before playback? Since it is possible to immediately determine whether or not information has been recorded, the reading time of the player's index code can be suppressed within a certain time regardless of the length of each index code. In the case of a disc in which information is recorded only in a single area, this can also be immediately determined.

In addition, the index code data read before the reproduction of the information is divided and stored into a memory area corresponding to the reproduction area to which it belongs, and when the information is reproduced, the memory area corresponding to the reproduction area is selected, and the reproduction operation is performed based on the storage data. When performing special playback or the like by specifying from the outside by controlling, the address of the index code data can be obtained immediately and the contents can be called immediately. In this case, since the range of RAM area and its internal division are preset, the data used for processing can be called by calculation of a short time.

As described above, according to the present invention, several index codes read at the time of reproduction are reproduced by intermixing index codes including identification information which are related to the recorded contents of each area in the lead area and which indicate the area to which they belong. Since the type of disc to be played back can be immediately determined by simply checking, the reading time of the player's index code can be suppressed within a certain time regardless of the length of each index code. The transition can be done quickly.

Claims (1)

At least one surface has a first area 2 in which only a predetermined digital signal is recorded, and a second area 3 in which frequency-modulated video signals and a predetermined digital signal are superimposed and recorded in each of the areas of these areas. The first and second index code groups I _i , J _j , I _{i + 1} , J _{j + 1} ,... Which are constituted by repetition of the index codes respectively associated with the recorded contents of each area are recorded. And a composite index code attached recording disc (1), characterized in that each index code of these index code groups is mixed including identification information indicating an area to which they belong.

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