JP3751386B2 - Continuous information recording method and continuous information reproducing apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a continuous information recording method for recording a plurality of continuous digital information such as compressed moving image data and audio data on an optical recording medium, and a continuous information reproducing apparatus for reproducing the optical recording medium recorded by this method. is there.
[0002]
[Prior art]
As for the video compression algorithm, for example, there is the Moving Picture Coding Experts Group (MPEG) algorithm standardized by ISO (International Organization for Standardization). By using this algorithm, special playback such as fast forward, reverse feed and halfway playback of video is possible. It has become.
[0003]
In this MPEG algorithm, a moving image is reproduced using a prediction error obtained by prediction between motion compensation frames (screens).
[0004]
The motion compensation inter-frame prediction will be outlined.
That is, when reproducing a moving image, the moving image is often an image including some subject. If the subject is stationary, the difference image becomes substantially zero if inter-frame prediction is performed. When the subject has a certain amount of movement, a part of the image including the subject can be cut out, shifted by the amount of movement, and predicted as the image of the next frame. This is called motion compensation interframe prediction.
[0005]
The motion compensation inter-frame prediction is effective for compressing moving image information in that the amount of data is reduced. However, since the information of the previous frame (screen) is always used, the random access function cannot be realized. Therefore, in MPEG, a unit called GOP (Group of Pictures) in which moving images of a plurality of frames are collected is set as a unit that enables independent reproduction.
[0006]
As shown in FIG. 2, which is an explanatory diagram of the present invention, the GOP image includes an intra-coded picture (hereinafter referred to as “I picture”), unidirectional inter-frame prediction. There are three types of coded picture (Predictive-coded picture) (hereinafter referred to as “P picture”) and bidirectional inter-frame predictive coded picture (hereinafter referred to as “B picture”). .
[0007]
The above I picture is an image that is encoded in the still image mode and can be decoded independently, and does not use any other frame information, and therefore can be reproduced independently using only this I picture. A P picture reproduces a moving picture by performing forward motion compensation interframe prediction from a past I picture or P picture. Furthermore, the B picture reproduces a moving image by performing motion compensation prediction from an I picture or a P picture positioned before and after in time. Therefore, neither the P picture nor the B picture can be reproduced alone.
[0008]
In addition, since the first frame to be encoded in each GOP must be an I picture, the first frame of the GOP is an I picture when decoding. In other words, special reproduction is possible by sequentially decoding only the I picture at the head of each GOP.
[0009]
Specifically, as shown in FIG. 10, a plurality of GOPs are continuously recorded in a video sequence having a certain time length. The arrangement of the pictures in this example is not particularly restricted except that the top is an I picture. However, when GOP data, which is the basic unit of MPEG, is recorded on a storage medium such as an optical disk, if GOPs are recorded sequentially in order of time, there is a certain I during special playback such as fast forward playback and reverse playback. There is a problem that a wasteful time is required to seek from the picture to the next I picture, and smooth special reproduction becomes difficult if there is not enough memory buffer matching the transfer rate.
[0010]
Therefore, in order to avoid this problem, in the moving image recording method and moving image reproducing apparatus disclosed in Japanese Patent Laid-Open No. 7-147664 as the first conventional example, only I pictures are continuously formed on the surface side of the optical disc. A P picture and a B picture are recorded in continuous sectors on the back side.
[0011]
Then, by the upper light head for irradiating the laser beam from the front surface side and the lower light head for irradiating the laser beam from the rear surface side, the I picture is reproduced from both the front surface side and the rear surface side during normal reproduction. The B picture and the P picture are decoded in units of GOP, and the moving picture is reproduced without interruption by decoding only the front-side I picture at the time of special reproduction.
[0012]
As a result, normal reproduction can be performed by cooperation of the upper and lower light heads, and special reproduction can be performed quickly by operating the upper light head with a small seek time.
[0013]
In addition, when the ratio of the data length of the I picture and the total data length of the P picture and the B picture deviates from 1: 1 due to a slight change in the compression rate, padding data is added to compensate for this shift. The data lengths of the I picture, the P picture, and the B picture are made uniform.
[0014]
On the other hand, the optical recording / reproducing apparatus disclosed in Japanese Patent Application Laid-Open No. 61-934 as the second conventional example irradiates a plurality of light beams onto an optical recording medium and simultaneously records and reproduces image data on a plurality of tracks. ing. In this apparatus, since the transfer rate of image data can be increased by the number of beams, the amount of information per unit time is larger than that of a single light beam, and higher quality video can be recorded and reproduced. . Therefore, for example, it has been attracting attention as a technology that can realize a video disc device for high-definition video.
[0015]
[Problems to be solved by the invention]
By the way, in the moving picture recording method and moving picture reproducing apparatus in the first conventional example, since the compression rate changes for each GOP as described above, dummy data as padding data is added, and the data length of the I picture for each GOP. And the data length of the P picture and B picture must be the same. However, in this case, an unrecorded area is provided on the optical disc, and there is a problem that the utilization efficiency of the recorded area is lowered.
[0016]
In the second conventional example, image data is recorded and reproduced by dividing it into a plurality of beams. However, as described above, in recent years, frames have been converted into I pictures, P pictures, and B pictures by image compression such as MPEG. Divided. However, since the amount of data for each frame is greatly different, there is a problem that it is difficult to efficiently divide the data into a plurality of beams and perform special reproduction.
[0017]
The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a continuous information recording method and continuous information capable of effectively utilizing recording capacity without adding an unrecorded area to an optical recording medium. To provide a playback device.
[0018]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a continuous information recording method in which a plurality of continuous digital information is recorded on an optical recording medium in order to solve the above problem. And a second recording band consisting of i recording tracks or i recording layers and a second recording band consisting of other i recording tracks or i recording layers. While the first information and the second information are continuously recorded while being exchanged, the exchange of the integrated recording data amount of the first recording band and the integrated recording data amount of the second recording band is performed for each successive digital information. It is characterized by switching so that the difference becomes small. Note that i is a positive integer. Further, “i” for the i recording tracks or i recording layers in the first recording band and the other i recording tracks or i recording layers in the second recording band are the same number. Is shown.
[0019]
According to the above invention, the continuous digital information is divided into the first information and the second information, and the first recording band composed of i recording tracks or i recording layers and the other i recording tracks or The first information and the second information are recorded on the second recording band composed of i recording layers while being switched to each other.
[0020]
That is, the divided first information and second information in one continuous digital information are simultaneously recorded without overlapping either the first recording band or the second recording band.
[0021]
Each time one piece of continuous digital information is recorded, the integrated recording data amount of the first recording band is compared with the integrated recording data amount of the second recording band. Further, based on this comparison result, the divided first information and second information in the next continuous digital information are the difference between the integrated recording data amount of the first recording band and the integrated recording data amount of the second recording band. Is changed so that becomes smaller.
[0022]
As a result, recording can be performed while controlling the integrated recording data amount of the first recording band and the integrated recording data amount of the second recording band to be substantially equal.
[0023]
Therefore, even when one continuous digital information is reproduced, the first information and the second information can be reproduced at the same time, and can be restored to the original continuous digital information by immediately rearranging. . Further, when one piece of continuous digital information is divided as in the prior art, dummy data is not added to make the data length uniform.
[0024]
As a result, it is possible to provide a continuous information recording method that can effectively use the recording area of the optical recording medium without adding an unrecorded area.
[0025]
According to a second aspect of the present invention, there is provided a continuous information recording method according to the first aspect, wherein the continuous digital information is a basic unit of digitally compressed moving image data. The first information is GOP intra-frame encoded image data, and the second information is GOP unidirectional inter-frame predictive encoded image data and bi-directional inter-frame predictive encoded image data. It is characterized by being combined with data.
[0026]
According to the above invention, the first recording includes the data of the intra-frame encoded image in the GOP and the data obtained by combining the data of the unidirectional inter-frame predictive encoded image and the bidirectional inter-frame predictive encoded image data. Recording is performed while being switched to the band and the second recording band.
[0027]
In addition, the replacement is performed for each GOP so that the difference between the integrated recording data amount of the first recording band and the integrated recording data amount of the second recording band becomes small.
[0028]
As a result, recording can be performed while controlling the integrated recording data amount of the first recording band and the integrated recording data amount of the second recording band to be substantially equal.
[0029]
Therefore, when recording compressed moving image data based on the MPEG algorithm, the compression rate differs for each GOP. Therefore, the data amount of the intra-frame encoded image, the data of the unidirectional inter-frame prediction encoded image, and the bidirectional inter-frame prediction Even when the difference in the amount of data combined with the encoded image data constantly changes, the recording area of the optical recording medium can be effectively used without adding an unrecorded area.
[0030]
The continuous information recording method of the invention according to claim 3 is the continuous information recording method according to claim 2, wherein the data of the intra-frame encoded image is the first recording band or the second recording. A control bit indicating which of the bands is recorded is recorded before or after the data of the intra-frame coded image.
[0031]
According to the above invention, the intra-frame encoded image recorded while being switched to the first recording band and the second recording band, the unidirectional inter-frame predictive encoded image, and the bidirectional inter-frame predictive encoded image Based on the control bits, it is possible to easily rearrange the original GOP configuration, whereby normal reproduction of the compressed moving image data based on the MPEG algorithm can be performed.
[0032]
Further, by selecting and connecting only the data of the intra-frame encoded image based on the control bits, special reproduction such as fast-forward, reverse-feed, and intermediate reproduction can be easily performed.
[0033]
The control bit is recorded either before or after the data of the intra-frame encoded image, so that the intra-frame encoded image can be extracted. In addition, since this control bit can usually be composed of 1 bit, it is so small as to be negligible with respect to the data amount of the continuous digital information, and thus has no effect.
[0034]
Therefore, it is possible to provide a continuous information recording method capable of effectively utilizing the recording area of the optical recording medium while ensuring the special reproduction function as well as the normal reproduction for the compressed moving image data based on the MPEG algorithm.
[0035]
According to a fourth aspect of the present invention, there is provided a continuous information reproducing apparatus for reproducing a plurality of continuous digital information by irradiating a plurality of recording tracks or recording layers of an optical recording medium with a plurality of light beams. In the continuous information reproducing apparatus, the continuous digital information is divided into first information and second information, and a first recording band consisting of i recording tracks or i recording layers and other i recording tracks. Alternatively, at least 2 × i light beams are used to reproduce an optical recording medium recorded in a continuous manner while exchanging the first information and the second information with a second recording band composed of i recording layers. A reproducing means for irradiating the optical recording medium to obtain a read signal including the first information and the second information, and replacing the first information and the second information from the read signals of the reproducing means. Continuous Back to digital information is characterized by comprising a continuous information rearranging means for reproducing that.
[0036]
According to the above invention, the continuous digital information is divided into the first information and the second information, and the first recording band consisting of i recording tracks or i recording layers and the other i recording tracks or The first information and the second information are recorded on the optical recording medium while being exchanged with the second recording band composed of i recording layers.
[0037]
When reproducing the optical recording medium, the reproducing means irradiates the optical recording medium with at least 2 × i light beams, and a read signal including the first information and the second information is obtained.
[0038]
Subsequently, the continuous information rearranging means replaces the first information and the second information from the read signal to return to the original continuous digital information and reproduces it.
[0039]
As a result, the first information and the second information can be reproduced at the same time while controlling the switching of the recording to the first recording band and the second recording band, and can be immediately replaced and restored.
[0040]
Therefore, for continuous digital information, an optical recording is recorded in which the first recording band and the second recording band are divided into the first information and the second information in order to effectively use the recording area and are switched to the first recording band and the second recording band, respectively. The medium can be played back at high speed.
[0041]
According to a fifth aspect of the present invention, there is provided a continuous information reproducing apparatus according to the fourth aspect, wherein the continuous digital information is a basic unit of digitally compressed video data. The first information is GOP intra-frame encoded image data, and the second information is GOP unidirectional inter-frame predictive encoded image data and bi-directional inter-frame predictive encoded image data. While the data is combined with the data, it has a selecting means for selecting and connecting only the data of the intra-frame encoded image from the readout signal of the reproducing means, and the output of the continuous information rearranging means While normal reproduction is performed, special reproduction such as fast-forward, reverse-feed, and intermediate reproduction is performed according to the output of the selection means.
[0042]
According to the above invention, the GOP is divided into the data of the intra-frame encoded image and the data combining the unidirectional inter-frame predictive encoded image and the bidirectional inter-frame predictive encoded image, and i recording tracks. Alternatively, the first recording band consisting of i recording layers and the other i recording tracks or the second recording band consisting of i recording layers are continuously recorded on the optical recording medium while being switched. .
[0043]
When this optical recording medium is reproduced, the reproduction means reads out the data including the intra-frame encoded image data and the data obtained by combining the unidirectional inter-frame predictive encoded image and the bidirectional inter-frame predictive encoded image. A signal is obtained.
[0044]
Next, the continuous information rearrangement unit replaces the data of the intra-frame encoded image with the data obtained by combining the one-way inter-frame predictive encoded image and the bidirectional inter-frame predictive encoded image from the read signal. Play back to the original GOP.
[0045]
As a result, since the compression rate differs for each GOP when recording compressed moving image data based on the MPEG algorithm, the data amount of the intra-frame encoded image, the data of the unidirectional inter-frame predictive encoded image, and the bi-directional inter-frame prediction Even when the difference from the data amount of the encoded image data constantly changes, it can be easily reproduced.
[0046]
Here, the present invention has a selection means for selecting and connecting only the data of the intra-frame encoded image from the readout signal of the reproduction means, and the normal information of the moving image is output by the output of the continuous information rearrangement means. Playback is performed. Further, special reproduction such as fast forward, reverse feed and intermediate reproduction is performed by the output of the sorting means.
[0047]
Therefore, it is possible to provide a continuous information reproducing apparatus that does not require a dummy data deleting operation that has been required in the past during normal reproduction of moving images.
[0048]
Further, since it is possible to perform special reproduction by selecting and connecting only the data of the read intra-frame encoded image, a continuous information reproducing apparatus capable of performing special reproduction of a moving image without an access operation such as an unnecessary jump. Can be provided.
[0049]
According to a sixth aspect of the present invention, there is provided a continuous information reproducing apparatus according to the fifth aspect, wherein the data of the intra-frame coded image is the first recording band or the second recording band. Control bit detecting means for detecting the control bit from the read signal of the reproducing means for reproducing an optical recording medium on which a control bit indicating which of the bands is recorded is reproduced, and the control bit detecting means Based on the control bits, the original GOP is exchanged by replacing the data of the intra-frame encoded image with the data of the unidirectional inter-frame predictive encoded image and the bidirectional inter-frame predictive encoded image data. While normal reproduction is performed by returning, only the data of the intra-frame encoded image is selected based on the control bit of the control bit detection means. It is characterized by performing special reproduction by sintering.
[0050]
According to the above invention, the intra-frame encoded image recorded while being switched to the first recording band and the second recording band, the unidirectional inter-frame predictive encoded image, and the bidirectional inter-frame predictive encoded image Based on the control bits, it is possible to easily rearrange the original GOP configuration, thereby providing a continuous information reproducing apparatus capable of normal reproduction of compressed moving image data based on the MPEG algorithm.
[0051]
In addition, a continuous information reproducing apparatus that can easily perform special reproduction of moving images such as fast-forward, reverse-feed, and intermediate reproduction by selecting and connecting only intra-frame encoded image data based on control bits. Can be provided.
[0052]
DETAILED DESCRIPTION OF THE INVENTION
[Embodiment 1]
A continuous information recording method and continuous information reproducing apparatus according to an embodiment of the present invention will be described below with reference to FIGS. In the present embodiment, a moving picture recording method and a moving picture reproducing apparatus based on a moving picture compression algorithm using an MPEG (Moving Picture Coding Experts Group) algorithm standardized by ISO (International Organization for Standardization) will be mainly described.
[0053]
First, in the MPEG algorithm, a moving image is reproduced using a prediction error obtained by prediction between motion compensation frames (screens). The motion compensation inter-frame prediction is effective for compressing moving image information in that the amount of data is reduced. However, since the information of the previous frame (screen) is always used, the random access function cannot be realized. Therefore, in MPEG, a unit called GOP (Group of Pictures) as continuous digital information in which moving images of a plurality of frames are collected is set as a unit that enables independent reproduction. Therefore, a moving image recorded on an optical disc as an optical recording medium is composed of a plurality of continuous GOPs.
[0054]
As shown in FIG. 2, the GOP image includes an intra-frame coded picture (hereinafter referred to as “I picture”), a unidirectional inter-frame predictive coded picture (Predictive-coded picture). There are three types: picture) (hereinafter referred to as “P picture”) and bi-directionally predictive-coded picture (hereinafter referred to as “B picture”).
[0055]
Since the first frame to be encoded in each GOP must be an I picture, the top frame of the GOP is an I picture when decoding. That is, special playback is possible by sequentially decoding only the I picture at the head of each GOP.
[0056]
In the present embodiment, as shown in the figure, one GOP in MPEG is composed of, for example, 15 frames (screens), and the breakdown is one I picture, four P pictures, and There are 10 B pictures. The first is an I picture, which is arranged in the following order: B picture, B picture, P picture, B picture, B picture, P picture,.
[0057]
On the premise of using such an MPEG algorithm, an optical disc recorded by the moving image recording method of the present embodiment will be described first.
[0058]
As shown in FIG. 1, the optical disk 5 of the present embodiment has 2 × i spiral tracks (hereinafter simply referred to as “spiral”) T. ₁ ~ T _2i Here, a plurality of GOPs are recorded as moving image data.
[0059]
That is, each GOP (1 to k) is divided into an I picture as the first information and a P picture and a B picture as the second information. These I picture, P picture and B picture are i spirals T as the first recording band. ₁ ~ T _i Or other i spirals T as second recording bands adjacent to each other. _{i + 1} ~ T _2i Are continuously recorded without overlapping any of the above.
[0060]
The i spirals T ₁ ~ T _i And other i spirals T _{i + 1} ~ T _2i Is adjacent to each other in the present embodiment, but is not necessarily limited thereto, and may not be adjacent.
[0061]
Now, for example, a compression rate of an I picture (hereinafter referred to as “I picture I (1)”) in GOP (1) and nB (1) + mP (1) that combines the B picture and the P picture It is assumed that the data length of the I picture I (1) is longer than the data length of nB (1) + mP (1) including the B picture and the P picture.
[0062]
At this time, it is assumed that the I pictures I (2 to k) of all the subsequent GOPs (2 to k) remain the same spiral T. ₁ ~ T _i And B picture B (2-k) and P picture P (2-k) of GOP (2-k) in the same spiral T _{i + 1} ~ T _2i When the data is recorded in this area, the difference in the data length is accumulated, so that the unrecorded area increases.
[0063]
Also, as before, spiral T ₁ ~ T _i And spiral T _{i + 1} ~ T _2i Even if padding data is added in order to make the data lengths equal, the unrecorded area as dummy data increases in the same manner.
[0064]
Therefore, in the moving image recording method of the present embodiment, in the next GOP (2), the data to be recorded is replaced and the spiral T ₁ ~ T _i B picture and P picture are recorded in the spiral T _{i + 1} ~ T _2i An I picture is recorded. Thereby, the difference in the total data length can be reduced.
[0065]
Further, in the present embodiment, the control bit X (1) indicating whether or not the data is exchanged when moving from GOP (1) to GOP (2) is set, for example, after the data in the I picture of GOP (1). It is added and recorded. The control bit X (1) does not necessarily need to be added later, and can be added and recorded before the I picture of GOP (2).
[0066]
Next, in GOP (3), it is assumed that the data length of the I picture is shorter than the combined data length of the B picture and the P picture. This is because the complexity of the image changes for each GOP, and the compression rate changes accordingly.
[0067]
In this case, spiral T ₁ ~ T _i B picture and P picture are recorded in the spiral T _{i + 1} ~ T _2i An I picture is recorded. Similarly, the control bit X (2) is added and recorded after the data of the I picture of GOP (2).
[0068]
As described above, in the moving image recording method of the present embodiment, the I picture and the P / B picture are recorded while being switched to i spirals or other i spirals.
[0069]
As a result, even if there is a difference between the data length of the I picture and the combined data length of the P picture and the B picture due to the change in the compression rate, the amount of integration can be reduced, and no padding data is required. Use efficiency can be increased.
[0070]
As a result, it is possible to provide an optical disc 5 that efficiently records moving image data with a variable compression ratio, and a moving image reproducing apparatus that specially reproduces moving images from the optical disc 5.
[0071]
Here, k shown in FIG. 1 indicates the number of GOPs in a series of video sequences. As will be described later, the data length of the I picture is, for example, 100 Kbytes, but the control bit X (1) Is only 1 byte. Therefore, the increase in capacity due to the addition of control bits can be ignored.
[0072]
In the above example, the control bit X (k) is added before or after the data of each I picture. However, the present invention is not limited to this. For example, the control bit X (k) can be added only when the spiral is switched. This also makes it possible to determine whether or not replacement has been performed during reproduction.
[0073]
Furthermore, instead of the control bit X (k), spiral replacement information can be recorded in a TOC (Table Of Contents) in advance, and the replacement information can be restored to the original during reproduction. However, in this case, it is necessary to read in advance the replacement information of all video sequences and store it in a buffer memory (not shown). On the other hand, in the case of the control bit X (k), it is not necessary to read in advance, and it is only necessary to perform detection in the process of restoring the replacement at the time of reproduction. For this reason, since the buffer memory is not required, the replacement process can be easily performed.
[0074]
By the way, in the above example, the recording method for reducing the unrecorded area in the case where the difference between the data length of the I picture and the data length of the combined P picture and B picture changes due to the change of the compression rate for each GOP. Said. However, in some cases, the difference between the data length of the I picture and the data length of the combined P picture and B picture may be fixed.
[0075]
For example, as shown in FIG. 3, when the transfer rate of moving image data, that is, the code amount of one frame is 6 Mbps, the data length of I picture is 100 KB, the total data length of P picture is 37.5 KB in one GOP, and Assume that the total data length of the B picture is 12.5 KB. At this time, the ratio between the data length of the I picture and the combined data length of the P picture and the B picture is fixed at 100 KB: 50 KB = 2: 1.
[0076]
In such a case, as shown in FIG. 4, for example, in GOP (1), spiral T ₁ And spiral T ₂ I picture I (1) is recorded in two spirals of _Three And spiral T _Four B picture B (1) and P picture P (1) are recorded in these two spirals. In the next GOP (2), conversely, spiral T ₁ And spiral T ₂ B picture B (2) and P picture P (2) are recorded in two spirals of _Three And spiral T _Four I picture I (2) is recorded in these two spirals. Furthermore, in GOP (3), the spiral T ₁ And spiral T ₂ I picture I (3) is recorded in the two spirals of the spiral T _Three And spiral T _Four B picture B (3) and P picture P (3) are recorded in these two spirals.
[0077]
By repeating this in sequence, even if the compression rate is fixed and the data length of the I picture is different from the combined data length of the P picture and B picture, the padding is performed by sequentially switching the tracks. Data becomes unnecessary, and the recording capacity of the optical disk 5 can be used effectively. In addition, since replacement is always performed for each GOP, it is not necessary to add the control bit X (k) in this case.
[0078]
Next, a specific moving image recording method described above will be described based on the flowchart shown in FIG. For convenience of explanation, four spirals T ₁ ~ T _Four A case where recording is performed will be described.
[0079]
First, as shown in FIG. 5, for example, a television image such as NTSC (National Television System Committee) is taken in, A / D conversion is performed, and an analog moving image is converted into digital data (S1). Next, the digitized moving image is decomposed into one IOP, P picture, and B picture with respect to one GOP (k) by the MPEG algorithm and is compressed (S2). Then spiral T ₁ And spiral T ₂ Integrated amount S of data already recorded in ₁ And spiral T _Three And spiral T _Four Integrated amount S of data already recorded in ₂ Are compared (S3).
[0080]
S3, S ₁ ≦ S ₂ If so, the data length L1 of the I picture of the GOP (k) compressed with the moving image is compared with the data length L2 of the B picture and the P picture (S4). Note that when GOP (1) is recorded, the initial value is S. ₁ = S ₂ = 0.
[0081]
S4, L ₁ ≧ L ₂ If so, IOP data of GOP (k) is spiral T ₁ And spiral T ₂ The control bit X (k) indicating that recording is performed in the two spirals is added to the IOP data of GOP (k-1) and recorded (S5). As described above, the control bit X (k) is not necessary when the compression rate is fixed.
[0082]
Next, the I picture of GOP (k) is changed to spiral T ₁ And spiral T ₂ And record B / P picture in spiral T _Three And spiral T _Four (S6). Then, it is determined whether or not GOP (k) is the end of the video sequence that is the entire moving image (S7). If it is not the end of the moving image, the process returns to (S2), and the next GOP (k + 1) is processed.
[0083]
On the other hand, L at S4 ₁ <L ₂ If so, IOP data of GOP (k) is spiral T _Three And spiral T _Four A control bit X (k) indicating that recording is performed in the two spirals is added to the back of the data of the I picture of GOP (k−1) and recorded (S9). Again, the control bit X (k) is not necessary when the compression ratio is fixed as described above.
[0084]
Furthermore, the I picture of GOP (k) is changed to spiral T _Three And spiral T _Four And record B / P picture in spiral T ₁ And spiral T ₂ (S10). Next, the process proceeds to S7, where it is determined whether or not GOP (k) is the end of the video sequence that is the entire moving image. If it is not the end of the moving image, the process returns to S2 to perform the next GOP (k + 1) processing .
[0085]
In S3, if S1> S2, the data length L1 of the I picture of the GOP (k) compressed with the moving image is compared with the data length L2 of the B picture and the P picture, as in S4. (S8). Here again, when recording GOP (1), S ₁ = S ₂ = 0.
[0086]
S8, L ₁ ≧ L ₂ If so, the process proceeds to S9, where the data of the I picture of GOP (k) is spiral T _Three And spiral T _Four The control bit X (k) indicating that recording is performed in the two spirals is added to the IOP data of GOP (k−1) and recorded. Again, the control bit X (k) is not necessary when the compression ratio is fixed as described above.
[0087]
Next, the process proceeds to S10, and the I picture of GOP (k) is changed to spiral T. _Three And spiral T _Four And record B / P picture in spiral T ₁ And spiral T ₂ To record. Then, the process proceeds to S7, where it is determined whether or not GOP (k) is the end of the video sequence that is the entire moving image. If it is not the end of the moving image, the process returns to S2 to perform the next GOP (k + 1) processing .
[0088]
In S8, L ₁ <L ₂ If so, the process moves to S5, and the I picture data of GOP (k) is spiral T ₁ And spiral T ₂ The control bit X (k) indicating that recording is performed on the two spirals is added to the IOP data of GOP (k−1) and recorded. Next, the process proceeds to S6, and the I picture of GOP (k) is changed to spiral T. ₁ And spiral T ₂ And record B / P picture in spiral T _Three And spiral T _Four To record.
[0089]
Next, the process proceeds to S7, where it is determined whether or not GOP (k) is the end of the video sequence that is the entire moving image. If it is not the end of the moving image, the process returns to S2 to perform the next GOP (k + 1) processing .
[0090]
By recording a moving image by the method as described above, each spiral T of the optical disk 5 is recorded. ₁ ~ T _2i Thus, moving image data can be recorded continuously, and an unrecorded area such as padding data is not added, so that the utilization efficiency of the optical disk 5 can be improved.
[0091]
In addition, it is possible to determine in which spiral the I picture of the next GOP is recorded by simply adding a simple control bit X (k). ), The video can be played back by rearranging in the correct order. Further, special reproduction can be performed by sequentially connecting only I pictures based on the control bit (k).
[0092]
Next, a moving picture recording apparatus for recording a moving picture by the above recording method and a moving picture reproducing apparatus capable of performing normal reproduction and special reproduction will be described. In this embodiment, for convenience of explanation, in order to make the moving picture recording apparatus and the moving picture reproducing apparatus common, the explanation will be made based on the moving picture recording / reproducing apparatus configured in the same apparatus. However, the present invention is not necessarily limited to this, and the moving image recording device and the moving image reproduction device can be configured separately.
[0093]
As shown in FIG. 6, the moving picture recording / reproducing apparatus of the present embodiment is roughly divided into a disk drive system, a recording system, and a reproducing system, and these are controlled by the controller 1.
[0094]
The disk drive system includes a servo control circuit 11 and a spindle motor 12, and can drive the optical disk 5.
[0095]
The recording system includes a seek control circuit 4, an optical head feed motor 6 and an optical head 7, a recording circuit 21, a data modulation circuit 22, an error correction encoding circuit 23, a GOP dividing circuit 24, and a moving image encoding circuit 25. is doing.
[0096]
The reproduction system includes a reproduction signal processing circuit 31, a data demodulation circuit 32, an error detection and correction circuit 33, a GOP rearrangement circuit 34 as a continuous information rearrangement means, an I picture selection circuit 35 as a selection means, and a moving picture decoding circuit. 36, a monitor 37, and the like.
[0097]
Further, in order to control these, the controller 1 is provided, and a panel button 3 for inputting an instruction for recording / reproducing / fast-forwarding is provided. Recording / reproducing / fast-forwarding, etc. from the panel button 3 is provided. The instruction input signal is transmitted to the controller 1 via the panel control circuit 2.
[0098]
Therefore, the controller 1, the panel control circuit 2, the panel button 3, the recording system, and the disk drive system function as recording means, and the controller 1, the panel control circuit 2, the panel button 3, the reproduction system, and the disk drive system serve as reproduction means. It is supposed to fulfill the function of. The data demodulating circuit 32 functions as control bit detecting means.
[0099]
An operation at the time of recording a moving image on the optical disc 5 in the moving image recording / reproducing apparatus having the above configuration will be described with reference to FIG.
First, the controller 1 controls each function in the block according to a control procedure stored therein. The panel control circuit 2 converts an input signal 101 from the panel button 3 such as recording / playback / stop / fast-forward to an address port that can be recognized by the controller 1 and sends a panel command 102.
[0100]
Next, the controller 1 commands a seek control signal 103 to the seek control circuit 4 by inputting the panel command 102. Therefore, when a recording command is issued from the panel button 3, the seek control circuit 4 issues a seek command 104 to control the optical head feed motor 6 and the optical head 7 based on the seek control signal 103. The target spiral T of the optical disk 5 ₁ ~ T _Four Position it.
[0101]
The controller 1 also sends a servo control signal 107 to the servo control circuit 11 to control the spindle motor 12 for rotating the optical disc 5 through the motor signal 108. In this way, the target spiral T ₁ ~ T _Four The optical head 7 positioned at is shifted to the tracking state.
[0102]
Next, the moving image encoding circuit 25 performs A / D conversion on a video signal such as NTSC in accordance with the encoding command 114 sent from the controller 1 and compresses the moving image based on MPEG, so that an I picture and a B picture for each GOP. And each data of the P picture is output to the GOP dividing circuit 24.
[0103]
The GOP dividing circuit 24 divides one GOP into an I picture, a B picture, and a P picture to generate a signal i ₁ ~ I _Four Assign to and output.
[0104]
The spiral T to be recorded together with the above division result ₁ ~ T _Four A control bit X (k) indicating is also output.
[0105]
Next, the error correction encoding circuit 23 receives the signal i. ₁ ~ I _Four , And an error correction code is added to each of them, and four modulated data 116 are sent to the data modulation circuit 22. In response to the start command 115 from the controller 1, the data modulation circuit 22 sends out four modulation data 117 while adjusting the recording timing to the target address on the optical disk 5.
[0106]
Next, the recording circuit 21 inputs this modulation data 117 and sends the respective recording signals 118 to the four semiconductor lasers in the optical head 7 and the four spiral T ₁ ~ T _Four Signal i ₁ ~ I _Four At the same time. As a result, for example, when the ratio of the data length of an I picture to the data length of a B picture and a P picture is 2: 1, moving image data can be efficiently recorded on the optical disc 5 without adding padding data. it can.
[0107]
Next, the operation during playback of a moving image will be described with reference to FIG.
First, when a playback command is issued from the panel button 3, the seek control circuit 4 controls the seek command 104 to control the optical head feed motor 6 and the optical head 7 based on the seek control signal 103. And the target spiral T of the optical disk 5 ₁ ~ T _Four Position it. The controller 1 also sends a servo control signal 107 to the servo control circuit 11 to control the spindle motor 12 for rotating the optical disc 5 through the motor signal 108.
[0108]
Target spiral T ₁ ~ T _Four The optical head 7 positioned at is shifted to the tracking state, and the four spirals T ₁ ~ T _Four The moving image data recorded on the optical head 7 is converted into an electric signal by a photodetector (not shown) in the optical head 7, and each read signal 112 is sent to the reproduction signal processing circuit 31. The reproduction signal processing circuit 31 converts this signal into a binarized reproduction signal 109.
[0109]
Next, the controller 1 sends an activation signal 110 to the data demodulation circuit 32 and instructs the error detection and correction circuit 33 to output the demodulated demodulation signal 111 while adjusting the reproduction timing from the target address. . The error detection / correction circuit 33 receives the demodulated signal 111 and performs ECC processing to detect and correct a data error. ₁ ~ J _Four Is sent to the GOP rearrangement circuit 34 and the I picture selection circuit 35.
[0110]
The GOP rearrangement circuit 34 determines that the I picture data is spiral T ₁ ・ T ₂ Or spiral T _Three ・ T _Four Four reproduction data j based on the control bit X (k) indicating whether or not ₁ ~ J _Four Rearrange the GOPs contained in the correct order.
Further, the I picture selection circuit 35 sequentially concatenates only the I pictures based on the control bit X (k).
[0111]
Next, the moving picture decoding circuit 36 decompresses the rearranged GOP data or the connected I-picture data through the decoding control signal 113 with the controller 1, and performs D / A conversion to video such as NTSC. At the same time, the controller 1 performs control so that the moving image can be smoothly displayed on the monitor 37 without interruption while exchanging control of transfer start and transfer waiting with the controller 1. It is assumed that the moving picture decoding circuit 36 has a minimum necessary buffer memory.
[0112]
As described above, normal playback and high-speed special playback of moving images can be performed from the optical disc 5 on which moving image data in which the data length of the I picture differs from the data length of the B and P pictures is recorded. Further, since the optical head 7 can be disposed only on one side of the optical disc 5, the apparatus can be thinned. Furthermore, since it is no longer necessary to store padding data, the capacity of the buffer memory can be reduced, and the memory can be used effectively.
[0113]
Next, normal playback and special playback control procedures in the moving picture playback apparatus will be described with reference to the flowcharts of FIGS. First, normal reproduction will be described.
[0114]
As shown in FIG. 7, first, the TOC recorded to indicate the position of the moving image on the optical disk 5 is read, and the optical head 7 is accessed to the head GOP of a series of video sequences (S11).
[0115]
Next, in order to execute the normal reproduction operation instructed from the panel button 3, the four beams irradiated from the optical head 7 are converted into the spiral T of the optical disk 5. ₁ ~ T _Four The recorded I picture data and B / P picture data are reproduced (S12).
[0116]
Next, based on the control bit X (k), the I picture, the B picture, and the P picture included in the four data are rearranged in the correct GOP order (S13). Then, the rearranged GOP data is decompressed (S14), and an image such as NTSC is output.
Next, after confirming the end of the GOP (S15), if it is not the end of a series of video sequences, the process returns to S12 and continues.
[0117]
The above is the normal reproduction process. Next, the case of special reproduction processing will be described. It is assumed that the optical head 7 is positioned in the radial direction at the beginning of the I picture at a certain point in time as in the normal reproduction process.
[0118]
As shown in FIG. 8, in order to execute a special reproduction operation such as fast-forwarding instructed from the panel button 3, the four beams irradiated from the optical head 7 are irradiated with the spiral T of the optical disk 5. ₁ ~ T _Four The recorded I picture data and B / P picture data are reproduced (S21).
[0119]
Next, only I pictures are sequentially connected based on the control bit X (k) (S22). Here, it is assumed that data rearrangement of the remaining B picture and P picture is not performed.
[0120]
Next, the data of the concatenated I picture is decompressed and an image such as NTSC is output (S23).
[0121]
Until the optical head 7 determines the end of a series of video sequences (S24), the process returns to S21 and continues.
[0122]
High-speed special reproduction that does not require unnecessary access such as track jumping can be performed according to the processing procedure described above.
[0123]
In the above example, four spirals T ₁ ~ T _Four The multi-spiral optical disk 5 having the above-mentioned is illustrated. However, for an optical disk having a large number of concentric tracks, if the above-mentioned recording or reproduction is performed by grouping tracks into four groups, A recording method and a moving image reproducing apparatus can be obtained.
[0124]
In the above embodiment, an example in which compressed data of a moving image is recorded has been described. However, the present invention is not limited to this. When continuous data such as audio information is divided and recorded, the data is evenly divided depending on how the division is divided. This is also effective when division is not possible.
[0125]
Thus, in the continuous information recording method of the present embodiment, continuous digital information is divided into first information and second information, and a spiral T composed of i recording tracks. ₁ ~ T _i And a spiral T consisting of i other recording tracks _{i + 1} ~ T _2i In addition, the first information and the second information are recorded while being connected to each other while being exchanged.
[0126]
That is, the divided first information and second information in one continuous digital information is a spiral T ₁ ~ T _i And spiral T _{i + 1} ~ T _2i Are recorded simultaneously without duplication.
[0127]
Each time one piece of digital information is recorded, the spiral T ₁ ~ T _i Accumulated data volume and spiral T _{i + 1} ~ T _2i Are compared with the accumulated recording data amount. In addition, based on the comparison result, the divided first information and second information in the next continuous digital information is the spiral T ₁ ~ T _i Accumulated data volume and spiral T _{i + 1} ~ T _2i Are replaced so that the difference from the accumulated recording data amount becomes smaller.
[0128]
As a result, spiral T ₁ ~ T _i Accumulated data volume and spiral T _{i + 1} ~ T _2i The accumulated recording data amount can be recorded while being controlled to be substantially equal.
[0129]
Therefore, even when one continuous digital information is reproduced, the first information and the second information can be reproduced at the same time, and can be restored to the original continuous digital information by immediately rearranging. . Further, when one piece of continuous digital information is divided as in the prior art, dummy data is not added to make the data length uniform.
[0130]
As a result, it is possible to provide a continuous information recording method such as moving image information and audio information that can effectively use the recording area of the optical disc 5 without adding an unrecorded area.
[0131]
In addition, in the moving picture recording method of the present embodiment, in particular, I picture data in GOP, and data obtained by combining P picture data and B picture data are spiral T ₁ ・ T ₂ And spiral T _Three ・ T _Four It is recorded continuously while being replaced. In addition, when replacing, spiral T for each GOP _Three ・ T _Four Accumulated data volume and spiral T _Three ・ T _Four Are replaced so that the difference from the accumulated recording data amount becomes smaller.
[0132]
As a result, spiral T ₁ ・ T ₂ Accumulated data volume and spiral T _Three ・ T _Four The accumulated recording data amount can be recorded while being controlled to be substantially equal.
[0133]
Therefore, when recording compressed moving image data based on the MPEG algorithm, the compression rate differs for each GOP, and therefore the difference between the data amount of the I picture and the data amount of the P picture data and the B picture data is constantly increased. Even in the case of a change, the recording area of the optical disc 5 can be used effectively without adding an unrecorded area.
[0134]
Furthermore, in the moving image recording method of the present embodiment, the spiral T ₁ ・ T ₂ And spiral T _Three ・ T _Four It is possible to easily rearrange the I picture, the P picture, and the B picture recorded while being replaced with each other into the original GOP configuration based on the control bit X. Normal playback of data can be performed.
[0135]
Further, by selecting and connecting only I picture data based on the control bit X, special reproduction such as fast-forward, reverse-feed, and halfway reproduction can be easily performed.
[0136]
The control bit X is recorded either before or after the data of the I picture, so that the I picture can be extracted. Further, since this control bit X can normally be composed of one bit, it is small enough to be ignored with respect to the data amount of the GOP, and thus has no effect.
[0137]
Therefore, it is possible to provide a moving image recording method capable of effectively utilizing the recording area of the optical disc 5 while ensuring the special reproduction function as well as the normal reproduction for the compressed moving image data based on the MPEG algorithm.
[0138]
In the continuous information reproducing apparatus of the present embodiment, continuous digital information is divided into first information and second information, and a spiral T composed of i recording tracks. ₁ ~ T _i And a spiral T consisting of i other recording tracks _{i + 1} ~ T _2i In addition, when reproducing the optical disc 5 in which the first information and the second information are continuously recorded, the optical disc 5 is irradiated with at least 2 × i light beams by the reproducing means. A read signal including information and second information is obtained.
[0139]
Next, the GOP rearrangement circuit 34 replaces the first information and the second information from the read signal to return to the original continuous digital information and reproduces it.
[0140]
As a result, spiral T ₁ ~ T _i And spiral T _{i + 1} ~ T _2i The first information and the second information can be reproduced at the same time while controlling the switching of the recording, and the information can be immediately replaced and restored.
[0141]
Accordingly, the continuous digital information is divided into the first information and the second information in order to effectively use the recording area, and the spiral T ₁ ~ T _i And spiral T _{i + 1} ~ T _2i It is possible to reproduce the optical disk 5 recorded in a row while being replaced with each other at a high speed.
[0142]
In addition, in the moving picture reproducing apparatus of the present embodiment, in particular, the GOP is divided into I picture data and P picture and B picture combined data, and a spiral T composed of two recording tracks. ₁ ・ T ₂ And a spiral T consisting of two other recording tracks _Three ・ T _Four In addition, when reproducing the optical disk 5 recorded in a row while being switched, the reproduction means such as the seek control circuit 4 or the reproduction signal processing circuit 31 combines the I picture data with the P picture and the B picture. A read signal including the read data is obtained.
[0143]
Next, the GOP rearrangement circuit 34 replaces the I picture and the combined data of the P picture and the B picture from the read signal and returns to the original GOP for reproduction.
[0144]
As a result, since the compression rate is different for each GOP when recording the compressed moving image data based on the MPEG algorithm, the difference between the data amount of I picture and the data amount of P picture data and B picture data is constantly changed. Even when it changes, it can be easily reproduced.
[0145]
Here, in this embodiment, the I picture selection circuit 35 for selecting and connecting only the data of the I picture from the read signal of the reproducing means is provided, and the moving picture is output by the output of the I picture selection circuit 35. Normal playback is performed. Further, special reproduction such as fast-forward, reverse-feed and halfway reproduction is performed by the output of the I picture selection circuit 35.
[0146]
Therefore, it is possible to provide a moving image reproducing apparatus that does not require a dummy data deleting operation that is conventionally required for normal reproduction of moving images.
[0147]
Further, it is possible to perform special reproduction by selecting and connecting only the read I picture data, and therefore a moving image reproduction apparatus capable of performing special reproduction of a moving image without an access operation such as an unnecessary jump is provided. Is possible.
[0148]
Further, in the video playback device of the present embodiment, the spiral T ₁ ・ T ₂ And spiral T _Three ・ T _Four It is possible to easily rearrange the I picture, the P picture, and the B picture that are recorded while being replaced with each other into the original GOP configuration based on the control bit X. Accordingly, it is possible to provide a moving image reproducing apparatus capable of performing normal reproduction of compressed moving image data based on the MPEG algorithm.
[0149]
Further, it is possible to provide a moving image reproducing apparatus that can easily perform special reproduction of moving images such as fast-forward, reverse-feed, and intermediate reproduction by selecting only I-picture data based on the control bit X and connecting them. Can do.
[0150]
[Embodiment 2]
The following will describe another embodiment of the present invention with reference to FIG. For convenience of explanation, members having the same functions as those shown in the drawings of the first embodiment are given the same reference numerals and explanation thereof is omitted.
[0151]
In the first embodiment, I picture data, B picture data, and P picture data are recorded in a plurality of tracks. However, the present invention is not limited to this. For example, the data is divided into a plurality of recording layers. Even if recorded, the same effect can be obtained.
[0152]
That is, as shown in FIG. 9, the optical disc 50 used in the moving image recording method and the moving image reproducing apparatus of this embodiment has two recording layers 56 to 59 in total on the front surface and the back surface, respectively. ing.
[0153]
Specifically, the optical disk 50 is formed by bonding two substrates 51 and 52 with the reflective layers 53 and 54 and the adhesive layer 55 sandwiched therebetween. The base 51 has two recording layers 56 and 57, and the base 52 has two recording layers 58 and 59, whereby moving image data is recorded in a total of four layers. . The respective recording layers 56 to 59 reproduce data by the light beams 61 to 64 condensed and tracked by the objective lenses 71 to 74 in the optical head 7 (not shown) disposed above and below the optical disc 50. Is called.
[0154]
The I picture data and the B picture and P picture data are converted into the spiral T described in the first embodiment. ₁ ~ T _Four Instead, by assigning and recording to the recording layers 56 to 59, four times the moving image data can be recorded on one optical disk 50, and special reproduction can be performed in the same manner.
[0155]
As described above, in the continuous information recording method of the present embodiment, the data of the I picture in the GOP and the data obtained by combining the data of the P picture and the data of the B picture are recorded in the recording layers 56 57 and the recording layers 58. It is recorded continuously while being replaced with 59.
[0156]
Further, when switching, the GOP is switched so that the difference between the accumulated recording data amount of the recording layers 56 and 57 and the accumulated recording data amount of the recording layers 58 and 59 becomes small.
[0157]
As a result, recording can be performed while controlling the integrated recording data amount of the recording layers 56 and 57 and the integrated recording data amount of the recording layers 58 and 59 to be substantially equal.
[0158]
Therefore, when recording compressed moving image data based on the MPEG algorithm, the compression rate differs for each GOP, and therefore the difference between the data amount of the I picture and the data amount of the P picture data and the B picture data is constantly increased. Even in the case of change, the recording areas of the recording layers 56 to 59 in the optical disc 5 can be effectively used without adding an unrecorded area.
[0159]
As for other effects, the spiral T in the first embodiment including the reproducing apparatus is used. ₁ ~ T _Four Is the same as that in which recording layers 56 to 59 are replaced, and a description thereof is omitted.
[0160]
【The invention's effect】
In the continuous information recording method according to the first aspect of the present invention, as described above, the continuous digital information is divided into first information and second information, and the i-th recording track or i-th recording layer is used. The first information and the second information are continuously recorded while being exchanged on one recording band and another i recording tracks or a second recording band made up of i recording layers. This is a method of replacing each digital information so that the difference between the integrated recording data amount of the first recording band and the integrated recording data amount of the second recording band becomes small.
[0161]
Therefore, recording can be performed while controlling the integrated recording data amount of the first recording band and the integrated recording data amount of the second recording band to be substantially equal.
[0162]
Therefore, even when one continuous digital information is reproduced, the first information and the second information can be reproduced at the same time, and can be restored to the original continuous digital information by immediately rearranging. . Further, when one piece of continuous digital information is divided as in the prior art, dummy data is not added to make the data length uniform.
[0163]
As a result, there is an effect that it is possible to provide a continuous information recording method that can effectively use the recording area of the optical recording medium without adding an unrecorded area.
[0164]
As described above, the continuous information recording method according to the second aspect of the present invention is the continuous information recording method according to the first aspect, wherein the continuous digital information is a GOP which is a basic unit of digitally compressed moving image data. The first information is GOP intra-frame encoded image data, and the second information is GOP unidirectional inter-frame predictive encoded image data and bi-directional inter-frame predictive encoded image data. This is a method of combining data.
[0165]
Therefore, when recording compressed moving image data based on the MPEG algorithm, the compression rate differs for each GOP. Therefore, the amount of intra-frame encoded image data and the data between one-way inter-frame predictive encoded image and bi-directional frames are recorded. Even in the case where the difference in the amount of data combined with the data of the predictive encoded image constantly changes, the recording area of the optical recording medium can be effectively used without adding an unrecorded area.
[0166]
As described above, the continuous information recording method according to claim 3 is the continuous information recording method according to claim 2, wherein the data of the intra-frame encoded image is either the first recording band or the second recording band. In this method, a control bit indicating whether or not the data has been recorded is recorded before or after the data of the intra-frame coded image.
[0167]
Therefore, it is possible to provide a continuous information recording method capable of effectively utilizing the recording area of the optical recording medium while ensuring the special reproduction function as well as the normal reproduction for the compressed moving image data based on the MPEG algorithm. There is an effect.
[0168]
As described above, the continuous information reproducing apparatus of the invention according to claim 4 reproduces a plurality of continuous digital information by irradiating a plurality of light beams onto a plurality of recording tracks or recording layers of an optical recording medium. In the reproducing apparatus, the continuous digital information is divided into first information and second information, and a first recording band consisting of i recording tracks or i recording layers and other i recording tracks or i sheets. In order to reproduce an optical recording medium recorded in succession while exchanging the first information and the second information with a second recording band consisting of a plurality of recording layers, at least 2 × i light beams are emitted from the optical recording medium. And reproducing means for obtaining a readout signal including the first information and the second information, and replacing the first information and the second information from the readout signals of the reproduction means to obtain the original continuous digital In which and a continuous information rearranging means to play back the information.
[0169]
Therefore, with respect to continuous digital information, light that is recorded continuously while being divided into the first information band and the second information band and being replaced with the first recording band and the second recording band, respectively, in order to effectively use the recording area. There is an effect that the recording medium can be reproduced at high speed.
[0170]
As described above, the continuous information reproducing apparatus according to claim 5 is the continuous information reproducing apparatus according to claim 4, wherein the continuous digital information is a GOP which is a basic unit of digitally compressed moving image data. The first information is GOP intra-frame encoded image data, and the second information is GOP unidirectional inter-frame predictive encoded image data and bi-directional inter-frame predictive encoded image data. On the other hand, there is a selecting means for selecting and connecting only the data of the intra-frame encoded image from the readout signal of the reproducing means, and the normal reproduction of the moving image is performed by the output of the continuous information rearranging means. On the other hand, special reproduction such as fast forward, reverse feed and intermediate reproduction is performed by the output of the selecting means.
[0171]
Therefore, when recording compressed moving image data based on the MPEG algorithm, the compression rate differs for each GOP. Therefore, the data amount of the intra-frame encoded image, the data of the unidirectional inter-frame predictive encoded image, and the bi-directional inter-frame prediction Even when the difference from the data amount of the encoded image data constantly changes, it can be easily reproduced.
[0172]
In the present invention, there is a selection means for selecting and connecting only the data of the intra-frame encoded image from the readout signal of the reproduction means, and the normal reproduction of the moving image is performed by the output of the continuous information rearrangement means. Is done. Further, special reproduction such as fast forward, reverse feed and intermediate reproduction is performed by the output of the sorting means.
[0173]
Therefore, there is an effect that it is possible to provide a continuous information reproducing apparatus that does not require a dummy data deleting operation that has been necessary in the conventional reproduction of a moving image.
[0174]
Furthermore, since the special reproduction can be performed by selecting and connecting only the data of the read intra-frame encoded image, the continuous information reproduction apparatus capable of performing the special reproduction of the moving image without an access operation such as an unnecessary jump. It is possible to provide an effect.
[0175]
As described above, the continuous information reproducing apparatus according to claim 6 is the continuous information reproducing apparatus according to claim 5, wherein the data of the intra-frame encoded image is either the first recording band or the second recording band. Control bit detecting means for detecting the control bit from the read signal of the reproducing means for reproducing the optical recording medium having recorded the control bit indicating whether the control bit is recorded on the control bit. Based on the above, the data of the intra-frame encoded image, the data of the unidirectional inter-frame predictive encoded image and the data of the bi-directional inter-frame predictive encoded image are replaced and returned to the original GOP. While performing normal reproduction, only the data of the intra-frame coded image is selected and connected based on the control bits of the control bit detection means. It is intended to make more special playback.
[0176]
Therefore, based on the control bits, the intra-frame encoded image recorded while being switched between the first recording band and the second recording band, the unidirectional inter-frame predictive encoded image, and the bidirectional inter-frame predictive encoded image are based on the control bits. Thus, it is possible to easily rearrange the original GOP configuration, thereby providing an effect of providing a continuous information reproducing apparatus capable of performing normal reproduction of compressed moving image data based on the MPEG algorithm.
[0177]
In addition, a continuous information reproducing apparatus that can easily perform special reproduction of moving images such as fast-forward, reverse-feed, and intermediate reproduction by selecting and connecting only intra-frame encoded image data based on control bits. There is an effect that it can be provided.
[Brief description of the drawings]
FIG. 1 shows an embodiment of the present invention, and is a configuration diagram of a recording data area of an optical disc recorded by the moving image recording method.
FIG. 2 is a picture configuration diagram of a GOP in MPEG to which the above moving image recording method is applied.
FIG. 3 is an explanatory diagram showing a code amount of each picture in the GOP.
FIG. 4 is a schematic configuration diagram showing a recording data area of another optical disc of the present invention.
FIG. 5 is a flowchart showing a procedure for recording a moving image on an optical disc by the moving image recording method described above.
FIG. 6 is a block diagram showing a moving image recording / reproducing apparatus for reproducing an optical disc recorded by the moving image recording method.
FIG. 7 is a flowchart showing a reproduction procedure when an optical disk recorded by the moving image recording method is normally reproduced by the moving image recording / reproducing apparatus.
FIG. 8 is a flowchart showing a reproduction procedure when special reproduction is performed on the optical disk recorded by the moving image recording method using the moving image recording / reproducing apparatus.
FIG. 9 shows another embodiment of the present invention and is an explanatory view showing an optical disc recorded on a recording layer.
FIG. 10 is an explanatory diagram showing a configuration of a GOP recorded by a conventional moving image recording method.
[Explanation of symbols]
1 Controller
5 Optical disc (optical recording medium)
32 Data demodulation circuit (control bit detection means)
34 GOP rearrangement circuit (continuous information rearrangement means)
35 I picture selection circuit (selection means)
X control bit
T ₁ ・ T ₂ Spiral (first recording band)
T _Three ・ T _Four Spiral (second recording band)

Claims (6)

In a continuous information recording method for recording a plurality of continuous digital information on an optical recording medium,
The continuous digital information is divided into first information and second information, from a first recording band consisting of i recording tracks or i recording layers and another i recording tracks or i recording layers. On the other hand, the first information and the second information are exchanged and recorded on the second recording band.
The continuous information recording method, wherein the replacement is performed so that the difference between the integrated recording data amount of the first recording band and the integrated recording data amount of the second recording band is reduced for each continuous digital information. The continuous digital information is a GOP which is a basic unit of digitally compressed moving image data, the first information is data of an intra-frame encoded image of the GOP, and the second information is a unidirectional GOP. 2. The continuous information recording method according to claim 1, wherein the inter-frame predictive encoded image data and bi-directional inter-frame predictive encoded image data are combined. A control bit indicating whether the data of the intra-frame encoded image is recorded in the first recording band or the second recording band is recorded before or after the data of the intra-frame encoded image. The continuous information recording method according to claim 2. In a continuous information reproducing apparatus for reproducing a plurality of continuous digital information by irradiating a plurality of light beams onto a plurality of recording tracks or recording layers of an optical recording medium,
The continuous digital information is divided into first information and second information, from a first recording band consisting of i recording tracks or i recording layers and another i recording tracks or i recording layers. In order to reproduce an optical recording medium recorded in a row while switching the first information and the second information to the second recording band,
Reproducing means for irradiating the optical recording medium with at least 2 × i light beams to obtain a read signal including the first information and the second information;
Continuous information reproduction, comprising: continuous information rearrangement means for exchanging the first information and the second information from the read signal of the reproduction means to restore the original continuous digital information. apparatus. The continuous digital information is a GOP which is a basic unit of digitally compressed moving image data, the first information is data of an intra-frame encoded image of the GOP, and the second information is a unidirectional GOP. While the data of the inter-frame predictive encoded image and the data of the bi-directional inter-frame predictive encoded image,
A selection means for selecting and connecting only the data of the intra-frame encoded image from the readout signal of the reproduction means;
5. The continuous information reproducing apparatus according to claim 4, wherein normal reproduction of a moving image is performed by the output of the continuous information rearranging means, and special reproduction is performed by the output of the selecting means. In order to reproduce an optical recording medium on which a control bit indicating whether the data of the intra-frame coded image is recorded in the first recording band or the second recording band, the above-mentioned read-out signal of the reproducing means Control bit detection means for detecting the control bit,
Based on the control bits of the control bit detection means, the data of the intra-frame encoded image, the data of the unidirectional inter-frame predictive encoded image and the bidirectional inter-frame predictive encoded image data are combined. While performing normal playback by switching back to the original GOP,
6. The continuous information reproducing apparatus according to claim 5, wherein special reproduction is performed by selecting and connecting only the data of the intra-frame coded image based on the control bit of the control bit detecting means.

Images