JPH0438679A - Recording medium and reproducing device for recording medium - Google Patents

Abstract

PURPOSE:To display normal picture data at the time of special reproduction by recording a succeeding picture data address showing the position on the recording medium of the picture data to be reproduced next to the each picture data at the time of the special reproduction together with each picture data. CONSTITUTION:Plural sheets of the picture data 11 to be reproduced in regular order at the time of usual reproduction and the succeeding picture address 12 for every picture data are recorded on the recording medium 20. An address for fast forwarding reproduction, the address for reverse reproduction, and the address for fast rewinding reproduction, etc., are provided beforehand in the succeeding picture address 12. The contents of the succeeding picture address 12 are determined beforehand in such a way that, for instance, the address for the fast forwarding reproduction points at the next but one picture to the picture data itself belongs to, and the address for the fast rewinding reproduction points at the preceding but one picture and so on. Thus, plural picture data can continuously be recorded, and in addition, at the time of the special reproduction such as the fast forwarding reproduction, the reverse reproduction, and the fast rewinding reproduction, etc., the normal picture data free from the drop-out of data can be displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a recording medium for recording a plurality of image data, and a recording medium reproducing apparatus for reproducing the recording medium.

2. Description of the Related Art In recent years, compact discs (hereinafter referred to as CDs) and digital audio tapes (hereinafter referred to as DATs), which are described on pages 83 to 138 of "Illustrated Compact Disc Reader (Revised 2nd Edition)", have recently become popular. For example, recording media that continuously record audio data obtained by converting audio signals from analog to digital, and
Recording media reproducing devices such as compact disc players (hereinafter referred to as CD players) and DAT players described in pages 179 to 216 of "Illustrated Compact Disc Reader (Revised 2nd Edition)" have been commercialized. C
D is a disk-shaped recording medium, and digital audio data is recorded on a spiral track at a constant linear velocity starting from the innermost circumference. A CD player is a recording medium reproducing device that reads audio data from a CD using optical means, converts it into digital and analog data, and outputs the data.

In the above-mentioned CD player, when special playback such as fast-forward playback or fast-reverse playback is performed, a so-called track kick method is used, in which the track recorded on the CD is vertically traversed and data is skipped. For example, when performing fast-forward playback, the CD player performs several track kicks toward the outer circumference of the CD at a predetermined timing, reads audio data for a predetermined time, and then repeats the operation of kicking the track toward the outer circumference. this is,
This is because it is difficult to change the speed at which data is read from a CD, and because it is possible to understand the outline of the information conveyed by the audio data, even if the audio data is not necessarily continuous (without reading all the data). It is being done.

Furthermore, attempts have been made to record data other than audio data, such as image data, on CDs and DATs, which are conventional recording media for recording audio data. An example of recording data other than audio data on a CD is the Compact Disc Read Only Memory (hereinafter referred to as CD) described on pages 244 to 249 of the above-mentioned document.
It is called DROM. ).

An example of a method for recording image data on a CDROM will be described below with reference to FIGS. 5 and 6.

FIG. 5 is a format diagram of a block, which is the minimum unit of data access in a CDROM, and FIG. 6 is a diagram showing the structure of data recorded as user data on a CDROM disk.

In FIG. 5, 51 is a synchronization pattern, which is data having a specific pattern indicating the beginning of each block.

52 is a header, block address 521 (minute 52
11. Seconds 5212. block 5213) and 1-byte mode information 522. Here, minute 5211
．． Seconds 5212. Each block 5213 has a relationship of 1 minute = 60 seconds 1 second = 75 blocks. Mode information 522 indicates the structure of the block. 53 is user data, which has a capacity of 2048 bytes. The image data is recorded as user data 53. 54 is auxiliary data 7 - user data 53
It consists of error detection and correction codes.

In FIG. 6, 61 is image data, and 62 is an area where O is recorded (O area).

An example of a method for recording image data consisting of 4 bits per pixel, 400 pixels vertically, and 640 pixels horizontally on a CDROM disk will be described below.

The image data 61 is divided into 2048 bytes from the beginning. When a fraction is found, 0 is added after the image data 61 to make the data amount equal to 2048 bytes. The amount of image data 61 in this conventional example is 400x640x0.5=128000 [bytes], and dividing this by the capacity of one block of user data 53 yields 128000÷2048=62, with a remainder of 1024. For the fraction 1024, 1024 bytes of O, which is the difference from the user data 53, are added to the 0 area 62), making the data amount equal to 2048 bytes.

2048-1024=1024 As a result, one image data is divided into 63 pieces.

Next, for each divided image data, auxiliary data 5
4. A header 52 and synchronization pattern 51 are added. The block address 521 in the header 52 is the image data 6
Add consecutive items in order from the beginning of 1. for example,
If the address of the first block is 2 minutes, 0 seconds, 0 blocks, the address of the next block is 2 minutes, 0 seconds, 1 block,
The address of the last block will be 62 blocks of 2 minutes and 0 seconds.

By the above method, image data is divided into a plurality of plots, and then recorded on a CDROM disk.

Problems to be Solved by the Invention However, in a recording medium in which a plurality of image data are recorded using the above-described method, fast forwarding is performed by intermittently reproducing the data while performing a track kick at a predetermined timing by the recording medium reproducing device. When performing special playback such as playback or fast rewind playback, it is possible that one image's worth of image data may not be read out depending on the timing of the track kick, and a meaningless image, that is, an image with part of it missing, may be displayed on the screen. The problem was that there was.

In view of the above, the present invention provides a recording medium and a recording medium capable of continuously recording a plurality of image data and displaying normal image data during special playback such as fast-forward playback, reverse playback, and fast-reverse playback. The purpose is to provide a playback device.

Means for Solving the Problems The present invention provides fast forward playback, reverse playback,
A recording medium that records a next image address indicating the position on the recording medium of image data to be reproduced next to each image data during special playback such as fast rewind playback, and reading the image data and the next image address from this recording medium. reading means, and
a reproduction method specifying means for specifying a special reproduction method; a selection means for selecting the next image address of the image data to be reproduced next from among the read next image addresses according to the specified reproduction method; and selection by the selection means. The recording medium reproducing apparatus is provided with a readout control means for controlling the readout means to read out the image data pointed to by the next image address from the recording medium.

According to the above-described structure, the present invention records in advance the address of the image data to be reproduced next at each special reproduction as the next image address, and when the recording medium is reproduced, the reading means adds the next image data to each image data. The image address is read out, the reproduction method designation means specifies the reproduction method, the selection means selects the next image address that matches the designated reproduction method, and the readout control means controls the reading means to read the selected image data. By doing so, special playback is realized in units of image data.

Embodiment First, the outline of the present invention will be explained using FIGS. 1 and 2.

FIG. 1 is a conceptual diagram of a recording medium according to the present invention, and FIG. 2 is a conceptual diagram of a recording medium reproducing apparatus according to the present invention.

In FIG. 1, 11 is image data and 12 is a next image address. In FIG. 2, 20 is a recording medium;
The data shown in FIG. 1 is recorded.

Reference numeral 21 denotes data reading means, which reads the image data 11 and the next image address 12 from the recording medium 20.

Reference numeral 22 denotes an output means, which inputs the read image data 11, performs predetermined processing such as conversion into a video signal, and then outputs it to the outside. Reference numeral 23 denotes a reproduction method specifying means for instructing a special reproduction method. Reference numeral 24 denotes a selection means, which inputs the next image address 12 that has been read out and selects an address of the next image suitable for the selected reproduction method from among them. 25
is a readout control means, which controls the readout means 21 to read out the image data pointed to by the next image address selected by the selection means 24.

Hereinafter, the recording medium and the recording medium reproducing device will be explained in order.

Recorded on the recording medium 20 are a plurality of pieces of image data 11 that are sequentially reproduced during normal reproduction, and a next image address 12 for each piece of image data. In the next image address 12, addresses for fast forward playback, addresses for reverse playback, addresses for fast reverse playback, etc. are prepared in advance. The contents of the next image address 12 are predetermined, such as, for example, for fast-forward playback, it refers to the second image after the image data to which it belongs, and for fast-reverse playback, it refers to the two previous image data. ing.

A recording medium reproducing apparatus that reproduces the recording medium 20 on which such data is recorded will be described. First, reading means 2
1 reads the image data 11 and the next image address 12 from the recording medium 20, and outputs the image data 11 to the output means 22 and the next image address 12 to the selection means 24. The output means 22 performs processing on the input image data 11, such as arranging it on a display screen and converting it into a video signal, and outputs it to the outside. On the other hand, the reproduction method specifying means 23 receives input from the outside and specifies one reproduction method from among special reproductions such as fast-forward reproduction, reverse reproduction, and fast-reverse reproduction to the selection means 24. Upon receiving the instruction, the selection means 24 selects the reading means 2
From the next image addresses 12 inputted from 1, the next image address matching the instructed reproduction method is selected and sent to the readout control means 25. As mentioned above, in the next image address 12 recorded on the recording medium 20, the next image address for fast forward playback, fast backward playback, etc. is recorded. When instructed, the control means 2 reads out the next image address for fast-forward playback.
Output to 5. When the readout control means 25 receives the next image address, the readout control means 25 reads the image data 11 starting from this address.
The reading means 21 is controlled to read from the recording medium 20, and the reading means 21 follows instructions from the reading control means 25.
Data is read from the recording medium 20.

As a result, only the image data that you want to play during each special playback is played back in the desired order from a recording medium on which multiple pieces of image data have been recorded, so normal images with no data loss are generated during special playback. can be displayed.

Next, as a first embodiment of the present invention, a CDR is recorded on a recording medium.
A case where a CDROM player is used as a recording medium playback device for an OM disk will be explained using FIGS. 3 to 5.

FIG. 3 is a structural diagram of data recorded as user data 54 on the CDROM disc of this embodiment, FIG. 4 is a block diagram of the CDROM player of the same embodiment, and FIG. 5 is a block format diagram.

In FIG. 3, 61 is the image data described in the conventional example. 33 is the next image address, and 34 is an area where 0 is recorded (0 area) like 62. In this embodiment, two addresses are recorded as the next image address 33, one for fast-forward playback and one for fast-reverse playback.

In FIG. 4, 41 is a CDROM disk, which is a recording medium in this embodiment. A servo circuit 42 controls the spindle motor 43 and the pickup 44. A spindle motor 43 rotates the CDROM disk 41.

44 is a pickup, which picks up the CDRO by optical means.
Data is read from the M disk 41 and an analog electrical signal is output. A waveform shaping circuit 45 shapes the analog electrical signal output from the pickup 44 into a pulse signal. 46 is a digital signal processing circuit which inputs the pulse signal from the waveform shaping circuit 45, punches out data from the pulse signal, performs processing such as synchronization detection, error detection and correction, and converts the block address 521 shown in FIG. The user data 53 is output to the internal bus 47 to the read control means 483 in the processor 48 . 47 is an internal bus, which connects a digital signal processing circuit 46 and a microprocessor 48. This is a data path connecting the memory circuit 498 and the image processing output circuit 410.

48 is a microprocessor, which incorporates the following three means. The first means is a separation means 481 which has a counter function and separates the user data 53 output from the digital signal processing circuit 46 into image data 61 and the next image address 33, and the image address is sent to the image processing output circuit 41.
0 to the video memory 411, and the next image data to the memory circuit 49. The second means is a determining means 482, which refers to the next image address 33 stored in the memory circuit 49, and selects a switch circuit that is turned on among the fast-forward switch circuit 412 and the fast-back switch circuit 413. Next image address reading control means 48
It has the role of outputting to 3. The third means is a read control means 483, which controls the servo circuit 42 to access the data indicated by the next image address selected by the determination means 482. 49 is a memory circuit;
Next image address 33 transferred by separation means 481
Save up. Reference numeral 410 denotes an image processing output circuit, which stores the image data row 1 transferred by the separating means 481 in the video memory 411, converts the image data 61 stored in the video memory 411 into digital/analog, and outputs the converted image data to the outside. A video memory 411 stores image data 61. 412 is a fast forward switch circuit, which is linked to a fast forward button on the front panel of the CDROM player. 412 is a cluster switch circuit, which is linked to a shell button on the front panel of the CDROM player.

Here, the relationship between FIG. 2 and FIG. 4 will be explained.

In FIG. 4, a CDROM disk 41 is a recording medium 2.
0, the servo circuit 42. Spindle motor 43. Pickup 44. Waveform shaping circuit 45° digital signal processing circuit 462 separation means 481 is connected to readout means 21, image processing output circuit 410. The video memory 411 is connected to the output means 22 by a fast-forward switch circuit 412 . The fruit bunch switch circuit 413 connects the reproduction method specifying means 23 to the memory circuit 491 and the determining means 482.
corresponds to the selection means 24, and the reading control means 483 corresponds to the reading side control means 25, respectively.

The recording medium and recording medium reproducing apparatus of this embodiment configured as described above will be described in detail below.

The CDROM disk, which is the recording medium of this embodiment, contains a plurality of image data 61 similar to the conventional example, that is, 400 pixels vertically, 640 pixels horizontally, and 4 bits per pixel, and one image data for each image data. Record the next image address 33. The next image address 33 is an address for fast forward playback (3 bytes).

Two addresses (3 bytes) for fast rewind playback (
(6 bytes in total). Details will be described later. The next image address 33 is for each image data 6 as shown in FIG.
Added before 1.

One image data 61 with next image address 33 added
is divided into 2048 byte units starting from the beginning. When a fraction is found, a considerable number of 0 areas 32 are added to make it 2048 bytes. Each 2048 bytes are treated as user data 53, and auxiliary data 54 . to=16-lada52. A synchronization pattern 51 is added and recorded on the CDROM disc 41. Specifically, image data 61
The data amount is 128,000 bytes, and 6 bytes of the next image address 33 are added to this, making a total of 128,006 bytes of data.

If this data is divided into 2048-byte units, 2048-byte data is divided into 62 pieces and 1030-byte data is divided into 1 piece.

128008÷2048=62 remainder 1030103
For 0-byte data, 1018 bytes of 0 are added to the 0-byte area 82) to make the data amount equal to 2048 bytes.

2048-103021018 After that, the auxiliary data 54. Header 52.
Complete the block by adding synchronization pattern 51, and write the CD.
It is recorded on the ROM disk 41.

As a result, one image data is divided into 63 blocks and recorded.In this embodiment, the next image address 33 will be explained in detail. These addresses are determined as follows. First, the address for fast-forward playback is the first block address of the second image data to the image data to which it belongs. Here, 63
Since one image data is recorded in a block, for example, the first block address 5 of the image data to which it belongs
If 21 is 2 minutes, 0 seconds, and 0 blocks, the next image address for fast forward playback will be 2 minutes, 1 second, and 51 blocks (
63 [blocks x 2 = 126 [blocks = 1 [seconds + 51 blocks], where 1 second = 75 blocks).

Further, the address for fast rewind playback is the first block address of the image data two pieces before the image data to which the image data itself belongs. For example, if the first block address 521 of the image data to which you belong is 2 minutes 0 seconds O block, the address for fast rewind playback is also 1 minute 58 seconds 24.
Become a block.

Next, the operation of the CDROM player that plays back the CDROM disk 41 on which a plurality of image data 61 are recorded as described above will be explained.

In order to read data from the CDROM disk 41, the servo circuit 42 operates a spindle servo for the spindle motor 43, and a focus servo and traverse servo for the pickup 44.

Apply tracking servo. The pickup 44 reads data from the CD ROM disk 41 by optical means and outputs it as an analog electrical signal. The analog electrical signal output from the pickup 44 is sent to the waveform shaping circuit 4
5, the signal is converted into a pulse signal and input to the digital signal processing circuit 46.

The digital signal processing circuit 46 extracts digital data from the input pulse signal, performs processing such as error detection and correction and synchronization detection on the user data 53, and outputs a block address 521 shown in FIG. 5 to the microprocessor 48.
Prepare to output the user data 53 to the internal bus 47,
When preparations are completed, a data transfer request is notified to the separating means 481.

Upon receiving the data transfer request, the separating means 481 reads the user data 53 from the digital signal processing circuit 46, separates it into image data 61 and next image address 33, and transfers them to the video memory 411 and the memory circuit 49, respectively. That is, the separation means 481 has a counter function, transfers the first 6 bytes of data as the next image address 33 to the memory circuit 49, and transfers the next < 128,000 bytes of data as image data 61 to the video via the image processing output circuit 410. It is transferred to the memory 411, and the data of <1018 bytes is determined to be the area 32 of O and is discarded. The image data is stored in the video memory 411, and the image processing output means 4
10 performs digital-to-analog conversion and outputs it as an image signal.

When the fast forward button is pressed during playback of the CDROM disc 41 and the fast forward switch circuit 412 is turned on, the determining means 482 in the microprocessor 48 senses that the fast forward switch circuit 412 is turned on. Among the next image addresses 33 recorded in the memory circuit 49, the address for fast forward reproduction is outputted to the readout control means 483 as the next image address. Similarly, when the fruit cluster button is pressed and the fast return switch circuit 413 is turned on, the address for fast return playback is output. When the readout control means 483 receives the next image address from the determination means 482, it performs the following processing. The block address of the data read from the disk (outputted by the digital signal processing circuit 46) is compared with the address received from the determining means 482, the difference between the two is converted to the number of tracks, and the number of tracks is calculated. Perform a truck kick. After the playback position is moved to the track where the target address exists, rotation is waited until the block at the target address reaches the read position of the pickup 44. Furthermore, at the time when access to the block indicated by the next image address is started, issuing a transfer request for the user data 53 to the digital signal processing circuit 46 is prohibited, the separating means 481 clears the built-in counter, and reproduces the data. A request to transfer the user data 53 is allowed to be issued from the time when the specified block address 521 and the specified next image address match. Servo circuit 42
Then, according to the instructions from the read control means 483, the CD ROM disk 41 is played back and data at the designated address is read out.

Here, we will explain why fast-forward playback or fast-reverse playback is possible by determining the next image address 33 as described above. As mentioned above, the image data is recorded in 63 consecutive blocks. This is approximately 1.05 in length
[The linear velocity becomes 1.25 [meters/second], 75 [blocks/second], 1.25 [meters 7 seconds] ÷ 75 [blocks 7 seconds] XEf3 [blocks]). By the way, the innermost circumference of a CDROM disk (diameter 0.05
The length of one round of the track (r meter) is approximately 0.15
The length of one round of the track at the outermost circumference (0.116 meters in diameter) is approximately 0.364 meters. As a result, one piece of image data is always recorded over multiple tracks. The read control means 483 controls the servo circuit 42 to perform a track kick when the difference between the address of the block currently being reproduced and the specified next image address is greater than or equal to the number of blocks recorded in one round of the track. The next image data or 2
When accessing the previous image data, a track kick is performed, and data for several tracks are skipped, making it possible to perform fast-forward or fast-reverse playback.

As described above, according to this embodiment, when recording the image data 61 on the recording medium, for each image data 61, the next image data indicating the position on the information recording medium of the image data to be reproduced next during special reproduction is displayed. A reading unit (servo circuit 42, spindle motor 43, pickup 44, waveform shaping circuit 45, digital signal processing circuit) records the image address 33 and reads out image data and next image data from the recording medium as a recording medium reproducing device. 462 separating means 481), a reproduction method specifying means (fast-forward switch circuit 412, fruit bunch switch circuit 413) for instructing the reproduction method of special reproduction, and a reproduction method specified by the read next image address. It includes a selection means (memory circuit 499 determination means 482) for selecting a matching next image address, and a readout control means (readout control means 483) for controlling the readout means to read out the image data pointed to by the selected next image address. By providing a recording medium playback device that has a recording medium that has multiple image data continuously recorded, it is possible to see normal data on the display screen when performing fast-forward and fast-reverse playback on a recording medium on which multiple pieces of image data have been continuously recorded. Images can be displayed. In addition, in order to record the address of the image data to be reproduced during special playback as the next image data, among the multiple pieces of image data recorded on the recording medium, the image data that the recording medium creator particularly wants to see can be selected as the next image data. It can be specified using an image address, and it is possible to provide a recording medium creator with an expression method other than normal playback.

In this embodiment, addresses for fast-forward playback and fast-reverse playback are recorded on the recording medium as next image addresses, but for example, multiple types of next image addresses can be prepared for reverse playback or even for the same fast-forward playback depending on the speed. The next image address may be any address as long as it indicates the position of the image data on the recording medium.

Further, in this embodiment, a CDROM disk is used as the recording medium, but any medium such as DAT may be used as long as it can continuously record image data.

Further, in this embodiment, the next image address is added to the front of each image data and recorded, but for example, the next image address may be recorded in a block different from the image data recorded after the image data.
It may be recorded in any location as long as it corresponds to each image data and can be read out by the reading means.

In addition, in this embodiment, as the operation of the selection means, the CDRO
The next image address read from M41 is stored in the memory circuit 49.
For example, the next image address may be stored in the internal memory of the microprocessor 48, or the next image address 33 may be recorded after the image data 61. Then, the separation means 481 directly determines the next image address 61 by the discrimination means 48.
When special playback is instructed, the determining means 482 waits for the next image address 33 to be input, selects and outputs the address corresponding to the instructed special playback from the input next image address 33. You may use a method such as the method of

In addition, in this embodiment, the case where only image data is recorded has been described, but for example, the case where only image data is recorded is recorded. The present invention can also be applied to the case where a block in which compressed audio etc. is recorded and a block in which image data is recorded are interleaved and recorded as is done in XA). In this case, a next image address may be added to each image data before interleaving.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, when a plurality of image data are continuously recorded on a recording medium, along with the image data,
A recording medium in which a next image address indicating the position on the recording medium of the image data to be reproduced next to each of the above-mentioned image data during special reproduction such as fast forward reproduction, reverse reproduction, and fast reverse reproduction, and image data from this recording medium. a reading means for reading out the next image address; a reproduction method specifying means for specifying the special reproduction method; and a next image address of the image data to be reproduced next from among the read next image addresses according to the specified reproduction method. a plurality of image data by a recording medium playback device comprising a selection means for selecting a next image address, and a readout control means for controlling the readout means to read out the image data pointed to by the next image address selected by the selection means from the recording medium. It is an object of the present invention to provide a recording medium and a recording medium playback device that can record continuously and display a normal image without data loss during special playback such as fast-forward playback, reverse playback, and fast-reverse playback. It can be done, and its practical effects are great.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of a recording medium according to the present invention, FIG. 2 is a conceptual diagram of a recording medium reproducing apparatus according to the present invention, FIG. 3 is a structural diagram of data recorded on a CDROM disk of this embodiment, and FIG.
The figure is a block diagram of the CDROM player of the same embodiment.
The figure is a format diagram of a block, which is the minimum unit of data access, and FIG. 6 is a diagram showing the structure of data recorded on a CDROM disk. 11... Image data, 12... Next image address, 20... Recording medium, 21... Reading means,
22... Output means, 23... Playback method designation means, 24... Selection means, 25... Readout control means.

Claims (2)

[Claims] (1) When multiple image data are continuously recorded on a recording medium, a next image address indicating the position on the recording medium of the image data to be played next after each image data during special playback is written along with each image data. The recording medium on which it was recorded. (2) reading means for reading the image data and the next image address from the recording medium according to claim 1; output means for inputting the image data and outputting it to the outside after performing predetermined processing; and specifying a special playback method. according to the reproduction method specifying means and the reproduction method specified by the reproduction method specifying means,
selecting means for selecting a next image address of image data to be reproduced next from among the read next image addresses; and reading image data pointed to by the next image address selected by the selecting means from the recording medium. and readout control means for controlling the readout means.