JP2622828B2 - Recording medium playback method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium reproducing method, and more particularly to a recording medium reproducing method capable of reproducing a digitized signal of still image information such as characters, symbols, and figures using a digital audio disk playing device. It is about the method.

[0003]

[0002]

[0004]

2. Description of the Related Art Conventionally, CAV (constant angular velocity) is used for recording still image pattern information such as characters, symbols, and figures.
There is a video disc. Generally, the recording information is recorded in the form of an analog signal, and therefore, it is necessary to use a player dedicated to video disc reproduction. On the other hand, recently, there is a digital audio disc in which an audio signal is digitized and recorded, and a digital audio disc player is becoming widespread for reproducing the disc. It would be advantageous if this digital audio disc player could be used to reproduce the video information described above. In particular, it would be even more convenient if video information could be reproduced by making effective use of the so-called search (information search) function of a digital audio disc player.

[0005]

[0003]

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a recording medium reproducing method capable of quickly reproducing digital image information such as a still image by a search function by only slightly modifying an existing digital audio disc player. .

[0007]

[0004]

[0008]

A recording medium reproducing method according to the present invention divides digital image data into blocks, divides the blocks into sub-blocks of a predetermined unit amount, and divides the sub-blocks into a digital image data portion and a position preceding the sub-block. A recording medium reproducing method for arranging an identification data portion and adding an address code indicating an absolute address of the sub-block and an identification code indicating a type of the digital image information to the identification data portion to reproduce a recording medium recorded. At the time of reproduction, the start position of a desired sub-block is detected by the identification data section, and the type of digital image information of the sub-block is determined.

[0009]

[0005]

[0010]

An embodiment will be described below with reference to the drawings.

FIG. 1 is a schematic block diagram of a reproducing system for reproducing a recording medium according to the present invention. A digital audio disc player 1 transmits reproduced digital data and reproduction control data to an interface 2. The interface 2 includes a CPU (arithmetic processing unit) 3, a video memory 4, a RAM (random access memory) 5,
A keyboard 6 and a CRTC (cathode ray tube controller) 7 are connected to each other via a data bus. This C
The CRT (cathode ray tube) 8 is controlled by the output of the RTC 7 to display reproduction information.

Digital audio disc player 1
Captures, via the interface 2, control data indicating a search address input from the keyboard 6, and performs an information search operation. For this purpose, digital information in a format as shown in FIG. 2 is recorded on the digital audio disc.

[0013]

FIG. 2 shows the arrangement of signals after decoding what is recorded on the disk. Still image pattern information such as characters, symbols, and figures is digitized and divided into blocks. For example, information data corresponding to one second is defined as one block.
Is an integer) sub-blocks of a predetermined unit amount. This sub-block corresponds to, for example, 98 frames in the CD format. One of the sub-blocks is composed of an identification data ID indicating an address of information data and the like, as shown in the figure, and data following the identification ID. This ID is sandwiched by gaps. The ID includes a start mark indicating the beginning of the address, an address,
As the control word including the control word, for example, 4 control bits in the Q channel data corresponding to 98 frames in the CD format can be used, and indicates the type of image data of the sub-block.

[0014]

The address constitutes an absolute address consisting of timer information such as a track number, minute and second, and a sub-block number in the same manner as that of an existing digital audio disk, and a search function of a conventional digital audio disk player. Can be used. Therefore, in the case of the search operation, as described above, the keyboard 6
Is made based on the address information from
When detecting the ID field, the CPU 3 compares the designated address with the reproduction address. If the two match, the next succeeding data is stored in the memory 4 and the stored data is displayed on the CRT 7 by the CRTC 7 as a display signal.

[0015]

The above operation procedure is shown in the flowchart of FIG.

[0016]

[0009]

[0017]

As described above, according to the present invention, image information such as characters, symbols, and figures is digitized on a recording medium, divided into sub-blocks having a predetermined unit data amount, and image data is stored in each sub-block. Since absolute address information was added with control bits indicating the type of
There is an advantage that an image can be reproduced by combining a device such as a microcomputer having a T display with a recording medium playing device, and that a quick image reproduction can be performed every time an absolute address for information search is searched.

[0018]

[0010] If the type of the image data is known, the coding mode of the image data will also be known, and the recording medium playing device can reproduce the data while performing decoding corresponding to the coding mode of the image data. It becomes like that.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of a reproducing system for reproducing a recording medium of the present invention.

FIG. 2 is a diagram illustrating an example of a recording format of a recording medium according to an embodiment of the present invention.

FIG. 3 is a flowchart showing an operation procedure of a block in FIG. 1;

[Description of Signs of Main Parts]

 DESCRIPTION OF SYMBOLS 1 ... Digital audio disk player 3 ... CPU 4 ... Video memory 6 ... Keyboard 8 ... CRT

 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-58-184890 (JP, A)

Claims (1)

(57) [Claims] The digital image data is divided into blocks, the blocks are divided into sub-blocks of a predetermined unit amount, and the sub-blocks are provided with a digital image data portion and an identification data portion at a position preceding the digital image data portion. A recording medium reproducing method for reproducing a recording medium on which a data portion is provided with an address code indicating an absolute address of the sub-block and an identification code indicating a type of the digital image information. A start position of a desired sub-block and a type of digital image information of the sub-block is determined.