JP2899453B2 - Reading control method of interactive display data - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method for reading interactive display data using a CD ROM player or the like.

[0002]

2. Description of the Related Art A moving picture recording / reproducing system for recording moving picture data for games or education for data compression while recording the data on a CDROM, reading out and reproducing the data, and interactively displaying the data is under development. It is.

[0003]

In such an interactive display device, the presence or absence of a branch of a read address of moving image data is determined according to a command from a viewer. Therefore, as shown in FIG. 3, when a branch is commanded, it is necessary to quickly seek the read head from the branch point A to the branch destination B. During this seek period, the moving image data from the CDROM is required. Reading must be interrupted. For this reason, it is difficult to continuously display moving image data without interruption before and after branching, and in the related art, display is interrupted, or a previously prepared still screen is inserted at a joint of moving images. I have. Also, JP-A-1-163825, "Data
Based storage and access methods include a staircase tree
A database search system that has a structure and sequentially selects and searches
System is disclosed and among multiple files to select
From multiple files that may be selected
And read ahead at once, and select the files
By displaying only the data of the
A method has been described in which the time is shortened. I
However, this method has the potential for data selection.
There are a large number of files, and data is selected in an alternative format
Is not performed, so the buffer memory can be selected.
Storage capacity to store all potential files
Will be required. For this reason, for example, many (n
Files), the file with the highest selectability
About the read head temporarily.
Buffer memory only for (n-1) files
Compared to the method of saving in the buffer memory.
As the storage capacity is equivalent to n / (n-1) times,
Buffer memory requires more storage capacity,
The current cost was also large, and other problems were encountered. Ma
Also, Japanese Patent Application Laid-Open No. H2-218063, "Disk I / O Control
The expression includes the host computer after input / output of the disk unit.
The access history is saved during
The most frequently used ones in the history of
Track that is most likely to be
Head ahead to track most likely to be lost
The time spent moving the head.
A method that removes it from the required access time is disclosed.
ing. However, this scheme then accesses
The next most likely track number is
Table, and determine the next file access
Advance the head to the next track before the request comes
Therefore, the next track to be actually accessed is
A place different from the expected highly accessible truck
In other words, if the prediction is
The head must be re-moved to the track
Does not contribute to a reduction in access time during
Head movement cannot always be removed from the access time,
There is a problem that there is a limit in increasing the access speed.
It was something you could get. Furthermore, Japanese Patent Application Laid-Open No. 57-1050
No.61 "How to control advance seek of floppy disk drive"
Access to the last recorded part on the track is completed
At that point, without waiting for a seek instruction from the CPU,
Immediately move the magnetic head over the adjacent track, and
A method for shortening the time is disclosed. Only
While this method involves the seek operation of the magnetic head
Access to the last recorded part to save time
At the same time as the completion,
Just move the head
If it becomes necessary to read the rack repeatedly,
Automatically switch to adjacent track after access to recorded part is completed
Move the moving magnetic head back to the original track
The seek operation during this time shortens the access time
To improve access efficiency in any case
Issues that may not always be possible.
Was. The present invention has solved the above-mentioned problems, and has a display data.
Whether or not the data read address is branched through dialogue with the viewer
And a smooth slide before and after the junction
It is intended to enable kana display.

[0004]

Means for Solving the Problems To achieve the above object,
Therefore, according to the present invention, the reading position by the reading head is
Read data from the recording medium determined through the story
The crossing that involves the seek operation of the read head to another track
If a branch point that branches off from the main line is included,
Ahead of the data in the specified address range on the main line.
And save it, before the seek destination on the crossroads
Move the read head to wait for the selection at the branch point.
That is, if a branch is selected at the branch point,
The data read by the read head waiting at the seek destination
Data at the branch point
If no branch is selected, read ahead and save
Data that has already been read as display data,
Move the take head from the seek destination to the end position of the preceding reading
It is characterized by moving again.

[0005]

FIG. 2 is a block diagram showing a configuration of an interactive data display apparatus to which a reading control method according to an embodiment of the present invention is applied, and comprises a main system 30 and a CDROM drive system 40. . The main system 30 is a CP
The CDROM drive system 40 includes a U31, a decoder 32, a frame buffer 33, an input interface 34, a CRT 35, and a keyboard 36.
It is composed of

[0006] The compressed moving image data recorded on the CD ROM after being encoded for compressing the data amount is read by a read head 42 under the control of a read control circuit 41, and passed through a data buffer 43 to a decoder. 32, decoded and restored to the original moving image data, supplied to a CRT 35 via a frame buffer 33 such as a screen memory, and displayed. This video data constitutes a part, such as a game for the software, with the viewer from the keyboard 36
It includes a branch point that can branch to various scenes according to a command input through the dialog . At these stops,
This is a crossroad that involves the seek operation of the read head to another track.
It branches off from the main line and the main line or the branch through dialogue with the viewer.
A choice of road is made.

FIG. 1 is a flowchart showing a procedure of a reading control method according to one embodiment of the present invention, which is executed by the reading control circuit 41 of FIG.

The read control circuit 41 reads a predetermined amount of data from the CDROM and stores it in the built-in buffer 44 (step 11), and the read data stored in the built-in buffer 44 is transferred to the branch point (point A in FIG. 3). ) Is checked (step 12). If the read data does not include the branch point, the read data is transferred from the built-in buffer 44 to the data buffer 43 (step 13), and the process returns to step 11.

If the read data stored in the built-in buffer 44 includes a branch point, the read control circuit 41 determines a predetermined address area beyond the branch point ( from the point A in FIG. 3).
Address area included in a certain area on the same track
3 ), the data is read in advance from the data area and stored in the built-in buffer 44 (step 14).
(Point B in the case of (1)) (step 15). Next, the read control circuit 41 transfers the read data stored in the internal buffer 44 up to the branch point from the internal buffer 44 to the data buffer 43 (step 1).
6), a state of waiting for the main system 30 to reach the branch point is entered (step 17). Whether or not the main system has reached the branch point is determined by monitoring whether or not the data buffer 43 is empty.

When the main system 30 reaches the branch point, a CP is input from the keyboard 36 via the input interface 34.
The presence or absence of a branch is determined based on a user command input to U31, and this is requested from the CPU 31 to the reading control circuit 41. Upon receiving the branch request, the read control circuit 41 proceeds from step 18 to step 11,
Reading of data from M and storage in the built-in buffer 44 are started. In this case, since the seek of the read head to the branch destination (point B in FIG. 3) has already been completed in step 15 described above, the data from the branch destination is not interrupted for the seek. Reading starts immediately.

Reading controlcircuit41 is in step 18
The request of the branchIf you did not receive, Built-in buffer 44
Pre-read data ahead of the branch point saved in the
From the data buffer 43 to the data buffer 43 (step 1).
9) Move the reading head to the end position of the preceding readingMove again
(Step 20), and return to Step 11. like this
While the read head is seekingIn other words, during return operation to the main line
Indicates that the preceding read data is transmitted to the main system via the data buffer 43.
Since it is supplied to the stem 30 side, it accompanies head seek
No lack of display data occurs.

[0012]

[Effect of the Invention] As described above in detail, pairs of the present invention
According to the reading control method of the speech type display data , the reading head
Seek operation to other track of read head to read data
When a crossroad with a branch includes a branch point that branches off from the main line
The data in the specified address range on the main line ahead of the branch point
Read ahead and save it, and then seek at the crossroads
Move the read head to wait for the selection at the branch point.
If a branch is selected at the branch point after
Is read by the read head already waiting at the seek destination.
Specify the data as display data, while also
And if no branch is selected, read ahead and save
Data that has already been read as display data, and
Move the head from the seek destination to the end position of the pre-reading
Therefore, the branch at the branch point is made on the crossroads side.
The read head is branched in advance in response to the
By moving it earlier, the reading head required for branching to a crossroad is
Data missing or data display during seek period of data
Omissions can be eliminated, while data on the main line side
Since it is dealt with by backing up with advance reading,
Even if no branch is selected at the branch point,
At least until the read head returns to the main line from the branch destination
Indicates the read head and returns the read head.
It is possible to eliminate the loss of display data during the operation period,
In all cases, video data should be
Data can be displayed continuously without interruption.
It works .

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating a control procedure of a method for controlling reading of interactive display data according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating an example of a configuration of an interactive display device to which the embodiment is applied.

FIG. 3 is a conceptual diagram illustrating an example of the need for a read head seek at a branch point and an example of a seek;

[Explanation of symbols]

12 Step of judging whether or not read data includes a branch point 14 Step of pre-reading ahead of a branch point 15 Step of head seeking to a branch destination 18 Step of judging the presence or absence of a branch request 19 Transferring pre-read data to the main system Step 20: Step of head seeking to the preceding reading end position

Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) G11B 27/10-27/34 G11B 19/02 G11B 20/10

Claims (1)

(57) [Claims] The reading position of a reading head is set to a pair with a viewer.
Read data from the recording medium determined through the story
The crossing that involves the seek operation of the read head to another track
If a branch point that branches off from the main line is included,
Ahead of the data in the specified address range on the main line.
And save it, before the seek destination on the crossroads
Move the read head to wait for the selection at the branch point.
That is, if a branch is selected at the branch point,
The data read by the read head waiting at the seek destination
Data at the branch point
If no branch is selected, read ahead and save
Data that has already been read as display data,
Move the take head from the seek destination to the end position of the preceding reading
And controlling the reading of the interactive display data.