JPH0489671A - Cd-rom driving device - Google Patents

Abstract

PURPOSE:To possess data in plural areas recorded near a CD-ROM in a short time by providing a read block detecting method deciding means and a read control means. CONSTITUTION:A read block detecting method deciding means 19 is provided, the time required for detecting a reading head block calculated by a seek time calculating means 17 and a reproducing time calculating means 18 is compared and when the time required for detecting the read head block calculated by the seek time calculating means 17 is shorter, a read block detecting method is decided as a seek operation. On the other hand, when the time required for detecting the read block calculated by the reproducing time calculating means 18 is shorter, the read block detecting method is decided as a reproducing operation. A read control means 15 detects the head block in the read area according to the read block detecting method decided by the above-mentioned read block detecting method deciding means, and the data in the plural areas of a CD-ROM 1 are read. Thus, the data in the plural areas recorded close to the CD-ROM can be possessed in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an access method in a CD-ROM drive device.

[Prior art] Figure 4 shows, for example, a publication (Toshiba Shiview Vol. 42 No. 6+:E
FIG. 1 is a block diagram showing the overall configuration of a conventional CD-ROM drive device shown in ``The rcD-ROM and Encoding System''. In the figure, (1) is a CD-ROM,
(2) is the disk motor, (3) is the disk motor control section, (4) is the pick-up, (5) is the pickup control section, (6) is the audio signal processing section, (7) is the C
A D-ROM signal processing section, (8) a host convenitor interface, and (9) a system controller.

Next, the operation will be explained. Disc motor control phloem (3
) controls the disk motor (2) so that the CD-ROM (1) rotates at a constant linear velocity. The pink-up control section (5) controls the focus, l-racking, and movement of the pick-up amplifier (4) of the pickup (4), and controls the pickup (4) to read the CD-ROM (1). Retrieves the pit information stored in the . The audio signal processing unit (6) decodes audio data and subcodes from the pit information obtained by the pickup (4), and extracts the clock component included in the above-mentioned period information, and the disc motor control unit (3) decodes it as described above. It is then supplied to the disk motor (3) as a feedback signal for controlling the rotation of the CD-ROM (1). The CD-ROM signal processing section (7) converts the A-dio data obtained by the audio 1 signal processing section (6) into a CD-ROM signal processing section (7).
Decoding the OM data and decoding the address assigned to the data (hereinafter, this decoded address will be referred to as a read block address).

Do this. Hereinafter, the audio signal processing unit (
6) and CD-ROM signal processing unit (7)
The operation of reading OM data and reading block addresses is called a playback operation. The host comvisitor interface (8) is connected to the CD-ROM by this CD-ROM drive device.
At the interface with the host computer (f shown in the figure) that acquires the data of M (1), the system controller (9 ), and the CD-ROM signal processing unit (7) outputs 1
Transfer the M9y-coded CD-ROM data to the host computer. The system controller (9) causes the pick-up/amplifier control unit (5) to move the pickup (4) to the vicinity of the read start block address specified by the read command, and then performs a playback operation to address the read block address. By comparing the read start block address with the read start block address, the block specified by the read start block address is detected, and the transfer of the CD-ROM data of that block to the host computer is started, and the playback operation is continued. CD- for the number of read discs specified in the read command.
Transfer ROM data to host combinator. below,
As mentioned above, the operation of detecting the block at the specified block address by the movement and playback operation of be-pickup (4) is called a nok operation.

[Problems to be Solved by the Invention] In the conventional device described above, when reading data from a plurality of areas recorded in close proximity to a CD-ROM from a postcomputer, a read command is issued for each area from the host computer. There is a problem that a seek operation occurs for each area to be read, and because of the time required for this seek operation, the larger the number of areas to be read, the longer it takes to acquire data of all the required areas.

This invention was made to solve the above-mentioned problems, and aims to provide a CD-ROM drive device that can acquire data in multiple areas recorded close to a CD-ROM in a short time. [Means for Solving the Problems] A CD-ROM drive device according to the present invention provides a seek time calculation means for calculating the time required to detect the first block to be read when the first block to be read is detected by a seek operation. and a playback time calculation means for calculating the time required to detect the read start block when the read start block is detected by a playback operation, and a read start block obtained by the above-mentioned nok time calculation means and playback time calculation means. If the time required to detect the first block of the read that has been violated by the above-mentioned nok time calculation means is shorter, the read block detection method is determined to be 7-1k operation, and the read that has been violated by the above-mentioned playback time calculation means is determined. If the time required to detect the block is short, a read block detection method determining means determines the read block detecting method to be a reproduction operation, and a read block detecting method determined by the read block detecting method determining means detects the first block of the read area. It has a reading control means for detecting and reading a plurality of areas of a CD-ROM.

[Operation] The reading block detection method determining means and reading control means of the present invention shorten the time required to tamper with data in a plurality of areas of a CD-ROM.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
The figure is an overall view showing the overall configuration of a CD-ROM drive device according to an embodiment of the present invention, in which a disk motor (2 ) a rotational speed control means (10) for controlling the rotational speed; a focus for a pickup (4) for detecting pin/node information recorded on the CDROM (1);
A pica knob control means (11) that controls the tracking knob and its movement, and decodes the 1-dio data and subcode from the pit information obtained by the pick knob (4) and extracts the black rift component included in the focus information. audio signal processing means (12) for providing feedback to the disk motor control section (3);
A-C decoding the CD-ROM data from the audio data processed by the audio signal processing means (12) and determining the iK code of the block address assigned to the data;
D-ROM signal processing means (13) and host computer input/output means (13) for inputting read commands from the host computer and outputting CD-ROM data obtained by the CD-ROM signal processing means to the host computer.
4), and reading area storage means (16) for storing a reading area designated by a reading command from the host computer via the host computer input/output means (14) and the reading control means (15). , a nok time calculation means (17) for calculating a seek time, a playback time calculation means (18) for calculating a playback time, and a seek time obtained from the nok time calculation means (17) and the playback time calculation means (18). ), the read block detection method determining means (19) determines the read block detection method by comparing the playback time obtained from 1 from 1 to 1; The reading control means (15) controls the above-mentioned means and provides the host computer with the CD-ROM data in the area specified by the reading command.

FIG. 2 is a block diagram showing the electrical connections of the embodiment shown in FIG.
1) is a microcomputer, (22) is a read memory (hereinafter referred to as program ROM) that stores programs for the microcomputer (21), and (23) is a lead memory that stores a read time table and block address information. Memory (hereinafter tsuku l (i table R)
(referred to as OM), (24> is Ranodum access memory (
(hereinafter referred to as RAM).

Figure 3 shows the program R of the microcomputer (21).
Flowchart 1 shows a program stored in OM (22). Hereinafter, the operation of the embodiment will be explained with reference to FIG.

First, in step (30), wait for the read command of the host computer to be intercepted via the host computer interface (8).
1) Process. In step (31), step (
The number N of read areas designated by the read command recorded in step 30) is set in the read area counter CNT on the RAM (24). Furthermore, a read area table RAT(n,i) is created on the RAM (24) based on the read command. The above RAT (n, i) is a two-dimensional array,
n takes a value from 1 to N, RAT (n, I) indicates the start block address of the nth area of the area specified by the read command, and RAT (n, 21) indicates the start block address of the nth area of the area specified by the read command. Indicates the read block length of the nth area.

Ste Nobu (32) has RAT (N-CNT+1.
I) is read and the first block address At, RAT(
N-CNT+1. 2) Read the first block length +
) in the RAM (24).

In step (33), the no time table ROM (23
) is stored in the node time table STT (j+) and the block address table BAT (kl) at the read header obtained in step (32).

Find the seek time of Tsuku. The above block address table BAT (k) is a one-dimensional array, where k is a value between 1 and 1.
Take positive integer values up to BAT (k) BAT (k
The seek time table 5TT(i, j) is a two-dimensional array where i is a positive integer from 1 to K and j is 1.
to a certain value J, and the currently detected block address Ac is BAT (i − j) < Ac
When ≦BAT (i), the time required to detect a block that is more than (j-1)XD blocks and less than j×D blocks away from Ac by a seek operation is stored. Find i that satisfies the following formula for At obtained in step (32), and find BAT (i-1)<At≦BAT (i)j by the following formula, j= (integer part of lAt-ACl/D) +1-i above,
5TT (i, j) for j with Ste Knob (32
) is stored in the RAM (24) as the 7th clock time Ts of the read first block.

In step (34), the time Td required for detecting At obtained in step (32) from the currently detected RUFRO 9T dress Ac by the reproducing operation is determined by the following equation.

Td= (A t-Ac)X (1-75)Sterip(
35), Ts obtained in step (33) and step (
34), and if Ts≧Td, the reading block detection method is determined to be a reproduction operation, and Ts
If <Td, the read block detection method is a seek operation.

In step (36), the result of determining the read block detection method in step (35) is determined, and if the determination result is a seek operation, the step knob (37) process is performed, and if the determination result is a playback operation, the process of step (38) is performed. .

In step (37), the pickup control unit (5) controls the pickup (4) at the At value obtained in step (32).
The audio signal processing unit (6) starts decoding the pit information detected by the pickup (4) to obtain the subcode and audio data of each block, and the audio data written in the obtained subcode. When the block address becomes At-1, the CD-ROM signal processing section (7) starts decoding the audio data obtained by the audio signal processing section (6) and reads the block address and CD-ROM data of each block. The obtained block address is checked to see if it matches At, and if they match, the process of step (39) is performed.

The Ste Lip (38) starts decoding the pit information detected by the pickup (4) from the current position of the Pisoqua Knob (4), obtains the subcode and audio data of each block, and (:, D- ROM signal processing section (7
) starts decoding the audio data given by the order signal processing unit (6), and the block address of each program and the obtained block address of the CD-ROM 0M controller 1q is returned to At. If they match, the process of step (39) is performed.

In step (39), step reply (37) or step <38) is 1! #Rare block address A [CD]
-Transfer 4 data to RO to the host computer through the host computer interface <8), and then transfer only the Lb-1 block from the pro-work address At+1 to the CD-
The ROM data is decoded and transferred to the host computer, and the process of step (40) is performed.

In step (40), the reading area counter CNT is set to 1.
If the result is O, Ste Tsubu (32)
Go to , repeat the above operation, and if it is 0, end the operation.

As shown in item 2, when reading data from a plurality of adjacent areas of a CD-ROM, detection of the beginning of the reading area is performed by a reproducing operation, so that the time required for reading can be shortened.

[Effects of the Invention] As described above, according to the second invention, the time required to detect the first block to be read is determined when the first block to be read is detected by a shearing operation. A playback time calculation means for calculating the time required to detect the read start block when the start block is detected by a playback operation, and a playback time calculation means for determining the time required to detect the read start block when the start block is detected by the playback operation; Compare the times, and if the time required to detect the read head block that has been violated by the above-mentioned seek time calculation means is short, the reading process/lack detection method is determined to be a seek operation, and the above-mentioned playback time calculation means determines the read operation. a reading block detection method determining means that determines the reading block detection method to be a reproduction operation if the time required to detect a given reading block is short; Detect the first block and
Since the apparatus includes a read control means for reading data from a plurality of areas of the D-ROM, it is possible to obtain data from a plurality of areas recorded close to the CD-ROM in a short time.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the overall configuration of a CD-ROM drive device according to an embodiment of the present invention, FIG. 2 is a block diagram showing its electrical connections, and FIG. 3 is a flowchart showing its operation.・FIG. 4 is a block diagram showing the overall configuration of a conventional CD-ROM drive device. In the figure, (1) is the CD-ROM, (2) is the disk motor, (3) is the disk motor control section, (4) is the PIC amplifier, (5) is the pink-up control section, (6) is the
(7) is a CD-ROM signal processing unit, (8) is a host convenience store interface, (
9) is a nostem controller, (10) is a rotational speed control means, (11) is a pickup control means, (12)
(13) is an audio signal processing means, (13) is a CD-ROM signal processing means, (14) is a host computer input/output means, (15) is a reading control means, (16) is a reading area storage means, and (17) is a NO. Time calculation means, (18)
(19) is a playback time calculation means, (19) is a read block detection method determining means, (20) is an input/output circuit, (21) is a microcombinator, (22) is a program ROM, (23) is a seek time table ROM, (24) is RA
It is M. Note that the symbols in the middle of each figure indicate the same or equivalent parts.

Claims (1)

[Claims] Seek time calculation means for calculating the time required to detect the first block to be read when the first block to be read is detected by a seek operation, and the first block to be read when the first block to be read is detected by a playback operation. A playback time calculation means for calculating the time required to detect the first block is compared with the time required to detect the leading block to be read obtained by the seek time calculation means and the playback time calculation means, If the time required to detect the first block to be read is short, the read block detection method is determined to be a seek operation, and if the time required to detect the read block obtained by the reproduction time calculation means is short, the read block detection method is determined to be a reproduction operation. a read block detection method determining means for determining the read block detection method to be read, and a read control for detecting the first block of the read area by the read block detecting method determined by the read block detecting method determining means and reading data in a plurality of areas of the CD-ROM. C characterized by having means.
D-ROM drive device.