JPH11283345A - Disk searching method in disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance a processing speed by converting the address of the current position of an optical pickup into a converted physical address continuously changing in the whole area of a disk and calculating a distance to be moved to enable a search with a simple program. SOLUTION: A microcomputer for control 11 reads out the physical address YP of the optical pickup 3 and the track number of a current position and converts the address YP into converted physical addresses YT, YT1 respectively expressing one series of addresses unified in the whole area of a disk 1 by prescribed calculating formulas based on the maximum address being in a readin area and a reference offset in accordance with the inside or the outside of the readin area and next it converts a target physical address into a physical address YT2 similarly. Since positions of the radial direction being on the disk 1 and the converted physical addresses are in a linear relation, the moving distance of the optical pickup 3 is easily calculated by calculating the YT1 of the current position and the YT2 of the target position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is composed of a plurality of areas. In one area, a physical address continuously changes. However, a physical address changes between one area and another area. Discs that are discontinuous, such as CDs (Comp
act disk).

[0002]

2. Description of the Related Art Conventionally, a CD is known as a storage medium for recording acoustic information and the like. This CD is composed of three areas from the inner periphery of the disc: a lead-in area in which index information of recording information is recorded, a user data area in which actual music information is recorded, and a lead-out area. I have. Information is recorded on a CD in units called frames. In each frame, in addition to actual data, information called a subcode is recorded for use in data search. Physical address information is recorded in a portion called a Q channel in the subcode. In the Q channel of the user data area and lead-out area, a track relative time indicating an elapsed time for each music piece as a physical address and an absolute time indicating an elapsed time from the beginning of the user data area are expressed in minutes, seconds, and frames (1/75) Seconds). However, in the lead-in area, in the area where the absolute time is recorded in other areas in the Q channel, the table of contents information of the disc is recorded, and as the physical address information,
Only the track relative time is recorded. In a CD, information is recorded in accordance with the above logical format. Therefore, a physical address that can be used in the lead-in area is only a track relative time that is not continuous with another area, and physical address information that is continuous in all areas is recorded. It has not been.
Therefore, when calculating the moving distance of the optical pickup when searching for the target data in the CD reproducing apparatus, the moving distance in the lead-in area and the moving distance in the other two areas are separately obtained, and the total is calculated. And asked for a method.

[0003]

However, in the above-described conventional method, the distance traveled in the lead-in area and the distance traveled in the other two areas are required to determine the distance traveled by the optical pickup when searching for data. Therefore, when the moving distance is calculated by the microcomputer, there is a problem that the structure of the program is complicated and the processing speed is reduced. An object of the present invention is to calculate the moving distance of the optical pickup at the time of data search by a simple method, to make a microcomputer program simple, and to improve the processing speed.

[0004]

In order to solve the above-mentioned problems, the present invention comprises a plurality of areas. In one area, a physical address changes continuously. When searching for a disc in which the physical address changes discontinuously among the areas of the disc, the physical address of the current position of the pickup is converted to a converted physical address that changes continuously in the entire area of the disc, The movement distance from the current position to the target position is calculated using the logical address of the position, and the pickup is moved to the target position.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic block diagram of a compact disc reproducing apparatus for implementing the data search method of the present invention. Reference numeral 1 denotes a compact disc on which music data is recorded together with subcode data.
2 is a spindle motor for rotating the compact disc 1 at a predetermined linear speed, and 3 is a
An optical pickup for irradiating a laser beam and detecting a signal recorded on the CD 1 from the reflected beam; 4, a feed motor for feeding the optical pickup 3 in the radial direction of the compact disc 1; 5; an EFM signal from a detection signal of the optical pickup 3;
An RF amplifier for generating an error signal, a CLV control signal, etc.
Reference numeral 6 denotes a servo circuit that applies a predetermined servo to the spindle motor 2, the optical pickup 3, and the feed motor 4 in accordance with a command from a control microcomputer described later using an error signal, a CLV control signal, and the like. A digital signal processing circuit that performs synchronization, deinterleaving, error correction, and the like on the output EFM signal to demodulate audio sample data and subcode data. Reference numerals 8 and 9 denote D / A converters which D / A convert and output audio sample data output from the digital signal processing circuit for each channel, and 10 denotes a P / A converter.
An operation unit 11 having a LAY key, a STOP key, a music selection key, and the like, and a control microcomputer 11 for controlling the entire CD player in accordance with an operation on the operation unit. When the compact disk 1 is set in the compact disk reproducing device, the control microcomputer 11
Start up various servos, move the optical pickup 3 to the lead-in area, and
The TOC is controlled by controlling the amplifier 5 and the digital signal processing circuit 7.
The information and the maximum physical address in the lead-in area are read and stored in the built-in memory 12, and the TOC information in which the physical address at which each program starts on the compact disc is recorded is read and stored in the built-in memory 12. deep. FIG. 2 is a diagram showing a relationship between a radial position on a compact disc and a physical address value. In FIG. 2, the x-axis represents the radial position on the compact disc starting from the innermost periphery of the compact disc, and the y-axis represents the physical address value. In FIG. 2, a straight line 13a shows a relationship between a radial position on the compact disc in the lead-in area and a physical address value (track relative time), and a straight line 13b shows a radius on the disc in the user data area and the lead-out area. The relationship between the direction position and the physical address value (absolute time from the beginning of the user data area) is shown. FIG. 3 is a diagram showing the relationship between the translated physical address (corresponding to the unified address in claim 2) generated by the disc search method of the present invention, the physical address and the radial position on the compact disc. In FIG. 2, the x-axis is the radial position on the compact disc starting from the innermost periphery of the compact disc, and the y-axis is the physical address value and the converted physical address value, similarly to the x-axis in FIG. In FIG. 3, a straight line 14 indicates the relationship between the radial position on the compact disc and the converted physical address value generated by the search method of the present invention. FIG. 4 is a diagram showing the correlation between the radial position on the disk, the physical address value, and the converted physical address generated by the search method of the present invention. In FIG. 4, the x-axis is the radial position on the disk, as in FIGS. 1 and 2, and the y-axis is the physical address value or converted physical address value. FIG. 5 is a flowchart for explaining the search method of the present invention, which is composed of steps 101 to 106. The search method of the present invention will be described with reference to the above-described drawings. First, in the compact disk reproducing apparatus, it is assumed that the optical pickup is at an arbitrary radial position on the compact disk. The reading of the target data is performed according to a program stored in the internal memory 12. FIG. 5 is a flowchart showing the procedure of the program. First,
In step 101, the compact disc reproducing apparatus sets the physical address YP of the position where the optical pickup is
And the track number. Next, the compact disc reproducing apparatus checks whether or not the current position is in the lead-in area from the track number read in step 101 (step 102). Q of lead-in area
Since 00 is recorded on the channel as the track number, if the track number is 00, it is known that the channel is a lead-in area. Next, if the current position is the lead-in area, the process proceeds to step 103. In step 103, the physical address YP of the current position is Y
It is converted to a converted physical address YT according to the formula of T = Y0- (L-YP).

[0006] Here, L is at the time of starting the disk reproducing apparatus.
This is the largest physical address in the lead-in area acquired in advance. Y0 is a reference offset, which is a fixed numerical value larger than L. On the other hand, if the current position of the optical pickup is not in the lead-in area, that is, in the user data area or the lead-out area, the process proceeds to step 104. In step 104, the data is converted into a converted physical address YT according to the calculation formula of YT1 = Y0 + YP.

The relationship between the converted physical address value generated by the processing in step 103 or 104 and the physical address value before conversion is as shown in FIG. That is, the physical address value before conversion becomes discontinuous between the lead-in area and the user data area, whereas the converted physical address is a series of addresses that are unified in the entire area of the disk. Next, in step 105, the target physical address YL of the music piece to be read is calculated according to the following formula: YT2 = YL + Y0.
It is converted to a converted physical address YT2. The physical address value YL of the music to be read is obtained from the music specified by the operator via the operation unit and the TOC information stored in the above-described internal memory. Next, the process proceeds to step 106. In step 106, the moving distance of the optical pickup is calculated from the converted physical address YT1 of the current position and the converted physical address YT2 of the target position. If YT1 and YT2 are known, the moving distance can be easily calculated since the radial position on the disk and the converted physical address have a linear relationship.
In the next step 107, the optical pickup is moved by the movement distance obtained in step 106, and the search for the target data is completed. As described above, according to the present invention, a search for target data can be performed by simple processing, and the structure of a microcomputer program that controls the search can be simplified.
The processing speed can also be improved.

In the above description, when the conversion from the physical address to the conversion physics and the movement distance of the pickup are obtained, predetermined calculations are performed.
Instead of this calculation, it is also possible to create a predetermined table and obtain it from this table.

In the above description, a music CD has been described as an example of a disc on which information is recorded. However, the present invention is not limited to this. The present invention is also applicable to a case in which a pickup of a disk reproducing apparatus for reproducing information from a disk-shaped information recording medium having no series of physical addresses is moved.

Further, in the above description, the control microcomputer is described as being already programmed to perform the above-described operation, but the control microcomputer is stored in a recording medium such as a floppy disk or a CD-ROM. May be recorded, and the program may be read from the program, or may be temporarily copied to the built-in memory and then read.

[0011]

As described above, the disk search method according to the present invention comprises a plurality of areas. In one area, the physical address changes continuously. When searching for a disc in which the physical address changes discontinuously, the physical address of the current position of the pickup is changed to a converted physical address (a series of unified addresses over the entire area) that continuously changes in the entire area of the disc. Converting, using the converted physical address and the converted physical address of the target position, obtaining a movement distance from the current position to the target position, and moving the pickup to the target position. With simple processing, the target data can be searched. The microcomputer program for controlling the search can be simplified and the processing speed can be improved. An effect that can be.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the overall configuration of a CD reproducing apparatus for implementing a disk search method according to the present invention.

FIG. 2 is an explanatory diagram showing a relationship between a position on a disk and a physical address value in a CD.

FIG. 3 is an explanatory diagram showing a relationship between a position on a disk in a CD, a physical address value, and a converted physical address value generated by the disk search method of the present invention.

FIG. 4 is an explanatory diagram showing a relationship between a position on a disc on a CD, a logical address value, and a converted physical address value.

FIG. 5 is a flowchart showing a procedure of a disc search method according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Compact disc 2 Spindle motor 3 Optical pickup 4 Feed motor 5 RF amplifier 6 Servo circuit 7 Digital signal processing circuit 8 D / A converter 9 D / A converter 10 Operation unit 11 Control microcomputer 12 Internal memory 13a Lead-in area 13b A straight line representing the relationship between the position on the disk and the physical address value in the user data area and the lead-out area 13b A straight line representing the relationship between the position on the disk and the converted physical address 15 A straight line representing the relationship between the position on the disk in the user data area and the logical address value 16 A straight line representing the relationship between the position on the disk in the user data area and the converted physical address value

Claims (3)

[Claims] 1. A search is made for a disk which is composed of a plurality of areas and in which physical addresses change continuously in one area, but in which changes in physical addresses are discontinuous between one area and another area. In doing so, the physical address of the current position of the pickup is converted into a converted physical address that continuously changes in the entire area of the disk, and the converted physical address and the converted physical address of the target position are used to convert the physical address of the pickup to the target position. A disc search method comprising: obtaining a movement distance to a position; and moving the pickup to a target position. 2. A pickup in a disc reproducing apparatus for reproducing information from a disc-shaped recording medium having a plurality of information recording areas on which information is recorded on an information recording surface but having no series of unified addresses over the entire information recording area. A method of setting a movement amount of the pickup, wherein a step of obtaining a current address in a series of unified address systems assumed over the entire information area from information on the current position of the pickup; and A pickup moving amount setting method, comprising: obtaining a target address in the unified address system; and obtaining a moving amount of the pickup from the current address and the target address. 3. An information recording medium, wherein a computer software program for realizing the pickup moving amount setting method according to claim 2 is recorded in a mechanically readable manner.