JPH05334797A - Disk player - Google Patents

Abstract

PURPOSE:To shorten the period of time required for starting a reproduction by setting the rotational speed of a disk at the time of reading TOC data faster than that at the time of reading program information. CONSTITUTION:When a disk 1 is set on a play position, an optical head 3 is moved to the read-in area of the disk 1 and the focusing of the head 3 is executed. Then, a spindle motor 2 is started, and accelerated to a set number N1 of revolution, and at the time of the number N1, the TOC data is read. After the read data is decoded by a decoder 7 via a reading signal processing section 4, it is stored in a RAM 11 via a system control section 10. After a reading is completed, the speed of a motor 2 is reduced down toward the prescribed number N2 of revolution at the innermost periphery of a program area, and at the time of the number N2, a series of processings of a TOC reading mode is finished. After that, unless a music to be performed is specified, a first music is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc player, and more particularly to a disc player suitable for reproducing a disc having index data related to recorded program information recorded in a lead-in area.

[0002]

2. Description of the Related Art In a compact disc (CD), a TOC (Table o) related to the program information recorded in the program area is provided in the lead-in area at the innermost circumference of the disc.
f Contents) Index data called data is recorded. As shown in FIG. 3, this TOC data consists of data such as the total number of songs in the program area, the total playing time, the playing start time of each song, and the information necessary for the CD player to play the disc. Therefore, the data is recorded 75 times per second in 72-bit units.

[0003]

By the way, a maximum of 99 songs can be recorded on a compact disc due to the format, and each data is recorded three times repeatedly for the reliability of reading the data. There is. Therefore, considering the case where the maximum number of recorded songs is 99, the time required to read TOC data is

## EQU00001 ## 99 (tunes) .times.3 (times) / 75 (seconds / times) .apprxeq.4 (seconds).

On the other hand, since the TOC data corresponds to the table of contents of the information recorded on the disc, when reproducing the disc, first, before reading the program information,
This TOC data is read. However, when the maximum number of recorded songs is 99, as described above, it takes as long as 4 seconds to read the TOC data. Therefore, the user must wait for the reproduction to start during this time. become.

The present invention has been made in view of the above points, and an object of the present invention is to provide a disc player capable of shortening the time required for starting reproduction by reading TOC data at high speed. And

[0006]

DISCLOSURE OF THE INVENTION The disc player according to the present invention has a TOC associated with recorded program information.
In reproducing the disc in which the data is recorded in the lead-in area, the rotational speed of the disc when reading the TOC data in the lead-in area is set to be higher than the rotational speed of the disc when reading the program information. There is.

[0007]

When the TOC data in the lead-in area is read, the rotational speed of the disk is set to be faster than when the program information is read, so that the TOC data is read at a high speed and the time required to start playback is shortened. ..

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 2 is a block diagram showing an example of the configuration of the main part of the disc player according to the present invention. In FIG. 2, the disc 1 is, for example, a compact disc, and includes a program area in which music programs of a plurality of songs are recorded, a lead-in area inside the program area, and a lead-out area outside the program area. In the lead-in area, TOC data such as the total number of songs, total playing time, and performance start time of each song is recorded in relation to the recorded music program.

The disk 1 is rotationally driven by a spindle motor 2. The recorded information on the disc 1 is read by the optical head 3. The optical head 3 is a disk 1
Is provided so as to be movable in the radial direction of, for example, light that irradiates an information recording surface of the disc 1 with a light beam such as a laser beam and is reflected while being modulated according to a pit row (recording track) of the disc 1. The read signal S is output by receiving the beam with the built-in photodetector. The optical head 3 includes a focus control unit for keeping the light beam incident on the disc 1 in an appropriate focused state, and the disc 1
Tracking control means for properly causing the light beam incident on the recording medium to follow the recording track is built in.

A read signal S output from the optical head 3.
Is supplied to the read signal processing unit 4 and subjected to predetermined signal processing. As a result, the read signal processing section 4 outputs the reproduction output signal Sp of the TOC data, the program information and the address data, the focus error signal Sf and the tracking error signal St, respectively. The focus error signal Sf is supplied to the focus control drive unit 5. The focus control drive unit 5 controls the focus / servo by supplying a drive signal C1 corresponding to the focus error signal Sf to the focus control means of the optical head 3. Further, the tracking error signal St is supplied to the reading position control section 6. The reading position control section 6 controls the tracking servo by supplying a drive signal C2 corresponding to the tracking error signal St to the tracking control means of the optical head 3.

The reproduction output signal Sp of the TOC data, the program information and the address data output from the read signal processing section 4 is supplied to the decoder 7 to be decoded. As a result, the reproduction program information P is output from the decoder 7 and the reproduction TOC data Toc is generated.
And the reproduction address data Rd are output. And
The reproduction program information P is supplied to the program information processing unit 8 and subjected to various kinds of signal processing, and left (L) and right (R).
Output as a channel audio signal and output terminal 9
It is led to the outside via a and 9b.

The reproduced TOC data Toc and the reproduced address data Rd are supplied to the system controller 10.
A nonvolatile RAM (random access memory) 11 is connected to the system controller 10. Further, a music selection operation section 12 is provided in association with the system control section 10, and in the music selection operation section 12, an operation of designating a music number of an arbitrary music piece to be played among a plurality of music pieces recorded on the disc 1 is performed. Is performed by the user. The designated music number data is sent to the system control unit 10.

In the system control unit 10, when the reproduced TOC data Toc is supplied from the decoder 7, a process of storing the reproduced TOC data Toc in the RAM 11 at a predetermined timing is performed. Then, the system control unit 10 sends a control signal Cc for controlling the reading position of the optical head 3 to the reading position control unit 6 and a motor control signal Cs for controlling the rotation of the spindle motor 2 to the motor control unit 13. , A control signal Cm for controlling the transmission of the audio signal
Are supplied to the program information processing unit 8.

From the system controller 10 to the reading position controller 6
When the control signal Cc is supplied to the optical head 3, the reading position control section 6 outputs a drive signal C2 corresponding to the control signal Cc in order to move the reading position of the optical head 3, thereby causing the optical head 3 to read the disc 1 The forward or backward fast-forward operation in the radial direction is performed, and the drive signal C3 is output to cause the tracking control means built in the optical head 3 to perform the forward or backward track jump operation. Take control actions such as. As a result, a search operation is performed in which the optical head 3 searches for a desired track at high speed.

Further, when the motor control signal Cs is supplied from the system control unit 10, the motor control unit 13 outputs a drive signal C4 for rotating the spindle motor 2 at a rotation speed designated by the motor control signal Cs to the spindle. Supply to the motor 2. In the case of a compact disc, since the linear velocity is constant (CLV), the rotational velocity of the disc 1 is controlled in the range of about 500 to 200 [rpm] from the inner circumference to the outer circumference.

By the way, in the present invention, when the TOC data in the lead-in area is read, the rotational speed of the disk 1 and the program information in the program area are read in order to enable a quick transition to the reproduction of the program area. At a higher speed than in the case, for example, about twice the rotation speed of the innermost circumference of the program area, that is, about 100
The rotation speed is set to about 0 [rpm]. At this time, the set rotation speed is 1000 [rp
The number of rotations is not limited to m], and can be arbitrarily set as long as it is higher than the rotation speed of the innermost circumference of the program area. The control of the rotation speed of this spindle motor 2 is
The motor controller 1 is instructed by the system controller 10
3 through 3.

Next, regarding the processing procedure in the TOC reading mode for reading the TOC data in the lead-in area,
A description will be given according to the flowchart of FIG. In this example, it is assumed that the transition to the TOC reading mode is performed when the disc 1 is set to the play position (the position shown in FIG. 2) by a loading mechanism (not shown) or the like. When the disc 1 is set in the play position, the optical head 3 is moved to the lead-in area of the disc 1 (step S1), and then the optical head 3 is focused in the lead-in area (step S2). The arrival of the optical head 3 in the lead-in area can be detected by using a well-known position detector or the like that detects the moving position of the optical head 3.

Next, when the spindle motor 2 is started to be activated, the set rotational speed N1 (for example, 1000 [rp
m]) (step S3), and when the rotation speed of the spindle motor 2 reaches 1000 [rpm] (step S4), the operation shifts to the operation of reading TOC data (step S5). The read TOC data is stored in the RAM 11 via the system control unit 10 after being decoded by the decoder 7 via the read signal processing unit 4.

When the reading of the TOC data is completed, the spindle motor 2 is decelerated toward the specified rotation speed N2 at the innermost periphery of the program area (step S6), and when the rotation speed of the spindle motor 2 reaches the specified rotation speed N2. (Step S7), a series of processes in the TOC reading mode is finished.
After that, if the song to be played is not designated, the process shifts to the performance of the first music program, and if the song is designated, the designated song is searched and the program moves to the performance of the music program. ..

As described above, the rotational speed of the disk 1 when reading the TOC data is set to, for example, twice the rotational speed of the disk when reading the program information, so that the TOC data is read 150 times per second. Becomes As a result, the time required for reading TOC data is 99, which is the maximum number of recorded songs.

## EQU00002 ## 99 (tunes) .times.3 (times) / 150 (seconds / times) .apprxeq.2 (seconds). As a result, the time required to start the reproduction of the program area can be halved as compared with the conventional case.

In the above embodiment, the case where the present invention is applied to the reproduction of a compact disc has been described, but the present invention is not limited to this. For example, a video area on the outer peripheral side in which video information with digital audio is recorded. The same is applicable to a CDV disc divided into an audio area on the inner circumference side in which digital audio information is recorded, since TOC data is recorded in the lead-in area provided for each area. That is, the present invention can be applied to all discs in which TOC data related to recorded program information is recorded in the lead-in area.

[0022]

As described above, according to the present invention,
When the TOC data recorded in the lead-in area is read, the rotation speed of the disc is set to be higher than that when the program information is read.
Since C data can be read at high speed, the time required to start reproduction can be shortened.

[Brief description of drawings]

FIG. 1 is a flowchart showing a processing procedure of a TOC reading mode according to the present invention.

FIG. 2 is a block diagram showing an example of a configuration of a disc player according to the present invention.

FIG. 3 is a data structure diagram of TOC data.

[Explanation of symbols]

1 disk 2 spindle motor 3 optical head 6 reading position control unit 7 decoder 8 program information processing unit 10 system control unit 13 motor control unit

Claims (1)

[Claims] 1. In reproducing a disc in which index data related to recorded program information is recorded in a lead-in area, the program information is read as the rotational speed of the disc when the index data in the lead-in area is read. A disc player characterized by being set at a speed higher than the rotation speed of the disc at that time.