JP2882940B2 - Optical disc information reproducing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk information reproducing method, and more particularly, to an optical disk capable of continuously reproducing only music data and audio data from an optical disk in which ROM data and music data and audio data are mixed. It relates to an information reproducing method.

[0002]

2. Description of the Related Art FIG. 1 shows the configuration of an apparatus for executing a conventional optical disk information reproducing method. In the figure, 1 is a disk mounted on a disk holder 2 and 4 is a disk 1
A spindle motor for rotating the motor, a drive circuit for the spindle motor, and 5 an optical pickup;
The purpose is to irradiate pits recorded on the disk 1 with laser light, detect the intensity of the reflected light, and read out the recorded signal. Numeral 6 denotes a servo control circuit for reading the pits recorded on the disk 1 by causing the optical pickup 5 to track the tracks formed on the disk 1 and constantly focusing the laser light on the pits. This is a circuit for automatically adjusting the position of the objective lens of the optical pickup 5 with respect to the disk surface.

Reference numeral 9 denotes a digital signal processing circuit, which outputs the output of the optical pickup 5 through a preamplifier circuit, and then EFs the digital data extracted by a data strobe circuit.
A circuit that performs M demodulation, performs processing for detecting and correcting error data, and correcting uncorrectable data, and further separates a control signal from main data.

[0004] Reference numeral 10 denotes a voice control circuit. The circuit 10 includes a circuit for performing D / A conversion of the main data into analog signals of right and left channels, a sample and hold circuit for right and left channels, and a right and left circuit for cutting off unnecessary noise components other than audio signals. And a reduction pass filter for the left channel and an output amplifier circuit for the right and left channels provided with a mute function. Reference numeral 15 denotes an audio output terminal, which includes a right channel and a left channel.

Reference numeral 17 denotes a system control circuit constituted by a microcomputer, which reads necessary data such as control data from the digital signal processing circuit 9 in accordance with an instruction from a key input unit 19, and controls the servo control circuit 6 and the spindle motor. The display unit 20 is a circuit that controls the drive circuit 4 or the mechanical unit, and displays a song number, a playing time, or an operation state.

Next, the operation will be described. When a power switch (not shown) is turned on, initialization such as initialization of the memory of the system control circuit 17 and setting of the optical pickup 5 to the initial position is performed. Next, disk 1 is disk holder 2
It is determined whether or not the disc 1 is mounted, and after the disc 1 is mounted, the servo control circuit 6 is instructed to perform a focus search. As a result, the spot light emitted from the optical pickup 5 to the disk 1 converges to a predetermined diameter. When the focus search is completed, the servo control circuit 6 is instructed to start focus servo. The focus servo is for automatically adjusting the objective lens of the optical pickup 5 by moving the objective lens up and down following the surface deviation of the disk 1.

Next, a spindle kick is instructed to the spindle motor drive circuit 4, and as a result, a drive signal is given to the spindle motor to start the spindle kick. Further, it instructs the servo control circuit 6 to turn on the tracking servo. This tracking servo moves the objective lens of the optical pickup servo 5 in the radial direction so that the spot light follows the track on the disk 1. Further, it instructs the spindle motor drive circuit 4 to turn on the spindle servo. The spindle servo servo-controls the spindle motor at a speed corresponding to the radial position so as to keep the linear speed of the disk 1 constant.

When the spindle servo is started, the current track information written at the head of each block of the disk 1 is read, and the TO written at the innermost circumference of the disk 1 is read.
Information corresponding to the table of contents of the disk 1 called C (Table of Contents) is searched for and read, and stored in a memory in the system control circuit 17.

Next, a pause (pause) for a predetermined time is performed, and a command input from the key input unit 19 is waited. When a command is input from the key input unit 19, processing corresponding to the input command is performed. On the other hand, if there is no command input, the process ends. This command instructs a search operation, a play operation, or the like. When the command instructs a search operation, movement control processing of the optical pickup 5 is performed. In the movement control processing of the optical pickup 5, the target track storing the target data is confirmed by the contents of the memory in the system control circuit 17 storing the TOC according to the search command input from the key input unit 19, and based on this, Optical pickup 5
The number of tracks from the current position to the target track is calculated, and the target track is searched.

On the other hand, when the command is a command for instructing a play operation, it is determined whether or not the data read from the disk 1 is ROM data as shown in the flowchart of FIG. 2 (step S100). If the data is music data or audio data, the audio mute is turned off (step S101), and the music data or audio data read from the disk 1 is reproduced (step S1).
03).

In step S100, when the data read from the disk 1 is ROM data, the audio mute is turned on, and audio mute processing is performed on the ROM data. Therefore, the silent state continues until the next music data or audio data is read from the disk 1.

[0012]

SUMMARY OF THE INVENTION CD-ROM
There are many types in which ROM data and music data and audio data are mixed. In the conventional optical disc information reproducing method, when reproducing a CD-ROM in which ROM data and music data and audio data are mixed, the music data and audio data are intermittently reproduced after a mute period of the ROM data. There is a problem that the user has to wait in a silent state until music data or audio data is output.

The present invention has been made in view of such a conventional problem. Even when a CD-ROM in which ROM data and music data or audio data are mixed is reproduced, a portion of the ROM data is reproduced. To provide an optical disc information reproducing method capable of quickly moving a pickup to an area on a track where the next music data or audio data is stored and skipping audio data and continuously reproducing audio data or audio data. With the goal.

[0014]

An optical disk information reproducing method according to the present invention is an optical disk information reproducing method for reading and reproducing digital information recorded on an optical disk by a pickup so as to be movable in a radial direction. An information identification step for identifying ROM data or music data or audio data; and when the digital information read from the optical disc is identified as ROM data by the information identification step, audio mute is performed and the pickup is set to music data or audio. The method is characterized by comprising a pickup outer peripheral direction moving step for quickly moving to a destination area on a track where data is recorded.

[0015]

According to the present invention, there is provided an optical disc information reproducing method comprising:
The digital information read from the optical disk is identified as ROM data or music data or audio data. When the digital information read from the optical disk is identified as ROM data in the information identification step, audio mute is performed and the pickup is moved to the next position. Music data or audio data is quickly moved to the area on the track where the music data or audio data is recorded, and the music data or audio data is reproduced. There is no need to wait in a silent state until data or audio data is reproduced, and music data and audio data can be reproduced continuously.

[0016]

Next, an embodiment of an optical disk information reproducing method according to the present invention will be described with reference to FIG. The configuration of the optical disk information reproducing method for executing this embodiment is the same as the configuration of the optical disk information reproducing method shown in FIG. Hereinafter, the flowchart shown in FIG. 3 of the method of the present invention will be described with reference to FIG.

The optical disc information reproducing method in this case includes:
The program shown in the flowchart in the memory of FIG. 3 is stored in the memory in the system control circuit 17.

When a power switch (not shown) is turned on, initialization of a memory of the system control circuit 17 and initialization of the optical pickup 5 to an initial position are performed. Next, it is determined whether or not the disk 1 is mounted on the disk holder 2, and after the disk 1 is mounted, the servo control circuit 6 is instructed to perform a focus search. As a result, the spot light emitted from the optical pickup 5 to the disk 1 converges to a predetermined diameter. When the focus search is completed, the servo control circuit 6 is instructed to start focus servo. The focus servo is for automatically adjusting the objective lens of the optical pickup 5 by moving the objective lens up and down following the surface deviation of the disk 1.

Next, a spindle kick is instructed to the spindle motor drive circuit 4, and as a result, a drive signal is given to the spindle motor 4 to start the spindle kick. Further, it instructs the servo control circuit 6 to turn on the tracking servo. This tracking servo moves the objective lens of the optical pickup 5 in the radial direction so that the spot light follows the track on the disk 1. Further, it instructs the spindle motor drive circuit 4 to turn on the spindle servo. The spindle servo servo-controls the spindle motor at a speed corresponding to the radial position so as to keep the linear speed of the disk 1 constant.

When the spindle servo is started, the current track information written at the head of each block of the disk 1 is read, and the TO written at the innermost circumference of the disk 1 is read.
Information corresponding to the table of contents of the disk 1 called C (Table of Contents) is searched for and read, and stored in a memory in the system control circuit 17.

Next, the system waits for a predetermined time (pause), and waits for a command input from the key input unit 19. When a command is input from the key input unit 19, processing corresponding to the input command is performed. On the other hand, if there is no command input, the process ends. This command instructs a search operation, a play operation, or the like. When the command instructs a search operation, movement control processing of the optical pickup 5 is performed. In the movement control processing of the optical pickup 5, the target track storing the target data is confirmed by the contents of the memory in the system control circuit 17 storing the TOC according to the search command input from the key input unit 19, and based on this, Optical pickup 5
The number of tracks from the current position to the target track is calculated, and the target track is searched.

On the other hand, when the command is a command for instructing a play operation, the command is as shown in FIG. First, when play, that is, reproduction is started, the control code of the disc, that is, the subcode channel Q is read (step S1). DATA to determine if the pickup has moved to the outermost
It is checked whether the TNO in -Q is "AA" (step S2). If the pickup has moved to the outermost periphery (TNO = AA), the reproduction ends.

If it has not moved to the outermost periphery, the CD-R
It is determined whether the data is OM data. The checking method is the second bit (DATA · T) of the control part of channel Q.
If "RACK" is "1", the data is determined to be CD-ROM data, and if "0", it is determined to be audio data (step S3). If the data is audio data, the pickup is set in the track following state (step S4), the audio mute is released, and the audio is reproduced (step S5).

In step S3, if it is ROM data,
Pickup truck 1 to skip ROM data
The main body is moved in the outer peripheral direction (steps S6 and S7). After the movement, the subcode channel Q is read again (step S
8) It is determined whether the pickup has moved to the outermost periphery (step S9). If it has moved to the outermost periphery, the reproduction ends. If it has not moved to the outermost circumference, it is checked whether it is ROM data (step S10). ROM
If it is data, the process moves the pickup to the outer periphery again, that is, the process proceeds to step S6. If the data is audio data, the pickup is moved in the inner circumferential direction by one track to search for a switching position between the ROM data and the audio data (steps S11 and S12).

While following the track, the code of the subcode channel Q is read, and the process waits until the audio data starts (steps S13 and S14). If the audio data can be detected, the audio mute is released (step S15), and the process starts from reading the subcode channel Q in step S1.

At the end of playback (TNO = AA), if no audio data is described on the inserted disc, a playback addition process is executed so as not to be played back thereafter.
The reproduction ends (steps S16 and S17).

[0027]

As described above, according to the optical disk information reproducing method of the present invention, whether the digital information read from the optical disk is ROM data, music data, or audio data is recorded in the subcode channel recorded on the optical disk.
When the digital information read from the optical disc is identified as ROM data by the information identification step, audio muting is performed and the pickup is moved to music data or audio data. a result of data to play the previous music data and voice data to quickly move to the area on the track that has been recorded, the Yo of the conventional optical disc information reproduction method R
Period in which the OM data is being read, it is not necessary to wait in silence, it is possible to play music data and voice data continuously.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an optical disc information reproducing apparatus for executing an optical disc information reproducing method.

FIG. 2 is a flowchart showing an operation of a conventional optical disc information reproducing method.

FIG. 3 is a flowchart showing an operation of an optical disk information reproducing method according to an embodiment of the present invention.

[Explanation of symbols]

 1 disk 5 pickup 6 servo control circuit 17 system control circuit

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) G11B 19/02 501 G11B 7/00

Claims (1)

(57) [Claims] An optical disk information reproducing method for reading and reproducing digital information recorded on an optical disk in a radially movable manner by a big-up method, wherein whether the digital information read from the optical disk is ROM data, music data or audio data is identified. When the digital information read from the optical disc is identified as ROM data by the information identifying step, audio muting is performed, and the pickup is moved to the previous area on the track where music data and audio data are recorded. An optical disc information reproducing method, comprising: a step of moving the pickup in the outer peripheral direction in which the optical disc is moved quickly.