JP3561924B2 - Disc playback device - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a reproducing apparatus with a disk changer for storing a plurality of disks and selecting and reproducing one of the disks.
[0002]
[Prior art]
2. Description of the Related Art As a compact disk (CD) player, there is a so-called continuous disk player in which a plurality of disks can be set and one of the disks can be selected and reproduced. In such a continuous-disc disk player, it is convenient to use what kind of discs are stored in the disc changer in what order. That is, it is highly desirable for the user to introduce the title, genre, and artist of the disc stored in the disc changer by a simple operation. In a player that can reproduce only one disc, a technique of reproducing an introductory portion for each music in the disc is already known. However, there has not been known a disc player capable of determining the contents of a disc stored in a continuous disc player.
[0003]
[Problems to be solved by the invention]
As described above, conventionally, there is no continuous-disc disc player capable of determining the contents of a stored disc.
The present invention has been made in view of the above points, and has as its object to provide a disk reproducing apparatus with a disk changer capable of discriminating the contents of a stored disk in a short time.
[0004]
[Means for Solving the Problems]
A disc reproducing apparatus according to the present invention includes a disc changer in which a plurality of discs having a lead-in area on an inner periphery thereof and a program area outside thereof are housed to enable disc switching, and an optional disc changer in the disc changer. A disc control unit for selecting one disc and reproducing the disc; and a disc scan control unit for sequentially selecting a plurality of discs in the disc changer and reproducing only a part of each disc one after another. The scan control means moves the optical pickup in the inner circumferential direction of the disk, and when the innermost circumference is detected, without reading the lead-in area, moves the optical pickup in the outer circumferential direction to a position corresponding to the vicinity of the beginning of the first song of the disk. , And the disc is reproduced from the position. It is desirable that the movement of the optical pickup in the disk scan control means be performed using the load time of the disk. In addition, it is desirable that the reproduction of the disk by the disk scan control means be performed at a higher speed than the normal reproduction in order to shorten the time of the intro reproduction.
[0005]
[Action]
According to the present invention, by selecting the disk scan mode, it is possible to quickly know what and where the disk is stored in the disk changer, and to obtain a user-friendly continuous disk player.
[0006]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a continuous play CD player system according to one embodiment of the present invention. The disc changer 1 stores a plurality of discs 111, 112, and 11N, and can select one of them. The pickup section includes an optical head 2, a spindle motor 3 for driving the optical head 2, a thread 4, a thread feed motor 5, and the like. The output control circuit 6 is for keeping the laser light output of the optical head 2 constant.
The control of the optical pickup unit is performed by a spindle servo circuit 8, a focus and tracking servo circuit 9, a thread drive circuit 10, and the like.
[0007]
The output of the optical head 2 is amplified by the RF amplifier 7 and sent to the demodulator 13. The output of the RF amplifier 7 is also sent to the RF PLL circuit 12, where the clock is recovered from the channel bit data, and the demodulator 13 uses this read clock to detect a synchronization pattern, reverse EFM code conversion, and subcode separation. Etc. are performed.
The frame format of the CD is as shown in FIG. 3, and there is one byte of additional information called a subcode as shown in the figure, and each bit thereof is processed as P, Q, R,. It has become. Among these, the Q code describes information such as time information, presence / absence of emphasis, and data type (music or other data). The Q code separated by the demodulator 13 is sent to a CPU 19 that performs system control.
[0008]
The voice data and redundant bit data obtained from the demodulator 13 are sent to a RAM / ECC control circuit 14 for detecting, correcting, and interpolating error data, absorbing jitter, and deinterleaving between the RAM 15 and the ECC circuit 16. Is made. The obtained audio data is sent to a D / A converter 17 and converted into analog data. The audio circuit 18 performs filtering and muting to output an audio signal.
The switch panel 20 has switches (keys) for sending various control signals to the CPU 19, and one of them is an intro scan key 21 for selecting a disk scan mode.
[0009]
In such a configuration, when the intro scan key 21 is pressed, each disk in the disk changer 1 is sequentially selected and an intro scan is performed. The specific control operation at that time will be described next with reference to the flow of FIG.
When the intro scan key 21 is pressed and detected (S1), the disk number n is reset (S2), and then the disk number 1 is set (S3). When it is detected that a disk is set on the first tray (S4), the first disk is selected from the disk changer 1 and loading is started (S5).
[0010]
Using the loading time of the disk, the optical pickup is moved in the inner circumferential direction (S6). When the innermost circumference is detected and the limit switch is detected (S7), the pickup is moved in the outer circumferential direction for a predetermined time (S8). . As shown in FIG. 4, the disc has a lead-in area in which TOC information is recorded on an inner peripheral portion, and a program area outside the lead-in area. In this embodiment, for example, the pickup is moved to the vicinity of the head of the first music piece beyond the lead-in area. However, since it is rare that a music signal is actually input from 0 minute 0 second of the first song, a few seconds after the head is appropriate.
[0011]
Then, the disk motor is rotated (S9), focus control (S10), tracking control (S11) are performed, and if the Q code in the subcode is correctly read (S12, S13), after waiting for the interleave time (S14), A sound is output (S15). The reproduction time at this time is, for example, several seconds. Note that the interleave time is a time until data dispersed by error correction by CIRC can be normally decoded.
In addition, intro reproduction at this time is preferably faster than normal reproduction, for example, double speed reproduction. By reproducing at double speed, many phrases can be heard in a short time, so that the disc determination time can be reduced. However, it is sometimes difficult to discriminate the disk when the user is not familiar with the disk, and it is desirable to set an appropriate reproduction speed in consideration of this.
[0012]
If keys such as play, pause, and stop are pressed during the intro reproduction (S16), the TOC is read (S19), and operations such as play, pause, and stop are performed (S20).
If a key such as play, pause, stop or the like is not pressed, it is determined whether a predetermined time has elapsed (S17), and whether or not n has reached the number N of disks is determined (S18). Moves to the next disk 2. Then, the pickup is moved to the vicinity of the beginning of the first music piece by using the time required for loading the disc 2, and intro reproduction is performed in the same manner as described above.
Hereinafter, the same operation is repeated. When the disc key is pressed during intro reproduction, the disc is moved to the disc, the TOC information is read, and normal reproduction is performed.
[0013]
【The invention's effect】
As described above, according to the present invention, by selecting the disk scan mode, it is possible to quickly understand what and where the disk is stored in the disk changer, and to obtain a user-friendly continuous disk reproducing apparatus.
[Brief description of the drawings]
FIG. 1 is a diagram showing a system configuration of a CD player according to an embodiment of the present invention.
FIG. 2 is an operation flow in an intro scan mode of the embodiment.
FIG. 3 is a diagram showing a frame structure of a CD.
FIG. 4 is a diagram showing a state of data recording in a CD.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Disc changer, 111, 112, ..., 11N ... Disk, 2 ... Optical head, 3 ... Spindle motor, 4 ... Thread, 5 ... Thread feed motor, 6 ... Optical output control circuit, 7 ... RF amplifier, 8 ... Spindle Servo circuit, 9 focus / tracking servo circuit, 10 thread drive circuit, 12 PLL circuit, 13 demodulator, 14 RAM / ECC control circuit, 15 RAM, 16 ECC circuit, 17 D / A converter , 18 audio circuit, 19 CPU, 20 switch panel, 21 intro scan key.

Claims (3)

A disc changer that has a lead-in area on the inner periphery and a plurality of discs with a program area on the outside to accommodate the discs and enable disc switching;
Playback control means for selecting and playing any one of the discs in the disc changer;
Disk scan control means for sequentially selecting a plurality of disks in the disk changer and sequentially playing back only a part of each disk,
The disk scan control means moves the optical pickup in the inner circumferential direction of the disk, and when the innermost circumference is detected, the optical pickup corresponds to the vicinity of the beginning of the first song of the disk in the outer circumferential direction without reading the lead-in area. A disc reproducing apparatus, wherein the disc reproducing apparatus is moved to a position where the disc is to be reproduced and the disc is reproduced from the position. 2. The disk reproducing apparatus according to claim 1, wherein the movement of the optical pickup in the disk scan control means is performed using a load time of the disk. 3. The disk reproducing apparatus according to claim 1, wherein reproduction of the disk by said disk scan control means is performed at a higher speed than normal reproduction.

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