JPH01256090A - Optical disk reproducer - Google Patents

Abstract

PURPOSE:To attain high speed access by moving directly a pickup based on access information of an optical disk read in advance so as to apply access. CONSTITUTION:Access information storage device 1a able to store access information of all optical disks to be loaded, access information read means 2 reading sequentially the access information from optical disks CD-A-Z into the access information storage device 1a and an access means 1 accessing each information of the optical disks CD-A-Z to be designated based on the stored access information are provided. When the accessed information is bridged over between disks, it is not required to read the access information of new optical disks. Thus, the waiting time transited to a different optical disk is reduced.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides, for example, a plurality of CDs [compact d
This invention relates to an optical disc playback device such as a CD player that can be equipped with a CD player or the like.

[Conventional technology]

As shown in FIG. 3, the CDII has a TOC [table
of contents] area 13 is provided. The TOC area 13 is an area in which a lead-in signal (access information) indicating information such as the number of songs, index, playback time, etc. regarding the music recorded in the program area 12 is recorded. Then, the CD player first moves the pink-up to the innermost circumference of the CDII, and then
By reading the lead-in signal of area 13 into the RAM, the designated song can be directly accessed based on this.

Furthermore, some CD players can be loaded with a plurality of CDIIs at the same time.

Conventional CD players like this one, even if the selected songs are selected randomly, if the specified songs are on the same disc,
As in the case of a CD player in which only one CD 11 is loaded, sequential access can be performed based on the lead-in signal that is first read into the RAM.

[Problem to be solved by the invention]

However, if the specified song spans different discs, the TOC of the innermost circumference of the new CDII will be updated.
Move the pickup to area 13, read the lead-in signal into RAM, and based on this, select the CDII
had to be accessed.

Therefore, in conventional CD players, when songs span between discs, not only does the waiting time between the songs become longer, but the waiting time between the songs is longer or shorter than when playing between the same discs. There was a problem that a difference occurred.

For example, if the waiting time between songs becomes long, listeners will feel irritated. Furthermore, when songs are played one after another through random selection or the like, if there is a difference in the length of the waiting time between each song, there is a risk that the listener will feel uncomfortable and the atmosphere of the music awards will be disrupted.

[Means to solve the problem]

In order to solve the above problems, an optical disc reproducing apparatus according to the present invention is an optical disc reproducing apparatus capable of mounting a plurality of optical discs each having access information for accessing each piece of information on the disc. an access information storage device capable of storing access information of all optical disks that have been accessed; an access information reading means for sequentially reading access information from each optical disk into the access information storage device; and each optical disk stored in the access information storage device. and access means for accessing each piece of information on each designated optical disc based on the access information.

[For production]

The access information includes time information, track information, sector information, etc. for directly accessing (random access) each information on the disk in a pink-up manner. In the case of a CD, the lead-in signal corresponds to eight times this access information.

The access information storage device must be able to be accessed faster than an optical disk as a storage device, and a semiconductor storage device is usually used. In conventional CD players, the RAM serving as the access information storage device has a capacity only for one CD.

The access information reading means moves each of the optical disks loaded to a predetermined area, reads each piece of access information, and stores the read information in the access information storage device. This process is performed in advance at an appropriate time before each piece of information is accessed. In the case of a CD, a lead-in signal as access information is recorded in the innermost TOC area, so it is necessary to move the pickup to this position.

The access means uses access information stored in the access information storage device when accessing information specified by an operation input or a program. In other words, even if the information to be accessed next is recorded on a different optical disc, the pickup can be moved directly from the current position to the recording position of that information on that optical disc based on the access information of that optical disc that has been read in advance. access.

Therefore, in the optical disc reproducing apparatus of the present invention, when the information to be accessed spans between discs, there is no need to read access information for a new optical disc each time.

〔Example〕

An embodiment of the present invention will be described below based on FIGS. 1 and 2.

This embodiment shows a CD player that can simultaneously load a plurality of CDs.

This CD player is controlled by a microcomputer l. Also, R in this microcomputer 1
AM1a (access information storage device) has an area capable of storing lead-in signals (access information) of all loaded CD-A-Z.

Information recorded on CD-A-Z is read by Pinkup 2. The output of the pickup 2 is connected to the microcomputer 1 via a signal processing circuit 3. Further, this pickup 2 is moved by a slide motor 4 to the recording areas of all CD-A-Z. This slide motor 4 is connected to the microcomputer 1 via a driver 5.

The microcomputer 1 is connected to the outputs of the innermost position detectors 6 of each CD-A-Z. The innermost circumferential position detector 6 is provided at each mounting position of each CD-A-Z,
It is detected that the pickup 2 has reached the innermost position on each of these CD-A-Z.

Actually, this microcomputer 1 is connected to operation keys 7 and a display device 8. The microcomputer 1 performs control based on input from the operation keys 7 according to a program stored in the internal ROM, and causes the display device 8 to display a predetermined display.

The control operation of the CD player having the above configuration will be explained based on the flowchart shown in FIG.

First, in step (hereinafter referred to as "S") 1, it is determined whether or not to play a plurality of CDs. Whether or not to play multiple CDs is determined by input by the user through the operation keys 70.

If it is determined that only one CD is to be played, rather than a plurality of CDs, the operation will be the same as the conventional one. In this case, first determine whether to perform random song selection (S
2). Whether random music selection is to be performed or not is determined by the user's input using the operation keys 7. When performing random music selection, an input from the operation key 7 is accepted and a music piece to be played is designated (S3). By inputting the selected song numbers using the operation keys 7, the user specifies the songs to be played in that order. Once you have specified the song to play, select the C to play.
D is initialized (S4). If it is determined in S2 that continuous playback is to be performed instead of random music selection, the process immediately moves to S4. To initialize a CD, first, the slide motor 4 is driven via the driver 5, and the pickup 2 is moved toward the innermost position of the CD. Next, when the innermost position detector 6 of the CD emits a signal and the pink-up 2 reaches the innermost position, the control of the slide motor 4 is changed to playback mode.
The pickup 2 and the signal processing circuit 3 reproduce the signal recorded in the TOC area at the innermost position.

Then, the lead-in signal thus reproduced is taken into the microcomputer 1 and stored in the RAM 1a, thereby completing the initialization. When initialization is completed, the specified songs will be played in order in the case of random selection, or the CD will be played in the case of continuous play.
The 1st to 24th songs are sequentially played back (S5). At this time, the currently played song and its elapsed time are sequentially displayed on the display device 8. When all the designated songs have been played, or when the last song has been played, the playback process ends and the process returns to the initial state.

Further, even when it is determined in Sl that a plurality of CDs A to Z are to be played, it is first determined whether or not to perform random music selection (S6). When performing random music selection, the input from the operation keys 7 is accepted and the music to be played is specified in the same manner as described above (S7). However, in this case, for each played song, the CD-A on which that song was recorded
It is also necessary to specify orZ at the same time. When the designation of the music to be played is completed, each CD-A-Z is initialized (S8). If it is determined in S6 that continuous playback is to be performed instead of random music selection, the process immediately moves to S8. To initialize each CD-A to CD-Z, first, the slide motor 4 is driven via the driver 5, and the pink-up 2 is moved to the innermost position of the first CD-A. The innermost position detector 6 of the CD-A issues a signal, and when the pickup 2 reaches the innermost position, the control of the slide motor 4 is changed to playback mode, and the pickup 2 and signal processing circuit 3 start reading. It reproduces the input signal and also imports it into the microcomputer l and stores it in the RAM1a.
41. After the initialization of CD-A is completed in this manner, CD-B is subsequently initialized in the same manner. Then, after completing the initialization of the last CD-Z by repeating the same process one after another, all CD-Z
- Initialization of A to Z is completed. When the initialization is completed, in the case of random music selection, the designated songs are played in order (S9). However, when starting playback of each designated song, each CD stored in RAM1a
- A-Z glue - Pink up 2 based on the doin signal
directly to a predetermined position on that CD-AorZ.

This eliminates the need to initialize each time the previous song and the next song span between CDs, unlike in the past, so whether the previous song and the next song are on the same CD or on different CDs.
There will no longer be a difference in waiting time depending on where the location is. In the case of continuous reproduction, the first song on CD-A to the last song on CD-Z are played in order (S9). In this case as well, since each CD-A-Z lead-in signal stored in the RAM 1a is used, there is no need to read the lead-in signal each time the CD is moved from the previous CD to the next CD. However, in this case, since the pickup 2 must be moved once to the innermost position of each CD-AorZ, there is little merit in saving this moving time. Note that during this reproduction, the currently reproduced song and its elapsed time are sequentially displayed on the display device 8, as described above. Playback of all specified songs is completed, or CD-Z
When the playback of the last song is completed, the playback process is ended and the state returns to the initial state.

Note that the process of S8 above corresponds to the "access information reading means" which is a component of the present invention. Further, the process of S9 above corresponds to the "access means" which is a component of the present invention.

〔Effect of the invention〕

As described above, the optical disc playback device according to the present invention is an optical disc playback device that can mount a plurality of optical discs each having access information for accessing each piece of information on the disc. an access information storage device capable of storing access information of each optical disk; an access information reading means for sequentially reading access information from each optical disk into the access information storage device; and an access information storage device capable of storing access information of each optical disk stored in the access information recording device and access means for accessing each piece of information on each designated optical disc based on the information.

As a result, even if the information to be accessed spans between discs, there is no need to read access information for a new optical disc each time.

Therefore, in the present invention, when accessing information one after another,
This has the effect of shortening the waiting time when moving to a different optical disc. Furthermore, this also eliminates the difference in waiting time when accessing information within the same disk, and provides the effect that access to each piece of information becomes smoother.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, in which FIG. 1 is a flowchart showing the operation of a CD player, and FIG. 2 is a block diagram showing the control mechanism of the CD player. FIG. 3 is a bottom view of the CD. 1 is a microcomputer, 1a is a RAM (access information storage device), 2 is a pickup, 4 is a slide motor, and 8 to Z are CDs (optical discs). Figure 1 Figure 2

Claims (1)

[Claims] 1. In an optical disc playback device that can mount a plurality of optical discs each recording access information for accessing each piece of information on the disc, an access system that can store the access information of all the loaded optical discs. an information storage device; an access information reading means for sequentially reading access information from each optical disk into the access information storage device; 1. An optical disc playback device comprising: access means for accessing information.