JPH07326118A - Disk replacement method - Google Patents

Abstract

PURPOSE:To prevent a soundless state and a single-color screen state from taking place for a long period of time at the time of replacing a disk, and continuously perform reproduction. CONSTITUTION:A recording period of time of a disk 14 set in a disk drive 12 is sought, and it is monitored whether the reproduction from the completion part of the record of a disk before a predetermined time is completed, and when the reproduction before a predetermined time is completed, the remaining unreproduced data is read from the disk at a high speed and stored in a memory 23 and at the same time data is read out from the memory at an usual speed for reproduction. When the storage of the unreproduced data into a memory is completed, the disk is replaced, and after the reproduction of the whole data stored in the memory 23 is completed, the reproduction of a replaced new disk is started.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc exchange method for a disc player having a disc changer, and more particularly to a state in which no image is displayed on the display screen (monochromatic screen state) or a silent state during disc exchange. The present invention relates to a disk exchange method capable of preventing such a situation and continuously outputting video and audio.

[0002]

2. Description of the Related Art There is a disc player having a disc accommodating portion for accommodating a plurality of discs, a disc drive for reading and reproducing data recorded on the disc, and a disc changer for setting a predetermined disc on the disc drive. . For example, a CD with a CD changer
It is a player. Such a CD player with a CD changer can play a plurality of discs continuously for a long time, and can mount and play any disc desired by the user based on an instruction from the operation unit. There are advantages.

[0003]

However, in the conventional CD player with a CD changer, when a disc is exchanged, it is necessary to perform a series of operations of stopping the rotation of the disc during performance, storing the old disc, mounting a new disc, and starting rotation. There is. For this reason, there is a problem that it takes a long time to exchange the disk, a silent state continues for several to several tens of seconds, and a feeling of strangeness occurs. Further, in a video CD player capable of reproducing moving images, the maximum recording time of a video CD is about 74 minutes. For this reason, most movies have a two-disc structure, and when this is viewed on a video CD player with a CD changer, the video becomes monochromatic and the sound becomes silent during the exchange of the first and second discs. . In view of the above, an object of the present invention is to provide a disc replacement method capable of preventing a silent state or a monochromatic screen state during disc replacement. Another object of the present invention is to provide a disk exchange method capable of continuously outputting video and audio during disk exchange.

[0004]

According to the present invention, the above object is to determine the recording time of a disk set in a disk drive, and whether the reproduction is completed within a predetermined time before the recording end portion of the disk. A means for monitoring and a means for reading the remaining unreproduced data at a higher speed from the disk and storing it in the memory when the reproduction up to a predetermined time is completed, and for reading and reproducing the data from the memory at a normal speed. The means for exchanging the disc upon completion of storing the unreproduced data in the memory and the means for starting reproduction of the exchanged disc after completion of reproduction of all the data stored in the memory.

[0005]

[Operation] The recording time of the disc set in the disc drive is obtained, and it is monitored whether the reproduction up to a predetermined time before the recording end portion of the disc is completed. When the reproduction up to the predetermined time is completed, the remaining time is recorded. The unreproduced data is read from the disk at a higher speed and stored in the memory, and the data is read from the memory at a normal speed and reproduced. Then, when the storage of the unreproduced data in the memory is completed, the disc is exchanged, and the reproduction of the exchanged disc is started after reading all the data stored in the memory. By doing so, it is possible to prevent a silent state or a monochrome screen state when the disc is replaced. In addition, if the exchange of the disc is completed before the reading of all the data stored in the memory is completed, the pickup is positioned at the playback start position of the new disc and put in the pause state, and the reading of all the data stored in the memory is performed. After that, the pause state is released and the disc playback is started. By doing so, it is possible to continuously output video and audio when the disc is replaced.

[0006]

【Example】

(a) Structure of Video CD A video CD that records compressed audio data and compressed image data in a CD-ROM format in a time-division manner and enables AV reproduction for up to 98 traffic has been put into practical use. FIG. 1 is a disk configuration diagram of such a video CD. LIN is a lead-in area where various TOC information is recorded, TR1
-TRN is track 1-track N, LOT is lead
It is an out area. ISO for track 1 (TR1)
File management information PVD based on 9660, karaoke information section, video CD information section,
A segment play section and a CD-I application section are provided, and MPEG1 (Movi
The high-efficiency coded (compressed) audio and image data are stored by the ng Picture Image coding Experts Group 1) method. In the video CD information section of the track 1, a variety of information, for example, a list ID offset table (LOT) for recording IDs of moving images and still images recorded on the disc, and a playback control section for recording a reproduction procedure described in a list format (PBC) etc. are to be entered.

FIG. 2 is a block diagram of the track, and FIG. 3 is a block diagram of the sector. At the head of the track, 150 sectors are provided as a pause margin and 15 sectors are provided as a front margin and a rear margin, respectively, assuming that a CD player is used to search by a track number.
It is the EG data section. As shown in FIG. 3, the sector format of MPEG data is composed of a pack header PHD and pack data PDT, and one pack is composed of 2324 bytes which is a user data area of one sector of the CD-ROM. The pack data PDT is composed of a plurality of packets, and each packet is composed of a packet header PCH and packet data PCD. In one packet,
At least one screen of compressed image data, one frame of compressed audio data, or other data is included. About 1.2 Mb / sec for image data,
Since 0.2 Mb / sec is allocated to the audio data, one audio sector appears every 5 to 6 sectors. The pack header PHD has a start code,
A reference clock (SCR: System Clock Reference), transfer rate, etc. are entered, and a start code, stream type (video / audio /
Playback time (PTS: Presentation Ti)
me Stamp), decoding start time (DTS: Decoding Time St
amp) etc. are entered.

FIG. 4 shows an example of a hierarchical structure of compressed image data, which is composed of a sequence layer, a GOP layer and a picture layer. Multiple GOP (Group Of Picture) layers (15
Pictures are recommended), and each picture has three types of I, P, and B. The I picture is an intra-frame coded image and can be independently decoded, but has the largest data amount. The P picture is an inter-frame predictive coded image, and is predictively coded based on the past I or P picture. The B picture is a picture peculiar to MPEG, and is inter-frame predictive coded bidirectionally from a past I or P picture and a future I or P picture, and has a small amount of data. The P picture is an intermediate amount of data between the I picture and the B picture.

In order to reduce the frame memory capacity on the decoder side as much as possible, the original picture order (playback order) of each picture and the recording order on the video CD are different as shown in FIG. B ₁ , B ₂ , I ₃ , B ₄ , B ₅ , P ₆ , B ₇ , B ₈ , P ₉ ,
B ₁₀ , B ₁₁ , P ₁₂ , B ₁₃ , B ₁₄ , and P ₁₅ are I ₃ , B ₁ , B ₂ , P ₆ , B ₄ , B ₅ , P ₉ , and B ₇ on the recording medium (video CD). , B ₈ ,
P ₁₂ , B ₁₀ , B ₁₁ , P ₁₅ , B ₁₃ , and B ₁₄ , which are reproduced in the same order as the original picture at the time of reproduction. P ₆
The picture is decoded using the I ₃ picture after decoding, and P ₉
The picture is decoded using the P ₆ picture after decoding.
The B ₁ picture is decoded using an I ₃ picture after decoding, a P ₁₅ picture after decoding in the immediately preceding GOP, and an interpolation picture based on these. B ₄ picture is I ₃ after decoding
It is decoded using a picture, a P ₆ picture, and an interpolated picture based on these pictures.

A video sequence layer is composed of one or more GOPs having the same image size, screen aspect ratio, etc. The GOP layer is composed of 15 picture layers divided for each picture. In the header of the sequence layer, after the sequence start code, the characteristics of the compressed image data required for decoding such as image size and aspect ratio of the image are recorded.
The GOP start code and other data are recorded in the header of the GOP layer, and the PTS, DTS, picture type, etc. are recorded together with the picture start code in the header portion of the picture layer. The compressed image data and the compressed audio data are individually packetized, and then the packet of the compressed image data and the packet of the compressed audio data are combined and packed into a fixed amount of data and recorded on the video CD.

(B) Configuration diagram of video CD player FIG. 6 is a configuration diagram of a video CD player according to the present invention. Reference numeral 11 is a disk housing portion for housing a plurality of disks on which MPEG data is recorded, 12 is a disk drive for reading the data recorded on the disk, and 13 is a predetermined disk taken out from the disk housing portion and mounted in the disk drive 12. The disc changer 14 is a video CD. Reference numeral 15 denotes an RF / servo circuit, which amplifies the RF signal read from the video CD and inputs it to the CD signal processor in the subsequent stage, and also performs various servo controls (focusing servo, tracking servo, feed servo, constant linear velocity control). . Reference numeral 16 is a C that demodulates the CD format data from the RF signal and executes digital signal processing including error detection and correction processing.
The D signal processor 17 is a CD-ROM signal processor that demodulates MPEG data in the CD-ROM format and performs digital processing such as error detection and correction processing and extraction of address information (time information). Reference numeral 18 is an SRAM, 19 is a microcomputer (system controller) for controlling the entire system, 20 is an external interface section connected to the CD changer 13, 21 is an operation section, and has a key section 21a and a display section 21b. The microcomputer 18 receives the TOC information of the video CD and the current position (address information, time information) of the pick-up, and executes the disc exchange control of the present invention described later.

Reference numeral 22 is an MPE for controlling separation of MPEG data and writing / reading of MPEG data to / from a memory.
The G data handle controller 23 is a memory for storing MPEG data when the disc is replaced. The controller 22 is normally MPEG (when the disc is not replaced).
Of the data, compressed image data is output to the video side and compressed audio data is output to the audio side. When the disk is exchanged, MPEG data is written to the memory 23 at high speed and read from the memory 23 at normal speed to be appropriately video side. , Output to the audio side. 24 is an MPEG video decoder which receives compressed image data and decodes the image according to the MPEG1 system, 25 is a DRAM used for decoding the image data, and 26 is MPEG which receives compressed audio data and decodes the audio data according to the MPEG1 system. An audio decoder, 27 is a DRAM used for decoding audio data, 28 is a DA converter for DA converting image data, and 29 is a DA converter for DA converting audio data.

(C) Disk Swap Control FIGS. 7 and 8 are flowcharts of the disk swap control of the present invention. When the play key on the key portion 21a is operated (step 101), the microcomputer 19 instructs the disc changer 13 to set the first video CD in the CD drive 12. As a result, the disc changer 13 mounts the first video CD in the disc drive (step 102). Then, the microcomputer 19 reads the TOC information of the video CD and receives the TOC information from the CD-ROM signal processor 17. Then, by referring to the TOC information, recording time of the video CD that is mounted T _R and N single set of what-th video CD
Is determined (step 103). Then, the reproduction of the video CD is started (step 104).

In parallel with the reproduction, it is checked whether or not there is a video CD following the current video CD (step 105). If not, the processes of steps 104 to 106 are repeated until the reproduction is completed. On the other hand, if subsequent disk exists, CD-ROM signal processor 17 the current playback address received from (current time information) T and Duration using T _R and the disk exchange time Tc following formula (T _R -T) It is checked whether ≦ 2 · Tc holds (step 107). If not established, the processing from step 104 is repeated until the above equation is established.

If the above equation is satisfied, the linear rotational speed of the CD drive is doubled, and the data reading speed from the video CD 14 is doubled to the normal reading speed (step 10).
8). The CD-ROM signal processor 17 demodulates the data read from the video CD at double speed into MPEG data, performs error detection and correction processing, and inputs the data to the controller 22. The controller 22 writes the MPEG data in the memory 23 at a double speed, and at the same time, the FIFO (Firs
MPEG data is read from the memory 23 at a normal speed according to the "t in first out" method (step 109). In this case, the controller 22 separates the MPEG data into compressed image data and compressed audio data, inputs the compressed image data into the MPEG video decoder 24, and inputs the compressed audio data into the MPEG audio decoder 26. After that, the MPEG data of 2.Tc is video C
Check if it is read from D (step 110),
Double speed reading is continued until it is read.

When the double speed reading is completed, the microcomputer 19
Instructs the disc changer 13 to exchange the disc (step 111). As a result, the disk change operation by the disk changer 13 and the MP from the memory 23 are performed.
Normal speed reading of EG data is performed in parallel (step 112). It is checked whether the memory 23 is empty (empty) (step 113), and if it is not empty, in other words, if the data reproduction of the disc before the exchange is not completed, the exchange of the video CD is completed. Check (step 114). If the exchange of the CD has not been completed, the processing from step 112 onward is repeated. The exchange of the video CD is completed before the memory becomes empty.

When the exchange of the video CD is completed in step 114, the TOC information is read, and then the pick-up is positioned at the reproduction start position of the new video CD and the pause state is set (step 115). After that, the processing from step 112 onward is repeated until the memory becomes empty. When the memory becomes empty due to the normal speed reading, the pause state is released by the generation of the vertical and horizontal synchronizing signals, and the reproduction of the new video CD is started (step 104).
The subsequent processing is repeated. In this way, there is no disturbance in the vertical synchronization of the video, and it is possible to replace the disk while maintaining the continuity of the video and audio accurately without making the viewer aware of when the disk was switched.

(D) Modification Since the disk exchange is a mechanical operation, the disk exchange time is not always the same every time. So MPEG
Normally, the amount of data stored in the memory 23 is set to be slightly larger than the amount corresponding to the disc exchange time Tc so that it can be dealt with when the disc exchange time is long. Further, when the memory becomes empty before the disc is exchanged, the final image is displayed as a still image.
The case where the present invention is applied to the video CD player has been described above, but the present invention can be applied to an audio CD player and other players. Although the present invention has been described above with reference to the embodiments, the present invention can be variously modified according to the gist of the present invention described in the claims, and the present invention does not exclude these.

[0019]

As described above, according to the present invention, when the reproduction is completed up to a predetermined time before the recording end portion of the disc, the remaining unreproduced data is read out faster than the disc and stored in the memory. Data is read from the memory at a speed and reproduced, and when the storage of the unreproduced data is completed in the memory, the disc is exchanged, and after the reproduction of all the data stored in the memory is completed, the reproduction of the exchanged disc is started. With this configuration, it is possible to prevent a silent state or a monochromatic screen state for a long time when the disc is replaced. Further, according to the present invention, when the exchange of the disk is completed before the reproduction of all the data stored in the memory is completed, the pickup is positioned at the reproduction start position of the new disk to be in the pause state and stored in the memory. Since the pause state is released when the reproduction of all data is completed and the reproduction of the disc is started, video and audio can be continuously output when the disc is exchanged.

[Brief description of drawings]

FIG. 1 is a disk configuration diagram of a video CD.

FIG. 2 is a configuration diagram of a truck.

FIG. 3 is a configuration diagram of a sector.

FIG. 4 is an explanatory diagram of a hierarchical structure of MPEG video data.

FIG. 5 is an explanatory diagram of a recording position on a medium of a picture forming a GPO.

FIG. 6 is a block diagram of a video CD player of the present invention.

FIG. 7 is a processing flow (part 1) of disk exchange control.

FIG. 8 is a processing flow (part 2) of disk exchange control.

[Explanation of symbols]

 11-Disc housing 12-CD drive 13-Disc changer 16-CD signal processor 17-CD-ROM signal processor 19-Microcomputer (system controller) 22-MPEG data handle controller 24-MPEG video Decoder 26 ··· MPEG audio decoder

Claims (2)

[Claims] 1. A disc including a disc storage portion for storing a plurality of discs, a disc drive for reading and reproducing data recorded on the mounted discs, and a disc changer for setting a predetermined disc in the disc drive. In the disc exchange method of the player, the recording time of the disc set in the disc drive is calculated, and it is monitored whether the reproduction is completed up to a predetermined time before the recording end portion of the disc, and the reproduction up to the predetermined time is completed. In this case, the remaining unreproduced data is read out faster than the disc and stored in the memory, at the same time the data is read out from the memory and reproduced, and the disc is exchanged when the storage of the unreproduced data is completed. Of the disc that was exchanged after all the data stored in the memory was played. Disk exchange method which is characterized in that to start the raw. 2. When the exchange of the disc is completed, the pickup is positioned at the reproduction start position to be in the pause state, and after the reading of all the data stored in the memory, the pause state is released to start the reproduction of the disc. Claim 1
Disc replacement method described.