JPH0294190A - Compact disk reproducing method, compact disk, and compact disk reproducing device - Google Patents

Abstract

PURPOSE:To make reproducing sections indicated by sectional information recorded in the sub-code of a lead-in area changeable at every track by successively reproducing the sections indicated by the sectional information in order in accordance with the sectional information. CONSTITUTION:A compact disk (CD) 1 is provided with a lead-in area 2, program area 3 where acoustic information is recorded, and lead-out area 4 indicating the terminating end of the disk 1. Then two kinds of time codes indicating arbitrary sections in the program area 3 are recorded in the sub-code of the lead-in area 2 as sectional information and a reproducing device successively reproduces sections indicated by the sectional information in accordance with the sectional information recorded in the sub-code of the area 2. Therefore, the reproducing section of each track can be changed in accordance with the content of pieces of music recorded on each track.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a compact disc for recording and reproducing music, a method for reproducing the same, and a reproducing apparatus for the same.

BACKGROUND OF THE INVENTION In recent years, optical discs for recording video and music, such as compact discs and laser discs, have become more popular, and along with improvements in quality, demands for more advanced usage are increasing.

In addition to normal playback, there are various special playback methods for playing compact discs (hereinafter abbreviated as CD), and one of them is music scan playback. An example of the above-mentioned CD music scan playback method will be described below with reference to the drawings.

FIG. 5 is a sectional view of a conventional CD. In Figure 5, 4
1 is a CD, 4 is a lead-in area, 43 is a program area in which audio information is recorded, and 44 is a lead-out area indicating the end of the disc. FIG. 6(a) is a diagram showing the TOC recorded in the subcode Q channel area of the lead-in area of a conventional CD. In FIG. 6(a),
51 is POINT.

52 is the relative time within the track, 53 is PMIN, 5
There are 4 PSEC155 PFRAMEs. Figure 6 (b
) is a diagram showing the relationship between POINT, PMIN, PSEC, and PFRAME, and FIG. 7 is a diagram schematically showing the program area of a CD. In FIG. 63 is the position T seconds from the beginning of the 21st track. 64 is the position T seconds from the beginning of the second track. 65 is the beginning position of the last track. 66 is T seconds from the beginning of the last track. It is the second position.

The music scan playback operation for a CD configured as follows will be described below.

The subcode Q channel area of the lead-in area 42 of the CD 41 contains the track number and first time code recorded on the CD 41, the first and last track numbers recorded on the CI) 41, and the lead-out area. A TOC indicating the leading time code, etc. is recorded. As shown in Figure 6(b), when POINT51 is AO, P
MIN53 indicates the first track number, POINT5
When 1 is A1, PoldN53 indicates the final track number. When POINT51 is A2, PMIN53, PSEC
54 and PFRAME55 indicate the time code at the beginning of the lead-out area, and when POINT51 is 01 to 99, PMIN53, PSEC54, and PFRAME55 indicate the time code of the beginning of the lead-out area.
Indicates the time code at the beginning of the track indicated by INT51.

The player first reproduces the lead-in area 42, reads the TOC information recorded in the subcode channel, and obtains arrangement information such as the start address of each track. In the case of music scan playback, the first TOC recorded in the program area 42 of the CD 41 is
The top position 61 of the track is searched and the track is played for T seconds from that position. When the position 62 of T seconds from the beginning of the first trunk is detected, playback ends, and the beginning position 63 of the second track is detected.
Search for. From that position, T from the beginning of the second track
Playback begins at second position 64. Thereafter, the same operation is performed for each track until the reproduction of position 66, which is T seconds from the beginning of the last track, is completed. This music scan playback is mainly used to get an overview of the contents recorded on the disc.

(For example, "Wireless and Experimental Special Edition Digital Audio CD Mastering Techniques JP+4l-PI44") Problems that the Invention Tried to Solve However, with the above conventional configuration, when performing music scan playback, each track recorded on the CD Because the playback section is a fixed period of time from the beginning of the song, regardless of the content of the song on the track, 11
If the first hit is repeated, there is a problem that the prelude is not played or it is interrupted in the middle of the phrase, and it is not always possible to get a sufficient overview of the contents recorded on the disc.

In view of the above-mentioned problems, the present invention provides a compact disc, a method for reproducing the same, and a reproducing apparatus for the same, in which the playback section is variable for each track according to the content of the music recorded on each track.

Means for Solving the Problems In order to solve the above problems, the compact disc of the present invention records two types of time codes representing arbitrary sections in the program area as section information in the subcode of the lead-in area, and The reproducing apparatus of the present invention is configured to sequentially reproduce sections specified by section information according to section information recorded in subcodes of a lead-in area.

Effects of the Invention The present invention provides a compact disc, a method for reproducing the same, and a reproducing apparatus for the compact disc, in which the playback section can be varied for each track according to the content of the music recorded on each track.

EXAMPLE Hereinafter, a CD according to an example of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a CD according to an embodiment of the present invention. In FIG. 1, 1 is the CD of this embodiment, 2 is a lead-in area, 3 is a program area where audio information is recorded, and 4 is a lead-out area indicating the end of the disc.

FIG. 2 is a diagram showing the subcode length channel area of the lead-in area of the CD of this embodiment. In Figure 2, 1
1 is a track number, 12 is a time code indicating the playback start position, and 13 is a time code indicating the playback end position.

FIG. 3 is a diagram schematically showing the program area of the CD of this embodiment. In FIG. 3, 21 is the playback start position of the first track, 22 is the playback end position of the first track, and 23 is the second track playback start position. 24 is the playback start position of the trunk, 24 is the playback end position of the second track, 25 is the playback start position of the last track, 26
is the playback end position of the last track.

FIG. 4 is a block diagram of the CD reproducing apparatus of this embodiment. In FIG. 4, 32 is a pickup, 33 is an EFM demodulator, 34 is a CIRC decoder, 35 is a microcomputer, 36 is a spindle motor, and 37 is a servo circuit. , 38 is a D/A converter, and 39 is an audio output terminal.

Regarding the CD configured as above, Figures 1 and 2 are shown below.
The detailed operation will be explained with reference to FIG. 3, FIG. 4, and FIG.

As shown in FIG. 2, the CD of this embodiment has a music scan 11 in the subcode R channel of the lead-in area (time code 12 indicating the playback start position indicating the playback section to be played in advance and time code 12 indicating the playback end position). Codes 13 are recorded in the order of minutes, seconds, and frames in correspondence with track numbers 11, respectively.

This playback section may indicate anything such as the introductory part of each track, one phrase of a song, or the main theme of the song.

When the CDI of this embodiment is inserted, the playback device (hereinafter abbreviated as player) of this embodiment plays back the lead-in area 2 of the CDI, and the signal read by the pickup 32 is sent to the EFM demodulator 33 and the CIRC decoder. 34, and from the decoded signals, the microcomputer 35 reads the TOC information recorded in the subcode rotary channel and obtains arrangement information such as the start address of each track. At the same time, the track number 11 of each track recorded in the subcode R channel, the time code 12 indicating the playback start position, and the time code 13 indicating the playback end position are read.

When the player of this embodiment performs music scan playback of the CDI of this embodiment, the microcomputer 35 controls the servo control based on the obtained time code 12 indicating the playback start position and time code 13 indicating the playback end position of each track. circuit 37
is controlled to search for the playback start position 21 of the first track recorded in the program area 3 of CI]1, and playback is performed from that position to the IIJ raw end position 22 of the first track.

The signal read by the pickup 32 is sent to the EFM demodulator 3
3. They are each decoded by the CIRC decoder 34, and the decoded signals are outputted from the audio output terminal 39 via the D/A converter 38. When the playback end position 22 of the first track is detected, the playback is ended, and a search is made for the playback start position 23 of the second track. The track is played back from that position to the playback end position 24 of the second track. Thereafter, the same operation is performed for each rack until the playback end position 26 of the last track is reached.
Let's play.

Effects of the Invention As described in Section 2, the compact disc of the present invention records two types of time codes representing arbitrary sections within the program area as section information in the subcode of the lead-in area.
The playback device of the present invention is configured to sequentially play back the sections specified by the section information according to the section information recorded in the subcode of the lead-in area. The playback section represented by the section information can be made variable. Therefore, when performing music scan playback, there will be no interruptions in the middle of phrases, and the playback section can be set for each track, so disc producers can use this function to express the contents of the disc more effectively. The present invention provides a method for reproducing the same, and a reproducing apparatus for the same.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a compact disc according to an embodiment of the present invention, FIG. 2 is a data mat diagram showing the R channel area of the lead-in area of the compact disc according to an embodiment of the present invention, and FIG. A sectional view of a compact disc according to the compact disc program of the embodiment,
Figure 6 (a) is a data format diagram showing the TOC recorded in the Q channel area of the lead-in area of the conventional combo disc. The relationship diagram, FIG. 7, is a schematic diagram of the program area of a compact disc. 1... Compact disc, 2... Lead-in area, 3... Program area, 4... Lead-out area, II... Trunk number, I2... Time code indicating playback start position, I3・・・
・Time code indicating the playback end position, 33...EFM
Demodulator, 34... CIRC decoder, 35... Microcomputer, 36... Spindle motor, 37... Servo circuit, 38... D/A converter, 39... Audio output terminal.

Claims (3)

[Claims] (1) A compact disc playback method characterized in that section information representing an arbitrary section within the disc is recorded in the disc, and the sections of the disc are sequentially played back using the section information. (2) A compact disc characterized in that two types of time codes representing arbitrary sections within the program area are recorded as section information in the subcode of the lead-in area. (3) A playback device for playing a compact disc according to claim 2, characterized in that the sections specified by the section information are sequentially played back according to the section information recorded in the subcode of the lead-in area.