JPH0982015A - Disk unit - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a disc device which can be accessed and reproduced even when the time address information at the head of the track number on the disc cannot be read. [Structure] The temporary play area setting means 13 sets a temporary play area for a predetermined time in the inner circumferential direction with respect to a target absolute time (total time address information of the entire disk), and the access means 11 determines which of the temporary play areas. When the current position determination means 10 determines that the current position is a temporary play area, the 1-frame increment means 15 increases the temporary play area by 1 frame (time address minimum unit) in the outer peripheral direction. , Perform temporary play to play back without outputting data, and if the current time address information matches the specified track number and the specified relative time (time address information for each track number) during temporary play, end access and play .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc device for reproducing a disc on which information such as music is recorded as a digital signal.

[0002]

2. Description of the Related Art Generally, a disc on which information is recorded as a digital signal has time address information recorded thereon. The minimum time unit of this time address information is a frame which is 1/75 of one second, and the time address information is recorded in this one frame unit. The contents are the absolute time that is the cumulative elapsed time from the playback start position of the disc, the track number that is the chapter number (song number of a music disc), and the elapsed time from the playback start position of each track number as the baseline. There are relative times and so on. Further, these relationships are the absolute time at the beginning of the track number when the difference in relative time is obtained from the absolute time.

FIG. 8 is a block diagram showing the structure of a conventional disk device. In FIG. 8, 1 is a disc on which information is recorded by a digital signal, 2 is a spindle motor for rotating the disc 1, 3 is an optical pickup for reading the digital signal of the disc 1, and 4 is an optical pickup for reading the digital signal. A pickup driving device for changing the position, 5 is a signal processing device for converting a digital signal read from the disc 1 into information such as music, 6 is a servo processing device for focus direction / tracking direction / rotation direction, and 7 is a signal processing device 5 Sub-code reading means for reading time address information (relative time, absolute time, etc.) from the input device, 8 is an input device for the user to operate the disk device and input to the specified track number / specified relative time RAM 9.
Reference numeral 1 is access means for accessing a target position on the disc for accessing any position of the designated track number or any position of the temporary play area, and 10 is current time address information from the subcode reading means 7. The present position judging means for judging whether it is the position of the provisional play area RAM 14 or the position of the designated track number / specified relative time RAM 9, and 12 designates the designated track by obtaining the difference of the relative time from the absolute time of the present position. A means for calculating the absolute time at the beginning of the number, 13 means for setting a temporary play area for a certain time in the inner circumferential direction from the absolute time at the beginning of the track number obtained by the means 12, and 16 for the present position judging means 10. A means for temporarily playing when it is determined to be the play position, and 17 when the current position determination means 10 determines that the access end position Which is the access end reproducing means for raw.

FIG. 9 is a flow chart of an access process of a conventional disk device. In FIG. 9, in step 20, any position of the designated track number is accessed. At step 21, the absolute time at the beginning of the designated track number is calculated by obtaining the difference in relative time from the absolute time at that position. In step 22, a temporary play area for a fixed time is set in the inner circumferential direction from the absolute time at the beginning of the track number. In step 23, access is made to any position in the temporary play area. In step 24, it is determined whether the current position is in the temporary play area, and if it is out of the temporary play area, step 23
If it is the temporary play area, the temporary play is performed in step 27 (reproduction without outputting data from the inner circumferential direction from the target time position). In step 28, it is judged whether the time address information of the current position is 0 minutes 0 seconds of the designated track number, and if different, the process goes to step 24 where the time address information of the current position is 0 minutes 0 seconds of the designated track number. Then, in step 29, access is terminated and reproduction is performed.

FIG. 10 is a block diagram showing time address information near the head of a designated track number in a conventional disk device, and FIG. 11 is a schematic diagram showing an access method of the head of a track number in a conventional disk device.

Next, the operation of the above conventional example will be described with reference to FIGS. In the above-mentioned conventional example, after accessing any position of the designated track number in step 20, the absolute time of the head 35 of the designated track number is calculated by obtaining the difference in relative time from the absolute time of that position in step 21. Then, in step 22, the temporary play area 101 for a fixed time is set in the inner circumferential direction from the absolute time at the head of the track number. Then, in step 23, access 1 to any position of the temporary play area 101.
Then, in step 24, the current position is the temporary play area 101.
Then, if it is in the temporary play area, step 27 starts the temporary play 112. In the temporary play 112, if the current position is out of the temporary play area in step 24, the position 113 is accessed 113 in step 23, and the time address information of the current position is 0 minute 0 of the specified track number in step 26. When the time comes, the access is completed in step 27 and reproduction is performed.

As described above, when the specified track number is set in the above-mentioned conventional disk device, reproduction is performed from the beginning of the specified track number.

[0008]

However, in the above-mentioned conventional disk device, in FIG. 10, the disk where the time address information 35 at the beginning of the designated track number cannot be read, or the relative time at the beginning of the track number is 0 minutes 0 seconds 1 frame. A disk starting with (the track number of 35 is the previous track number and the relative time is the last time of the previous track number, so the access end area is 36
Since the temporary play area and the access end area do not overlap with each other, there is a problem that the head of the designated track number cannot be accessed only by repeatedly accessing the temporary play and the temporary play.

The present invention solves such a conventional problem by accessing a disk in which the time address information at the beginning of the track number cannot be read or a disk in which the time address information at the beginning of the track number starts from 0 minutes 0 seconds 1 frame. The present invention provides an excellent disc device that can be played back.

[0010]

In order to achieve the above-mentioned object, the present invention sets a temporary play area for a fixed time in the inner circumferential direction from a target absolute time, and sets it at any position of the temporary play area. At the start of provisional play, the provisional play area is increased by 1 frame in the outer circumferential direction at the start of provisional play, and the current time address information matches the designated track number and the designated relative time while performing the provisional play in which the data is reproduced without outputting the data. At this time, the access is terminated and the data is output and reproduced.

[0011]

Therefore, according to the present invention, since the temporary play area is located in the inner circumferential direction from the access end position until the temporary play is started, the normal disk can be played back without any break. In addition, since the temporary play area is increased in the outer peripheral direction after the temporary play is started, when the time address information at the beginning of the track number cannot be read, the reproduction should be performed from a position as close as possible to the time address information at the beginning of the track number. You can Further, in a disc in which the relative time at the beginning of the track number starts from 0 minutes, 0 seconds, and 1 frame, it is possible to reproduce from the beginning of the track number, and moreover, it is possible to reproduce the data without cutting off.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Generally, a disc on which information is recorded as a digital signal has time address information recorded thereon. The minimum time unit of this time address information is a frame which is 1/75 of one second, and the time address information is recorded in this one frame unit. The contents are the absolute time that is the cumulative elapsed time from the playback start position of the disc, the track number that is the chapter number (the song number for a music disc),
For example, there is a relative time which is an elapsed time based on the reproduction start position for each track number. Further, these relationships are the absolute time at the beginning of the track number when the difference in relative time is obtained from the absolute time.

FIG. 1 is a block diagram showing the configuration of a disk device according to an embodiment of the present invention. In FIG. 1, 1
Is a disc on which information is recorded by a digital signal, 2
Is a spindle motor for rotating the disk 1, 3 is an optical pickup for reading a digital signal of the disk 1, 4
Is a pickup driving device for changing the position of the optical pickup 3 to read a digital signal, 5 is a signal processing device for converting the digital signal read from the disc 1 into information such as music, and 6 is a focus direction / tracking direction / rotation direction. Servo processing device, 7 is a subcode reading means for reading time address information (relative time / absolute time, etc.) from the signal processing device 5, and 8 is a user operating the disk device to input the specified track number / specified relative time RAM 9. An input device 11 for accessing the target position of the disk for accessing any position of the designated track number or any position of the temporary play area, and 10 for the current from the subcode reading means 7. Whether the time address information is the position of the temporary play area RAM 14 or not Click Number specified relative time RAM9
The present position judging means for judging whether the position is the position of 12, a means for calculating the absolute time at the head of the designated track number by obtaining the difference in relative time from the absolute time of the current position, 1
3 is a means for setting a temporary play area for a fixed time in the inner circumferential direction from the absolute time at the beginning of the track number obtained by the means 12, 15 is means for increasing the temporary play area by 1 frame in the outer circumferential direction, and 16 is a present position judgment. A means for performing a temporary play (reproduction without outputting data from the inner circumferential direction from the target time position) when the means 10 determines that the position is a temporary play position, and 17 for reproduction when the current position determination means 10 determines an access end position Access end reproduction means.

FIG. 2 is a flow chart of access processing of the disk device according to the embodiment of the present invention. In FIG. 2, step 2
Access to any position of the specified track number with 0. At step 21, the absolute time at the beginning of the designated track number is calculated by obtaining the difference in relative time from the absolute time at that position. In step 22, a temporary play area for a fixed time is set in the inner circumferential direction from the absolute time at the beginning of the track number. In step 23, access is made to any position in the temporary play area. In step 24, it is determined whether the current position is the temporary play area. If the current position is out of the temporary play area, the process proceeds to step 23. If it is the temporary play area, step 2 is executed.
At 5, the temporary play area is increased by 1 frame in the outer peripheral direction.
At step 27, provisional play (playback is performed without outputting data from the inner circumferential direction from the target time position). In step 28, it is judged whether the time address information of the current position is 0 minutes 0 seconds of the designated track number, and if different, the process goes to step 26 where the time address information of the current position is 0 minutes 0 seconds of the designated track number. Then, in step 29, access is terminated and reproduction is performed. In step 26, it is determined whether or not the current position is the temporary play area during the temporary play. If the current position is out of the temporary play area, the process proceeds to step 23. If the current position is the temporary play area, the temporary play is continued in step 27.

FIG. 3 is a block diagram showing time address information near the head of the designated track number in the access processing of the disk device according to the embodiment of the present invention. In FIG. 3, 3
Reference numeral 1 is a temporary play area before the start of temporary play set in step 22, 32 is a temporary play area during the first temporary play in which the temporary play area 31 is increased by 1 frame in the outer circumferential direction in step 25, and 33 is a temporary play area 32. In step 25, the provisional play area during the second provisional play is increased by 1 frame in the outer peripheral direction, 34 is the access end area which is the area of 0 minutes 0 seconds of the designated track number used as the judgment criterion in step 25, and 35 is This is the start time address of the specified track number calculated by obtaining the relative time difference from the absolute time in step 21, and the relative track start time of the disc starts from 0 minutes 0 seconds 1 frame. It is the track number and the relative time is the last time of the previous track number, and the access end area is 36. It has become.

Next, the operation of the above embodiment will be described with reference to FIGS. FIG. 4 is a schematic diagram showing an access method at the head of the track number. In the above embodiment, after accessing any position of the designated track number in step 20, the absolute time of the head 35 of the designated track number is calculated by obtaining the relative time difference from the absolute time of that position in step 21. Then, in step 22, a predetermined time is set as the temporary play area 31 in the inner circumferential direction from the absolute time at the beginning of the track number. Then, in step 23, access 41 to any position of the temporary play area, and in step 24 it is judged whether the current position is the temporary play area 31 and if it is the temporary play area, the temporary play area is moved to the outer peripheral direction in step 25. One frame is increased to 32, and provisional play is started 42. And during the temporary play, the temporary play area 3
When the current position becomes the access end area 34 in step 28 while performing the temporary play 42 of 2, the access is ended and reproduction is performed in step 29. Further, when the current position deviates from the provisional play area 32 in step 26, one of the positions of the provisional play area is accessed 43 in step 23, and thereafter the second provisional play area is provisionally played 44 and the access processing is repeatedly reproduced. To do.

Thus, according to the above embodiment, FIG.
As shown by, the temporary play area is in the inner circumferential direction from the access end position 34 as before until the temporary play is started 31, and after the temporary play is started, the temporary play area is increased in the outer circumferential direction in step 25. Therefore, the temporary play area 32 and the access end area 34 overlap in many portions, and the data 35 at the beginning of the track number cannot be read, so that the reproduction can be performed from the first position where the time address information can be read. Further, the relative time at the beginning of the track number starts from 0 minute 0 second 1 frame (since the track number of 35 is the previous track number and the relative time is the last time of the previous track number, the access end area is 36 However, there is an advantage that the reproduction can be performed from 0 minute 0 second 1 frame which is the head of the track number.

In the above embodiment, in FIG.
In step 22, a temporary play area is set for a fixed time in the inner circumferential direction from the absolute time at the beginning of the specified track number, and in step 28, it is judged whether the time address information of the current position is 0 minutes 0 seconds of the specified track number. However, as shown in FIG. 5 to FIG. 7, the steps 22 and 28 are provisional play for a fixed time in the inner circumferential direction from the target absolute time of the sum of the absolute time at the beginning of the specified track number and the specified minutes and seconds. The step 51 for setting the area may be step 52 for judging whether the time address information of the current position is a specified minute / second of the specified track number. In this case, not only the access at the beginning of the track number but also the relative time access (access to the relative time of the specified track number) can be performed in the same manner as in the above embodiment, so that the temporary play area and the access end area are Even when there are many overlapping portions and the time address information at the designated time cannot be read, there is an advantage that a position as close as possible to the designated time can be accessed and reproduced.

[0019]

As is apparent from the above-mentioned conventional example, the present invention is such that the temporary play area is in the inner peripheral direction from the access end position as before until the temporary play is started. Can be played without. Further, since the temporary play area is increased in the outer peripheral direction (1 frame) after the temporary play is started 42, when the time address information at the beginning of the track number cannot be read, the time address information at the beginning of the track number can be read as close as possible. It has the effect that it can be played back from a position.

Further, according to the present invention, the relative time at the head of the track number starts from 0 minutes 0 second 1 frame (the track number of 35 is the previous track number and the relative time is the last time of the previous track number. Therefore, in the case where the access end area is 36), it is possible to reproduce from the beginning of the track number, and further, it is possible to reproduce without the data being cut off.

[Brief description of drawings]

FIG. 1 is a block diagram of a disk device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an access operation at the head of the track number in the embodiment.

FIG. 3 is a configuration diagram showing time address information near the beginning of a designated track number in the embodiment.

FIG. 4 is a schematic diagram showing an access method of the head of the track number of the embodiment.

FIG. 5 is a flowchart showing a relative time access operation of the same embodiment.

FIG. 6 is a configuration diagram showing time address information in the vicinity of a designated relative time in the embodiment.

FIG. 7 is a schematic diagram showing a relative time access method of the embodiment.

FIG. 8 is a block diagram of a conventional disk device.

FIG. 9 is a flowchart showing a conventional access operation at the head of a track number.

FIG. 10 is a block diagram showing time address information near the beginning of a conventional designated track number.

FIG. 11 is a schematic diagram showing a conventional method of accessing the beginning of a track number.

[Explanation of symbols]

 1 Disk 2 Spindle Motor 3 Optical Pickup 4 Pickup Driving Device 5 Signal Processing Device 6 Servo Processing Device 7 Subcode Reading Means 8 Operation Input Device 9 RAM 10 Current Position Judging Means 11 Target Position Accessing Means 12 Absolute Time Calculating Means 13 Temporary Play Area Setting means 14 Temporary play area RAM 15 1 frame increment means 16 Temporary play means 17 Access end reproduction means

Claims (1)

[Claims] 1. A means for setting a temporary play area for a predetermined time in the inner circumferential direction from a target absolute time based on time address information on a disk, and a means for accessing any position of the temporary play area. , A means for increasing the provisional play area by 1 frame in the outer circumferential direction at the start of provisional play, and performing a provisional play in which data is reproduced without outputting the current time, and the relative time designated by the track number designated by the address information. The disk device is characterized in that the data is output and reproduced when the access is ended when the data coincides with.