JPH0428077A - Disk player - Google Patents

Abstract

PURPOSE:To enable the random access in a time unit and also the display of a lapse of time from the beginning of a program by providing a conversion part for converting a frame number to be recorded to a disk into a time conversion value and converting a bit of time information to be inputted from the exterior into a frame number. CONSTITUTION:The conversion part 7 is provided for the purpose of converting a frame number to be recorded to a disk 8 into its time and a bit of time information to be inputted from the exterior into a frame number concerned. When a laser vision disk is set in the player, whether it is a standard disk or a long playing disk is detected by a control signal processing part 4, and in the case of the standard disk, the frame number is converted into the time, and is displayed on a display part 6 together with a chapter number and the frame number to be recorded on the disk. Then, when an instruction of the random access by time is issued from the exterior, this time value to be given is converted into a frame number, and the random access by frame number is carried out accordingly. By this method, the random access in the time unit and the display of the lapse of time from the beginning of the program can thus be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to an NTSC laser vision disc (
The present invention relates to a disc playback device (hereinafter abbreviated as a player) capable of playing back a disc (hereinafter abbreviated as LD).

Conventional LDs have video signals, audio signals, and information signals for controlling the player recorded on a disk with a diameter of 30C1 or 20cm. There are two types of discs: standard discs (hereinafter referred to as CAV discs) and long-distance discs (hereinafter referred to as CLV discs).CAV discs have one screen recorded per revolution of the disc, and the playback time is maximum on one side. 30 minutes (when using a 301 disc), and on a CLV disc, signals are recorded at a constant linear velocity, and the playback time is a maximum of 60 minutes on one side (when using a 301 disc).
Chapter numbers, frame numbers, and time numbers are recorded along with video and audio signals during disc production. Chapter numbers indicate program divisions on a disc, but some discs do not have chapter numbers recorded on them. Frame numbers are recorded only on CAV discs, and are consecutively assigned to each screen from the beginning of the disc program. Further, the time number is recorded only on CLV discs, and indicates the elapsed time when normal playback is performed from the beginning of the disc. In addition, the LD has a TOC (Table
Some discs have a table of contents recorded on them, and in the case of CAV discs, the total performance time, total number of chapter numbers, total number of frames, etc. are recorded.

The conventional player will be explained below with reference to the drawings.

FIG. 3 shows a block diagram of a conventional disc playback device. In the figure, 1 is a signal detection section, 2 is a video processing section, 3 is an audio processing section, 4 is a control signal processing section, and 5 is a player control section. , 6 is a display section, 8 is a disk, 9 is a video output terminal, l
O is an audio output terminal.

When the LD is played back by a player, the information recorded on the disc 8 is extracted by the signal detection section 1. The video processing section 2 converts the information extracted by the signal detection section 1 into a video signal and outputs it to the video output terminal 9.

The audio processing section 3 converts the information extracted by the signal detection section 1 into an audio signal and outputs it to the audio output terminal 10. The control signal processing section 4 determines the type of LD, outputs an LD discrimination signal to the player control section 5, and also outputs the chapter number and frame number in the case of a CAV disc, and the chapter number and time number in the case of a CLV disc. Output to the display section 6. The player #control unit 5 plays the LD in a playback mode according to the type of LD according to the discrimination signal, and also controls the player according to instructions and operations input from the outside.

The problem that the invention aims to solve One of the characteristics of the player is the ability to quickly perform random access.Humans usually perceive the passage of time in seconds, minutes, and hours, so random access is also performed using time numbers. It is easier to understand how far the screen after access is from the previous screen if the CAV disk is used. However, since time numbers are not recorded on CAV disks, random access in units of time is not possible. Another problem is that the elapsed time cannot be easily determined when normal playback is performed from the beginning of the disc.

The present invention solves the above-mentioned problems, and by converting frame numbers into time units of seconds and minutes when playing CAV discs, players can perform random access in time units and display the elapsed time from the beginning of the program. The purpose is to provide

Means for Solving the Problems To achieve this object, the player of the present invention adds a conversion section to the conventional player that converts frame numbers into time and converts externally input time information into frame numbers. It is something.

When an LD is inserted into the active player, it detects whether it is a CAV disc or a CLV disc, and starts playback according to the disc. In the case of a CAV disc, the frame number is converted into time and displayed on the display unit along with the chapter number and frame number recorded on the disc. In addition, random access, special reappointment, etc. are performed according to instructions/operations input from the outside, and if there is an instruction for random access based on time, the given time value is converted to a frame number, and the time value is converted to a frame number. Perform random access.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a block diagram of a player in one embodiment of the present invention. In the figure] is a signal detection section, 2 is a video processing section, 3 is an audio processing section, 4 is a control signal processing section, 5 is a player control section, 6 is a display section, 7 is a conversion section, 8 is a disk, 9 is a video The output terminal 10 is an audio output terminal.

When the LD is played back by a player, the information recorded on the disc 8 is extracted by the signal detection section 1. The video processing section 2 converts the information extracted by the signal detection section 1 into a video signal and outputs it to the video output terminal 9.

The audio processing section 3 converts the information extracted by the signal detection section 1 into an audio signal and outputs it to the audio output terminal 10.

The following will explain how to play a CAV disc.

The control signal processing unit 4 extracts the chapter number and frame number recorded on the LD, and also
It is determined that it is an AV disc.

The conversion unit 7 converts the frame number extracted by the control signal processing unit 4 into a time conversion value.The display unit 6 converts the frame number extracted by the control signal processing unit 4 into a time conversion value output from the conversion unit 7. Display the value. The player control section 5 receives C output from the control signal processing section 4.
It reads the identification signal indicating that it is an AV disc, and
Play the LD in disc playback mode. It also performs random access and special playback in response to instructions and operations input from the outside. If there is an instruction for random access based on time, the input time value is converted into a frame number and random access based on the frame number is performed.

Next, the process of converting a frame number into a time equivalent value will be explained with reference to the drawings.

FIG. 2 shows the conversion process in the conversion section 7. In the figure, reference numeral 11 indicates a disc determination section, 12 a conversion section to a transfer conversion value, and 13 a conversion section to a time conversion value. When a CAV disc is placed on the player, the disc determination unit 1
1 determines whether a TOC is recorded on the innermost circumference of the CAV disc.

First, a case where no TOC is recorded will be explained. If the TOC is not recorded, the disc determination unit 11
divides disks into three types: Disk A is NTS
This is a recording of video produced in the C format, and the number of frame numbers incremented per second is 30. Disc B records video produced using a movie-like film, and the number of frame numbers incremented per second is 24. Disc C is a disc in which the main part of the program is recorded at <24 frame numbers/second, the same as disc B, but only the first 10 to 40 seconds of the program are recorded at 30 frame numbers/second. Disk B can be determined by checking the frame number increase number of 7 seconds at the beginning of the program, but to distinguish between disk A and disk C, it is necessary to check the frame number increase number of 7 seconds after 10 to 40 seconds. . Therefore, in order to identify the disc, it is necessary to always perform normal playback from the beginning of the program for a certain period of time after the CAV disc is set in the player, and to prohibit various random accesses and special playbacks. The conversion unit 12 to a conversion value converts a frame number into a conversion value according to the type of disc based on the determination signal from the disc determination unit 11. Next, a case where TOC is recorded will be explained. If there is a TOC, if the total playing time of the disc recorded in the TOC is A minutes, B seconds, and C frames, and the total number of frames is X frames, then the formula shown below is % formula % X1... Frame number increase The time (seconds) when the number 7 seconds is 30 X2...The time (seconds) when the number of frame number increases 7 seconds is 24.
It is possible to instantly determine the time at which the frame number increment of 7 seconds changes in the case of disk C.

Therefore, there is no need to prohibit various random accesses and special playbacks within a certain period of time, which would have been necessary if there was no TOC.Based on this result, the conversion unit 12 to a converted value
A conversion unit 13 for converting to a 0-time conversion value, which converts a frame number according to the disc type to a true value for seconds, converts the conversion value outputted from the conversion unit 12 to a conversion value into a time conversion value. do. When there is an instruction for random access based on time from the outside, the input time value is converted into a converted value in the conversion unit 13 to a converted value, and the converted value is converted into a converted value in the conversion unit 12 to converted value. to a frame number appropriate for the disc type.

As described above, according to this embodiment, the conversion unit 7 is added, the frame number is converted to time conversion Even when playing back, random access by time is possible, allowing you to know the elapsed time from the beginning of the program when playing normally.

Effects of the Invention As described above, the present invention can greatly improve the operability of the player by providing the converter.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a disk in one embodiment of the present invention. 1... Signal detection unit, 2... Video processing unit, 3... Audio processing unit, 4... Control signal processing unit, 5... ...Player control section, 6...
... Display section, 7 ... Conversion section, 8 ... Disk, 9 ... Video signal output terminal, 10 ...
. . . Audio signal output terminal, 11 . . . Disk determination section, 12 . . . Second conversion unit, 13.
...Converter to time-converted true value. Name of agent Patent attorney Densuke Awano 1 person 8-゛tisf・(/-II* f Mainland 27 Mizuko IQ -f Voice e:, 271s”r ? Figure d

Claims (1)

[Claims] A disc playback device comprising: a converter that converts a frame number recorded on a disc into a time conversion value; and a converter that converts externally input time information into a frame number.