KR19980017217A - Disc Discrimination Method in Digital Video Disc Players - Google Patents

Abstract

The present invention relates to a disc discrimination method in a digital video disc player, comprising the steps of (a) determining whether a disc is loaded in a disc tray, and (b) once the disc is loaded, Setting the playback mode to digital video disc mode, at the same time turning on the timer and starting the count, and (c) the sync code of the digital video disc until the timer's counted time reaches a predetermined time. Determining that the digital video disc is detected and (d) if the sync code of the digital video disc is not detected until the counted time of the timer reaches a predetermined time, the disc is assumed to be a video compact disc or a compact disc and played back. Set the mode to compact disk mode, and simultaneously timer Initializing the count and initializing the count; and (e) determining that the disk is a compact disk or a video compact disk if a sync signal of the compact disk is detected until the counted time of the timer reaches a predetermined time. It includes and consists of steps.

Therefore, the present invention has the effect of determining the type of the disc more quickly by detecting and confirming only the SYNC signal among the data recorded on the disc in determining the type of the disc.

Description

Disc Discrimination Method in Digital Video Disc Players

1 is a schematic block diagram of a general digital video disc player for practicing the present invention.

2 is a flowchart of a disc discrimination method in a digital video disc player according to a preferred embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

5: key input unit 10: control unit

15: optical pickup unit 20: RF amplifier and focus / tracking error detection unit

25: servo signal processing unit 30: motor and motor driving unit

35: digital signal processor 40: MPEG-2 video decoder

45: video signal processor 55: audio signal processor

50: AC-3 decoder

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital video disc player, and more particularly, to a disc discrimination method in a digital video disc player, which makes it possible to quickly and easily determine the type of disc mounted in a digital video disc player.

With the development of audio and video media, optical disc players for recording and reproducing video and audio data on semi-permanent optical discs have been developed.

Such an optical disc flare reproduces an image and / or an audio recorded on an optical disc and outputs it through a screen and / or a speaker, and has a higher signal-to-noise ratio than conventional image and / or audio reproducing apparatus, resulting in better image quality and / or Or it can reproduce signals with sound quality, generate no noise due to irregular reproduction and modulation, very low distortion, no ghost, random access, etc. There is a trend.

In addition, such an optical disk player includes a compact disk player (CDP), a laser disk player (LDP), a compact disk graphic player (CDGP), and a video compact disk player (VCDP: video compact disk player) has been developed and used.

Recently, a digital video disk (DVD) using MPEG-2 moving picture compression technology and a digital video disk player for reproducing the same have been developed, which includes a video including a moving picture in a 12 cm optical disc such as a current CD. Giga byte (GB) data can be recorded and played back, and the current CD and VCD can be played back.

On the other hand, in order to play a predetermined optical disc in such a DVD player, first, the type of the disc mounted in the disc tray must be determined, and a play mode must be set according to the type of the disc.

In order to determine the type of such a disc, conventionally, assuming that a disc mounted in a disc tray is a DVD and then searching for a lead-in area on the disc, the first sector of the lead-in area is searched. If the data is 'OOh', it is determined to be DVD and the playback mode is set to DVD mode, otherwise it is assumed to be CD or VCD, and then it is determined whether TOC (table of content) data can be read. Determining the VCD and setting the playback mode to the CD mode causes a problem in that it takes some time to determine the type of the disc mounted in the disc tray and to execute the playback.

Accordingly, the present invention has been made to solve such a problem in the related art, and an object of the present invention is to determine a type of disc mounted in a digital video disc player so that playback can be performed quickly in a digital video disc player. The present invention provides a disk discrimination method.

According to a preferred embodiment of the present invention for achieving this object, a method for determining the type of a disc mounted in a digital video disc player, the method comprising the steps of: (a) determining whether a disc is loaded in a disc tray; B) assuming that the disc is a digital video disc once the disc has been loaded in step (a), setting the playback mode to the digital video disc mode, simultaneously turning on a timer and starting a count; Determining that the digital video disc has been detected until the counted time of the digital video disc reaches a predetermined time; and (d) until the counted time of the timer reaches the predetermined time; If the sync code of the video compact disc Assuming a compact disc, setting the playback mode to the compact disc mode, simultaneously starting a timer after initializing the timer, and (e) synchronizing the compact disc until the counted time of the timer reaches a predetermined time; Determining if the disk is a compact disk or a video compact disk if a signal is detected and otherwise error handling.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic block diagram of a conventional DVD player for practicing the present invention.

As shown in FIG. 1, a typical DVD player for implementing the present invention includes a key input unit 5, a control unit 10, an optical pickup unit 15, an RF (radio frequency) amplifier and a focus / tracking error detection unit ( 20, servo signal processor 25, motor and driver 30, digital signal processor 35, MPEG-2 video decoder 40, AC-3 decoder 50, audio signal processor 55, video signal It comprises and is comprised of the process part 45. FIG.

The optical pickup unit 15 performs optical pickup from the disk D loaded in the disk tray (not shown), and outputs an RF signal read out accordingly.

In addition, the motor and the motor driving unit 30 drive the spindle motor (not shown) to rotate the disk D, and drive the pickup transport motor (not shown) so that the optical pickup unit 15 performs optical pickup. To read the data recorded on the disk D and output it as an RF signal.

The RF amplifier and tracking / focus error detection unit 20 amplifies the RF signal provided from the optical pickup unit 15 and provides it to the digital signal processing unit 35. The RF signal and the tracking / focus error detection unit 20 also detect the focus and tracking error signals from the signal, and then the servo signal. It is provided to the processing part 25.

The servo signal processor 25 provides the servo and the servo driver according to the focus and tracking error signals provided from the RF amplifier and the tracking / focus error detector 20 to the motor and the motor driver 30 to perform tracking and focus servo. .

The digital signal processor 35 digitally processes the amplified RF signal provided from the RF amplifier and the tracking / focus error detector 20, performs error detection and error correction, and then outputs the signal to the MPEG-2 decoder 40. do. The MPEG decoder 40 separates the error corrected bit stream type digital signal provided from the digital signal processor 35 into a video signal and an audio signal, and then outputs the audio signal to the AC-3 decoder 50. The video signal is decoded based on the MPEG-2 video compression format and then output to the video signal processor 45.

The AC-3 decoder 50 decodes the audio signal encoded by the Dolby AC-3 scheme provided from the MPEG-2 video decoder 40 and is provided to the audio signal processor 55, and the audio signal processor 65 ) Converts the decoded audio signal provided from the AC-3 decoder 50 into an audio signal processing and an analog signal and outputs a speaker (not shown).

The video signal processor 45 processes the decoded video signal provided from the MPEG-2 video decoder 40 and decodes and processes the sub picture signal to output a screen (not shown) for display.

Meanwhile, the key input unit 5 provides a key signal for executing a predetermined function in the DVD player, and the control unit 10 transmits a control signal according to the key signal provided from the key input unit 5 to the respective components. The control unit 10 includes a timer (not shown) and a memory (not shown).

On the other hand, according to the present invention, when the disk (D) is loaded in the disk tray (not shown), first, the control unit 10 is the servo signal processing unit 25, the motor and motor driver 30 and the digital signal processing unit 35 By generating a control signal, each component is set to the DVD mode to process the DVD playback signal, and at the same time, the built-in timer is 'on' and the count is started.

Thereafter, the controller 10 determines whether the DVD SYNC code is detected until the elapsed time of the timer, that is, the time counted by the timer, reaches a predetermined time, at which time the DVD is reached until the predetermined time is reached. When the sync code is detected, the loaded disc D is identified as a DVD. Otherwise, a control signal is generated again, and each component is set to the CD mode to process a playback signal of a CD or a VCD. After initialization, count starts again.

Then, the control unit 10 checks again whether or not the CD synchronization signal is detected until a predetermined time elapses, and if detected, discriminates the loaded disk D as CD or VCD, and then executes playback.

At this time, if the CD sync signal is not detected, the controller 10 cannot determine the type of the disc D, and thus processes the error.

2 is a flowchart of a disc discrimination method in a DVD player according to a preferred embodiment of the present invention.

In step S10, it is determined whether the disc D is loaded in the disc tray. If it is determined in step S10 that the disc D is loaded, the process proceeds to step S20.

When the process proceeds from step S10 to step S20, in step S20, the loaded disc D is assumed to be DVD and the playback mode is set to the DVD mode.

Thereafter, in step S30, the timer is 'on' and the count is started, and in step S40 it is determined whether the DVD sync code is detected. If the DVD sync code is detected in step S40, the process proceeds to step S60, and if not, the process proceeds to step S50.

When the process proceeds to the step S60 in step S40, in step S60, the disk D loaded in the step S10 is determined as a DVD and the flow ends, and the process proceeds to the step S50 in the step S40. In step S50, it is determined whether the counted time of the timer that started counting in step S30 has passed a predetermined time.

If the predetermined time has not elapsed in step S50, the flow returns to step S40 to repeat the flow, and if the predetermined time has elapsed, the flow proceeds to step S70. Then, in step S70, the playback mode is set to the CD mode. In step S80, the timer is initialized and counting is started again.

In step S90, it is determined whether the CD sync signal is detected. At this time, if the CD sync signal is detected, the process proceeds to step S110, otherwise, the process proceeds to step S100.

When the process proceeds from step S90 to step S100, in step S100, it is determined whether the timer counted time reaches a predetermined time, that is, the time to set the CD mode and detect data has elapsed. If a predetermined time has elapsed in step S100, the flow advances to step S120. Otherwise, the flow returns to step S90 to repeat the flow. If the process proceeds from step S100 to step S120, the disc D cannot be determined in step S120, and thus the flow ends after an error process.

On the other hand, when the process proceeds to step S110 in step S90, in step S110, after determining the disk D loaded in step S10 as CD, the flow ends.

Therefore, the present invention has an effect of determining the type of the disc more quickly by detecting and confirming only the SYNC signal among the data recorded on the disc in determining the type of the disc.

While the invention has been shown and described with reference to certain preferred embodiments, those skilled in the art will recognize that various modifications and changes can occur without departing from the spirit and scope of the invention as set forth in the following claims.

Claims (1)

In the method for determining the type of the disc to be mounted on the digital video disc player, (A) determining whether a disc is loaded in the disc tray; (B) assuming the disc is a digital video disc once the disc is loaded in step (a), setting the playback mode to the digital video disc mode, simultaneously turning on a timer and starting a count; (C) if the sync code of the digital video disc is detected until the counted time of the timer reaches a predetermined time, determining the digital video disc; (D) If the sync code of the digital video disc is not detected until the counted time of the timer reaches a predetermined time, the disc is assumed to be a video compact disc or a compact disc, and the playback mode is set to the compact disc mode. Simultaneously starting the count after initializing the timer; (E) determining that the disc is a compact disc or a video compact disc if an synchronous signal of the compact disc is detected until the counted time of the timer reaches a predetermined time, and otherwise error processing. Disk determination on Linux.