KR100212542B1 - Disc discrimination method for digital video disc player - Google Patents

Abstract

The present invention relates to a disc discrimination method in a digital video disc player, which comprises: (a) determining whether a disc is loaded on a disc trayer; (b) A step of setting a playback mode to a digital video disk mode at the same time, turning on a timer and starting counting, and (c) synchronizing the digital video disk until the counted time of the timer reaches a predetermined time Determining whether the digital video disc is detected if a code is detected; and (d) if the sync code of the disc is not detected until the counted time of the timer reaches a predetermined time, the disc is detected as a video compact disc or a compact disc Assume that the playback mode is set to the compact disk mode, and at the same time (E) if the sync signal of the compact disc is detected until the counted time of the timer reaches a predetermined time, the disc is determined to be a compact disc or a video compact disc, and if not And processing.

Therefore, the present invention has the effect of discriminating the type of the disc more quickly by detecting and checking only the sync signal among the data recorded on the disc in discriminating the disc type.

Description

Disc identification method in digital video disc player

FIG. 1 is a schematic block diagram of a general digital video disk player for carrying out the present invention; FIG.

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

DESCRIPTION OF THE REFERENCE NUMERALS

5: key input unit 10:

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

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

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

45: Video signal processing unit 50: AC-3 decoder

55: audio signal processor

The present invention relates to a digital video disk player, and more particularly, to a disk discrimination method in a digital video disk player that makes it possible to quickly and easily discriminate the type of a disk mounted on a digital video disk player so that reproduction can be performed quickly.

As audio and video media evolve, an optical disc player has been developed which records and plays video and audio data on a semi-permanent optical disc.

The optical disk player reproduces the video and / or audio recorded on the optical disk and outputs the reproduced video and / or audio through the screen and / or the speaker. The optical disk player has a higher signal-to-noise ratio than the conventional video and / (Or ghost) and random access, which can reproduce a signal with high quality and / or sound quality without causing irregular reproduction and modulation noises, with few distortions, and without ghost The trend is spreading.

The optical disk player includes a compact disk player, a laser disk player (LDP) and a compact disk graphic player (CDGP), a video compact disk player (VCDP) : video compact disk player) have been developed and used.

In recent years, a digital video disk (DVD) using a moving picture compression technique of MPEG-2 and a digital video disk player for reproducing the digital video disk have been developed. This is because a 12 cm optical disk, It can record and play back data in gigabytes (gigabytes), and is compatible with the current CD and VCD.

Meanwhile, in order to reproduce a predetermined optical disc in such a DVD player, the type of the disc loaded in the disc tray must be determined and the reproduction mode must be set according to the type of the disc.

In order to discriminate the type of such a disc, conventionally, a disc mounted on a disc tray is assumed to be a DVD once, and a lead-in area on the disc is then installed, and then the first sector of the lead- If the data is " 00h ", the DVD is determined to be a DVD and the playback mode is set to the DVD mode. Otherwise, it is determined that the TOC data can be read after assuming the CD or VCD. VCD, and setting the reproduction mode to the CD mode, it takes a long time to determine the type of the disc loaded in the disc tray and to perform the reproduction.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a digital video disk player capable of promptly reproducing a disc loaded in a digital video disc player, And to provide a disk discrimination method.

According to a preferred embodiment of the present invention, there is provided a method for identifying a type of a disc loaded in a digital video disc player, the method comprising: (a) determining whether a disc is loaded in a disc tray; (B) if the disc is loaded in the step (a), the disc is once assumed to be a digital video disc and a playback mode is set to a digital video disc mode, simultaneously with turning on a timer and starting counting; Determining if the sync code of the digital video disk is detected until the counted time of the timer reaches a predetermined time; and (d) determining whether the counted time of the timer reaches a predetermined time, If the sync code of the disc is not detected, Setting a playback mode to a compact disk mode, simultaneously starting a timer after initializing a timer, and (e) starting counting of the timer until the counted time of the timer reaches a predetermined time, And if the synchronizing signal is detected, discriminating the disc as a compact disc or a video compact disc and otherwise error-processing.

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

FIG. 1 is a schematic block diagram of a typical DVD player for carrying out the present invention.

1, a typical DVD player for carrying out 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 / A video signal processor 20, a servo signal processor 25, a motor and motor driver 30, a digital signal processor 35, an MPEG-2 video decoder 40, an AC-3 decoder 50, And a video signal processing unit 45.

The optical pickup 15 executes an optical pickup from a disc D loaded in a disc tray (not shown) and outputs an RF signal read out in this way.

The motor and motor driving unit 30 drives a spindle motor (not shown) to rotate the disk D and drives a pickup transfer motor (not shown) so that the optical pickup unit 15 executes the optical pickup And reads the data recorded on the disk D and outputs it as an RF signal.

The RF amplifier and the tracking / focus error detection unit 20 amplify the RF signal provided from the optical pickup unit 15 and provide the amplified RF signal to the digital signal processing unit 35. The RF amplifier and the tracking / focus error detection unit 20 also detect the focus and tracking error signal, Processing unit 25 as shown in FIG.

The servo signal processing unit 25 provides the servo signals corresponding to the focus and tracking error signals provided from the RF amplifier and the tracking / focus error detection unit 20 to the motor and motor driving unit 30, respectively, to perform tracking and focus servo .

The digital signal processor 35 performs digital signal processing on the amplified RF signal provided from the RF amplifier and the tracking / focus error detector 20, performs error detection and error correction, and outputs the amplified RF signal to the MPEG-2 decoder 40 do. The MPEG decoder 40 separates the error-corrected bit stream digital signal provided from the digital signal processing unit 35 into a video signal and an audio signal and outputs the audio signal to the AC-3 decoder 50 And decodes the video signal in accordance with the MPEG-2 video compression format, and outputs the decoded video signal to the video signal processing unit 45.

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

The video signal processing unit 45 processes the decoded video signal provided from the MPEG-2 video decoder 40 and also decodes and video-processes the subpicture signal and outputs it to a screen (not shown) to be displayed.

The key input unit 5 provides a key signal for performing a predetermined function in the DVD player. The control unit 10 outputs a control signal corresponding to the key signal provided from the key input unit 5 to the respective components (Not shown) and a memory (not shown) are incorporated in the control unit 10. The control unit 10 includes a timer (not shown) and a memory (not shown).

The control unit 10 may include a servo signal processing unit 25, a motor and motor driving unit 30, and a digital signal processing unit 35. When the disk D is loaded on the disk tray (not shown) , And the respective components are set to the CVD mode so as to process the DVD reproduction signal. At the same time, the built-in timer is turned on and counting is started.

Thereafter, the control unit 10 determines whether a DVD synchronization (SYNC) code is detected until the elapsed time of the timer, that is, the time counted by the timer, reaches a predetermined time. At this time, When the sync code is detected, the loaded disc D is discriminated as a DVD. Otherwise, a control signal is generated to set each component to a CD mode so as to process a reproduction signal of a CD or a VCD. At the same time, After initialization, counting starts again.

Then, the control unit 10 checks whether a CD synchronizing signal is detected until a predetermined time elapses. If the CD synchronizing signal is detected, the control unit 10 discriminates the loaded disc D as a CD or a VCD, and then executes playback.

At this time, if the CD synchronizing signal is not detected, the control unit 10 can not discriminate the type of the disc D and performs error processing.

FIG. 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 disk D has been loaded, the process proceeds to step S20.

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

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

If it is determined in step S40 that the process proceeds from step S40 to step S60, the disc D loaded in step S10 is determined to be a DVD and the flow is terminated. If the process proceeds from step S40 to step S50 In step S50, it is determined whether or not the counted time of the timer that started the counting in step S30 has passed the predetermined time.

If it is determined in step S50 that the predetermined time has not elapsed, the flow returns to step S40 to redo the flow, and if the predetermined time has elapsed, the flow advances to step S70. Then, in step S70, the reproduction mode is set to the CD mode, and in step S80, the timer is initialized and then counting is started again.

In step S90, it is determined whether a CD synchronizing signal is detected. If a CD synchronizing signal is detected, the process proceeds to step S110. Otherwise, the process proceeds to step S100.

If it is determined in step S90 that the counted time of the timer has reached the predetermined time, that is, whether or not the CD is set to the CD mode and the data is detected, the predetermined time has elapsed. If the predetermined time has elapsed in step S100, the flow advances to step S120, otherwise, the flow returns to step S90 and the flow is re-executed. If the process goes from step S100 to step S120, it is determined that the disc D can not be discriminated in step S120.

On the other hand, if the process goes from step S90 to step S110, it is determined in step S110 that the loaded disc D is a CD, and then the process ends.

Therefore, the present invention has the effect of discriminating the type of the disc more quickly by detecting only the sync (SYNC) signal among the data recorded on the disc in discriminating the disc type.

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

Claims (1)

A method for determining a type of a disc loaded in a digital video disc player, the method comprising: (a) determining whether a disc is loaded in a disc tray; (B) if the disc is loaded in the step (a), the disc is temporarily assumed to be a digital video disc and the playback mode is set to the digital video disc mode, at the same time, the timer is turned on and the count is started; (C) if the sync code of the digital video disk is detected until the counted time of the timer reaches a predetermined time, the digital video disk is determined; (D) if the sync code of the digital video disk is not detected until the counted time of the timer reaches a predetermined time, the disk is assumed to be a video compact disk or a compact disk, and a playback mode is set to a compact disk mode Initializing a timer and starting counting at the same time; (E) if the synchronization signal of the compact disc is detected until the counted time of the timer reaches a predetermined time, discriminating the disc as a compact disc or a video compact disc, In the disk.