KR19980030569A - Disc determination method of digital video disc player - Google Patents

Abstract

The present invention relates to a disc discrimination method of a digital video disc player, comprising: (a) setting the digital video disc player to a disc discrimination mode when a disc is loaded; and (b) performing optical pickup for the loaded disc. Detecting the amount of light of the picked-up optical signal by detecting the picked-up optical signal and converting it into a digital signal, and comparing the amount of light detected in step (c) and (b) with a preset first reference value Discriminating the disc as a digital video disc; and if the amount of light detected in steps (d) and (b) does not match the first reference signal, compares the disc with a second preset reference signal and matches the disc with a compact disc or video compact disc. And comprising the step of determining.

Therefore, the present invention has the advantage that the type of the disc mounted in the digital video disc player can be easily determined by simply comparing the amount of light picked up.

Description

Discrimination method of digital video disc player

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 type discrimination method of a digital video disc player, which makes it possible to quickly and conveniently determine the type of disc to be loaded into the 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 player reproduces an image and / or 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 playback 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 widely used. Also, recently, a digital video disk (DVD) using MPEG-2 moving picture compression technology and a digital video disk player for playing the same have been developed. It can record and play back gigabytes (GB) of data, including moving images, on a 12cm optical disc such as a CD. It is also designed to be compatible with current CDs and VCDs.

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, search for a lead-in area on the disc, read the data, and then read the first sector of the lead-in area. If the data in (sector) is '00h', it is determined as DVD and the playback mode is set to DVD mode. Otherwise, it is assumed that CD or VCD can be read, and then it is determined whether TOC (table of content) data can be read. When read, it is determined that the CD or VCD and the playback mode is set to the CD mode. There is a problem that it takes some time to determine the type of the disc mounted on the disc tray and perform the playback.

On the other hand, CDs and VCDs used in digital video disc players are formed with a thickness of 1.6 mm, and DVDs are formed with a two-layer structure or a double-sided structure with 0.6 mm thick disks.

That is, CD and VCD have a distance of 1.6 mm from the disk surface to the light reflection surface, and DVD has a distance of 0.6 mm from the disk surface to the light reflection surface.

Therefore, the incident distance and the reflection distance of the light incident on the disc are different by about 2 mm or more in Cd, VCD, and DVD, and the amount of light reflected by the distance is also different. Will be largely detected.

Accordingly, the present invention is conceived in view of the above, and an object of the present invention is to provide a disc discrimination method in a digital video disc player, which enables faster playback by determining the type of disc mounted in the digital video disc player more quickly. .

According to a preferred embodiment of the present invention for achieving the above object, in the disc discrimination method of a digital video disc for determining the type of disc to be loaded for performing a function such as playback in a digital video disc player, (a) When the disc is loaded, setting the digital video disc player to a disc discrimination mode; (b) performing an optical pickup for the loaded disc to detect the picked up optical signal, converting it to a digital signal, and then picking up the picked up optical signal. (C) determining the loaded disc as a digital video disc if the amount of light detected in step (c) is matched by comparing the amount of light detected in the step (b) with a preset first reference value; B) If the amount of light detected in the step does not coincide with the first reference signal, If the value comprises the step of determining the disk in a compact disk or a video compact disk.

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

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

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

5: key input section 10: control section

15: Optical pickup section 18: A / D converter

20: RF amplifier and focus / tracking error detector

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

35: Digital signal processing part 40: MPEG-2 video decoder

45: video signal processor 50: AC-3 decoder

55: audio signal processor 60: screen

65: speakers

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 DVD player for implementing the present invention includes a key input unit 5, a control unit 10, an optical pickup unit 15, and an analog / digital converter (A / D): 18, a radio frequency (RF) amplifier and a focus / tracking error detector 20, a servo signal processor 25, a motor and a motor driver 30, a digital signal processor 35, an MPEG-2 video decoder 40, And an AC-3 decoder 50, an audio signal processor 55, a video signal processor 45, a screen 60, and a speaker 65.

On the other hand, the DVD player for carrying out the present invention may be characterized by further comprising an A / D converter 18 in addition to the conventional DVD player.

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

In addition, the motor and the motor drive unit 30 drive the spindle motor (not shown) to rotate the disk D, and drive the pickup transfer 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 digital signal in the form of an error-corrected bit stream 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 method provided from the MPEG-2 video decoder 40 and provides the audio signal to the audio signal processor 55, and the audio signal processor 5 ) Converts the decoded audio signal provided from the AC-3 decoder 50 into an audio signal processing and an analog signal and outputs the speaker 65.

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 the screen 60 to be displayed.

In addition, the key input unit 5 provides a key signal for executing a predetermined function in the DVD player, and the control unit 10 sends 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). The key input unit 5 also has a disc type designation key for designating the type of the disc.

Meanwhile, according to the present invention, if it is detected that the disc is loaded in the disc tray, the controller 10 sets the mode of the video disc player to the disc discrimination mode, and then generates a control signal to the motor and the motor driver 30 to generate a motor and the like. By driving the motor drive unit 30, the optical pickup unit 15 executes the optical pickup. At the same time, the controller 10 drives a built-in timer to count the time for which the optical pickup is executed.

The A / D converter 18 converts the RF signal picked up by the optical pickup unit 15 and amplified by the RF amplifier unit 2 into a digital signal and outputs the light amount of the optical signal picked up by a predetermined level. To the control unit 10.

Then, the controller 10 refers to the time counted in the timer, and the first reference value (the first reference value is a value when the digital video disc is stored) is preset and stored in the built-in memory. The value determined by the experiment is a value obtained by converting the amount of light reflected from the DVD into a digital signal). At this time, if the detected amount of digital light is equal to the first predetermined reference value, the loaded disc is determined as a DVD.

In addition, if the detected disk light quantity value is different from the preset first reference value, the controller 10 reflects the second reference value pre-set and stored in the memory (the second reference value as a value determined by an experiment at the time of producing the digital video disc, and reflected from the CD or VCD) The amount of light picked up is converted into a digital signal) and the detected amount of digital light is compared with each other.

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

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

Then, in step S20, the digital video disc player is set to the disc discrimination mode, and the flow advances to step S30. Thereafter, in step S30, an optical pickup is performed on the loaded disc to detect the picked-up optical signal and the process proceeds to step S50.

In step S50, the detected optical signal is converted into a digital signal to detect a light amount of the picked-up optical signal, and the flow proceeds to step S60.

When the process proceeds from step S50 to step S60, in step S60, the light quantity detected in the step S50 is compared with a preset first reference value, i.e., the light quantity value obtained when the DVD is optically picked up. do. If the light quantity value detected in step S50 coincides with the first reference value, the process proceeds to step S70; otherwise, the process proceeds to step S80.

First, proceeding from step S60 to step S70, in step S70, the loaded disc is determined as a digital video disc and the flow ends.

On the other hand, when the process proceeds from step S60 to step S80, in step S80, the light quantity value detected in the step S50 is a light quantity value obtained when the CD or VCD is optically picked up and stored in the memory. Compared to the second reference value, if the detected light amount value matches the second reference value, the process proceeds to step S90 to determine the loaded disk as CD or VCD, and then ends the flow. If not, proceeds to step S100. Terminate the flow after error handling.

As described above, the present invention has the advantage that the type of the disc mounted in the digital video disc player can be easily determined by simply comparing the amount of light picked up.

Claims (1)

In the disc discrimination method of a digital video disc for determining the type of disc to be loaded for performing a function such as playback in a digital video disc player, (A) setting the digital video disc player to a disc discrimination mode when the disc is loaded; (B) detecting an optical signal to be picked up by performing an optical pickup for the loaded disk, and converting the optical signal to a digital signal to detect an amount of light of the picked-up optical signal; (C) determining the loaded disc as a digital video disc if the amount of light detected in the step (b) is compared with a preset first reference value; (D) if the amount of light detected in step (b) does not match the first reference signal, comparing the preset second reference signal to determine the disc as a compact disc or a video compact disc. How to determine the disc of a disc player.