KR20040096334A - Method for playback continuous of optical disc driver - Google Patents

Abstract

PURPOSE: A continuously reproducing method of an optical disk driver is provided to set an optimal reproduction speed capable of performing a continuous reproduction when a disk is recognized. CONSTITUTION: An optical disk driver judges a kind of a disk medium(S110). The driver sets an initial reproduction speed of the disk medium(S120). The driver checks inner circumference, middle, and outer circumference areas of the judged disk medium(S130). The driver decides whether servo error and a data error exceed a reference value(S140). If not, the driver maintains the initial reproduction speed, and reproduces or buffers the disk medium(S160,S170). If the errors exceed the reference value, the driver sets a speed value lower than the initial reproduction speed(S150).

Description

Method for playback continuous of optical disc driver

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc driver, and more particularly, to a continuous reproduction method of an optical disc driver for controlling a double speed for continuous reproduction of an optical disc driver.

Recently, as the use of CDs and DVDs, which require continuous playback power such as movies and music videos, has become widespread, the quality of playback of CD-ROM drives, combo drives, and DVD-ROM drives that play them is becoming an important issue.

Generally, recordable optical discs such as DVD-RAM (Digital Versatile Disc-RAM) are provided with concentric or spiral tracks (groove tracks / land tracks). User data is recorded in the track. In order to record the information on the optical disc, the constant linear velocity (CLV) method according to the position of the track and the bit rate are maintained while maintaining the constant rotation speed from the innermost to outermost position regardless of the position of the track. The Constant Angle Velocity (CAV) method of recording information in the well-known method is widely known.

Such a rewritable optical disc (for example, a DVD-RAM) has a lead-in area, a lead-out area and actual data for recording actual data as shown in FIG. The data area is divided into data areas, and the data areas are again managed by zones.

At this time, the pickup device should be able to move freely to a desired position in order to record / read user data using the optical pickup device.

However, existing drives maintain the playback quality by lowering the disc speed from the initial maximum speed during playback if the recording quality of the discs is not constant.

Fig. 2 is a flow chart showing a conventional method for reproducing an optical disc driver. First, the optical disc driver determines the type of disc (S11).

The disc may be a CD or a DVD.

When the type of the disc is determined, the maximum reproduction speed of the disc is determined (S12).

Then, the optical disc driver starts playing or decoding the determined disc at the set maximum reproduction speed (S13).

After the reproduction starts, the optical disc drive determines whether the reproduction state (quality) is normal (S14).

If the reproduction state is normal, the buffer is stored in the buffer or the reproduction continues (S16). If the reproduction state is not normal, the reproduction speed is lowered to lower the reproduction speed than the set maximum reproduction speed (S15).

In order to maintain the playback quality, if the speed is lowered than the initial maximum speed and the speed is lowered within an appropriate time, the optimal playback quality will be guaranteed, but if the speed is not lowered within an appropriate time, a discontinuous playback problem (for example, Sound / screen interruption) occurs, which significantly reduces the playback quality.

Accordingly, an object of the present invention is to conceive in view of the above-mentioned problems of the prior art, and the optimum playback speed for continuous playback is investigated and set at the disc recognition point. It is an object of the present invention to provide a continuous playback method of an optical disk driver that prevents switching from occurring and enhances the continuity of playback.

Another object of the present invention is to provide a continuous playback method of an optical disk driver which performs a playback check operation according to the position of a disk before full playback in order to check an optimum playback speed suitable for the disk condition.

It is still another object of the present invention to provide a method of continuously reproducing an optical disc driver that uses a combination of servo state determination and data processing results as a criterion for determining the disc quality of the disc.

1 is a view showing the structure of a conventional optical disc

2 is a flowchart for explaining a conventional method for reproducing an optical disc driver.

3 is a flowchart illustrating a continuous playback method of an optical disk driver according to the present invention.

According to an aspect of the present invention for achieving the above object, in the optical disk driver for playing an optical disk, determining the media type of the optical disk, setting the initial playback speed value of the determined media, Checking the playback quality of the inner, middle, and outer regions of the media when the initial playback speed value is set, and determining whether the checked playback quality is included in a reference value, and if so, playing the media. Is done.

Preferably, the reproduction quality is checked in terms of servo and data processing.

In addition, the servo side investigation is to investigate how many times the focus drop occurs during a predetermined time, the seek execution time, and the like, and the data processing side is EDC / ECC (Error). Detection / Error Correction), Header NG Error, Sync NG Error, Target Found NG Error, Mode / Fprm NG Error, etc.

Also included in the reference value should include the values of the investigated servo side and data processing side at the same time.

If the checked reproduction quality is not included in the reference value, a speed value lower than the initially set reproduction speed is set.

Further, the media of the optical disc are CD, DVD and the like.

For reference, an optical disc drive device is largely divided into a host part, a servo part, and a mecha part. The host part belongs to the highest level, and the servo part receives the instruction from the host part and drives the mechanical part.

Briefly summarizing the process of acquiring data from the optical disc media by such an optical disc drive device, first, an address is designated in the host part, and the servo part drives the mechanical part. In general, the driving of the mechanical part is composed of the steps of actuator driving, spindle driving, feeding and seeking.

By driving such a mechanical part, an analog signal is read from the optical disc medium.

The servo part converts the analog signal read out from the optical disk medium into a digital signal, prepares it as a constant format data, and sends the prepared data to the host part. The host part reproduces the video or audio by performing demodulation and error correction based on the data.

Hereinafter, a configuration and an operation according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

3 is a flowchart illustrating a method of controlling a continuous playback speed of an optical disc drive according to the present invention.

Referring to FIG. 3, first, the optical disk driver determines the type of disk media (S110).

The disc media is CD, DVD or the like.

If the type of the disc media is determined, the initial playback speed of the corresponding media is set (S120).

Then, the playback quality of the determined inner circumferential region, middle circumferential region, and outer circumferential region of the disc is examined (S130).

The inspection of the reproduction quality is an inspection in which the disc is examined at the servo side and the data decoding side at the same time. The servo side is the focus drop for a predetermined time at the set initial reproduction speed. Investigate how many times the drop has occurred and examine the seek execution time that reflects servo status such as tracking and PLL.

And, in terms of data processing, the problem occurrence of EDC / ECC (Error Detection / Error Correction) and the number of occurrences of Header NG, Sync NG, Target found NG, and Mode / Form NG are investigated.

After the quality inspection of the inner circumferential region, the middle circumferential region, and the outer circumferential region of the disk is finished, it is determined whether an error of the investigated servo side and an error of a data processing side exceeds a reference value (S140).

Thereafter, if the determination value is not exceeded, the initial playing speed setting value is maintained to play or buffer the disk (S160 to 170).

On the other hand, when the reference value is exceeded and the reference value is exceeded, a speed value lower than the set initial playback speed is set (S150), and the playback quality of the inner, mid, and outer regions is rechecked to set the continuous playback speed to continuously play the disc. do.

The optimum playback speed determined by setting the low speed value may be set to different playback speeds in each region according to the characteristics of the optical disc driver system, but the lowest speed among the investigated speeds in consideration of random access characteristics It is good in terms of stabilization of the regeneration system.

As described above, the present invention has an effect of preventing discontinuous playback phenomena that may occur due to a speed reduction that is not made quickly during the playback by determining a playback speed that can play the entire disc with the best quality at the beginning of disc recognition. .

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the examples, but should be defined by the claims.

Claims (7)

In an optical disc driver for playing an optical disc Determining a media type of the optical disc; Setting an initial reproduction speed value of the determined media; Checking the playback quality of the inner, middle, and outer regions of the media when the initial reproduction speed value is set; and, And determining whether the checked playback quality is included in the reference value, and if so, playing the media. The method of claim 1 The playback quality inspection is performed on the servo side and on the data processing side. The method of claim 2, The servo side irradiation is characterized in that how many times the focus drop occurs during a predetermined time, the seek execution time, etc. are investigated. The method of claim 2, The data processing aspect is a series of optical disk drivers characterized by examining how many times EDC / ECC (Error Detection / Error Correction), Header NG error, Sync NG error, Target found NG error, Mode / Fprm NG error occurs, etc. How to play. The method of claim 1, Included in the reference value is that the value of the irradiated servo side and the data processing side should be included at the same time. The method of claim 1, And if the checked reproduction quality is not included in the reference value, setting a lower speed value than an initially set reproduction speed speed. The method of claim 1, And the optical disc media is a CD, a DVD, or the like.