KR100250576B1 - Apparatus for record control in digital video disc recorder - Google Patents

Abstract

PURPOSE: A data recording controller of a DVDR(Digital Video Disk Recorder) is provided to continuously record data without stopping when a scratch or a defect of an error correctable length is generated on a disk. CONSTITUTION: The first comparing unit(110) generates a high or a low logic signal by comparing a focus error signal from a focus error detecting unit(20) with a reference focus error signal. The second comparing unit(120) generates a high or a low logic signal by comparing a tracking error signal from a tracking error detecting unit(30) with a reference tracking error signal. A microcomputer(130) controls a recording of data by the logic signals. The microcomputer(130) generates a control signal into a recording preventing unit(90) when the tracking error signal is larger than the reference tracking error signal and the focus error signal is smaller than the reference focus error signal. Thereby, the recording function is stopped by isolating data of a data source(80).

Description

Data recording controller of digital video disc recorder

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital video disc recorder, and more particularly, when a focus or tracking error is out of the control range due to scratches or defects on a disc surface within an error correctable range when recording desired data. A data recording control apparatus of a digital video disc player for maintaining recording of a digital camera.

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 the signal with sound quality, it does not generate noise due to irregular reproduction and modulation, very low distortion, no ghost and random access, so it is rapidly developed and widely distributed. 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) and digital video disk (DVD) using MPEG-2 video compression technology have been developed and widely used. In particular, recently, the recording function is added to the playback function of the digital video disk player. Digital video disk recorders have been developed.

1 is a schematic block diagram showing a data recording control apparatus of a digital video disc recorder as described above.

As shown in Fig. 1, the recording control apparatus of the digital video disk recorder is an optical pickup for reading out data recorded on a predetermined disk D and recording data input from an external data source 80 on the disk D. The tracking error detection unit 20 detects a focus error from the optical signal picked up and output from the optical pickup unit 10, and the tracking error is detected from the optical signal picked up and output from the optical pickup unit 10. The tracking error detecting unit 30, when executing the data recording function, records a predetermined data and then records a predetermined amount of light signal of the picked-up optical signal and compares it with a preset reference level signal to confirm whether the data has been recorded well. 40 and an adjustment signal for adjusting the tracking and focus servo in accordance with the output signal of the recording check unit 40 and the output signal of the tracking error detection unit 30. A servo control unit for providing the optical pickup unit 10 with control signals for controlling tracking and focus servos according to the output signals of the servo adjusting unit, the focus error detecting unit 20, the tracking error detecting unit 30, and the servo adjusting unit 50. 60, and controls the general functions of the digital video disc recorder, and records with reference to the focus error signal and the tracking error signal provided from the focus error detector 20 and the tracking error detector 30 when the recording function is executed. If this is not done, the microcomputer 70 generates a control signal for stopping the recording function, and if the control signal for recording stop is provided from the microcomputer 70, the transmission of data provided from the data source 80 is blocked. A recording protection unit 90 for stopping recording by the data; and data provided from the data source 80 through the recording protection unit 90 when the recording function is executed. Generating a recording waveform includes a recording waveform generator 100 to provide an optical pickup unit 10, and configuration.

On the other hand, the optical pickup section 10 outputs an optical signal for reading data from the disk D during reproduction, and outputs an optical signal for recording data on the disk D during recording (LD: shown). Not shown) and an LD driver (not shown) for driving the same.

In the data recording control apparatus of the digital video disc player configured as described above, the operation at the time of executing the recording function is as follows.

When predetermined data is provided from the data source 80 that provides data for recording through the write prevention unit 90, the recording waveform generating unit 100 is based on the data provided from the data source 80. The corresponding recording waveform is generated and provided to the LD driver constituting the optical pickup section 10.

Then, the LD driving unit drives the LD in accordance with the waveform signal provided from the recording waveform generating unit 100 to record data on the disk surface.

As described above, the optical pickup unit 10 records data on the disc, and focus error detection unit 20, tracking error detection unit 30, and recording confirmation unit 40 for the light reflected and picked up at the same time as recording. To provide.

Accordingly, the focus error detection unit 20 detects the amount of light reflected from the optical pickup unit 10 and reflected by the main beam of the LD at the same time as the recording, and generates a focus error signal based on the tracking error. The detection unit 30 detects the amount of light provided reflected by the side beam of the LD at the same time as the recording from the optical pickup unit 10 and generates a tracking error signal based on the amount of light.

In addition, the recording check unit 40 detects the light amount of the reflected light provided from the optical pickup unit 10 and checks whether or not the recording is performed well by comparing with the reference light amount at the time of the preset recording OK, and confirming the confirmation signal. Occurs.

The servo adjusting unit 50 generates a focus adjustment signal according to the output signals of the tracking error detecting unit 30 and the recording checking unit 40, and the servo control unit 60 provides the focus error provided from the focus error detecting unit 20. The control signal for focus and tracking servo is provided to the optical pickup unit 10 according to the signal, the tracking error signal provided from the tracking error detection unit 30, and the servo adjustment signal of the servo adjustment unit 50, thereby providing the focus and data at the time of data recording. Enable tracking servo.

The microcomputer 70 maintains or stops recording of data provided from the data source 80 according to the focus error signal and the tracking error signal provided from the focus error detector 20 and the tracking error detector 30. In general, the microcomputer 70 jumps to the write prevention unit 90 when the level of the tracking error signal becomes higher than or equal to the preset reference level because the optical pickup unit 10 jumps by a predetermined distance in the track which is the current record. The write operation is stopped by generating a control signal to block data input from the data source 80.

However, the occurrence of the above-described tracking error signal above the reference level does not only occur during the track jump of the optical pickup unit 10, but also when scratches or defects occur on the disc surface. In this case, the microcomputer 70 stops the recording operation.

As a result, in the conventional recording control apparatus as described above, even when scratches or defects occur on the disc by the track length at which error correction is possible (most scratches or defects are error correctable lengths). The problem that the recording operation is stopped due to the occurrence of the reference level or more occurs.

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 provide an error correction or scratch on the disc surface as much as an error correctable length when performing a recording operation in a digital video disc recorder. An object of the present invention is to provide a data recording control apparatus of a digital video disc recorder capable of continuously recording data without stopping the recording operation.

According to a preferred embodiment of the present invention for achieving this object, an optical signal for recording data input from an external data source on a predetermined disk D and performing optical pickup for the recorded area to output the picked-up optical signal A focus error detection section for detecting a focus error from an optical signal picked up and output by the optical pickup section, a tracking error detection section for detecting a tracking error from an optical signal picked up and output at the optical pickup section, and the optical signal; A recording checking unit for detecting whether the data is well written by detecting the amount of light of the optical signal provided from the pickup unit and comparing it with a preset reference level signal, and according to an output signal of the recording checking unit and an output signal of the tracking error detecting unit A servo adjuster for generating an adjustment signal for adjusting tracking and focus servos; A servo control unit which provides a control signal for tracking and focus servo to the optical pickup unit according to an output signal of a focus error detection unit, a tracking error detection unit, and a servo adjustment unit, and transmits data provided from the data source for airflow; And a recording waveform generation section for blocking data to stop recording, and a recording waveform generation section for generating a recording waveform for the data provided through the recording prevention section from the data source and providing the recording waveform to the optical pickup section when the recording function is executed. A data recording control apparatus of a video disc recorder, comprising: a first comparator for comparing a focus error signal provided from the focus error detector with a preset reference focus error signal and generating a logic signal of 'high' or 'low' accordingly; And the tracking error detection unit. A second comparator for comparing the provided tracking error signal with a preset reference tracking error signal and generating a logic signal of 'high' or 'low' according to the preset reference tracking error signal; and logic provided from the first comparator and the second comparator The data recording operation is controlled according to a signal, but when the tracking error signal is larger than the reference tracking error signal and the focus error signal is smaller than the reference focus error signal, a control signal is generated to the write prevention unit to generate data of the data source. It characterized in that it further comprises a microcomputer to stop the recording function by blocking the.

1 is a block diagram showing a data recording control apparatus of a conventional digital video disc recorder.

Fig. 2 is a block diagram of a data recording control apparatus of a digital video disc recorder according to a preferred embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

10: optical pickup unit 20: focus error detection unit

30: tracking error detection unit 40: recording confirmation unit

50: servo control unit 60: servo control unit

70,130: microcom 80: data source

90: write prevention unit 100: recording waveform generation unit

110: first comparison unit 120: second comparison unit

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

2 is a block diagram showing a data recording control apparatus of a digital video disc recorder according to a preferred embodiment of the present invention.

As shown in FIG. 2, the data recording control apparatus according to the present invention includes an optical pickup unit 10, a focus error detection unit 20, a tracking error detection unit 30, a recording confirmation unit 40, and a servo adjustment unit 50. And a servo control unit 60, a write prevention unit 90, a recording waveform generation unit 100, a first comparison unit 110, a second comparison unit 120, and a microcomputer 130. On the other hand, the data source 80 is for providing data to be recorded from the outside with the data recording apparatus according to the present invention.

When a recording function key signal is input from a key input unit (not shown) to start the recording function, and at the same time, predetermined data is provided through the write protection unit 90 from a data source 80 that provides data for recording. The recording waveform generating unit 90 generates a corresponding recording waveform based on the data provided from the data source 80 and provides the recording waveform to the LD driver (not shown) constituting the optical pickup unit 10.

Then, the LD driver drives the LD (not shown) in accordance with the waveform signal provided from the recording waveform generating unit 100 to record data on the disk surface.

As described above, the optical pickup unit 10 records data on the disc, and focus error detection unit 20, tracking error detection unit 30, and recording confirmation unit 40 for the light reflected and picked up at the same time as recording. To provide.

Accordingly, the focus error detection unit 20 detects the amount of light reflected from the optical pickup unit 10 and reflected by the main beam of the LD at the same time as the recording, and generates a focus error signal based on the tracking error. The detection unit 30 detects the amount of light provided reflected by the side beam of the LD at the same time as the recording from the optical pickup unit 10 and generates a tracking error signal based on the amount of light.

In addition, the recording check unit 40 detects the light amount of the reflected light provided from the optical pickup unit 10 and checks whether or not the recording is performed well by comparing with the reference light amount at the time of the preset recording OK, and confirming the confirmation signal. Occurs.

The servo adjusting unit 50 generates a focus adjustment signal according to the output signals of the tracking error detecting unit 30 and the recording checking unit 40, and the servo control unit 60 provides the focus error provided from the focus error detecting unit 20. The control signal for focus and tracking servo is provided to the optical pickup unit 10 according to the signal, the tracking error signal provided from the tracking error detection unit 30, and the servo adjustment signal of the servo adjustment unit 50, thereby providing the focus and data at the time of data recording. Enable tracking servo.

Meanwhile, according to the present invention, the first comparator 110 detects and provides the focus error detected and provided by the focus error detector 20, that is, the maximum value of the focus error that can be controlled by the servo controller 60. According to the present invention, a 'high' or 'low' logic signal is generated. For example, if the focus error detected by the focus error detector 20 is greater than the reference focus error, the 'high' signal is smaller than or equal to 'low'. 'Signal to the microcomputer 130.

In addition, the second comparator 120 compares the tracking error detected and provided by the tracking error detector 30 with a preset reference tracking error, that is, the maximum value of the tracking error controllable by the servo controller 60. A logic signal of 'high' or 'low' is generated. For example, if the tracking error detected by the tracking error detection unit 30 is greater than the reference tracking error, the 'high' signal is smaller than or equal to the 'low' signal. 130).

Accordingly, the microcomputer 130 controls the recording function by combining the logic signals provided from the first comparator 110 and the second comparator 120. A low signal from the first comparator 110 When a 'high' signal is provided from the second comparator 120, that is, the tracking error is out of the control range and the focus error is within the control range, the control signal is generated and recorded by the write prevention unit 90. The prevention unit 90 blocks the data provided from the data source 80, and otherwise controls the data to be continuously recorded.

That is, the microcomputer 130 stops recording only when the optical pickup unit 10 jumps on the track due to disturbance or the like, and when scratches or defects occur within the error correctable range on the disc, that is, When both the first and second comparators 110 and 120 are provided with the 'high' signal, the recording function is controlled to continue.

In detail, FIG. 3 is a waveform diagram of a focus error signal and a tracking error signal when a recording operation is performed smoothly, and FIG. 4 is a waveform diagram of a focus error and tracking error signal when a scratch or a defect occurs on a disc surface. 5 is a waveform diagram of a focus error and tracking error signal when the optical pickup section 10 jumps due to disturbance on a track.

That is, as shown in FIG. 4 and FIG. 5, when there is a scratch or a defect on the disk surface, not only the tracking error but also the focus error is out of the reference level, and the optical pickup unit 10 on the track is simply disturbed. In case of jumping, only the tracking error is out of the reference level.

That is, as described above, the present invention utilizes the difference between the tracking error and the focus error signal that occurs when the track jump of the optical pickup unit 10 and when there is a scratch or a defect on the disk surface.

As described above, in the present invention, when the recording function is executed in a digital video disc player, the recording operation is stopped only when a track jump occurs while executing the recording function on a predetermined track, and the scratch on the disk is within an error correctable range. Alternatively, when a defect occurs, the recording function can be maintained.

Claims (2)

An optical pickup section 10 for recording data input from the external data source 80 onto a predetermined disc D and outputting the picked-up optical signal by performing optical pickup for the recorded area; A focus error detector 20 for detecting a focus error from an optical signal picked up and output by 10), a tracking error detector 30 for detecting a tracking error from an optical signal picked up and output by the optical pickup 10, and A recording check unit 40 for checking whether the data is well written by detecting an amount of light of the optical signal provided from the optical pickup unit 10 and comparing it with a preset reference level signal; and the recording check unit 40 A servo adjustment unit 50 for generating an adjustment signal for adjusting tracking and focus servo according to an output signal of the tracking error detection unit 30 and an output signal of the tracking error detection unit 30, the focus error detection unit 20, and tracking unit The control signal for tracking and focus servo to the optical pickup unit 10 according to the output signals of the automatic detection unit 30 and the servo adjustment unit 50 and from the data source 80. A write protection unit 90 for transferring the data to be recorded on the disc D and blocking the data to stop recording, and the write protection unit 90 from the data source 80 when a recording function is executed. In the data recording control apparatus of the digital video disc recorder comprising a recording waveform generating unit 100 for generating a recording waveform for the data provided through the optical pickup unit 10 to provide to the optical pickup unit, A first comparator 110 for comparing a focus error signal provided from the focus error detector 20 with a preset reference focus error signal and generating a logic signal of 'high' or 'low' accordingly; A second comparator 120 which compares a tracking error signal provided from the tracking error detector 30 with a preset reference tracking error signal and generates a logic signal of 'high' or 'low' accordingly; The data write operation is controlled according to the logic signals provided from the first comparator 110 and the second comparator 120, wherein the tracking error signal is larger than the reference tracking error signal, and the focus error signal is the reference signal. And a microcomputer (130) which stops the recording function by generating a control signal to the write protection unit (90) to block the data of the data source (80) when the focus error signal is smaller than the focus error signal. Data record control device of recorder. The method of claim 1, wherein the microcomputer 130 maintains the data recording function when the tracking error signal is larger than the reference tracking error signal and the focus error signal is larger than the reference focus error signal. A data recording control device of a digital video disc recorder.

Images