KR19980061651A - Data recording controller and method of digital video disc recorder - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for controlling data recording of a digital video disc recorder, wherein the MPEG encoder 30 receives a motion vector used for data compression and determines a value of the motion vector. A motion vector discrimination unit 220 for generating respective discrimination signals for the case of '0' and not; A buffer 200 for buffering and outputting an audio signal input from the outside; A comparison unit 210 for comparing the input audio signal provided through the buffer 200 with a reference signal of a predetermined level and generating the comparison signal; And a microcomputer 10 for controlling to stop or maintain the recording function according to the discrimination signal provided from the motion vector discriminator 220 and the compare signal provided from the comparator 210.

Therefore, when the recording function is executed in the digital video disc player, the present invention can automatically stop the recording function if an audio signal and a video signal are not input for a preset time, thereby preventing unnecessary data from being recorded on the disc. There is.

Description

Data recording controller and method of digital video disc recorder

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital video disk recorder, and in particular, when executing a recording function in a digital video disk recorder, the presence or absence of data inputted is automatically detected when data is not input for a predetermined time. A data recording control apparatus and method for a digital video disc recorder for stopping a recording function.

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, the optical disc used for the playback and recording functions in the optical disc player is a play-only type in which the user can only play information, such as a CD, CD-ROM, and video disc, depending on its function and use. The recorded information can be divided into an additional recording type that can be read many times but not erased and rewritten, and an erased rewrite type that can repeatedly record, erase and reproduce the information.

Play-only type CD is already replacing the existing LP record board in the sound industry, CD-ROM which is a medium that can be searched when necessary by recording a large amount of information that needs to be widely spread such as encyclopedia, and recently in Korea Video discs and the like, which are rapidly expanding, have already been put into practical use and are in the dissemination stage. Additional recordable optical discs can be used for hospitals and large documents that need to store information such as X-rays, NMR-CTs, ultrasound tomography, and patient care cards. It is used for necessary public offices and mineral veins such as mines and oil fields.

The erasing rewritable optical disc has a magneto-optical type and a phase change type. The phase change type is recorded using a crystalline / amorphous reversible change in the process of heating and cooling the micro part of the medium using a laser. I am using a method to read it.

In general, recording of a magneto-optical optical disk causes the coercive force of the heated micro part to be reduced when the magnetic thin film unidirectionally oriented to the thin film surface is momentarily heated to near the Curie temperature by a laser focused light pulse. At this time, only the laser irradiation part heated by the weak magnetic field applied in the direction opposite to the medium magnetization direction is reversed. When the laser pulse is turned off and cooled to room temperature, only this part remains as a stable inverse magnetic domain bit and information is recorded.

The erasing is performed by heating the portion where the information is recorded by the laser beam, and then applying the direction of the external magnetic field at the time of cooling as opposed to at the time of recording to have the original magnetization direction.

On the other hand, reading of the recorded information is performed by using a laser light and a polarizer which are weaker than at the time of recording. When the linearly polarized light is reflected from the surface of the vertically magnetized material, the polarization direction is left with respect to the polarization direction of the incident light when the linearly polarized light is reflected from the surface of the perpendicular magnetized material Use the magneto-optical Kerr effect which rotates to the right and the right, respectively. That is, the polarization direction of the reflected light is rotated counterclockwise when the magnetization direction of the material is downward, and clockwise when it is upward, so that the reflected light passes through the two reflected beams with the analyzer set in advance in a direction that hardly passes the reflected polarization in the unrecorded portion. Then, the reflected light of the unrecorded part has a weak light quantity, and the reflected light of the recorded part passes through the analyzer and is converted into a strong signal of light, which is converted into a digital signal '0' and '1' by using a light detecting element. Will be read.

As described above, a system for recording, erasing, and reproducing the erase rewritable optical disc is commonly referred to as a digital video disk recorder (DVDR).

On the other hand, in a recordable optical disc, a pregroove is formed in a spiral shape in advance, and a land portion is formed between the pregroove and the pregroove, and data can be recorded in the pregroove and the land portion. In the pregroove or land portion, a sync code or absolute address is pre-recorded in the form of a wobble or pit. A recordable area except for an area where the sync code or absolute address is pre-recorded is called a program area. do.

In addition, in order to record data on the recordable optical disc described above in the DVDR, the disc is rotated at a constant linear speed by using the sync code and the absolute address reproduced by reproducing the pre-recorded area, that is, the area where the sync code and the absolute address are recorded. Normalized data should be recorded while controlling the speed and confirming the recording position.

In addition, in order to execute the recording function in the DVDR as described above, the user must input the recording function key signal to set the DVDR to the recording mode, and also input audio and video data to be recorded through an external input terminal, To stop recording, press the record stop key and input the stop key signal.

However, as described above, conventionally, when a recording function is executed to record predetermined audio and video data on an optical disc, when audio and video data are not input, for example, even when there is no more input data. Until the user presses the recording stop key to input the stop key signal, there is a problem that unnecessary noise data may be recorded on the optical disk by continuing to execute the recording function.

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 automatically record when data is not input in recording predetermined audio and video data on an optical disc in a digital video disc recorder. The present invention provides a data recording control apparatus and method for a digital video disc recorder capable of stopping the function.

According to a preferred embodiment of the present invention for achieving this object, a laser diode is provided which emits light for data reading and data recording from a predetermined disk to perform optical pickup on a predetermined disk to reproduce recorded data. And an optical pickup unit for recording the input data, an A / D converter for converting audio and video signals input from the outside into digital data, and digital video and audio data digitally converted by the A / D converter in MPEG compression format. An MPEG encoder for encoding according to the present invention, a modulator for adding an error correction bit to the audio and video data compressed by the MPEG encoder and modulating it in a predetermined manner, and recording the video and audio data modulated by the modulator on a disc. A recording waveform generating section for generating a recording waveform for A digital video disc recorder for controlling a recording function according to the presence or absence of data input when a recording function is executed in a digital video disc recorder including a laser diode driving unit for driving the laser diode to record a recording waveform generated by the voice portion. In the data recording control apparatus, a motion vector used for data compression is received by the MPEG encoder to determine a value of a motion vector, and a case in which the value of the motion vector is '0' or not A motion vector discrimination unit for generating each discrimination signal, a buffer for buffering and outputting the audio signal input from the outside, and an input audio signal provided through the buffer are compared with a reference signal of a predetermined level. A comparator for generating a comparison signal and the motion vector plate And a microcomputer for controlling a recording function for recording the input data on a predetermined optical disc in accordance with the discrimination signal provided from the separate unit and the comparison signal provided from the comparing unit.

According to another preferred embodiment of the present invention for achieving this object, a laser diode is provided which emits light for data reading and data recording from a predetermined disk to perform optical pickup on a predetermined disk to reproduce recorded data. And an optical pickup unit for recording the input data, an A / D converter for converting audio and video signals input from the outside into digital data, and digital video and audio data digitally converted by the A / D converter in MPEG compression format. An MPEG encoder for encoding according to the present invention, a modulator for adding an error correction bit to the audio and video data compressed by the MPEG encoder and modulating it in a predetermined manner, and recording the video and audio data modulated by the modulator on a disc. A recording waveform generating section for generating a recording waveform for Digital video disc for controlling the recording function according to the presence or absence of input data when executing the recording function in the digital video disc recorder including the laser diode driving unit for driving the laser diode to record the recording waveform generated by the generation unit. In the data recording control method of the recorder, (a) when a recording function execution key signal is input, recording audio and video data input from the outside onto a predetermined optical disc; and (b) whether a recording stop key signal is input. (C) stopping the recording function when the recording stop key signal is input in step (b); and (d) if the recording stop key signal is not input in step (b). The value of the motion vector used for data compression at is '0' and there is no audio signal input. For a set time period by counting the liver and the motion vector value is '0', the further comprises the step of if there is no input of an audio signal stopping the recording function.

1 is a schematic block diagram of a typical digital video disc recorder.

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

3 is a flowchart of a data recording control method of a digital video disc recorder according to another preferred embodiment of the present invention.

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

5: key input unit 10: microcomputer

20: A / D converter 30: MPEG encoder

40: modulator 50: recording waveform generation unit

60: LD drive part 70: optical pickup part

200: buffer 210: comparison

220: motion vector discrimination unit

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

1 is a schematic structural block diagram showing a general digital video disc recorder.

As shown in FIG. 1, the digital video disc recorder includes a key input unit 5, a microcomputer 10, an A / D converter 20, an MPEG encoder 30, a modulator 40, and a recording. Waveform generator 50, laser diode (LD) driver 60, optical pickup unit 70, spindle motor 80, servo controller 90, amplifier 100, waveform equalization A unit 110, a data detection and synchronization unit 120, a demodulator 130, an MPEG decoder 140, and a D / A converter 150 are included.

The key input unit 5 provides a function key signal to the microcomputer 10 to execute a predetermined function. In addition, the microcomputer 10 generates a control signal according to the function key signal provided from the key input unit 10, and controls the operation of the digital video disc recorder as a whole.

On the other hand, the optical pickup unit 70 includes a laser diode (LD) 72, a polarization beam splitter 74, a quarter wave plate 76, an objective lens 79, and a light detector 78. do.

The LD 72 is driven in accordance with a drive signal of the LD drive unit 60 to be described later to emit light for recording data on a predetermined disk, and to output light for reading data from the predetermined disk. To release). The polarizing beam splitter 74 passes parallel components and reflects vertical components of the incident light, so that the light emitted from the LD 72 passes through the quarter wave plate 76, The light reflected by the four wavelength plate 76 is reflected in the vertical direction and provided to the light detector 78.

The quarter wave plate 76 makes the light passing through the polarization beam splitter 74 into a circular convex and provides it to the objective lens 79, and the light reflected from the disk D and passed through the objective lens 79 Is converted into linear light and provided to the polarizing beam splitter 74. In addition, the objective lens 79 focuses the light provided from the quarter wave plate 76 to provide focus on the disc D, and provides the light reflected from the disc D to the quarter polarizer 76. ) Finally, the photodetector 78 detects the amount of light of the optical signal reflected by the polarization beam splitter 74 and converts it into a current signal.

As a result, the optical pickup unit 70 performs optical pickup on a predetermined disk, reproduces the recorded data, detects and outputs the light amount of the read data, and records the input data on a predetermined disk to record.

Meanwhile, the A / D converter 20 converts analog audio and video signals input from the outside into digital data and provides them to the MPEG encoder 30. The MPEG encoder 30 encodes the digital video and audio data digitally converted by the A / D converter 20 based on the MPEG compression format. The discrete cosine transform, the quantization, the motion vector We use techniques such as motion estimation, motion compensation, and variable length coding to detect and use.

The modulator 40 adds error correction bits to the audio and video data compressed by the MPEG encoder 30 using a predetermined scheme, modulates the modulated data according to a predetermined modulation scheme, and provides them to the recording waveform generator 50.

In addition, the recording waveform generating unit 50 generates a recording waveform for recording on the disc according to the modulated video and audio data which has been modulated by the error correction bit added thereto, and provides the LD to the LD driving unit 60. . The LD driver 60 drives the laser diode 60 to record the recording waveform generated by the recording waveform generator 50.

Meanwhile, the servo controller 90 detects a focus error and tracking error signal in accordance with a current signal provided from the light detector 78, and controls the optical pickup unit 70 according to the detected error signal to smoothly reproduce and record. In addition, the spindle motor 80 is driven to rotate the disk D at a speed at which data can be read and written.

The amplifier unit 100 amplifies the reproduction signal provided from the light detector 78 to a predetermined level and provides the waveform equalizer 110 to the waveform equalizer 110. The waveform equalizer 110 reproduces the signal provided from the amplifier unit 100. The digital signal is easily detected by removing noise and interference from the signal, and then provided to the data detection and synchronization unit 120.

The data detecting and synchronizing unit 120 detects digital data of '1' and '0' from the output signal of the waveform equalizing unit 110, determines the timing at the time of detection, and performs phase synchronization, that is, PLL.

The demodulator 130 demodulates the digital data detected and provided by the data detector 120, performs error correction according to the error correction bits, and provides the demodulated data to the MPEG decoder 140.

The MPEG decoder 140 decompresses the demodulated and error-corrected compressed digital signal based on the MPEG compression format to the D / A converter 150, and then provides the D / A converter 150. ) Converts the decompressed digital signal from the MPEG decoder 140 into an analog signal and provides it to an external output terminal (not shown), for example, a speaker and a monitor.

On the other hand, according to the present invention, if the recording key signal is provided from the key input unit 5, and audio and video signals are provided from the outside, the A / D converter 20, the MPEG encoder 30, the modulator 40, The recording waveform generating unit 50, the LD driving unit 60, and the optical pickup unit 70 signal-process the audio and video signals inputted under the control of the microcomputer 10 so as to be able to record as described above, thereby providing a predetermined optical signal. The disc D is recorded.

FIG. 2 is a block diagram of a data recording control apparatus of a digital video disc recorder according to an exemplary embodiment of the present invention, and includes a buffer 200, a comparator 210, a motion vector discriminator 220, and a microcomputer 10. FIG. Included and configured.

That is, when the recording function is executed in the digital video disc player as described above, the motion vector discrimination unit 220 receives a motion vector used for data compression in the MPEG encoder 30 to obtain a value of the motion vector. In order to determine whether the motion vector provided from the MPEG encoder 30 is '0' and each determination signal is generated to the microcomputer 10, for example, the value of the motion vector is '0'. If not, the signal 'low' is provided to the microcomputer 10, and if '0', the signal 'high' is provided to the microcomputer 10. That is, when the motion vector is '0', there is no motion and the data of the previous frame and the data of the current frame are the same, that is, the still picture or the video data is not input.

Meanwhile, at the same time, the buffer 200 buffers an audio signal input from the outside and provides the buffer to the comparison unit 210, and the comparison unit 210 reads an input audio signal provided through the buffer 200. The comparison signal is generated by the microcomputer 10 in comparison with the reference signal of a predetermined level, which is used to determine whether an audio signal is input. That is, the comparator 210 provides a low signal to the microcomputer 10 when the audio signal input through the buffer 200 is larger than the reference signal, that is, when there is an audio signal input. If there is no signal input 'high signal to the microcomputer 10.

Accordingly, the microcomputer 10 controls the recording function being executed according to the discrimination signal provided from the motion vector discrimination unit 220 and the comparison signal provided from the comparator 210. There is no audio signal input, and the motion vector value is also provided. Is 0, that is, when the 'high' signal is provided from both the motion vector discrimination unit 220 and the comparator 210 for a predetermined time, the LD driver 60 and the optical pickup unit 70 are transferred. A control signal is generated to stop the recording function, and otherwise, the recording function is controlled to continue.

3 is a flowchart of a data recording control method of a digital video disc recorder according to another preferred embodiment of the present invention.

If a recording function execution key signal for recording predetermined data on the disk is input in step S10, in step S20 audio and video data input from the outside is recorded on the predetermined optical disk.

Thereafter, in step S30, it is determined whether a recording stop key signal for stopping the recording function executed in step S20 is input. If in step S30 a recording function stop key signal is input, the process proceeds to step S80. The recording function is stopped, and if the recording stop key signal is not input, the flow advances to step S40.

On the other hand, if the process proceeds from step S30 to step S40, in step S40 it is determined whether the value of the motion vector used for data compression in the MPEG encoder 30 is 0 and no input of the audio signal is detected. If it is determined in step S40 that the value of the motion vector is '0' and an input of the audio signal is not detected, the process proceeds to step S50 and otherwise returns to step S30.

When the process proceeds from step S40 to step S50, step S50 counts the time when the value of the motion vector is '0' and the input of the audio signal is not detected.

Thereafter, in step S60, it is determined whether the value of the motion vector is '0' for the preset time and no input of the audio signal is detected. In step S60, the value of the motion vector is '0' for the preset time. If the input of the audio signal is not detected, the process proceeds to step S80 to stop the recording function. Otherwise, the process proceeds to step S70, where the counted value, that is, the value of the counted motion vector is '0' and audio. Reset the undetected time of the signal to '0' and return to step S30 to perform the flow again.

As described above, when the recording function is executed in a digital video disc player, the present invention automatically stops the recording function when no audio signal and video signal are input for a preset time, thereby preventing unnecessary data from being recorded on the disc. It can work.

Claims (3)

An optical pickup unit having a laser diode 72 for emitting data for reading data from and recording data from a predetermined disk to perform optical pickup on the predetermined disk D to reproduce recorded data and to record input data. 70, an A / D converter 20 for converting audio and video signals input from the outside into digital data, and digital video and audio data digitally converted in the A / D converter 20 in an MPEG compression format. MPEG encoder 30 for encoding on the basis of the above, Modulator 40 for adding error correction bits to the audio and video data compressed by the MPEG encoder 30 and modulating in a predetermined manner, and Modulator 40 A recording waveform generation unit 50 for generating a recording waveform for recording the modulated video and audio data on a disc; and a recording waveform generated by the recording waveform generation unit 50. In order to execute the recording function in the digital video disc recorder including the laser diode driver 60 for driving the laser diode 72, the data recording of the digital video disc recorder for controlling the recording function in accordance with the presence or absence of the inputted data. In the control unit, The MPEG encoder 30 receives a motion vector used for data compression to determine a value of the motion vector, and each discrimination signal for the case where the value of the motion vector is '0' or not. A motion vector discrimination unit 220 for generating a; A buffer (200) for buffering and outputting the audio signal input from the outside; A comparator 210 for comparing the input audio signal provided through the buffer 200 with a reference signal having a predetermined level and generating the comparison signal; Data recording of a digital video disc recorder including a microcomputer 10 for controlling to stop or maintain the recording function according to a discrimination signal provided from the motion vector discriminator 220 and a comparison signal provided from the comparator 210. Control unit. The method of claim 1, wherein the microcomputer 10 compares the signal indicating that the motion vector is '0' and the input audio signal from the motion vector determining unit 220 and the comparator 210 to be smaller than a preset signal. And a control signal for stopping the recording function when a signal is simultaneously provided for a predetermined time period. An optical pickup unit having a laser diode 72 for emitting data for reading data from and recording data from a predetermined disk to perform optical pickup on the predetermined disk D to reproduce recorded data and to record input data. 70, an A / D converter 20 for converting audio and video signals input from the outside into digital data, and digital video and audio data digitally converted in the A / D converter 20 in an MPEG compression format. MPEG encoder 30 for encoding on the basis of the above, Modulator 40 for adding error correction bits to the audio and video data compressed by the MPEG encoder 30 and modulating in a predetermined manner, and Modulator 40 A recording waveform generation unit 50 for generating a recording waveform for recording the modulated video and audio data on a disc; and a recording waveform generated by the recording waveform generation unit 50. In order to execute the recording function in the digital video disc recorder including the laser diode driver 60 for driving the laser diode 72, the data recording of the digital video disc recorder for controlling the recording function in accordance with the presence or absence of the inputted data. In the control method, (A) recording audio and video data input from the outside onto a predetermined optical disc when a recording function execution key signal is input; (B) determining whether a recording stop key signal is input; (C) stopping the recording function when the recording stop key signal is input in step (b); (D) If the recording stop key signal is not input in step (b), the preset time is determined by counting the time when the value of the motion vector used for data compression in the MPEG encoder is '0' and no audio signal is input. Stopping the recording function if the value of the motion vector is '0' and there is no input of an audio signal during the data recording control method of the digital video disc recorder.