KR0157556B1 - Track division signal producing apparatus of digital vcr - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a device for generating a tracking signal of a digital BC, and more particularly, to a digital signal for a pilot signal generation device for generating a track division signal of a pilot signal for recording in accordance with a frequency characteristic of a track. The present invention selects and records a signal having a frequency component close to the signal input during recording according to the F0, F1, and F2 track classification signals, and records the frequency characteristic information of the recorded track, unlike the conventional analog VCR during playback. By obtaining the tracking to provide a more smooth tracking operation can be performed.

Description

Digital V-Track classification signal generator

1 is a track arrangement diagram for one frame of a D-VCR.

2 is a conceptual diagram for explaining a frequency characteristic of a track.

3 is a block diagram showing an apparatus for generating a track classification signal of digital BCs according to a preferred embodiment of the present invention.

4 is a detailed view of the 24/25 modulating means 40 of FIG.

FIG. 5 is a timing diagram for explaining generation of a track classification signal during operation of the controller of FIG.

* Explanation of symbols for main parts of the drawings

31,33: A / D converter 32: video signal processor

34: audio signal processor 35: the adder

36: error correction processing unit 37: control unit

38: amplifier 40: 24/25 modulation means

41,42: Bit insert 43,44: Precoder

45,46: delay unit 47: spectrum controller

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a tracking device of a digital VRL, and more particularly, to a digital VRL generating a track segment signal for distinguishing each track to record a video signal received according to the frequency characteristics of the track during 24/25 modulation. A track classification signal generator.

In general, VCRs (Video Cassette Recorder) have a narrower track width of 1/4 inch than conventional analog VCRs and do not have a separate control track for tracking. Therefore, it is difficult to perform a smooth tracking operation with an existing analog VCR tracking device.

Accordingly, an object of the present invention is to select and output a signal having a frequency component close to the signal input at the time of 24/25 modulation by using different frequency characteristics of the D-VCR track in the digital VLC. The present invention provides a device for generating a track signal of a digital VLC capable of performing a smooth tracking operation during recording by recording.

The above-described feature of the present invention is a video recording and reproducing apparatus for recording video signal data received on a magnetic recording medium on which video signal data is recorded and reproducing the recorded video signal. A track that outputs a first signal based on the signals of, outputs a second signal according to a synchronization signal of the first signal, and generates a third signal that is toggled at each edge of the second signal to distinguish a predetermined other track. A control unit for generating a division signal, and a first modulation data modulated by adding a 0 th bit and a second modulated data modulated by adding a first bit during 24/25 modulation recording the video signal. There is provided a track separation signal generation apparatus for digital VLC including 24/25 modulation means for selecting one according to the track separation signal.

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

There are three types of TV broadcasting methods: NTSC (National Television System Committee), PAL (Phase Alternation by Line), and SECAM (Sequential Couleur A Memoire). According to such a broadcasting method, the track structure of the D-VCR also changes.

1 is a track arrangement diagram for one frame of the D-VCR. In general, for NTSC 525 (H) / 60 (㎐) TV system (1st), 10 tracks, PAL or SECAM 625 (H) / 50 (㎐) TV system (1st) In the case of (b), one frame consists of 12 tracks. Where H is the number of scan lines and ㎐ is the vertical frequency. 2 shows the different frequency characteristics of each track.

2 is a conceptual diagram showing the frequency characteristics of the track. In FIG. 2, the horizontal axis of the graph showing each frequency characteristic represents frequency (MHz), and the vertical axis represents level (㏈). FIG. 2 (a) shows F0 track characteristics without pilot frequency components. 2 (b) and 2 (c) show frequency characteristics of the F1 track and the F2 track. Here, the second (b) diagram shows a first pilot signal S1 having a low frequency component f1, and the third (b) diagram shows a second pilot signal S2 having a high frequency frequency component f2. ).

Therefore, FIG. 3 is a block diagram showing the track division signal generating apparatus of the digital VC that constitutes the apparatus of the present invention for utilizing different frequency characteristics for each track as described above.

The video signal and the audio signal are input to the first A / D converter 31 and the second A / D converter 33, respectively. The first A / D converter 31 receiving the video signal transmits the horizontal sync signal H (horizontal sync), the vertical sync signal V (vertical sync), and the even / odd signal to the controller 37. Output Here, in the case of the 525 / 60TV system, as shown in FIG. 1, the first track of the zero pilot frame has an F1 signal, and the first track of the first pilot frame has an F2 signal. Therefore, to distinguish this, a pulse having a period of one frame, that is, an even / odd signal is output. The video signal processor 32 compresses the digitally converted video signal received from the first A / D converter 31 in units of frames and outputs it to the adder 35. In addition, the voice signal processor 34 processes the voice signal received from the second A / D converter 33 and outputs the signal to the adder 35. The error correction processor 36 receives the video and audio signals synthesized in the adder 35 and corrects the errors in track units. The control unit 37 generates a pilot frame pulse, a head switching pulse and a track classification signal and inputs the reference signal of the signal processing to the 24/25 modulating means 40. The 24/25 modulator 40 receives the error corrected data from the error correction processor 36 according to the signal processing reference signals of the controller 37, that is, three sets of one byte (8 bits) of data, that is, three bytes ( 24 bits) is inserted into one bit for each data of 24 bits, and 0 or 1 is selected for the inserted one bit of data. A detail of the 24/25 modulating means 40 is shown in FIG. In FIG. 4, 24-bit data applied from the error correction processor 36 is simultaneously applied to the 0-bit inserter 41 and the 1-bit inserter 42. As shown in FIG. In this way, the data converted into 25 bits by one bit are converted into the first precoder 43 connected to the rear end of the 0-bit inserter 41 and the second precoder 44 connected to the rear end of the 1-bit inserter 42. This reduces the error propagation between bits. Output data of each precoder is applied to the spectral controller 47. The spectrum controller 47 controls the input signal of the output of the first precoder 43 and the output of the second precoder 44 according to the track separation signals from the control unit 37, that is, the F0, F1, F2 classification signals. Select data with near frequency component and output selection control signal to switch SW. In addition, the first delay unit 45 and the second delay unit 46 delay the signals that have been temporarily applied to adjust the timing until the selection control signal of the spectrum controller 47 is applied. The data of the audio signal or video signal modulated by the 24/25 modulation means 40 is amplified by the amplifier 38 and recorded in the bitstream state in the video signal sector and the audio signal sector on the tape track, respectively.

FIG. 5 is a timing diagram for explaining generation of a track classification signal during operation of the controller of FIG. The present invention will be described in more detail with reference to FIG. The control unit 37 receives a horizontal sync signal (H; horizontal sync), a vertical sync signal (V; vertical sync), and an even / odd signal from the first A / D converter 31 that receives an image signal. Licensed. In addition, the controller 37 receives a pilot frame signal for distinguishing each frame (figure 5). Then, at the edge of the pilot frame signal, a frame reset signal, which is a signal processing reference of the video signal processor 32, is generated (figure 5 (b)). The control unit 37 outputs the track reset signal in synchronization with each track in accordance with the frame reset signal (figure 5 (c)). Then, a head switching pulse VHS that is toggled for each track reset pulse is generated (figure 5 (d)). The control unit 37 inverts the head switching pulse VHS to generate a F0 track signal having a f0 pilot component (figure 5). On the other hand, the control unit 37 is a signal inverting the signal (figure 5 (bar)) in which the f0 signal is divided in two (figure (figure 5)), the F0 track signal and the negative logic ( NAND) to generate an F1 track signal (figure 5). On the other hand, the F2 track signal is generated by negatively multiplying the signal obtained by dividing the F0 track by two (figure 5 (figure)) and the F0 track signal (figure 5 (figure)) (figure 5 (figure)). Therefore, when the control unit 37 outputs the track segment signal to match the frequency component of the signal recorded by the 24/25 modulator 40 during signal recording, the spectrum controller 47 of the 24/25 modulator 40 During 24/25 modulation, one of the two signals is selected according to the track separation signal from the control unit 37 among the data modulated by adding the 0th bit and the modulated data by adding the first bit. In addition, the 24/25 modulator 40 receives the F1 and F2 track separation signals and operates as described above.

Accordingly, the present invention records the frequency characteristic information of a recorded track unlike a conventional analog VCR when recording and reproducing signals according to the characteristics of tracks having different frequency characteristics at the time of 24/25 modulation. Gained provides the benefit of smoother tracking.

Claims (4)

A video recording and reproducing apparatus for recording video signal data received on a magnetic recording medium having video signal data recorded thereon and reproducing the recorded video signal, the first recording method comprising: a first signal based on predetermined signals included in a video signal applied from the outside A control unit for outputting a signal, outputting a second signal according to a synchronization signal of the first signal, generating a third signal toggled at each edge of the second signal, and generating a track division signal for distinguishing a predetermined other track; ; When 24/25 modulation for recording the video signal, one of the first modulated data modulated by adding a 0 bit and the second modulated data modulated by adding a first bit is selected according to the track classification signal of the controller. A digital V-track track separation signal generating device comprising 24/25 modulation means. The first track of claim 1, wherein the control unit inverts the third signal to generate a reference pilot signal, and negatively multiplies the signal obtained by dividing the reference pilot signal by two, and the first pilot component having a first pilot component. And generating a second track selection signal having a second pilot component by inversely multiplying the reference pilot signal by generating a selection signal and inverting the signal obtained by dividing the reference pilot signal by two. Division signal generator. The digital V according to claim 1, wherein the 24/25 modulator comprises a spectral controller for selecting and outputting a signal having a frequency component close to a signal input during recording according to the track division signal. Signal track generation device of the seed. 2. The apparatus of claim 1, wherein the first signal is a frame reset signal which is a reference signal of an image compression process, the second signal is a track reset signal generated by synchronizing with the frame reset signal, and the third signal is the track reset signal. A digital V-track track separation signal generator, characterized in that the head switching pulse toggled every time.