KR100236631B1 - Head drum for high quality recording and reproducing apparatus using standard vhs video tape - Google Patents

Abstract

According to the present invention, an input video signal of one field is alternately distributed for each line, separated into two fields, each separated signal is extended on a time axis, and converted into a signal of a low frequency band. Records on two channels of VHS videotape, overcomes the existing bandwidth limitations by standard VHS videotape and video head, and records in high quality without loss of frequency band. The present invention relates to a head drum of a high-definition recording apparatus using a standard VHS video tape, in which a head for a channel is mounted, wherein the head drum 10c according to the present invention records and records signals of two fields which have been subjected to extension after combination. The received signal is reproduced at a time difference by the main head 1c; and the subhead 2c; Hi-Fi heads 3c for recording / reproducing Hi-Fi audio signals are installed to have the same mounting angle (60 °), so that high-definition recording and reproduction of video signals and two video signals are performed. In addition to recording and playing back circles simultaneously, two pairs of heads are installed at a mounting angle of 120 °, so that even weight distribution can be achieved when mounting hi-fi audio heads, and thus rotational speed due to weight inequality It is a very useful invention that can minimize the deviation of.

Description

Head drum of high-definition burner using standard VHS videotape

The present invention relates to a head drum of a high-definition recording apparatus using a standard VHS video tape, and more particularly, to divide an input video signal of one field alternately per line, and to separate it into two fields. Each signal is extended on the time base to be converted into a signal of a lower frequency band, and then recorded on two channels of standard VHS videotape to overcome the bandwidth limitations of the existing standard VHS videotape and the video head without loss of frequency band. The present invention relates to a head drum of a high definition recording apparatus using a standard VHS video tape, in which a head for each two channel is mounted so as to record in high quality and reproduce the two recorded signals.

When recording a video signal received by using a normal video tape, because of the characteristics of the head and the video tape, only about 3 MHz band can be recorded without recording the entire NTSC video signal band of about 4.2 MHz. High-frequency signals with sudden signal changes will not record and play back. Therefore, the signal reproduced after recording has a lowered sharpness than the original video signal, thereby degrading the picture quality.

In order to solve the above problems, many researches have been conducted and are being conducted. Yoshitomi Nagaoka et al. Published two-channel recording V-CAL, and the method of enabling high-quality recording and playback by dividing and recording the received video signal into two-channel signals by Mitsuo et al. The Consumer Electronics Transition, Vol. 40, No. 3, was published as “V-AL of W-VHS” of a new system for multi-purpose recording including HDTV.

However, in the case of two-channel recording V-Cell such as “Yoshitomi Nagaoka”, the video signal can be recorded in high quality. In this method, the 1H video signal is extended to the 2H time zone, and the color burst signal, By time-dividing and selecting two color difference signals that are 2.7 times compressed and luminance signals that are 1.5 times extended, the time-base allocation area for color signals and luminance signals is reduced, and both visually less sensitive color difference signals are included in the time division selection. As a result, the luminance signal that greatly influences the image quality is not sufficiently extended, and the frequency band is not greatly reduced, so that the luminance signal of the high range is not recorded but lost. In the above method, in order to compensate for this disadvantage, the frequency modulated carrier to be recorded has to use a new high frequency without using the frequency modulated carrier used in the existing VRC, and accordingly, a new luminance and color signal processing signal must be designed. There is a problem in that a video tape of a medium capable of recording a higher band signal has to be manufactured.

In addition, the V-RS of "W-VHS" such as "Mitsuo" is a high quality broadcasting signal (HDTV), for example, for accommodating a signal whose luminance signal band is about five times the luminance signal band of the current standard VHS tape. In order to accommodate such a method, a completely new recording / playback apparatus has to be developed rather than a conventional recording / playback apparatus that is widely used and widely used. Expensive tapes, such as metal tapes with a much improved multi-coated thickness of 14.4 μm, should be used, and the recording heads would also have to use new heads with narrow gaps made of thin films. The problem of excessive price increase and input of high quality broadcasting signal source different from the current NTSC color TV broadcasting signal It will have a problem.

In order to solve the above problems, a high-definition recording apparatus has been proposed and applied by the present applicant to record and play back a video signal that is currently being broadcast using a standard VHS video tape in high quality without band loss. This necessitates a head drum including a head mounted and mounted at a specific angle.

Therefore, the present invention was created to meet the above needs, and is suitable for a high-definition recording apparatus capable of recording and playing back a video signal that is currently being broadcast using high-definition standard VHS videotape in high quality without band loss. It is to provide a head drum having a mounted head.

1 is a plan view of a preferred embodiment of a head drum of a high definition greenery apparatus using a standard VHS videotape according to the present invention,

2 is a block diagram showing a recording unit of the high-definition recording apparatus is used head drum according to the present invention,

FIG. 3 schematically shows a luminance signal and a color difference signal separately output by the video signal decoder of FIG.

FIG. 4 illustrates a process in which digital data having luminance and color difference information are separated in FIG.

5 shows waveforms synthesized at a time ratio of 4: 1 after digital data having luminance and color difference information are separated and processed;

6 is a diagram illustrating a form in which a video signal is recorded on a tape through a head drum of a high-definition recording apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

1c: main head 2c: subhead

3c: Hi-Fi head 10a: signal selector

10c: Head drum 20a: Video signal decoder

30a: Switch 41a, 42a: Analog-to-digital converter

50a: de-multiplexer

61a, 62,63a: memory

71a, 72a: multiplexer

80a: Field memory 91a, 92a: Digital to analog converter

100a: control unit 210,220: Y / C signal processing unit

The head drum of the high-definition recording apparatus using the standard VHS video tape according to the present invention for achieving the above object, in the head drum for recording two signals at the same time, a pair of main head and a pair of subhead Is configured to be mounted, it is characterized in that it is arranged so that the load is balanced with the other head mounted.

The head drum of the high-definition recording apparatus using the standard VHS video tape according to the present invention configured as described above, the signal is pre-pressured after the video signal of the two fields are combined and stretched through the main head, and the main head The delay signal delayed by a predetermined time until the subhead contacts the tape after the contact with the tape is recorded through the subhead.

Hereinafter, the configuration and operation of the preferred embodiment of the head drum of the high-definition recording apparatus using the standard VHS video tape according to the present invention will be described in detail.

1 is a plan view of a preferred embodiment of a head drum of a high-definition recording apparatus using a standard VHS videotape according to the present invention, wherein the head drum 10c records signals of two fields which have been subjected to stretching after post-combination. The signal includes: a main head 1c which reproduces with a parallax; and a subhead 2c; A Hi-Fi head 3c for recording / reproducing Hi-Fi audio signals is provided to have the same mounting angle (60 °).

2 is a diagram showing the configuration of a recording unit in a preferred embodiment of a high-definition recording apparatus using a standard VHS video tape in which a head drum according to the present invention is used, and selecting one of a plurality of input image signals and outputting them separately in luminance and color signals. A signal selector 10a; A video signal decoder 20a for separating only the luminance signal separated from the signal selector 10a and the color signal among the color signals into two color difference signals; A switching switch (30a) for alternately selecting and outputting the two color difference signals according to a control signal (CTL0); Analog / digital converters 41a and 42a for converting the analog luminance signal output from the video signal decoder 20a and the analog color difference signal alternately selected and output by the switching switch 30a into digital data, respectively; A demultiplexer (50a) for alternately distributing and outputting output data of the analog / digital converter (41a) for converting luminance signals into digital data according to the control signal (CTL0); Memory (61a, 62a) for storing both output data of the demultiplexer (50a); A memory (63a) for storing output data of the analog / digital converter (42a) for converting a color difference signal into digital data; A first multiplexer (71a) which sequentially selects data read out from the memory (61a) in which the luminance data is stored and the memory (63a) in which the chrominance data is stored at a predetermined time ratio according to a control signal (CTL1); The memory 62a in which the luminance data is stored and the data read in the memory 63a in which the chrominance data are stored are sequentially selected according to a control signal CTL2 at a predetermined time ratio, and are sequentially output. The memory 63a in which the chrominance data is stored is output. A second multiplexer 72a having a selective output point of < RTI ID = 0.0 >) < / RTI > A field memory (80a) for storing the output data of the second multiplexer (72a) for a predetermined time; A digital / analog converter (91a, 92a) for converting the output data of the first multiplexer (71a) and the data read from the field memory (80a) into analog signals and inputting them to a Y / C signal processor (210,220); And a controller 100a for outputting the control signals CTL0, CTL1, and CTL2 according to the input synchronization signal and adjusting the data storage time of the field memory 80a.

In the recording unit of the high-definition recording apparatus configured as described above, one of a plurality of video signals is first selected by the signal selector 10a to be separated into a luminance signal and a color signal, and the separated luminance signal causes the video signal decoder 20a. Passed as it is, the color signal is decomposed into two color difference signals RY and BY and output. The separated two color difference signals are alternately selected one by one by the switching switch 30a, wherein the alternate selection is controlled by the control signal of the controller 100a which is output in conjunction with the horizontal synchronization signal of the selected video signal. By CTL0. That is, the luminance signal and the color difference signal of the color difference signal decomposed by the video signal decoder 20a as shown in FIG. 3 are alternately outputted by the switching switch 30 as shown in FIG. The color difference signals alternately selected and output as a single signal are sampled by the analog / digital converter 42a according to an fsc (= 3.58 MHz) clock and stored in the memory 63a at the same speed. On the other hand, the selected luminance signal is also sampled by the analog / digital converter 41a according to 4fsc (= 14.32 MHz) clock and stored in the memories 61a and 62a at this rate, which is stored therein. The selection of is alternately selected by the control signal CTL0 interlocked with the horizontal synchronous signal of the controller 100a so that every other field is stored in the same memory. Accordingly, the data stored in the memories 61a and 62a become signals as shown in b of FIG. While the luminance data and the chrominance data are stored as described above, the controller 100a reads from the memories 61a, 62a, and 63a to time-division synthesize the luminance data and the chrominance data. The process is as follows. .

First, the control unit 100a applies a control signal CTL1 to the first multiplexer 71a to input an input terminal to a clock of 520f _h (520 X 15.748 ㎑ = 8.189 MHz) in the memory 63a in which the chrominance data is stored. The control signal CTL1 is inverted again by selecting and outputting data to be read by the data, and the data read by the 520f _h clock is selected and output from the memory 61a in which the luminance data is stored. The luminance data and the color difference data read out from the memories 61a and 63a by the clock frequency as described above are respectively 1.749 times (14.32MHz / 8.189MHz = 1.749), and 43.7% (3.58MHz / 8.189MHz = 0.437). It is compressed (2.28 times compressed), resulting in a signal such as c in FIG. Data having a signal value such as c in FIG. 4 is selected by the controller 100a at a time ratio such that the ratio of the chrominance signal to the luminance signal is 1: 4 so that the data of the signal as shown in FIG. The data is converted into an analog signal obtained by time-division combining the luminance signal and the color difference signal as shown in FIG. 5A by the digital-to-analog converter 91a.

:175H에 해당)이므로 상기 필드 메모리(80a)에 저장된 데이타는, 상기 주헤드(1c)를 통해 신호가 기록되기 시작한 시점으로 부터 정확히 11.1ms후에 기록시와 동일 속도로 독출되어 상기 디지탈/아날로그 변환기992a)에 의해 아날로그 신호로 변환되어 제5도의 (b)와 같은 휘도신호와 색차신호가 시분할 조합된 신호가 된다. 상기 조합된 신호는 앞서 설명한 과정과 동일하게 부Y/C신호처리부(220)를 거쳐 상기 부헤드(2c)를 통해, 현재 상기 주헤드(1c)에 의해 기록되고 있는 첫번재 필드신호에 이웃하여 영상트랙에 기록되게 된다. 전술한 과정에 의해 영상신호가 분해되어 테이프상에 기록된 형태를 도식화하여 제6도에 나타내었다. 제6도에서 ‘주’-A,-B는 상기 주헤드(1c)에 의해, ‘부’-A,-B는 상기 부헤드(2c)에 의해 기록된 것임을 나타낸다.When all the color difference data in the 1H signal is read out from the memory 63a in which the color difference data is stored and converted into a compressed signal, the controller 100a applies a control signal CTL2 to the second multiplexer 72a to apply the color difference data. After the compressed signal (d in FIG. 4) read out from the memory 63a stored therein is output through the second multiplexer 72a for a predetermined time, the control signal CTL2 is inverted so as to store the luminance data. The luminance signal (d in FIG. 2), which is extended and read out at 62a), is selected and output at the same time division ratio as above. In this way, the time division selected and output data is temporarily stored in the field memory 80a. The signal converted by the digital-to-analog converter 91a is frequency-modulated by a carrier having a conventional frequency in the existing Y / C signal processing unit 210 and recorded on the video tape by the main head 1c. The output data of the second multiplexer 72a corresponding to the luminance signal and the chrominance signal of the following field is 120 ° of the main head 1c and 120 ° for equal distribution of the head load mounted on the head drum 10c. Since the recording is performed by the subhead 2c having the difference in the mounting angles, a signal corresponding to a time interval in which the subhead 2c reaches the recording track after the main head 1c reaches the recording track of the tape. There is a need to delay. Therefore, the delay time corresponding to the 120 ° angle of the head drum is 11.1 ms (

175H), the data stored in the field memory 80a is read out at the same speed as at the time of recording exactly 11.1 ms after the signal starts to be recorded through the main head 1c, so that the digital-to-analog converter 992a) converts the analog signal into a signal obtained by time division combining the luminance signal and the color difference signal as shown in FIG. The combined signal is adjacent to the first field signal currently being recorded by the main head 1c through the subhead 2c via the sub Y / C signal processing unit 220 in the same manner as described above. It will be recorded on the video track. The video signal is decomposed by the above-described process, and the shape recorded on the tape is shown in FIG. In FIG. 6, 'main'-A, -B indicates that the main head 1c is recorded, and'sub'-A, -B is recorded by the subhead 2c.

While recording the video signal as described above, the Hi-Fi head 3c mounted between the main head 1c and the subhead 2c separately separates and inputs the audio signal into the tape in-depth. Done.

In the case of reproducing the video signal recorded as shown in FIG. 6, the signal reproduced by the main head 1c and the signal reproduced by the subhead 2c have a 11.1 ms time difference, so that the main head 1c is reproduced. The signal reproduced by is delayed by the time, and then, together with the signal reproduced by the subhead 2c, is restored to a signal of two fields of high quality through a reverse process during recording.

In addition, the head drum 10c according to the present invention configured as described above records two video signal sources through the main head 1c and the subhead 2c, respectively, and reproduces the two video signal sources. In the case of recording / reproducing, the video signal source input to the subhead 2c should be input after being delayed for 11.1 ms time compared to the signal input to the main head 1c. In the case of reproducing, the signals reproduced by the main head 1c and the subhead 2c may be simultaneously outputted after the Y / C signal processing without any delay.

The head drum of the high-definition recording apparatus using the standard VHS video tape according to the present invention, which is configured and acts as described above, not only makes it possible to record and reproduce high-definition recording and playback of video signals, and to simultaneously record and play two video signal sources. By installing the two pairs of heads at a mounting angle of 120 °, an equal distribution of weights is achieved when the hi-fi audio head is mounted, thereby minimizing the variation in rotational speed due to weight inequality.

Claims (1)

A pair of main heads installed opposite to each other in a head drum for simultaneously recording two different signals; A pair of subheads installed to face each other in order to reconstruct a video signal different from the video signal recorded by the pair of main heads; And a pair of voice heads installed opposite to each other and discharging the voice signal are mounted on one head drum, and are arranged at equal intervals and mounting angles so that the load is equalized.

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