KR100262752B1 - Data back-up apparatus using full-bandwidth of the composite video signal - Google Patents

Abstract

PURPOSE: A data back-up apparatus using full bandwidth of a composite video signal is provided to modulate the frequency of a luminance signal with an extended frequency band as a frequency band for a color signal at a data back-up so that many more back-up data are stored to a video tape having the same time length and also use a frequency modulating portion in common as selecting a modulation frequency varying portion varying a modulation frequency in the frequency modulation of a luminance signal. CONSTITUTION: The data back-up apparatus includes a data modulating portion(10), a luminance signal/color signal dividing portion(20), first and second signal switching portions(30a,30b), a low band converting portion(40), a frequency modulating portion(60), a modulation frequency varying portion(65) and a magnetic recording portion(80). The data modulating portion receives the back-up data for making back-up according to selection of a data back-up mode to store a back-up data and modulates into a form of a composite video signal to generate a pseudo composite video signal. The luminance signal/color signal dividing portion divides a real luminance signal from a real color signal in the real composite video signal according to selection of a recording mode to record the real composite video signal. The first signal switching portion switches an output of the data modulating portion when the data back-up mode is selected and the divided real luminance signal to the luminance signal/color signal dividing portion when the recording mode is selected. The low band converting portion converts the real color signal divided from the luminance signal/color signal dividing portion into a low frequency band. The second signal switching portion switches an output of the low band converting portion when the recording mode is selected and the ground when the data back-up mode is selected. The frequency modulating portion receives an output of the first signal switching portion and modulates frequency into the first frequency band modulation when the recording mode is selected and receives an output of the first signal switching portion and modulates frequency into the second frequency band summed the first frequency band and the low frequency band when the data back-up mode is selected. The modulation frequency varying portion is combined to the frequency modulating portion and converts the modulation frequency of the frequency modulating portion into the first frequency band and the second frequency band respectively as varying a resistance value corresponding to selection the recording mode and the data back-up mode. The magnetic recording portion overlays an output of the low band converting portion and an output of the second signal switching portion to record in a video tape.

Description

Data backup device using full bandwidth of composite video signal

The present invention relates to a video tape recorder having a data back-up function. In particular, the present invention relates to a video tape recorder by modulating data to be backed up (hereinafter referred to as backup data) in the form of a composite video signal. The present invention relates to a data back-up apparatus using full-bandwidth of the composite video signal.

In general, a video tape recorder is a device for recording or playing a composite video signal on a video tape. Recently, a method of using the video tape recorder as a data backup device for storing and preserving a large amount of data has been proposed. Data backup device using video signal is introduced.

The data backup apparatus using the composite video signal receives backup data from a computer, adds a horizontal synchronization signal and a vertical synchronization signal at appropriate intervals, modulates the composite video signal into a composite video signal, and stores the data on a video tape. In this case, the pseudo composite video signal obtained by modulating the backup data is the same as when recording the actual composite video signal input from the outside. Therefore, the luminance signal is frequency modulated, and the color signal is low-frequency converted and then recorded on the video tape by a low-conversion recording method in which the two are superimposed.

In the video tape recorder as described above, the backup data is expressed only as a luminance signal among the pseudo composite video signals obtained by modulating it. That is, only the luminance signal-including the horizontal synchronization signal and the vertical synchronization signal-exists in the pseudo composite image signal, but no color signal exists. This means that the frequency band allocated for the color signal can be used to record the luminance signal during data backup. In other words, the luminance signal can be frequency-modulated and recorded in the frequency band extended by the frequency band for the color signal. Means.

In view of the fact that the wider the frequency bandwidth during frequency modulation, the better the ability to express the original signal in both quantitative and quantitative terms, as described above, if the luminance signal is frequency modulated and recorded in the extended frequency band, Obviously, more backup data can be stored on video tapes of the same length of time.

However, since the video tape recorder also modulates and records the luminance signal in the same frequency band as in the case of recording a general composite video signal during data backup, a large loss occurs in the amount of data recorded on the video tape.

Therefore, the present invention has been devised to solve such a problem, and the present invention has been made in view of the above-described points, and the present invention provides a color signal during data backup so that a larger amount of backup data can be stored in a video tape of the same time length. An object of the present invention is to provide a data backup apparatus using the full bandwidth of a composite video signal in which a luminance signal is frequency-modulated and recorded in a frequency band extended by a frequency band.

It is still another object of the present invention to provide a data backup apparatus using the full bandwidth of a composite video signal in which a frequency modulating unit can be used jointly by adopting a modulation frequency varying unit for varying a modulation frequency in frequency modulating a luminance signal. have.

1 is a block diagram showing a detailed configuration of a preferred embodiment of a data backup device using the full bandwidth of the composite video signal according to the present invention;

2 is a view showing a frequency band for a luminance signal in the recording mode in the present invention.

3 is a diagram illustrating a frequency band for a luminance signal in the data backup mode in the present invention.

<Explanation of symbols for main parts of drawing>

10: data modulator 20: luminance signal / color signal separation unit

30a: first signal switching unit 30b: second signal switching unit

30c: third signal switching unit 40: low pass conversion unit

50: low pass filter 60: frequency modulator

65 modulation frequency variable portion 71 first band pass filter portion

72: second band pass filter unit 80: magnetic recording unit

81: recording amplifier 82: magnetic head

100: data backup system

In order to achieve the above object, a data backup apparatus using the full bandwidth of a composite video signal according to the present invention receives a backup data to be backed up in the form of a composite video signal when a data backup mode for storing backup data is selected. A data modulator for modulating a pseudo composite video signal; A luminance signal / color signal separation unit that separates an actual luminance signal Y and an actual color signal C from an actual composite image signal according to a recording mode for recording an actual composite image signal; A first signal switching unit for switching the output of the data modulation unit when the data backup mode is selected and switching the actual luminance signal separated by the luminance signal / color signal separation unit when the recording mode is selected; A low pass converting unit for receiving a real color signal separated from the luminance signal / color signal separating unit and performing a low pass conversion to a predetermined low frequency band; A second signal switching unit for switching the output of the low-pass converter when the recording mode is selected, and switching the ground when the data backup mode is selected; When the recording mode is selected, the output of the first signal switching unit is input and frequency-modulated into the first frequency band. When the data backup mode is selected, the second frequency obtained by inputting the output of the first signal switching unit and the first frequency band and the low frequency band are added together. A frequency modulator for frequency modulating the frequency band; A modulation frequency variable unit coupled to the frequency modulator to change the modulation frequency of the frequency modulator into a first frequency band and a second frequency band by varying a corresponding resistance value as the recording mode and the data backup mode are selected; And a magnetic recording section for recording the output of the second signal switching section and the output of the frequency modulation section on the videotape.

According to the present invention of this aspect, if the data of the pseudo composite video signal during the data backup is actually modulated and recorded in the frequency band extended by the frequency band for the color signal, a larger amount of backup to the video tape of the same time length Data can be saved.

Hereinafter, a preferred embodiment of a data backup apparatus using the full bandwidth of the composite video signal according to the present invention will be described with reference to FIG. 1.

1 is a block diagram 100 illustrating a preferred embodiment of a data backup apparatus using the full bandwidth of a composite video signal according to the present invention.

In the data backup apparatus using the full bandwidth of the composite video signal according to the present invention, as shown in FIG. 1, a data backup mode for storing backup data provided from a host computer (not shown) is selected. A data modulator 10 receiving the backup data to be modulated into a complex video signal to generate a pseudo composite video signal;

A luminance signal / color signal separation unit 20 for separating an actual luminance signal Y and an actual color signal C from the actual composite image signal according to a recording mode for recording an actual composite image signal;

A first signal switching unit 30a for switching the output of the data modulation unit 10 when the data backup mode is selected, and switching the actual luminance signal separated by the luminance signal / color signal separation unit 20 when the recording mode is selected;

A low pass converter 40 which receives the actual color signal separated from the luminance signal / color signal separator 20 and converts the low frequency band into a predetermined low frequency band;

A low pass filter 50 for filtering the output of the low pass converter 40 to pass only a signal in a predetermined low frequency band;

A second signal switching unit 30b for switching the output of the low pass filter unit 50 when the recording mode is selected, and switching the ground when the data backup mode is selected;

When the recording mode is selected, the output of the first signal switching unit 30a is input and frequency-modulated into the first frequency band. When the data backup mode is selected, the output of the first signal switching unit 30a is input and the first frequency band is received. A frequency modulator (60) for frequency modulating the second frequency band by adding the low frequency band and the low frequency band;

Modulation coupled to the frequency modulator 60 to change the modulation frequency of the frequency modulator 60 into a first frequency band and a second frequency band, respectively, by varying the corresponding resistance values as the recording mode and the data backup mode are selected. Frequency variable section 65;

A first band pass filter 71 receiving the output of the frequency modulator 60 and performing band pass filtering to the first frequency band;

A second band pass filter 72 which receives the output of the frequency modulator 60 and performs band pass filtering to the second frequency band;

A third signal switching unit 30c for switching the output of the first band pass filter unit 71 when the data backup mode is selected, and switching the output of the second signal switching unit when the recording mode is selected; And

And a magnetic recording unit 80 for recording the output of the low pass filter unit 50 and the output of the third signal switching unit 30d on a video tape (not shown).

Here, the modulation frequency variable unit 65 is connected to the frequency modulation unit 60 to switch the signal applied to the first switching terminal when the recording mode is selected, and the signal applied to the second switching terminal when the data backup mode is selected. Select switching unit SW1 for switching the switching unit, and one side is connected to the power supply Vcc, and the other side is connected to the first switching terminal of the selection switching unit SW1 so that the modulation frequency of the frequency modulation unit 60 is the first frequency band. The first resistor R1 and the other side are connected to the power supply Vcc and the other side are connected to the second switching terminal of the selection switching unit SW1 so that the modulation frequency of the frequency modulation unit 60 is changed to the second frequency. And a second resistor R2 for changing to a band.

The operation of the preferred embodiment of the data backup device using the full bandwidth of the composite video signal configured as described above will be described in detail with reference to the accompanying drawings.

In the preferred embodiment of the present invention, when the operation mode of the data backup system 100 is the data backup mode, it is noted that the pseudo composite video signal does not include the color signal component. There is a feature that is directly input to the frequency modulator 60 through the first signal switching unit 30a without passing through the color signal separation unit 20.

In particular, the first signal switching unit 30a, the second signal switching unit 30b, the third signal switching unit 30c, and the selection switching unit SW1 perform the same signal switching function according to the operation mode. The backup system 100 serves to separate a path via the actual composite video signal and a path through the backup data. Accordingly, the data backup system 100 of the present invention can simultaneously support a recording function for a normal real composite video signal and a backup function for backup data.

The operation mode of the data backup system 100 according to the present invention includes a recording mode for recording an actual composite video signal and a data backup mode for storing backup data provided from a host computer (not shown).

First, a case in which an operation mode of the data backup system 100 according to the present invention is set to a recording mode will be described.

As the recording mode is selected as the operation mode of the data backup system 100 according to the present invention, the luminance signal / color signal separation unit 20 may output the actual luminance signal Y and the actual color signal C from the actual composite image signal. ).

Accordingly, the first signal switching unit 30a switches the actual luminance signal separated by the luminance signal / color signal separation unit 20, and the frequency modulation unit 60 shows the first signal switching unit as shown in FIG. The output of 30a is input and frequency modulated into the first frequency band B1.

In this case, the modulation frequency variable part 65 forms a connection with the first resistor R1 through the selection switching unit SW1 so that the modulation frequency of the frequency modulation unit 60 is changed to the first frequency band.

Thereafter, the first band pass filter 71 receives the output of the frequency modulator 60 to perform band pass filtering on the first frequency band, and the third signal switch 30c performs the first band pass filter. The output of (71) is switched.

Meanwhile, as the recording mode is selected as the operation mode of the data backup system 100 according to the present invention, the low-pass converter 40 receives a real color signal separated by the luminance signal / color signal separator 20 and has a predetermined low frequency band. Low-pass conversion, the low pass filter 50 filters only the signal passing through a predetermined low frequency band of the output of the low-pass converter 40, the second signal switching unit 30b is a low pass filter 50 Switch the output of and output it.

Thereafter, the magnetic recording unit 80 superimposes the output of the second signal switching unit 30b and the output of the third signal switching unit 30d on the video tape.

That is, the luminance signal Y filtered through the first bandpass filter unit 71 and the color signal C filtered through the lowpass filter unit 50 are superimposed on each other and then amplified by the recording amplifier 81 so that the magnetic head ( 82) is recorded on the videotape.

This means that when the operating mode of the system is set to the recording mode, both the luminance signal Y and the color signal C of the actual video signal are recorded on the video tape.

Next, a case in which the operation mode of the data backup system 100 according to the present invention is set to the data backup mode will be described.

As the data backup mode for storing the backup data provided from the host computer (not shown) is selected as the operation mode of the data backup system 100 according to the present invention, the data modulator 10 backs up the data to be backed up. The data is received and modulated in the form of a composite video signal to generate a pseudo composite video signal.

In other words, the data modulator 10 generates a pseudo image signal in which a horizontal synchronous signal and a vertical synchronous signal are added to backup data transmitted from a computer (not shown).

Accordingly, the first signal switching unit 30a switches the output of the data modulation unit 10, and the frequency modulation unit 60 inputs the output of the first signal switching unit 30a as shown in FIG. 3. The first frequency band and the low frequency band are subjected to frequency modulation in the second frequency band B2.

At this time, the modulation frequency variable unit 65 forms a connection with the second resistor R2 through the selection switching unit SW1 so that the modulation frequency of the frequency modulation unit 60 is changed to the second frequency band.

The reason why the output of the data modulator 10 does not need to perform the luminance signal / color signal separation (so-called Y / C separation) through the luminance signal / color signal separation unit 20 is a pseudo composite image signal during data backup. It is focused on the fact that does not contain color signal components.

Thereafter, the second band pass filter 72 receives the output of the frequency modulator 60 to perform band pass filtering on the second frequency band, and the third signal switch 30c performs the second band pass filter. The output of 72 is switched.

In other words, the output of the data modulator 10 is input to the frequency modulator 60, which is fed from the frequency modulator 60 to a predetermined second frequency band B2 encompassing the first frequency band B1 and the low frequency band. After the frequency modulation, the second bandpass filter unit 72 filters the second frequency band B2. In other words, the luminance signal Y is frequency modulated and filtered in the second frequency band B2, which has an increased bandwidth than in the recording mode.

On the other hand, as the data backup mode is selected as the operation mode of the data backup system 100 according to the present invention, the second signal switching unit 30b is switched to ground and outputs a ground signal.

Thereafter, the magnetic recording unit 80 superimposes the output of the low pass filter unit 50 and the output of the third signal switching unit 30d on the video tape.

As described above, when the operation mode of the data backup system 100 according to the present invention is set to the data backup mode, no signal is combined with the luminance signal because the second signal switching unit 30b outputs a ground signal. As a result, the color signal can be eliminated as a result. Accordingly, since there is no signal of the color signal band, the band of the luminance signal obtained by converting the backup data signal is extended to the color signal band.

Therefore, only the luminance signal filtered through the second band pass filter unit 72 is amplified by the recording amplifier 81 and recorded on the video tape through the magnetic head 82, thereby backing up using the full bandwidth of the composite image signal. Data can be recorded on videotape.

That is, in the data recording mode, only the luminance signal Y of the pseudo video signal is recorded on the video tape. However, since the frequency band B2 for the luminance signal Y at this time is extended by the low frequency band for the color signal C, a larger amount of backup data is stored in the video tape of the same time length.

Meanwhile, in a preferred embodiment of the present invention, the first band pass filter part 50, the first band pass filter part 71, the second band pass filter part 72, and the third signal switch part 30 c are provided. It is well known that the embodiment may be omitted depending on the situation as it is not an essential component but a component for improving the performance of the present invention.

In this case, the magnetic recording unit 80 directly receives the output of the low-order converter 40 and the output of the frequency modulator 60 and superimposes them on the video tape.

Terminologies used herein are terms defined in consideration of functions in the present invention, which may vary according to the intention or customs of those skilled in the art, and the definitions should be made based on the contents throughout the present application. will be.

In addition, since the present invention has been described through the preferred embodiment of the present invention, in view of the technical difficulty aspects of the present invention, those having ordinary skill in the art can easily be different from another embodiment of the present invention. Since modifications may be made, it is obvious that both the embodiments and modifications cited in the above description belong to the claims of the present invention.

As described above, the luminance signal (Y) and the color signal (chrominance (C)) are separated from the composite video signal, and the luminance signal is frequency modulated and the low frequency conversion of the color signal is performed by superimposing the two. According to the method, the pseudo composite image signal obtained by modulating the data to be backed up is recorded and stored on a video tape, but in frequency modulating the luminance signal, a modulating frequency variable part for varying the modulation frequency is adopted so that the frequency modulating part can be jointly used. According to a data backup apparatus using the full bandwidth of a composite video signal according to the present invention, a frequency band in which a luminance signal, which is actually effective among pseudo pseudo image signals obtained by modulating data to be backed up during data backup, is extended by a frequency band corresponding to a color signal. Video of the same length of time There is an effect which can not only store a greater amount of backup data in the tape dramatically reduces the errors that may be caused by a limited bandwidth.

Claims (4)

A data modulator for receiving a backup data to be backed up and modulating the backup data to generate a pseudo composite video signal when a data backup mode for storing backup data is selected; A luminance signal / color signal separator for separating an actual luminance signal Y and an actual color signal C from the actual composite image signal according to a recording mode for recording an actual composite image signal; A first signal switching unit for switching the output of the data modulation unit when the data backup mode is selected, and switching the actual luminance signal separated by the luminance signal / color signal separation unit when the recording mode is selected; A low-pass converter for low-pass converting the actual color signal separated from the luminance signal / color signal separator into a predetermined low frequency band A second signal switching unit for switching the output of the low-pass converter when the recording mode is selected, and switching the ground when the data backup mode is selected; When the recording mode is selected, the output of the first signal switching unit is input and frequency-modulated into a first frequency band. When the data backup mode is selected, the output of the first signal switching unit is received and the first frequency band and the low frequency are received. A frequency modulator for frequency modulating the second frequency band by adding bands; A modulation frequency coupled to the frequency modulator to change the modulation frequency of the frequency modulator into the first frequency band and the second frequency band by varying a corresponding resistance value as the recording mode and the data backup mode are selected. Variable part; And And a magnetic recording unit for superimposing the output of the low-pass converter and the output of the second signal switching unit on a videotape. The method of claim 1, A first band pass filter configured to receive an output of the frequency modulator and perform band pass filtering to the first frequency band; A second band pass filter configured to receive an output of the frequency modulator and perform band pass filtering to the second frequency band; And A third signal switching unit for switching the output of the first band pass filter unit when the data backup mode is selected, and switching the output of the second band pass filter unit when the recording mode is selected, And a data backup device using the full bandwidth of the composite video signal, further comprising between the frequency modulator and the magnetic recording unit. The method of claim 1, A low pass filter unit for low pass filtering the output of the low pass conversion unit to the predetermined low frequency band, The data backup device using the full bandwidth of the composite video signal, characterized in that further comprising between the low-pass converter and the second signal switching unit. The method of claim 1, wherein the modulation frequency variable portion, A selection switching unit connected to the frequency modulation unit to switch a signal applied to a first switching terminal when the recording mode is selected, and to switch a signal applied to a second switching terminal when the data backup mode is selected; A first resistor unit having one side connected to a power supply and the other side connected to a first switching terminal of the selection switching unit to change a modulation frequency of the frequency modulating unit to the first frequency band; And And a second resistor unit having one side connected to the power supply and the other side connected to the second switching terminal of the selection switching unit to change the modulation frequency of the frequency modulating unit to the second frequency band. Data backup device using full bandwidth.

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