JP2939965B2 - Video signal recording method and video signal recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal recording method and a video signal recording device, and more particularly to a device suitable for recording an information signal together with a video signal.

[0002]

2. Description of the Related Art It has been known that a VITC signal representing a time code is inserted into a vertical blanking period of a video signal and recorded for editing the video signal. This V
ITC signal has pedestal level (0IRE) and 80IR
A signal form corresponding to a binary number represented by E is performed, and is FM-modulated as a part of a video signal and recorded on a magnetic tape.

In order to improve the S / N ratio of a video signal, pre-emphasis is usually applied to emphasize the high frequency components, and information above the limiter level is discarded by a limiter to prevent overmodulation. FM modulation was performed.

[0004]

Therefore, since the information above the limiter level is discarded after the pre-emphasis of the VITC signal, the waveform cannot be completely reproduced. In particular, the VITC signal is problematic because it has rising and falling edges having high amplitude high frequency components between 0 IRE and 80 IRE. Therefore, an object of the present invention is to solve such a problem.

[0005]

SUMMARY OF THE INVENTION The present invention provides the following structure to solve the above problems.

A first invention is a video signal recording method for recording a video signal in which an information signal expressed in a binary state is inserted into a predetermined line, wherein the information signal is changed from one state to the other. At least the information signal separated from the video signal is subjected to a modulation that changes via an intermediate value when the state changes to the information signal, and is inserted into the video signal, and the modulated information signal is inserted. A video signal recording method characterized in that the video signal is subjected to emphasis for emphasizing high frequency components, the amplitude is limited to a predetermined level, FM modulation is performed, and the video signal is recorded on a recording medium. is there.

A second invention is a video signal recording apparatus for recording a video signal in which an information signal represented in a binary state is inserted into a predetermined line, wherein the information signal separated from the video signal is recorded. A signal obtained by subjecting a signal to at least modulation for interpolating an intermediate value on its rising edge and falling edge.
TCI information signal generating means for generating a CI information signal, emphasis means for emphasizing a high frequency component of a signal obtained by inserting the TCI information signal into the video signal subjected to predetermined recording processing, and an output of the emphasis means Limiter means for limiting the amplitude of the signal to a predetermined level, FM modulation means for performing FM modulation on an output signal of the limiter means, and recording means for recording the output signal of the FM modulation means on a recording medium. A feature of the present invention is to provide a video signal recording device.

A third invention is a video signal recording apparatus for recording a video signal in which an information signal represented in a binary state is inserted into a predetermined line, wherein the predetermined line related to the video signal is recorded. And a TCI converter for outputting a TCI signal obtained by performing time-axis multiplexing on a time axis of a luminance signal and a chrominance signal related to an output signal of the dividing means and outputting a TCI signal obtained by time-axis multiplexing. And TC obtained by subjecting the information signal separated from the video signal to at least modulation for interpolating an intermediate value at a rising edge and a falling edge thereof.
A TCI information signal generating means for generating an I information signal;
Emphasis means for emphasizing high frequency components of a signal having a CI signal and the TCI information signal; limiter means for limiting the amplitude of an output signal of the emphasis means to a predetermined level; It is an object of the present invention to provide a video signal recording apparatus, comprising: an FM modulator for performing modulation; and a recorder for recording an output signal of the FM modulator on a recording medium.

A fourth invention is a video signal recording device for recording a video signal in which an information signal represented in a binary state is inserted into a predetermined line, wherein the predetermined line related to the video signal is recorded. And a TCI converter for outputting a TCI signal obtained by performing time-axis multiplexing on a time axis of a luminance signal and a chrominance signal related to an output signal of the dividing means and outputting a TCI signal obtained by time-axis multiplexing. And TC obtained by subjecting the information signal separated from the video signal to at least modulation for interpolating an intermediate value at a rising edge and a falling edge thereof.
TCI information signal generating means for generating an I information signal, correction signal generating means for generating a correction signal for correcting transmission characteristics, and high frequency of the TCI signal, the TCI information signal, and a signal having the correction signal. Emphasis means for emphasizing the component, limiter means for limiting the amplitude of the output signal of the emphasis means to a predetermined level, FM modulation means for performing FM modulation on the output signal of the limiter means, and output signal of the FM modulation means And a recording means for recording the video signal on a recording medium.

According to a fifth aspect of the present invention, there is provided a video signal recording apparatus for recording a video signal in which an information signal expressed in a binary state is inserted into a predetermined line, wherein the predetermined line related to the video signal is recorded. A dividing unit that deletes upper and lower lines including and divides the system into two systems, a time-axis emphasis unit that emphasizes a high-frequency component in a time-axis direction related to an output signal of the dividing unit with a low-frequency component, A vertical emphasis means for enhancing a vertical high frequency component of the output signal of the time axis emphasis means by comparing with a low frequency component, and a luminance signal and a chrominance signal of the output signal of the vertical emphasis means. TCI conversion means for outputting a TCI signal obtained by axial compression and time axis multiplexing, and inserting an intermediate value into a rising edge and a falling edge of the information signal separated from the video signal. And TCI information signal generating means for generating a TCI information signal obtained by at least applying tone, the TCI
Horizontal emphasis means for enhancing a horizontal high frequency component of a signal having the signal and the TCI information signal by comparing it with a low frequency component, and adjusting the amplitude of the output signal of the horizontal emphasis means to a predetermined level. Video signal recording apparatus, comprising: a limiter for limiting the frequency of the output signal to a limiter, an FM modulator for performing an FM modulation on an output signal of the limiter, and a recorder for recording the output signal of the FM modulator on a recording medium. Is provided.

A sixth invention is a video signal recording apparatus for recording a video signal formed by inserting an information signal expressed in a binary state into a predetermined line, wherein the predetermined line related to the video signal is recorded. A dividing unit that deletes upper and lower lines including and divides the system into two systems, a time-axis emphasis unit that emphasizes a high-frequency component in a time-axis direction related to an output signal of the dividing unit with a low-frequency component, A vertical emphasis means for enhancing a vertical high frequency component of the output signal of the time axis emphasis means by comparing with a low frequency component, and a luminance signal and a chrominance signal of the output signal of the vertical emphasis means. TCI conversion means for outputting a TCI signal obtained by axial compression and time axis multiplexing, and inserting an intermediate value into a rising edge and a falling edge of the information signal separated from the video signal. TCI information signal generating means for generating a TCI information signal obtained by applying at least a tone, correction signal generating means for generating a correction signal for correcting transmission characteristics, the TCI signal, the TCI information signal, and the correction signal Horizontal emphasis means to enhance the horizontal high frequency component of the signal having the compared with the low frequency component,
Limiter means for limiting the amplitude of the output signal of the horizontal emphasis means to a predetermined level; FM modulation means for performing FM modulation on the output signal of the limiter means; and recording the output signal of the FM modulation means on a recording medium. A video signal recording device comprising a recording unit.

[0012]

FIG. 1 is a waveform diagram of an information signal, FIG. 2 is a waveform diagram for explaining a line of an information signal inserted into an HD signal,
FIG. 3 is a block diagram for explaining a main part of the video signal recording apparatus according to one embodiment of the present invention, FIG. 4 is a conceptual diagram for explaining the operation of the dividing means, FIG. 5 is a waveform diagram of a TCI signal,
6 is a timing chart for explaining the operation of the modulating means, FIG. 7 is a waveform diagram of the TCI information signal, FIG. 8 is a tape pattern, and FIG. 9 is a main part of the video signal reproducing apparatus according to one embodiment of the present invention. It is a block diagram for explaining. This embodiment relates to a video signal recording / reproducing apparatus for recording / reproducing a high-definition video signal. Here, an HD signal will be described as an example of a high-definition video signal. The HD signal, which is an output signal of the video signal recording / reproducing apparatus according to the present embodiment, has an information signal on a predetermined line. The signal recording / reproducing device is used as an input signal. Therefore, first, for this information signal, and then for the recording system,
Finally, the reproduction system will be described.

(Information Signal) FIG. 1A shows lines of an information signal inserted into a luminance signal (hereinafter abbreviated as "Y signal") relating to an HD signal. The contents of the information signal include a preamble signal (8 bits) for synchronizing clocks during reproduction, as shown in FIG.
A synchronization signal (8 bits) for identifying the start of data,
To manage a data signal (56 bits) representing the type of video signal, a time code signal (32 bits) representing time information, an error correction signal (16 bits) for performing error detection and correction during reproduction, and a recording level. (Referenced to 8 bits). The normal level of the level reference signal is 50 IRE, and the bits of the other signals correspond to “0” for 20 IRE and “1” for 80 IRE. FIG. 2B is a line diagram of an information signal inserted into a luminance signal related to the NTSC signal.

The data signal is composed of 7 words in units of 8 bits. The first word relates to the format of the video signal and includes aspect ratio information (for example, 16: 9,
4: 3 identification), image display format information (for example, letterbox or normal identification), and track format information (for example,
HD, NTSC, EDTV, etc.) and telecine information (for example, identification of the same frame).
The second word is a program I representing a program number.
D information is stored. The third word includes audio information (for example, identification of stereo, mono, bilingual, etc.), editing information (for example, identification of editing start, editing end, editing, etc.), and correction signal information (for example, correction signal ), And control signal information (for example, identification of the duty ratio of a control signal such as VISS or VASS). The fourth and fifth words are text information and represent character information or the like by a so-called closed caption method. The sixth and seventh words are spare words for ensuring future expandability.

The time code signal is composed of 4 words in units of 8 bits. The first word is a frame number incremented by one frame, and the second word is “second”.
, The third word represents “minute”, and the fourth word represents “hour”.

Next, the line on which the information signal is inserted is shown in FIG.
This will be described with reference to the waveform diagram of the HD signal shown in FIG. The numbers shown in the figure represent line numbers, and the first line starts from the start of the vertical synchronization signal of the odd field.

Here, the line on which the information signal is to be inserted is:
Since the vertical blanking period and the horizontal synchronization signal period including the vertical synchronization signal may be deleted by the Hi-Vision device, it is necessary to insert a level standard signal in the effective scanning line, and since the information signal is not a picture signal, 8% to 1% of all scanning lines so as not to be displayed on the monitor screen
It is necessary to consider that the monitor has an overscan characteristic of 0%.

Considering these points, the lines on which the information signal is inserted are 41 to 66 lines of the HD signal.
Line, 532-557 line, 603 line-628
One line or a plurality of lines among the lines and 1095 lines to 1120 lines.

Since the number of scanning lines that the monitor actually overscans varies for each device, information signals are inserted into scanning lines that are effective scanning lines and are unlikely to appear on the screen. It is more desirable. In a studio standard HD signal, the number of effective scanning lines is 1035, and the effective pattern period is 41 lines or more.
557 lines and 603 lines to 1120 lines. On the other hand, in the MUSE decoder output signal, there are 1032 effective scanning lines, and the effective picture period is 42 lines to
557 lines and 604 to 1119 lines.

Therefore, 41,557,603,1120
The line and the 42, 604, 557, and 1119 lines are effective scanning lines, and are lines satisfying the above-described conditions that are unlikely to appear on the screen. Therefore, 41, 42,
It is desirable to insert the information signal into one or more of the 557, 603, 604, 1119, and 1120 lines.

Further, 41 lines and 603 lines are effective scanning lines of the HD signal of the studio standard, and
This is a line that is not an effective scanning line of the USE decoder output signal. Therefore, assuming that the HD signal is not encoded into the MUSE signal, it is desirable to insert the information signal into 41 lines and / or 603 lines.

Therefore, the video signal magnetic recording / reproducing apparatus according to this embodiment inserts an information signal into the 603 line of the HD signal and outputs the signal. The input HD signal is changed to the 603 line or the 604 line in consideration of the output signal of the MUSE decoder. It is assumed that an information signal is inserted.

(Recording system) Referring to FIG.
A recording system of a video signal recording / reproducing apparatus for recording / reproducing an SC signal will be described. In the figure, an input Y is transmitted from a transmission line (not shown).
Signal aa (luminance signal) and input PB, PR signals bb, cc
(Color signal) are supplied to the AGC means 1 to 3, respectively. Here, the input Y, PB, and PR signals are signals compliant with the domestic Hi-Vision signal standard.
This is a signal converted from the B signal.

Y = 0.7154G + 0.0721B + 0.2125R PB = 0.5389 (−0.7154G + 0.9279B−0.2125R) PR = 0.6349 (−0.7154G−0.0721B + 0.7875R) And the above AGC means 1 to 3 perform A / D conversion. The amplitude level of each signal is corrected based on the level reference signal in the information signal relating to the output signal 4a of the output unit 4; if the level reference signal is inserted in the 603 line, this is given the highest priority; When the level reference signal is not inserted in the line 603 and the level reference signal is inserted in the line 604, the level reference signal is used, and the lines 603 and 60 are used.
If no level reference signal is inserted in any of the four lines, the level is corrected based on the amplitude level of the horizontal synchronization signal.

Then, the input Y, PB, PR signals aa, bb, and cc having the normal amplitude levels are converted into A / D converters 4.
To the dividing means 7 through. This dividing means 7 is an A / D converter for input Y, PB, PR signals aa, bb, cc.
It plays the role of dividing the output signals of the converters 4 to 6 into two systems. This division processing will be described with reference to FIG. 4. The input Y, PB, PR signals aa, bb, cc shown at the upper left in FIG.
(HD signal), the number of effective scanning lines of the MUSE signal (1032
This signal is divided into two signals shown in the lower left and lower right parts of the figure, and is divided into first Y and PR signals 7b and 7a for even lines and odd lines. The second Y and PB signals 7c and 7d are obtained. Although the PR signal for the odd-numbered line and the PB signal for the even-numbered line have been deleted, since these signals have high line correlation, they are subjected to line-sequential demodulation during reproduction.

The output signal of the dividing means 7 is supplied to time axis emphasis means 8 to 11, where the high frequency components in the time axis direction are emphasized based on signals of a plurality of past frames. However, the time axis emphasis means 8 to 11
Is controlled by an editing information signal 19b for identifying the start of editing, the end of editing, and the editing in progress, and the processing of the video signal after the editing point is performed ignoring the video signal of a plurality of frames before the editing point which is a past frame.

Then, the first PR signal 7a and the second PB
The output signals 8a and 11a of the time axis emphasis means 8 and 11 relating to the signal 7d are first and second TCI conversion means 15 and 16 via vertical emphasis means 12 and 14 for emphasizing high frequency components in the vertical direction. Supplied to

On the other hand, the output signals 9a, 1 of the time axis emphasis means 9, 10 relating to the first and second Y signals 7b, 7c.
0a is supplied to the vertical emphasis means 13, where both input signals are rearranged in line order and integrated, and the signal obtained by emphasizing the high frequency components in the vertical direction is again divided into even lines and odd lines. To the first and second TCI conversion means 15 and 16, respectively.

Then, the first and second TCI processing means 1
Reference numerals 5, 16 denote first and second TCI signals 15a, 15a,
16a is supplied to first and second selecting means 17 and 18, respectively.

Then, the first and second selecting means 17 and 18
Are the first and second TCI signals 15a and 16a
And a TCI information signal 19a, a correction signal 20a, and a blanking signal 21a, which will be described later, to generate first and second recording signals 17a and 18a shown in FIG. That is, the first and second TCI signals 15a and 16a are selected in the period T1 shown in FIG. 3, the blanking signal 21a is selected in the period T2, and the TCI information signal 19a is selected in the period T3.
Is selected, and the correction signal 20a is selected in the period T4. In FIG. 5, a signal indicated by "SW" is a switching signal for securing a margin for switching the magnetic head, a signal indicated by "V" is a vertical synchronization signal,
The signal indicated by “DA” is a TCI information signal, and “C”
The signal indicated by “AL” is a correction signal. In this way, the selecting means 15 and 16 are changed to the first and second TCI converting means 15 and
The signals provided after 16 are not correlated in the time axis direction and the vertical direction, such as the TCI information signal 19a and the correction signal 20a, except for the signal period, so that emphasis in the time axis direction and the vertical direction is excessive. This is because information may be lost by a limiter at the subsequent stage due to emphasis on a high frequency component.

Here, the recording information signal generating means 19 for generating the TCI information signal 19a will be described. The recording information signal generating means 19 includes an output signal 4 of the A / D converter 4.
After the information signal and the editing information signal 19b are supplied, the information signal is identified using the predetermined level (for example, the maximum level of the horizontal synchronizing signal) as a threshold, and the information signal is subjected to processing such as error correction and detection. The rewriting of the editing information inserted in the third word in the data signal is performed based on the newly supplied editing information signal 19b. The program ID information, time code information, correction signal information, and the like are also replaced with new information if they are changed. After a new error correction signal is added, special modulation is performed.

This modulation converts the signal represented by the binary value to 3
By converting into a value, a spike level immediately after an edge generated as a result of emphasizing high frequency components in horizontal emphasis means 24 and 25 described later is reduced, and limited by limiter means 26 and 27 for preventing overmodulation. This does not exceed the limiter level. FIG. 6A specifically shows a clock signal, with six periods corresponding to one bit of the signal shown in FIG. 6B. Then, the signal changes from "1" to "0" as shown in FIG.
, 50,20,
If bits of “0” are continuous so as to be 20,20,20,20IRE, 20,20,20,20,2
If the signal changes from "0" to "1" so that it becomes "1" so that it becomes 0,20IRE, it becomes 50,80,80,80,80,80, IRE for each sample of the clock signal. As described above, when the bits of “1” are continuous, every sample of the clock signal
Modulation is performed so as to be 80,80,80,80,80,80IRE. The modulated signal becomes the signal shown in FIG. 3D at the output of the horizontal emphasis means 24 and 25 described later, and does not exceed the limiter level, so that the edge information is lost by the limiter means 26 and 27. There is no. The signal thus modulated is used as the TCI information signal 19a as the first and second signals.
Are supplied to the selecting means 17 and 18. When the information signal represented by the binary state is changed from one state to the other state through an intermediate value, modulation is performed.
A 50 IRE which is an intermediate value of the edge amplitudes (20 IRE to 80 IRE) is interposed between the rising edge and the falling edge of the information signal 19a to form a ternary signal.

Next, the correction signal generating means 20 for generating the correction signal 20a is constituted by a plurality of ROMs and the like.
Different types of correction signals stored in respective ROMs are sequentially selected and output for each frame. This correction signal includes
For example, a ramp signal for correcting linearity between two systems, a gray scale signal for adjusting a DC level and an amplitude level between two systems, a multi-burst signal for correcting frequency characteristics between two systems, A signal such as a 2T pulse signal (in the form of SIN square whose half-value width matches a cycle of a frequency corresponding to 帯 域 of the band) for correcting the phase characteristic between the systems is prepared.

The blanking signal generating means 21 is also provided with R
OM or the like, and a blanking signal 21a composed of the above-described switching signal and vertical synchronization signal.
(Interpolated during period T2 in FIG. 5).

As described above, the first and second selecting means 17 and 18 provide the first and second TCI signals 15a and 16a, TCI information signal 19a and correction signal 2 for the picture.
0a and the blanking signal 21a are appropriately selected, and the first and second recording signals 17a and 18a obtained by the D / A converter 2
2 and 23 are supplied to horizontal emphasis means 24 and 25, respectively.

The horizontal emphasis means 24 and 25 emphasize high frequency components in the horizontal direction. After the output signals of the horizontal emphasis means 24 and 25 are limited in amplitude by limiter means 26 and 27, the signals obtained by performing modulation with predetermined deviation by FM modulation means 28 and 29 are sent to a recording amplifier (not shown). And amplified to a predetermined level, and recorded on the magnetic tape TT via the magnetic heads A1 and A2 and the magnetic heads B1 and B2, respectively.

Here, the tape pattern of the magnetic tape TT will be described with reference to FIG. The numbers in the figure represent line numbers, "SW" is a switching signal, "V" is a vertical synchronizing signal, "CAL" is a correction signal, and "DA" is a TCI information signal. Each is represented.

The first recording signal 17a related to the even-numbered line is transmitted to the magnetic head A provided on the rotating drum.
1 using “SW” to “55” shown in FIG.
6 (1/2) ", and using the magnetic head A2," 556 "shown in FIG.
(1/2) ”to“ 1118 ”. On the other hand, the second recording signal 1 for the odd-numbered line
8A uses a magnetic head B1 disposed on a rotating drum, and switches from “SW” to “557 (1/1) shown in FIG.
2) "and the magnetic head B
2, “557 (1/1) shown in FIG.
2) ”to“ 1119 ”.
The magnetic heads A1 and B1 or the magnetic heads A2 and B2 disposed close to each other perform simultaneous recording, but the preceding audio magnetic heads 3A and 3B (not shown) perform recording in FIG. Audio tracks A and B are formed. still,
Magnetic heads A1, A2, B1, B2 and audio magnetic head 3
It is needless to say that the magnetic tape pattern shown in FIG. 8B can be obtained by appropriately setting the mounting height to A and 3B.

(Reproduction System) The reproduction system will be described with reference to FIG. In the figure, signals reproduced from the magnetic tape TT using the magnetic heads A1 and A2 and the magnetic heads B1 and B2 are amplified to a predetermined level by a preamplifier (not shown), and then FM demodulated means 30 and 31. FM demodulation is performed. Then, the output signal is supplied to the horizontal emphasis means 2.
After the high frequency components in the horizontal direction are attenuated by the horizontal de-emphasis means 32 and 33 having a complementary relationship to the first and fourth signals 25 and 25, the first and second signals obtained through the A / D converters 34 and 35 are obtained.
The second reproduction signals 34a and 35a are supplied to correction means 36 and 37.

The correction means 36 and 37 output the correction signal 2
The first and second reproduced signals 34a and 35a are corrected in accordance with an information signal 40a, which will be described later, representing the type of 0a.

The output signals of the correction means 36 and 37 are supplied to first and second TCI inverse conversion means 38 and 39. The output signal of the correction unit 37 is also supplied to the determination unit 40.

The discriminating means 40 determines whether the reproduced TCI
The discrimination between "0" and "1" of the information signal 20a is performed by holding the level of the period t2 or t3 in FIG. 7 described above and using this level as a threshold, and obtaining the level information of the level reference signal. At the same time, the time axis is extended to generate an information signal, which is supplied to the selection means 49. The selection means 49 inserts an information signal into the 603 line of the Y signal.

On the other hand, the first and second TCI inverse conversion means 3
8, 39 are the first and second TCI converting means 15,
16, the compressed luminance signal and the compressed line-sequential chrominance signal are time-axis-expanded to form a first reproduced Y, PR signal 3
8b, 38a and the second reproduced Y, PB signals 39b, 39a
And has generated.

Then, the first reproduced PR signal 38a and the second
The reproduced PB signal 39a and the vertical de-emphasis means 4
1 and 43 to reduce the high frequency components in the vertical direction, and then reduce the high frequency components in the time axis by the time axis de-emphasis means 44 and 47 to obtain signals 44 a and 4.
7a is supplied to the synthesizing means 48.

On the other hand, the first and second reproduced Y signals 38b, 3
9b, a vertical de-emphasis means 42 obtains a signal obtained by rearranging both input signals in line order, reducing high frequency components in the vertical direction, and dividing both signals into even lines and odd lines again. The signals 45a and 46a obtained by reducing the high frequency components in the time axis direction by the time axis deemphasis means 45 and 46 are supplied to the synthesizing means 48.

The above-mentioned time axis de-emphasis means 44 to 47 are controlled by the editing information relating to the information signal 40a, and the processing of the video signal after the editing point is performed in a plurality of frames before the editing point which is a past frame. This is performed while ignoring the video signal. Therefore, a high-quality video signal can be reproduced without inconveniences such as generation of an afterimage and blurring.
The vertical de-emphasis means 41 to 43 have a complementary relationship with the vertical emphasis means 12 to 14, respectively.
47 is complementary to the time axis emphasis means 8 to 11.

Then, the first and second reproduction Y
The signals 45a and 46a related to the signals 38b and 39b are rearranged in line order to generate a Y signal, and the first PR signal 38a
Is subjected to line-sequential demodulation on the signal 44a according to the above, to generate a PR signal, and the signal 47a related to the second PB signal 39a is subjected to line-sequential demodulation to generate a PB signal.

The PR and PB signals are supplied to D / A converters 50 and 51, respectively.
, And output PR and PB signals ee and ff to a transmission line (not shown). On the other hand, the Y signal is supplied to the selection means 49, where the output Y signal obtained by inserting the information signal 40a into the 603 line is output to a transmission line (not shown) via the D / A converter 52.

Further, according to the recording / reproducing apparatus of the present embodiment, even when recording an HD signal in which an information signal is inserted in 603 lines, 10 out of the scanning lines of the HD signal are used.
An information signal can be recorded on a magnetic tape in spite of recording only 32 lines. When reproducing this magnetic tape, an HD signal obtained by inserting the information signal into 603 lines can be output. Therefore, there is an effect that the management of the amplitude level and the like can be easily performed by the high-definition equipment at the subsequent stage.

In the above-described embodiment, the time-axis emphasis means and the time-axis de-emphasis means may be replaced by an example of a recording signal processing means and a reproduction signal processing means for performing image processing based on a video signal relating to a past frame or field. However, the present invention is intended to improve the inconvenience caused by the loss of continuity and correlation of the video signal at the edit point by returning the image processing immediately after the edit point to the initial state, so that the time axis It is needless to say that the present invention is not limited to the emphasis means and the time axis de-emphasis means. For example, the present invention may be applied to the compression / decompression processing of a video signal between frames or fields using orthogonal transformation or the like. is there.

In the above embodiment, the output signals of the correcting means 36 and 37 are used as the input signals of the determining means 40 in order to determine the information signal from the corrected signal. Of course, the output signal may be used as the input signal.

In the above-described embodiment, the video signal recording / reproducing apparatus is a VTR using a magnetic tape as a recording medium.
However, the present invention is not limited to this, and the recording medium may be a disk-shaped optical disk, a floppy disk, or the like, or may be a semiconductor memory. .

In the above embodiment, the video signal recording / reproducing apparatus has been described. However, the video signal recording apparatus according to the present invention may have at least a recording system. What is necessary is just to have a reproduction system at least.

[0054]

As described above, according to the configuration of the present invention, particularly, the modulation that changes via one of the intermediate values when changing from one state to the other state is separated from the video signal. Since at least the applied information signal is applied, even if the high frequency component of the video signal is emphasized, the information above the limiter level is not discarded, and there is an effect that a recording medium in which the information signal is completely recorded can be provided. Also, there is an effect that the information signal can be completely recorded by a simple method without having to separately perform emphasis in order to make emphasis characteristics different between the picture period of the video signal and the information signal.

According to the configuration of the present invention as described above, in particular, the information signal separated from the video signal is modulated at least by the modulation that inserts an intermediate value into the rising edge and the falling edge thereof. Since it has a TCI information signal generating means for generating a TCI information signal obtained by performing
Even if the high frequency components are emphasized by the emphasis means, the information at or above the limiter level is not truncated by the limiter means.Therefore, there is an effect that it is possible to provide a recording medium on which the information signal is completely recorded, and
There is no need to provide separate emphasis means for differentiating the emphasis characteristics between the picture period of the video signal and the information signal, and there is an effect that the emphasis means can be shared. Further, there is an effect that accurate information signals can be reproduced by reproducing the recording medium.

According to the configuration of the present invention described in claim 3, as described above, in addition to the effects of the invention described in claim 2, in particular, upper and lower lines including the predetermined line related to the video signal are deleted. And a TCI conversion unit that outputs a TCI signal obtained by time-axis compression of a luminance signal and a chrominance signal related to an output signal of the division unit and outputting a TCI signal obtained by time-axis multiplexing. There is an effect that a video signal can be recorded.

According to the configuration of the present invention described in claim 4, as described above, in addition to the effects of the invention described in claim 3, in particular, a correction signal generation for generating a correction signal for correcting transmission characteristics is provided. Because of the means, it is possible to record a signal capable of correcting the transmission characteristic of the information signal at the time of reproduction, and to obtain an information signal without error at the time of reproduction.

As described above, according to the configuration of the present invention described in claim 5, in addition to the effect of the invention described in claim 3, in particular, the high frequency component in the time axis direction related to the output signal of the dividing means. Time-axis emphasis means for emphasizing by comparing with the low-frequency component, and vertical emphasis means for emphasizing the vertical high-frequency component of the output signal of the time-axis emphasis means by comparing with the low-frequency component. Since the information signal having no correlation in the time axis direction and the vertical direction is not subjected to the time axis emphasis and the vertical emphasis, the information signal is not unnecessarily emphasized and the information is not lost by the limiter means. effective.

According to the structure of the present invention described in claim 6, as described above, the effect described in claim 4 is achieved in addition to the effect of the invention described in claim 5.

[Brief description of the drawings]

FIG. 1 is a waveform diagram of an information signal.

FIG. 2 is a waveform chart for explaining a line of an information signal inserted into an HD signal.

FIG. 3 is a block diagram for explaining a main part of the video signal recording device according to one embodiment of the present invention.

FIG. 4 is a conceptual diagram for explaining the operation of a dividing unit.

FIG. 5 is a waveform diagram of a TCI signal.

FIG. 6 is a timing chart for explaining a modulation operation.

FIG. 7 is a waveform diagram of a TCI information signal.

FIG. 8 is a tape pattern.

FIG. 9 is a block diagram for explaining a main part of a video signal reproducing apparatus according to one embodiment of the present invention.

[Explanation of symbols]

7 Division means 8-11 Time axis emphasis means 12-14 Vertical emphasis means 17,18 First and second TCI conversion means (TCI conversion means) 19 Recording information signal generation means 20 Correction signal generation means 24,25 Horizontal emphasis means (Emphasis means) 26, 27 Limiter means 28, 29 FM modulation means 15a, 16a First and second TCI signals (TCI signals) 17a, 18a First and second recording signals (recording signals) 19a TCI information signals 20a Correction signal 40a Information signal aa, bb, cc Y, PB, PR signal (video signal) TT Magnetic tape (recording medium)

Claims (6)

(57) [Claims] 1. A video signal recording method for recording a video signal in which an information signal expressed in a binary state is inserted into a predetermined line, wherein the information signal changes from one state to another state The information signal separated from the video signal is subjected to at least a modulation that changes through an intermediate value and inserted into the video signal, and the modulated information signal is inserted into the video signal. A video signal recording method comprising: performing emphasis for emphasizing a high-frequency component; limiting an amplitude to a predetermined level; performing FM modulation; and recording the video signal on a recording medium. 2. A video signal recording apparatus for recording a video signal in which an information signal expressed in a binary state is inserted into a predetermined line, wherein the information signal separated from the video signal is TC for generating a TCI information signal obtained by performing at least modulation for interpolating an intermediate value on a rising edge and a falling edge
I information signal generating means, emphasis means for emphasizing a high frequency component of a signal obtained by inserting the TCI information signal into the video signal which has been subjected to predetermined recording processing, and an amplitude of an output signal of the emphasis means is set to a predetermined value Video signal recording, comprising: limiter means for limiting the level to a level; FM modulation means for performing FM modulation on an output signal of the limiter means; and recording means for recording the output signal of the FM modulation means on a recording medium. apparatus. 3. A video signal recording apparatus for recording a video signal in which an information signal expressed in a binary state is inserted into a predetermined line, wherein the upper and lower lines including the predetermined line related to the video signal And a TC for outputting a TCI signal obtained by compressing the luminance axis and the chrominance signal relating to the output signal of the dividing unit on the time axis and multiplexing the time axis.
I conversion means; and a TC for generating a TCI information signal obtained by subjecting the information signal separated from the video signal to at least modulation for interpolating an intermediate value at a rising edge and a falling edge thereof.
I information signal generating means; emphasis means for emphasizing high frequency components of the signal having the TCI signal and the TCI information signal; limiter means for limiting the amplitude of an output signal of the emphasis means to a predetermined level; A video signal recording apparatus, comprising: an FM modulation unit that performs FM modulation on an output signal of the limiter unit; and a recording unit that records the output signal of the FM modulation unit on a recording medium. 4. A video signal recording apparatus for recording a video signal in which an information signal expressed in a binary state is inserted into a predetermined line, comprising: an upper and lower line including the predetermined line related to the video signal. And a TC for outputting a TCI signal obtained by compressing the luminance axis and the chrominance signal relating to the output signal of the dividing unit on the time axis and multiplexing the time axis.
I conversion means; and a TC for generating a TCI information signal obtained by subjecting the information signal separated from the video signal to at least modulation for interpolating an intermediate value at a rising edge and a falling edge thereof.
I information signal generating means, correction signal generating means for generating a correction signal for correcting transmission characteristics, emphasis means for emphasizing high frequency components of the TCI signal, the TCI information signal and a signal having the correction signal Limiter means for limiting the amplitude of the output signal of the emphasis means to a predetermined level; FM modulation means for performing FM modulation on the output signal of the limiter means; and recording the output signal of the FM modulation means on a recording medium. A video signal recording device, comprising: recording means. 5. A video signal recording apparatus for recording a video signal in which an information signal expressed in a binary state is inserted into a predetermined line, comprising: an upper and lower line including the predetermined line related to the video signal. Dividing means for dividing the signal into two systems, a time axis emphasis means for enhancing a high frequency component in a time axis direction in relation to an output signal of the dividing means with a low frequency component, and emphasizing the time axis. Vertical emphasis means for enhancing a vertical high frequency component related to an output signal of the means by comparing with a low frequency component, and compressing a luminance axis and a chrominance signal related to an output signal of the vertical emphasis means on a time axis. TCI conversion means for outputting a TCI signal obtained by axis multiplexing; and a modulation for inserting an intermediate value into a rising edge and a falling edge of the information signal separated from the video signal. TC for generating TCI information signal also obtained by applying the
I information signal generating means, horizontal emphasis means for enhancing a high frequency component in the horizontal direction of the TCI signal and a signal having the TCI information signal by comparing them with low frequency components, and the horizontal emphasis means Limiter means for limiting the amplitude of the output signal to a predetermined level, FM modulation means for performing FM modulation on the output signal of the limiter means, and recording means for recording the output signal of the FM modulation means on a recording medium. A video signal recording device, characterized in that: 6. A video signal recording device for recording a video signal in which an information signal expressed in a binary state is inserted into a predetermined line, comprising: an upper and lower line including the predetermined line related to the video signal. Dividing means for dividing the signal into two systems, a time axis emphasis means for enhancing a high frequency component in a time axis direction in relation to an output signal of the dividing means with a low frequency component, and emphasizing the time axis. Vertical emphasis means for enhancing a vertical high frequency component related to an output signal of the means by comparing with a low frequency component, and compressing a luminance axis and a chrominance signal related to an output signal of the vertical emphasis means on a time axis. TCI conversion means for outputting a TCI signal obtained by axis multiplexing; and a modulation for inserting an intermediate value into a rising edge and a falling edge of the information signal separated from the video signal. TC for generating TCI information signal also obtained by applying the
I information signal generation means; correction signal generation means for generating a correction signal for correcting transmission characteristics; and a high frequency component in the horizontal direction related to the TCI signal, the TCI information signal, and a signal having the correction signal. Horizontal emphasis means for enhancing compared to low frequency components, limiter means for limiting the amplitude of the output signal of the horizontal emphasis means to a predetermined level, and FM modulation for applying FM modulation to the output signal of the limiter means Means for recording the output signal of the FM modulation means on a recording medium.