JPH0728433B2 - Color video signal magnetic recording device and color video signal magnetic recording / reproducing device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color video signal magnetic recording device and a color video signal magnetic recording / reproducing device.

2. Description of the Related Art Generally, when treating a composite color video signal with a VTR, it is necessary to carefully consider the three points of influence of time axis fluctuation, frequency band, and waveform distortion (spurious). Where for broadcasting
The "direct color process method" used in VTRs does not compromise on these examination items, but on the other hand, it directly frequency-modulates the color video signal at a high tape head relative speed of 25 to 40 m / s, for example. Since recording and reproducing are performed by (FM), there is a drawback that a highly accurate mechanism, a large scale circuit and a large amount of tape are required.

On the other hand, in the "color under system" used in consumer or industrial VTRs, for example, the relative speed of the tape head is relatively low, such as several m / s, and the carrier color signal is the FM band of the luminance signal. Convert to lower frequency around 700kHz and FM
Since the luminance signal is superimposed and recorded and reproduced, the drawbacks such as the above-mentioned broadcast VTR are improved.

Problems to be Solved by the Invention By the way, when the color video signal processing method such as the “direct color process method” and the “color under method” in the VTR is regarded as a kind of color video signal transmission method, In the conventional color video signal transmission system such as ", there is a drawback that only about 1/2 of the information amount of the composite color video signal is actually transmitted. Due to this lack of information amount, there has been a problem that, for example, in a reproduced image of a home VTR, lack of resolution, sharpness and color resolution and lack of detail occur.

In order to solve the above-mentioned problems, the applicant of the present invention first founded in 1985.
In the patent application dated December 28, we proposed a "color video signal transmission method" that converts the composite color video signal into the pseudo component signal and transmits it, and restores the pseudo component signal to the original composite color video signal. . In this color video signal transmission system, a first color data is output by sampling a composite color video signal at a sampling frequency n · f _SC (where n is a natural number and f _SC is a color subcarrier frequency). The A / D conversion means and the first data for each sampling period 1 / 1f _SC which makes the first data in phase with the color subcarrier of the composite color video signal within one horizontal scanning period (1H). The first data conversion for converting the first data of the n group into 1 group as a group, and outputting the second data obtained by arranging the first data of the n group in series for each group. Means, first D / A conversion means for converting the second data into an analog video signal and outputting it to the transmission line, and output analog video signal for the first D / A conversion means coming through the transmission line Analog-to-digital converted to restore the second data and output the second data. Data of each sampling point is sequentially extracted from the n-group data in the second data from the A / D conversion means and the second A / D conversion means, and the data of each sampling point is extracted again. Second data converting means for restoring and outputting the data, and first to digital-analog converting the first data from the second data converting means to restore and output the original dual color video signal. 2 D / A conversion means.

However, in the color video signal transmission method described above, since the composite color video signal is sampled at the sampling frequency n · f _SC , the required transmission band of the transmission line (VTR, etc.) is n / 2 times the color subcarrier frequency f _SC. There was a problem that it would spread.

Therefore, according to the present invention, two kinds of data groups based on the sampling data of the composite color video signal are alternately converted into the pseudo component signals for every one field or every 2H and are transmitted, and the current line and one field or the line before the 2H. After interpolating between the sampling data of both the pseudo component signals, the original composite color video signal is restored by A / D conversion to solve the above-mentioned problems. It is an object to provide a magnetic recording / reproducing device.

Means for Solving the Problems FIGS. 1 (A) and 1 (B) are block system diagrams showing the configuration of the device of the present invention. Here, the device of the present invention shown in FIG. 1 (A) comprises an A / D conversion means 1, a thinning means 2 and a D / A conversion means 3. The A / D conversion means 1 converts the composite color video signal into a sampling frequency n · f _SC (where n is 2
The above integer, f _SC is the color subcarrier frequency) and outputs the sampling data obtained by sampling. Thinning means 2
Is a group of sampling data for each cycle 1 / f _{SC in} which the output sampling data of the A / D conversion means 1 is in phase with the color subcarrier of the composite color video signal in each horizontal scanning period. Serially converted into a total of n data groups, and in each data group, a total of n data groups consisting of only odd-numbered sampling data and a total of n data groups consisting of only even-numbered sampling data, respectively. The groups and are alternately output for each field or every 2H. The D / A conversion means 3 converts the output data of the thinning means 2 into an analog video signal and outputs it to the transmission path.

The apparatus of the present invention shown in FIG. 1 (B) is a first A / D conversion means 1'having the same functions as the A / D conversion means 1, the thinning means 2 and the D / A conversion means 3, respectively. The second A / D converting means 4, the interpolating means 5, and the second D / A converting means 6 are added to the thinning means 2'and the first D / A converting means 3 '. Here, the second A / D conversion means 4 performs analog-digital conversion on the analog video signal coming through the transmission path and outputs it. The interpolating means 5 sequentially extracts and reads out the data of each sampling point one by one from the output data of the second A / D conversion means 4 of the current line and the line one field before, or the current line. From the output data of the second A / D conversion means 4 on the line before and 2H, the data at each sampling point is sequentially extracted and read one by one for each group. Second
The D / A conversion means 6 performs digital-analog conversion of the output data of the interpolation means 5 to restore the original composite color video signal and output it.

Operation The composite color video signal is converted into sampling data via the A / D conversion means 1 and then supplied to the thinning means 2 where the period in which the color subcarrier has the same phase in each horizontal scanning period. Sampling data for each 1 / f _SC are serially converted into a total of n data groups so that one group is composed of one sampling data group. Then, in each data group, a total of n data groups consisting of only odd-numbered sampling data and a total of n data groups consisting of only even-numbered sampling data are alternated every one field or every 2H. To the D / A conversion means 3.

Thereafter, the D / A conversion means 3 converts the incoming output data of the thinning means 2 into an analog video signal and transmits it to the transmission path. Since the analog video signal is thinned out in half as compared with the composite color video signal, the required transmission band of the transmission line is about n / 4 times the color sub-carrier frequency f _SC .

Next, the analog video signal that has passed through the transmission line is the second A / D
Analog-to-digital conversion is performed via the conversion means 4,
It is supplied to the interpolation means 5. The interpolating means 5 performs interpolation by the output data of the second A / D converting means 4 for the current line and the line one field before, or the current line and the line 2H before, and is the reverse of the thinning means 2. After the data conversion is performed, the output data is converted into the second D / A conversion means 6
, Where the original composite color video signal is restored.

Next, an embodiment of the device of the present invention will be described with reference to FIGS.

Embodiment FIGS. 2 (A) to (D) and FIGS. 3 (A) to (E) are explanatory views of the principle of an embodiment of the device of the present invention. Here, the case where the device of the present invention is applied to a recording and reproducing system of a VTR will be described as an example. FIGS. 4 and 5 show an example of a recording system and a reproducing system of a VTR to which the device of the present invention can be applied. A block system diagram is shown.

In FIG. 4, the composite color video signal as shown in FIG.
It is supplied to the A / D converter 9 and the timing pulse generating circuit 10 via the C circuit 8 respectively. By the way, as is well known, the composite color video signal has a color subcarrier frequency f _SC (for example, f _SC = 3.58 MHz in the NTSC system, f _SC in the PAL system, and
_This is a signal obtained by multiplexing the carrier color signal obtained by quadrature modulation of the color sub-carrier liquid ( _SC = 4.43MHz) with two kinds of color difference signals and band sharing with the luminance signal.

The timing pulse generation circuit 10 separates a horizontal synchronizing signal from an incoming composite color video signal and generates a timing pulse P of one horizontal scanning period (1H) period obtained by waveform shaping the horizontal synchronizing signal, The phase locked loop (PLL) 11 and the controller 12 are supplied respectively. The PLL 11 uses, for example, a frequency 4f based on the incoming timing pulse P.
Pulse signal of _SC (4f _SC ≈ 14.32MHz for NTSC method)
P ₁ and four-phase pulse signals P ₂ having a frequency f _SC , which are out of phase with each other by 90 °, are generated and supplied to the controller 12, respectively.

Based on the pulse signal P ₁ , the control device 12 generates the sampling pulse P _{S having the} frequency 4f _SC , the write control signal P _W , the read control signal P _R, and the pulse signal P ₃ , respectively, and the A / D converter 9,
Random access memory (RAM) 13 and D / A converter 14
And the pulse signals P ₁ and P _{2 respectively} ,
The address signal P _A is generated and supplied to the RAM 13.

The A / D converter 9 samples the incoming composite color video signal with the sampling pulse P _S having a sampling frequency of 4f _SC , and outputs, for example, digital data having a quantization bit number of 7 bits or 8 bits per sampling point. To generate. Here, FIG. 2 (B) shows a relationship diagram between the color subcarrier and each sampling point, and each o mark on the color subcarrier indicates each sampling point. In FIG. 2B, since the sampling frequency is four times the color subcarrier frequency f _SC , four kinds of sampling points having different phases appear in one cycle of the color subcarrier. The sampling data at these four types of sampling points are A ₁ , B ₁ , C ₁ , D respectively.
₁ (or A ₂ , B ₂ , C ₂ , D ₂ etc.), the A / D converter 9
Sequentially generates each of the above sampling data having a quantization bit number of 7 bits or 8 bits in the order of A ₁ , B ₁ , C ₁ , D ₁ , A ₂ , B ₂ , C ₂ , D ₂ ... Output to.

The RAM 13 has a storage capacity of a minimum of 2H, sequentially writes the sampling data at a predetermined address in accordance with the address signal P _A and the write control signal P _W , and then separates 1H, and each Sampling data (referred to as in-phase data) of each cycle 1 / f _{SC in which} the phases of the sampling data with respect to the color subcarrier of the composite color video signal are in phase with each other. ₁ A ₂ …), group B data (B ₁ B ₂ …), group C data (C ₁ C ₂
...) and D group data (D ₁ D ₂ ...) are generated respectively.

Next, in the RAM 13, as shown in FIGS. 2C and 2D, for example, the m-th (where m is a natural number) field is A
Digital data consisting of only data of the A group and C group per 1H obtained by thinning out the data of the B group and the D group from the data of the group to the D group are read according to the read control signal P _R ,
On the other hand, in the (m + 1) th field, the digital data consisting of only the data of the B and D groups per 1H obtained by thinning the data of the A and C groups from the data of the A to D groups is used as the read control signal P _R. Read accordingly.

In this way, the RAM 13 reads out to the D / A converter 14 digital data in which the digital data for each field are different from each other in response to the read control signal P _R which changes for each field, for example.

Further, as the timing of thinning out the data in the RAM 13, the data may be thinned out at the time of writing instead of at the time of reading as described above. In this case, RAM13 is
Digital data from A / D converter 9 (A ₁ B ₁ C ₁ D ₁ A ₂ B ₂ C ₂ D ₂
...), for example, in the m-th field, digital data (A ₁ C ₁ A ₂ C ₂ ...) obtained by thinning out digital data (B ₁ D ₁ B ₂ D ₂ ...) is used as an address signal P _A and write control. signal
Write according to P _W , while the (m + 1) th field is an address signal of digital data (B ₁ D ₁ B ₂ D ₂ …) obtained by thinning digital data (A ₁ C ₁ A ₂ C ₂ …) Write according to P _A and the write control signal P _W. After that, RAM13
Is a group of the same phase data, the mth field is digital data consisting of data of A group and C group, while the (m + 1) th field is digital data consisting of data of B group and D group. Generate data,
The data is read out and read out alternately every one field according to the control signal P _R.

Next, the D / A converter 14 performs digital-analog conversion (D / A conversion) on the incoming digital data according to the pulse signal P _3.
Then, the m-th field generates an analog video signal in which two color video signals A and C are arranged in 1H, as shown in FIG. m +
The 1) th field is 1H as shown in FIG. 2 (D).
An analog video signal in which two color video signals B and D are arranged is generated and alternately output to the FM modulator 16 via the emphasis circuit 15 for each field.

In this way, the composite color video signal is converted into a signal in a special component state having no color subcarrier (the pseudo component signal), so that it is resistant to, for example, jitter and spurious interference does not occur. It becomes to have the property as if it were a component signal, such as facilitating FM transmission.

Next, the FM modulator 16 outputs the frequency-modulated (FM) analog video signal obtained by frequency-modulating (FM) the incoming analog video signal to the recording amplifier 17. The recording amplifier 17 uses a pulse code modulated (PCM) audio signal (P
The CM audio signal) and the FM analog video signal are supplied to rotary heads H ₁ and H ₂ mounted 180 ° opposite to a rotary head drum (not shown). This allows the above PCM
The audio signal and the FM analog video signal are recorded on a magnetic tape (not shown).

Here, taking the NTSC system as an example, the band required to transmit the analog video signal is 3.58 MHz (= (4f _SC / 2)
× (1/2) = f _SC), and the results in the data may be a half of the required transmission bandwidth when no thinning the _{(4f SC / 2 = 2f SC} = 7.16MHz).

Next, the operation of the reproducing system of the VTR to which the device of the present invention is applied will be described with reference to FIGS. 3 (A) to (E) and FIG.
Here, the FM reproduction signal reproduced from the time tape by the rotary heads H ₁ and H ₂ is supplied to the switch circuit 21 via the preamplifiers 19 and 20, respectively. The switch circuit 21 includes a preamplifier 19 and a preamplifier 19 in response to a switching signal from an input terminal 22 corresponding to a magnetic tape sliding scanning period of each of the rotary heads H ₁ and H _2.
Each of the 20 output signals is switched and output alternately. As a result, a continuous FM reproduction signal is obtained. The output FM reproduction signal of the switch circuit 21 is sent to the FM via the equalizer circuit 23.
While being supplied to the demodulator 24 and the dropout detector 25, the PCM audio signal in the output FM reproduction signal is output to an audio signal processing unit (not shown) via the output terminal 26.

The FM demodulator 24 outputs the reproduced signal obtained by FM demodulating the incoming output FM reproduced signal to the A / D converter 27 and the timing pulse generation circuit 28, respectively. The timing pulse generation circuit 28 is
The horizontal synchronizing signal is separated from the incoming reproduction signal, and the timing pulse P'obtained by shaping the waveform of this horizontal synchronizing signal is generated and supplied to the PLL 29 and the control device 30, respectively. PLL29
Is based on the incoming timing pulse P '.
A pulse signal P ₁ ′ of 4f _SC and a pulse signal P ₂ ′ of four phases of frequency f _SC are generated and supplied to the control device 30. on the other hand,
A clock circuit 32 having a crystal oscillator 31 generates a reference clock signal P ₄ having a frequency of 4f _SC and outputs it to the control device 30.

The control device 30 generates the sampling pulse P _S ′ and the write control signal P _W ′ based on the pulse signal P ₁ ′, and the A / D
The pulse signal P is supplied to the converter 27 and the RAM 33, respectively.
_The address signal P _A ′ is generated based on ₁ ′ and P ₂ ′
Supply to 33. Further, the control device 30 controls the reference clock signal.
Based on P ₄ , read control signal P _R ′ and pulse signal P ₃ ′
Is generated and supplied to the RAM 33 and the D / A converter 34, respectively.

By the way, since the output reproduction signal of the FM demodulator 24 contains a time axis error (jitter), the output pulse signals P ₁ ′ and P ₂ ′ of the PLL 29 also contain jitter.
Therefore, the sampling pulse output from the controller 30
The same jitter as that of the reproduction signal is included in P _S ′, the write control signal P _W ′ and the address signal P _A ′. Therefore, since the A / D converter 27 and the RAM 33, which will be described later, perform signal processing for signals that include jitter, there is no effect of jitter associated with this signal processing. After that, D / A
Reference clock signal that does not include jitter in converter 34
Since the digital data is read from the RAM 33 and D / A converted by the read control signal P _R ′ and the pulse signal P ₃ ′ generated based on P ₄ , an analog reproduced signal containing no jitter is obtained. In this way, compensation for jitter is performed.

Next, taking the signal of the m-th field as an example, A /
The operation of the D converter 27, the RAM 33 and the D / A converter 34 will be described. Here, the A / D converter 27 samples an incoming reproduction signal as shown in FIG. 3 (A) based on the sampling pulse P _S ′ and, for example, the number of quantization bits per sampling point is 7 bits or It is converted into 8-bit digital data as shown in FIG. 3 (B) and output to the RAM 33. This digital data contains data of A group and C group per 1H.

The RAM 33 has a storage capacity for one field, and writes incoming digital data at a predetermined address according to the address signal P _A ′ and the write control signal P _W ′. Then RAM33
Is the current digital data as shown in FIG. 3 (B),
As shown in (C) of the figure, the digital data of one field (262H) before which consists of the data of B group and D group per 1H is used to respond to the read control signal P _R ′, A group, B group, C group. Then, one data is taken out from each group data in order of D group and D group, and as shown in FIG. 3 (D), each data is (A ₁ B ₁ C ₁ D ₁ A ₂ B ₂ C ₂ D ₂ ...) is read in order to the D / A converter 34. The D / A converter 34 D / A converts the incoming digital data according to the pulse signal P ₃ ′, and finally restores the original composite color video signal as shown in FIG. 3 (E). ,
Output to output terminal 35.

In this case, in general, the position of the current line and the line one field before are almost the same on the screen, and the reproduced images are almost the same between the two lines. It can be said that the levels of the composite color video signals in are also approximately the same level. Therefore, as described above, if the field interpolation is performed using the digital data of the current line and the line one field before, the composite color video signal of the current line can be restored almost completely.

On the other hand, when the dropout detector 25 detects that a dropout has occurred in the incoming reproduction signal, it generates a detection signal and outputs it to the control device 30. In this case, the control device 30 causes the digital data 2H before, which has the same subcarrier phase as the current horizontal scanning period, to be read from the RAM 33 and output to the D / A converter 34. The D / A converter 34 D / A converts the incoming digital data 2H before and outputs it to the output terminal 35 as a composite color video signal of the current horizontal scanning period.

Thus, according to this embodiment, the required transmission band of the VTR may be about 3.58 MHz, and the band of the composite color video signal obtained from the output terminal 35 is 7.16 MHz (resolution is 570
Book).

The signal processing of the device of the present invention may be performed by a digital circuit as shown in FIG. 4 and FIG. 5, and for example, a charge coupled delay element (CCD delay element) may be used.

In the embodiment of the apparatus of the present invention shown in FIGS. 2 and 3, the data is thinned out so that the digital data is made different for each field at the time of recording the VTR, and the field interpolation is performed at the time of reproducing. However, the digital data is changed every 2H, and then 2H
You may make it interpolate between every digital data. In this case, since the phase of the subcarrier is the same between the current line and the line 2H before, and the signal level is also substantially the same, the composite color video signal of the current line is almost perfect as described above. Restored to.

Note that the sampling frequency is not limited to 4f _SC and may be any integer multiple of 2 or more of the color subcarrier frequency f _SC , and the sampling data in the RAM 13 may be thinned out. The method is not limited to that shown in FIG.

Here, taking 3f _SC as an example of the sampling frequency, RA
Another sampling data thinning method in M13 will be briefly described. In this case, first, the A / D converter 9 converts the incoming composite color video signal into a sampling frequency of 3f _SC.
Sampling data obtained by sampling with
The data are sequentially output to the RAM 13 in the order of a ₁ , b ₁ , c ₁ , ... A ₄ , b ₄ , c ₄ , ... (However, a _{1 to} c ₄ etc. indicate each sampling data).
Next, the RAM 13 stores data of group a (a ₁ a ₂ a ₃ a ₄ ...) and data of group b (b ₁ b ₂ b ₃ b ₄ ...) in which the same phase data of the incoming sampling data is taken as one group. ) And group C data (c ₁ c ₂ c ₃ c
₄ ...) respectively, for example, the m-th field carries all of the data of group a and half of the data of group c,
The next (m + 1) th field carries all of the data of group b and the other half of the data of group c.

In addition, as another sampling data thinning method, RAM1
At 3, for example, in the m-th field, sampling data a ₁ , c ₁ , b ₂ , a ₃ , c ₃ , b _{4 is obtained} by thinning out even-numbered data from the sampling data output from the A / D converter 9. ... etc. are taken in to generate data a'group (a ₁ a ₃ ...), data b'group (b ₂ b ₄ ...) and data c'group (c ₁ c ₃ ...) respectively. , D / A converter 14, while the next (m + 1) th field thins out odd-numbered data of the sampling data output from the A / D converter 9 to obtain data (a ₂ a ₄ ...), b ″ group data (b ₁ b ₃ …) and c ″ group data (c ₂ c ₄ …) may be generated and output to the D / A converter 14. .

Since the PAL system also has the regularity of the in-phase sampling points for the color sub-carriers as in the NTSC system, it is needless to say that the device of the present invention can be applied to the PAL system composite color video signal. .

EFFECTS OF THE INVENTION As described above, according to the present invention, two kinds of data groups based on the sampling data of the composite color video signal are alternately converted into the pseudo component signal for each field or every 2H, and are transmitted. After interpolating between the sampling data of both line and one field or the line of 2H before the pseudo component signal, A / D conversion was performed to restore the original composite color video signal. With the features of.

It is possible to reduce the increase in the required transmission band due to the conversion from the composite color video signal to the pseudo component signal, and to perform the interpolation between the sampling data of the current line and the sampling data of the one field or 2H previous line. Therefore, the information amount of the composite color video signal can be restored without any shortage.

When the transmission line uses FM modulation, in the transmission method of the composite color video signal using sub-Nyquist sampling, the signal output to the transmission line has a high frequency component with large energy related to the color subcarrier, According to the configuration of the present invention,
Since the signal form output to the transmission line is a pseudo-component signal in which a composite color video signal is equivalently demodulated, high-frequency components with large energy related to the color width carrier are dispersed in the entire band, Since it can be suitable for FM modulation in which high-frequency S / N deteriorates, FM recording and reproduction of a composite color video signal becomes easy.

If the transmission line has jitter, the signal form output to the transmission line in the transmission method that directly sub-Nyquist samples the composite color video signal is the same as the composite color video signal. Due to the characteristic, the phase information of the color subcarrier is lost, and the color signal is disturbed when combined on the receiving side. However, according to the configuration of the present invention, the signal form output to the transmission path is a composite color image. Since the signals are equivalently demodulated pseudo-component signals, they are unlikely to be affected by the jitter characteristics of the transmission path.

As described above, in the form of analog video signal that is simpler than digital transmission, the magnetic tape, which is easily affected by jitter, is used as the transmission path, and while maintaining the characteristics of the component signal, the required transmission band of the composite color video signal can be reduced .

[Brief description of drawings]

1 (A) and (B) are block system diagrams showing the configuration of the device of the present invention, and FIGS. 2 (A) to (D) and FIGS. 3 (A) to (E) are of the device of the present invention, respectively. FIG. 4 is a block diagram showing an example of a recording system and a reproducing system of a VTR to which the device of the present invention can be applied. 7 ... Composite color video signal input terminal, 8 ... Automatic gain control circuit (AGC circuit), 9,27 ... A / D converter, 10,28 ... Timing pulse generation circuit, 11,29 ... Phase Locked loop (PLL), 12,30 …… Control device, 13,33 …… Random access memory (RAM), 14,34 …… D / A converter, 15 …… Emphasis circuit, 16 …… FM Modulator, 17 ……
Recording amplifier, 18 …… PCM audio signal input terminal, 19,20 …… Preamplifier, 21 …… Switch circuit, 22 …… Switching signal input terminal, 23 …… Equalizer circuit, 24 …… FM demodulator, 25 …… Drop Out detector, 26 …… PCM audio signal output terminal, 31
…… Crystal oscillator, 32 …… Clock circuit, 35 …… Composite color video signal output terminals, H ₁ , H ₂ …… Rotary head.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location H04N 11/24

Claims (4)

[Claims] 1. An A / D conversion means for outputting sampling data obtained by sampling a composite color video signal at a sampling frequency n · f _SC (where n is an integer of 2 or more, and f _SC is a color subcarrier frequency). And a total of n pieces of sampling data for each period 1 / f _{SC, in which} each sampling data has the same phase with the color subcarrier of the composite color video signal within each horizontal scanning period. To generate a pseudo-component signal that is serially converted into a data group of, and in each data group, a total of n data groups each consisting of only odd-numbered sampling data and a total of n data groups each consisting of only even-numbered sampling data And a D / A conversion unit for converting the output data of the thinning unit into an analog video signal, and the analog unit. A color video signal magnetic recording device, comprising: a recording means for performing at least FM modulation on a video signal and recording the magnetic tape. 2. A / D conversion means for outputting sampling data obtained by sampling a composite color video signal at a sampling frequency n · f _SC (where n is an integer of 2 or more, f _SC is a color subcarrier frequency). And a total of n pieces of sampling data for each period 1 / f _{SC, in which} each sampling data has the same phase with the color subcarrier of the composite color video signal within each horizontal scanning period. To generate a pseudo-component signal that is serially converted into a data group of, and in each data group, a total of n data groups each consisting of only odd-numbered sampling data and a total of n data groups each consisting of only even-numbered sampling data And a first D / A conversion means for converting the output data of the thinning-out means into an analog video signal, Recording means for subjecting the analog video signal to at least FM modulation and recording it on a magnetic tape; reproducing means for reproducing the magnetic tape and at least performing FM demodulation to reproduce the analog video signal; and analog-digital analog-digital signal Second A / D conversion means for converting and outputting, and the second A / D of the current line and the line one field before
Interpolation means for sequentially extracting and reading out data at each sampling point one by one from the output data of the conversion means, and digital-analog conversion of the output data of the interpolation means to restore the original composite color video signal. And a second D / A conversion means for outputting as a color image signal magnetic recording / reproducing apparatus. 3. A / D conversion means for outputting sampling data obtained by sampling a composite color video signal at a sampling frequency n · f _SC (where n is an integer of 2 or more, and f _SC is a color subcarrier frequency). And a total of n pieces of sampling data for each period 1 / f _{SC, in which} each sampling data has the same phase with the color subcarrier of the composite color video signal within each horizontal scanning period. To generate a pseudo-component signal that is serially converted into a data group of, and in each data group, a total of n data groups each consisting of only odd-numbered sampling data and a total of n data groups each consisting of only even-numbered sampling data And a D / A conversion unit for converting the output data of the thinning unit into an analog video signal, and the analog unit. A color video signal magnetic recording device, comprising: a recording means for performing at least FM modulation on the video signal and recording the magnetic tape on a magnetic tape. 4. A / D conversion means for outputting sampling data obtained by sampling a composite color video signal at a sampling frequency nf _SC (where n is an integer of 2 or more and f _SC is a color subcarrier frequency). And a total of n pieces of sampling data for each period 1 / f _{SC, in which} each sampling data has the same phase with the color subcarrier of the composite color video signal within each horizontal scanning period. To generate a pseudo-component signal that is serially converted into a data group of, and in each data group, a total of n data groups each consisting of only odd-numbered sampling data and a total of n data groups each consisting of only even-numbered sampling data And a first D / A conversion means for converting the output data of the thinning-out means into an analog video signal, Recording means for subjecting an analog video signal to at least FM modulation and recording it on a magnetic tape; playback means for playing back the magnetic tape and subjecting at least FM demodulation to playing back the analog video signal; Second A / D conversion means for converting and outputting, and the second A / D of the current line and the line two horizontal scanning periods before
Interpolation means for sequentially extracting and reading out data at each sampling point one by one from the output data of the D conversion means, and digital-analog conversion of the output data of the interpolation means to restore the original composite color video signal. And a second D / A conversion means for outputting the same as the color video signal magnetic recording / reproducing apparatus.