JPS5928787A - Recording and reproducing system of color video signal - Google Patents

Abstract

PURPOSE:To realize a high density recording of an entire color video signal as well as a color signal, by multiplexing two kinds of chrominance signals with the phase modulation of an orthogonal two-phase. CONSTITUTION:Three kinds of carriers are formed with a phase shifter 2 from an output of an oscillator 1. A balancing modulation wave is formed by inputting a chrominance signal ER-V(t) and -Asinomegact to a balanced modulator and a carrier chrominance signal CR(t) is formed by adding Acosomegact to the wave, the signal is inputted to an inverting circuit 4 to form a carrier chrominance signal + or -CR(t) by controlling the inversion of phase with a rectangular wave of 1/2fH. On the other hand, a chrominance signal EB-Y(t) and the Acosomegact are inputted to the balanced modulator, an Asinomegact is added to the balanced modulation wave to form the other carrier chrominance signal CB(t). Then, the signals CR(t) and CB(t) are multiplexed at a synthesis circuit 6 and a phase-modulated carrier luminance signal CY(t) and a reference signal FP are synthesized and recorded so that the phases of each subcarrier and a main carrier are arranged equally between adjacent tracks.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for recording and reproducing color single-floor signals, and in particular improves recording and reproducing color signals.

When recording video signals on magnetic media, two methods are available to improve HD recording density: the 1-phase modulation recording method (PM method) and the FM method using gradient anomalous recording.
method) is known.

(1k phase'ie A 書kA methodteId, special public [1
As disclosed in Publication No. 35651406 and Publication No. 53-41126 of the 1980s, (1) the main gear which is modulated by the bright 1 crazy signal (13)
Synchronize with the relative movement between the body and the video head, (2)
This ±carry'f is modulated by J=a no 1ηp or 1. :
3 Rano'a/l;, under I, the luminance is 1 ohm, and the Aigyo spin is ~, (,3) This modulated luminance I, r, that is, the grinding M1 anti-1'5, is t. 1 and 0 horizontal direction υj
The position of Hakugo: is between the 14th track and Jl: '+ Izuki.'
As for the phase of the E-carrier, please be sure to follow the same rules as soon as possible.

When performing phase modulation recording in this way.

(a) Since nψ≦1.3, the amplitude of the carrier component recorded on the valley track is approximately constant.

Furthermore, since the carrier component is in the same phase between tracks, the gear component of the reproduced signal remains constant even if the video head straddles adjacent trunks P.

(b) Since mp≦1.3, sideband components of secondary and higher orders can be ignored, and since the synchronization signal is 361 between tracks, even if video player 1 crosses over adjacent tracks, the sideband of playback number 11 can be ignored. Although the wave component is a composite of multiple frames, it is only a composite of screens with extremely strong correlation. Therefore, when recording, record at a high degree so that the data is partially overwritten or partially overwritten.

On the other hand, even if there is a tracking error during reproduction, the luminance signal can be demodulated without any problem of crosstalk.

On the other hand, in the FM system using Ill't anomalous, as is well known, an anomalous effect is utilized, and frequency-modulated luminance signals, that is, carrier luminance signals are recorded with different anomalous values on adjacent tracks. That's no good.

Even if the video head straddles one adjacent track during playback, no signals will be received from the anomalously different tracks except for low frequency components. Therefore, as with the phase modulation recording method, even if a tracking error occurs during high-density recording and reproduction, there is no problem of cross-steering.

Note that both the phase modulation recording method and the tilt anomous FM method use angle modulation, so even if AM noise is added due to fluctuations in head touch during recording and playback,
By applying a limiter, this AMM noise can be removed from the luminance signal.

As mentioned above, a preferable recording method has been used for the luminance signal in the color video signal.
) Because there are two unique color signals, amplitude modulation (APvi) is applied to prevent the spread of Shuichi Teijo IA'6.
I recorded 6 self-recordings, and used thinning recording to alternately record two color signals every horizontal line.

Therefore, in the amplitude modulation recording method of the color signal, the image quality is affected by the AjN1 noise directly.

- There is still a problem in that the thinning-out 6-edge method described above suffers from a loss of image quality because part of the color information is missing.

In view of the above-mentioned conventional color signal recording technology, the present invention has developed a color video No. 1G system that can record and reproduce two types of color signals without deteriorating image quality despite having a narrow occupied band, and which can be easily modulated and demodulated. It provides a recording and reproducing method.

That is, in the present invention, the two color difference signals (R-Y) and (13-Y) or the two primary color signals and two unique color signals are multiplied by quadrature two-phase phase modulation. In order to record the color signal of color 1mf71m, the first and second subcarriers are synchronized with the relative movement between the video head and the magnetic medium, are orthogonal to each other, and have frequencies whose respective phases are aligned between adjacent tracks. is phase-modulated with one of the two color signals, and these two phase-modulated colors (g, that is, the two carrier color signals are combined with the first and second sub-color signals to be phase-modulated with the two carrier color signals). At least one of the carriers is phase-shifted every horizontal scan to provide two carrier color signals whose phase is shifted relatively by 180 degrees every horizontal scan, The two phase-shifted carrier color E numbers are multiplexed, and the multiplexed carry-in color signals are distributed at least 4 nil between the recording position of the water and soil synchronization signal or between adjacent trunks, and between the first and second tracks that are momentarily connected. Second
In order to arrange all 67 phases of each of the sub-gears of
The A-tomoe signal takes one horizontal scanning time of 90L, and the power of the signal before and after the delay is 1j and the branching process is performed to convert it into two input color signals of 1t.
By demodulating each carrier color signal, which has been divided by t'1ll-, with a phase reference signal whose phase is the same as the phase shift at the time of each recording, an ordinary two-color color signal is obtained.

The color signal recording method described above has the advantage that occupied hydrofluoric acid does not spread, is not affected by AΔ·1 noise, and is free from crosstalk problems.

Furthermore, the quadrature two-phase phase shift W4 of the color signal mentioned above and its demodulation can be realized with a simple circuit configuration by using a balanced modulator, and the reproduced color signal will still be good.

One of the purposes of the present invention is to realize areal density recording not only for color (G) but also for the entire color video signal, and at the same time to obtain good quality pictures. In addition to adopting the phase modulation recording method as described above, we will also adopt the phase & tone recording method, which is not affected by AM noise and has no problem with crosstalk for the luminance signal.

First, the principle of phase modulation using a balanced modulator will be explained.

Now, change the carrier to Aazωct, change E (g to f (
tl, and excluding the constant term, the phase modulated signal c[t
eft)=Am[ωct+kf(tl) The equation (1) is obtained. Here, all the times t′″r kf(t
If l<1 (k is a constant), then c[t)==Amωct-Akf(9inωct).The first term in equation (2) is the key\rear,
The second song represents a balanced modulation wave, and it can be seen that in the range of kf(tl<1, the phase modulation is secondary or higher order) -〇 sideband waves can be ignored and can be modulated by a semi-solid modulator.Here, Icf(t)(
Let's consider the conditions for 1.

f it) −ab+nω+nt
- Equation (3) and substituting it into Equation (2) to rearrange it, c(t)=A[(135(uc t
+? (040010m) -αb(ωC-ωm)tl)
・・te(:ta. However, if mp−1<・a, the maximum modulation index is J−
0 On the other hand, by substituting equation (3) into equation (1) and expanding it to the first order with the first (:U Bessel function, we get <'1 can be considered as the range of <Il, '4/. Therefore, considering the values of l, l!1 German Bessel functions, from Figure 1, +11 p≦1.3...Equation (7) is Equation (6) is extremely good in the early modern era and is 1 N''L.

1 or more, it can be seen that below the reciprocity formed by the supporting fingers, it is possible to perform phase modulation by a balanced modulator. The ability to perform phase modulation with a balanced modulator means that the modulator/demodulator has a simple circuit configuration, and extremely stable phase modulation can be performed, and moreover, phase modulation can be performed in a variety of ways using quadrature two-phase modulation.

Now considering the upper limit of modulator i&mp, +1
The upper limit of 19 is determined visually, but when recording luminance No. 16 using the phase modulation recording method, preferably the upper limit of mp
≦10 In practical terms, nlp≦1.3. but,
Since the chrominance signal has a narrower band than the luminance signal, it is considered that even if there is crosstalk, it will not be too unsightly, so even in the case of normal phase modulation, it may be practical even with 1.5 degrees of RNP. - When force and phase modulation is performed using a balanced modulator, Pi
Since there is no secondary sideband wave in principle, it is considered that even larger MP than normal phase modulation can be tolerated.

Even if rnp is large, distortion will occur although the distortion will be improved, but this φ eye correction is possible. From the above, when recording color signals using the phase modulation method, the modulation index mp can be set larger than when recording color signals using a luminance signal. In particular, in phase modulation H recording of color signals using a balanced modulator, nl
If p≦1.3, there is an advantage that distortion correction is not necessary, and there is no problem of cross-steering.

Next, the two color difference numbers 45 (RY) and (B - Y) are modulated (change numbers), and As1
When llωct and A et ωat are phase modulated by a balanced modulator, the following equation t8) is obtained. However, R-Y).

Let the direct pressures of (BY) be ERY and EB-Y.

C) tit) -AclQJet H-y[
t), binωct ・Formula (8) CB[t) = A
binωct +AkBEB-y(t)cn-ωct
...Equation (9) However, in order to demodulate ER-Y +EB-Y in Equations (8) and 2 (9), CI
L(t) x sin ωct, CB(t)
If we simply multiplex it as (t) + (43(L)...2〇〇), it will be possible to use both the phase-based signals of sinωct and hωct to achieve the same signal. Caps that are in phase with these are included in C(t), which is inconvenient.

In the present invention, in order to remove the DC component of t, Caft1 and CB
(so that tl and tl are frequency interleaved with each other,
In order to use the vertical 1η correlation of the video signal and separate it with a comb filter during playback, either CR(t) or CBftl is inverted in phase in one horizontal scanning period, or one is inverted in phase in one horizontal scanning period. Ca(t)
and CB(tl are relatively phase-shifted by 180 degrees every horizontal scanning period. For example, Cft1=±(4[t)+CB(t)=±[Awωc
t −AJjEtoy[t) sinωc t ) ten[A
binωc t +AkB l;B-y[t) crsc
, +c t ]...20υ. In the case of demodulation, Ca(t) and CBit are obtained by delaying the adjacent horizontal 7 [Cit because the scanning line has a strong vertical correlation] by one horizontal scanning time, and performing addition and subtraction processing on the signals before and after the delay. ) and perform synchronous detection on each after separation. However, in the case of Equation (11), CB(t) can be obtained by applying pressure, or ±C with reduction of 1゛t.
aftl, so the phase reference signal used for synchronous detection must also have its phase inverted every horizontal scan so that it becomes ±ωat. The phase shift of the phase reference signal for each horizontal scan is such that, for example, Cr4t) is advanced by 90 degrees in phase for each horizontal scan (cog is also delayed by 90 degrees in each horizontal scan). , similarly necessary.The angle at which these phase reference signals are shifted for each horizontal scan is C4dt during recording.
It is determined according to the angle by which the phase of each subcarrier is shifted in each horizontal scan.If the phases of each subcarrier are not aligned in each horizontal scan, the separation described above will be incomplete, so the frequency of the subcarrier ωC/2
It is necessary to associate π with the horizontal scanning frequency Mf1. For example, in the case of a rotating disk, /1 frame is ωC/2π = n・fH and LL door)
In ri/1 field, ωc/2π= (n+3)u+
7! : t le.

To summarize the above, the recording method of the present invention transmits a carrier brightness signal, which is obtained by phase modulating the main carrier with a brightness signal, at least 4' at the recording position of the horizontal synchronization signal or between adjacent 7a tracks.
Color video is recorded on a magnetic medium so that the Q phase of the carrier between the video head and the magnetic medium is aligned. The first and second tracks are located in the same direction and have frequencies whose respective phases are aligned between adjacent tracks.
Phase modulates the cut carrier with one of the two color signals,
These two 0'L phase modulated color signals, that is, the two carrier color signals, are scanned one horizontal scan with at least one of the two carrier color signals and the first and second subcarriers to be phase modulated. The two carrier color signals are phase-shifted by 180 degrees each horizontal scan, and the two carrier color signals whose phase is relatively shifted by 1 soi every horizontal scan are multiplexed. , the recording position of this multiplexed carrier color 1d is at least between the adjacent tracks] 1) and the phase of each of the first and second subcarriers between the adjacent tracks is J, Recording the same way as you do is called holding a Buddha.

In addition, the reproduction method of the present invention is characterized in that the first recording medium has a frequency that is synchronized with the relative movement between the video head and the magnetic medium, is orthogonal to each other, and has a frequency that aligns each phase between adjacent tracks.
Phase-modulate the subcarriers of 2 and 2 with one of the two color signals 7, and combine these two phase-modulated color signals, that is, the two carrier color signals with the first carrier color signal to be phase-modulated with the two carrier color signals. and the second sub-carrier for each horizontal scan so that the phase of at least one of the second sub-carrier and
Two carrier color signals whose phase is shifted by 80 degrees are multiplexed, and the two carrier color signals whose phase is shifted by 180 degrees relative to each other for each horizontal scan are multiplexed, and this multiplexed carrier color signal is connected to the video head. A carry-in luminance signal obtained by phase-modulating a carrier with a luminance signal, which has a frequency that is synchronized with the relative movement between magnetic media and whose phase is aligned between tracks that are momentarily in contact with each other, is used at least when the recording position of the horizontal synchronization signal is between adjacent tracks. In this method, a color video signal is manually generated from a magnetic medium recorded in such a way that the phases of the main carrier and the first and second subcarriers are aligned between the I14 contact tracks. The carrier color signal multiplied by Mk is extracted, the carrier luminance signal is phase-demodulated by an arbitrary method, and the multiplied carrier color signal is multiplied by 1.
Addition processing and subtraction of signals before and after the delay by delaying the horizontal scanning time
The present invention is characterized in that it is separated into two carrier color signals by processing, and each separated carrier color signal is interpolated with a phase reference signal whose phase is the same as the phase shift during each recording.

By the way, the phase shift method of inverting the phase of CR+t) or CBft), leading it by 90 degrees, or delaying it by 90 degrees is to shift the output of the phase modulator itself to 1801
i, +/-90 to remove the force that shifts the phase, and the subcarrier itself to 1
There are methods of shifting the phase by 80 degrees and 190 degrees, but either method may be used.

The phase reference signal required for synchronous detection needs to absorb time axis fluctuations due to fluctuations in relative movement between the magnetic medium and the video head. One method is to keep the phase of the subcarrier constant since there is no signal component during the horizontal blanking period of the color signal. Therefore, during this horizontal blanking period, for example, P
Stable demodulation is achieved by inserting a burst reference signal such as the AL (pulse) method and installing an APC (automatic phase control) circuit during playback to obtain a continuous phase reference signal that corresponds to time axis fluctuations. I can do it. At this time, if the burst-like reference signal is made to have a different phase by 90 degrees every one horizontal scan period as in the PAL system, a switching signal that inverts the phase of the phase reference signal every horizontal scan during playback can be used. It is conceivable that there are cases in which the signal is recorded on a video track that can be obtained from the detection output of the APC circuit, and cases where it is recorded on an auxiliary track. Note that as a method of causing the first and second subcarriers to move at the same time as the relative movement between the magnetic medium and the video head, F
C (frequency generator) detects the rotational fluctuations of the output motor, etc. and controls the carrier oscillator, as well as recording the reference signal on a magnetic medium as in the creation of the phase reference E, and generates this reproduced signal itself. Alternatively, there is a method of using the output of an oscillator controlled by a reproduction signal as a gear, but if the frequency range of the auxiliary gear is high, using a signal is more accurate. Note that the frequency of the reference signal recorded on the magnetic medium is within the band between the carrier luminance signal band and the carrier color signal band, for example, 1.0 to 1.5 (2), or the carrier color (m number). If you keep the band below the band of 100-15
0 I()lz.

The recording and reproducing method for color video signals as described above tal
Since color signals are recorded by phase modulation in the same way as luminance signals, the influence of level fluctuations that occur during the recording and reproduction process, that is, A
Does not receive M noise.

(b) Since there are 11 phases of the subcarriers between the li4 tangent tracks, there is no crosstalk prevention even in high-density recording with bandless or partially overlapped tracks.

fc) Since the modulation index nlp is not very large, the sideband due to phase modulation is inherently narrow, and since it is multiplexed with 1u angle two-phase modulation, the occupied band is small even though all the color equal symbols of two loincloths are recorded. It doesn't get wider.

fd) Same (since mp is not very large, phase shift Il, 14 and demodulation are the same as modulation by a balanced modulator)
This can be realized by demodulation using wave detection, and the circuit configuration is simple and the operation is extremely stable.

(el) Furthermore, the phase of one force of the transport color 1d is inverted every horizontal scan, and both are phase-shifted by 90 degrees in the opposite direction to multiplex them, and addition and subtraction processing is performed during playback. Since it is separated, color TV Noyon PA
As with the L method, even if there is a time axis variation, it is canceled out between two scanning lines and is not affected.

ffl Since the phases of not only the main carrier but also each of the subcarriers are aligned between the momentary contact tracks, and the recording position of the horizontal synchronization signal is also one beat between adjacent trunks, in the recording and reproduction of still images, the reproduction from - force to external force ili ! The screen is not disturbed unless the ii image is switched, and the two images simply do not overlap temporarily. Furthermore, the same problem occurs even if the magnetic medium is deformed due to a change in the tW and an off-trunk occurs in still image playback, which straddles adjacent tracks. Similarly, there is no screen disturbance during slow motion/playback.

Next, an embodiment of the present invention will be shown with reference to FIGS. 2 and 3. FIG. 2 is a block diagram of the recording system. From the output of the oscillator 1 (for example, 756 Kl(z) corresponding to 48 fH), the phase shifter 2 converts the output of the oscillator 1 into a three-barrel signal IJ7-A=ωCt,
Acrsωet and ASjnωct are created.

The balanced modulator 3 receives one color signal E, -y (t+ and -As
i + m (input t to create a balanced modulation wave, add A + ct to it to create a carrier color signal Cx4t), input this to the inversion circuit 4, and invert the phase with a rectangular wave of 2'l ( The other color signal EB-y(t) and 15cxbωCt are input to the other balanced modulator 5, and Asl11ωct is added to this balanced modulation wave to generate the other carrier color signal Cdtl. ±(4(t) and CB(t) are multiplexed by the combining circuit 6, and then combined with the phase-modulated carrier luminance No. 16 Cy(t) and the output signal fP, and this signal 21 is sent to the adjacent track. Recording is performed so that at least the recording positions of horizontal synchronizing signals are aligned between adjacent tracks, and the phases of each carrier of AamrCt and As"ωct and the main carrier are different from each other (l]lI between adjacent tracks. Pilot signal IP is recorded so that the recording position of the horizontal synchronizing signal is aligned between carriers AS"ωct The frequency is divided by 8 by Kara/R7, which is 6fH, or 94.51 (Jlz).The carrier oscillator 1 is the auxiliary track switch or has already been recorded. The carrier phase between adjacent tracks is changed by synchronizing the pilot (g+f¥ and (I′L4tj) obtained by reproducing the button).
In order to achieve this, a voltage controlled oscillator (VCO) la, a counter 1b, and a phase comparator IC are used.

Transport! ...! The degree signal is not shown, but it is the same as in the conventional phase modulation recording method.

FIG. 3 shows l) raw silk corresponding to FIG. 2, and reproduced signal 2
2, the carry-in luminance No. 16 Cy(t) is inputted to the conventional PM decoder circuit 9 through the branch II bus filter 8, but the multiplexed 1st general color filter Q C(t)
It is extracted by the Hapanotopass filter 10 and input to the delay line 11 for one horizontal scanning time. The human output signal of the delay line 11 is given to the attenuator 12 and the adder 13, and ±Cn1t) and CB
it) and input each to a balanced modulator 14.15. The phase reference signals given to each balanced modulator 14 and 15 are ωat and ωct, which are generated by a 48 fH oscillator 16, a phase shift circuit 17, and an inversion circuit 18.

In detail, the output of the pressure-controlled oscillator 16a is divided into 8 by the color/reference signal 16b, and this and the pilot signal extracted by the bandpass filter 6c are combined with the phase comparator 16.
The phase of the oscillation output is controlled by comparing the 6r phases at d, and this oscillation (
The output power generates a phase reference signal of sinωat and low ωat, and ■ωat is applied to the balanced modulator 15, but the sub-ωat is controlled by the inverting circuit 18 controlled by the rectangular wave of ↓fH.
The signal is then converted to ±sinωat and then applied to the grain modulator 14.

The output of each balanced modulator 14, 15 is filtered through a low pass filter 19.
．． When passed through 20, the carrier and primary components are removed and the result is E+.
ty(t) and EB-yl) color signals are obtained.

FIG. 4 shows an embodiment of a reproduction system in which a burst-like reference signal is inserted so that the phase differs by 90 degrees during each horizontal blanking period N1KI horizontal scanning period. The recording system is the same as in FIG. 2 except for the insertion of the burst group 4I signal, and is therefore omitted. In Fig. 4, the same parts as in Fig. 3 are marked with ``11'' to indicate duplication. The station pulse circuit 23 inputs the horizontal synchronizing signal 24 and outputs a pulse 23a having the width of the horizontal blanking period, and the station pulse circuit 23 is open while receiving the horizontal blanking pulse 23a. Then, a burst-like reference 1 symbol 25a is sent to the C circuit 26. A
PCI! ,! In the circuit 26, the phase detection circuit 28 compares the phase between the VC□ (positive pressure control output (narrow ≧ 5) output 27) output 27a and the human-powered reference (J 25a), and the output 28a controls the VCO 27. control (by j) 7-
The excavation output 27a is in the same phase and the same frequency as the strike-shaped base No. 14 25a.

This output] damping output 27a is a constant phase reference signal (convex (υ
at). On the other hand, the flip-flop 30 uses the horizontal synchronization signal 2.1 as a clock, and the phase transverse wave circuit 28 of the APC circuit 26 resets its phase (f- detected by the detected signal 13 28b) every time the burst reference signal 25a is input. The switch 31 is switched by the output of this flip-flop 30 every horizontal scan, and the output 27a of the VCO 27 (the output 27a of iJ4 and the output 32a passed through the 180 degree phase shifter (inverting circuit) 32 is 1 and a half Balanced modulator 1 across 17- to throat scan jU
4, and the r phase standard (g) is ±sJoωct.

[Brief explanation of the drawing]

Figure 1 is a graph showing the variation of fIM of the Bessel function,
FIGS. 2 and 3 are Glock diagrams of a recording system and a reproducing system showing one example of feeding of the present invention, and FIG. 4 is a Glock diagram showing another example of the reproducing system. In the drawing, Ert-y(t) and EB-y(tl fJ, color signal, ±
Ca(t) and Cu(tl are (general color feed signals, CY(t) are carrier module IPL i1(number), C(t) are multiplexed carrier color signals, A 5in(Ll c t and AC 'bωcL is the sub-gear, ±inωct and ωct are the phase reference signals, fp and fi
I is a reference signal, 1 and 16 are oscillators, 2 and 17 are phase shift circuits, 3.5.14 and 15 are balanced modulators, 4 and 18 are Vi inversion circuits, 9 are ViPM demodulation circuits, 11F'i1 are horizontal scanning time Delay line, 12-digit adder, 13 is subtracter, 21 is record No. 48, 2 2 #, L 74 Raw 15 guns (Yoto, 23 is G°
- Tobals circuit, 24 is horizontally open] () No. 115, 2 5 i, 1 Standard No. 11 Ri--H [J road,
26 is an APC circuit, 30) is a 32μ inches long.゛Parental Applicant Fuji Shasei Film Co., Ltd. Representative Patent Attorney Mitsuishi Shibu (and 1 other person) L Addendum 11: Sho f++ 574t 9 If /4 L+4 Shin i'
r r icho' Hakuden 1, 'll+'uminoru, ], ur+m57・j patent 1 137375 blasphemy":i
fll ・l Trial No. 2 Name of the invention Recording and reproducing method of color video signal % Formula % Ig with l111 Patent applicant Fuji Photo Film Co., Ltd. 41, 210 Nakanuma (520), Hosashigara City, Kanagawa Prefecture Prefecture: (History 1 "Yumi 107 Same place spontaneously" 6. Column "i7: MfJ explanation of the invention" of the specification subject to amendment. 7. Contents of amendment (1) Page 6, line 17 of the specification "Recording decimation 1-r, that is, line sequential and frequency modulation (FM)"
"So," he corrected. (2) Correct "thinning" written in the first line of page 7 of the Akira #lJJ book to read "line 1 old". (3) Correct it to ``Phase modulation 1 go/``Phase change quick kneeling'' written on page 11, line 3 of the detailed description. (4) As stated on page 11, line 3 of specification ①, [in addition, the right angle two-phase transformer jkrL is also mentioned.
I am corrected by saying, '(5) "This horizontal blanking line... then during playback" described in page 17, line 18 to page 18, line 5 of the specification. (
Synthesis of the first and second auxiliary gears) APC (automatic phase control) four-way is provided as a full burst reference signal to obtain a continuous phase reference signal that corresponds to time axis fluctuations. Able to perform tuning. In this case, by inverting the phase of one subcarrier every time kl horizontal scanning gate, i'L, the phase of the above-mentioned cross-shaped reference/number 1g is the same as that of bursts 1 and 4 in the PAL system. Each horizontal stroke period differs by 90 degrees. Not only does it have the advantage of being more resistant to time axis fluctuations than VC, but it also has the advantage of 4+li. (6) “Registered on page 19, line 2 of Specification 1
"Signal" is corrected as "Signal with no phase". (7) Correct it to ``Figure 2 ζ-IJ gold ``Figure 2 is 1 to 9' / 17 to eno (g) rr reference signal'' written in the 5th line of page 21 of specification ψj. ( 9) Book of Mingvl111, page 23, lines 17 to 24
The first line of the page is written [Fig. Figure 4 shows a fourth embodiment in which the horizontal blanking period is used as a non-modulated synthetic gear reference signal.This is the same as in Figure 2 of the recording system, so it is omitted. ''. -ri 1- Ding Continuation Supplement II: Book Showa 581-6 'I 7 ++ 1, effect' 11) Mr. Secretary], ・lit"lJ") A, small + 1X + rll 57 il % FF
IC□l+T, 137375! Uaki+1
1:+; Tomihan No. 2 Name of invention Color video (Complete recording and reproducing method of No. City Nakanuma 210 Site (520) TJLI Photographic Film Co., Ltd. 4 Agent'\ Post 1 History Number 1; Between "It may be possible to record it on a rack..." and "No," written on page 18, line 3,
``In the case of the master (because there is no mutual interference between No. 8),
For both of the f4 degree signals with one color and the phase signal during reproduction, the signal on each center frequency signal can be multi-electronically distributed as a phase M: quasi-quadrature signal, which simplifies the apparatus. ” Insert the text @ more than /

Claims (2)

[Claims] (1) A color in which a carrier luminance signal obtained by phase-modulating the main carrier with a luminance signal is recorded on a magnetic medium so that at least the recording position of the horizontal synchronization signal is aligned between adjacent tracks and the phase of the main carrier is aligned between adjacent tracks. In a video signal recording system, first and second subcarriers are synchronized with the relative movement between the video head and the magnetic medium, are orthogonal to each other, and have frequencies whose phases are aligned between adjacent tracks. One of the two color signals is phase modulated, and these two phase modulated color signals, that is, two carrier color signals are combined with the two carrier color signals and the first and second subcarriers to be phase modulated. The phase of at least one of them is shifted every horizontal scan, and the phase is shifted by 180 degrees relatively every horizontal scan. A color image characterized by multiplexing two corresponding carrier color signals No. 16 and recording the multiplexed carrier color signals so that the phases of the first and second subcarriers are aligned between adjacent tracks. Signal recording method. (2) In synchronization with the relative movement between the video head and the magnetic medium, the first and second subcarriers, which are orthogonal to each other and have frequencies whose respective phases are aligned between adjacent tracks, are used as one of two color signals. These two
two phase modulated color signals, that is, two carrier color signals, by shifting the phase of at least one of the two carrier color signals and the first and second subcarriers to be phase modulated every horizontal scan. Two carrier color signals whose phase is shifted by 180 degrees relative to each other for each horizontal scan, and the phase is shifted by 180 degrees relative to each other for each horizontal scan.
Two carrier color signals whose phases are shifted by 80 degrees are multiplexed, and this multiplexed carrier color signal is used. The main carrier has a frequency that synchronizes with the relative movement between the video head and the magnetic medium and is in phase with adjacent tracks.
A carrier luminance signal obtained by phase modulating the ilfli signal,
A color video signal is generated from a magnetic medium recorded in such a way that at least the recording position of the horizontal synchronization signal is between 14 contiguous tracks (ii) and the phases of the main gear and the first and second sub carriers are aligned between adjacent tracks. In this method, the carrier luminance signal and the multiplexed carrier chrominance signal are extracted from the reproduction output of the video head, and the carrier luminance signal is phase demodulated by an arbitrary method, while the multiplexed carrier chrominance signal is delayed by one horizontal scanning time and separated into two carrier color signals by adding and subtracting the signals before and after the slow study, and each separated carrier color signal is shifted in phase to the same phase as that during recording. A color video signal reproduction method characterized by demodulation using a phase reference signal.