JPS5897990A - Pal signal reproducing device - Google Patents

Abstract

PURPOSE:To allow a reproducing head to track normally or jump by performing multiple recording of a pilot signal to each video track through a pilot signal recording circuit and detecting the pilot signal through a reproduced pilot signal detecting circuit. CONSTITUTION:A reproduced pilot signal is led from a terminal 36 to a converter 38. pulses synchronizing with head switching are supplied from a terminal 37 to a selecting circuit 44 as a control signal, and a pilot signal generating circuit 34 switches pilot signals f1-f4, in every fields, to lead them as the carrier signal of the converter 38. As the carrier signal, f2 or f3 for a channel A, or f1 or f4 for a channel B is selected. In this case, the difference frequency between the reproduced pilot signal and carrier signal of the output of the converter 38 is led to tank circuits 39 and 40 and an output is obtained from a differential amplifier 41. The zero-cross point of this output is obtained through a limiter 42 and used as a jump control signal JP.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording/reproducing apparatus for a color video signal in which the modulation format of a carrier color signal differs every horizontal period, such as superimposed I1I11#i and PAL color video signals.

In a device that records and plays back general KPAL video signals, one track is recorded for each field on the a-key tag, and depending on the number of deviations (αI) in H of the friend recording track, special playback such as search or still can be performed. In this case, the color synchronization section of the receiver is disturbed, resulting in inconveniences such as one color not appearing.

For example, like the PALs time record of VH 50,000,
αx = (Rue 0.5)B (However, % = 1.2゜3,・
), H-alignment must be done.

And, as mentioned above, it does not cause any inconvenience.

#! Figure 1 shows the magnetic tape (
This is the recording track pattern. In figure 41,
1, 2. S, ~625 represents company line number, A1
* A@e A3 + ... indicates the channel A track / Yt * B1 + B signal * B field ... indicates the video track of channel B, and also the carrier color in the chroma signal of the PAL system In the signal, the phase of the RY component is inverted every horizontal period (hereinafter referred to as IJf).

#! In Figure 1, the diagonal 1IjitIfA line is -
In this case, the (RY) component indicates that the R-Y component is recorded on the line that is not shaded.

The R-Y component and the -(R-Y) component are aligned in am with respect to the track extension direction, and during special playback such as search or still playback, the R-Y component and the -(R-Y) component are always aligned. Each line is played alternately. WJ2 Figure Fi shows a reproduction signal when the recording track pattern of Figure 1 is searched and reproduced.

2a is the reproduction signal from channel AK, 2 is the reproduction signal from channel B
It is a video signal by VC, and as described above (RY component and -
(RY) components are alternately reproduced.

Normal reproduction 111i[il can be obtained.

11tf:,, αg=nE (Start, 3!1.2,
5°...) will be explained. Figure 5 shows 0=t
This is a recording track pattern on a magnetic tape in the case of OR. In this case, is it different from the example in Figure 1? ), R-
, Y component and -(R-Y) component extend alternately every two tracks and are arranged perpendicularly to the longitudinal direction. Therefore, during special playback such as search or still, the playback head is positioned on one track. Play the track that skips the minute. A so-called track jump occurs, in which the RY component and the -(RY) component are swapped, and the chroma signal becomes discontinuous. Figure 4 shows the reproduced signal when the recorded track pattern of Figure 5 is searched and reproduced. This causes the inconvenience of color fading.

In addition, in the case of the example shown in Figure 5, <α# = n E, R alignment cannot be achieved, and the crosstalk component played from the *close video track becomes more noticeable on the iii screen, resulting in a deterioration in the image quality. This is particularly noticeable during special playback of #'i, t-chi, and stills.

Therefore, in this case, H alignment can be achieved by shifting the two rotary heads by 0.5H from the position of K 180 when installing the two rotating heads.
Please do as above.

αz=(ycf(15)#), and in Figure 5 αf=
This is a recording pattern when (1fO, 5)H is set.

Moreover, FIG. 6 shows the case where αg=(2±0.5)H.

In the case of FIG. 6 as well, as in the example of FIG. 3, one color disappears due to the discontinuity of the chroma signal at the track jump point during search or special playback of still tracks.

As a means to resolve the inconveniences mentioned above.

IH:)71enli1 is used for the Imao circuit of the chroma signal,
There is a method to switch the chroma signals before and after the 1H delay line at the track jump point.For example, if the R-Y component is played back again following the R-Y component at the track-jump point, the I El ! The chroma signals before and after 11All are switched and replaced with the chroma signal 1B before or 1H after K, that is, the =(RY) component υ, and the discontinuity of the chroma signal is corrected.

However, the problem here is the means for detecting the above-described trouble jump point.

In FIG. 7, a conventional technique for detecting a phase step of 90 [71?] of a burst signal generated at the time of a track jump is used as track jump detection means. In FIG. 7, which shows an example of a reproduced chroma signal processing circuit of the PAL system,
1#'i burst flag pulse Pf input terminal, 2#
'i Input terminal for low frequency converted a signal with carrier frequency fL during playback.

5 is the horizontal synchronization signal input terminal, 4 is the playback mode signal input terminal, and 5 is #! 1 converter, 6 comb filter, 7 1B delay line, 8 #! 1 is a changeover switch, 9 is a second changeover switch, 10 is an output terminal for the corrected reproduced chroma signal, 11 is a second converter, 12 is an APC circuit (automatic phase control circuit), and 13 is an AFC circuit (automatic phase control circuit). wave number circuit).

14 Fi oscillation circuit, 15 a first phase shifter, 16/fi second phase shifter, 17 a third changeover switch, 18 a burst gate circuit, 19 a phase comparison circuit, 20 an integration circuit,
21 is a voltage comparison circuit, 22 is a monomulti, 23 is an aripp flag circuit, and 24 is a REF signal generator.

25 is an AND circuit, and 26 is a track jump pulse generation circuit (hereinafter referred to as an IP generation circuit). - First, the operation of the first circuit will be explained. The low-frequency converted chroma signal from the input terminal 2 is converted by the first converter 5 into a signal with a carrier wave frequency fs of approximately 4.45 MHz, which is passed through a comb-shaped filter 6f, the first switch 8, and a 1B delay lI.
Guided by M7. The first switch 8 is used to switch between the input side and output side a'v signals of the 1B delay circuit 7, and is switched every time a discontinuity in the Ω signal occurs during a track jump, and the discontinuity is eliminated. The corrected chroma signal is guided to the second switch 9.

The switch 9 of fI2 replaces only the burst signal from among the signals from the switch 8 of $1 with the reference signal from the fifth switch 17 in response to the burst flag pulse Pf from the input terminal 1. Fifth switch 17
The reference signal from .

The phase difference between the reproduced chroma signal and the carrier wave for each line is 155
[/ 225 [] and the signal switched to 69. This signal is similar to the PAL burst signal.

The chroma signal thus summed and discontinuity corrected is led from the output terminal 10 to a mixer with the Takasei rjIL signal.

Next VC, surrounded by a broken line. Track The Young Pulse (J
The P-times signal generation circuit 26 will be explained. #! The burst signal from the switch 8 of No. 1 is sent to the burst gate circuit 18.
The signal is guided to the 1-phase comparator circuit 19 through the . Here, a reference signal similar to the burst signal is phase-compared, and a burst signal e is generated when the 0R-Y component and the -(R-Y) component of the reproduced chroma signal are no longer aligned with each other every two inputs. ) 90F: Phase step v: f f- output, this detected pulse is integrated by the integrating circuit 20, and the voltage comparator circuit 2
1, the output of this integrating circuit 20 is compared in level with the REF signal from the REF signal generation circuit 24, and the detected signal is equal to or higher than the level of the REF signal.
2, -10,000 returns to the integrating circuit 20 and discharges the integrated signal.

The other signal is led to the AND circuit 25 through the 7-ring 7a-lig 25, and is ANDted with the reproduction mode signal from the input terminal 4.
However, in the conventional example described above, shadows such as missing burst signals caused by dropouts, etc., do not cause errors in track jump detection. erroneously corrects the discontinuity of the chroma signal. In order to eliminate this correction malfunction, the REF signal generation circuit 24
It is necessary to switch the level of 0REF@.

[L The level of this REF signal depends on the head track width, video track pitch, etc., and setting it is difficult and requires a large circuit. First-order compatibility is extremely difficult to achieve.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art as described above and to provide a circuit that can accurately detect a track jump point t- with a simple circuit.

One aspect of the present invention is to achieve the above object.

The circuit for recording pilot signals multiplexes the pilot signals in the vicinity of each video controller, and the circuit for detecting the reproduced pilot signal performs searches and special playback of still images.

Detect where the playhead jumps on the video track. Furthermore, during no-mill playback, the upper Md high a signal can also be used to detect a control signal that causes the playback head to properly track the main track.
Cost performance can be improved.

First, as an example of the present invention, a case will be explained in which four chest waves 1 are used as pilot signals recorded on each video track.

Here, the 4-frequency pilot signal is given as kIt.

fs = fs-1, and select each wave number so that the following relationship holds true: °゛fs - fs `` fI - fs '' k・fx ・
...(1) f island - f, = f number -ft := evening 1 fI ......-+1) k waman
River... River... 13 squares, f
x is one water period frequency, and *Id is positive.

It was. The pilot signal recorded on the channel A track is tft,f*, and the pilot signal recorded on the channel B track is f,.

Select f.

As an example of a pilot signal that satisfies the above relational expression,
&=1. Book: 5, fl = 45fz, f, =
7.5 fi, f@ =9.57'1. fl='α
There is 5jx. Further, as another example, j=1. @=3, f=:6.88fH.

f = zaOfx, f, = 9.75 fx, 74
It is also possible to choose =10.64 fx.

FIG. 8 shows an example of a circuit for recording the above-mentioned pilot signal on each video track. Input terminal, input terminal for pulses synchronized with 29Fi head switching, 30 is W, 1 mixer, 31 is a second mixer.

52d is a recording amplifier, 33 is a recording head, 64 is an i-pilot signal generation circuit, and 55 is a selection circuit. The first mixer 30 mixes the brightness FM signal and the low frequency converted chroma signal, and the mixed signal is guided to the second mixer 31. - 10,000, pilot signal generation - Pyro from Route 34.

The output signals f, .

→f, and are sequentially selected so as to make a round, and are led to the mixer 31 of $2. However, in this case, at the head of channel A, pilot signals i, , i.

However, at the head of channel B, f, , f, are selected. In the second mixer, the above-mentioned brightness FM signal and low frequency chroma signal are mixed with the pilot signal,
Head through Record Anne 132! 13 and recorded on A1 tape.

In this way, the video track pattern of the recorded pilot signal is shown in FIG. - represents the video track of channel B, using FIG.

The principle of detecting track jump points during 6x speed search playback will be explained. In general, in VTRs that do not provide guard bands, an azimuth recording method is used for rounding to suppress crosstalk components from video tracks that are arranged in a single track. G? eI
In J, playback heads A and B have the same azimuth as the heads that recorded video tracks t--of channels A and B, and mainly reproduce signals recorded on video tracks of channels A and B, respectively.

In addition, the tracking turns of each head are shown on the bottom.

FIG. 10 shows an embodiment of the track jump point detection circuit in the above embodiment. In Figure 10, 3
6 is an input terminal for the reproduction pilot signal f, 37 is an input terminal for pulses synchronized with head switching, 38 is a converter, 39 is a first tank circuit, 40Fi is a second tank circuit, and 41 is a differential amplifier.

42 is a limiter circuit, and 43 is the output terminal of JP1.

44 is a selection circuit.

FIG. 11 is an explanatory diagram of the operation of the embodiment shown in FIG. 10.

In the eleventh factor, 11G is the FM envelope 1 waveform of the head Hatake signal during t-chi reproduction shown in FIG. A
, , A, , A Hatake, B4 represent the respective video tracks, the arrow 11h is the track jump point, and the envelope o
-7 waveform 11g is the minimum.

It corresponds to the point where . In this case, in general, the frequency of the pilot signal f, ~ is lower than the frequency of the low-frequency conversion signal a,
Since the azimuth effect of the head cannot be expected, the level of the reproduced pilot signal from the head is almost constant, and the maximum level of this reproduced pilot signal is at a frequency of 110. . As shown in this 11C, the regenerated pilot signal is input to the input terminal 5.
6 to a converter 38. Input terminal 37 to 1
14 synchronized with the head switching is guided as a control signal to the selection circuit 440, and is switched from the pyro signal generating circuit 34 for each pilot signal field f, to f&t, and is guided as a carrier signal of the converter 58. Here, the carrier signal is the head of channel A, as shown in 11d.

During reproduction, the nine pilot signals f1 or f recorded on channel track BK are used, and when the head of channel B is reproduced, the pilot signal f recorded on channel track A is used.
For 1 or 9, choose 7at. In this case, the difference frequency between the reproduced pilot signal and the carrier signal in the output of the converter 58 is 11-. If the chest wave number is selected to be 4x and door/fH, the output of the differential amplifier 41 will be 11f. In order to detect the zero cross point of the output 11f of this differential amplifier 41.

11! to the output terminal 43 through the retarder 42! Notoku J
P damage signal can be obtained.

In the example of FIG. 9, the order in which pilot signals are recorded is f
, -, f, → f4 → f, but in this case, during special playback, the selection circuit 44 in FIG. f, −f.

By selecting →f in one cycle, it is possible to detect IP flaws regardless of the search speed.

In the example of Fig. 9, , πCI'y) signal [
The recording order may be selected as if it goes around fs→f,→to→f, and in this case, during special playback, the order in which the pilot signals are switched by the selection circuit 44 is set to fs.
! → 8 → → m → 8 de to choose, I
P signal can be detected.

The above describes the ttC at the time of search playback. Similarly, it will be explained that even during slow playback, it is possible to detect one point of shift according to the present invention.

Figure 12 shows an example of the tracking pattern of the reproducing head when reproducing one 1/2 screen. The method of recording pilot signals f1~ is the same as that for the 8th prisoner.

In Fig. 12, the fil line indicates the tracking of playback head A, and the dashed line &l indicates the tracking pattern of playback head B. Playback heads A and B mainly play back channel tracks A, 5, and B, respectively. .

By using the JP signal detection circuit shown in FIG. 10 in the same manner as in the case of t-chi, IF signal detection becomes possible. 415- is an explanatory diagram of this JP signal detection operation. In FIG.

13a is the FM envelope 1 waveform during curing.

As in the case of T-chi playback, there is a track jump point 15A at the minimum point of the FM envelope ct-ya. 13C represents the maximum level signal component of the reproduced pilot signal (F)
, 15d is the carrier signal from the selection circuit 44, 1! - is the difference frequency of the converter 38, To? ), differential amplifier 41
A signal like 13f is obtained as the output signal. Therefore, a JP flaw signal of 15 m can be obtained at the output of the printer 42.

Here, the frequency of the carrier signal 15d from the 1 selection circuit 34 is the same as that at the time of search playback, K is fl or fst for playback head A, and @K11tf for playback head B.
The selection of l or f and the switching order for each field of the carrier signal 13d depend on the recording order of the pilot signal, and are the same as in search playback. This allows Qi 1
JP flaw signals can be detected even during slow playback at different feed speeds.

Still playback will not be explained here, but it is clear that still playback is when the tape feeding speed in slow mourning mode is slowed down to the maximum, and that the IP times signal can be detected in the same manner as slow playback.

As described above, one embodiment of the present invention uses K and T without any control for each mode.

Track jump points can be detected in all modes of special playback. JP flaw signal 1 detected in this way
For example, by using the first switch 80 as a control signal in FIG.

1M of chroma signal! Sequentiality is maintained at f-legs and one color disappearance is corrected. - In the above embodiment, pilot signals 11 to 8 are recorded over the entire video track.

However, in the present invention, it is not necessary to record the pilot signals f1 to f4 all over the video track, for example, during horizontal synchronization or during the front porch period.

~The pilot signal f is intermittently recorded as if recording f&.
, ~f4t- may be recorded and the pilot signals f, ~f4 that are intermittently reproduced during reproduction may be used.

Figure 14 shows the above and <pilot signal! , ~f4 is intermittently recorded. The difference from the example shown in FIG. 10 is that a hold circuit 44 is provided on the output side of the differential amplifier 41. This hold circuit 44 uses a gate signal to guide the differential amplifier output only during the pilot signal detection period, and holds the differential amplifier 1 output level during the detection period outside the detection period. By doing this, it is possible to accurately detect the K ) 5 y Kuji Young point as in the previous embodiment.

Next, in the case where a pilot signal is intermittently recorded on a video track in the present invention, an embodiment in which the pilot signal has a frequency f of t-1 as the most notable example will be described. #! Showing an example of a Qi 1 pattern in which a local pilot signal fo is intermittently recorded. In Fig. 15, As, 4*As indicates the video track of channel A, and B, 4*As indicates the video track of channel B. The thick line is 4B in one track.
The pilot signal f is intermittently recorded every time. Recording # is controlled in advance so that the pattern of the recorded pilot signal is as shown in Figure 915.

FIG. 16 shows an embodiment of a track jump point detection circuit when the recording tape pattern shown in FIG. 15 is reproduced. In FIG. 16, 45 is an input terminal for a reproduced pilot signal, 46 is an input terminal for a control signal that gates the pilot signal, 47 is an input terminal for a pulse synchronized with head switching, 48 is a gate circuit, 49 is a hold circuit, and 50 51 is a selection signal generation circuit, 51 is a mixer, 52 is an inverter, 5sij switch circuit, 54 is a limiter circuit, 55 is a 7-bit 1-flop signal output terminal, and 56 is a JP multiplication signal output terminal.

*flAK in which a track jump point can be detected will be explained using an embodiment shown in FIG. It.

Channel A playhead when searching.

Assume that video track 4 is being played back as the main track. In this 41st case, the reproduced pilot signal is intermittently gated by the gate circuit, and after the IH of the abundant pilot signal from the video 1 track A, the reproduced pilot signal from the video track is gated, and its output is gated by the hold circuit 490P. , the playback pilot signal from video track B1 is gated after the 0th order 1B held in .

The output is held in a hold circuit 490P.

Similarly, the level of the reproduced pilot signal from video track '4t or A1 is VC held. The respective hold signals are subjected to level calculations of P, -F, and 10 Ps in a mixer 51, and are led to a limiter circuit 54 through a switch 5-5. Figure WJ17 shows the level calculation outputs of P, -P, +Ps and the amount of deviation of the playback head from the main track.In Figure 17, 17α is for playback; (Deal)
, 171J are located at the center of video track B), and the interval between 17 and 17h corresponds to one track pitch. Furthermore, the dashed line indicates the time when the channel A playback head is used, and the broken line indicates the time when the channel B playback head is used.

By passing the above level calculation output through the divider 54 and guiding it to the gate 70 155 which is driven by the falling edge,
The output terminal 56 outputs the JP signal at which the playback head detects the point where the playback head is located on video track 9, that is, the track jump point.
You can get twice the signal. This JP double signal selection signal generation circuit s
OK @ left, change the hold circuit 490 to 2 1 timing. Also.

At the time of the reproducing head of channel B, the output of the mixture@51 is guided to the limiter 50 through the inverter 52Yr.

As described above, the track jump point can be detected correctly even when the pilot signal is 1JID wave.

FIG. 18 shows a tape pattern diagram of another embodiment in which a one-frequency peak signal fat is recorded intermittently.
In Figure 15, the pilot signal is 2 on each track.
The pilot signals shown in the thick and diagonal lines are recorded intermittently every time, and the phase of each pilot signal is 180 [14]. Further, the pattern of the recorded pilot signal is controlled in advance during recording so that it becomes as shown in FIG.

FIG. 19 shows an embodiment of a track jump point detection circuit when the recording tape pattern shown in FIG. 18 is reproduced. In FIG. 19, 57 is an input terminal for a reproduced pilot signal, 58 is an input terminal for a pulse synchronized with head switching, and 59 is an input terminal for a gate control signal of a 21-cycle pilot signal.

60 is an inverter circuit, 61 is a switch circuit, 62 is 2
Bj! processing line, 63 is an adder, 64 is a subtracter, 65 is an LP
F, 66 is the #11 gate circuit, 67 is the second gate circuit, 6B is the first hold circuit, 69 is the second hold circuit, 70 is the differential amplifier 1. C is limiter circuit, 72 is JP
The No. 1 output terminal 73 is a 1H slow resistance circuit.

The principle by which a track jump point can be detected according to a nineteenth embodiment will be explained. Now, assume that the playback head of channel A is playing the video track "at the main track" during the search. In this case, the playback pilot signal passes from the input terminal 57 through the switch 61 and is output with a 2H delay. a & 62, an adder 65, and a subtracter @64.Here, the output of the adder 63 is the reproduced output of the pilot signal recorded on the track of channel A, and the output of the subtracter 64 is The reproduced output of the pilot signal recorded on the track of channel B is obtained as the output of the adder 63.
5 all in all 1st. Leading to the second gate circuit 66.67@,
Here, the gate signals of 2B intervals from the input terminal 59 and the 1
#: Due to the dirt signal delayed by p1H due to M extension line 75]
Gutoshi, respectively 1st. Therefore, the first hold circuit 68 receives the reproduced pilot No. 46 from the video track A8.

The second hold circuit 69 has a video) ') w /A
The regenerated pilot signals from @ are held at their respective peaks. By leading these two peak hold outputs to the differential angle 0, the differential angle skewer has a positive polarity when the playback head is on the video track A, and a positive polarity when the playback head is on the video track As ill K. When K is jjL, a signal is obtained. Therefore, by passing the output of the pin through the limiter 1 path 71), the output terminal 72 is connected to the pin 11! An IF flaw signal similar to that can be obtained. (9) When the reproducing head is channel B, the IF flaw signal can be similarly detected by guiding the reproducing pilot signal passed through the inverter circuit 60f to the above-mentioned 2H comb filter.

In the present invention, the pilot signal is 41ila as an example.
c) case and the case of one frequency will be explained. However, it goes without saying that cases of five frequencies and two frequencies are also possible.

In addition, only the case where the JP multiplied signal indicating a track jump point detected by the present invention is used to prevent a chroma signal from being outputted normally during special playback such as search or still will be described here.

Other observations are the JP double signal position and the reproduced FM signal's envelope a-1.
Since the small and small points of the waveform match, it can be used as a control signal for noise suppression during still operation. Furthermore, it can also be used as a drone 1-out detection signal during a search.

Also, if H alignment cannot be achieved and skew occurs during search or special still mode.

It can be used as a control signal for skinny compensation.

Furthermore, the pilot signal used in the present invention can also be used for auto-tracking.

According to the present invention, in a PAL color video signal recording/reproducing apparatus, αi%(n-α5)B(ft + n
=1.2. If you use a recording method other than ...),
C1x=nH or αx=(s-α5)B and (n+
By switching α5)H for each track, it is possible to easily detect the track jump point of the playback head during special playback such as stills during search, and in special playback modes such as search and still, or in the αI cage. It is not necessary to roughly cut the @ sign, and it is possible to ensure good compatibility and a normal internal p of the chroma signal, thus solving the problem of not having one color attached.

Furthermore, the present invention can also be used as a pilot signal used for auto-tracking during normal mourning, thereby reducing costs.

[Brief explanation of drawings]

Figure 1 is a diagram showing the recording tape track pattern when αz=tsH in the PAL system, and Figure 2 is the recording tape track pattern of Figure @1 [a diagram showing an example of a playback signal when searching and playing. FIG. 5 is a diagram showing a recording tape track pattern when α1r=1Ho, W, and FIG. Figure 5 shows αI
=(A diagram showing a recording tape track pattern in the case of 15/15H, FIG. 6 is a diagram showing a recording tape track pattern in the case of αN=1572.5H, and FIG. 7 is a diagram showing the recording tape track pattern in the case of αN=1572.5H. FIG. 8 shows an example of a circuit for correcting the discontinuity of the Kukuma signal in FIG. pattern and 6
FIG. 10 shows a practical example of the JP detection circuit using a pilot signal. FIG. 11 shows the operation of the IP detection circuit during 6x search playback. Figure 12 is a diagram showing head tracking during 1/2 slot rise, and Figure 1S is a diagram showing head tracking during 1/2 slot rise.
To explain the operation of the lp @ output circuit during 1/2 slot playback, Fig. 14 is a diagram showing an example of the IP detection circuit when a 4-wave pilot signal is intermittently recorded, and Fig. 15 teeth,
A diagram showing an example of an actual IIrA in which a pilot signal of one frequency is intermittently recorded, No. 161 is a JP of an example shown in the 15th factor.
FIG. 17 is a diagram showing one embodiment of the detection circuit. Circuit operation of FIG. 16 t-Explanatory diagram, No. 181iii!
J is a diagram showing another embodiment in which a pilot signal of one frequency is intermittently recorded. Ili is a diagram showing an embodiment of the JP detection circuit of the 1*embodiment shown in FIG. 18. 7-IH delay line 8... first switch 54
... Pilot signal generation circuit 35 ... Selection circuit 5B ...; Parter S
9...First tank [al charge] 40...Second tank circuit 41...Differential amplifier 1 42...V iter circuit 44...Selection circuit Figure i Figure 9 Cool table Closing method Hatake I 1st θ Figure 1 I Figure 12 Chi 2゛ How to leave 1 Figure I4 B Figure 16 Figure 17

Claims (1)

[Claims] In the PAL system, the number of deviations αI of H from the @ adjacent video track
is (Rue α5)B [where B is the length equivalent to one horizontal period on the track, n=1.2...], but the chroma signal R-Y and -(R- Y) In a magnetic recording/reproducing device (VTR) equipped with a circuit for correcting the arrangement of components, there is a circuit for multiplexing a pilot signal on each video track during recording, and a pilot signal for detecting when the head jumps a video track during playback. A PAL signal reproduction device characterized by comprising a circuit for detecting signals.