JPH0440914B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording/reproducing apparatus for a color video signal, such as a PAL color video signal, in which the modulation format of a carrier color signal is different for each horizontal period.

In general, in devices that record and play back video signals in the PAL format, depending on the number of deviations in H (α _H ) of recording tracks recorded one track per field on a magnetic tape, special cases such as search and still playback may occur. When reproducing the image, the color synchronization section of the receiver is disturbed, resulting in inconveniences such as no color being added.

For example, as in the PAL 3 time recording system of the VHS system, α _H = (n - 0.5) H (where n = 1, 2, 3,
), H alignment can be achieved and the above-mentioned problems do not occur.

FIG. 1 shows a recording track pattern on a magnetic tape when α _H =1.5H. In Figure 1, 1, 2, 3,...625 represent line numbers,
A ₁ , A ₂ , A ₃ , . . . represent video tracks of channel A, and B ₁ , B ₂ , B _{3 ,} . . . represent video tracks of channel B. Further, in the carrier color signal in the PAL chroma signal, the phase of the RY component is inverted every horizontal period (hereinafter referred to as 1H).

In Fig. 1, the diagonal line is -(R
-Y) component is R-Y for lines without diagonal lines.
Indicates that the ingredients are recorded. In this case, R
The -Y component and the -(RY) component are arranged perpendicularly to the track extension direction, and during special playback such as search or still playback, the -Y component and -(RY) component are aligned perpendicularly to the track extension direction.
(RY) components are always reproduced alternately line by line. FIG. 2 shows a reproduced signal when the recorded track pattern of FIG. 1 is searched and reproduced. 2a is a playback signal from channel A, and 2b is a video signal from channel B, and as mentioned above, the RY component and -
(RY) components are played back alternately, and a normal playback screen can be obtained.

Next, α _H =nH (where n=1, 2, 3,...)
The case will be explained below. FIG. 3 shows a recording track pattern on a magnetic tape when α _H =1.0H. In this case, unlike the example in Figure 1,
The RY component and the (RY) component are alternately arranged perpendicular to the extension direction every two tracks. Therefore, during special playback such as search or still playback, the playback head plays back a track that has skipped over one track. A so-called track jump occurs, in which the R-Y component and the -R-Y component are interchanged, and the chroma signal becomes discontinuous. Fourth
The figure shows a reproduced signal when the recorded track pattern of FIG. 3 is searched and reproduced. As mentioned above, the chroma signal discontinuity occurs at the track jump point where the reproduced signal is at its minimum, causing problems such as color loss in the receiver.

Also, when α _H = nH as in the example in Figure 3,
H alignment cannot be achieved, and crosstalk components reproduced from adjacent video tracks become more noticeable on the screen, resulting in deterioration of image quality. This is particularly noticeable during searches and special playback of stills.

Therefore, in this case, H alignment can be achieved by shifting the mounting positions of the two rotary heads by 0.5H from the 180 degree positions. By doing the above, α _H =
(n±0.5)H. Figure 5 shows α _H = (1±0.5)H
This is the recording track pattern when Further, FIG. 6 shows the case where α _H =(2±0.5)H.

In the cases shown in FIGS. 5 and 6, as in the example shown in FIG. 3, color fading occurs due to the discontinuity of the chroma signal at the track jump point during special playback of searches, stills, etc.

As a means of solving the above-mentioned problems, there is a method of using a 1H delay line in the chroma signal reproducing circuit and switching the chroma signals before and after the 1H delay line at the track jump point. For example, if the R-Y component is reproduced again following the R-Y component at the track jump point, the chroma signals before and after the 1H delay line can be switched at this track jump point to either 1H or
It is replaced with the chroma signal after 1H, that is, the -(RY) component, and the discontinuity of the chroma signal is corrected.

However, the problem here is the means for detecting the track jump point.

Figure 7 shows a conventional technique for detecting a 90 degree phase step of a burst signal generated during a track jump as a track jump detection means.
An example of a PAL type reproduction chromatography signal processing circuit is shown. In Figure 7, 1 is the input terminal of the burst flag pulse P, and 2 is the carrier wave frequency during reproduction.
_L low frequency conversion chroma signal input terminal, 3 horizontal synchronization signal input terminal, 4 playback mode signal input terminal, 5 first converter, 6 comb filter, 7 1H delay line, 8 second 1 changeover switch,
9 is a second selector 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) 13
is an AFC circuit (automatic frequency circuit), 14 is an oscillation circuit, 15 is a first phase shifter, 16 is a second phase shifter,
17 is a third changeover switch, 18 is a burst gate circuit, 19 is a phase comparison circuit, 20 is an integration circuit,
21 is a voltage comparison circuit, 22 is a monomulti, 23 is a flip-flop circuit, 24 is a REF signal generator,
25 is an AND circuit, and 26 is a track jump pulse generation circuit (hereinafter referred to as JP generation circuit).

First, the circuit operation will be explained. Input terminal 2
The low frequency converted chroma signal from the first converter 5
The carrier frequency s is converted into a chroma signal of approximately 4.43 MHz, which passes through a comb filter 6 and is guided to a first switch 8 and a 1H delay line 7. first switch 8
The chroma signal on the input side and the output side of the 1H delay circuit 7 is switched, and is switched every time discontinuity of the chroma signal occurs during track jump, and the chroma signal with the discontinuity corrected is switched to the second chroma signal. switch 9
lead to.

The second switch 9 replaces only the burst signal from among the signals from the first switch 8 with the reference signal from the third switch 17 in response to the burst track pulse P from the input terminal 1. The reference signal from the third switch 17 has a phase difference of 135 with respect to the carrier wave of the reproduced chroma signal for each line.
This is a signal that switches between degrees/225 degrees, and is similar to the burst signal of the PAL system. The chroma signal with discontinuity corrected in this way is output to the output terminal 10.
The output signal is then guided to a mixer where it is mixed with a reproduced luminance signal.

Next, the track jump pulse (JP signal) generation circuit 26, which is surrounded by a broken line, will be explained.
The burst signal from the first switch 8 passes through the burst gate circuit 18 and is guided to the phase comparator circuit 19. Here, the phases of the burst signal and a similar reference signal are compared, and the burst signal generated when the R-Y component and the -(R-Y) component of the reproduced chroma signal are no longer arranged alternately line by line. The detected pulse is integrated by the integrator circuit 20, and the voltage comparison circuit 21 integrates the detected pulse.
The level is compared with the REF signal from the REF signal generation circuit 24. The output of this integrating circuit 20 is REF
The signal detected to have exceeded the signal level passes through the monomulti 22, one side returns to the integrating circuit 20 to discharge the integrated signal, and the other side is led to the AND circuit 25 through the flip-flop 23 and connected to the input terminal 4. AND with the playback mode signal from
, and the JP signal is guided to the first switch 8.

However, in the conventional example described above, effects such as missing burst signals caused by dropouts, etc., cause errors in track jump detection.
This falsifies the correction of the chroma signal discontinuity described above. Furthermore, in order to reduce malfunctions in this correction, it is necessary to switch the level of the REF signal of the REF signal generation circuit 24 in search, still, and slow special playback modes. Also, this
The level of the REF signal depends on the head track width, video track pitch, etc., making its setting difficult and circuitry complex. Furthermore, it becomes extremely difficult to ensure compatibility.

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 reliably detect a track jump point with a simple circuit.

In order to achieve the above object, in the present invention, a pilot signal recording circuit multiplexes a pilot signal around 100KHz onto each video track, and a playback pilot signal detection circuit performs special playback such as search and stills. At the same time, the playback head detects the position at which the video track jumps. Furthermore, during normal playback, the pilot signal can also be used to detect a control signal that causes the playback head to normally track the main track, thereby improving cost performance.

First, as an embodiment of the present invention, a case will be described in which four frequencies are used as pilot signals recorded on each video track.

Here, the four-frequency pilot signals are f ₁ and
Let f ₂ , f ₃ , and f ₄ be selected, and their respective frequencies are selected so that the following relationship holds.

f ₂ −f ₁ f ₄ −f ₃ k・f _H ……(1) f ₃ −f ₁ f ₄ −f ₂ m・f _H ……(2) k≠m ……(3) However, f _H is one horizontal period frequency, k and m are positive values. Further, the pilot signals to be recorded on the channel A track are selected as f ₁ and f ₄ , and the pilot signals to be recorded on the channel B track are selected as f ₂ and f ₃ .

As an example of a pilot signal that satisfies the above relational expression, let k = 1, m = 3, f ₁ = 6.5f _H , f ₂ =
There are 7.5f _H , f ₃ =9.5f _H , and f ₄ =10.5f _H . Also, as another example, k=1, m=3, f=6.88f _H ,
It is also possible to choose f ₂ =7.80f _H , f ₃ =9.75f _H , and f ₄ =10.64f _H .

FIG. 8 shows an embodiment of a circuit for recording the pilot signal on each video track. In FIG. 8, 27 is an input terminal for an FM-converted luminance signal, 28 is an input terminal for a low-frequency converted chroma signal, 29 is an input terminal for pulses synchronized with head switching, 30 is a first mixer, 31 is a second mixer;
32 is a recording amplifier, 33 is a recording head, 34 is a pilot signal generation circuit, and 35 is a selection circuit.
The luminance FM signal and the low frequency converted chroma signal are mixed in the first mixer 30 and guided to the second mixer 31. On the other hand, the pilot signals f ₁ to _{f 4} from the pilot signal generation circuit 34 are led to the selection circuit 35, and are selected from f ₁ → f ₂ by pulses synchronized with head switching.
→f ₄ →f ₃ are sequentially selected so as to make a complete circuit, and are led to the second mixer 31. However, in this case,
At the head of channel A, pilot signals f ₁ and f ₄
However, it is assumed that f ₂ and f ₃ are selected at the head of channel B. In the second mixer, the brightness FM above
The signal, low frequency chroma signal, and pilot signal are mixed and guided through a recording amplifier 32 to a head 33 and recorded on magnetic tape.

An example of the video track pattern of the pilot signal recorded in this manner is shown in FIG.
In FIG. 9, A ₁ , A ₂ , . . . represent video tracks of channel A, and B ₁ , B _{2 ,} . . . represent video tracks of channel B. The principle of detecting track jump points during 6x speed search playback will be explained with reference to FIG. Generally, in high-density recording/reproducing devices (VTRs) that do not have guard bands, an azimuth recording method is used to suppress crosstalk components from adjacent video tracks. In FIG. 9, reproduction heads A and B have the same azimuth as the heads that recorded the video tracks of channels A and B, and mainly reproduce the signals recorded on the video tracks of channels A and B, respectively. Furthermore, the broken lines indicate the tracking patterns of each head.

FIG. 10 shows an embodiment of the track jump point detection circuit in the above embodiment. 10th
In the figure, 36 is an input terminal for reproduction pilot signals f ₁ to _{f 4} , 37 is an input terminal for pulses synchronized with head switching, 38 is a converter, 39 is a first tank circuit, 40 is a second tank circuit, 41 4 is a differential amplifier, 42 is a limiter circuit, 43 is a JP signal output terminal, and 44 is a selection circuit.

FIG. 11 is an explanatory diagram of the operation of the embodiment shown in FIG. 10. In FIG. 11, 11a is the FM envelope waveform of the head reproduction signal during search reproduction shown in FIG. A ₁ , A ₂ , A ₃ , and B ₄ represent respective video tracks. The arrow 11b is a track jump point, which coincides with the point where the envelope waveform 11a is at its minimum. In this case, the pilot signals f ₁ to _{f 4} are generally selected to be around 100 KHz, which is lower than the frequency of the low frequency converted chroma signal, and the azimuth effect of the head cannot be expected, so the level of the reproduced pilot signal from the same head is The frequency is approximately constant, and the frequency at which the reproduced pilot signal has a maximum level is 11c. The reproduced pilot signal as shown in 11c is led from the input terminal 36 to the converter 38. Input terminals 37 to 11
A pulse synchronized with _the head switching as _shown in FIG. Here, as shown in 11d, the carrier signal is the pilot signal _f2 or _f3 recorded on channel track B when the head of channel A is reproduced, and the pilot signal recorded on channel track A when the head of channel B is reproduced. Select _f1 or _f4 . In this case, the difference frequency between the reproduced pilot signal and the carrier signal in the output of the converter 38 is 11e. If the tank frequencies of the first tank circuit 39 and the second tank circuit 40 in FIG. 10 are selected to be k·f _H and m·f _H , respectively, the output of the differential amplifier 41 becomes 11f. This differential amplifier 41
In order to detect the zero cross point of the output 11f, the signal is passed through a limiter 42, and a JP signal such as 11g is obtained at the output terminal 43.

In the example of FIG. 9, the order in which the pilot signals are recorded is selected in a cycle of f ₁ → f ₂ → f ₄ → f _3. In this case, during special playback, the selection circuit 44 of FIG. Therefore, by selecting the order in which the pilot signals f ₁ to _{f 4} are switched for each field in a cycle of f ₂ →f ₁ →f ₃ →f ₄ , the JP signal can be detected regardless of the search speed.

In addition, in the example of FIG. 9, the order in which the pilot signals are recorded may be selected as follows: f ₁ → f ₃ → f ₄ → f _2. In this case, during special playback, the pilot signal is recorded by the selection circuit 44. The JP signal can be detected by selecting the signal switching order in a cycle of f ₂ → f ₄ → f ₃ → f ₄ .

The above has explained the case during search playback. Similarly, it will be explained that the track jump point can be detected according to the present invention even during slow playback.

FIG. 12 shows an example of the tracking pattern of the playback head during 1/2 slow playback. The method of recording the pilot signals _f1 to _f4 is the same as that shown in FIG. 1st
In FIG. 2, the broken line shows the tracking pattern of the reproducing head A, and the dashed line shows the tracking pattern of the reproducing head B. In addition, playback heads A and B are
Channel tracks A and B are mainly played.

By using the embodiment shown in FIG. 10 as the JP signal detection circuit as in the case of search reproduction, JP signal detection becomes possible. FIG. 13 is an explanatory diagram of this JP signal detection operation. In Figure 13, 1
3a is the FM envelope waveform during playback, and a track jump point 13b is located at the minimum point of the FM envelope waveform, similar to the time of search playback. 13c represents the maximum level signal component of the reproduced pilot signal, 13d represents the carrier signal from the selection circuit 44, 13e represents the difference frequency of the converter 38, and as the output signal of the differential amplifier 41, the signal as shown in 13 is is obtained. Therefore, limiter 42
A JP signal can be obtained at the output of 13d.

Here, the carrier signal 13 from the selection circuit 34
The frequency of d is the same as that at the time of search playback, and f ₂ or f ₃ is used for playback head A, and
Select f ₁ or f ₄ when . Furthermore, the switching order of the carrier signal 13d for each field depends on the recording order of the pilot signals, and is the same as that at the time of search playback. As a result, the JP signal can be detected even when the tape feed speed is different or when playing in slow motion.

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

As described above, by using one embodiment of the present invention, it is possible to detect a track jump point in special playback in any mode without any control for each mode. JP detected in this way
For example, the first switch 8 in FIG.
By using this as a control signal, the line sequentiality of the chroma signal is kept stable and color fading is corrected.

In one embodiment described above, the pilot signals f ₁ -f ₄ are recorded over the entire video track. However, in the present invention, it is not necessary to record the pilot signals f ₁ -f ₄ over the entire video track; for example, the pilot signals f ₁ -f ₄ are recorded during horizontal synchronization or during the front bowch period. The pilot signals f ₁ to _{f 4} may be recorded intermittently, and the pilot signals f ₁ to f ₄ may be used which are intermittently reproduced during reproduction.

In FIG. 14, the pilot signal f ₁ ~
This is an example of a track jump point detection circuit when _f4 is intermittently recorded. The difference from the embodiment 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 output level during the detection period other than the detection period. By doing so, the track jump point can be detected accurately as in the embodiment described above.

Next, in the case where the pilot signal is intermittently recorded on the video track in the present invention, an embodiment in which the pilot signal has one frequency _f0 will be described as the most notable example.

FIG. 15 shows an example of a tape pattern in which a one-frequency pilot signal f ₀ is intermittently recorded. 1st
In FIG. 5, A ₁ , A ₂ , and A ₃ represent video tracks of channel A, and B ₁ , B ₂ , and B ₃ represent video tracks of channel B. Moreover, the thick line is the pilot signal _f0 recorded intermittently every 4H in one track. The pattern of the recorded pilot signal is controlled in advance during recording so that it becomes as shown in FIG.

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 mixer; 52 is an inverter; 53 is a switch circuit; 54 is a limiter circuit;
5 is a flip-flop, and 56 is a JP signal output terminal.

The principle by which a track jump point can be detected will be explained using an embodiment shown in FIG. Assume that the playback head of channel A is currently playing back video track _A2 as the main track during the search. In this case, the playback pilot signal is intermittently gated by the gate circuit and the video track is
After 1H of the reproduction pilot signal from video track B ₂ , the reproduction pilot signal from video track B ₂ is gated, and its output is held in P ₁ of the hold circuit 49. After the next 1H, the reproduction pilot signal from video track _B1 is gated, and its output is held in _P2 of the hold circuit 49. Similarly, the level of the playback pilot signal from video track _A1 or _A3 is held at _P3 . The mixer 51 calculates the level of P ₁ -P ₂ +P ₃ for each hold signal, and passes it through the switch 53 to the limiter circuit 5.
Guided by 4. FIG. 17 shows the level calculation output of P ₁ -P ₂ +P ₃ and the amount of deviation of the reproduction head from the main track. In FIG. 17, 17a shows the case where the playback head is located at the center of video track _A2 , and 17b shows the case where the playback head is located at the center of video track _B2 , and the interval between 17a and 17b is one track pitch. corresponds to Further, the solid line indicates the time when the channel A playback head is used, and the broken line shows the time when the channel B playback head is used. By passing the above level calculation output through a limiter 54 and leading it to a flip-flop 55 which is driven by a falling edge, an output terminal 56 outputs a JP signal which detects the point where the playback head is located on the video track _B2 , that is, the track jump point. You can get a good signal. This JP signal is fed back to the selection signal generation circuit 50, and the hold circuit 49
Change the track timing. Further, during the reproduction head of channel B, the output of the mixer 51 is guided to the limiter 50 through the inverter 52.

As described above, the track jump point can be accurately detected even when using a single frequency pilot signal.

FIG. 18 shows a tape pattern diagram of another embodiment in which a one-frequency pilot signal f ₀ is intermittently recorded. In FIG. 15, the pilot signal is recorded intermittently every 2H on each track.
The pilot signals in the bold and diagonal lines have different phases, respectively.
It's 180 degrees different. Furthermore, 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 recorded tape pattern shown in FIG. 18 is reproduced. In Figure 19, 57
58 is an input terminal for a pulse synchronized with head switching, 59 is an input terminal for a gate control signal of a 2H cycle pilot signal, 60 is an inverter circuit, 61 is a switch circuit, and 62 is a 2H delay line. , 63 is an adder, 64 is a subtracter, 65 is an LPF, 66 is a first gate circuit,
67 is a second gate circuit, 68 is a first hold circuit, 69 is a second hold circuit, 70 is a differential amplifier, 71 is a limiter circuit, 72 is a JP signal output terminal, and 73 is a 1H delay circuit. .

The principle by which a track jump point can be detected according to a nineteenth embodiment will be explained. Assume that the playback head of channel A is currently playing back video track _A2 as the main track during the search. In this case, the reproduced pilot signal is passed from the input terminal 57 through the switch 61 to the 2H delay line 6.
2, an adder 63, and a subtracter 64. Here, the adder 63
The output of the subtracter 64 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. The output of the adder 63 is led to the first and second gate circuits 66 and 67 through the LPF 65, where the input terminal 59
gated by a gate signal of 2H intervals from , and a gate signal delayed by 1H by a 1H delay line 73,
They are led to first and second hold circuits 68 and 69, respectively. Therefore, the first hold circuit 68 receives the reproduction pilot signal from the video track _A2 .
The second hold circuit 69 has a video track _A3 .
The reproduced pilot signals from the two are held at their respective peaks. By leading these two peak hold outputs to the differential amplifier 70, the differential amplifier output has positive polarity when the playback head is on the video track _A2 side, and negative polarity when the playback head is on the video track _A3 side. A signal is obtained. Therefore, by passing this output through the limiter circuit 71, a signal similar to 11g in FIG. 11 is provided at the output terminal 72.
You can get JP signal. When the playback head is channel B, the JP signal can be similarly detected by introducing the playback pilot signal through the inverter circuit 60 to the above-mentioned 2H comb filter.

In the present invention, as an example, the pilot signal is
I explained the case of frequency and the case of one frequency.
Of course, three-frequency and two-frequency cases are also possible.

Further, here, only the case where the JP signal indicating the track jump point detected by the present invention is used to normally connect the chroma signal during special playback such as search or still will be explained, but for example,
Since the position of the JP signal matches the minimum point of the envelope waveform of the reproduced FM signal, it can be used as a control signal for noise suppression during still shooting. It can also be used as a dropout detection signal during a search. Furthermore, if H alignment cannot be achieved and skew occurs during search or still special playback, it can be used as a control signal for skew compensation.

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

According to the present invention, in a PAL color video signal recording/playback device, a recording method other than α _H ≠ (n-0.5)H (where n = 1, 2,...), for example, α _H = nH or α _H = (n-0.5)H and (n+0.5)
By switching between H and H for each track, it is possible to easily detect the track jump point of the playback head during special playback such as search and still, and it is possible to easily detect the track jump point of the playback head during special playback such as search and _still . It is not necessary to switch to , it is possible to ensure good compatibility and normal connection of chroma signals, and problems such as no coloring are solved.

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

[Brief explanation of drawings]

FIG. 1 is a diagram showing a recording tape track pattern when α _H =1.5H in the PAL system, and FIG. 2 is a diagram showing an example of a reproduced signal when the recording tape track pattern of FIG. 1 is reproduced. Figure 3 shows
FIG. 4 is a diagram showing a recording tape track pattern when α _H =1H. FIG. 4 is a diagram showing an example of a reproduced signal when the recording tape track pattern of FIG. 3 is searched and reproduced. _FIG . Figure 6 shows the recording tape track pattern for 0.5/1.5H.
FIG. 7 is a diagram showing a recording tape track pattern in the case of α _H = 1.5/2.5H. FIG. The figure shows an embodiment of the pilot signal recording circuit, and FIG. 9 shows the pilot signal recording tape track pattern,
Figure 10 shows an example of a JP detection circuit using a pilot signal. Figure 11 shows the operation of the JP detection circuit during 6x search playback. figure to do,
FIG. 12 is a diagram showing head tracking during 1/2 slow playback, FIG. 13 is a diagram explaining the operation of the JP detection circuit during 1/2 slow playback, and FIG. 14 is a diagram showing head tracking during 1/2 slow playback.
When recording a 4-frequency pilot signal intermittently
FIG. 15 is a diagram showing an example of the JP detection circuit.
FIG. 16 is a diagram showing an embodiment of the JP detection circuit of the embodiment shown in FIG. 15, and FIG.
A diagram explaining the circuit operation in FIG. 16 and FIG. 18 are as follows.
FIG. 19 is a diagram showing another embodiment in which a one-frequency pilot signal is intermittently recorded. FIG. 19 is a diagram showing an embodiment of the JP detection circuit of the embodiment shown in FIG. 18. 7...1H delay line, 8...1st switch, 3
4... Pilot signal generation circuit, 35... Selection circuit, 38... Converter, 39... First tank circuit, 40... Second tank circuit, 41... Differential amplifier, 42... Limiter circuit, 44...Selection circuit.

Claims (1)

[Claims] 1. A magnetic tape in which a pilot signal whose frequency changes for each field in a predetermined order is frequency-multiplexed with a PAL color signal and recorded as a diagonal track is played back across a plurality of diagonal tracks. a reproduction head that separates a reproduction chrominance signal and a reproduction pilot signal from the reproduction signal reproduced by the reproduction head, and a delay element, the reproduction head having a time difference of one horizontal period from the reproduction chrominance signal; Signal generating means for generating a reproduced color signal and a non-delayed reproduced color signal; Track jump detecting means for detecting the occurrence of a track jump from the reproduced pilot signal and generating a detection signal; The selection means alternately selects the reproduced color signal and the non-delayed reproduced color signal based on the detection signal from the track jump detection means, and the output of the selection means is a reproduced color signal in which the phase of the burst signal is continuously inverted. characterized by obtaining
PAL signal reproducing device.