JPH06295496A - Recording and reproducing device for information signal - Google Patents

Abstract

PURPOSE:To eliminate a fixed head and increase the S/N of a signal by recording pilot signals which differ in frequency from each other at a 1st and a 2nd part occupying part of a track and then recording a blanking signal in the gap between both the parts. CONSTITUTION:A selecting circuit 19 selects a pilot signal f0 from a pilot generating circuit 25 for a period of pulse width tau1 (=tau) with a pulse D from a delay multivibrator circuit 11, a pilot signal (f) for a period of pulse width tau3(=2pi) with a pulse J from a two phase dividing circuit 18, and a pilot signal f2 for a period from width tau3 with a pulse K from the circuit 18. Further, the circuit 19 selects the blanking signal fB from a blanking signal generating circuit 26 for periods of respective pulse widths with pulses C, E and G from delay multivibrator circuits 10, 12, and 14. Those signals are rearranged in time-series order and pulses are sent out of an output L in the order of the signals f0 and f1 in a period of H or in the order of the signals f0 and f2 for a period of L while having the signal fb added before and behind them.

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a video signal and an audio signal.
Which information signal is recorded or reproduced on tape with a rotary head
In particular, a tracker in a rotary head type recording / reproducing apparatus
The present invention relates to a recording / reproducing device for an information signal suitable for controlling a video signal. 2. Description of the Related Art Conventional helical scan VTRs and the like
In a rotary head type magnetic recording / reproducing device,
Correctly scan the recorded and formed track with the rotary head.
A fixed head (control
Control head provided at the end of the magnetic tape.
Based on the control signal recorded on the
The rotational phase of the rotary head or the running position of the magnetic tape.
Methods of controlling the phase are commonly used. [0003] However, this controller
In the conventional method using a control signal, the control signal is recorded.
Repeat the relative positional relationship between the fixed head and the rotary head.
Must be constant on the device and if it is different
Will not track correctly, and compatible playback will
There is a problem that the reliability of the device is impaired due to difficulty
It was As a method for improving this, for example, the literature
(Japanese Patent Publication No. 56-20621)
Method using the ilot signal, reference (JP-A-54-350)
A method using a two-frequency pilot signal described in Japanese Patent No. 7)
Method, 3 described in the literature (Japanese Patent Publication No. 56-20622)
Method using frequency pilot signal
-116120), the four-frequency pilot signal
The method of using the No. is known. However, in these known examples,
These are also main signals such as video signals for which pilot signals should be recorded
Since it is recorded by frequency multiplexing on
The essence of a signal mixing with its main signal to generate spurs
Problems and pilots to mitigate their impact
The recording level of the signal must be sufficiently lower than that of the main signal.
And thus the S / N of the reproduced pilot signal is insufficient.
Therefore, stable tracking control can be performed.
There were problems such as difficulty. Further, in some of the above-mentioned publicly known examples, the operation source thereof is
In theory, the horizontal scanning line unit of the video signal which is the main signal is set to 1H.
The vertical direction of the track and the adjacent track.
The so-called H line-up that aligns in horizontal scanning line units between
Adjacent track at the end of the track
Specific restrictions, such as setting the amount of misalignment between racks to 1.5 H
Conditions are required, and in realizing a magnetic recording / reproducing device
There was a big constraint problem. SUMMARY OF THE INVENTION The present invention provides a rotary head.
Information signals of parallel diagonal tracks on magnetic tape
At least a part of the area separated from the area for recording
Occupy a third gap between the first and second parts
The first part is provided with a minute for detecting its location.
1 pilot signal is recorded, and the first part is recorded in the second part.
Tracking error amount of frequency different from the pilot signal of
Recording a second pilot signal for detection, the third gap
In part, these pilot signals have different frequencies.
The blanking signal is recorded, and
In relation to the amount of misalignment between adjacent tracks of
Minutes the first of each of the two tracks adjacent to it
The part and the track overlap each other when viewed in the direction perpendicular to the longitudinal direction.
Position so that the second part touches it next to it
Second part of each of the two tracks and the track length
Arranged so that they do not overlap each other when viewed in the direction perpendicular to the hand direction
Let According to the above recording method, the magnetic field on which the information signal is recorded is recorded.
When playing back the tape, it is recorded in the first section above.
It depends on the timing when the pilot signal is reproduced.
The second part of each of the two tracks adjacent to
If not, at the timing corresponding to part of the position
Between the pilot signals recorded in the second part of
Detected level difference, and based on the detected output,
By controlling the relative position of the rotary head and the magnetic tape
Therefore, tracking control is performed. Tracking control is performed by the above recording method.
The pilot signal used for
The same rotary head records on the same track,
Fixed head that was dedicated to racking control (control
Control head and control track.
Wear. In addition, an information signal recording area is formed on the track.
Since the recording area of the pilot signal is completely separated,
No interference between the information signal and the pilot signal
Therefore, the recording level of the information signal and pilot signal
It is possible to increase the
S / N of the information signal and pilot signal to be reproduced for
It is possible to raise the level sufficiently, high-quality information reproduction and stable
Racking control is performed. Furthermore, the pilot signal is recorded.
The first and second parts are adjacent to each other at the end of the track.
Since it is arranged in relation to the amount of misalignment between tracks,
The recording area of the
There are no restrictions such as H alignment conditions between adjacent tracks.
It will be important. The present invention will be described in detail below with reference to examples.
It FIG. 1 shows a video signal recorded as an information signal.
Rotating head type helical scan type video tape recorder
Magnetic recording / reproducing apparatus when the present invention is applied to a VTR (VTR).
FIG. 2 is a diagram showing an example of an arrangement, and FIG.
Waveform diagram of each part, Fig. 3 shows tracks formed by recording
FIG. 4 is a diagram showing a pattern of FIG. 4, and FIG.
FIG. 5 is a diagram showing an embodiment of a control device, and FIG. 5 is for explaining its operation.
FIG. 3 is a waveform chart of each part of FIG. In FIG. 1, the magnetic tape 1 is a capster.
And the capstan motor 20 is driven.
Controls rotation at a constant speed by the capstan servo circuit 21
To be done. The magnetic heads 4a and 4b have different azimuth angles.
And mounted on disk 2 at an angle of 180 degrees to each other
Is rotated and rotated with the disc 2 by the disc motor 6.
To be done. Wrap tape 1 on disk 2 more than 180 degrees
The magnetic heads 4a and 4b are attached to the tape 1
As shown in FIG.
The so-called overlap part shown in Q1 and Q2 is formed.
It The disk 2 has two magnets 3a, 3b
It is attached at an angle of 180 degrees to the
Detected by the head 7 and synchronized with the rotation of the magnetic heads 4a, 4b
The pulse A (a in FIG. 2) is obtained from the tack head 7.
The pulse A from the tack head 7 is sent to the phase adjusting circuit 8.
As a result, the magnetic heads 4a and 4b and the tape 1 are in a predetermined relative position.
After the phase is adjusted so that it has a positional relationship, its output is
It is supplied to the loose forming circuit 9. Is this pulse forming circuit 9
Et al., A duty unit synchronized with the rotation of the magnetic heads 4a, 4b.
A pulse B (b in FIG. 2) having a ratio of 50% is output. Reference numeral 10 is a delay multi-circuit, which forms a pulse.
The rise and fall of pulse B from circuit 9
A pulse of width τ 0 for a given time, triggered on both edges
C (c in FIG. 2) is output. The value of τ0 is arbitrary
However, the arrangement between adjacent tracks at the track edge described later
For time τ corresponding to the amount of deviation, here τ 0 = τ
Is set. In the delay multi circuit 11,
Triggered by the falling edge of pulse C from circuit 10,
A pulse D (d in FIG. 2) having a width of a predetermined time τ1 is output.
It Here, the value of τ1 is equal to the value of τ above (τ1 = τ)
Is determined to be. In addition, the delay multi-circuit 12
Trigger on the falling edge of pulse D from this circuit 11.
Then, a pulse E (e in FIG. 2) having a width of τ2 is output for a predetermined time.
I will be forced. The value of τ2 is set so that τ2 = 2τ
To be Further, in the delay multi-circuit 13, the circuit 12
Triggered by the falling edge of the pulse E from the
A pulse F (f in FIG. 2) having a width of is output. Where τ3
The value of is determined such that τ3 = 2τ. Also delay
Fall of pulse F from circuit 13 in multi-circuit 14
A pulse G (Fig.
2 g) is output. The value of τ4 is arbitrary,
Here, it is determined that τ 4 = τ. Moreover, late
In the extended multi-circuit 15, the rise of the pulse G from the circuit 14
Triggered by falling, pulse H with width of τ5
(H in FIG. 2) is output. Reference numeral 16 is a latch circuit, which is a circuit from the circuit 9.
Ruth B latches at the falling edge of pulse H from circuit 15.
Therefore, the pulse B from the circuit 9 is delayed by the time (τ 0 +
Pulse delayed by τ1 + τ2 + τ3 + τ4 + τ5)
I (i in FIG. 2) is output from the circuit 16. This circuit 1
The pulse I from 6 is supplied to one of the disk servo circuits 17.
And the frame circumference of the video signal to be recorded to others.
Reference signal of the disk servo system at the time of recording the vertical synchronization signal
Signal is supplied from the terminal 100. This disc server
In the circuit 17, the pulse I from the circuit 16 and the terminal 100
The reference signals from are compared in phase and according to the phase difference between them.
The phase error signal is output from the circuit 17 and the disc motor
6 is supplied. Therefore, the pulse I has the same phase as the reference signal.
Servo-controlled magnetically, magnetic heads 4a, 4b
Is rotated at a rotational speed equal to the frame frequency. Reference numeral 30 denotes a video signal processing circuit, which is a terminal 20.
The video signal to be recorded is input from 0a, and the circuit 30
After being processed appropriately, the
To the tracks A and B of FIG. 3 by the pads 4a and 4b, respectively.
It is recorded closely without a guard band. Next, 18 is a two-phase division circuit,
The pulse F from 3 has two phases by the pulse B from the circuit 9.
The pulse J is divided and the pulse J (in FIG.
j) is a pulse K (in FIG. 2) in a period in which the pulse B is “L”.
k) is output. 25 is a pilot generation circuit,
Generates three pilot signals f0, f1 and f2. This
The frequency of each pilot signal is the same as the magnetic heads 4a, 4
The azimuth loss is relatively small with respect to the azimuth angle of b.
And pilot signals f1 and f2 are
The frequency of the pilot signal f0
The number is set arbitrarily. 26 is a blanking signal generation time
And the pilot signals f0, f1 and f2 are
Generate blanking signals fB with different frequencies, where
Is an example of the azimuth angle of the magnetic heads 4a and 4b.
And give it at a frequency where the azimuth loss is sufficiently large.
To be Reference numeral 19 is a selection circuit, which is a circuit from the circuit 11.
Russ D times the pulse width τ 1 (= τ)
The pilot signal f0 from path 25 is selected and the circuit
The pulse width τ 3 (= 2
τ), the pilot signal f1 is selected and
The pulse width τ3 (= 2
The pilot signal f2 is selected only during the period (.tau.). Furthermore
In the selection circuit 19, the pulse C from the circuit 10
Pulse E from path 12 and pulse G from circuit 14
Therefore, the blanking from the circuit 26 is performed only during the period of each pulse width.
Signal fB is selected. Each of these selected pilots
The blanking signal and blanking signal are arranged in chronological order,
From the output L (1 in FIG. 2) of the pulse B during the "H" period.
Is in the order of pilot signals f0 and f1 and pulse B is "L"
During the period, pilot signals f0 and f2 are in this order, and
Blanking signal fB is inserted before and after each pilot signal.
It is output in bursts in the inserted form. This circuit 19
The output signal L from the same is sent to the track of FIG.
It is recorded in the area indicated by P in the overlap portion Q1 of A and B.
It Next, as shown in FIG.
The amount of misalignment between adjacent tracks (τ in the figure) is
Set according to the running speed and the rotation speed of the magnetic heads 4a and 4b.
Therefore, it is given by τ as the amount of time the magnetic head scans.
It On the other hand, as described in FIG. 2, the pilot signal f0
Is the first part of each track (the part indicated by f0 in FIG. 3)
Is recorded for a time equal to the above misalignment amount τ,
The lot signal f1 or f2 is the second part of each track.
Pilot to the minute (portion indicated by f1 or f2 in Fig. 3)
When the signal is equal to twice the misalignment amount following the signal f0
After a period of 2τ, it is recorded for a time of 2τ. For this reason,
As shown in FIG. 3, the pyro recorded in the second part is recorded.
The recording start point (S2) of the input signal f1 or f2 is
The second part of each of the two tracks next to it
Of the scanning start edge when viewed in the direction perpendicular to the track longitudinal direction
Signal f1 recorded in the second part closer to
Or it may be the same as the recording end point of f2 (point indicated by E2 in FIG. 3).
It is arranged to match. As is clear from the pattern of FIG. 3,
The recording position of pilot signals f1 and f2 is the longitudinal direction of the track.
There is no overlap between adjacent tracks in the direction orthogonal to the direction.
Even pilot signal f1 comrades or pilots
Signal f2 will not overlap between adjacent tracks,
In addition, the pilot signal f0 also overlaps between adjacent tracks.
There is no such thing. The magnetic head in the disk 2 is
Installation error between 4a and 4b, or the above circuits 9, 1
Due to the adjustment error of 0, 11, 12, 13 and the like, each of the above
If the recording position of the pilot signal is shifted between tracks,
However, there is no problem in the operation of the present invention, and it is within the scope of the present invention.
included. Specifically, for example, the above pulse forming circuit
The duty ratio of the output pulse B from 9 is the above set value 50.
If it is adjusted to be slightly smaller than%, for example,
Is a pulse of the output pulse D from the delay multi circuit 11
The width deviates from the set value τ and is adjusted a little larger, for example.
The first part of each track between adjacent tracks
Partially overlaps when viewed in the direction perpendicular to the rack longitudinal direction, or
Contrary to the above, is the output power from the pulse forming circuit 9.
Adjust the duty ratio of loose B to a value greater than 50%.
Output from the delay multi-circuit 11
The pulse width of force pulse D was adjusted to be smaller than the set value τ
The first part of each track between adjacent tracks
There are no overlapping parts when viewed in the direction perpendicular to the rack longitudinal direction.
In any of these cases, the work of the present invention
It does not cause any problems in use and is included in the scope of the present invention. In addition,
In this case, considering the adjustment error of each circuit, the delay
Set the delay time setting value of the delay multi-circuit 11
If it is smaller than τ including it, it will be
View the first part of each in the direction perpendicular to the track longitudinal direction.
Can be placed so that they do not overlap each other
Needless to say. Similarly, the output from the delay multi-circuit 13 is
For example, the pulse width of force pulse F deviates from the set value 2τ above.
If it is adjusted a little bit, it will be
The second part of each is perpendicular to the longitudinal direction of the track.
, It partially overlaps, or contrary to the above, the set value 2τ
If it is adjusted smaller, it will be
The second part of each is in the direction perpendicular to the longitudinal direction of the track.
The overlapping part will not occur, but in any of these cases
Even in the above, no problem occurs in the operation of the present invention.
Included in the category. Even in this case, the adjustment of each circuit above
The delay time of the delay multi-circuit 13 considering the adjustment error
The setting value of is smaller than 2τ including the adjustment error.
If it is, the second part of each track will be
So that they do not overlap each other when viewed in the direction perpendicular to the longitudinal direction.
It goes without saying that they can be arranged in. FIG. 4 shows reproduction using the above pilot signal.
It is a diagram showing an embodiment of a tracking control device at the time,
The operation will be described with reference to the waveform chart of FIG. The servo control system during reproduction is as shown in FIG.
Most of the servo control system can be used in common when recording
In life, circuits 18, 19, 26 are unused
That is, the terminal 100 has a substitute for the vertical synchronizing signal of the frame period.
Instead, a predetermined reference signal of frame frequency must be input.
And a track from the tracking control device of FIG.
The king error signal is input to terminal 22, which causes
The capstan motor 2 via the pushan servo circuit 21.
0 is controlled, and the magnetic field in the video signal processing circuit 30 is controlled.
Reproduced from the magnetic tape 1 by the magnetic heads 4a and 4b.
The video signal and the pilot signal are appropriately processed and the terminal 200 is processed.
The reproduced video signal is shown in b and the reproduced pilot signal is shown in terminal 200c.
The only difference is that each issue is output
Is the same. Therefore, regarding the operation of FIG.
A part of FIG. In FIG. 1, the terminal 100 is played during playback.
Since the reference signal of the frame frequency is input,
Similarly, the pulse I from the circuit 16 is phase-locked to the reference signal.
The servo control is performed so that the magnetic heads 4a and 4b are recorded.
It is rotated at the same rotation speed as the same frame frequency as when recording.
It The magnetic heads 4a and 4b are used to alternately reproduce the tape 1.
The generated signal is sufficiently amplified by the circuit 30 and then imaged.
The signal and pilot signal are separated and reproduced at terminal 200c
The pilot signal is output. In FIG. 4, reference numeral 25 is a pilot generation circuit.
And can be shared with that of FIG.
is there. 37 is a pilot selection circuit, one of which is
Pilot signals f1 and f from the pilot generation circuit 25
2 is input, and the other one is the pulse forming circuit 9 of FIG.
These pulses B are input via the terminal 70. This pie
In the lot selection circuit 37, the magnetic head 4a moves on the tape.
In the scanning period, in which the pulse B is "H", that is,
This is the case when the pilot signal f1 is selected during recording.
The pilot signal f1 is selected and the magnetic head
Pulse B is a period during which scan 4b scans the tape.
L "period, that is, pilot f2 is selected during recording.
The pilot signal f2 is also selected during the selected period.
In any of these, at least the pyro shown in FIG.
The pilot signals f1 and f2 in the scanning period of the dot area P.
Are selected and output, and the pilot signal is
No output. The output from this circuit 37 is the local pie.
It is supplied to one of the frequency conversion circuits 31 as a lot signal.
It On the other side of the frequency conversion circuit 31, the terminal 200c of FIG.
The regenerated pilot signal from the
It With this frequency conversion circuit 31, the playback pattern from the terminal 60 is
The ilot signal is the local pilot signal from the circuit 37.
Signal is converted into frequency, and the difference frequency component of both is converted into the circuit 3
It is output from 1. In FIG. 3, the same as when recording by the head is performed.
When scanning the same track, for example, the magnetic head 4b
Run on track B1 recorded with ilot signals f0 and f2
When examined (The waveforms of each part in Fig. 4 at this time are shown in Fig. 5 (i).
Show. ), In the pilot area P, the main track B1
From which the pilot signals f0 and f2 are reproduced. Also,
Pilot signal f from both adjacent tracks A1 and A2
0 and f1 are detected as crosstalk. These two neighbors
Crosstalk from the contact track can be seen from the pattern in Fig. 3.
Obviously, the detected timings are different and
Since they are detected with a time lag of 2τ,
Do not overlap. On the other hand, as described above, the magnetic head 4b runs.
During the inspection period, the local pilot signal f2 is output from the circuit 37.
Output from the above main track and both adjacent tracks
The reproduced pilot signal of the
Since the frequency is converted by the ilot signal f2, the circuit 3
From 1, the difference frequency component is the component of f0 to f2
And the components f1 to f2 are output. Of these two ingredients
Of which, only the components of f1 to f2 are extracted by the filter 32
The output is subjected to envelope detection by the detection circuit 33.
Regarding the pilot signal f2 of the main track B1,
The frequency difference from the local pilot signal f2 becomes zero.
Therefore, it is not detected by the detection circuit 33. This detection time
From path 33, the tracks from both adjacent tracks A1 and A2
Only the output based on the ilot signal f1 is x in FIG.
As shown in y, they are detected for a period of 2τ with a time shift of 2τ.
Be done. The output from the detection circuit 33 is used for both adjacent tracks.
Output level x including only the crosstalk component from
And y correspond to the tracking error amount, and the main track
The center of gravity of scanning with respect to B1 is on the adjacent track A1 side.
In case of deviation to, the detection level x during the first 2τ period
It increases, the detection level y in the next 2τ period decreases, and conversely
When the center of gravity of scanning shifts to the other adjacent track A2 side
Is the opposite of the above relationship. Therefore these
By comparing the detection levels x and y of both,
It is possible to detect the king error amount and the polarity of the deviation.
You can The output from this circuit 33 is the sample hole.
Power supply circuit 34 and 35. Next, 38 is a reproduction pilot from the terminal 60.
To extract pilot signal f0 from the control signal
The output from the filter 38 is the detection circuit 39
The envelope is detected at. From this detection circuit 39, as shown in FIG.
As shown in a), the pilot signal from the main truck B1
Output z based on signal f0 and both adjacent tracks A1 and A
The outputs u and v based on the pilot signal f0 from 2 are
Each is detected for a period of τ. From this detection circuit 39
The output is pulsed by the pulse shaping circuit 40 at an appropriate threshold.
Based on the pilot signal f0 of the main track
A pulse (c in FIG. 5) related to the output z is output. Reference numeral 41 denotes a delay circle having a delay time of 6τ or more.
Circuit, and is activated by the rising edge of the pulse from the circuit 40.
You will be rigged. The delay time is set to 6τ or more.
For example, regarding reproduction of the pilot signal f1 or f2,
The pilot signal f0 may be erroneously detected consecutively.
However, it is inhibited and does not malfunction.
In other words, the pilot signal f0
The same frequency as the input signal f1 or f2
In general, any frequency can be selected. The output pulse from this circuit 41 (see FIG. 5)
d) is supplied to the sampling pulse generation circuit 42
Two sampling pulses SP1 and SP2 are generated.
Be done. First sampling pulse SP1 (e in FIG. 5)
Has a pulse width of 2τ or less,
Delayed by 2τ from the rising edge of the pulse from circuit 41
It is generated in the phase. Also, the second sampling pulse
SP2 (f in FIG. 5) is the first sampling pulse
Is delayed by approximately 2τ. This first sample
Pulse SP1 is a sampling pulse of the circuit 34
Circuit 34 and therefore from circuit 34,
Error voltage based on tracking error from rack (A1)
Pressure is output. Also, the second sampling pulse SP
2 is supplied as the sampling pulse of the circuit 35,
Therefore, from the circuit 35, the other adjacent track (A2
Error voltage based on the tracking error from
Be done. The error voltage from these circuits 34 and 35 is
The output is tracked by the pressure comparison circuit 36.
As the error signal, the capstan sensor of FIG.
It is supplied to the terminal 22 of the servo circuit 21.
The stun motor 20 is negatively feedback controlled. The above operation is performed on the main track B1.
Continue to the next main track A2 with the same azimuth angle
The same applies when the head 4a scans. In this case,
Selects the local pilot signal f1 from the circuit 37.
Everything is the same except that the points are different
The same as the above. As a result of the above operation, whether the above-mentioned adjacent tracks are
The crosstalk amounts of these pilot signals are equal to each other.
To scan the center of the main track
The tape speed is controlled and tracking is controlled. Next, the reverse tracking state, for example, magnetic
Scan a different track B1 from when the head 4a recorded
The waveform of each part in FIG. 4 in the case of doing is shown in (ii) of FIG. This place
In this case, f1 is selected as the local pilot signal.
The recorded track B of the pilot signals f0 and f2.
1 will be scanned and therefore the current from circuit 39
Output based on pilot signal f0 from scan track B1
Sampling pulses SP1 and SP2 by force z (see FIG. 5)
E and f) are generated. On the other hand, the current scan from the circuit 33
F1 based on the pilot signal f2 from the track B1
The component of f2 (w in Fig. 5 (ii) b) is detected,
Traffic based on the pilot signal f1 from the clocks A1 and A2.
No locking error information is detected. Therefore, in FIG.
As is clear from the waveform of i), the output voltage from the circuit 34 is
Voltage and the output voltage from the circuit 35 do not match, and
It becomes unbalanced and the circuit 36 gives a large error
Pressure is output. As is clear from this, the reverse tiger
The system does not stabilize in the locking state, and it is a reverse tracker.
A large error signal is obtained in the
The system pulls in the system synchronously because it works to return to the active state.
The effect of shortening the time is obtained. The above action is
The local pilot signal f1 which is one of the focus points of Ming
f2 should be switched alternately according to the scanning of the magnetic head.
Is obtained by, in other words,
The rack is automatically identified. The pilot signal f0 and the pilot signal
Before and after No. f1 or f2 (see the shaded area in Fig. 3)
The blanking signal fB recorded in the track
The magnetic head 4 is not directly involved in the detection of the error information.
When a head wider than the track pitch is used for a and 4b,
Pilot signal recorded over adjacent tracks
Erase or erase unwanted signals that have already been recorded.
Used to leave. This allows the desired pilot
The effect that the signal can be detected with better S / N is obtained. By the above tracking control,
From the recording area V of the video signal 3 of the magnetic heads 4a and 4b
The video signal reproduced alternately is output from the circuit 16 of FIG.
Pulse I of the video signal processing circuit 30 alternately cut
In this case, the continuous reproduced video signal is replaced by the terminal 200.
b, and the playback pilot signal is added to this playback video signal.
Will not be mixed in. As is apparent from the above, the o
The pilot signal recorded in the barrup portion Q1 is a reproduced image.
It is completely separated from the signal, so its recording level is sufficient
Regeneration pie that can be increased and therefore has good S / N
Stable tracking system that can obtain lot signal
You can control The present invention also tracks pilot signals.
In relation to the amount of misalignment τ between adjacent tracks at the
And the misalignment amount τ can be set arbitrarily.
Can be controlled by the same method as the above-mentioned publicly known example.
There is no promise. Furthermore, regarding this misalignment amount τ,
By arranging them in series, the pilot signal recording area
Tracking error is minimized and time is maximized
You can make information available. Next, for the purpose of the present invention, the implementation of FIG.
Figure shows a pattern diagram of a truck according to another embodiment other than the example
6 shows. FIG. 6 (i) shows the circuits 11, 12, and FIG.
The delay times τ 1, τ 2, and τ 3 of 13 are τ 1 <
of the track obtained as τ, τ2> 2τ, τ3 <2τ
The pattern is shown. FIG. 6 (ii) shows the delay of the circuit 12 of FIG.
The total time τ 2 is τ 2 = 2τ for track A and track B
Then τ 2 = 5 τ
The pattern is shown. Particularly, according to the embodiment of FIG. 6 (ii),
For example, the recording positions of the pilot signals f1 and f2 are track-by-track.
Differently, the adjacent tracks will not overlap each other,
Therefore, the frequencies of the pilot signals f1 and f2 should be the same.
Even if the tracking error amount is detected correctly,
Is an arbitrary frequency of the pilot signal f0 as described above.
These pilot signals f0, f
The effect that 1 and f2 can all be the same is obtained.
It In this case, the pilot signal f0 is used as a reference.
The pilot signals f1 and f2 are reproduced.
Of the track by utilizing the nature that the
Automatic identification can be performed. In the above embodiment, the pilot signal is
The case of recording only in the overlap area Q1 of FIG. 3 is shown.
However, the present invention is not limited to this, and the overlay of FIG.
It is also recorded in the pop-up section Q2, or these overlapping sections
You may make it record in multiple places in Q1 and Q2. Well
Also, instead of recording in these overlapping areas Q1 and Q2,
The recording video signal at the vertical blanking position.
However, in this case, the pilot signal is
The recording position is vertical blanking even if the signal is disturbed.
Since it is a period, it does not appear on the playback screen
It is so in the spirit of Ming. Further, in the present invention, the main message to be recorded
The signal is not limited to video signals only, for example
For example, it can be obtained by digitizing video signals or audio signals.
Suitable for recording any other signal such as PCM signal
It can be used. Further, the disk of the tape 1 in FIG. 1 above.
When the winding angle around 2 is 180 degrees and 2 heads are used
However, the present invention is not limited to this, and generally any volume
It can be applied to the device composed of the attachment angle and any number of heads.
And the recording position of the pilot signal is exceeded.
It is not limited only to the wrap part,
For devices that are configured to prevent
In the longitudinal direction of the rack, the main signal recording area and the pyro
Time-division recording so that it is separated from the recording area of the input signal.
It can also be applied to cases such as Also, the pilot signal
The recording method may be direct recording, or the main signal
As a bias or other signal different from the main signal
It may be recorded as Iias. Any of the above
Even if it does not deviate from the gist of the present invention,
All effects are the same. As described above, according to the present invention,
The fixed head that has been used for tracking control
Can be eliminated, and compatibility problems associated with it can be solved
Can be recorded by the information signal recorded magnetic
Compatible playback of tapes between devices becomes easier, and device reliability is improved.
You can improve your sex. Adjacent at the end of the track
It is possible to eliminate the physical restriction on the amount of misalignment between tracks.
Therefore, the degree of freedom is increased and the device can be easily realized. Also,
The recording area of the pilot signal used for tracking control
Tracking error information that is minimized and maximized in time
S / N can be detected well and stable tracking control can be performed.
Can be performed without interference from pilot signals
It is possible to reproduce high quality information with good S / N.
Wear.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing an embodiment of a magnetic recording / reproducing apparatus according to the present invention. FIG. 2 is a diagram showing a waveform of each part of the above embodiment. FIG. 3 is a diagram showing an example of a track pattern on a magnetic tape recorded and formed according to the above embodiment. FIG. 4 is a diagram showing an embodiment of a tracking control device according to the present invention. FIG. 5 is a diagram showing an example of waveforms at various points in the above-described embodiment. FIG. 6 is a diagram showing another example of a track pattern on a magnetic tape according to another embodiment. [Description of Reference Signs] 9 ... Pulse forming circuit, 10, 11, 12, 13, 14, 15 ... Delay multi-circuit, 16 ... Latch circuit, 18 ... Two-phase division circuit, 19 ... Selection circuit, 25 ... Pilot generation circuit, 26 ... Blanking signal generation circuit, 31 ... Frequency conversion circuit, 36 ... Voltage comparison circuit.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Keiji Noguchi             Stock, 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa             Home Appliance Research Laboratory, Hitachi, Ltd. (72) Inventor Toshifumi Shibuya             Stock, 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa             Home Appliance Research Laboratory, Hitachi, Ltd. (72) Inventor Katsuo Mohri             Stock, 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa             Home Appliance Research Laboratory, Hitachi, Ltd. (72) Inventor Takao Arai             Stock, 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa             Home Appliance Research Laboratory, Hitachi, Ltd. (72) Inventor Akira Terada ▲ 猷 ▼             Stock, 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa             Home Appliance Research Laboratory, Hitachi, Ltd.

Claims (1)

[Claims] 1. Arranged to record information signals on parallel and diagonal tracks on the tape such that the scanning start ends between adjacent tracks are displaced by a predetermined distance X when viewed in the direction perpendicular to the longitudinal direction of the tracks. In the rotary head type recording apparatus including the rotary head, the rotary head occupies at least a part of the track and a third gap portion is provided between the first portion and the second portion. Means for recording pilot signals having mutually different frequencies in the portion and the second portion; the second portion is recorded at a position farthest from the track scanning start end in the direction perpendicular to the track longitudinal direction between adjacent tracks. The first track and the second part adjacent to the first track are approximately 2 times larger than the second part of the first track.
In order not to overlap the first portion of the first track and the first portion of the second track with the second track recorded so as to be closer to the track scanning start end by X. And the first portion of the first track and the second portion of the second track do not overlap each other, and the first portion of the first track is the second portion of the second track. An information signal recording apparatus, characterized in that it has means for arranging the track so as to be closer to the track scanning start end than the second portion of the track. 2. An information signal is recorded or reproduced on parallel and slanted tracks on the tape such that the scanning start ends between adjacent tracks are displaced by a predetermined distance X when viewed in the direction perpendicular to the longitudinal direction of the tracks. A rotary head type recording / reproducing apparatus having a rotary head arranged, wherein the rotary head occupies at least a part of the track to provide a third gap portion between the first portion and the second portion, Means for recording pilot signals having different frequencies in the first portion and the second portion; the second portion is farthest from the track scanning start end in the direction perpendicular to the track longitudinal direction between adjacent tracks. The first track recorded at the position and the second portion adjacent to the first track are approximately 2 times larger than the second portion of the first track.
In order not to overlap the first portion of the first track and the first portion of the second track with the second track recorded so as to be closer to the track scanning start end by X. And the first portion of the first track and the second portion of the second track do not overlap each other, and the first portion of the first track is the second portion of the second track. Means for arranging the track closer to the track scanning start end than the second portion of the track; and a track adjacent to the track based on the reproduction timing of the pilot signal recorded in the first part between the adjacent tracks. Above the second
Means for detecting the reproduced level of the pilot signal recorded in the second portion at a timing corresponding to the position of at least a portion of the rotary head; and the rotary head based on the output from the detecting means. An information signal recording / reproducing apparatus characterized in that the relative position of the tape and the tape is controlled.