JPH08147804A - Recording and reproducing device - Google Patents

Abstract

PURPOSE: To increase the accuracy of an insert recording by performing the tracking control of a recording head based on the information of a scanning position for a magnetic tape. CONSTITUTION: At the time of an insert mode, a tracking information signal S61 for alternately arranging signals S16 and S18 obtained by scanning an audio and a video signal recording regions by means of regenerating heads 53, 54 with a prescribed timing by a switch 70 is formed. The tracking errors of recording heads 51, 52 are detected by means of a dynamic tracking error detecting circuit 71 from this information. Driving operation of head moving parts 60, 61 are controlled and the tracking control of the recording heads 51, 52 is performed based on the error information S61. Consequently, respective recording heads exactly scan the objective recording tracks on the magnetic tape.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. Industrial Application Conventional Technology (FIGS. 6 to 8) Problems to be Solved by the Invention (FIGS. 6 to 9) Means for Solving Problems (FIGS. 1 to 5) Actions (FIGS. 1 to 5) Example (FIGS. 1 to 5) (1) Configuration of video tape recorder according to example (FIG. 1)
9) (2) Operation of the embodiment (FIGS. 1 to 9) (3) Effect of the embodiment (FIGS. 1 to 9) (4) Other embodiment (FIGS. 1 to 9) Effect of the invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus, and is suitable for application to, for example, an 8 [mm] type video tape recorder having an insert recording mode.

[0003]

2. Description of the Related Art Conventionally, in this type of video tape recorder, a recording track 1 as shown in FIG.
A so-called helical scan method is used in which the magnetic tape 2 is sequentially formed obliquely in the longitudinal direction of the magnetic tape 2.
In this case, each recording track 1 has a PCM (Pulse Code Mod
(modulation) modulated audio signal (PCM audio signal) and an FM-modulated audio signal superimposed on a video signal (video signal) in a predetermined area (each of these areas is referred to as a PCM audio signal). The tracking signal is recorded in the recording area 1B and the video signal area 1A) in a superposed state.

Thus, in this type of video tape recorder, new video information and / or audio information is recorded in the reproduction mode or in the corresponding areas 1A and 1B of the recording track 1 previously formed on the magnetic tape 2, that is, so-called. In the insert recording mode, etc., the magnetic head is used for each recording track 1
So as to reproduce the video information and audio information recorded in each recording track 1 while performing tracking control based on the tracking signal obtained by scanning the video signal, or insert-record the supplied video information and / or audio information. Has been done.

FIG. 7 shows an example of the configuration of such a conventional video tape recorder. In the video tape recorder 10, for example, in the normal recording mode, the audio signal S1 supplied to the audio signal input terminal 11 is inputted. Then, the PCM audio recording system circuit 12 performs predetermined signal processing such as PCM modulation, and then inputs this as a PCM audio signal S2 to the adding circuit 13 and the video signal S3 supplied to the video signal input terminal 14. After being subjected to predetermined signal processing in the video recording system circuit 15, it is input to the adding circuit 13 as a recording video signal S4.

At this time, in the adding circuit 13, the first or second recording / reproducing heads 16 and 17 attached to a rotating drum (not shown) with an angle difference of 180 ° are respectively attached to the magnetic tape 2 (see FIG. 6) ATF (Aurtomatic Track Finding) of the tracking control system 40 at the timing of scanning above
A first, second, third or fourth ATF signal S5 as a tracking signal having different frequencies from each other is cyclically supplied from the signal generating circuit 18.

Thus, the adding circuit 13 sequentially forms the recording signal S6 of a predetermined format by sequentially superimposing the ATF signal on the PCM audio signal S2 and the recording video signal S4, and the amplifying circuit 19 corresponding to the recording signal S6.
A and 19B and switch circuits 20A and 20B are sequentially sent to the first or second recording / reproducing heads 16 and 17 to record them on the magnetic tape 2 (FIG. 6). Thus, this video tape recorder 10
Then, the recording track 1 (FIG. 6) in which the ATF signals S5 having different frequencies are cyclically superimposed by the first and second recording / reproducing heads 16 and 17 is used as the magnetic tape 2
(FIG. 6) The supplied audio signal S1 and video signal S3 are sequentially formed on the magnetic tape 2 to be formed.
Record above.

On the other hand, in the reproduction mode, the reproduction signal S10 obtained through the first recording / reproducing head 16 is transmitted through the switch circuit 20A and the amplifying circuit 30A to the first switching end 31A of the switch circuit 31 and the switch circuit 32. It is supplied to each of the first switching ends 32A. Similarly, the reproduction signal S11 obtained via the second recording / reproducing head 17 is
The second switching end 31B of the switch circuit 31 and the switch circuit 3 are connected via the switch circuit 20B and the amplifier circuit 30B.
Two second switching ends 32B, respectively.

The switch circuit 31 selects the first switching end 31A at the timing when the first recording / reproducing head 16 scans the PCM audio signal recording area 1B of each recording track 1 (FIG. 6), and at the same time, selects the second switching end 31A. Recording / playback head 17
At the timing of scanning on the PCM audio signal recording area 1B of each recording track 1 (FIG. 6).
Playback PC consisting of only PCM audio signal S15 selected from B and thus played back from the magnetic tape as shown in FIG. 8C.
The M audio signal S16 is formed.

This reproduction PCM audio signal S16 is supplied to the PCM audio reproduction system circuit 33 shown in FIG.
After being demodulated in the M audio reproduction system circuit 33, it is output from the audio signal output terminal 34. Similarly, the switch circuit 32 selects the first switching end 32A at the timing when the first recording / reproducing head 16 scans the video signal recording area 1A of each recording track 1 (FIG. 6), and at the same time, selects the second switching end 32A. At the timing when the recording / reproducing head 17 scans the video signal recording area 1A of each recording track 1, the second
The switching end 32B is selected, thus forming a reproduced video signal S18 consisting of only the reproduced video signal S17 as shown in FIG. 8 (D).

The reproduced video signal S18 is supplied to the video reproduction system circuit 35 shown in FIG.
After being subjected to predetermined signal processing in 5, the video signal is output from the video signal output terminal 36. In this way, the video tape recorder 10 reproduces the audio information and the video information recorded on the magnetic tape 2 (FIG. 6), and reproduces these audio information and video information, respectively.
Output from 6.

In this case, E is output from the switch circuit 31.
The reproduced PCM audio signal S16 is also supplied to the low-pass filter circuit 41 of the tracking control system 40. The low-pass filter circuit 41 reproduces the reproduction PCM audio signal S1.
Extract the ATF signal superimposed on 6 and reproduce it.
The signal S20 is sent to the capstan phase servo circuit 42. At this time, the capstan phase servo circuit 42 is connected to the ATF signal generation circuit 18 from the above-mentioned first to fourth ATF circuits.
The signal S5 is sequentially supplied at a predetermined timing.

Thus, the capstan phase servo circuit 42
Is based on the ATF signal S5 and the reproduction ATF signal S20, and the existing method (for example, the first or second recording / reproducing head 16,
2nd preceding the first recording track 1 targeted by 17
Of the signal level of the ATF signal detected from the first recording track 1 and the signal level of the ATF signal detected from the third recording track 1 following the first recording track 1 and the second recording / reproducing head 16 or 17. The tracking error amount (that is, the offset amount from the just tracking position) of the first and second recording / reproducing heads 16 and 17 is detected by comparing with the signal level), and the detection result is used as a tracking error signal S21. It is sent to the adder circuit 43.

At this time, the capstan motor 4 is moved from the frequency generator 45 attached to the capstan motor 44.
An FG signal S30 having a frequency corresponding to the rotation frequency of 4 is output and supplied to the capstan frequency servo circuit 47 through the FG amplifier circuit 46, and the capstan frequency servo circuit 47 is obtained based on the FG signal S30. The frequency servo error signal S31 is sent to the adder circuit 43.

Thus, the adder circuit 43 generates the tracking control signal S32 by adding the tracking error signal S21 and the frequency servo error signal S31, and the tracking control signal S32 is supplied to the capstan motor 44 via the motor drive amplifier circuit 48. The capstan motor 44 is drive-controlled by sending out.

In this way, in the video tape recorder 10, the rotation frequency of the capstan motor 44 is controlled based on the FG signal S30, and the ATF signal (reproduction ATF signal S2) obtained from the reproduction PCM audio signal S16 is controlled.
0), the phase of the capstan motor 44 is controlled, and thus the tracking control for the first and second recording / reproducing heads 16 and 17 is performed.

Further, in the video tape recorder 10, the first recording / reproducing head 16 scans the PCM audio signal recording area 1B of the recording track 1 (FIG. 6) in the insert recording mode for inserting and recording video information. When the switch circuit 20A selects the first switching end 20AX, the reproduction signal S output from the first recording / reproducing head 16 as shown in FIG.
10 is supplied to the low-pass filter circuit 41 of the tracking control system 40 via the switch circuit 20AX, the amplifier circuit 30A, and the switch circuit 31.

Similarly, when the second recording / reproducing head 17 is scanning over the PCM audio signal recording area 1B of the recording track 1 (FIG. 6), the switch circuit 20B selects the first switching end 20BX. By the second
The reproduction signal S11 as shown in FIG. 8B output from the recording / reproducing head 17 is supplied to the low pass filter circuit 41 of the tracking control system 40 through the switch circuit 20B, the amplifier circuit 30B and the switch circuit 31. Thus, the tracking control system 40 drives and controls the capstan motor 44 in the same manner as in the above-described reproduction mode, and thereby the first and second recording / reproducing heads 16 and 1 are provided.
The tracking control for 7 is executed.

On the other hand, in the insert recording mode, the first or second recording / reproducing heads 16 and 17 are the recording tracks 1
When scanning the video signal recording area 1A (FIG. 6), the corresponding switch circuits 20A and 20B select the second switching ends 20AY and 20BY. At this time, the video signal S3 supplied to the video signal input terminal 14 is supplied to the second switching terminals 20AY and 20BY of the switch circuits 20A and 20B in the video recording system circuit 15 in the same manner as in the above-described recording mode. After the signal processing, the ATF signal S of the corresponding frequency is added in the adder circuit 13.
5 is supplied as a recording signal S6 in a superimposed state.

Thus, the recording signal S6 is supplied to the first and second recording / reproducing heads 16 and 17 via the corresponding switch circuits 20A and 20B, and is supplied to the first or second recording / reproducing heads 16 and 17. Therefore, it is recorded on the magnetic tape 2 (FIG. 6) as shown in FIGS. 8 (A) and 8 (B). Thus, in this video tape recorder 10, the PCM audio signal recording area 1 of each recording track 1 (FIG. 6) is recorded.
While controlling the tracking based on the ATF signal S5 recorded in B, the video signal S3 supplied to the video signal input terminal 14 is sequentially insert-recorded in the video signal input area 1A of each recording track 1. There is.

[0021]

However, in the case of the video tape recorder 10 of this type, the width (track width) of the recording track 1 formed on the magnetic tape 2 (FIG. 6) in the 8 [mm] system is 20 [μm]. And it is very small.
As shown in (A) and (B), a track pattern of a recording track (hereinafter referred to as an insert track) 1'formed by insert recording shown by a solid line is formed in advance on the magnetic tape 2 shown by a broken line. There is a case where the track pattern of the recording track (hereinafter, referred to as a base track) 1 is deviated. Note that FIG. 9A shows a case where the track pattern of the insert track 1'is shifted in the traveling direction of the magnetic tape 2 shown by the arrow a as compared with the track pattern of the base track 1, and FIG.
Shows the case where the track pattern of the insert track 1 ′ is shifted in the direction opposite to the traveling direction of the magnetic tape 2 as compared with the track pattern of the base track 1.

Such a phenomenon is caused by an error in the linearity of the recording pattern between the video tape recorder having the base track 1 formed on the magnetic tape 2 and the video tape recorder having the insert track 1'formed on the magnetic tape 2. The error occurs due to a tracking error during insert recording, expansion and contraction of the magnetic tape 2 after the base track 1 is formed, and before insert recording is performed. In such a case, as is clear from FIGS. 9A and 9B, at the insert start point (IN point) and end point (OUT point),
Since the newly formed insert track 1'extrudes on a part of the base track 1 to be preserved, the base track 1 is thin or thin, or the base track 1 to be newly rewritten.
Since a part of the data remains unerased, C / N decreases due to a decrease in the level of the reproduced signal at the start point and the end point of this insert recording during reproduction, and beat interference due to unnecessary signals occurs. There was a problem that normal playback could not be performed.

Further, in recent years, digital recording of video tape recorders has been progressing. In this case, in the digital recording, the C / N can usually be made smaller than that in the analog recording, so that the track width of the recording track 1 is further reduced (about 5 to 10 [μm]). Therefore, in the case of such digital recording, the deviation of the insert track 1'with respect to the base track 1 as described above may cause a greater problem than in the case of analog recording.

Here, as one of conventional tracking control methods, for example, as disclosed in Japanese Patent Laid-Open No. 61-104419, a magnetic head is attached to a rotary drum via a piezoelectric element such as a bimorph, and There is a so-called dynamic tracking control method in which the magnetic head is made to follow the recording track formed on the magnetic tape by driving the piezoelectric element so as to control the signal level of the drive signal given to the piezoelectric element. .

However, the dynamic tracking control method has so far been proposed only to be used for the tracking control of the reproducing magnetic head, and such a tracking control method is used for the tracking control of the recording magnetic head. If this is also applied, it is considered that it is possible to realize a recording / reproducing apparatus that can perform insert recording with high accuracy and can solve such problems all at once.

The present invention has been made in consideration of the above points, and is intended to propose a recording / reproducing apparatus capable of performing insert recording with high accuracy.

[0027]

In order to solve such a problem, according to the present invention, a corresponding area (1) of a recording track (1) which is obliquely formed in advance on a magnetic tape (2) is formed.
In a recording / reproducing apparatus having an insert recording mode for recording new video information (S3) and / or audio information (S1) in (A, 1B), the magnetic tape (2) is sequentially rotated obliquely with respect to the running direction. A rotary drum (80) and a recording head (51, 52) mounted on the rotary drum (80)
And the reproducing heads (53, 54) preceding the recording heads (51, 52) are integrally held, and the held recording heads (51, 52) and reproducing heads (53, 54) are held together.
The recording heads (51, 52) and the reproducing heads (53, 54) for the magnetic tape (2) are integrally formed as necessary.
A plurality of head holding means (60, 61) for displacing the heads in a predetermined direction having an angle with the advancing direction of the heads, and reproduction heads (53, 54) held by the head holding means (60, 61) in the insert recording mode. ), Based on the scanning position information of each recording head (51, 52) obtained by scanning each recording track (1) of the magnetic tape (2), the corresponding head holding means (60, 61) Control means (7) for driving and controlling the recording heads (51, 52) so as to scan on the target recording track (1).
1) and are provided.

Further, in the present invention, each head holding means (60, 61) has a corresponding recording head (51, 52).
And the playback head (53, 54) to the recording head (5
1, 52) and the reproducing heads (53, 54) are held together so as to scan on the same recording track (1) formed on the magnetic tape (2).

Further, in the present invention, each head holding means (60, 61) has a corresponding recording head (51, 5).
2) and the reproduction head (53, 54) are integrally held so that the reproduction head (53, 54) scans the recording track (1) which precedes the recording head (51, 52) by a plurality of tracks. I decided to do it.

[0030]

The recording head (51, 52) and the reproducing head (5)
3, 54) are respectively held by the head holding means (60, 61), and in the insert recording mode, each reproducing head (53, 54) scans each recording track (1) of the magnetic tape (2). Obtained recording head (5
1, 52) corresponding head holding means (60, 61) on the basis of the scanning position information.
The drive control is performed so that 52) scans on the target recording track (1), so that the recording track (1) accurately formed on the magnetic tape (2) on each recording head (51, 52). ) It is possible to realize a recording / reproducing apparatus that can scan the upper part and can perform insert recording with high accuracy.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

(1) Structure of Video Tape Recorder According to Embodiment In FIG. 1 in which parts corresponding to those in FIG. 7 are designated by the same reference numerals, numeral 50 denotes an insert recording mode as a whole 8
[Mm] system video tape recorder, showing first and second recording heads 51 and 52 and first and second reproducing heads instead of the first and second recording and reproducing heads 16 and 17 (FIG. 6). 53 and 54 are provided, and in the insert recording mode, in addition to the tracking control operation described above by the tracking control system 40, the first and second dynamic tracking control systems 55 are newly added. 6 is almost the same as the video tape recorder 10 shown in FIG. 6 except that the recording heads 51 and 52 are tracking-controlled by a known dynamic tracking control method based on the reproduction outputs of the reproduction heads 53 and 54. It is configured.

In this case, the first recording head 51 and the first reproducing head 53 are provided on a rotating drum (usually an upper drum) (not shown) which rotates with respect to the magnetic tape 2 (FIG. 6).
As described above, the first head of the dynamic tracking control system 55 (FIG. 1) is moved so that the first reproducing head scans the same recording track 1 of the magnetic tape 2 ahead of the first recording head. It is attached via the part 60.
At this time, in the first head movable portion 60, the first recording head 51 and the first reproducing head 53 are perpendicular to the traveling direction of the rotary drum in accordance with the supplied tracking error signal S50. It can be displaced in any direction.

Similarly, the second recording head 52 and the first recording head 52
The reproducing head 54 of the magnetic head 2 is a rotating head so that the second reproducing head 54 scans the same recording track 1 of the magnetic tape 2 ahead of the second recording head 52. It is attached via the second head movable part 61 of 1). At this time, in the second head movable portion 61, only the second recording head 52 is moved to the extent based on the supplied tracking error signal S51.
Also, the second reproducing head 54 can be displaced in a direction perpendicular to the traveling direction of the rotating drum as it rotates.

As a result, the video tape recorder 50
In the insert recording mode, the tracking error signals S50 and S51 given to the first and second head movable parts 60 and 61 are adjusted based on the reproduction outputs of the first and second reproduction heads 53 and 54. Therefore, the first or second
The reproducing heads 53 and 54 of the magnetic head 2 are controlled so as to accurately scan the target recording track 1 formed on the magnetic tape 2 (FIG. 2), and as a result, the first and second recording heads 51 and 52 are obtained. Tracking control is performed.

In practice, in the case of the video tape recorder 50, in the recording mode, the adding circuit is based on the audio signal S1 supplied to the audio signal input terminal 11 and the video signal S3 supplied to the video signal input terminal 14 of FIG. By sending the recording signal S6 output from 13 to the first and second recording heads 51 and 52 through the corresponding amplifier circuits 19A and 19B, these audio signal S1 and video signal S3 are recorded.
Recording is performed on the magnetic tape 2 in the same manner as (FIG. 6).

In the reproduction mode, the reproduction signals S10 and S output from the first and second reproduction heads 53 and 54 are output.
11 through the amplifier circuits 30A and 30B and the corresponding switch circuits 31 and 32 in sequence and at a predetermined timing, the PCM audio signal reproduction system circuit 33 or the video signal reproduction system circuit 3
5, the video information and the audio information recorded on the magnetic tape 2 (FIG. 2) are reproduced, and the reproduced PCM audio signal S1 output from the switch circuit 31 is reproduced.
Based on No. 6, the tracking control system 40 drives and controls the capstan motor 44 to perform tracking control in the same manner as the video tape recorder 10 (FIG. 6).

On the other hand, in the insert recording mode, when the first or second reproducing head 53, 54 is scanning over the PCM audio signal recording area 1B of the base track 1 formed on the magnetic tape 2 (FIG. 2), The switch circuit 31 has the first or second switching terminals 31A, 31 at a predetermined timing.
Playback PCM audio signal S16 by selecting B
(FIG. 8 (C)) is formed, and the tracking control system 4
0 to the low-pass filter circuit 41, so that the tracking control system 40 receives the first and second reproducing heads 53 and 54 (and the first and second recording heads 51 and 5).
2. Perform tracking control for 2).

At this time, the reproduced PCM audio signal S16 is the switch circuit 7 of the dynamic tracking control system 55.
It is also supplied to the first switching end 70A of 0. The switch circuit 70 is provided for each base track 1 in which the first or second reproducing head 53, 54 is formed on the magnetic tape 2 (FIG. 2).
The first switching end 70A is selected at the timing of scanning on the PCM audio signal recording area 1B, and the reproduction PCM audio signal S16 (FIG. 8) thus obtained is obtained.
A signal similar to (C)) is sent to the dynamic tracking error detection circuit 71 as a tracking information signal S60.

The dynamic tracking error detection circuit 71 uses the existing predetermined method (for example, the first or second reproduction heads 53, 54) based on the first to fourth ATF tracking signals obtained from the tracking information S60. The signal level of the ATF tracking signal detected from the second background track 1 preceding the desired first background track 1 (FIG. 2) and the first or second reproduction heads 53 and 54 correspond to the second background track. Third ground track 1 following track 1
By comparing the signal level of the ATF tracking signal detected from the first or second reproduction head 53,
A tracking error amount (offset amount) with respect to the track pattern of the base track 1 of 54 is detected, and tracking error signals S50 and S51 based on the detection result are generated, and the low-pass filter circuit 72, the first and second amplification circuits It is sent to the first and second head movable devices 60 and 61 via the circuits 73A and 73B.

The first head moving device 60 is driven on the basis of the tracking error signal S50, so that the first track head 53 (and the first recording head 51) is the target background track 1 (FIG. 2). ) The first reproducing head 53 (and the first recording head 51) is displaced in a direction perpendicular to the traveling direction of the magnetic tape 2 (FIG. 2) so as to accurately scan above.

Similarly, the second head movable device 61 is
Driving based on the tracking error signal S51 causes the second reproduction head 54 (and the second recording head 52) to accurately scan the desired underlayer track 1. (And the second recording head 52) is displaced in a direction perpendicular to the traveling direction of the magnetic tape 2.

In this way, the dynamic tracking error detection circuit 71 operates in the first recording mode in the insert recording mode.
Alternatively, while the second reproducing heads 53, 54 are scanning over the PCM audio signal recording area 1B of the base track 1 formed on the magnetic tape 2, the first and second reproducing heads 53, 54 (and Tracking control is performed on the first and second recording heads 51 and 52).

At this time, if the selected insert recording mode is, for example, a mode in which the video signal S3 and the audio signal S1 are insert-recorded, or a mode in which only the audio signal S1 is insert-recorded, the first and second insert recording modes are selected. The audio signal S1 PCM-modulated in the recording heads 51 and 52 in the same manner as in the above-described recording mode is AT
Recording signal S with F tracking signal S5 superimposed
Supplied as 6. Thus, the video tape recorder 50 insert-records the recording signal S6 in the PCM audio signal recording area 1B of the base track 1 formed on the magnetic tape 2 by the first or second recording heads 51 and 52.

On the other hand, in the insert recording mode, the first or second reproducing heads 53, 54 are formed on the magnetic tape 2 (FIG. 2) in advance, and the corresponding base track 1 (FIG. 2) is formed.
Of the video signal recording area 1A (FIG. 2), the switch circuit 32 selects the first or second switching end at a predetermined timing to reproduce the reproduced video signal S18 (FIG. 8D). Is formed, and this is supplied to the video signal reproducing circuit 35 and the second switching end 70B of the switch circuit 70 of the dynamic tracking control system 55.

The switch circuit 70 includes one of the first and second switches.
Reproduction heads 53 and 54 scan over the video signal recording area 1A of each background track 1, and the other second or first reproduction heads 54 and 53 scan over the PCM audio signal recording area 1B of each background track 1. The second switching end 70B is selected at the non-scanning timing, and the result obtained in FIG.
The reproduced video signal S18A as shown in (E) is sent to the dynamic tracking error detection circuit 71 as the tracking information signal S60.

The dynamic tracking error detection circuit 71 has a first circuit obtained from the tracking information signal S60.
~ The first or second playback heads 53, 54 based on the fourth ATF tracking signal by the existing method as described above.
The tracking error amount (offset amount) with respect to the track pattern of the background track 1 is detected, and the tracking error signals S50 and S51 based on the detection result are output to the low-pass filter circuit 72 and the first and second amplifier circuits 73A and 73A.
3B sequentially through the first and second head movable devices 60,
Send to 61.

The first head movable device 60 is driven on the basis of the tracking error signal S50, and if necessary, the first reproduction head 53 (and the first recording head 51) is the target background track. The first reproducing head 53 and the first recording head 51) are displaced in a direction perpendicular to the traveling direction of the magnetic tape 2 so as to accurately scan over the magnetic tape 1. Similarly, the second head movable device 61
Is driven based on the tracking error signal S51 so that the second reproducing head 54 (and the second recording head 52) accurately scans the desired underlying track 1 if necessary. The second reproducing head 54 (and the second recording head 52) is displaced in the direction perpendicular to the traveling direction of the magnetic tape 2.

In this way, the dynamic tracking error detection circuit 71 operates in the first recording mode in the insert recording mode.
Alternatively, while the second reproduction heads 53 and 54 are scanning over the video signal recording area 1A of the underlayer track 1 formed on the magnetic tape 2, the first and second reproduction heads 53 and 54 (and The first and second recording heads 51,
52) tracking control.

At this time, if the selected insert recording mode is, for example, a mode in which the video signal S3 and the audio signal S1 are insert-recorded, or a mode in which only the video signal S3 is insert-recorded, the first and the second are selected.
The video signal S3, which has been subjected to predetermined signal processing in the same manner as in the recording mode, is supplied to the recording heads 51 and 52 as the recording signal S6 in the state where the ATF tracking signal S5 is superimposed. Thus, this video tape recorder 50
The recording signal S6 is transmitted to the first or second recording head 51,
Base track 1 formed on magnetic tape 2 by 52
Insert recording is performed in the video signal recording area 1A.

Thus, this video tape recorder 50
Then, by the tracking control system 40, a few [H
z] up to the first and second reproducing heads 53, 54 (and the first and second recording heads 51, 52) tracking errors, while the dynamic tracking control system 55 Is also designed to handle errors in the high frequency range.

In the case of this embodiment, the first and second head movable parts 60 and 61 are constructed as shown in FIGS. 3 (A) and 3 (B). That is, in the first head movable portion 60, the bimorph 81 is provided on the lower surface of the upper drum 80 that is rotationally driven with respect to the lower drum that is fixedly arranged (not shown).
And a head base 82 are sequentially attached integrally, and the first recording head 51 and the first reproducing head 53 are integrally fixed to the head base 82.

Accordingly, in the first head movable part, the bimorph 81 is warped with one end fixed to the upper drum 80 as a fulcrum by an amount corresponding to the voltage value of the supplied tracking key error signal S50. The first reproducing head 53 and the first recording head 51 are integrated into the magnetic tape 2
It can be displaced in a direction perpendicular to the traveling direction with respect to (FIG. 2).

In the same manner, the second head movable portion 61 has a bimorph 83 and a head base 84 integrally attached to the lower side surface of the upper drum 80 integrally with each other with an angle difference of 180 [°] from the first head movable portion 60. The second reproduction head 54 and the second recording head 5 are added to the head base 84.
2 are fixed integrally with the first reproducing head 53 or the first recording head 51 so as to have an angle difference of 180 [°].

Therefore, in the second head movable portion, as in the case of the first head movable portion 60, the bimorph 83 is fixed to the upper drum 80 by an amount corresponding to the voltage value of the supplied tracking key error signal S51. Further, the second reproducing head 54 and the second recording head 52 can be integrally displaced in a direction perpendicular to the traveling direction with respect to the magnetic tape 2 (FIG. 2) by bending back with one end as a fulcrum.

(2) Operation of the Embodiment With the above construction, in the video tape recorder 50, in the insert recording mode, the first and second reproducing heads 53 and 54 are the base tracks formed on the magnetic tape 2, respectively. The reproduced PCM audio signal S16 and the reproduced video signal S18 obtained by scanning the PCM audio signal recording area 1B and the video signal recording area 1A of No. 1 are respectively the dynamic tracking control system 55.
The first or second switching end 70A of the switch circuit 70 of
Supplied to 70B.

The switch circuit 70 selects the first or second switching terminal 70A or 70B at a predetermined timing to reproduce the reproduction PCM audio signal S as shown in FIG. 8 (E).
16 and the reproduced video signal S18 are alternately arranged to form a tracking information signal S61, which is sent to the dynamic tracking error detection circuit 71. The dynamic tracking error detection circuit 71 includes the first and second reproducing heads 53 and 54 (and the first and second recording heads 5) obtained from the tracking information signal S61.
1, 52) by controlling the driving of the first and second head movable parts 60, 61 based on the tracking error information of (1 and 52), the first and second reproducing heads 53 and 54 (and the first and second reproducing heads 53 and 54). Tracking control of the recording heads 51, 52) is performed.

Therefore, in the video tape recorder 50, the tracking control of the first and second reproduction heads 53 and 54 in the insert recording mode is performed by the first and second reproduction heads 53 and 54 of the base track 1. When scanning over the PCM audio signal recording area 1B, it is recorded in the PCM audio signal recording area 1B.
Performed using ATF tracking signal, and first and second
When the reproduction heads 53 and 54 of the above are scanning the video signal recording area 1A of the base track 1, the ATF tracking signal recorded in the video signal recording area 1A is used. Playhead 5
3 and 54 are accurately aligned with the track pattern of the base track 1 for scanning (that is, the first and second reproducing heads 5 and 5).
3 and 54 can be accurately scanned on each base track 1.

Therefore, according to the video tape recorder 50, the first or second head movable portion 60, 61 is so moved as to scan on the same underlying track 1 as the first and second reproducing heads 53, 54. The first and second recording heads 51, 52 attached to the first and second reproducing heads 5 and
Since the underlying track 1 can be accurately scanned as in Nos. 3 and 54, at the start point and the end point of the insert recording as shown in FIGS. 9A and 9B, which has been a problem in the conventional insert recording. It is possible to surely avoid problems such as tapering of the base track 1 and unerased parts.

Incidentally, in this case, as is clear from FIGS. 8C to 8E, one of the first and second regeneration heads 5 is formed.
3 and 54 are video recording areas 1A of the base track 1
The last part (ie, each ground track 1 in FIG. 6)
The reproduction video signal S18A obtained by scanning the second reproduction head 54, 53
PCM audio signal recording area 1 of background track 1
It is not supplied to the dynamic tracking error circuit 71 because it overlaps with the timing of scanning over B, but since this portion is 1/6 of the entire background track 1, there is almost no problem in tracking control.

Further, in this video tape recorder 50,
Since the tracking error information after the tracking control is fed back to the dynamic tracking error detection circuit 71, the loop gain and the loop filter (the low pass filter circuit 7) are provided like the tracking control system 55.
The response speed can be selected according to 2).

(3) Effects of the Embodiments With the above arrangement, the first reproducing head 53 and the first recording head 51 are scanned over the same underlayer track 1, and the first reproducing head 53 is used. First record head 51
Is attached to the first head movable part 60 so that the second reproduction head 54 and the second recording head 5 are connected to each other.
2 to scan over the same underlying track 1, and the second
Of the reproducing head 54 of the second recording head 52 is attached to the second head movable portion 61 so that the first and second reproducing heads 53 and 54 scan the base track 1 of the magnetic tape 2. Based on the tracking error information obtained by the above, the first and second head movable parts 6 are
The first and second recording heads 5 are integrated with the first and second reproduction heads 53 and 54 by controlling the driving of 0 and 61.
1,52 Tracking (Dynamic Tracking)
, The first or second reproduction head 53,
By the first and second recording heads 51 and 52 following 54, the supplied audio signal S1 and / or video signal S3 is insert-recorded,
It is possible to surely avoid problems such as taper and unerased portions of the background track 1 at the start point and the end point of insert recording, and thus to realize a video tape recorder capable of performing insert recording with high accuracy.

(4) Other Embodiments In the above-described embodiments, the dynamic tracking control by the dynamic tracking control system 55 is performed only in the insert recording mode. However, the present invention is not limited to this. Not limited to this, it may be performed in the reproduction mode or the recording mode.

Further, in the above embodiment, the present invention is
The case where the video tape recorder 50 of the [mm] type is applied has been described, but the present invention is not limited to this.
It may be applied to a home video tape recorder. In this case, in this type of video tape recorder, as a recording format, as shown in FIG. 4, each recording track 100 formed on the magnetic tape 2 has a PCM audio signal recording area 100B and a video signal recording area 100.
In addition to A, a recording area 100C dedicated to a tracking signal at its tip (lower end in FIG. 4) is provided so that the tracking signal can be stored even when a video signal or an audio signal is insert-recorded. However, even this type of recording format is 8 mm.
Since the tracking signal is superimposed and recorded on each recording track 100 as in the case of the system, the present invention can be applied.

Further, in the above embodiment, the case where the ATF tracking method using the first to fourth tracking signals S5 is applied as the normal tracking method by the tracking control system 40 has been described.
The present invention is not limited to this.
In the case of a format without F signal, several hundred [Hz]
In the bimorphs 81 and 83, a so-called wobbling method is also used, in which a track shift is performed at a repetition frequency of 1 to several tenths of a track width, and a track shift is detected based on the level change of the reproduced signal at that time. Can be applied by using.

Further, in the above-mentioned embodiment, the case where the video signal S3 and the audio signal S1 are insert-recorded without erasing the base track 1 formed on the magnetic tape 2 has been described. Not limited to this, the first and second playback heads 53,
4, an erasing head is provided in addition to the first and second recording heads 51 and 52, and the first and second erasing heads are erased while the erasing head 1 is erased by the erasing head. The insert track 1'may be formed by the recording heads 51 and 52 of FIG. Figure 5
(A) shows an example of the configuration in which the erasing heads 101A and 101B are arranged in this way, and the first erasing head 101A is arranged between the first reproducing head 53 and the first recording head 51. A second erasing head 101B is provided between the second reproducing head 54 and the second recording head 52.
Is provided.

In this case, the first and second erase heads 101
As shown in FIG. 5B, A and 101B correspond to the first reproduction head 53 and the second reproduction head 54, respectively.
Each trailing track 1 before the corresponding first recording head 51 or second recording head 52.
The first or second head movable part 6 so that the head can be scanned.
0, 61 (FIG. 3), which allows each of the substratum tracks 1 by the first and second regeneration heads 53, 54.
The background track 1 scanned by the first or second recording head 51, 52 is surely erased in advance without disturbing the reproduction operation.

Further, in the above-mentioned embodiment, the first recording head 51 and the first reproducing head 53 scan the same underlayer track 1, and the second recording head 52 and the second recording head 52 are also scanned.
Of the first and second reproducing heads 53 and 54 and the first and second recording heads 51 and 52 so that the reproducing head 54 of the same scans on the same underlying track 1. , 61, but the present invention is not limited to this, and the first and / or second reproducing heads 53, 54 are more suitable than the corresponding first or second recording heads 51, 52. The first and second reproducing heads 53 and 54 and the first and second recording heads 51 and 52 are moved to the first or second head so that the underlying track 1 preceding by one or a plurality of tracks is scanned. Part 6
It may be fixed to 0 and 61.

Further, in the above-mentioned embodiment, the first movable head 60 displaces the first recording head 51 and the first reproducing head 53 integrally in the direction perpendicular to the traveling direction with respect to the magnetic tape 2, The case where the second recording head 52 and the second reproducing head 54 are integrally displaced by the second movable portion 61 in the direction perpendicular to the traveling direction of the magnetic tape 2 has been described. Is not limited to this, but the first and second recording heads 51, 52 and the first
Also, the displacement direction of the second reproducing heads 53, 54 may be a direction other than the direction perpendicular to the traveling direction with respect to the magnetic tape 2, and the point is that the first movable portion 60 is only moved to the extent based on the dynamic error signal S50. 1 recording head 51 and 1
The reproducing head 53 of the magnetic head 2 is displaced in a direction that makes an angle with the traveling direction of the magnetic tape 2, and
Is the second degree by the degree based on the dynamic error signal S51.
If the recording head 52 and the second reproducing head 54 are to be displaced in a direction having an angle with respect to the moving direction of the magnetic tape 2, the first and second recording heads 51 and 52 and the first and second reproducing heads The displacement directions of the heads 53 and 54 may be other than perpendicular to the magnetic tape 2.

[0070]

As described above, according to the present invention, there is an insert recording mode for recording new video information and / or audio information in the corresponding area of the recording track formed in advance on the magnetic tape in a diagonal manner. In the recording / reproducing device,
A rotating drum that is sequentially rotated obliquely with respect to the running direction of the magnetic tape, and a recording head and a reproducing head preceding the recording head that are mounted on the rotating drum are integrally held, and if necessary, the recording head and the reproducing head. A plurality of head holding means for integrally displacing the reproducing head with respect to the recording head and the reproducing head relative to the magnetic tape, and a plurality of reproducing heads respectively held by the respective head holding means in the insert recording mode. Detects the scanning position information of each reproducing head with respect to the magnetic tape based on the reproduction signal obtained by scanning on each recording track of the magnetic tape, and based on the detection result, the corresponding head holding means respectively records the corresponding position. And a control means for controlling the drive so that the head scans on the target recording track. By the, to the recording head can be accurately scanned on recording tracks formed on the magnetic tape, thus recording and reproducing apparatus can be realized which can perform accurately insert recording.

[Brief description of drawings]

FIG. 1 is a block diagram showing the overall configuration of a video tape recorder according to an embodiment.

FIG. 2 is a conceptual plan view showing a recording format of the video tape recorder of the embodiment.

3A and 3B are a sectional view and a bottom view showing a configuration of first and second head movable parts.

FIG. 4 is a conceptual plan view showing a recording format in another embodiment.

FIG. 5 is a bottom view and a conceptual plan view showing another embodiment.

FIG. 6 is a conceptual plan view showing a recording format used in a conventional 8 [mm] type video tape recorder.

FIG. 7 is a block diagram showing a configuration row of a conventional 8 mm type video tape recorder.

8 is a timing chart used to explain each signal in the video tape recorder shown in FIG. 1 and / or FIG.

FIG. 9 is a conceptual plan view for explaining the problems of the conventional video tape recorder. .

[Explanation of symbols] 1 ... Substrate track, 1A ... Video signal recording area, 1
B: PCM audio signal recording area, 2 ... magnetic tape, 31, 32, 70 ... switch circuit, 40 ... tracking control system, 50 ... video tape recorder, 5
1, 52 ... Recording head, 53, 54 ... Replay head,
55 ... Dynamic tracking control system, 60, 61
...... Head moving part, 71 ...... Dynamic tracking error circuit, S1 ...... audio signal, S3 ...... video signal, S10, S11 ...... playback signal, S50 ...... dynamic error signal.

Claims (3)

[Claims] 1. A recording / reproducing apparatus having an insert recording mode for recording new video information and / or audio information in a corresponding area of a recording track formed on a magnetic tape in a diagonally sequential manner. A rotary drum that rotates in a diagonal direction with respect to the direction and a rotary head mounted on the rotary drum to integrally hold a recording head and a reproducing head preceding the recording head, and to hold the recording head and the reproducing head that are held. Accordingly, a plurality of head holding means for integrally displacing the recording head and the reproducing head with respect to the magnetic tape in a predetermined direction having an angle with the advancing direction of the recording head and the reproducing head, and the respective reproductions held by the respective head holding means in the insert recording mode. Each recording head obtained by scanning a head over each recording track of the magnetic tape. A control means for driving and controlling each of the corresponding head holding means based on the scanning position information for the magnetic tape so that the recording head scans the intended recording track. Recording / playback device. 2. Each of the head holding means integrally holds the corresponding recording head and reproduction head so that the recording head and the reproduction head scan over the same recording track formed on the magnetic tape. The recording / reproducing apparatus according to claim 1, wherein: 3. Each of the head holding means integrally holds the corresponding recording head and the corresponding reproducing head so that the reproducing head scans the recording track preceding the recording head by a plurality of tracks. The recording / reproducing apparatus according to claim 1, wherein: