JPH0440609A - Dubbing system - Google Patents

Abstract

PURPOSE:To execute dubbing at a high speed by setting up a shifting variable in the rotational axis direction of an adjacent head in accordance with various track pitches. CONSTITUTION:In the secured state of a prescribed positional deviation in the rotational axis direction based upon a track pitch specified on the recording side, heads Ha', Hb' shift in the rotational axis direction by one track of a track pitch continuously specified during the period of 5/6 field for tracing a tape 40 and resetting them during the period of residual 1/6 field is repeated in each field by electric distortion elements 61a'. 61b'. The elements 61a', 61b' are controlled by a servo circuit 26. Thus, dubbing at twice the speed of normal recording/reproducing operation can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dubbing system, and in particular, a dubbing system in which information signals for a predetermined period are recorded, each of which has a large number of tracks with different azimuth angles between adjacent tracks. The present invention relates to a dubbing system for a tape-shaped recording medium formed at any pitch.

[Prior Art] As mentioned above, there is a home-use helical scan video tape recorder (VTR) as a device for recording and reproducing information signals for a predetermined period on each track of a tape-shaped recording medium. A dubbing system using a VTR will be explained.

Generally, a so-called rotating two-head helical scan type VTR is known as a home VTR. Figure 6 (A), (B
) is a diagram showing a general head arrangement of this type of VTR. In FIGS. 6(A) and (B), 1 is a magnetic tape, 2
Reference numerals a and 2b designate tape guides for winding the tape 1 around the outer periphery of the rotating drum 3 over an angular range of 180° or more.

The rotating heads are attached to the rotating drum 3 with a phase difference of 180 degrees from each other, and as shown in the figure, they are attached at the same height in the direction of the rotation axis, and have mutually different azimuth angles. Head HA.

As is well known, the HB records and reproduces one field's worth of video signals during a 180° rotation.

In this type of VTR, the length of the track on which the video signal for one field is recorded is predetermined in the standard. Therefore, the diameter of the rotating drum 3 is inevitably determined accordingly. Therefore, the diameter of the drum 3 cannot be reduced, which hinders the miniaturization of VTRs.

Therefore, the following VTRs have been proposed as VTRs whose drum diameter can be reduced. Figures 7 (A) and (B) show a conventional VTR using a small diameter drum.
FIG. In the figure, Ha and Hb are rotary heads having different azimuth angles, and rotate once during one field period of the video signal. Rotating head Ha,
The Hb's are arranged to rotate close to each other with a small phase difference of θ°, and are mounted at the same height in the direction of the rotation axis as shown in the figure.

The tape 1 is wound around a drum 3 over an angular range of 300'' or more, and is wound around a rotating head Ha.

Each Hb records a video signal for one field while rotating by 300 degrees. That is, the video signal for one field is recorded in a period shorter than the original period of one field of the video signal.

Therefore, the video signal recorded by this type of VTR is N.
When assuming a TSC signal, instead of a normal NTSC signal, that is, a signal with a vertical scanning frequency (fv) of 60 Hz and a horizontal scanning frequency (fh) of 15.75 kHz, an fv of 6
0Hz% fh is 18.9 (15,75x 6/5)
Must be of kHz.

In other words, the video signal recorded by this type of VTR must be a normal television signal compressed in time axis to 5/6 in units of one field, or a signal obtained from a dedicated video camera.

The dedicated video camera mentioned above scans a screen with an aspect ratio of 9:1O (indicated by the dotted line Y in Figure 8), and uses the screen with an aspect ratio of 3:4 as shown by the solid line X in Figure 8 as the effective screen. It is output within the 5/6 field period. The above-mentioned FIG. 7(A).

The heads Ha and Hb shown in (B) are 5/67 E.
Since one track can be formed within the lead period, one field of video signal can be recorded on one track, and the format is the same as that of a VTR with the head arrangement shown in Figures 6(A) and (B). It is now possible to record video signals. That is, if a video signal is recorded as described above using a VTR with a head arrangement as shown in FIG.
It can be downsized by 315 mm compared to the VTR with the head arrangement shown in the figure.

Furthermore, if the reproduced video signal is time-extended by 615 times per field, the VTR having the head arrangement shown in FIG. 7 can perform the same operation as the VTR having the head arrangement shown in FIG. 6.

[Problems to be Solved by the Invention] Generally, when dubbing a tape using two VTRs, for example, when dubbing two hours of video information, it takes two hours to transfer the standard television signal. The real-time dubbing that performs this is boat fishing.

Now that camera-integrated VTRs are becoming more popular, and many people want simple editing and dubbing, it is extremely troublesome for users who are familiar with high-speed dubbing with tape recorders to perform such real-time dubbing. . for example,
It takes a lot of time and effort to delete just a small part of a two-hour video.

However, when trying to achieve high-speed dubbing,
In such a rotary head type device, the speed of the rotary head and the frequency of the recording/reproducing signal have already been set very high, making it difficult to realize high-speed dubbing. In particular, when dubbing is performed on a VTR that uses a small drum as shown in FIG. The format of the standard television signal requires various processing such as re-compressing the time axis in units of one field, which poses an obstacle to realizing high-speed dubbing. Furthermore, VTRs that can set a plurality of track pitches have become commonplace, and this has also been a major obstacle to realizing high-speed dubbing.

In view of the above-mentioned background, the present invention is small-sized, and
It is an object of the present invention to enable high-speed dubbing of tape-shaped recording media on which tracks are formed at any track pitch using a rotary head type device with a simple configuration.

[Means for Solving the Problems] With this object in mind, according to the present invention, information signals for a desired period of time are recorded, and a large number of tracks having different azimuth angles between adjacent tracks are arranged at any one of a plurality of track pitches. In a dubbing system for duplicating a tape-shaped recording medium formed by a reproducing device that reproduces information signals on N adjacent tracks on a first tape-shaped recording medium as N-channel signals; a recording device that records the reproduced N-channel signals on the second tape-shaped recording medium while forming N adjacent tracks using N rotary heads, the recording device In the reproducing apparatus, the shift amount in the rotational axis direction of the adjacent heads among the N rotary heads can be selectively set to a plurality of shift amounts corresponding to the plurality of track pitches.

[Function] As mentioned above, by using N rotating heads that have different azimuth angles and rotate closely, the rotational speed of the rotating heads can be increased and the diameter of the tram on which the rotating heads are held can be increased. There's nothing to make it bigger. Furthermore, since the amount of shift in the direction of the rotation axis of adjacent heads among the N rotary heads can be set in accordance with various track pitches, it has become possible to correspond to any track pitch. With these configurations, it has become possible to perform dubbing on a tape-shaped recording medium at a speed N times higher, even if a large number of tracks with different azimuth angles between adjacent tracks are formed at any track pitch.

[Example] Hereinafter, a dubbing system according to an example of the present invention will be described in detail.

FIG. 1(A) is a diagram showing a schematic configuration of a dubbing system as an embodiment of the present invention, and FIG. 1(B) shows a tracking control signal generation circuit (ATF circuit) in FIG. 1(A). FIG. 2 is a diagram illustrating a specific configuration example. Also, Figure 2 shows the first
FIG. 2 is a diagram showing head configurations of a reproducing side VTR and a recording side VTR of the system shown in the figure.

The head configurations of the reproduction side and recording side VTRs in the system of this embodiment are shown in FIGS. 7(A) and 7(B), and the heads Ha and Hb respectively displace these in the direction of the rotation axis. The difference is that they are placed on electrostrictive elements 61a and 61b, which serve as actuators for.

In FIG. 1(A), P is a playback VTR, and R is a recording VTR. For the sake of simplicity, only the parts related to playback and recording functions are disclosed, but both VTRs have recording and playback functions. It can also be a configuration.

40 and 41 are magnetic tapes whose recording format is the same as that of the VTR having the head configuration shown in FIG. 6 described above.

First, the normal playback operation of the playback VTR shown in FIG. 1 will be explained. When the playback track pitch is designated and a normal playback command is issued from the operation unit 34, the system controller 35 causes the servo circuit 17 to control the capstan motor 4.
2, and the tape 1 is conveyed by a capstan C by one track pitch of a specified track pitch per field period.

Now, assuming that there is a first track pitch corresponding to so-called standard mode recording and a second track pitch corresponding to long-time mode recording, the transport speed of the tape 40 by the capstan C is 1. The field period corresponds to the first track pitch or the second track pitch.

On the other hand, the system controller 35 uses the servo circuit 17 to control the drum motor 43 so that the drum D rotates once per field period. At this time, the actuators 61a and 61b are moved so that the heads Ha and Hb rotate at positions shifted by the specified track pitch in the rotation axis direction.
and is controlled by a servo circuit 17. As a result, each of the heads Ha and Hb sequentially traces each track one track at a time.

Here, the track T with the azimuth angle corresponding to the head Ha
During one field period in which the head Ha traces the track Tb at the azimuth angle corresponding to the head Hb.
This means that head Hb is tracing the signal, and during this period heads Ha and Hb can take out reproduced signals.

On the other hand, in the next one field period following this one field period, the head Ha traces the track Tb, and the head Hb traces the track Ta, making it impossible to extract the reproduced signal.

FIG. 3 is a timing chart for explaining the operation of each part of the dubbing system of this embodiment. In the figure, A...
B, , A, . . . indicate video signals for one field.KigoriThe video signal as shown in FIG. 3(a) is the same as that shown in FIG.
e), (d) &: Reproduced as shown. In addition, in the VTR with the head arrangement shown in FIG. 7 mentioned above, the head arrangement shown in FIG.
) is obtained.

The reproduced signal from the head Hb is delayed by one field period in the one-field delay circuit 18, and is input to the switch 11 together with the reproduced signal from the head Ha. The switch 11 is connected to the head Ha side during one field period in which the heads Ha and Hb can reproduce signals, and is connected to the delay circuit 18 side during one field period adjacent thereto.

As a result, the output signal of the switch 11 becomes a signal obtained by simply compressing the time axis of each field signal to 5/6, as shown in FIG. 3(b).

FIG. 4 is a diagram for explaining signals reproduced by the VTR of the system of this embodiment. FIG. 4(a) shows the spectrum arrangement of the signal recorded and reproduced by the VTR with the head arrangement shown in FIG. 6, and FIG. 4(b') shows the spectrum arrangement of the signal recorded and reproduced by the VTR in the system of this embodiment. Showing the spectrum arrangement. In the figure, Y is an FM modulated luminance signal, and A
is an FM modulated audio signal, C is a low-frequency converted chroma signal,
As is clear from FIG. 4, where P indicates four types of pilot signals for tracking control, which will be described later, the frequency of the signal output from the switch 11 in this embodiment is the same as that of the VTR with the head arrangement shown in FIG. This is 1.2 times that of the reproduced signal, and the operating frequency of the reproduced video signal processing circuit 12 is 1.2 times that of the VTR with the head arrangement shown in FIG.

The reproduced video signal processing circuit 12 obtains a reproduced luminance signal obtained by FM demodulating the FM modulated luminance signal in the signal output from the switch 11 and frequency-converts the chroma signal converted to the low frequency band to the original band. A reproduced video signal obtained by mixing the reproduced chroma signal is output. The synchronization separation circuit 16 separates the synchronization signal from the reproduced video signal and supplies it to the servo circuit 17, which is used as a reference signal for controlling the tram motor 43 and capstan motor 42 as described above.

Here, tracking control in the playback device of this embodiment will be explained.

As shown in FIG. 1(A), only the reproduction signal of the head Ha is supplied to the ATF circuit 91;
It will be supplied to the input terminal 100 of B). terminal 1
The signal inputted to 00 is passed through a low pass filter (LPF) 1.
01, and only the pilot signal is separated. In this embodiment, as shown in FIG. 4, the frequency of the reproduced signal is 1.2 times the normal frequency. Here the normal 1
．． Four types of pilot signals (fl,
f2. f3. f4) The frequency that can extract medium and high frequency pilot signals and cut chroma signals is set to 400.
)12, and the cutoff frequency of this LPFIOl is 4.
00Hz.

Here, the pilot signal separated by this LPFIOI will be considered. As mentioned above, each head Ha sequentially traces each track one track at a time.
A track Ta having an azimuth angle corresponding to the head Ha and a track Tb having an azimuth angle corresponding to the head Hb are alternately traced. However, since the frequency of the pilot signal is sufficiently low, it is not affected by the azimuth angle. That is, the pilot signal mainly reproduced by the head Ha when tracking control is performed normally is:
For example, the switching is performed one by one every field period in the order of f1→f2→f3→f4.

Therefore, during this normal reproduction, the multiplier 103 to which the output of LPFlol is supplied is supplied with fl, f2 . f3. f40
Four types of local pilot signals may be selected and applied in the order of f 1 - f 2 - f 3 - f 4 by the switch 102 for each field. As is well known, the output of this multiplier 103 is passed through a BPF 10 which separates frequency components corresponding to the frequency difference between pilot signals of two adjacent tracks.
4a and 104b. In a conventional VTR with a head arrangement as shown in FIG. 6, the frequency difference between the pilot signals of these two adjacent tracks is generally fH (f
H is the horizontal scanning frequency) and 3fH or is it in practical use?Assuming this, the BPF104a of this example,
The passing frequencies of 104b are 1.2fH and 3.6fH.

The output signals of these BPFs 104a and 104b are inputted to amplitude detection circuits 105a and 105b, and crosstalk components from both adjacent tracks of the control target track are respectively detected. These detection circuits 105a, 105b
The output of is made into a signal indicating the amount of tracking deviation by the difference circuit 106. As is well known, the frequency components separated by the amplitude detection circuits 105a and 105b correspond to crosstalk components from adjacent tracks that are opposite to each other for each field with respect to the control target track. 108 as a signal indicating the amount of tracking deviation and its direction. This is true regardless of track pitch.

The gate circuit 109 gates only the valid period of the signal output from the switch 108, that is, the period when the head Ha is tracing on the tape 40, and outputs the above-mentioned servo signal via the terminal 110 as a tracking error detection signal (ATF signal). The signal is supplied to the circuit 17. Note that this gate circuit 109
The gate timing of the drum D and the switching timing of the switches 102 and 108 are determined by the control signal generation circuit 112 according to a rotation detection signal obtained from a detector (not shown) that detects the rotation of the drum D.
controlled by.

The servo circuit 17 controls the capstan motor 42 according to the low frequency component of this ATF signal, and controls the heads Ha and Hb.
The rotation of the capstan C is controlled so that it traces the center line of the tracks Ta and Tb. Further, the circuit 17 is
An electrostrictive element 61 composed of a bimorph plate (described later) is controlled in accordance with the high frequency component of the TF signal, so that the head follows the undulations of each track.

Returning to FIG. 1A, the reproduced video signal from the reproduced video signal processing circuit 12 can also be output from the terminal 15c. However, since this reproduced video signal is a signal in which the signal of each field is time-axis compressed to 5/6, when supplying it to an external monitor, etc., the time-axis expansion circuit 13 compresses the time axis of each field signal to 615. It is expanded and output from the terminal 14.

Note that since the audio signal is not directly related to the present invention, a description thereof will be omitted in this specification.

Next, the normal recording operation of the recording side VTR in FIG. 1 will be explained. Recording side VT in the system of this embodiment
R is assumed to be a camera-integrated VTR, and has the above-mentioned dedicated video camera (overscan camera) 31. The head configuration is the same as that of the reproducing VTR, but a "°" is added for distinction. As described above, the camera 31 outputs a video signal as shown in FIG. 3(b), and inputs it to the B terminal of the switch 22, while 32 is an external input terminal, and a continuous video signal as shown in FIG. 3(a) is inputted to the B terminal of the switch 22. The captured video signal is then manually input. The time axis compression circuit 33 compresses the time axis of this video signal to 5/6 for each field to produce a signal as shown in FIG. 3(b), which is input to the C terminal of the switch 22.

Further, the terminal 21c is a terminal for manually inputting a video signal as shown in FIG. 3(b), and the video signal inputted to the terminal 21c is supplied as is to the A terminal of the switch 22.

When the normal recording mode is selected by the operation unit 36, the track pitch to be recorded is specified, and the switch 22 is instructed as to which human input signal to record, the switch 22 records the selected signal to the video signal processing circuit 23. and is supplied to the synchronous separation circuit 24.

The servo circuit 26 receives information supplied from the system controller 37 according to the operation of the operation unit 36, and the synchronization separation circuit 2.
Using the synchronization signal separated at 4, the capstan motor 4
4, the tape 41 is conveyed one track at a time with a specified track pitch per field period by the capstan C°, and the drum motor 45 is controlled in a line such that the tram D° rotates once per field period. .

The recording video signal processing circuit 23 performs FM modulation on the luminance signal, converts the chroma (No. 8 subcarrier frequency) to a low frequency signal, and supplies the signal as shown in FIG. 4(b) to the switch 25.

The switch 25 is alternately connected to the head Ha' side and the head Hb' side for each field. As a result, the signal supplied to the head Ha'Hb' is as shown in FIG. 3(c), (
d).

92 is 4 which generates a pilot signal for tracking control.
This is an f generation circuit and can generate two systems of pilot signals simultaneously. During normal recording, every one field period,
That is, the head Ha'Hb' generates a pilot signal only for the field in which the video signal is recorded, and the adder 94 generates a pilot signal.
fl for a.

f3, and f2.f3 to the adder 94b. f4 is alternately supplied every two field periods.

The rotational positions of the rotating heads Ha' and Hb' are determined by the electrostrictive elements 61a' and 61b' so that they are mutually shifted in the direction of the rotation axis by one track of the designated track pitch. This electrostrictive element 61a61b° is the servo circuit 2
6. Also, head Ha' is head Hb
The tape 41 is traced slightly ahead of '.

As a result, the heads Ha' and Hb are adjusted once every two fields.
Two tracks are simultaneously formed at the track pitch specified by ', and as a result, recording similar to that of a VTR whose head arrangement is shown in FIGS. 6 and 7 becomes possible.

The signal pressed by the switch 22 scans the monitor screen from the top edge to the bottom edge at a period of one field period and within a 5/6th field period, and the horizontal scanning frequency is set to the normal 576. (overscan monitor) 4
9, and the recording state is monitored. This monitor 4
Reference numeral 9 is used as a so-called electronic viewfinder in a camera-integrated VTR. In addition, a time axis expansion circuit 16 is provided that expands the time axis of each field signal to 615 so that it can be monitored on an external monitor.The output of this time axis expansion circuit 16 is shown in FIG. 3(a). The signal is outputted from the terminal 17 as a normal video signal.

Next, the operation during dubbing using the above-mentioned VTR on the reproduction side and recording side will be explained.

Output terminals 15a and 15b of the reproduction side VTR and the recording side VTR
The input terminals 21a and 21b of the VTR are connected, the dubbing mode is specified using the operation section 34 of the playback side VTR and the operation section 36 of the recording side VTR, and the track pitch and the tape on the tape 40 to be played are specified using each operation section 34 and 36. When the track pitch to be recorded on 41 is specified, the servo circuit 17.26
controls the capstan motors 42 and 44, and causes the capstans c and c' to transport the tape 40 and 41 by two tracks of the track pitch designated by the color in one field period, and then the tram motors 44 and 45 are moved. Control is performed so that the drums D and D" rotate once per field period.

At this time, the rotary heads Ha and Hb are shifted in the direction of the rotary axis by the specified track pitch, as in normal playback.
The playback heads Ha and Hb each read tape 4 every track.
0 will be traced, and the playback heads Ha, Hb
will trace only tracks Ta and Tb, respectively.

However, since the transport speed of the tape 40 is different from that during normal playback described above, the heads Ha and Hb cannot trace parallel to the tracks. This will be explained using FIG. 5. In FIG. 5, 100 is a vector corresponding to the running of the tape 40 during normal playback. is a vector corresponding to the rotation of the playback heads Ha and Hb; is their composite vector. During dubbing, the vector corresponding to the running of the tape 40 is 2τ1, and the composite vector is M. In order to match this vector τ to 100, in this embodiment, the vector τ. A motion corresponding to this is given by electrostrictive elements 61a and 61b composed of bimorph plates. That is, head H
During the 5/6 field period in which a and Hb are tracing on the tape 40, the electrostrictive elements 61a and 61b are connected to the head Ha.
, Hb are continuously shifted in the direction of the rotation axis by one track of the designated track pitch, and the resetting operation is repeated for each field during the remaining 1/6 field.

This operation is provided by servo circuit 17. As a result, the heads Ha and Hb trace in a direction parallel to the track.

Here, depending on the specified track pitch, vector 2
Since U, are different, the vector τ. It is easy to understand that the vector 1c is different from the vector 1c. That is, the electrostrictive element 61a,
The amplitude of the voltage applied to 61b varies depending on the designated track pitch, and the voltage difference has a constant value determined according to the designated track pitch. In FIG. 2(B), 61a and 61b are bimorph plates, and 62a.

62b is a terminal to which a control signal from the servo circuit 17 is applied, and 63a and 63b are sensors such as strain gauges. The sensors 63a and 63b are capable of detecting the absolute positions of the heads Ha and Hb in the rotation axis direction, and are provided to accurately determine the positions of the heads Ha and Hb during normal recording and reproduction. The output of the sensor 63 is fed back to the servo circuit 17.

Here, the tracking control operation during dubbing will be explained.

The ATF circuit 91 is supplied with only the reproduction signal of the head Ha as in normal reproduction. Here, the LP of FIG. 1(B)
Considering the pilot signal supplied to the FIOI, since the head Ha reproduces only the track Ta, the pilot signal fl is generated every field period as shown in FIG. 3(h).

f3 will be mainly played. Therefore, switch 10
2 is also fl as a local pilot signal.

If f3 is output alternately every field period, an ATF signal will be obtained in the following circuit. However, in this case, the amplitude detection circuit 105a.

Switch 108 is fixed because the frequency components that 105b separates are always from adjacent tracks in the same direction. The operation of the gate circuit is the same as during normal reproduction. In this way, the ATF circuit 91 outputs AT
The F signal will be supplied to the servo circuit 17.

The servo circuit 17 controls the capstan motor 42 according to the low frequency component of the ATF signal, and controls the electrostrictive elements 61a and 61b according to the high frequency component, as in the case of normal reproduction.

The reproduction signals of the heads Ha and Hb during this dubbing are shown in FIGS. 3(e) and 3(f). This signal is the reproduction amplifier 4
It is supplied to output terminals 15a, 15b via 6a, 46b.

The recording side VTR receives the information from the reproduction side VTR as shown in Fig. 3(e), (
A signal as shown in f) is sent to the terminal 21a.

21b, and is supplied to bypass filters (HPF) 93a, 93b via amplifiers 47a, 4b. HP
F93a and F93b remove the reproduced pilot signal component and output only the video signal component and audio signal component shown in FIG. 4(b).

The pressure signals of the HPFs 93a and 93b are supplied to N adders 94a and 9.
4b, and a pilot signal generated by the 4f generation circuit 92 is added thereto. During dubbing, the 4f generation circuit 92 sends fl to the adder 94a.

f3, f2. f4 is alternately supplied every one field period. The output signals of the adders 94a94b are supplied to the heads Ha' and Hb', respectively. Heads Ha' and Hb' are electrostrictive elements 61a' and Blb'
With this, the tape 4 is secured with a predetermined amount of positional deviation in the rotational axis direction according to the track pitch specified on the recording side.
0 during the 5/6 felt period, the operation is performed for each field to shift in the direction of the rotation axis by one track of the specified track pitch, and to reset during the remaining 1/6 felt period. Get back on track. The electrostrictive elements 61a' and 61b' are controlled by a servo circuit 26.

As a result, the heads Ha and Hb' trace on the tape 41 in the same direction as during normal recording.
A video signal for two fields and a pilot signal for tracking control are simultaneously recorded on adjacent tracks having different azimuth angles. This operation is performed every one field period. This realizes dubbing at twice the speed of normal recording and reproducing operations.

According to the dubbing system of the embodiment described above, the drum diameter is small and a type of VTR that multiplexes pilot signals for tracking control is used, without increasing the number of heads, and with simple installation of dubbing terminals and amplifiers. By simply adding a circuit, it became possible to perform high-speed dubbing at twice the normal speed.

Furthermore, since the shift amount of the two heads in the rotational axis direction can be determined according to the track pitch using an actuator such as a bimorph plate, high-speed dubbing is possible at any track pitch. In addition, the presence of this actuator allows VTRs to perform normal recording and playback.
In addition, it is possible to achieve good tracking that follows the undulations of the track during playback or dubbing, so the system can be used efficiently.

In the above-described embodiment, the number of heads rotating close to each other is defined as two, or depending on the desired dubbing speed, the number of heads is generally set to N.
(N is an integer of 2 or more). Tatashi,
Assuming a format for azimuth recording, and when dubbing is performed with the head arrangement as in the above embodiment, the number of heads must be an even number.

In addition, in this specification, the dubbing system was constructed assuming a VTR using a small drum, but the present invention can be applied to any rotary head type information recording/reproducing device such as a DAT (digital audio recorder). The embodiments can be modified as appropriate within the scope of the claims.

[Effects of the Invention] As explained above, according to the dubbing system of the present invention, tape-shaped recordings recorded at any track pitch can be performed using a rotary head type device of type 1 and simple configuration. It has become possible to realize high-speed dubbing of media as well.

[Brief explanation of the drawing]

FIG. 1(A) is a diagram showing a schematic configuration of a dubbing system as an embodiment of the present invention, FIG. 1(B) is a diagram showing a specific configuration example of the ATF circuit in FIG. 1(A), Figure 2 is a diagram showing the head arrangement in the VTR of the system in Figure 1, Figure 3 is a timing chart showing the signal processing timing of each part in the system in Figure 1, and Figure 4 is handled in the system in Figure 1. Figure 5 is a diagram for explaining the video signal. Figure 5 is a diagram for explaining the head trace trajectory during normal recording and playback and dubbing in the VTR of the system in Figure 1. Figures 6 (A) and (B) are Figures 7(A) and 7(B) show the head arrangement of a conventional general VTR.
FIG. 8 is a diagram for explaining a video camera used exclusively in a VTR whose head arrangement is shown in FIG. 7. In the figure, Ha, Hb, Ha', Hb' are rotary spatulas 1-1c, c' are capstans, D and D' are drums, 17.26 are servo circuits, and 18.19 are 1 field. Delay circuit, 42.44 are capstan motors, 40.41 are magnetic tapes, 46a, 46.
b are playback amplifiers, 47a and 47b are recording amplifiers, 618, 61b, 61a and 61b' are electrostrictive elements as actuators, 91 is an ATF circuit, and 92
is a 4f generation circuit, 93a and 93b are bypass filters, and 94a and 94b are adders. Figure 6 CB) tmy'

Claims (2)

[Claims] (1) A dubbing system that copies a tape-shaped recording medium in which a number of tracks are formed at any of a plurality of track pitches, each recording a predetermined period of information signals, and adjacent tracks having different azimuth angles. Using N rotating heads (N is an integer of 2 or more) that have different azimuth angles between adjacent heads and rotate closely,
A reproducing device that reproduces information signals on N adjacent tracks on a first tape-shaped recording medium as N-channel signals; a recording device for recording the reproduced N-channel signals on the second tape-shaped recording medium while forming N adjacent tracks using a rotating head; A dubbing system characterized in that the shift amount in the rotation axis direction of an adjacent head among the N rotary heads can be selectively set to a plurality of shift amounts corresponding to the plurality of track pitches. . (2) In the reproducing device, the N rotary heads reproduce the information signals on the N tracks in a period shorter than the predetermined period, and in the recording device, the N rotary heads 2. The dubbing system according to claim 1, wherein the N tracks are formed in a period shorter than a period of time.