JP3444195B2 - Recording device, reproducing device and recording / reproducing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique of a magnetic recording / reproducing apparatus, and more particularly to a technique for realizing a long-time recording / reproducing system.

[0002]

2. Description of the Related Art Conventionally, for example, in a VHS standard magnetic recording / reproducing apparatus (VTR), a magnetic tape and a head for video and audio are run relatively at a speed of 1/3 of a standard tape running speed for recording. The long-time recording mode of the triple mode has been realized. These techniques are described in, for example, JP-A-59-124004. Further, as a means for inputting various data such as video and audio using a control signal on a magnetic tape, there is a technique described in, for example, Japanese Patent Laid-Open No. 62-33388. As for the high-speed fast-forward / rewind technology, for example, there is a technology described in Japanese Patent Publication No. 1-217752.

Further, Japanese Patent Publication No. 2-63242 discloses that
In order to improve the SN ratio of voice, a magnetic recording / reproducing apparatus of a helical scan type is described in which a video head is moved so as to overlap a track on a magnetic tape on which the voice head is running to record and reproduce voice and video. In particular, a pair of first video heads for the tape running speed in the standard mode, a pair of second video heads for the tape running speed in the triple mode, which is a nominal 1/3 of the standard mode, and a pair of audios. An azimuth is formed by arranging the heads and the heads in pairs substantially symmetrically with respect to the rotation axis of the rotating body, and inclining the gap surface of each head with respect to a plane perpendicular to the head traveling direction. Forming the angles in different directions,
In addition, by making the absolute values of the azimuth angle of the audio head different from the absolute values of the azimuth angles of the first and second video heads, it is described that the recording and reproducing of the audio in the standard mode and the triple mode are realized by the same audio head. ing.

Further, the demand for long-time recording is not limited to three times, and further realization of long-time recording is desired, and Japanese Patent Laid-Open No. 5-266443 proposes a long-time recording method of six times. Has been done.

[0005]

However, there is a need for a rational system that maintains compatibility with the conventional standard mode and can realize long-time recording of an arbitrary multiple.

An object of the present invention is to realize a long-time recording mode at an arbitrary magnification while maintaining compatibility with existing systems.

Specifically, in realizing the long-time recording mode, the structure of the rotary head for audio and video, automatic tracking control, control at high speed fast forward / rewind, etc. are made rational. This is an issue.

[0008]

In order to solve the above-mentioned problems, the present invention relates to a heli-cal scan type recording apparatus, wherein the running speed of the magnetic tape is a standard speed,
A first video head for recording a video signal on the magnetic tape, and the running speed of the magnetic tape is about 1 / the standard speed.
And a second video head for recording a video signal on the magnetic tape, the second video head comprising:
The running speed of the magnetic tape is about 1/3 of the standard speed
In this case, the video signal is recorded .

[0009]

The head width of the second video head is such that the running speed of the magnetic tape is about 1 / the standard speed.
It can be said to the track pitch and equal correct ones of the video signals recorded on the magnetic tape in the case of 3.

[0011]

In order to solve the above problems, the present invention
Is a helical scan type recording device,
First and second video heads for recording signal on magnetic tape
And the first video head is projected at a standard track pitch.
An image signal is recorded, and the second video head is used for the standard image recording.
Video signals are recorded at about 1/3 and 1/5 of the rack pitch
Controlling the first and second video heads for recording
And a control means for

[0013] In this case, head width of the second video head, about 1/3 of the track pitch of the standard
It can be an equal correct ones.

Further, in order to solve the above-mentioned problems, the present invention is a helical scan type recording apparatus in which first and second video heads for recording video signals on a magnetic tape and audio signals on a magnetic tape. An audio head for recording, a first recording mode for recording a video signal and an audio signal at a standard track pitch by the first video head and the audio head, and the standard by the second video head and the audio head. Switching means for switching between a second recording mode for recording a video signal and an audio signal at about ⅕ of the track pitch, and the second video head and the audio head.
With the video signal at about 1/3 of the standard track pitch
A third recording mode for recording an audio signal is provided, and the switching is performed.
Means for recording the first recording mode and the second recording mode.
Mode, and the third recording mode is switched .

Further , the recording device is a VHS standard video device.
It is characterized by being an tape recorder.

The first video head and the second video head
Each of the video heads includes a pair of heads.
The azimuth angles of the heads of the
It is characterized by being made.

[0017]

[0018]

[0019]

[0020]

[0021]

[0022]

[0023]

[0024]

[0025]

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. With reference to FIGS.
A first embodiment of the present invention will be described. FIG. 1 is a layout diagram of a video head and an audio head on a rotary drum, FIG. 2 is a layout diagram showing steps in the mounting height direction of each head shown in FIG. 1, and FIG. 3 is a magnetic tape and a video head in a standard mode. And FIG. 4 is a schematic diagram showing the relative positional relationship between the audio head and FIG. 4, and FIG. 4 is a schematic diagram showing the relative positional relationship between the magnetic tape and the video head and audio head in the 6 × mode. In the drawings, the same components are designated by the same reference numerals.

As shown in FIG. 1, a pair of video heads 2 and 3 for standard video recording / playback (standard mode) facing the rotating surface of the rotary drum 1 and a 6 × video recording / playback (6 × mode).
And a pair of audio heads 6 and 7 for recording and reproducing audio are arranged. The pair of image heads 2 and 3 are arranged on the rotary drum 1 with a space of approximately 180 degrees, and their azimuth angles (angles formed by the gap facing surface and the vertical surface in the head rotating direction) are different from each other. It is formed to incline in the direction. Similarly, the pair of video heads 4 and 5 and the pair of audio heads 6 and 7 are also arranged on the rotary drum 1 with an interval of about 180 degrees, and their azimuth angles are inclined in directions different from each other. Has been formed. Video heads 2 and 5, and 3 and 4
The two are formed so that the inclinations of the azimuth angles are opposite to each other and are arranged close to each other. The interval between the two is normally set to Th (Th is usually set to 1 or 2) times the cycle of the horizontal synchronizing signal of the video signal recorded on the tape. Also, the audio head 6 (or 7) and the video head 3,
4 (or 2, 5) are arranged with an interval of 120 degrees.

The rotating direction of the rotary drum 1 is left as shown by the arrow. The azimuth angle of each head is, for example, about +6 degrees for the video heads 2 and 4, about -6 degrees for the video heads 3 and 5, about +30 degrees for the audio head 6, and about -30 degrees for the audio head 7. Has been done. As a result, azimuth loss is utilized to reduce crosstalk between audio and video signals that occurs between adjacent tracks and the same track. The head widths of the video heads 2, 3, 4, 5 and the audio heads 6, 7 and the height position of the mounting surface (the axial position of the rotary drum) are set as shown in FIG. In FIG. 2, the diagonal lines attached to the heads indicate the relationship between the tilt directions of the azimuth angles.

Here, FIGS. 3 and 4 show track patterns of the audio track 9 and the video track 10 when recording on the magnetic tape 8 using the rotary head having the arrangement shown in FIGS. FIG. 3 shows the relative positional relationship between the magnetic tape 8, the video head 3 and the audio head 6 in the standard mode. The tape speed is controlled so that each track pitch is about 60 μm according to the head width of the video heads 2 and 3 in the standard mode. As a result, the voice head 6
The audio track 9 having the same width as the head width of the magnetic tape 8
Formed on. In the present embodiment, the head width of the audio head 6 is formed to be about 28 μm. On the audio track 9 thus recorded, a video track 10 having the same width as the head width of the video head 3 is formed by overwriting with a rotation phase delay of 120 degrees.

By the way, since the video head 3 has a phase delay of 120 degrees from the audio head 6, if the height positions of the video head 3 and the audio head 6 on the rotary drum 1 are the same, the video head 3 leads. By the time it comes to the same position on the magnetic tape as the voice head 6, the magnetic tape has advanced by (120 degrees / 180 degrees) of the track pitch (about 60 μm). Therefore, the preceding portion 40 μm (= 60
.mu.m.times.120 / 180) +. alpha., the head difference between the two is set to about 58 .mu.m as shown in FIG. 2 so that the video track 10 is overwritten on the audio track 9. Here, + α is a value for setting the audio track 9 near the center of the video track 10 as shown in FIG. As a result, the audio track 9 and the video track 10
The overlapping portion has a width of about 28 μm. This overlap is
Since the azimuth polarities of both heads are different,
Interference between the two signals is not a problem. Generally, an audio signal is recorded as a relatively low frequency modulation signal to the deep layer portion of the magnetic tape 8, and a video signal is recorded as a relatively high frequency modulation signal on the surface layer portion of the magnetic tape 8, and at that time, it is recorded first. It is overwritten while erasing the modulated signal of the audio signal.

FIG. 4 shows the relative positional relationship between the magnetic tape 8, the video head 4 and the audio head 6 in the 6 × mode. The tape speed is controlled so that each track pitch 9 and 10 is formed at about 10 μm. The head width of the audio head 6 is about 28 μm as in FIG. 3, and the audio track 9 is formed on the magnetic tape 8. The video head 4 overwrites the video track 10 on the rotary drum 1 with a delay of 120 degrees. Due to this rotation phase delay of 120 degrees, the magnetic tape 8 travels by (120 degrees / 180 degrees) of the track pitch (about 10 μm). In order to compensate the deviation, about 7 μm (= 10 μm × 120
/ 180), the head step difference between both heads may be set to about 7 μm, but in the present embodiment, it is set to about 49 μm as shown in FIG. 2 for the reason described later. As a result, the overlap between the audio track 9 and the video track 10 is about 8 μm, as shown in FIG. 4, and the overlapping parts have the same azimuth polarity. However, the azimuth angle is different as described above (6 degrees and 30 degrees).
Since the azimuth loss is sufficiently formed, the interference between the two signals is sufficiently removed.
Further, it can be said that the head width of the video head 4 is about 20 μm, which is sufficiently wide for a track pitch of about 10 μm. As a result, it is possible to allow the track to bend and to obtain sufficient tracking performance.

Next, the control at the recording end point, which is necessary when recording in the 6 × mode using the audio heads 6 and 7 and the video heads 4 and 5 shown in FIG. 2, will be described.
Will be described in detail with reference to FIG. In those figures,
The same parts as those in FIGS. 1 to 4 are designated by the same reference numerals and the description thereof will be omitted. FIG. 6 is a block diagram showing the main part of the recording control means in the 6 × mode. The audio recording signal input from the input terminal 11 is amplified by the audio recording amplifier 12 and is switched and supplied to the audio heads 6 and 7, whereby the audio recording signal input is alternately recorded on the adjacent audio tracks 9. It On the other hand, the video recording signal input from the input terminal 13 is amplified by the video recording amplifier 14 and switched and supplied to the video heads 4 and 5, whereby the video recording signal input is alternately recorded on the adjacent video tracks. To be done. The timing control circuit 15 generates a mute signal to be supplied to the video recording amplifier 12 and the audio recording amplifier 14.

Now, the arrangement of the horizontal synchronizing signals on the magnetic tape recorded as described above will be described. As an example of the horizontal synchronizing signal in the case of the VHS standard system, the case of the triple mode is shown in FIG. 18, and the case of the sixth mode is shown in FIG. V
According to the HS standard, as shown in FIG. 18, the amount of deviation (αH) of the horizontal synchronizing signal (H) between adjacent tracks during the 3 × mode recording.
Is set to 0.5H. Therefore, when one field (262.5H) is recorded on one track, the arrangement of the horizontal synchronizing signals (H) is neatly matched between the recording tracks.

However, in the example of the 6 × mode to which this embodiment is applied, the shift amount αH is 0.25H as shown in FIG.
And the horizontal synchronization signal (H) between each recording track.
Will be disturbed. When the magnetic tape recorded in this way is reproduced by the head 4 having a width wider than the recording track shown in FIG. 19, a problem that a signal leaks from both adjacent tracks is likely to occur. Basically, since adjacent tracks are recorded by heads with different azimuth angles, adjacent components are considerably reduced and reproduced due to the azimuth effect, but low-frequency conversion color signals and luminance where the azimuth effect cannot be obtained. The horizontal sync signal part of the signal, which is a relatively low frequency component,
In particular, the leakage image quality is adversely affected. An example of the image monitor at this time is shown in FIG. As shown in FIG. 19, the horizontal sync signal portions leaking from both adjacent sides are 0.
Since the shift is 25 H, the image quality is deteriorated as two adjacent vertical interference signals on the screen as shown in FIG.

As an example of such a measure for reducing the adjacent interfering signal, FIG. 21 shows a case where the 5 times mode is set. By recording in the 5x mode, the influence from both sides is significantly improved compared to the 6x mode. That is, in the 6 × mode, the main track is 10 μm, and the adjacent track is 5 μm.
m was detected (ratio; 5/10 = 0.
5) In the 5 × mode, the detection is 4 μm from both adjacent tracks with respect to the main track 12 μm (ratio: 4/12
= 0.33). Further, in this description, an example in which the tracking is controlled so that the same track is detected on the left and right adjacent tracks is explained. However, it is better to reproduce while maintaining the same positional relationship as originally recorded. It can be said that it can meet the same conditions as above and is strong against mechanical disturbance factors. Even in such a case, in the 6 × mode, since the head end contacts the same azimuth angle track of the adjacent tracks, the adjacent interference that further deteriorates the image quality can be considered. 5 from this point
Double mode is more effective. Further, it is needless to say that it has a plurality of modes such as the 5x or 6x mode described in the present embodiment for a longer time than the conventional 3x mode, and can be switched and used as necessary.

Further, as a positive solution to the disturbance due to the horizontal sync signal of the adjacent track, FIG. 22 and FIG.
Fig. 7 shows a method of realizing the arrangement of the horizontal synchronizing signals when recording in the 6x mode. FIG. 23 shows a specific circuit example of the video recording amplifier 14 shown in FIG.
1, 72, 73, SW circuit 74, recording amplifier 75, SW
The circuit 76 and the delay control circuit 77 are included.
With this circuit, by switching the delay time for each recording track in units of 0.25H as shown in FIG. 22, it is possible to secure the arrangement of the horizontal synchronization signals of each recording track. That is, at each recording track, t ₂ = 0.5H, t ₁
By repeating the four modes of = 0.25H, t ₀ = 0H, t ₃ = 0.75H, the horizontal synchronization signals of all recording tracks can be aligned. Although this example describes the 6 × mode, the present invention is not limited to this, and the same can be applied to the 5 × mode.

By doing so, the positions of the interfering signals from the adjacent and adjacent tracks are substantially the same as the position of the horizontal synchronizing signal which cannot be seen on the screen monitor. This control is performed by the delay control circuit 77 in the video recording amplifier 14 shown in FIG.
Then, the output pattern of the four modes is supplied to the SW circuit 74 in accordance with the signal from the timing control circuit, and 0.25
22. By selecting the optimum signal from the input / output of the H delay circuits 71 to 73 and supplying it to the heads 4 and 5 via the recording amplifier 75 and the SW circuit 76, the signal shown in FIG.
It is possible to record the horizontal synchronizing signals as shown in FIG.

Next, the reproducing operation for reproducing the 6 × mode recording signal recorded as described above will be described.
FIG. 7 shows the relationship between the relative positions of the magnetic tape 8 and the video head 4 and the audio head 6 during reproduction in the 6 × mode. The basic relative relationship is the same as that at the time of recording shown in FIG. 5, but in order to realize the optimum tracking, the phases of both are matched as shown in FIG. That is, the voice head 6
Adjusts the tracking so that the audio track 9 to be reproduced is located substantially at the center position of the head width. As a result, the audio tracks on both sides adjacent to the audio track to be reproduced are simultaneously scanned, but since the azimuth polarities are different, there is no problem of interference, and one audio track with the same azimuth polarity is placed. Since it becomes a different audio track and is not scanned, the problem of interference can be avoided.
In order to satisfy this condition, it is preferable that the head width of the audio head 6 (or 7) be 3 times or less the track pitch in the 6 times mode. That is, the audio head width is set to 28 μm <track pitch 10 μm × 3. As a result, the signal of the adjacent track is sufficiently attenuated by the azimuth loss, and the adjacent track can be prevented from being reproduced, and the audio signal with sufficient S / N can be reproduced. Further, since the voice heads 6 and 7 are also utilized in the standard mode, it is clear that the width as wide as possible within the above range is good for improving the S / N in the standard mode.

Similarly, the head widths of the video heads 4 and 5 are the same as those of the video heads 4 and 5 in consideration of reproducing a magnetic tape recorded by another magnetic recording / reproducing apparatus (± 5.
It is preferable to set a sufficiently wide width within a range of 3 times or less of the track pitch so that (μm) can be sufficiently absorbed. However, making the head width wider than necessary leads to deterioration of S / N. Therefore, the extent of covering the track bend, for example, 20 μm (track width 10 μm + track bend 10 μm), which is about twice the track pitch, is required. Appropriate.

Here, the reason why the step difference between the audio heads 6 and 7 and the video heads 4 and 5 is set to about 49 μm will be described with reference to FIGS. 8 and 9. FIG. 8 shows the relative positional relationship between the magnetic tape 8 and the video heads 3 and 4 when the magnetic tape 8 recorded in the standard mode is reproduced at high speed (approximately three times the recording speed). FIG. 9 corresponds to FIG.
The block diagram of the reproducing means for obtaining the reproducing operation of FIG.
As shown in the figure, the video reproduction signals reproduced by the video heads 2, 3, 4, and 5 are respectively reproduced by the corresponding reproduction amplifiers 16.
Amplified by ~ 19. The reproduced signals of the video heads 3 and 4 are input to the level comparator 20 and the switch circuit 22, respectively. The reproduced signals of the video heads 2 and 5 are input to the level comparator 21 and the switch circuit 23, respectively. That is, the video heads 3 and 4 (or 2, which are provided adjacent to each other)
5) is formed so as to have different azimuth angles from each other, and therefore, when high-speed reproduction is performed, as shown in FIGS. It is desirable to consider the step difference between both video heads so that the output of No. 4 increases. 10 to 12, the output level of the video head 3 is shown by an output waveform 25, and the output level of the video head 4 is shown by an output waveform 26. By doing so, it is possible to obtain a high-speed reproduction image with less noise by selectively selecting the one with a larger output from both video heads 3 or 4 or by switching to an equal interval. For this purpose, it is desirable that the centers of the head widths of the video heads 3 and 4 (and 2, 5) are arranged substantially the same. FIG. 10 shows output waveforms 25 and 26 of the video heads 3 and 4 at this time.

On the other hand, considering at least the relative positional relationship at the time of recording in the 6 × mode shown in FIG. 4, the video head 4 (or 5) is 4 fields (corresponding to 4 tracks) to the audio head 6 (or 7). ) To 6 fields (corresponding to 6 tracks), it is necessary to arrange them at the positions for subsequent recording.
FIG. 11 shows output waveforms 25 and 2 of the video heads 3 and 4 at the time of high-speed reproduction when arranged at a position for recording 4 fields later.
6 is shown. Further, FIG. 12 shows output waveforms 25 and 26 of the video heads 3 and 4 at the time of high-speed reproduction in the case of being arranged at a position for recording 6 fields later. From these figures, it can be seen that a high-speed reproduction image with less noise can be obtained in any case.

The reproducing means shown in FIG. 9 is one example for realizing FIGS. That is, the level comparator 20 (or 21) compares the output signals of the reproduction amplifiers 16, 17 (or 18, 19) that amplify the outputs of the video heads 3, 4 (or 5, 2) arranged in close proximity. The larger one of the output signals is detected. Then, the switch circuit 22 (or 2
By selectively switching 3), the one with a larger output signal is always selected for reproduction output. The outputs of the switch circuits 22 and 23 are further selected by switching the reproduction signals of the video heads 3 and 4 or the video heads 5 and 2 by a head switching signal produced in synchronization with the rotation of the drum by the switch circuit 24. , Continuous playback signals are output.

Here, the level comparators 20 and 21 are not limited to selection by the magnitude of the output level of each reproduction amplifier, and as shown in FIGS.
It is conceivable to select such that (2 to t3), (t3 to t4), (t4 to t5) and (total of t1 to t2 and t5 to t6) are equal. This has the advantage that the video change point on the playback screen can be fixed at the same point and is easy to see. In order to realize this, the duty ratio of the outputs of the level comparators 20 and 21 may be controlled to be 50%.

Next, the reproducing operation for reproducing the recording signal recorded in the triple mode will be described. In FIG. 13, 3
Magnetic tape 8 and video head 4 during playback in double mode
And the relationship of the relative position with the voice head 6. As shown in the figure, the speed of the magnetic tape is controlled so that each track pitch is about 20 μm. The head width of the audio head 6 is about 28 μm as in the above-described embodiment, and the audio track 9 is formed on the magnetic tape 8. The video head 4 overwrites the video track 10 with a delay of 120 degrees on the rotary drum 1. Due to the delay of 120 degrees on the rotary drum 1, the magnetic tape 8 advances by (120 degrees / 180 degrees) of the track pitch (about 20 μm), and therefore the preceding portion of about 13 μm (= 20 × 120).
The image head 4 scans the position of a value (about 36 μm) obtained by subtracting / 180) from the head step difference of about 49 μm. As a result, the overlap of the same azimuth polar parts of the audio track 9 and the video track 10 is about 16 μm. Further, since the head width of the video head 4 is about 20 μm, the track pitch of about 20 μm is secured, so that recording can be performed on all tracks without generating a guard band. This relationship can be reproduced while maintaining almost the same relationship during reproduction.

Next, the operation at the time of recording / reproducing in the double mode will be described. FIG. 14 shows the relative positional relationship between the magnetic tape 8, the video head 3, and the audio head 6 in the double mode. In the figure, the same components as those shown in FIGS. 1 to 13 are designated by the same reference numerals and the description thereof will be omitted. The magnetic tape speed is controlled so that the track pitches of audio and video are about 30 μm each. The head width of the audio head 6 is about 28 μm as in the above embodiment, and the audio track 9 is formed on the magnetic tape 8. Then, the video head 3 forms the video track 10 by overwriting it with a delay of 120 degrees on the rotary drum 1. Due to the delay of 120 degrees on the rotary drum 1, the magnetic tape has a track pitch (about 30 μm) (120 degrees /
180 degrees) to move forward, so about 20μ ahead of that
The video head 3 scans at a value (about 38 μm) obtained by subtracting m (= 30 μm × 120/180) from about 58 μm of the step difference between the two heads. As a result, the overlap of the same azimuth polar parts of the audio track 9 and the video track 10 is about 22 μm. Since the head width of the voice head 6 is about 28 μm, the track pitch is about 3 μm.
A guard band of about 2 μm is generated for 0 μm. It goes without saying that this relationship can be reproduced while maintaining a substantially similar relationship even during reproduction.

As described above, with the configuration of the rotary head shown in FIGS. 1 and 2, the image heads 4 and 5 are used in the 3 × mode and the 6 × mode, and the image heads are used in the standard mode and the 2 × mode. Recording or reproduction can be realized by using the heads 2 and 3, respectively.

Next, the control means for controlling the relative speeds and phases of the magnetic tape and the audio / video head in the magnetic recording / reproducing apparatus having the recording or reproducing modes at various tape speeds of the above-mentioned embodiment will be explained. . Here, the reproduction tracking control in the 6 × mode shown in FIG. 7 will be described as an example in detail.

FIG. 15 shows a book configuration diagram of the reproduction tracking control device. In the figure, the same parts as those in FIGS. Magnetic tape 8
Runs in contact with the rotating surface of the rotary drum 1, and the rotary drum 1 is rotationally driven by a drum motor 27. Further, the magnetic tape 8 is sandwiched by a capstan 28 and a pinch roller 29, and the capstan 28 is rotationally driven by a capstan motor 30 so that the traveling speed of the magnetic tape 8 can be controlled. The audio signals reproduced by the audio heads 6 and 7 provided on the rotary drum 1 are switched by the head switch circuit 31, and the audio signals of any of the audio heads 6 and 7 are input to the preamplifier 32. There is. Preamplifier 32
The audio signal amplified by is input to the audio signal processing circuit 33 and the envelope detection circuit 34. The audio signal processing circuit 33 demodulates the modulated audio signal and performs necessary audio signal processing to restore and output the reproduced audio signal. The envelope detection circuit 34 detects the amplitude component of the audio signal and outputs it to the rotary drum / capstan control means 45.

Rotating drum / capstan control means 45
Is formed of a drum servo control circuit 35, a head switch signal (HSW) generation circuit 36, a capstan servo control circuit 39, a reference signal generator 40, a delay circuit 41, and a tracking control circuit 42. The drum servo control circuit 35 generates a signal for controlling the speed and phase of the drum motor 27 from the DFG signal and the DPG signal generated by the drum motor 27, and controls the drum motor 27 via the driver circuit 37. The head switch signal generation circuit 36 generates the switching timing of the audio heads 6 and 7 based on the DPG signal or the DFG signal standardized by the DPG signal, and controls the switching of the head switch circuit 31 based on this. The capstan servo control circuit 39 runs the tape on the basis of the recording / reproducing mode set by the mode switching means 86 and the control signal and the CFG signal reproduced by the control head 43 arranged in contact with the magnetic tape 8. A signal for controlling the speed and the phase is generated, and the capstan motor 30 is controlled via the driver circuit 38. By these, the relative positions of the magnetic tape 8 and the audio heads 6 and 7 are controlled. In the description of FIG. 15, all the electrical processing parts are expressed as circuits, but for example, the rotary drum / capstan control means 45 can be configured by software using an appropriate microcomputer.

Next, the operation of the embodiment of FIG. 15 will be described with reference to FIG.
This will be described with reference to FIG. First, the signal of the audio track 9 recorded by helical scanning on the magnetic tape 8 is generated by the two audio heads 6 and 7 arranged on the rotary drum 1.
Are reproduced by the head switch circuit 31 and are alternately selected and read by the head switch circuit 31. Further, although not shown, the video signals are similarly arranged on the rotary drum 1, and the video heads 2 and 3 are also provided.
Alternatively, it is reproduced by the video heads 4 and 5, and a continuous reproduction signal is obtained via the head switch circuit and demodulated to output a video signal.

On the other hand, the drum servo control circuit 35 uses the DF
The speed control signal is generated so as to keep the period of the G signal constant, and the DPG signal and the output signal of the reference signal generator 40 are phase-compared to each other so that the rotation phase of the drum motor 27 is synchronized. Control. The capstan servo control circuit 39 generates a speed control signal so as to keep the cycle of the CFG signal constant, and a control signal obtained from the magnetic tape 8 via the control head 43 and the reproduction amplifier 44 and a reference signal. The output signal of the generator 40 is phase-compared with the signal obtained by delaying it through the delay circuit 41, and the rotation of the capstan motor 30 is controlled so as to synchronize the phases of both. Further, the mode switching means 86 controls the capstan servo control circuit 39 to control various tape running speed modes.

Here, the tracking control using the capstan motor 30 is performed as follows. First, the envelope detection circuit 34 detects the amplitude component of the audio signal read from the magnetic tape 8. As a result, the audio signal output from the envelope detection circuit 34 is the audio track 9 and the audio head 6 formed on the magnetic tape 8.
For example, as shown in FIG. 16, depending on the relative relationship with the trace phase (travel position) of No. 7. That is, while the width of the audio track 9 is about 10 μm, the audio heads 6 and 7 are
Since the head width is about 28 μm, almost no output is reproduced on the adjacent tracks due to the azimuth effect, but the adjacent tracks are reproduced because they have the same azimuth polarity. Therefore, the center of the azimuth track having the opposite polarity is set to the voice head 6.
Alternatively, when 7 traces, a reproduction signal of a level corresponding to a width of 9 μm is detected from the azimuth tracks of the same polarity on both sides (the positional relationship of the audio head 6 shown by the dotted line in FIG. 16). However, since the signals reproduced from the respective tracks have no correlation, there is a signal component that cancels each other out, and it is lower than the signal level reproduced from the same track. As shown in the lower part of FIG. The relative output level changes as the relative phase changes. Based on these results, the optimum tracking phase is set to the delay circuit 4
Set using 1. This optimum value may be set to the center value, for example, by detecting that the output levels on both sides of the relative output level become equal as shown in FIG.

Another embodiment of the present invention will be described with reference to FIGS. The present embodiment is an example of a method of recording for a long time by not only reducing the feeding speed of the magnetic tape described above but also reducing the rotation speed of the rotary head. FIG. 24 is a diagram showing the relative positions of the recording track and the recording head on the magnetic tape during 6 × mode recording according to the present invention. FIG. 25 shows specific circuit means of the drum servo processing circuit 35 of FIG. 15 in order to explain in detail the specific circuit means for realizing FIG. As shown in FIG. 25, the drum servo processing circuit 35 includes a doubling circuit 7
8, SW circuits 79 and 80, speed detection circuit 81, phase detection circuit 82, addition circuit 83, and 6-times mode instruction input terminal 8
It is configured to include a 4 1/2 divider circuit 85.

FIG. 24 is the same as the recording pattern in the triple mode shown in FIG. However, the recorded signal is changing. That is, in the triple mode shown in FIG.
While the video signal for one field was recorded on the track, in the present example, twice the information is recorded by recording the video signal for two fields on one track. This method is realized by setting the running speed of the magnetic tape to the 6-times mode and simultaneously halving the rotating speed of the rotary head. As a result, it is possible to create a recording track pattern that is not affected by the interfering signals from the adjacent and adjacent tracks at the time of reproduction described above. Of course, it is necessary to pay attention to the decrease in the output of the high frequency component of the frequency-modulated video signal because the relative speed between the magnetic tape and the rotary head decreases, but the recent high resolution mode (S-VH in the VHS system)
Sufficient performance is being achieved for recording / reproducing in the normal mode using a magnetic tape and a head that realizes (S mode). Therefore, for example, this recording mode is S-VHS.
It is desirable to limit to the settable mode only when the cassette tape is inserted.

Next, the specific means for realizing FIG. 24 will be described in detail with reference to FIGS. 15 and 25. Since the control of the 6 × mode of the magnetic tape has already been described with reference to FIG. 15, specific circuit means for controlling the speed of the rotary head to ½ will be described with reference to FIG. 25. The figure shows the circuit configuration provided in the drum servo processing circuit 35 for controlling the rotation of the rotary head. In the long time mode (6 times) in the normal mode, the SW circuits 79 and 80 are operated by an instruction from the input terminal 84, and the DFG signal generated according to the rotation speed of the drum having the rotary head is The frequency doubled through the frequency doubler circuit 78, the speed detection circuit 81 and the addition circuit 83 through the SW circuit 79.
To control the drum motor via. Therefore, as a result, the rotary head is controlled at a speed half that of the normal mode. Further, in the phase detection circuit 82, the signal from the reference signal generator 40 is divided into 1/2 by the 1/2 divider circuit 85.
Similarly, the 1/2 speed control can be performed for the phase control by dividing the frequency into two and supplying the same through the SW circuit 80 and detecting the phase with the drum rotation phase signal DPG input.

Although not shown, the signal input to the input terminal 84 detects what kind of magnetic tape is currently inserted by the system controller, as described above, and, for example, the S-VHS tape. Only in this case, the long-time recording mode may be set. Also, in this example, it is described that two fields are recorded on one track, but it will be easily understood that a system that records three fields or more on one track can be configured.

Next, with reference to FIG. 17, a control operation for high speed fast forward / rewind of the magnetic tape 8 according to the present invention will be described. FIG. 1 is a block diagram showing a high speed fast forward / rewind control device according to an embodiment. In the figure,
The same parts as those in FIG. 16 are designated by the same reference numerals and the description thereof will be omitted. As shown, the magnetic tape 8 has two reels 46,
It is wound around 47. The reels 46 and 47 are engaged with the reel stands 48 and 49, respectively.
9 is rotationally driven by a motor 54 via a driving force transmission means 55. FG (Frequency Genera
tor) The pulse generators 50 and 51 are the reel stands 4 respectively.
The rotation speeds of 8 and 49 are detected, and pulses of a frequency proportional to those rotation speeds are output. Further, the brakes 52, 53 provided on the reel stands 48, 49 are driven by the brake drive means 66. The rotation speed of the motor 54 is detected by the FG pulse generator 56. Although not shown, the rotary drum and the capstan are both reels 4
It is provided so as to be in contact with the magnetic tape 8 which is transported between the magnetic tape 6 and the magnetic tape 47.

Here, the detailed structure of the high-speed fast-forward / rewinding control device will be described together with the operation, taking the case of running the magnetic tape 8 at a high speed of Vn as an example. The motor 54 is driven to rotate by an output signal from the motor driver 64. The driving force of the motor 54 is transmitted via the driving force transmission means 55 to the reel base 49 during fast-forwarding and to the reel base 48 during rewinding. Thus, the magnetic tape 8 is wound on the reel 47 at the time of fast-forwarding and on the reel 46 at the time of rewinding. At this time, the FG pulse oscillator 50 is used to drive the reel stand 4
8, the FG pulse oscillator 51 detects the speed of the reel base 49, and the FG pulse oscillator 56 detects the speed of the motor 54. A pulse signal having a frequency indicating the detected rotation speeds of the reel stands 48, 49 and the motor 54 is
It is input to the winding diameter detecting means 57 and the speed detecting means 58.

In the winding diameter detecting means 57, for example, the winding diameter values (radius) Rs, R of the reels 46, 47 are calculated by the following mathematical formula 1.
Find t.

[0060]

## EQU1 ## Rs = √ {S / (π (1+ (Tt / Ts) ² ))} Rt = √ {S / (π (1+ (Ts / Tt) ² ))} where S is a magnetic tape Is the total winding area of the tape including the reel hub when viewed from above, and Ts and Tt are FG, respectively.
The period of the pulse output from the pulse oscillators 50 and 51 is shown.

On the other hand, the speed detecting means 58 obtains the running speed V of the magnetic tape by the following mathematical formula 2, for example.

[0062]

[Formula 2] V = 2 · π · Rt / Tt The winding diameter value (radius) Rs detected by the winding diameter detecting means 57,
Rt is input to the speed detecting means 58 and the deceleration setting means 59. The speed data V detected by the speed detecting means 58 is input to the speed error detecting means 61 and the stop determining means 65. In the deceleration setting means 59, the winding diameter detecting means 5
The winding diameter value (radius) Rs or Rt input from 7 sets the deceleration a at which tape slack does not occur during deceleration. Here, in order to perform deceleration running without tape slack, it is necessary to set the deceleration a of the controlled tape winding side reel to be equal to or less than the deceleration due to the load torque of the uncontrolled tape supply reel. . That is, deceleration a [mm /
s ² ] is set by the following Equation 3. In Formula 3, T, R, and I are the load torque [gr / mm], the winding diameter value (radius) [mm], and the moment of inertia [gr / mm ² ] of the tape supply side reel, respectively. The load torque T and the inertia moment I need to be obtained in advance by measurement or the like. Here, the tape supply side is the reel 46 side at the time of fast-forwarding and the reel 47 side at the time of rewinding.

[0063]

## EQU00003 ## a.ltoreq.T.R / I The deceleration a set by the deceleration setting means 59 is input to the target speed switching means 60. In the target speed switching means 60, the target speed Vn is set by the speed switching signal input via the input terminal 70. The set target speed Vn is input to the speed error detecting means 61. The speed error detecting means 61 calculates an error component between the speed data V detected by the speed detecting means 58 and the target speed Vn set by the target speed switching means 60. The speed error component calculated by the speed error detecting means 61 is PW.
It is fed back to the motor 54 via the M generator 62, the integrator 63, and the motor driver 64. This causes the tape running speed V to follow the target speed Vn.

During such high-speed fast-forwarding / rewinding, control is performed to detect the cueing signal recorded on the magnetic tape 8 by duty ratio modulation, for example, and stop the magnetic tape 8 based on this signal. There is. In the figure, the control signal on the magnetic tape 8 is detected by the data detection means 67 via the control head 43. The output of this data detection means 67 is
It is input to the target speed switching means 60 and the stop determination means 65 via the adder 68. The target speed switching means 60 starts subtraction of the target speed Vn by inputting a stop signal. Here, the subtraction amount of the target speed Vn per unit time is proportional to the deceleration a input from the deceleration setting means 59. As a result, the target speed Vn changes with a slope corresponding to the deceleration a. Therefore, since the traveling speed V follows the target speed Vn, the traveling speed V is decelerated at the deceleration a. On the other hand, after the stop signal is input, in the stop determination means 65, the speed data V input from the speed detection means 58 is converted into the allowable speed VL.
When it detects that the following has occurred, it outputs a brake permission signal. The brake permission signal output from the stop determination means 65 is input to the brake drive means 66. The brake drive means 66 drives the brakes 52 and 53 in response to the brake permission signal from the stop determination means 65 to stop the tape running.

Therefore, if the target speed Vn output from the target speed switching means 60 is the speed VH exceeding the allowable speed VL, after the stop signal is input, the speed VH is changed to the speed VL.
After decelerating to, the stop determination means 65 outputs a brake permission signal to stop traveling. Here, since the deceleration also changes as the winding diameter value of the supply reel changes, the brake timing differs for each winding diameter value.

If the target speed Vn is equal to or lower than the permissible speed VL, the stop operation is stopped at the same time when the stop determination means 65 outputs the brake permission signal at the same time when the stop signal is input.

Further, by switching the output of the target speed switching means 60 in accordance with the recording mode of the magnetic tape 8 from the standard mode to the 6 × mode, the usability for each application can be improved. . That is, in the case of designating the mode in which the magnetic tape 8 is simply rewound to the beginning, the highest rewind speed may be set regardless of the recording mode. However, at the time of fast forward / rewind in the mode of detecting the cue signal superimposed on the control signal and stopping it, the frequency of the control signal reproduced from the magnetic tape 8 is recorded in the standard mode even at the same speed of the magnetic tape 8. The magnetic tape recorded in the 6 × mode is detected at a frequency 6 times higher than the recorded magnetic tape. In this case, it is possible that the frequency of the reproduction control signal becomes too high and the reproduction control signal cannot be detected. The reproduction control signal is used for information for managing the tape position by this number, and if it cannot be detected, a system inconvenience occurs. Further, even if the number of reproduction control signals can be detected, if the cue signal superimposed on the reproduction control signal cannot be detected, the system will be inconvenient.

Therefore, means for limiting the high speed fast forward / rewind speed in the 6 × mode is provided. That is, in the target speed switching means 60, the high speed fast forward / rewind speed is set by supplying the speed switching signal from the input terminal 70. As a result, in the newly provided tape recorded in the 6 × mode, even in the high-speed fast-forward / rewind mode, the cue signal superimposed on the control signal on the magnetic tape is detected and the search is stopped at the desired position. Control can be realized.

Further, the recording mode discrimination at the time of reproduction can be made by comparing the frequency of the control signal normally reproduced with the magnetic tape speed. Also, the input terminal 69
Is an input signal when the operator manually performs a stop operation. Further, the motor 54 may be the same as the capstan motor 30 shown in FIG. As explained above
The magnetic recording / reproducing apparatus according to the embodiment of the present invention
Then, the following effects can be obtained. (1) Along with the standard mode for video and audio signals,
The same recording and playback in N times (for example, 5 times or 6 times) mode
It can be realized with one voice head. (2) N-fold (example:
For example, you can share the video head for 5x or 6x mode.
It (3) When realizing recording / reproducing in double mode,
It can be realized by sharing the video head for video. (4) When playing in N times (for example, 5 times or 6 times) mode
As an optimal tracking method in
Optimal tracking of both audio and video by using
Can be used. (5) Stop recording in N times (for example, 5 times or 6 times) mode
Sometimes over at least 4 fields
Stop audio signal recording first to ensure audio
Video tracks can be overwritten on the rack. (7) High-speed fast forwarding in N times (for example, 5 times or 6 times) mode
Compare the rewind / rewind speed to the tape speed in standard mode.
And set to a low speed, and
The signal can be surely detected. (8) Recording power in N times (for example, 5 times or 6 times) mode
Align the horizontal sync signals between adjacent tracks of a turn
Allows you to see the effects of adjacent crosstalk on the screen
Can be combed.

[0070]

According to the present invention, compatibility with existing systems is achieved.
Long-term recording / playback that exceeds the 3x mode while maintaining performance
Can be realized.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of a rotary head of a magnetic recording / reproducing apparatus according to the present invention.

FIG. 2 is a diagram showing an arrangement relationship of respective heads of the rotary head shown in FIG.

FIG. 3 is a diagram showing a relative positional relationship between a magnetic tape and each head during standard mode recording.

FIG. 4 is a diagram showing a relative positional relationship between a magnetic tape and each head during recording / reproduction in a 6 × mode to which the present invention is applied.

FIG. 5 is a relative positional relationship diagram for explaining the recording stop timing of the video head and the audio head when recording is stopped in the 6 × mode to which the present invention is applied.

FIG. 6 is a control block diagram for controlling the recording stop timing of the video head and the audio head when recording is stopped in the 6 × mode.

FIG. 7 is a diagram showing a tracking phase relationship between the magnetic tape and each head during 6 × mode reproduction to which the present invention is applied.

FIG. 8 is a diagram showing a relative positional relationship between a magnetic tape and each head during search reproduction in a standard mode to which the present invention is applied.

FIG. 9 is a control block diagram of search reproduction in standard mode.

FIG. 10 is a waveform diagram showing the output levels of the video head 3 and the video head 4 during search reproduction in the standard mode.

FIG. 11 is a waveform diagram showing the output levels of the video head 3 and the video head 4 during search reproduction in the standard mode.

FIG. 12 is a waveform diagram showing the output levels of the video head 3 and the video head 4 during the standard mode search reproduction.

FIG. 13 is a diagram showing a recording pattern on a magnetic tape in triple mode using the rotary head according to the present invention.

FIG. 14 is a diagram showing a recording pattern on a magnetic tape in a double mode using the rotary head according to the present invention.

FIG. 15 is a control block diagram of an embodiment of optimum tracking control during 6 × mode reproduction according to the present invention.

16 is a diagram for explaining the operation of the control block diagram of FIG.

FIG. 17 is a block diagram of an embodiment of a high-speed fast-forward / rewind control means in the 6 × mode according to the present invention.

FIG. 18 is a recording pattern diagram on the magnetic tape showing the recording pattern of FIG. 13 in an enlarged manner.

19 is an enlarged pattern diagram showing a tracking phase relationship between the magnetic tape of FIG. 7 and each head.

20 is a diagram showing a display example of a video signal reproduced by the recording pattern of FIG.

FIG. 21 is a detailed relative positional relationship diagram showing the tracking phase relationship between the tape and the head when the 5 × mode recording pattern to which the present invention is applied is reproduced.

22 is a recording pattern diagram in which the recording pattern of FIG. 19 is improved.

23 is a circuit diagram showing an example of a detailed circuit for realizing the recording pattern of FIG.

FIG. 24 is a relative positional relationship diagram showing the tracking phase relationship between the tape and the head during 6 × mode reproduction according to another embodiment of the present invention.

FIG. 25 is a circuit diagram showing an example of circuit means for realizing the tracking phase relationship of FIG. 24.

[Explanation of symbols]

1 rotating drum 2, 3 (for standard mode) video head 4, 5 (for 6x mode) video head 6,7 voice head 8 magnetic tape 9 audio tracks 10 video tracks 15 Timing control circuit 27 drum motor 28 Capstan 30 capstan motor 34 Envelope detection circuit 35 Drum servo control circuit 39 Capstan servo control circuit 40 Reference signal generator 41 Delay circuit 42 Tracking control circuit 43 control head 48, 49 reel stand 50, 51, 56 FG pulse generator 54 motor 55 Driving force transmission means 57 Roll diameter detecting means 58 Speed detection means 59 Deceleration setting means 60 Target speed switching means 61 Speed error detecting means 65 Stop determination means 66 Brake drive means 67 Data detection means 71-73 0.25H delay circuit 74, 76 SW circuit 75 recording amplifier 77 Delay control circuit 78 2 multiplication circuit 79, 80 SW circuit 81 Speed detection circuit 82 Phase detection circuit 83 Adder circuit 84 Input terminal 86 mode switching circuit

Front page continuation (72) Inventor Akifumi Sanbe, 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi, Ltd. Multimedia system development headquarters (72) Inventor Katsuyuki Watanabe 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Company Hitachi Ltd., Multimedia System Development Division (56) Reference JP 59-1418 1 (JP, A) JP 8-87703 (JP, A) JP 7-73405 (JP, A) JP 6-342502 (JP, A) JP-A-2-257413 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G11B 5/008 G11B 5/02 G11B 5/027 G11B 5 / 53 101 H04N 5/7826

Claims (7)

(57) [Claims] 1. A helicopter scan type recording apparatus, comprising: a first video head for recording a video signal on the magnetic tape when the traveling speed of the magnetic tape is a standard speed; and the traveling of the magnetic tape. Recording a video signal on the magnetic tape when the speed is about ⅕ of the standard speed;
And a video head, the second video heads, the running speed of the magnetic tape is the
A recording device for recording a video signal when the speed is about 1/3 of a standard speed . 2. The head width of the second video head is equal to the track pitch of the video signal recorded on the magnetic tape when the running speed of the magnetic tape is about 1/3 of the standard speed. The recording apparatus according to claim 1, wherein: 3. A helical scan type recording apparatus comprising: first and second video heads for recording video signals on a magnetic tape; and the first video head for recording video signals at a standard track pitch. A control means for controlling the first and second video heads so that the second video head records a video signal at about 1/3 and about 1/5 of the standard track pitch. A recording device characterized by the above. 4. The recording apparatus according to claim 3, wherein the head width of the second video head is equal to about 1/3 of the standard track pitch. 5. A helical scan type recording apparatus, comprising: first and second video heads for recording video signals on a magnetic tape; an audio head for recording audio signals on a magnetic tape; and the first video. A first recording mode for recording a video signal and an audio signal at a standard track pitch by a head and the audio head, and a video signal at about 1/5 of the standard track pitch by the second video head and the audio head. Switching means for switching between a second recording mode for recording an audio signal, and recording the video signal and the audio signal with the second video head and the audio head at about 1/3 of the standard track pitch. It has three recording modes, and the switching means switches between the first recording mode, the second recording mode, and the third recording mode. Recording device. 6. A recording apparatus according to any one of claims 1 to 5, which is a VHS standard video tape recorder. 7. The first video head and the second video head each include a pair of heads, and the azimuth angles of the pair of heads are formed so as to be inclined in directions different from each other. The recording device according to any one of claims 1 to 6.