JPH0283804A - Method and device for recording and reproducing signal - Google Patents

Abstract

PURPOSE:To realize a multifunctional signal recording and reproducing method and device such as the monitor of a recording signal and self-dubbing by adding a recording and reproducing signal processor to separate the recording and reproducing of a tape and simultaneously execute them and a memory means to an ordinary recording and reproducing device and using them at the time of recording a head moving function. CONSTITUTION:By the operation of a head moving controller 12 and the simultaneous action of a recording processor 4 and a reproducing processor 5 of a video signal, the picture recorded movies can be immediately reproduced, the character such as a title is inserted into the reproduced video and a high fidelity sound can be recorded after that. When the picture recorded video is reproduced immediately, a signal recorded by a recording head 1 is picked up by a head 2 and processed by the reproducing processor 5. When the character, etc., are added to the reproduced video and re-recording is executed, a signal picked up by the head 2 is reproduced by an element 5 and once accumulated in a memory 6. The accumulated signal is added and re-recorded by a character signal 13 and a signal adder 7.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic recording and reproducing device, and in particular to a so-called helical scan method that records and reproduces data obliquely to the running direction of a magnetic tape, which is a recording medium. In magnetic recording, it is equipped with a head moving mechanism that displaces a rotating head mounted on a rotating body in a direction perpendicular to the track direction of the magnetic tape, enabling a variety of editing and signal manipulations such as monitoring recorded signals and self-dubbing. This invention relates to a multifunctional signal recording and reproducing method and device.

[Conventional technology]

As described in Japanese Patent Publication No. 62-55756, a conventional device of this type uses a magnetic head that is sawed in the width direction of the track to eliminate noise bars that would occur with a normal head during special playback such as slow-motion playback and fast-motion playback. A head moving mechanism was provided for the purpose of producing noise-free reproduction by displacing the head in a wave-like manner. Products that apply such devices to home video cameras have also been created.

[Problem to be solved by the invention]

The above-mentioned conventional technology is limited to only reproducing recorded tapes, and does not take into account usage during recording.

An object of the present invention is to provide a recording signal monitor that utilizes the head moving mechanism during recording to achieve high functionality in high-fidelity after-recording, editing such as character insertion, and other various fields. Another object of the present invention is to provide a signal recording/reproducing method and apparatus capable of self-dubbing.

[Means to solve the problem]

The above object is achieved by adding a recording/playback signal processing device and a memory means to a normal recording/playback device to separate and simultaneously perform tape recording and playback. Since the signal recording and playback functions operate simultaneously, the recorded signal can be immediately played back from the tape for monitoring, or the played signal can be processed in some way and immediately recorded. At this time, the memory means is used as a means for temporarily storing the reproduced signal. Also, at this time, a disk moving mechanism in the width direction of the track is operated to reverse the order in which each recording and reproducing head traces one track.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram of a first embodiment of the present invention, and includes 1.1
'' is a recording head (for video signals), 2,2'' is a playback head (with 1 mubbing mechanism for video signals), 3.3 is a (hi-fi) audio head, and the audio head is used for recording 1 playback partner. . Furthermore, 4 is a video signal recording processor, 5 is a video signal reproduction processor, 6 is an image memory, 7 is a signal adder,
8 is an audio signal processor, 9 is a reproduced video signal, 10 is a recorded video signal, 11 is a helad moving mechanism, 12 is a helad moving controller, 13 is a character signal, 14 is a changeover switch, and 15 is a magnetic tape. . The head moving mechanism is a mechanism that vibrates the base body to which the head is fixed by the electromagnetic force generated between the permanent magnet, which is the well-known technology mentioned above, and the magnetic field generated by passing a current through a coil, and which follows Fleming's left hand rule. Use.

The operation of the embodiment shown in FIG. 1 will be explained below.

As described above, the present invention uses the simultaneous operation of the head moving mechanism and the video signal recording/playback processor to immediately play back recorded video, insert characters such as a title into the played video, and use the high-fidelity This allows operations such as recording audio later on to be performed with a single device.

FIG. 2 is an explanatory diagram of the operation of FIG. 1. First, when a recorded video is to be played back immediately, the recording head 1 first plays the track, and the playback head 2 plays the track later, as shown in FIG. 2(a). When tracing and re-recording a reproduced video by adding characters or the like, the reproducing head 2 traces first, and the recording head 1 traces later, as shown in FIG. 2(b).

Now, if the mounting angles of recording heads 1, 1°, playback heads 2, 2 and audio heads 3, 3° are placed 60" apart, there will be 18 rotations between recording head 1 and playback head 2. If the tape is stationary, heads on the same disk will trace the same single track.However, when the tape runs, a pair of opposing heads 1806 alternately trace the next track. Therefore, the pitch of each track drawn on the tape can be said to be the distance that the heads separated by 180 degrees move in the track width direction during half a rotation.Therefore, the trace pattern of the heads separated by 60 degrees is as shown in Figure (C). As shown, if the playback head 2 is compared to the recording head 1, the pattern will be shifted by 4 if the track pitch is A. This is the case where the heads separated by 60' rotate on the same circumference. Therefore, 1 in the width direction
If the head is displaced eight times, the same track pattern will be traced.

In order to change the tracing order of the recording head and the reproducing head as described above, the head is displaced in the track width direction, that is, in the vertical direction of the rotating cylinder to which the head is attached, as shown in Figure 2 (a) and (b). . In the case of Figure 2, if the head rotation plane is moved left and right, the position of head 2 is 2 in Figure (C).
0.21.

In the case of the trace (a), the head is displaced downward by ``8'' as shown in 21 in (C), and in the case of (b), the head is displaced downward by ``8'' as shown in 21 in (C).
) as in 20 of Fig. 1.
Displace it upward by 18.

By such an operation, it becomes possible to perform tracing in which the head 2 lags or advances relative to the head 1, as shown in FIGS. 2(a) and 2(b).

Here's the nth! In the case of I(a), head 2 is two tracks ahead of head 1 because adjacent tracks have different azimuth angles.

In the case of FIG. 2(a), the signal recorded by the head 1 is read out by the head 2 after the head has rotated 300 degrees, and is processed by the video signal reproduction processor 5. In the case of FIG. 2(b), the signal picked up by the head 2 is reproduced by the element 5 and stored once in the image memory 6.

Next, the stored signal is added to the character signal 13 by the signal adder 7. Actually, the character signal 13 is a signal generated by a microcomputer, etc., and the adder 7 determines whether or not the character of the character signal 13 exists.
It is also possible to configure it with a switch that switches between and outputs a signal from the image memory 6 and a constant color signal (determining the color of characters).

As for Ht-Fi (hi-fi) after-recording operations, as is well known, there is a technology for reproducing high-quality sound by recording audio signals in FM using a rotating head. This uses an audio head with a different azimuth angle and a wider head gap length than the video head to perform FM deep recording and playback using a carrier wave that is sufficiently lower than the video signal, and the audio signal precedes the video signal. It will be recorded and played.

For this reason, if you try to record the audio signal after the video signal, the video signal will be erased, making it impossible to record the audio after the video signal. However, according to the present invention, (1) the video signal is reproduced and stored for - hours; ■Record audio signals. ■Re-record the video signal saved in (■) above. This makes it possible to perform high-fidelity after-recording.

FIG. 3 is an explanatory diagram of a second embodiment of the present invention that enables high-fidelity dubbing (after-recording), in which (a) is a configuration diagram, and (b) is an explanatory diagram of the amount of head displacement. In addition, in the same figure (a), 40 is a changeover switch.

In this embodiment, the video signal recording head 1, 1° and the audio head 3, 3'' are replaced with respect to the embodiment shown in FIG. Since there is a rotational phase angle difference of 100°, the displacements in the track width direction during recording monitoring and character insertion are 4/3 A and 2/3 A, respectively, as shown in Figure (b). The illustrated position is 33°32 in FIG. The video signal recording head 1 receives the signal reproduced from the tape by the reproduction head 2 at position 32 in FIG.
For example, in order to record the audio signal with the audio head 3, the audio head 3 is placed at the position 31 in FIG.
(In actual products, it is not necessarily installed at this position due to standards and other reasons. In this embodiment, the audio track and video track have a completely matching pattern.)

FIG. 4 is an explanatory diagram of head tracing corresponding to the mode selection by the switch 40 in FIG. 3(a).
(b) and (c) are switching contacts of switch 40 (a)
.

Corresponds to (a) and (tsu). The operation during the Hi-Fj after-recording is shown by tracing on the tape as shown in FIG. 3(C).

The head 3 records an audio signal while the head 2 reproduces the signal, processes it in the video signal reproduction processor 5, stores it in the image memory 6, and records the delayed signal in the head 1. Therefore, in the area 30 of FIG. 3(C), the audio signal is recorded in advance and in a deep layer. As mentioned above, the changeover switch 40 in FIG. 3 controls the flow of the reproduced signal in each operation mode, and each terminal is connected to the
A) side, (A) side when inserting characters (title), Hi-F
When dubbing, he is turned to the side. The configuration of blocks involved in signal flow in each mode is as shown in FIG. 4.

Now, in the embodiments so far, since the operation includes recording a new signal over the recorded portion on the tape, there is an unerased area, which may cause interference.

Therefore, by placing the rotary erasing head in an appropriate position, it is possible to improve the image quality.

Next, an embodiment in which an erasing head is also installed will be described.

FIG. 5 is an explanatory diagram of the third embodiment of the present invention, (a
) is a configuration diagram, shi) is an operation explanatory diagram, 50 is an erasing head,
51 is an erase signal generator. Monitoring of the recording signal is almost the same as the embodiments shown in Figures 1 and 2, so
The operation of Hi-F i dubbing will be mainly explained.

In this embodiment, the heads used in the previous embodiments were for signal recording and reproduction, whereas the erasing head was
Since the purpose is only for demagnetization, one is enough. Further, during the operation period, the erasing head 50 erases two tracks (or more) at a time only during a half-rotation period in which it is in contact with the magnetic tape 15. FIG. 2B shows a case where the eraser pad 50 is in contact with the magnetic tape.

First, immediately after the reproducing head 2 reproduces the video signal, the erasing head 50 erases the signal over two tracks. On the other hand, the recording head 1 scans the track two tracks before the track being reproduced, and the image memory 6
It records the signals temporarily stored in . Furthermore, although the audio head 3 records audio signals with a delayed phase, what is traced matches the track locus passed by the head 2.

As a result, ■ video signal reproduction by head 2, ■ head 5
0, (2) audio signal recording by the head 3, (2) video signal recording by the head 1, and high-fidelity dubbing becomes possible. In this example, the amount of displacement of the moving head 2 in the track width direction is 5A/3 when monitoring the recording signal, similar to 21 in FIG. 2(C), but when Hi-Fi dubbing and character (title) insertion In this case, the playback head is ahead of the storage head by two tracks, so the amount of change is (2
+ A to Kanhachi. According to the embodiment shown in FIG. 5, after tracing by the video playback head, the audio signal is also erased by the erasing head, so if it is desired to leave the audio signal as it is when inserting a title, other measures are required.

FIG. 6 is an explanatory diagram of a fourth embodiment of the present invention, (a)
1 is a configuration diagram, and 3) is an operation explanatory diagram.

This embodiment is an example in which recording and reproducing heads are also provided for audio so that the audio information at the edge of the recording remains even when characters (titles) are inserted. In the figure, 60, 60° is an audio signal reproduction (moving) head, 61 is an audio signal reproduction processor, 62 is an audio memory, 63 is an adder, 64 is a changeover switch, 65
numeral 66 is a recording sound, 66 is a reproduction sound, 67 is an audio signal recording/reproducing device, and the other heads are the same elements as in the previous embodiment.

Further, for the sake of simplicity, the processing system related to the video signal l is not shown in the figure, but its operation is not inconsistent with the previous example and coexists with the audio processing system of this embodiment.

The operation of this embodiment will be explained below.

First, it is opened by the audio reproduction head 60.60',
The audio signal is reproduced by the audio signal reproduction processor 61. In the case of an audio signal, unlike a video signal, a synchronization signal is not required, so the audio memory 62 is not necessarily required.
If there is a video signal to be recorded, the cylinder to which the head group is mounted needs to rotate in synchronization with the signal. The changeover switch 64 is for selecting the operation mode.
If you simply want to record new audio information, turn it to the (A) side.If you want to record the signal played back from the tape as is, turn it to the (A) side.If you want to add new audio information to the signal played from the tape, turn it to the (A) side. .

This allows BGM (BackGroundMu
sic) etc. can also be inserted later.

The signal that has undergone the above processing is modulated into an appropriate form by an audio signal recording processor and recorded on the tape via heads 3, 3''.
, 3', the erasing head 50 performs erasing during recording, resulting in excellent sound quality without interference. Furthermore, the video signal is reproduced by heads 2 and 2' and head 5.
The operation of erasing with head 0 and recording with head 1.1' enables high-quality image editing.

Incidentally, in the above example, the recording head is a normal head fixed on a cylinder, and the reproducing head is a moving head that is displaced in the track width direction. Here, the amount of displacement of the reproducing head is determined by the angle α measured from the recording head with the clockwise direction as 0, and the number n of reproduction tracks counted from the track traced by the recording head in the direction in which the trace advances.

(A Nidrak pitch) For example, if α=-60°, n=-2, it is sufficient to position it downward to 5A8 (Fig. 2 (a) and (C
), see 21).

However, on the other hand, since the only issue is the relative position of the recording head, it is possible to use a moving head for recording and a head without a moving mechanism for playback.
Similar functionality is achieved.

Now, it is also possible to realize the editing function by using moving heads for both the recording head and the reproducing head, and reducing the number of heads. Examples thereof will be described below.

FIG. 7 is a configuration diagram showing a fifth embodiment of the present invention,
0.70' is a moving head for video signals, 71.7
1 is a moving head for audio signals, 72 is a moving head for erasure, 76 is an erasure signal generator, 77.78.
79 is a moving head displacement control circuit, 80 is a capstan motor, 81 is a tape speed control circuit, 82 to 8
5 is a switching switch, 86 is a video signal reproduction processing circuit, 87 is a video signal recording processing circuit, 88 is an audio signal reproduction processing circuit, 89 is an audio signal recording processing circuit, and 120 and 121 are memories.

FIG. 8 is an explanatory diagram of the operation of FIG.
9 is a time zone, and 101 and 110 are head switching signals for video and audio, which switch heads 70.70' and 71.71°, respectively.

An overview of the operation of this embodiment will be explained.

First, the cylinder and tape speeds are normal speeds, but when characters (titles) are inserted, the tape speed is set to I/. Then, since it takes twice as long for the tape to run, half of that time can be used for playing back the tape and recording to the memory, and the other half can be used for recording signals from the memory or signals in place of it. This is shown in FIG. 8 in terms of specific timing.

The audio head 70.71' in FIG. 7 is in playback mode in time zone 107, recording mode in 10 days, playback mode in 109, -111111. And time zone 102,104°106
, the head 70 side is activated, and the head 70'' side is activated in the time slots 103 and 105. At this time, the head 70 reproduces the track 90 in the time slot 102 and records in the time slot 104. Track 91 is played back in band 103 and recorded in band 105. Then the next track 92.
Similar operation is performed for 93. In this embodiment, a pair of audio heads 70 and 70° and a pair of video heads 71 and 71' are used.
Since the images are mounted at an angle of 90 degrees, the operating phase of the imaging head pair 71 and 71 is delayed by 90 degrees. Therefore, the time period 94, 96.98 is the head 71 trace, 9
597 is head 71' trace, time zone 99 is playback,
100 is recorded, and track 90 at time zone 94.96
The trace of 95°97 becomes the trace of track 9■. In this embodiment, reproduction and recording are not performed at the same time, and the reproduced signal also needs to be stored for a period of time corresponding to the rotation of the cylinder. Memories 120 and 121 are used for this purpose, 120 for video signals and 121 for audio signals.

Also, a changeover switch switches between recording and playback modes. For example, changeover switch 82.83 is set to time zone 99 (A).
At 100, it falls to the (A) side. Also, the changeover switch 84.85 is on the (A) side at M*107, and the switch 10B is on the (A) side.
thrown to the side.

By the way, in this embodiment, since the tape feed speed is set to 172, if each head displacement amount is constant, the trace pattern of the track will be different from that when running at normal speed. Therefore, the moving head displacement control circuit 77~
At step 79, the track pattern is controlled to be the same as when running at normal speed. Since this control corresponds to the slow motion playback technology using a moving head, it can be realized using the above-mentioned known technology.

〔Effect of the invention〕

As explained above, according to the present invention, Hi
-Fi dubbing and character (title) insertion can be performed with a single device, and recording monitoring is also possible, so it is an excellent function that can be used to improve functionality in editing, etc. It is possible to provide a signal recording and reproducing method and apparatus that can perform self-dubbing.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a first embodiment of the present invention, FIG. 2 is an explanatory diagram of the operation of FIG. 1, and FIG. 3 is an explanatory diagram of a second embodiment of the present invention.
4 is an explanatory diagram of the operation of FIG. 3, FIG. 5 is an explanatory diagram of the third embodiment of the present invention, FIG. 6 is an explanatory diagram of the fourth embodiment of the present invention, and FIG. 7 is an explanatory diagram of the fourth embodiment of the present invention. The configuration diagram of the fifth embodiment, FIG. 8 is the seventh embodiment.
It is an explanatory diagram of the operation of the figure. 1.1″-1---Video signal recording head, 2,2'
- Video signal playback head, 3.3°...Audio signal recording and playback head, 4----1 video signal recording processor, 5--1---video signal playback processor, 6 ------・
Image memory, 7--signal adder, 8--1 audio signal processor, 9--playback video signal, 10--1--recorded video signal, 11--head moving mechanism, Head moving controller.

Claims (1)

[Claims] 1. At least two signal recording rotary heads provided opposite to the rotating body and at least two signal reproducing rotary heads provided opposite to the rotary body. and a head moving mechanism for controlling the signal reproducing rotary head to displace it in a direction perpendicular to its rotating surface, in the signal recording and reproducing method of the signal recording and reproducing apparatus, wherein during signal recording by the signal recording head, A signal recording and reproducing method characterized in that the signal being recorded is reproduced by the signal reproducing head. 2. In claim 1, the reproduced signal of the signal reproducing rotary head is applied to the signal recording rotary head and recorded as is, delayed, or superimposed with a signal from another signal source. Characteristic recording and playback method. 3. At least two rotating heads for signal recording provided opposite to the rotating body, at least two rotating heads for signal reproducing provided opposing the rotating body, and the signal reproducing; In a recording/reproducing apparatus comprising a head moving mechanism for controlling a rotary head for displacing the rotary head in a direction perpendicular to its rotating surface, the reproduction signal of the rotary head for signal reproduction may be transmitted as is, delayed, or from another signal source. A feedback processing means is provided to apply the signal to the signal recording rotary head in a superimposed manner with a signal from the signal recording head, and the signal reproduction head and the signal recording head perform reproduction and recording at the same time. Signal recording and reproducing device. 4. At least two signal recording/reproducing rotary heads disposed opposite to each other on the rotary body, a head moving mechanism for displacing each of the rotary heads in a direction perpendicular to the rotating surface thereof, and a head moving mechanism for displacing the respective rotary heads in a direction perpendicular to the rotating surface thereof; A travel control means for controlling the vehicle to travel at 1/2 of the normal travel speed, and a delay means for delaying the reproduced signal reproduced by the signal recording and reproducing rotary head, during one rotation of the rotary body. 1. A signal recording/reproducing device characterized in that the signal recording/reproducing device is configured to record a reproduced signal reproduced during the next rotation. 5. In claim 4, the at least two rotary heads for signal recording and reproducing are at least one head for video signals and one for audio signals, and the respective rotary heads for signal recording and reproducing are arranged on their rotating surfaces. 3. A signal recording and reproducing apparatus comprising a head moving mechanism for displacing the head in a direction perpendicular to the direction of the head, and operating according to the recording and reproducing method according to claim 1 or 2. 6. At least two rotary heads for signal recording provided opposite to the rotating body; at least two rotary heads for signal reproduction provided opposite to the rotary body; In a signal recording and reproducing device equipped with a head moving mechanism that displaces a rotary head in a direction perpendicular to its rotation plane, the reproduced signal of the signal reproducing rotary head is output as is, delayed, or transmitted from another signal source. A signal recording and reproducing device characterized in that a feedback processing means is provided to apply the signal to the signal recording rotary head in a superimposed manner with a signal, and the reproduction and recording by the reproducing rotary head and the recording rotary head are performed simultaneously. Device.