JP2590372B2 - Signal recording / reproducing method and apparatus - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus, and more particularly, to a so-called helical scan system for recording and reproducing obliquely to a running direction of a magnetic tape as a recording medium. In magnetic recording, it has a head moving mechanism that displaces the rotating head mounted on the rotating body in the direction perpendicular to the track direction of the magnetic tape, enabling various editing and signal operations such as monitoring of recording signals and self-dubbing The present invention relates to a multifunctional signal recording / reproducing method and an apparatus therefor.

[Conventional technology]

As described in Japanese Patent Publication No. Sho 62-55756, this type of conventional apparatus uses a magnetic head to move the noise bar generated by a normal head during special playback such as slow motion reproduction and fast motion reproduction in the track width direction. A head moving mechanism is provided for the purpose of reproducing without the noise by displacing the head in a sawtooth shape.
Products that apply such devices to home video have also been produced.

[Problems to be solved by the invention]

The above-described prior art is limited to only reproduction of a recorded tape, and does not consider use at the time of recording.

SUMMARY OF THE INVENTION It is an object of the present invention to monitor a recording signal using a head moving mechanism at the time of recording so as to achieve after recording of high-fidelity, editing such as character insertion, and other various functions. Another object of the present invention is to provide a signal recording / reproducing method and device capable of performing self-dubbing.

[Means for solving the problem]

The object of the present invention is to displace the rotary head for reproduction under the control of a head moving mechanism, to monitor a signal recorded at a first displacement position of the rotary head for reproduction, and to perform the reproduction preceding the rotary head for recording. This is achieved by adopting a configuration in which the reproduced signal is delayed by the storage circuit at the second displacement position of the rotary head, and a new signal is added to the delayed signal and re-recorded.

[Action]

The recording / reproducing signal processing device is different from the conventional one in that the signal recording and reproducing functions operate simultaneously, so that the recorded signal can be immediately reproduced from the tape for monitoring, or the processed reproduced signal can be subjected to some processing immediately. Can be recorded. At this time, the memory means is used as a means for temporarily storing the reproduced signal. At this time, a head moving mechanism in the track width direction for reversing the order in which the recording and reproducing heads trace one track is operated.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a first embodiment of the present invention, wherein 1, 1 '
Is a recording head (for a video signal), 2, 2 'is a playback head (for a video signal, with a moving mechanism), and 3, 3' is a (high-fi) audio head. The audio head is used for both recording and reproduction. 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 recorded video signal,
Is a head moving mechanism, 12 is a head moving controller, 13 is a character signal, 14 is a switching switch, and 15 is a magnetic tape. As the head moving mechanism, a base in which the head is fixed by an electromagnetic force according to Fleming's left-hand rule, which is generated between the above-described known permanent magnet and a magnetic field generated by applying a current to the coil, is used. Is used to vibrate the.

 Hereinafter, the operation of the embodiment of FIG. 1 will be described.

As described above, according to the present invention, the head moving mechanism and the simultaneous operation of the video signal recording / reproducing processor allow the recorded video to be immediately reproduced, characters such as titles to be inserted into the reproduced video, An operation such as recording a voice later can be performed by one device.

FIG. 2 is a diagram for explaining the operation of FIG. 1. First, when the recorded video is reproduced immediately, as shown in FIG. When characters and the like are added to the traced and reproduced video and re-recorded, the reproduction head 2 traces first and the recording head 1 traces later as shown in FIG.

Now, recording head 1,1 ', playback head 2,2', audio head 3,
When the mounting angle of the 3 'spaced by respective 60 °, produces a time difference of laps _^1/6 min between the recording head 1 and the reproducing head 2. If the tape is stationary, the heads on the same disk trace the same track. However,
When the tape runs, a pair of heads facing 180 ° alternately trace the next track. Therefore, the pitch of each track drawn on the tape can be said to be the distance traveled in the track width direction during a half rotation of the head separated by 180 °. Accordingly, the trace pattern of the heads separated by 60 ° is a pattern shifted from the recording head 1 by ^A / ₃ with respect to the recording head 1 assuming that the track pitch is A, as shown in FIG. This is a case where heads separated by 60 ° rotate on the same circumference, so that if the head is displaced by ^A / _{3 in the} width direction, 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 in which the head is mounted as shown in FIGS. 2 (a) and 2 (b). . In the case of FIG. 2, when the head rotation surface is drawn left and right, the position of the head 2 is 2 in FIG.
0,21. In the case of the above trace (a), the head is displaced downward by ^5A / ₃ as shown in (c) 21. In the case of (b), the head is moved as shown in (c) 20 as shown in FIG. Displace upward by ^A / ₃ by 12.

By such an operation, as shown in FIGS. 2 (a) and 2 (b), it is possible to trace the head 2 with respect to the head 1 in a delayed or advanced relationship.

In the case of FIG. 2 (a), the head 2 is two tracks before the head 1 because the adjacent tracks have different azimuth angles.

In the case of FIG. 2 (a), the signal recorded at the head 1 is spread by the head 2 after the head is rotated by 300 °, and is processed by the video signal reproduction processor 5. In the case of FIG. 2 (b), the signal spread by the head 2 is reproduced by the element 5 and stored in the image memory 6 once.

Next, the saved signal is added by the signal adder 7 to the character signal 13. Actually, the character signal 13 is a signal generated by a microcomputer or the like, and the adder 7 determines whether the character of the character signal 13 is present or not by a signal from the image memory 6 and a certain color signal (character color). ) And a switch for switching and outputting.

As for the after-recording operation of Hi-Fi (Hi-Fi), as is well known, there is a technique of reproducing a high-quality sound by FM recording an audio signal using a rotating head. This uses an audio head with a different azimuth angle from the video head and a wider head gap to perform FM deep recording and playback on a carrier that is sufficiently lower than the video signal, and the audio signal is recorded prior to the video signal. Will be re- Therefore, if an audio signal is recorded after the video signal, the video signal is erased, and it has been impossible to perform after-recording of audio. However, according to the present invention, the video signal is reproduced and temporarily stored. Record audio signal. The video signal stored above is recorded again. Thereby, after-recording of hyphen is also possible.

FIGS. 3A and 3B are explanatory diagrams of a second embodiment of the present invention which enables post-recording (after-recording) of hyphen, wherein FIG. 3A is a configuration diagram and FIG. 3B is an explanatory diagram of head displacement. In FIG. 3A, reference numeral 40 denotes a switching switch.

In this embodiment, the video signal recording heads 1 and 1 'and the audio heads 3 and
3 'is a replacement of the embodiment of FIG. Accordance connexion, since between the heads 1 and 2 have a rotational phase angle difference of 120 °, and the recording monitor, the amount of displacement of the track width direction at the time of character insertion are the _^4/3 as in FIG. (B)・
The A and _^2/3 · A. This situation is shown in FIGS. 33 and 32 in FIG. The head moving controller 12 controls the moving head 2 so as to take this displacement amount. on the other hand,
For audio Hi-Fi dubbing, the video signal reproducing head 2 uses the audio head 3 before recording the signal reproduced from the tape at the position 32 in FIG. In order to record an audio signal, for example, 31 in FIG.
(In an actual product, the audio head 3 is not always installed at this position for reasons such as standards. In the present embodiment, the audio track and the video track are completely matched. ing).

FIG. 4 is an explanatory view of a head trace corresponding to the mode selection by the switch 40 of FIG. 3 (a).
(B) and (c) are switching contacts of the switch 40 (a),
Corresponds to (a) and (c). The operation at the time of the Hi-Fi post-recording is shown by a trace on the tape as shown in FIG.

It is reproduced by the head 2 and processed by the video signal reproduction processor 5,
While the signal stored and delayed in the image memory 6 is recorded by the head 1, the audio signal is recorded by the head 3. Therefore,
In the area 30 shown in FIG. 3C, the audio signal is recorded in advance in the deep layer. As described above, the switching switch 40 in FIG. 3 controls the flow of the reproduction signal in each operation mode, and each terminal is connected to the (a) side for monitoring the recording signal, and (a) for inserting the character (title). ) Side, Hi-Fi
At the time of post-recording, it is knocked down to the (c) side. FIG. 4 shows the configuration of the blocks involved in the signal flow in each mode.

In the above-described embodiments, since an operation of superimposing and recording a new signal on a portion recorded on the tape is included, there is an unerased portion, which may interfere. Therefore, image quality can be improved by attaching the rotation erasing head to an appropriate position.

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

FIG. 5 is an explanatory view of a third embodiment of the present invention,
(A) is a configuration diagram, (b) is an operation explanatory diagram, 50 is an erase head, and 51 is an erase signal generator. Since the monitoring of the recording signal is almost the same as that of the embodiment shown in FIGS. 1 and 2, only the operation of Hi-Fi after-recording will be described.

In this embodiment, the head used in the above-described embodiment is a head for recording and reproducing signals, while the head for erasing is used only for demagnetization. In the operation period, erasure is performed two tracks (or more) at a time only during a half rotation period in which the erasing head 50 is in contact with the magnetic tape 15. FIG. 5B shows a case where the erasing head 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 immediately before the track being reproduced, and the reproduction head 2 has already reproduced the image data.
The signal that was temporarily stored is recorded. Further, the audio head 3 records the audio signal with a delayed phase, but the trace coincides with the track trajectory through which the head 2 passes.
As a result, the video signal is reproduced by the head 2 and the head 50 is reproduced.
, An audio signal is recorded by the head 3, and a video signal is recorded by the head 1, so that high-fidelity recording is possible. In the case of this example, the displacement amount of the moving head 2 in the track width direction is ^5A / ₃ as in the case of 21 in FIG. 2 (c) when monitoring the recording signal. In this case, since the playback head is ahead of the storage head by two tracks, the change amount is (2+
_^1/3) A. According to the embodiment shown in FIG. 5, since the audio signal is also erased by the erasing head after tracing the video reproduction head, there is another contrivance when it is desired to leave the audio signal at the time of title insertion.

FIG. 6 is an explanatory view of a fourth embodiment of the present invention.
(A) is a block diagram, (b) is an operation explanatory diagram.

This embodiment is an example in which a recording / reproducing head is provided for audio so that recorded audio information remains even when a character (title) is inserted. In the figure, reference numerals 60 and 60 'denote audio signal reproducing (moving) heads, 61 denotes an audio signal reproduction processor, 62 denotes an audio memory, 63 denotes an adder, 64 denotes a switch, 65 denotes a recording audio, and 66 denotes a recording audio.
Is a reproduced sound, 67 is an audio signal recording / reproducing device, and the other heads are the same elements as those in the above embodiment. For simplicity, a processing system relating to the video signal is not shown, but the operation is not inconsistent with the above-described example, and coexists with the audio processing system of the present embodiment. Hereinafter, the operation of the present embodiment will be described.

First, the audio signal is reproduced by the audio reproducing heads 60 and 60 ', and is reproduced by the audio signal reproducing processor 61. In the case of an audio signal, a synchronization signal is not required unlike a video signal, so the audio memory 62 is not always necessary.However, a cylinder equipped with a head group is synchronized with a video signal to be recorded when the signal is present. Need to rotate. The switching switch 64 selects an operation mode. When it is desired to simply record new audio information (C), and when the signal reproduced from the tape is to be recorded as it is (A), a new signal is added to the signal reproduced from the tape. If you want to add audio information, tilt it to the (A) side. This allows BGM (BackGroundMus
ic) can be inserted later.

The signal having undergone the above processing is modulated into an appropriate form by the audio signal recording processor and recorded on the tape via the heads 3, 3 '. The head is erased by the erasing head 50 while being spread at the heads 60 and 60 'and recorded at the heads 3 and 3'.
Excellent sound quality without damage. Further, the video signal is reproduced at the heads 2 and 2 ', erased at the head 50, and heads 1 and 1'.
The operation of recording enables high-quality image editing.

By the way, in the above-mentioned example, the recording head uses a normal head fixed on a cylinder, and the reproducing head uses a moving head that is displaced in the track width direction. Here, the displacement amount of the reproducing head is an angle α measured from the recording head with the clockwise direction set as +.
From the track to be traced by the recording head according to the number n of reproduced tracks counted in the direction in which the trace proceeds.

(A: Track pitch) For example, if α = −60 ° and n = −2, In other words, it is sufficient to displace ^5A / ₃ downward (FIG. 2 (a)
And (c) 21).

However, on the other hand, since only the relative position of the recording head is a problem, it is conceivable to use a moving head for recording and a head without a moving mechanism for reproduction, and a similar function is realized.

Now, it is conceivable that both the recording head and the reproducing head are moving heads, and the number of heads is reduced to realize the editing function. The embodiment will be described below.

FIG. 7 is a block diagram showing a fifth embodiment of the present invention.
70 and 70 'are moving heads for video signals, 71 and 71' are moving heads for audio signals, 72 is a moving head for erasure, and 76.
Is an erasing signal generator, 77, 78, 79 are moving head displacement control circuits, 80 is a capstan motor, 81 is a tape speed control circuit, 82 to 85 are switching switches, 86 is a video signal reproduction processing circuit, and 87 is a video A 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 a diagram for explaining the operation of FIG. 7, in which 90 to 94 are track patterns on the tape, 94 to 100, 102 to 109 are time zones,
1,110 are head switching signals for video and audio, which switch heads 70,70 'and heads 71,71', respectively.

 An operation outline of the present embodiment will be described.

First, the cylinder and the tape speed is usually speeds, characters (title) of the tape speed during insertion ^_1/2
To Then, it takes twice as long to run the tape, so half of the time can be used for reproducing the tape and recording in the memory, and the other half of the time can be used for recording the signal from the memory or a signal replacing it. FIG. 8 shows this at a specific timing.

In FIG. 7, the audio heads 71 and 71 'are set to the reproduction mode at the time zone 107, the recording mode at 108, the reproduction mode at 109, and so on. The time zones 102, 104, and 106 are activated on the head 71 side, and the time zones 103 and 105 are activated on the head 71 'side. At this time, the head 71 reproduces the track 90 in the time zone 102 and records the track 90. Also,
The head 71 'reproduces the track 91 in the time zone 103 and records it in 105. Thereafter, the same operation is performed for the next tracks 92 and 93. In the present embodiment, the pair of audio heads 71, 71 'and the pair of video heads 70, 70' are mounted at an angle of 90 degrees, so that the operation phase of the pair of video heads 70, 70 'is 90. Delay.
Accordingly, the time periods 94, 96, 98 correspond to the trace of the head 70, 95, 97
Is the trace of head 70 ', time zone 99 is played, 100 is recorded,
Further, the trace of the track 90 is obtained in the time zones 94 and 96, and the trace of the track 91 is obtained in the time zones 95 and 97. In this embodiment, reproduction and recording are not performed at the same time, and the reproduced signal needs to be stored for a time corresponding to the rotation of the cylinder. The memories 120 and 121 are used for this purpose, where 120 is for video signals and 121 is for audio signals. The switching switch switches between recording and reproduction modes. For example, the switching switches 82 and 83 are tilted to the (A) side during the time zone 99 and to the (A) side at 100. Further, the switching switches 84 and 85 are tilted to the (A) side and the switch 108 is tilted to the (A) side in the time zone 107. By the way, in this embodiment, the tape feeding speed is
Where it is _^1/2, the head displacement is in certain trace pattern of tracks will be different from one as for normal speed travel. Therefore, the moving head displacement control circuits 77 to 79 are controlled so as to obtain a track pattern during normal speed running. This control corresponds to the slow motion reproduction technique using the moving head, and can be realized by the above-mentioned known technique.

〔The invention's effect〕

As described above, according to the present invention, Hi is conventionally impossible with a single magnetic recording / reproducing device, and even if two devices are used, it takes a great deal of trouble such as mutual synchronization.
-Fi audio dubbing and text (title) insertion can be performed by a single device, and a recording monitor, etc. can be used.
It is possible to provide a signal recording / reproducing method and a device capable of monitoring a recording signal having excellent functions capable of improving functions in editing and the like and performing self-dubbing.

[Brief description of the drawings]

FIG. 1 is a block diagram of a first embodiment of the present invention, FIG. 2 is an explanatory diagram of the operation of FIG. 1, 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 a third embodiment of the present invention, FIG. 6 is an explanatory diagram of a fourth embodiment of the present invention, and FIG. FIG. 8 is a block diagram of the fifth embodiment, and FIG. 8 is an operation explanatory diagram of FIG. 1,1 ': Video signal recording head, 2,2': Video signal reproduction head, 3,3 ': Audio signal recording / reproduction head, 4 ...
Video signal recording processor, 5 ... Video signal reproduction processor, 6 ...
... Image memory, 7 ... Signal adder, 8 ... Audio signal processor, 9 ... Reproduction video signal, 10 ... Recording video signal, 11 ...
Head moving mechanism, 12 ... Head moving controller.

Claims (4)

(57) [Claims] An at least two recording rotary head provided on a rotating body, and at least two recording rotary heads provided on the rotating body.
A signal recording / reproducing method for a signal recording / reproducing apparatus comprising: a plurality of reproducing rotary heads; and a head moving mechanism for controlling the reproducing rotary head to be displaced in a direction perpendicular to a rotation plane thereof. During signal recording by the head, the reproducing rotary head is displaced to a first position following the track recorded by the recording rotary head under the control of the head moving mechanism, and recording is performed by reproducing the recorded signal. A first mode for realizing the function of monitoring the read signal, and displacing the reproducing rotary head to a second position for pre-scanning the recording rotary head under the control of the head moving mechanism. A track already recorded by the head is reproduced, the reproduced signal is delayed by the storage means, and the output of the storage means is output. A second mode in which a new second signal is added to the track, and recording is performed again on the track using the recording rotary head. The recording monitor function and a part of image information on a recording medium are A signal recording / reproducing method for realizing a rewriting function. 2. At least two rotating heads for video recording provided on a rotating body, and at least two rotating heads for audio recording arranged on the rotating body and preceding the rotating head for video recording. A signal comprising: a head; at least two rotating heads for video reproduction provided on the rotating body; and a head moving mechanism for controlling the rotating head for video reproduction to be displaced in a direction perpendicular to the plane of rotation. In the signal recording / reproducing method of the recording / reproducing apparatus, a first method of following a track recorded by the video recording rotary head during signal recording by the video recording rotary head.
A first mode for displacing the rotating head for video reproduction to a position under the control of the head moving mechanism to realize a monitor function of a recorded video signal by reproducing the recorded video signal; The video reproducing rotary head is displaced to a second position for pre-scanning the rotary head and the audio recording rotary head under the control of the head moving mechanism, and the video already recorded by the video reproducing rotary head. A track is reproduced, the reproduced video signal is delayed by the storage means, and a new audio signal is recorded on the audio track by the audio recording rotary head, and the output of the storage means is output using the video recording rotary head. A second mode for re-recording at the video track position over the audio track; Signal recording and reproducing method characterized by realizing the Nita function, the function of rewriting only a part of the audio information on the recording medium. 3. At least two rotating heads for video recording provided on a rotating body, and at least two rotating heads for audio recording provided on the rotating body and preceding the rotating head for video recording. A signal comprising: a head; at least two rotating heads for video reproduction provided on the rotating body; and a head moving mechanism for controlling the rotating head for video reproduction to be displaced in a direction perpendicular to the plane of rotation. In the signal recording / reproducing method of the recording / reproducing apparatus, a first method of following a track recorded by the video recording rotary head during signal recording by the video recording rotary head.
A first mode for displacing the rotating head for video reproduction to a position under the control of the head moving mechanism to realize a monitor function of a recorded video signal by reproducing the recorded video signal; The video reproducing rotary head is displaced to a second position for pre-scanning with respect to the rotary head under the control of the head moving mechanism, and a track already recorded is reproduced by the video reproducing rotary head. A second mode in which the video signal is delayed by the storage means, a new second signal is added to the output of the storage means, and the track is recorded again using the video recording rotary head; Moving the rotary head for image reproduction to a head and a second position for pre-scanning the rotary head for audio recording; The video recording rotary head is displaced by the control of the frame to reproduce a track already recorded by the video reproducing rotary head, the reproduced video signal is delayed by the storage means, and a new audio signal is transmitted by the audio recording rotary head to the audio track. And a third mode of recording the output of the storage means on the audio track using the video recording rotary head and recording the output again at the video track position. A signal recording / reproducing method which realizes a function of rewriting only some of the above image information and a function of rewriting only some of the audio information on a recording medium. 4. At least two recording / reproducing rotary heads provided on a rotating body, and a head moving mechanism for controlling the recording / reproducing rotary head to be displaced in a direction perpendicular to a rotation plane thereof. In the signal recording / reproducing method of the signal recording / reproducing apparatus, the speed of the recording medium running while being wound at least 180 degrees or more around the rotating body, when recording the track again,
The recording head is caused to travel at a speed half that of the traveling speed during recording, the recorded track is reproduced by the recording / reproducing rotary head, the reproduced signal is delayed by the storage means, and the output of the storage means is output. And a new second signal,
The at least two recording / reproducing rotary heads are displaced under the control of the head moving mechanism so as to match the track pattern at the traveling speed at the time of recording, and recording is again performed on the track using the recording / reproducing rotary head. And a signal recording / reproducing method.