JPH02179903A - Signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent the partial cut-off of a track at a junction at the time of edition by providing two sets of fixed heads arranged on the same periphery at least with their heads fixed, and 3 sets of a set of movable heads arranged on a movable element. CONSTITUTION:At the time of normal recording, a signal is recorded on a tape 11 by first fixed heads 92 (A2 and A2'), and the recorded signal is regenerated by movable heads 10 (B and B'). At the time of normal reproducing, in the same way, the movable heads 10 are controlled by a movable element driving circuit 21 so as to correctly trace a track curve. At the time of editing and recording, based on signal information reproduced from the track recorded already second fixed heads 91 precedent to the first fixed heads 92, the movable heads 10 are controlled so as to completely trace the recorded track, and the information is recorded. Thus the track cut-off or erasing omission due to the track dislocation or the curve change at the junction of the editing is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a video and audio signal recording and reproducing apparatus such as a VTR.

2. Description of the Related Art In recent years, video/audio signal recording and reproducing devices such as VTRs have been designed to achieve higher image quality and higher sound quality, and are transitioning from conventional analog recording to digital recording. From the point of view of recording band etc., V
Digital recording of TR was realized from audio. When recording and reproducing analog video and digital audio simultaneously, the time difference between them is important. That is, since digital audio is time-base compressed and recorded on an extension track of the video signal, it takes one to two frames for the processing. Therefore, in order to match the timing of the reproduced video signal and the audio signal, it is necessary to reproduce the audio signal early in advance. This requires an advanced audio playback head. Furthermore, in order to check the recording state during recording, VTRs for broadcasting, etc., are required to have a simultaneous playback function that allows recording and playback at the same time. For this purpose as well, a head for simultaneous reproduction is required.

A method for realizing these functions with a minimum number of heads and a cylinder head configuration are shown in Japanese Patent Application No. 12378/1982. This involves arranging at least two sets of heads in a rotating cylinder, recording video signals and audio signals with one set of heads, and simultaneously reproducing them with another set of heads.
During playback, the preceding pair of heads plays back the audio signal,
Another set of heads reproduces the video signal and synchronizes the timing of both signals.

Problems to be solved by the invention: A VTR that digitally records not only audio signals but also video signals.
In this case, the timing alignment of both signals as described above is unknown. Because both are processed digitally,
This is because the timing can be adjusted during the processing process. However, in broadcast VTRs, the audio signal is subjected to cross-fade processing when editing. For this purpose, it is necessary to reproduce the audio signal in advance, perform signal processing, and then mix it with the signal to be recorded for an appropriate period of time.

In addition, in digital VTRs, unlike analog VTRs, the S/N is not influenced by the track width, so the track width is not affected by the analog VTR in relation to the error rate.
It can be made much narrower than TR. When the track width became narrower, there were issues such as differences in track curvature between machines and tracking accuracy, making it impossible to obtain maximum output during compatible playback, or parts of the track being cut off at joints during editing.

The present invention provides an apparatus that solves these problems and also enables simultaneous reproduction.

Means for Solving the Problems In order to solve the above problems, the signal recording and reproducing device of the present invention includes two sets of fixed heads and a movable element arranged on the same circumference with at least fixed heights. It has three sets of heads, one set of movable heads, and one set of movable heads during normal recording.At the same time, the recorded portion is played back with the movable head, and during editing, the one set of movable heads records. The present invention has means for recording with a movable head while preliminarily reproducing the recorded green portion with another set of fixed heads preceding the fixed head, and for reproducing signals from the recorded track by the fixed head.

Effect: By providing the above means, normal recording is performed using a fixed head, and during editing, the movable head is displaced in accordance with a pattern that has already been recorded, thereby continuously recording that pattern.

Also, during normal recording, the fixed head records and at the same time the movable head plays back.

Furthermore, during editing, the signal reproduced by the preceding fixed head is mixed with the signal to be recorded, and the displacement of the movable head is controlled based on the signal reproduced by the preceding fixed head, and recording is performed by the movable head. Recorded tracks are played back simultaneously using a fixed head.

Embodiment Fig. 1 shows a block diagram of an embodiment of the present invention, and Fig. 2 (a)
) and FIG. 2(b) are a plan view and a front view showing the head arrangement on the rotating cylinder at that time, and FIG. 3 is a tape pattern diagram, and the present invention will be explained below using these diagrams. explain.

In FIG. 1, 1 is a video signal input terminal to which a video signal is input from the outside, 2 is an audio signal input terminal to which an audio signal is also input, and 3 is a video signal that processes the input video signal in the form of digital recording. A signal recording processing circuit, 4 is an audio signal recording processing circuit that processes the input audio signal into a digital recording format, 6 is an adder that adds the video signal and audio signal to be recorded, and 6 is an appropriate level for recording. 7.8.14 is a switch for switching between recording and playback; 91 is a second fixed head; 92 is a first fixed head; 10 is a movable head; 11 is a tape;
12. 13. 19 is a head amplifier that amplifies the signal reproduced from the head; 15 is a video signal reproduction processing circuit that processes the reproduced digital signal into the original video signal; and 16 is a circuit that also processes the reproduced digital signal into the original audio signal. 17 is a video signal output terminal for outputting a video signal to the outside, 18 is an audio signal output terminal for outputting an audio signal to the outside, 20.22 is for detecting the level of the signal reproduced from the head. The envelope detector 21 is a movable element drive circuit that drives the movable element on which the movable head 10 is mounted in the height direction based on the outputs of the envelope detectors 20 and 21. Also, in Figure 2, A
1. AlA2. A2' is a fixed head, and B and B' are movable heads.

The video signal input to terminal 1 and the audio signal input to terminal 2 are subjected to respective processing for digital recording by video signal recording processing circuit 3 and audio signal recording processing circuit 4, and then sent to adder 5. is added to the recording amplifier 6. During normal recording, the switch 8 is connected to the NR side, the switch 7 is connected to the P side, and the switch 14 is connected to the N side. The output signal of the recording amplifier 6 is recorded on the tape 11 by the first fixed head 92 (A2.A2°) via the NR terminal of the switch 8. At the same time, the recorded signal is reproduced by the movable head 10 (B, B') and guided to the head amplifier 12 via the P terminal of the switch 7. The output signal of the head amplifier 12 is led to a movable element drive circuit 21 via an envelope detector 20, and the movable element to which the movable head 10 is attached is driven by the output signal. In this way, the movable head 10 is connected to the first fixed head 92.
Play back the signal of the track immediately after being recorded. At this time, the movable paddle 10 is driven to the position indicated by the broken line B in FIG. 2(b). The value indicated as hl in FIG. 2(b) indicates that the first fixed head 92 and movable head 10 are attached at an angle of 300.
The height is equivalent to a degree minute. The output signal of the head amplifier 12 is led to the video signal reproduction processing circuit 15 and the audio signal reproduction processing circuit 16 via the N terminal of the switch 14, and undergoes respective processing to restore the digital signal to the original video signal and audio signal. The signals are output from terminals 17 and 18 as simultaneous reproduction signals.

During normal playback, the switch 7 is connected to the P side and the switch 14 is connected to the N side, and the movable head 10 uses the output of the envelope detector 20 to accurately trace the track, even when the track is curved. It is controlled by a drive circuit 21. Of course, the movable head 10 can also be used during special playback.
During editing and recording, the switch 8 is controlled by the movable element drive circuit 21 so that it rides on the track, and the switch 7
is switched to the ER side, and the switch 14 is switched to the E side. During playback before entering editing recording, the switch 7 is connected to the P side by a temporary editing command, and the signal reproduced from the movable head 10 is guided to the envelope detector 20 via the head amplifier 12 and output at one point on the track. The output voltage of the movable element drive circuit 21 that controls the movable element to a head height that maximizes the head height is detected. When recording, the first
The signal reproduced from the track already recorded by the second fixed head 91 preceding the fixed head 92 is guided to the envelope detector 22 via the head amplifier 19, and the envelope detector 22 detects the already recorded track. Bending information is detected. Based on this information, the output voltage of the movable element drive circuit 21 is set, and the movable head 10 is controlled so as to completely trace over the recorded track for recording. In this way, it is possible to prevent tracks from being deleted or unerased parts due to changes in track deviation or bending at joints during editing. That is,
In FIG. 3, when connecting the X pattern to the Y pattern, the X curve and the Y curve are controlled so that they match and are equally spaced. At this time, the movable head 10 moves as shown in FIG.
) and is driven to the position shown by the solid line B. Second
The value h3 in FIG. 3B is a height corresponding to an angle of 60 degrees at which the movable head 10 and the first fixed head 92 are attached.

Further, the output signal of the head amplifier 13 is led to the video signal reproduction processing circuit 15 and the audio signal reproduction processing circuit 16 via the E terminal of the switch 14, and is sent to the video signal output terminal 17 and the audio signal output terminal 18 for simultaneous reproduction of the video signal. A signal and an audio signal are output.

In FIG. 1, an embodiment has been described in which recording follows an already recorded track during editing and recording, and simultaneous playback is also performed, but according to the present invention, it is also possible to further perform processing such as cross-fading. . An embodiment thereof is shown and explained in FIG. 4.

In FIG. 4, the same components as in FIGS. 1 and 2 are represented by the same numbers and operate in the same manner. 23 is the same video signal reproduction processing circuit as 15, and 24 is the same audio signal reproduction processing circuit as 16.

During normal recording, it is exactly the same as the embodiment shown in FIG.

The previously recorded track following operation during editing and recording is the same as in the case of FIG. Here, the second fixed head 91 precedes the position of the movable head 10 during editing by an amount equivalent to the total signal processing time for recording and reproducing video signals and audio signals (see FIG. 2).
b) corresponds to height h2). Second
From the signal reproduced by the fixed head 91 and amplified by the head amplifier 19, curve information of the recorded track is detected in the same way as in the case of FIG. The element is driven. Furthermore, the output signal of the head amplifier 19 is guided to a video signal reproduction processing circuit 23 and an audio signal reproduction processing circuit 24. The output signal of the audio signal reproduction processing circuit 24 is guided to the audio signal recording processing circuit 4, where it is subjected to cross-fade processing with the audio signal to be recorded inputted from the audio signal input terminal 1 at the editing point. At this time, in order to match the timing of the connection between the reproduced signal and the signal to be recorded, the signal reproduced from the second fixed head 91 precedes the input signal by the time required by the audio signal reproduction processing circuit 24. There is a need. Furthermore, in order to match the splice timing on the tape pattern, when the processing in the audio signal recording processing circuit 4 is completed, the movable head 10 is exactly aligned with the second fixed head 9.
It must be at the position of the track played in 1. Therefore, the movable head 10 must be delayed from the second fixed head 91 by the sum of the times required for the audio signal recording processing circuit 4 and the audio signal reproduction processing circuit 24. This is done by controlling the height of the movable head 10 by applying an appropriate voltage to the movable element to which the movable head 10 is attached. The track following control described above is performed in addition to this height control. At this time, the height difference between the second fixed head 91 and the movable head 10 is h in FIG. 2(b) as described above.
It becomes 2.

In this way, by controlling the height of the head 10,
When editing, it is possible to follow the curves of recorded tracks and perform cross-fade editing.

In the case where the second fixed head 91 and the movable head 10 are composed of two heads having an azimuth angle to each other, detection of track bending by the envelope detector 20.22 is performed using signals reproduced by both heads. This can be done by detecting the time difference between.

Since the video signal and the audio signal need to be output at the same timing, the total signal processing time for recording and reproducing them is naturally designed to be the same. Therefore, the video signal reproduction processing circuit 23
By leading the output signal to the video signal recording processing circuit 3 and performing mixing processing, special effect processing such as mixing of the video signal and fade-in/out can be performed. Naturally, special processing such as mixer echo other than crossfading can also be performed on the audio signal.

Effects of the Invention As described above, according to the present invention, with a simple head configuration, recording confirmation can be performed by simultaneous playback during normal recording and editing, and processing such as cross-fading can be performed during editing recording. However, since recording can be performed by following the curvature of the already recorded track, it is possible to narrow the track width and perform high-density recording.

[Brief explanation of the drawing]

1 and 4 are block diagrams showing an embodiment of the present invention, FIG. 2 is a diagram showing the arrangement of heads on a rotating cylinder used in the configurations of FIGS. 1 and 4, and FIG. 3 is a tape pattern. FIG. 3... Video signal recording processing circuit, 4... Audio signal recording processing circuit, 6... Recording amplifier, 91.9
2...Fixed head, 10...Movable head, 12
,13゜19...Head amplifier, 15.23...
・Video signal reproduction processing circuit, 16.24...Audio signal reproduction processing circuit, 20.22...Envelope detector, 21...Movable element drive circuit Name of agent Patent attorney Shigetaka Awano Haka18 No. 2
Figure f At' (b) Σ

Claims (2)

[Claims] (1) A helical scan type signal recording and reproducing device for recording and reproducing signals on a magnetic tape, in which first and second units are installed at target positions on the same circumference of a rotating cylinder and have different heights in the direction of the rotation axis; a second set of two fixed heads, and a set of movable heads that are attached to movable elements provided at target positions on the same circumference of the rotary cylinder, and whose height in the direction of the rotation axis changes according to displacement of the movable elements. a reproduction signal processing section that processes the reproduced signal; a recording signal generation section that generates a recording signal; an envelope detection means that receives the reproduced signal and detects the envelope of the reproduction signal; The output of the recording signal generating section is given to the first fixed head, and the signal read out by the movable head from the recorded track is given to the reproduction signal processing section, which precedes the first fixed head during editing and recording. The reproduced output obtained from the second fixed head is applied to the envelope detecting means, and the movable element is driven according to the output of the envelope detecting means, while the output of the recording signal generating section is applied to the movable head. A signal recording/reproducing apparatus characterized in that the following tracks are sequentially recorded according to a track pattern of the above track pattern, and a signal read out by the first fixed head from the recorded track is supplied to the reproduced signal processing section. (2) A helical scan type signal recording and reproducing device that records and reproduces signals on a magnetic tape, which is attached to a target position on the same circumference of a rotary cylinder, and has first and second disks with different heights in the direction of the rotation axis. , a second set of two fixed heads, and a set of movable heads that are attached to movable elements provided at target positions on the same circumference of the rotary cylinder and whose heights in the rotation axis direction are changed by the movable elements; first and second reproduction signal processing sections that process the reproduced signal; and a recording signal generation section that receives the input signal and/or the signal processed by the first reproduction signal processing section and generates a recording signal. , an envelope detection means for receiving a reproduced signal and detecting an envelope of the reproduced signal; and during normal recording, the output of the recording signal generator is supplied to the first fixed head, and the movable head detects the recorded track from the recorded track. The read signal is supplied to the second reproduction signal processing section, and at the time of editing and recording, the reproduction output obtained from the second fixed head preceding the first fixed head is supplied to the envelope detection means, and the output of the envelope detection means is supplied. While driving the movable element in accordance with A signal recording/reproducing device characterized in that it sequentially records subsequent tracks according to a track pattern, and also provides a signal read out by the first fixed head from the recorded track to the second reproduced signal processing section. .