JPS62154203A - Video signal recording device - Google Patents

Abstract

PURPOSE:To eliminate the need to provide a guard band between each track by constituting the titled device of two pieces and two pairs of video heads which have been placed at positions shifted by 90 deg. from each other on a rotary cylinder, and a tape driving system having recording time tape running speeds of >= two kinds. CONSTITUTION:A magnetic tape 23 is run in the direction indicated with an arrow 29 through guide posts 27, 28 by a capstan 25 and a pinch roller 26. In a recorded track pattern which has been recorded on the magnetic tape 23 by a standard tape running mode, an arrow 24 and the arrow 29 indicate the respective running directions of video heads A1, A2, B1, and B2 and the magnetic tape 23, respectively. The video heads A1, A2, B1, and B2 are attached at an interval of 90 deg., therefore, by delaying them by a delaying circuit by a time portion corresponding to 90 deg., a luminance signal Y is positioned at the adjacent part of the luminance signal Y, and a chrominance signal C is positioned at the adjacent part of the chrominance signal C. In this way, a level of a disturbance from the adjacent track is small, and high density recording having no guard band by overwrite recording can be executed.

Description

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

BACKGROUND OF THE INVENTION In recent years, video tape recorders have been developed in the professional and broadcasting fields that separate and record color video signals into two-channel component signals, a luminance signal and a chrominance signal (for example, M format and βCAM). It is a VTR called ``Broadcasting technology magazine, January 1981 issue P.''
872 to P890).

Problems to be Solved by the Invention In the recording trunk recorded on the conventional 2-channel combo net'/TRd, i-air tape, there is a chrominance signal track adjacent to the luminance signal track.
Even if an azimuth angle is set between the luminance signal recording head and the color signal recording head, overwriting recording (so-called solid writing) is impossible, and the so-called 1 standard tape running mode and long tape running mode are impossible. It was difficult to switch modes for summer use.

Means for Solving the Problems The present invention solves the above-mentioned problems, and provides a two-channel component recording VTR that has two or more types of tape running speeds during recording, and that is divided into two channels. A device for recording each signal, consisting of two sets of two video heads arranged at positions shifted by 900 degrees from each other on a rotating cylinder, a tape having two or more types of tape running speeds during recording, and a drive system. This is what I did.

Operation The present invention is a two-channel component recording device having the above-described configuration, and is capable of being used by switching between a standard tape running mode and a long-time tape running mode.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of an electromagnetic conversion system showing the configuration of essential parts of the present invention. FIG. 1 is a circuit block diagram showing a signal processing section of the present invention. FIG. 2 is a schematic diagram of the electromagnetic conversion system 14 showing the main structure of the present invention. Input terminal 1 has, for example,
A luminance signal as shown in FIG. 3 is input. The input terminal 2 receives, for example, a time-base compression multiplexed color signal as shown in FIG. 3B. Here - as an example,
A two-channel component signal is formed by the luminance signal and the color signal which has been compressed and lengthened by one time axis. The luminance signal is
It is connected to one input terminal of the first switcher 4 together with the horizontal synchronizing signal separation circuit (H3S) 3 . In the H853, the horizontal synchronizing signal is separated as shown in FIG. 2C and supplied to a flip-flop (FF) 5. The control terminal 6 of the first switcher 4 has an FF5 as shown in the third diagram.
output signal is provided. As an example of the internal configuration of the first switcher 4, as shown in FIG.
．． 8, and outputs to output terminals 9 and 1o.

A signal as shown in FIG. 3E is obtained at the output terminal 9,
At the output terminal 10, a signal as shown in FIG. 3F is obtained. The output signal of the output terminal 9 is modulated by the 7M modulator 11 and supplied to the electromagnetic conversion system 14. The output signal from the output terminal 10 is delayed by a delay time corresponding to the A field in a delay circuit 43, and then modulated by an FM modulator 12 and supplied to an electromagnetic conversion system 14. These input terminals 1, 2 . H3
S3. First switcher 4°FFs, 7M modulator 11.
12. The recording circuit section 13 is constituted by the delay circuit 43. FIG. 2 shows a configuration diagram of the main parts of the electromagnetic conversion system 14. The FM signal input to the input terminals 15, 16 of the electromagnetic conversion system 14 passes through rotary transformers 18, 19, 20, and 21, and then is sent to the video head A11 arranged on the rotary disk 22.

It is recorded on one magnetic tape 23 via B, , B2.

The rotating disk 22 rotates in the direction of the arrow 24 at approximately 30 Hz (
Depending on the broadcasting method, it rotates at a rotation speed of approximately 26H2). (The motor serving as the drive source and the motor control circuit are not shown) Video head A.

A2. B, , 82 are mounted 90' apart from each other.

The magnetic tape 23 is moved by the capstan 26 and the pinch roller 26 through the guide posts 27 and 28 in the direction indicated by the arrow 2.
It is driven in the direction of 9. By selecting a recording mode switch (not shown), the running speed can be switched between a standard tape running mode, which is a normal running speed, and a long-time tape running mode, which is a running speed at which the normal running speed is started (or in some cases, dedicated). It will be done. FIG. 5 shows a recording track pattern (portion) recorded on the magnetic tape 23 in the standard tape running mode. In FIG. 6, arrow 24 indicates video head A,...
A2. The arrow 29 indicates the direction in which the magnetic tape 23 runs. Recording tracks 101, 10
5 is the recording track recorded by the video head A, and recording tracks 102 and 106 are recorded by the video head A.
, recording track 103 is a recording track recorded by video head B, and recording track 104 is a recording track recorded by video head B.
This is a recording track recorded by No. 2.

The signals recorded by video heads A1 and B1 are shown in Fig. 3E.
The signals recorded by video heads A2 and B2 are shown in FIG. 3F. As mentioned above, since the video heads A192+B and vB2 are each installed at 90' intervals, the signal shown in FIG. As a result, a track pattern as shown in FIG. 6 is obtained. That is, the luminance signal (Y) is located adjacent to the luminance signal (Y), and the chrominance signal (C) is located adjacent to the chrominance signal (C). Therefore, during overwriting recording (solid writing recording), the level of interference from adjacent tracks is small, and high accuracy recording without guard bands is possible due to overwriting recording (solid writing recording). In addition, as shown in FIG. 5, the azimuth recording between each track is
Needless to say, this is an effective means for overwriting recording (solid writing recording).

Next, a case will be described in which recording is performed at a running speed of 113 (in some cases, bar), which is the normal running speed, that is, in a long-time tape running mode. Depending on the tape running speed, each video track has a portion of
Because it is re-recorded by the next scanning video head,
A tape pattern as shown in FIG. 6 is obtained. In addition,
For the sake of clarity, FIG. 6 is enlarged three times in the track width direction compared to FIG. 6. recording track 30
1° 306 is a recording track recorded by video head person, recording track 302.306 is a recording track recorded by video head A2, and recording track 303 is a recording track recorded by video head B. Yes.

Recording track 304 is a recording track recorded by video head B2.

As in the conventional example (like βCAM or M format), for example, the person, -\rad, and B, head are installed close to each other, and furthermore, the rotation plane of the person, head, and B1 head is at a distance corresponding to one track pitch. If the IA2'''2 head is also attached in the same way, the recording track pattern will be as shown in FIG. 7 in the marker tape running mode. That is, IA1tB
+The head has a receiver for recording and reproducing the luminance signal (Y), and the A2
．． The B2 head is responsible for recording and reproducing the color signal (C). As shown in FIG. 7, since the color signal is recorded adjacent to the luminance signal, overwriting recording (solid recording) becomes impossible due to interference between adjacent tracks, and a guard band is required. Therefore, the conventional example has a lower recording density than the example according to the present invention. In addition, in FIG. 6, the recording track 201
An example of a recording track according to the ~206Vi conventional example is shown7
ing.

Furthermore, in the case of long tape running mode.

Recording and playback is not possible because the video trunks overlap.

Note that in the above explanation, the luminance signal and the time axis compression multiplexed color signal were used as the signals handled by the video signal recording device that records each of the video signals divided into two channels, but the magnetic tape 23 The signal recorded in F
Even in the case of two-channel recording in which an M luminance signal and an FM two-color difference signal are frequency-multiplexed, by switching the channel switcher provided in the recording circuit section 13 every 1H, the results shown in FIGS. Since the recording track pattern on the magnetic tape 23 as shown in FIG.

That is, the present invention is applied to various video signal recording devices in which the electromagnetic conversion section 14 is capable of two-channel recording, and the input signal to the recording circuit section 13 is a luminance signal and two types of color difference signals. Even if it's an R signal.

The G signal and the B signal may be a signal obtained by time-base compression multiplexing a luminance signal and two types of color difference signals as shown in this embodiment. Furthermore, even if a one-channel signal such as a MAC signal in which a luminance signal and a line-sequential color signal are time-base compression multiplexed is an input signal to the recording circuit section 13, the electromagnetic conversion section 14 The same applies to the case where the signal is treated as a two-channel signal whose time axis has been expanded at the time of channel recording. Furthermore, the luminance signal and 2
The same applies to a single channel signal in which all types of color difference signals are time-base compression multiplexed.

Also, the recording i-rack pattern on the magnetic tape 23 is the fifth
For example, nH
The brightness signal and color signal are switched every (n: any positive number), and the video head A similar effect can be obtained by arranging the +"21Bj 182. A similar effect can be obtained even if the delay time of the delay circuit 43 is not limited to a strong field or an f-field.

Effects of the Invention In a recording device that performs two-channel recording on a magnetic tape pattern, when the heads for two-channel recording are mounted close to each other as in the conventional example, there is a gap between the luminance signal track and the chrominance signal track. It is necessary to provide a guard band, and the tape utilization rate decreases accordingly. Furthermore, it is not possible to use multiple tape running speed modes such as a standard tape running mode and a long running mode during recording.

However, as shown in the present invention, two-channel recording heads are placed at positions separated by 900 mm, and the recording channel of the recording signal is switched every nH. By configuring the track so that the color signal is recorded and the color signal being recorded on the track adjacent to the color signal, the influence of crosstalk between adjacent tracks is reduced to a negligible extent, so a guard band is placed between each track. There is no need to provide a tape, which has the effect of increasing the tape utilization rate.

Another advantage is that it is possible to have a plurality of recording tape running modes, such as a standard tape running mode and a long-time tape running mode.

[Brief explanation of drawings]

FIG. 1 is a circuit block diagram showing a signal processing section in an embodiment of the present invention, and FIG. 2 is an electromagnetic conversion system 14 in FIG.
3 is a signal waveform diagram of each part in FIG. 1, FIG. 4 is a specific configuration diagram of the switcher 4 in FIG. 1, and FIG. 6 is a diagram of the recording recorded on the magnetic tape 23 according to the present invention. FIG. 6 is a pattern diagram showing another example of the pattern recorded on the magnetic tape 23 according to the present invention, and FIG. 7 is a pattern diagram showing another example of the pattern recorded on the magnetic tape 23 in the conventional example. It is a pattern diagram which shows an example. 3...Horizontal synchronization signal separation circuit, 4...
First switcher, 6...Flip-flop, 14----Electromagnetic conversion system, 23...
Magnetic tape, 43...Delay circuit, 101.10
2,103,104,105°106... recording track, 301,302°303.304.305.
308...recording track, A,, A2. B...
B2...Video head. Name of agent Patent attorney Toshio Nakao and one other person (C
I:LL,jCh uj LLFigure 4

Claims (2)

[Claims] (1) A device that records each of the video signals divided into two channels, which includes two sets of two video heads arranged at positions shifted by 90 degrees from each other on a rotating cylinder, and two or more types of recording. 1. A video signal recording device comprising: a tape drive system having a tape running speed of (2) comprising a channel switcher, a 1/2 field delay circuit, a first FM circuit, and a second FM circuit,
The input two-channel video signal is supplied to the channel switcher, and the channel switcher mutually switches the channels of the input video signal every nH (n: positive integer, H: horizontal synchronization interval), One output signal of the channel switcher is supplied to the first FM circuit via the 1/2 field delay circuit, and the other output signal is
by supplying the output signal of each FM circuit to the second FM circuit and supplying the output signal of each FM circuit to the two sets of video heads.
At each of the above types of tape running speeds, the channel of the recording signal on the recorded tape is switched every nH, and the video signal is divided into two channels into which the recording signal of the adjacent track is input. 2. The video signal recording device according to claim 1, wherein the video signal recording device is the same channel as the video signal recording device.