JPH01296401A - Helical scan type recording device - Google Patents

Abstract

PURPOSE:To eliminate pairing defect, etc., between heads and to realize satisfactory recording by dividing a recording signal, after that, synchronizing the signal and recording all signals with a united type head. CONSTITUTION:The recording signal of a circuit 2, such as a video signal, etc., corresponding to one time revolution of a drum 8, is divided into an (n)- number (an integer number >=2) of signals and these divided signals are synchronized in a delay circuit 4. Then, the synchronized signals are supplied to (n)-chip united type heads A and B with (n)-number of step difference and the above- mentioned (n)-divided signals are simultaneously recorded to a recording tape 9, whose lap angle is 360/n deg.. Thus, the pairing defect between the heads and the linearity problem of a track, etc., are eliminated and the satisfactory recording can be realized with simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a helical scan recording device used for recording video signals and the like.

[Summary of the invention]

The present invention relates to a helical scan type recording device, in which recording signals are divided and synchronized so that all signals can be recorded with an integrated head.

[Conventional technology]

For example, in a two-head helical scan type VTR,
Conventionally, as shown in Fig. 6, the throats for A and B are provided on a drum, facing each other at 180 degrees, and a tape is wound around this drum at a wrap angle of 180 degrees and is run.
A recording track by the B head was formed as shown in FIG.

[Problem to be solved by the invention]

However, in the above-mentioned device, if the B heads are arranged 180 degrees opposite each other, it may be difficult to maintain compatibility or high-density recording if the bearing between the heel F is defective or the linearity of the track formed is different. There was an extremely high risk of causing problems with narrow I/ranking, etc.

In addition, since the heads are installed in two locations, multiple head windows must be formed on the drum, multiple hems are required, and man-hours for adjustments such as angle division are required, resulting in increased manufacturing costs. Problems such as a significant increase in prices also arose.

This application was filed in view of these points.

[Means to solve the problem]

The present invention provides a recording signal (
The circuit (2)) is divided into n (an integer of 2 or more), these divided signals are synchronized (delay circuit (41) L, and the synchronized signals are transferred to an n-chip integrated head (with n steps). A,
B) Supply the recording tape (9) with a lamp angle of □ degrees.
This is a helical scan type recording device that simultaneously records the n-divided signals.

[For production]

According to this, by dividing the recording signal and synchronizing it, it is possible to record all the signals with an integrated head.
This eliminates problems such as poor bearings between heads and problems with track linearity, making it possible to achieve good recording with a simple configuration.

〔Example〕

In FIG. 1, (1) is an input terminal for, for example, a video signal, and the signal from this terminal +11 is sent to the recording circuit (2).
is supplied to form a predetermined recording signal. This recording signal is supplied to the first recording amplifier (3) and also to the second recording amplifier (5) through, for example, a one-field delay circuit (4).

Signals from the recording amplifiers +31 to +5+ are supplied to the rotating drum (8) through recording/reproduction changeover switches +6+ to +71, respectively. This drum (8) is driven to make one revolution in two fields, for example, and two umbilical cords A and B are formed on this drum (8) with a predetermined step difference in a single head. An integrated head is provided. Then, the signal from the amplifier (5) mentioned above is supplied to the leading chip A, and the signal from the amplifier (3) is supplied to the trailing chip B.
Recording is performed on the tape (9) at B.

Furthermore, during playback, the signals from head chips A and B are passed through switch 16) +71 to the playback amplifier (1
0) is taken out at (11). The signal from this amplifier (10) is supplied to, for example, a 1-field delay circuit (12), and the signal from this delay circuit (12) and the amplifier (11
) are taken out alternately for each field by a switch (13). The signal from this switch (13) is then supplied to a reproducing circuit (14), restored to a normal video signal, and taken out to an output terminal (15).

Therefore, in this device, when an input signal is supplied to the terminal (1) as shown in FIG. 2, this field is supplied to the head A as it is, and is also supplied to the head B after being delayed by one field. Here, the heads A and B are in contact with the tape (9) only during the second period of one rotation of the drum (8), and as a result, the heads A and B are in contact with the tape (9) only during the second period of one rotation of the drum (8). Since the 2nd, 4th, etc. fields are simultaneously recorded on the tape (9) and the head B is placed ahead of the belly button FA, recording is performed on the tape (9) in the track pattern shown in Figure 3. be exposed. Furthermore, during reproduction, the signal from head A is delayed by one field, the original signal sequence is restored, and the output signal is extracted.

Recording and playback of video signals is performed in this way. According to the above-mentioned device, all signals can be recorded using an integrated head by dividing and simultaneous recording signals. It is possible to achieve good recording with a simple configuration, eliminating problems such as poor bearings in between and linearity of the trunk.

In addition, according to the above-mentioned device, since compression and expansion of the time axis of the signal are not used, the entire circuit can be designed with a single frequency characteristic, making circuit design etc. easy, and improving manufacturing efficiency. It's advantageous.

Furthermore, FIG. 4 shows a case where the present invention is applied to a digital VTR, and in this case, by digitizing the signal, for example, one field of the video signal can be subdivided.

That is, in the figure, the video signal supplied to the input terminal (21) is digitized by the AD converter (22), and this digital signal is added to the generated parity for error correction by the ECC encoder (23). . This parity-added digital signal is supplied to a channel coder (24), where coding is performed in accordance with the characteristics of the tape head system, etc. This coded signal is supplied to a channel division circuit (25).

Here, the circuit (25) has, for example, a random access memory, in which the supplied signals are sequentially written, and the number of divisions is n, 1! Let T be the period of the rotating drum that describes □ T , where m'=l to n. Signals are extracted at each delay time.

The signals from this dividing circuit (25) are respectively sent to recording amplifiers (26A) to (26D) (if n=4),
The signal is supplied to head chips A to D provided in the integrated head of rotating drum (28) J through recording/reproduction changeover switches (278) to (27D). As a result, the input signal is divided and synchronized as shown in FIG.
” is supplied to A-D and recorded on tape (29).

Furthermore, during playback, the signals from head chips A to D are taken out to [E amplifiers (30A) to (300) through switches (27A) to (27D), respectively, and these amplifiers (
Signals from 30A) to 30D are supplied to a channel synthesis circuit (33) through data and clock recovery circuits (31A) to (3111) and time base correctors (32A) to (32D), respectively. The combined signal is then supplied to a DA converter (36) through a channel decoder (34) and an ECC decoder (35), and the original video signal is restored and taken out to an output terminal (37).

In this way, even in this device, recording and reproduction can be performed using the integrated head. You can also wear this outfit.

〔Effect of the invention〕

According to this invention, all signals can be recorded using an integrated head by dividing and synchronizing recording signals, thereby eliminating problems such as poor bearings between heads and problems with track linearity. This makes it possible to achieve good recording with a simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an example of the present invention, FIGS. 2 and 3 are illustrative diagrams, FIGS. 4 and 5 are illustrative diagrams of other examples, and FIGS. 6 and 7. FIG. 1 is a diagram for explaining a conventional technique. (1) is an input terminal, (2) is a recording circuit, (31 (5) is a recording amplifier, (4+(12) is a delay circuit, (al (7)
1 (13) is a switch, (8) is a drum, (9) is a tape, (10) and (11) are a playback amplifier, (14) is a playback circuit, (15) is an output terminal, and A and B are heads. .

Claims (1)

[Claims] A recording signal corresponding to one revolution of the drum is divided into n (an integer of 2 or more), these divided signals are synchronized, and the synchronized signals are integrated into n chips with n steps. A helical scan type recording device configured to simultaneously record the n-divided signals onto a recording tape having a wrap angle of 360/n degrees.