JPH03272011A - Head device - Google Patents

Abstract

PURPOSE:To suppress the disturbance due to a newly recorded pattern even in the case of deviation of this pattern to the right or the left from an already recorded pattern by mounting reproducing heads, whose track width is equal to the recording track width, and reproducing heads, whose track width is wider than the recording track width, on the same mobile elements. CONSTITUTION:In a video and sound signal recording and reproducing device like a VTR, positions of mobile elements 8 and 9 are controlled by signals reproduced by first heads B and B' having the same track width as the recording track width to reproduce signals by second heads C and C' which are mounted on the same mobile elements 8 and 9 with the same track centers as first heads B and B' and have the track width wider than the recording track width. Thus, signals on all effective tracks can be reproduced even in the case of editing or joints of consecutive recording.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a head device that can be used in a video and audio signal recording and reproducing device such as a VTR.

BACKGROUND OF THE INVENTION In recent years, video and audio signal recording and reproducing devices such as VTRs have been designed to have higher densities, and in addition to narrower tracks, azimuth angles have been established between the heads of adjacent tracks, and guard bands have been installed between recording tracks. A so-called azimuth record, which is not set, is used. This recording pattern is shown in FIG. 3, and its enlarged views are shown in FIGS. 4 and 5.

In narrow track recording, it is not always possible to reproduce the pattern exactly as recorded due to linearity differences and tracking deviations during reproduction compatibility. In order to obtain sufficient reproduction output even in such cases, the width of the reproduction head is often made wider than the width of the recording track. By doing this, in FIG. 4, even if the playback head 1 does not land on the center of the top track 2 as shown in (b), but deviates as shown in (a) or (C), Can pick up all signals. Even when the head 1 rides on adjacent tracks on both sides, the signals from these tracks are attenuated because of the azimuth angle.

In addition, in a VTR that performs noiseless slow motion or high-speed playback, a playback head is mounted on a movable element such as a piezo element, and the head scans the recording track on-track according to the playback speed. In this case, even if the reproducing head is not necessarily wide, sufficient reproducing output can be obtained as long as the movable element follows the curve of the track.

Problem to be Solved by the Invention However, in a VTR that performs editing and splicing operations, the splices where new recordings are made in low recording areas do not necessarily follow the original pattern, and as shown in Figure 5, either the left or the right A shift occurs.

In FIG. 5, 3 is a previously recorded edge pattern, and 4 is a newly recorded pattern. FIG. 5 shows a state in which the newly recorded pattern 4 is shifted to the right. In this case, when playing back with wide head 1, if head 1 is in position (b) or (C), it will be able to pick up all the signals of the new pattern, but if head 1 is in position (a), it will be able to pick up all the signals of the new track. I can't pick them all up. Furthermore, head 1 is (a)+
Regardless of the position of (b) + (c), in addition to the effective signal of track 5, the signal of old track 8 is mixed in as interference because it has the same azimuth. In order to obtain sufficient performance even in the presence of such interference, it is necessary to make the effective signal component sufficiently large, and for this purpose it is necessary to pick up all the signals of track 5.

In addition, even if a head with approximately the same width as the track width is placed on a movable element and controlled to follow the recording track pattern, it is impossible to rapidly follow the recording track pattern, and the It is not possible to immediately fly to track 5, and the signal will be interfered with by track 6 without picking up all of the signals from track 5. When a head with a width wider than the track width is mounted on the movable element, there is no change in the playback output even if head 1 shifts in the track width direction as shown in Figure 4 (a) and (C), and the head 1 always at the center of the track (b)
difficult to control.

The present invention solves these problems and provides a device that enables noiseless special reproduction using a movable element.

Means for Solving the Problems In order to solve the above problems, the head device of the present invention includes, on the same movable element, a first head having a track width approximately equal to the recording track width, and a first head having a width wider than the recording track width. It is equipped with a second head having the following functions.

The position of the movable element is controlled by the signal reproduced from the first head, which has a width approximately equal to the width of the recording track. By reproducing the signals from the second head having the width, it is possible to reproduce the signals of all effective tracks even at the joints of editing and splicing.

Embodiment FIG. 1 shows a head arrangement diagram of an embodiment of a head device in a VTR according to the present invention, and FIG. 2 shows a block diagram of an embodiment of a recording/reproducing apparatus using the head device according to the present invention. Detailed explanation of. Figure 1(a) is a plan view;
FIG. 1(b) is a front view.

In FIG. 1, A and A' are recording heads, BIB' is a first reproducing head having approximately the same width as the recording track, and C9
C1 is a second reproducing head having a width wider than the recording track, and heads B and C, B' and C' are mounted on the same movable elements 8 and 9, respectively. Also, head A,
B, azimuth angle between 0 and heads A', B', C
The azimuth angles between ' are the same, heads A and A', B and B'
The azimuth angles of C and C' are different. recording head A,
If the width of A' is narrower than the track pitch, a guard band will be formed between the tracks, and if it is equal to or wider than the track pitch, a guard band will not be formed.

When recording, editing, or splicing is performed using a head configured in this way, the recording pattern will be as shown in Figures 3 to 5 (
(Here, the state without guard band is shown).

The present invention will be described in detail below with reference to FIG.

In FIG. 2, a signal applied to a terminal 10 is transmitted to a recording signal processing circuit 11. Recording head 13 via recording amplifier 12
(Recording head A in Fig. 1.

A') is recorded on the tape 14.

During playback, the playback head 15 (first playback head B, B' in FIG. 1), which has approximately the same width as the recording track mounted on the movable elements 8 and 9, reproduces the sound, and the head amplifier 16 amplifies the sound. The signal is guided to an envelope detector 17, and its output level is detected. Based on the output of the envelope detector 17, a movable element drive circuit 18 controls the movable elements 8 and 9 so that the output of the reproducing head 15 is maximized. Since the width of the reproducing head 15 is approximately the same width as the recording track, the output decreases even if the output deviates from the maximum position to the left or right. can be controlled.

As shown in FIG. 1, the reproducing head 9 (second reproducing heads C, C' in FIG. 1), which has a width wider than the recording track, is connected to the reproducing head 15 (first reproducing head B, in FIG. 1). B'
) are mounted on the movable elements 8 and 9 so that their centers almost coincide with each other, so when the playback head 15 traces just above the recording track, the playback head 19 scans so that the recording track is in the center. do. That is,
The position is shown in (b) in FIGS. 4 and 5. Therefore, as shown in FIG. 5, even if the track is shifted due to editing or splicing, all effective signals can be picked up within a certain range of the shift. If the deviation is larger than that, it will not be possible to pick up all the effective signals, but the allowable limit for this deviation is
The ratio of useful signal to interference is brought to a point where it is acceptable. The signal reproduced by the reproduction head 19 is amplified by the head amplifier 20, processed for reproduction by the reproduction signal processing circuit 21,
It is output from the output terminal 22.

In addition, during slow motion or high-speed playback, the movable elements 8 and 9 are controlled based on the output of the playback head 15, so that the playback head 15 traces the recorded pattern, and the playback head 19 is able to perform a noiseless operation. I can get a signal.

In the above, we have explained the case where an azimuth angle is set between adjacent tracks to form a pattern without a guard band. However, this is not limited to such a pattern, and the case where a guard band is provided without setting an azimuth angle is explained. The present invention is equally effective.

In addition, heads A, A', B, in FIG.
The present invention can also be applied to a head device in which each of B'c and c'' is composed of two or more pairs of heads, and each pair is configured to have an azimuth angle.

Effects of the Invention As described above, according to the present invention, even if a newly recorded pattern crosses the already recorded pattern to the left or right at an editing point or splicing point, the interference can be minimized. It also enables noiseless slow motion and high-speed playback.

[Brief explanation of drawings]

FIG. 1 is a head arrangement diagram showing an embodiment of a head device according to the present invention, and FIG. 2 is a head arrangement diagram showing an embodiment of a recording/reproducing apparatus using the head device according to the present invention.・
... Recording track, 8, 9... Movable element, 1
3... Recording head, 15... First playback head, 19... Second playback head, 12.20...
regenerative equalizer, 17...envelope detector,
18...Movable element drive circuit, 21...Reproduction signal processing circuit.

Claims (2)

[Claims] (1) A head device characterized in that a first head having a track width approximately equal to the recording track width and a second head having a width wider than the recording track width are mounted on the same movable element. (2) The head device according to claim 1, wherein the movable element is controlled based on the output of the first head, and the signal is reproduced by the second head.