JPS61144753A - Recorded magnetic tape - Google Patents

Abstract

PURPOSE:To track an audio track and to reproduce a sound of good quality by prescribing a specific value as the distance to a control signal pulse on the basis of the audio track. CONSTITUTION:An audio track 18 of a CH1 is formed by an audio head 13 of the CH1 and a track 19 of a CH2 is formed by a head 14 similarly; and they are superposed upon video tracks 2 and 3 of the CHs 1 and 2 respectively. Then, the distance from the 180 deg. exit of the audio track 19 to the control signal pulse 8 is set to a specific value for the compatibility of recorders instead of a conventional X value based upon the video tracks. Consequently, when a tape whose Y value is prescribed is reproduced, the audio tracks are tracked to reproduce a sound of good quality.

Description

[Detailed description of the invention] Industrial applications The present invention relates to recorded magnetic tape.

In prior art co-directional video tape recorders, compatibility between different devices must be ensured.

One of the most important points in ensuring this compatibility is the tape format.

The tape format of the - method is standardized as shown in FIG. In the figure, 1 is a magnetic tape, which runs in the direction of the arrow. 2 is C) 11 video tracks,
Reference numeral 3 designates a CH2 video track, which is formed by a CH1 video head 4 and a CH2 video head 5, which scan in the direction of arrow B, and is inclined at a predetermined angle θ with respect to the longitudinal direction of the magnetic tape 1. is recorded.

A control track 6 is formed along the reference edge 1a of the magnetic tape 1, and a control signal pulse 8 to be reproduced by the control head 7 is recorded.

X is the distance in the tape longitudinal direction from the 180° exit of the video track 5 of CH2 to the control signal pulse 8, and is set to a predetermined value.

This xi determines the position of the video head 5 with respect to the video track 2, and ensures compatibility between different models.

Recently, a system has been put into practical use that records and plays back high-quality audio signals while maintaining compatibility with conventional models for playing back video signals. This method uses a tape guide drum 10 shown in FIGS. 5 and 6. The tape guide drum 10 includes a fixed drum 11 and a rotating drum 12 that rotates in the direction of arrow C. Rotating drum 12
In addition to the above-mentioned video heads 4 and 5, the CHI audio head 13 and the CH2 audio head 14 are installed.
are positioned ahead of the video head 4.5 by an angle θ in the direction of rotation of the rotary drum 12, and the video heads 4,
It is installed at a position that is dimension d lower than 5. The magnetic tape 1 is guided by guide balls 15 and 16 and runs along the periphery of the guide drum 10 in six directions indicated by arrows.

In this system, the tape format is such that the audio heads 13 and 14 form audio tracks 18 and 19 for CH1 and CH2, and the video heads 4 and 5 form video tracks 2 and 3 superimposed on these, as shown in FIG. Form. The width W1 of the audio track 18,19 is narrower than the width W2 of the video track 2.3. Furthermore, a certain degree of tolerance was allowed for the position of audio track 18.19 within video track 2.3.

In the above tape format as well, the distance to the control signal pulse 8 is defined based on the 180° exit position of the video track 5 of CH2, as in the conventional case. Therefore, also in video tape recorders, the mounting position of the control head has been determined in accordance with the above-mentioned X value.

Problems to be Solved by the Invention In the above-mentioned systems, generally more emphasis is placed on sound quality. On the other hand, if the audio track width is narrower than the video track width and the tracking is shifted due to compatibility between video tape recorders and the S/N ratio decreases, the audio will be affected more than the image on the monitor.

For this reason, if the tape format is standardized as described above and the video tape recorder is also adjusted for compatibility based on the video track, emphasis will be placed on when the video and audio output levels do not match for compatibility reasons. There is a problem in that the S/N ratio of the normal audio signal may decrease.

Means for Solving the Problems In view of the above, the present invention defines the distance from the audio track to the control signal pulse as Y.

As a result, for the video tape recorder, the position of the control head is compatiblely adjusted based on the Y value. As long as the above-mentioned video tape recorder plays back a magnetic tape with a defined Y value, the audio track can be tracked and high-quality audio can be played back.

Example Next, each embodiment of the present invention will be described.

FIG. 1 shows an embodiment of a recorded magnetic tape 20 according to the present invention. In the figure, parts corresponding to those shown in FIG. 4 are given the same reference numerals.

18 is a CH1 audio track formed by the CHI audio head 13, and 19 is a CH2 audio track.
This is an audio track of CH2 formed by the audio head 14 of C141 and video track 2.3 of CH2, respectively.

The control track 6 is located at the reference edge 20 of the magnetic tape 20.
It is formed along a.

In order to ensure compatibility between video tape recorders, a Y value is set instead of the conventional X value.

This Y value is 180 for audio track 19 of CH2.
°This is a newly set value based on the exit, and the CH
This is the distance in the longitudinal direction of the tape from the 180° exit of the second audio track 19 to the control signal pulse 8.

Yll! tape format as above. In accordance with the newly defined standardization, the position of the control head 7 of the video tape recorder 21 has been changed to 180° of the audio head 14 of CH2 of the tape guide drum 10, as shown in FIG. Based on the rotation position,
This results in a configuration adjusted so that the distance along the 1-path is Y.

As a result, when the magnetic tape 20 is played back by the video tape recorder 21, the audio tracks 18 and 19 are tracked, and aurally good sound is played back.

Furthermore, considering the tape format shown in FIG. 1, video tracks 2.3 are also well tracked and good images are reproduced. Furthermore, it goes without saying that the compatibility of the magnetic tape 20 between video tape recorders adjusted as described above is guaranteed.

Further, the above Y value may be defined based on the 180° exit of the CH1 audio track 18 instead of the 180° exit of the CH2 audio track 19.

FIG. 3 shows another embodiment of the recorded magnetic tape of the present invention. In the figure, parts corresponding to those shown in FIG. 1 are designated by the same reference numerals, and their explanations will be omitted.

In the recorded magnetic tape 20, the Y' value is defined with reference to an arbitrarily determined position in the middle of one audio track of CH2. When the Y' value is defined in this way, the video tape recorder starts recording the tape from a predetermined rotational position of the audio head 14 with the control head 7 positioned at CH2, as shown in FIG. The configuration is adjusted so that the distance along the bus is Y', and is compatible with the conventional method using the X value as a reference.

Also, instead of audio track 19 of CH2, CH1
An arbitrarily determined position on the audio track 18 may be used as a reference.

Furthermore, the present invention is not limited to the method of overlapping recording of a video signal on an audio track as in the above two embodiments, but the present invention is not limited to the method of overlapping recording of a video signal on an audio track as in the above two embodiments.
This method can also be applied without any inconvenience to the recording method.

When the magnetic tape 20 whose Y' value is defined as described above is played back by the video tape recorder described above, the audio tracks 18 and 19 are well tracked, and sound of good quality is played back.

Effects of the Invention As described above, according to the recorded magnetic tape of the present invention, the distance to the control signal pulse to ensure compatibility between video tape recorders is determined based on the audio track instead of the video track. Since this tape is specified as a standard, when used in a video tape recorder that has been adjusted to support this system, it will be able to accurately track the audio track, reproduce good audio, and improve the sound quality. It has the feature of being able to meet the requirement of 1 m.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the tape format of one embodiment of the recorded magnetic tape of the present invention, and FIG. 2 is an example of a video tape recorder in which the position of the control head is adjusted to correspond to the tape format of FIG. 1. FIG. 3 is a diagram showing the tape format of another embodiment of the recorded magnetic tape of the present invention, FIG. 4 is a diagram showing the tape format of a conventional magnetic tape, and FIGS. 5 and 6 are diagrams showing the tape format of a conventional magnetic tape. FIG. 3 is a diagram showing tape guide drums that respectively perform multiple recording. 2.3... Video track, 4,5... Video head, 6... Control track, 7... Control head, 8... Control signal pulse, 10...
... Tape guide drum, 13.14 ... Audio head, 15.16 ... Guide ball -118, 19
. . . Audio track, 20 . . . Multi-recorded magnetic tape, 21 . . . Video tape recorder. Patent applicant: Victor Japan Co., Ltd. Figure 1 Figure 2 Wataru

Claims (1)

[Claims] A recorded magnetic tape in which a video track on which a video signal is recorded and an audio track on which an audio signal is recorded are formed inclined at a predetermined angle with respect to the longitudinal direction, and control signal pulses are recorded along the side edges. . A recorded magnetic tape, characterized in that the distance from the audio track to the control signal pulse is defined to a predetermined value with the audio track as a reference.