JPH0442468A - Tape pattern for magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain high picture quality and high sound quality by providing specific first and second tape patterns, and attaching interchangeability between the first and second tape patterns. CONSTITUTION:Linear tracks 11, 12 are formed at both terminal parts in the width direction of a magnetic tape 3 in the first tape pattern, respectively, and a video track 13 is formed in a center part. Also, in the second tape pattern, a control track 21 is formed at the terminal part on one side in the width direction, and a guard band 22 is formed at the terminal part on the other side linearly, and a video track 23 is formed in the center part, and a new install track 27 is formed at the terminal part on the other side as the extension part of the video track 23. The interchangeability is attached between the first tape pattern and the second tape pattern. Thereby, it is possible to attain picture quality and sound quality higher than ever as keeping the interchangeability with a conventional format.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is for recording recording signals such as audio signals or video signals in a magnetic recording/reproducing apparatus such as a VTR equipped with a helical scan type rotating magnetic head drum. The present invention relates to a tape pattern of a magnetic recording/reproducing device that records each track on a magnetic tape as a medium.

[Conventional technology]

Conventionally, a VH8 type VTR as a magnetic recording/reproducing device is generally equipped with a video head which is a rotating head, an audio head which is a fixed head, and a control head, and is used as a recording medium in the tape pattern shown in FIG. Recording signals are recorded on a magnetic tape 30 (hereinafter referred to as tape).

In the tape pattern described above, an audio signal as a recording signal is usually recorded as an audio track 31, which is a linear track, on one end of the tape 30 in the width W direction by an audio head, and a control head As a result, a control signal as a recording signal is recorded on the other end of the tape 30 in the width W direction as a control track 32 which is a linear track, and then a control signal as a recording signal is recorded on the center of the tape 30 by the video head. The video signal is recorded as a video track 33 in a state tilted at a predetermined track angle θ with respect to the longitudinal direction of the tape 30.

[Problem to be solved by the invention]

However, in the conventional tape pattern described above, in order to achieve high sound quality, HtF tape, which has high fidelity for audio reproduction, is used.
When multiplexing an audio signal by deep recording onto a video track on which a video signal is recorded, the HiFi audio signal and video signal interfere with each other, so it is necessary to fully bring out the characteristics of each signal. Moreover, it is difficult to use PCM (Puls'e-C
ode Modulati.

n) has the problem of being difficult to apply.

[Means to solve the problem]

In order to solve the above-mentioned problem, the tape pattern of the magnetic recording and reproducing device according to the present invention records recording signals such as audio signals, control signals, or video signals as respective tracks on a magnetic tape as a recording medium. The following measures are taken in the tape pattern of the magnetic recording/reproducing device.

That is, linear tracks are formed at both ends of the magnetic tape in the width direction, while video signals are recorded in the center of the magnetic tape, and predetermined tracks are formed in the longitudinal direction of the magnetic tape. a first tape pattern in which an angled video track is formed; and a second tape pattern in which one linear trunk of the first tape pattern is replaced as a new track in an extension of the video track; The first tape pattern and the second tape pattern are compatible.

[For production]

According to the above configuration, the first tape pattern and the second tape pattern
Since the two types of tape patterns are compatible, these two types of tape patterns can be used in common on one device, and furthermore, the first tape pattern can be used as a conventional tape pattern. While it is a pattern,
By recording the PCM audio signal on the new track of the second tape pattern and changing the frequency allocation of the video signal of the second tape pattern, it is possible to achieve even higher image quality while maintaining compatibility with the conventional format. It becomes possible to achieve higher sound quality.

[Example] An example of the present invention will be described below based on FIGS. 1 to 4. In this embodiment, for convenience of explanation, the first and second tape patterns according to the present invention will be described with recording signals recorded in the standard recording mode.

The magnetic recording/reproducing apparatus according to this embodiment is shown in FIGS. 2 and 4.
As shown in the figure, 180° is placed on the rotating magnetic head drum 1.
It includes two rotary heads 2a and 2b spaced apart from each other, a control head that is a fixed head (not shown), and an audio head.

Then, by each of the heads, two of the first tape pattern shown in FIG. 1 and the second tape pattern shown in FIG.
Recording signals are recorded on the tape 3 in a regular tape pattern. Incidentally, the total width W of the tape 3 is 1
2.65 mm (A″), and rotating helad 2a.
The track angle θ of the track formed on the tape by 2b is 5°58'9.9#.

The first tape pattern is as shown in FIG.
A control track 11, which is a linear track, is formed at one end in the width W direction of the tape 3, and an audio track 12, which is a linear track, is formed at the other end in the width W direction of the tape 3. , and the center part of the tape 3 has a radius Wl of 10.
Video track 13 of the 07th cabinet has been formed.

The control track 11 receives a control signal of 0.75 as a recording signal by the control head.
When the magnetic recording and reproducing apparatus reproduces the tape 3, the control signal is reproduced by the control head, so that the rotary head 2
a and 2b trace the video track 13 accurately.

In the audio track 12, an audio signal as a recording signal is recorded with a width W of one cabinet by an audio head.

The video track 13 records five video signals as recording signals by the rotary head 2a or the rotary head 2b.
81! The width W4 is m, and the length Ll is recorded as a winding angle of 180° around the rotating magnetic head drum 1. Further, overlaps 14 and 15 are provided at both ends of the video track 13 in the longitudinal direction, respectively.
The lengths L2 and L of these overlaps 14 and 15 are each formed to have a wrapping angle of about 5 degrees, and the width W from the end of the overlap 14 to the end of the overlap 15 is 10.60 mm. has been done.

The length L4 in the width W direction from the center point A of the video track 13 to the end of the video track 13 is 5.
．． 035 cm, and the center point A of video track 13
The length from the end of the tape 3 where the control track 11 is formed is 6.2 mm, and the length from the end of the overlap 15 to the end of the tape 3 where the audio track 12 is formed is 6.2 mm. The width W is 1.15 mm.

Mata, the rotation gear 2a in the above first tape pattern
Recording of the video signal onto the tape 3 by the tape 2b is performed with the tape 3 being slidably wound around the rotating magnetic head drum 1 by about 190 degrees, as shown in FIG. At this time, the tape 3 is running in the B direction, and the rotating heads 2a and 2b are scanning in the C direction, with the head scanning direction being in the forward direction with respect to the tape running direction. Furthermore, the direction of the head scanning with respect to the tape running is as follows:
It is not particularly limited to the forward direction (the reverse direction is also acceptable.

First, the rotary head 2a rotates for 14 minutes with an overlap of about 5 degrees from the sliding start point between the tape 3 and the rotary magnetic head drum 1, and then rotates by 180@ to record the video track 13 on the tape 3. and then about 5°
Rotate for 15 minutes and reach the sliding end point.

Next, as the tape 3 travels in the B direction, the rotating head 2
b forms the video track 13 on the horizontal part of the video track 13 formed by the rotary head 2a in the same manner as the rotary head 2a, and then the video track 13 is formed by the rotary heads 2a and 2b. The formation of
It is performed repeatedly in sequence.

The second tape pattern is as shown in FIG.
At one end in the direction of the radius W, a width W1 . While the control track 21 with a width of 0.75 mm is formed, at the other end of the chi 130 in the width W direction,
The guard band 22 is formed linearly. In addition, in the center of the tape 3, a video track 23 with a width Wl of 10.07 mm is installed at a track angle θ with respect to the longitudinal direction of the tape, similar to the first tape pattern described above. is formed.

Similar to the first tape pattern, the video track 23 is formed by the rotating head 2a or the rotating head 2b.
The video signal as a recording signal has a radius of 58-0 W14, and the length L I+ is recorded as a winding angle of 180° around the rotating magnetic hent drum 1. Also, video track 2
The length Lla in the direction W from the center point A' of the video trunk 23 to the end of the video track 23 is 5.035 mm. The length I-+s to the end of is 6.2M.

An overlap 24 having a length of 1-(wrapping angle of about 5 degrees) is provided at one end of the narrow track 21 of the video track 23, while an overlap 24 of about 5 degrees is provided as an extension of the video track. A new track 27 is formed at the other end of the new track 27 via a guard band 26, and the guard band 26 of the new track 27
An overlap 25 having a length L12 and a wrap angle of about 5 degrees is provided at the end portion where the wrap is not provided.

The length of the new track 27 is set to 156 in terms of the angle of wrapping around the rotating magnetic head drum 1, and the length of the guard band 26 is Ll? is the wrapping angle around the rotating magnetic head drum 1 and is set to 4°.

Also, is the length of the newly installed track 27 and the guard band 26 l&Ll? Therefore, the wrapping angle of the tape 3 on the rotating magnetic head drum 1 in the second tape pattern is L16+L17=15@+4'' compared to the first tape pattern.
= 19@ increase. Therefore, the width WI% from the newly installed track 27 to the guard band 26 is W
+s=Wll X(19”/180°)=10
．． 07 X (19@/180°) = 1.06
(Kaku) Then, the width W+3 of the above guard band 22 is W1s=
W& -W+s = 1.15-1.06 = 0.09 (Peng).

Further, the rotary head 2a in the second tape pattern
Recording of recording signals onto the tape 3 by the tape 2b is performed with the tape 3 being slidably wound around the rotating magnetic head drum 1 at an angle of approximately 209 degrees, as shown in FIG. Note that the running direction of the tape 3 and the rotating heads 2a, 2
The scanning directions of b are the B direction and the C direction, respectively, similarly to the first tape pattern.

First, the rotary head 2a rotates from the sliding start point D' between the tape 3 and the rotary magnetic head drum 1 for 24 minutes with an overlap of about 5 degrees, and then rotates 180'' to record the video track on the tape 3. 23, then approximately 41
After forming the guard band 26 of 15°, a new track 27 of 15° is formed, and then an overlap 27 of about 5° is formed.
After rotating for 5 minutes, the sliding end point E' is reached.

Next, as the tape 30B travels, the rotating head 2
b indicates the video track 23 formed by the rotating head 2a, the guard band 26, and the newly installed track 27.
A video track 23, a guard band 26, and a new track 27 are formed in the same way as the rotating head 2a, and then the rotating heads 2a and 2b are
The formation of the video trunk 23, the guard band 26, and the new track 27 is sequentially and repeatedly performed.

In the above configuration, the first tape pattern is formed to be the same as a conventional tape pattern, while the second tape pattern has a wrapping angle of the tape 3 around the rotating magnetic head drum 1 that is different from that of the first tape pattern. By increasing 19 degrees compared to the audio track 12 of the first tape pattern.
The tape pattern has been replaced with a newly installed track 27 and a guard band 26.

Next, connect the PC to the newly installed track 27 of the second tape pattern.
Recording of the M audio signal will be explained below.

This magnetic recording and reproducing apparatus performs recording using two heads (2CH") of rotating heads 2a and 2b, and the diameter φ of the rotating magnetic head drum 1 is 62 mm, and the sampling frequency of the PCM audio signal is 32 kHz. If the number of quantization bits is set to 12 bits and the redundancy level is set to 50%, the recording focus rate of the above PCM audio signal on tape 3 is: 32 (kHz) x 12 (bits) x 1.5
X 2 (CI) = 1.152 (Mbps), and the shortest recording wavelength λ of the PCM audio signal is λ-(v/f) x Ctx/360') x
n - (1) ■ = Relative speed f: Recording frequency α: Wrapping angle n: Number of rotating heads of the rotating magnetic head drum, and the relative speed V is: Vζ62 (Peng) x 30 (rps) Xπ = 5
．． 8 (Rin/s), and since the recording frequency f can express 2 bits with one wavelength, f = 1.152 (Mbps) / 2 (bit
) = 0.576 [Mbps/bit), the wrapping angle α is 15°, and the number of rotating heads n is 2, so from the above equation (1), the shortest recording frequency λ is: λ = (5, e, / 0.576 ) x (15° / 3
60@”) X2”, 0.85 (am), that is, 1
．． The shortest recording wavelength λ when recording a 152 Mbps PCM audio signal is 0.85 tm, which is a value that can be sufficiently recorded using current high-density recording technology.

In this embodiment, the video track 23 of the second tape pattern is formed as the same track as the video track 13 of the first tape pattern, but the track patterns of the first tape pattern and the second tape pattern are different from each other. It is also possible to change the frequency allocation of the second tape pattern while keeping it the same.

From the above, while the first tape pattern is a conventional tape pattern, the PCM audio signal is recorded on the newly installed track 27 of the second tape pattern, and the frequency allocation of the video signal of the second tape pattern is changed. This makes it possible to achieve even higher image and sound quality while maintaining compatibility with conventional formats.

Furthermore, by providing the magnetic recording/reproducing apparatus according to this embodiment with another set of electromagnetic conversion systems such as a magnetic head, a rotary transformer, and a head amplifier, a first tape pattern compatible with the VH3 system and a first tape pattern compatible with high-definition system can be created. It is also possible to share two tape patterns on one device.

〔Effect of the invention〕

As described above, the tape pattern of the magnetic recording and reproducing device according to the present invention has
A first tape pattern in which linear tracks are formed respectively, and a video track recording a video signal and having a predetermined track angle with respect to the longitudinal direction of the magnetic tape is formed in the center of the magnetic tape. and,
One linear track of the first tape pattern has a second tape pattern replaced as a new track in an extension of the video track, and the first tape pattern and the second tape pattern are compatible. This is the configuration that has.

As a result, two types of tape patterns, the first tape pattern and the second tape pattern, can be used in common on one device.Furthermore, while the first tape pattern is a conventional tape pattern, the second tape pattern can be used in common. By recording the PCM audio signal on the new track of the tape pattern and changing the frequency allocation of the video signal of the second tape pattern, it is possible to maintain compatibility with the conventional format.
This has the effect of making it possible to achieve even higher image quality and higher sound quality.

It is something.

FIG. 1 is a recording format of a magnetic tape showing a first tape pattern.

FIG. 2 is a plan view showing the rotating magnetic head drum in the first tape pattern.

FIG. 3 is a recording format of a magnetic tape showing a second tape pattern.

FIG. 4 is a plan view showing the rotating magnetic head drum in the second tape pattern.

FIG. 5 shows a conventional magnetic tape recording format.

3 is a magnetic tape, 11 and 21 are control trunks (
12 is an audio track (linear track), and 27 is a newly installed track.

Patent applicant Sharp Corporation

[Brief explanation of drawings]

Claims (1)

[Claims] 1. A tape pattern of a magnetic recording and reproducing device that records recording signals such as audio signals, control signals, or video signals as respective tracks on a magnetic tape as a recording medium, comprising: Linear tracks are formed at both ends in the width direction, while a video track recording video signals and having a predetermined track angle with respect to the longitudinal direction of the magnetic tape is formed in the center of the magnetic tape. and a second tape pattern in which one linear track of the first tape pattern is replaced as a new track in an extended portion of the video track, and the first tape pattern is different from the first tape pattern. The second tape pattern is a tape pattern of a magnetic recording/reproducing device characterized by having compatibility.