JPS61139905A - Rotary magnetic head device of digital video/audio recording device - Google Patents

Abstract

PURPOSE:To use in common a channel of a rotary transformer by providing a rotary magnetic head for preceding reproduction which precedes a rotary magnetic head for recording, and switching each output of this head and a rotary magnetic head for confirming reproduction. CONSTITUTION:A rotary magnetic head A (A1-A4) for preceding reproduction scans a sound track part of an inclined track of a magnetic tape and reproduces its digital sound signal. The head A precedes by a prescribed angle against a rotary magnetic head R (R1-R4) for recording so that the maximum time required for a signal processing of the digital sound signal which has been reproduced by the head A can be secured. Each reproducing signal from the head A and a rotary magnetic head C (C1-C4) for confirming reproduction is amplified 2, 3, respectively, and thereafter, supplied to changeover switches 4, 5, and supplied to a primary coil 7a of a rotary transformer 7 of a channel in which an output of one of the switches 4, 5 exists by a controlling circuit 6. In this way, the transformer 7 can be used in common, and the signal processing can be executed without increasing the number of channels of the rotary transformer.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotating magnetic head device for a digital video/audio recording device suitable for use in digital VTRs (video tape recorders).

[Prior Art] ゛In a conventional component (4:2:2) type digital VTR, a luminance signal, a red difference signal, and a blue difference signal are digitally processed at sampling frequencies with a ratio of 4:2:2, respectively. The multiplexed digital video signal is processed together with the digital audio signal and supplied to a rotating magnetic head to create a video track portion Tv on the magnetic tape TP, as shown in FIG. Recording was performed so as to form an inclined track T consisting of an audio track portion TA at the end thereof.

In FIG. 5, a indicates the tape running direction, and b indicates the running direction of the rotating magnetic head.

In this case, the rotary magnetic head device includes two pairs of two-channel recording rotary magnetic heads with a 180° angle division and a 180°
It has a pair of two-channel reproducing rotary magnetic heads divided by degrees, and during recording, the recording signals of the inclined tracks are monitored and reproduced by the reproducing rotary magnetic heads for confirmation.

[Problem that the invention seeks to solve]

By the way, in such a conventional digital VTR, the digital audio signal recorded in the audio track section of the inclined track is played back and subjected to signal processing such as rewriting data of a specific channel, overdubbing, level conversion, etc. , it is necessary to re-record to the original track. For this purpose, in addition to the above-mentioned rotary magnetic heads, the rotary magnetic head device needs to be provided with a pair of 2-channel advance reproduction rotary magnetic heads split at an angle of 180° for reproducing digital audio signals. . Therefore, it is necessary to change the 8-channel rotary transformer to a 12-channel rotary transformer, but in doing so, the shape of the rotary transformer becomes larger, which also leads to an increase in the price of the rotary transformer, and the rotary transformer becomes larger. The drawback is that it is difficult to balance the drum and the rotating drum is likely to vibrate.

In view of this, the present invention provides a recording rotary magnetic head for recording digital video signals and digital audio signals by forming an inclined track on a magnetic tape consisting of a video track section and an audio track section at the end thereof, and a recording rotary magnetic head for recording digital video signals and digital audio signals on a magnetic tape. In a rotating magnetic head device of a digital video/audio recording device having a rotating magnetic head for confirming and reproducing a signal recorded so as to form an inclined track at the time of recording, the number of channels of the rotating transformer is not increased. This paper attempts to propose a method in which digital signals recorded in the audio track section of the inclined track on a magnetic tape can be reproduced for signal processing and then recorded on the original inclined track. It is.

[Means for solving problems]

The present invention provides a recording rotary magnetic head R (R1-R4) for recording digital video signals and digital audio signals so as to form an inclined track T consisting of a video track portion Tv and an audio track portion TA at the end thereof on a magnetic tape TP. and a rotating magnetic head C (C1 to C4) for confirming and reproducing a signal recorded so as to form an inclined track T on a magnetic tape TP during recording. A rotary magnetic head for advance reproduction reproduces a digital audio signal recorded on an audio track portion TA in an inclined track T on a magnetic tape TP prior to a rotary magnetic head R for recording (R1-R4). A (As-A4) and a rotating magnetic head C for confirmation playback (
01 to C4) and a rotary magnetic head A for advance reproduction (A1-
The apparatus is characterized in that it has a switching circuit (4), +5) which switches each reproduction signal of A4) and supplies it to the rotary transformer (7).

[Effect]

According to the present invention, the digital audio signal recorded on the audio track portion T in the inclined track T on the magnetic tape TP is processed by the rotating magnetic head A (A1-A4) for advance reproduction for signal processing. It is possible to reproduce the data and record it on the original inclined track T using the recording rotary magnetic disc R (R1-R4).

(Embodiment) An embodiment of the present invention applicable to the digital VTR of the above-mentioned component (4:2:2) system will be described in detail below with reference to the drawings. The main part of one embodiment of the magnetic head device is shown, and RD is a rotating drum that together with a fixed drum (not shown) constitutes a tape guide drum, and the magnetic tape TP is wound around the tape guide drum at an angle of, for example, 240°. The winding is guided diagonally by the corner.G1 and G2 are a pair of guide balls for determining the angle of winding of the magnetic tape TP on the tape guide drum.C is a rotating magnetic ball. d indicates the direction of rotation of the head, and d indicates the running direction of the magnetic tape TP.

R (R1, R2; R3, R4) is a pair of two-channel recording rotary magnetic heads divided at an angle of 180°, and the inclined tracks Ta + Tb shown in FIG. , the inclined tracks Tc and Td shown in FIG. 5 are recorded and formed by magnetic heads R3+R4. Therefore, a digital audio signal is recorded on the audio track section TA of the inclined track T by the magnetic heads R1 to R4, and then a digital video signal is recorded on the video track section Tv.

C (CI, C2: C3, C4) is a pair of 2-channel rotating magnetic heads for normal playback and confirmation playback with a 180° angle division. During recording or normal playback, the magnetic heads CI and C2 tilt as shown in Fig. 5. Truck Ta.

Tb is scanned to reproduce the recorded signal, and the magnetic node Ci is
+C4 scans the inclined tracks Tc and Td in FIG. 5 and reproduces the recorded signal.

A (AX, A2; A3.A4) is a pair of 2-channel rotating magnetic heads for advance reproduction with a 180° angle division.
The magnetic heads A1*A2 scan the audio track portion T^ of the inclined track Ta+Tb in FIG. 5 and reproduce the digital audio signal, and the magnetic heads A3°A4
Audio track section TA of inclined track Tc + Td in the figure
to reproduce the digital audio signal. In order to secure the maximum time necessary for signal processing such as rewriting data of a specific channel, overdubbing, level conversion, etc. of the digital audio signal reproduced by the rotating magnetic node A (A1-A4) for advance reproduction, Magnetic head A (At-A4)
is ahead of the recording rotating magnetic nozzle R (Rs~R4) by a predetermined angle (300° in this example), and is relative to the recording rotating magnetic nozzle R (R*~R4) as shown in FIG. It is made to have a predetermined height h.

Furthermore, the rotary magnetic head A (At-A4) for advance reproduction reads the audio track portion TA of the inclined track T of the magnetic tape TP.
While scanning, press the throat C (
To prevent the magnetic head A (At-A4) from scanning the magnetic tape TP, the magnetic head C (CL-C4) does not scan the magnetic tape TP.
) in the range of θ to 120° (=360°-240') by an angle θ (60° in this example).

Each reproduction signal from the rotating magnetic head A for preliminary reproduction and the rotating magnetic head C for confirmation reproduction is transmitted to a semiconductor integrated circuit (IC) (1) provided in the rotating drum RD, as shown in FIG. After being amplified by the amplifiers (21, (31), the signals are supplied to the switching switches (41, (51), respectively, which constitute the switching circuit, and are then amplified by the control circuit (6).
-) □ is switched on so that either one of the switches (41, (51) is turned on, and the output of either one of the switches (41, (51)
It is supplied to the next coil (7a).

Thus, the four channels of the rotary transformer are shared by the confirmation reproduction rotary magnetic heads 01 to C4 and the advance reproduction rotary magnetic heads A1 to A4 via respective switching circuits. Incidentally, four channels of rotary transformers are used for the recording rotary magnetic nodes R1 to R4. Thus, in this rotary magnetic head device, it is sufficient to use an 8-channel rotary transformer.

As shown in FIG. 4, the control signal for the control circuit (6) in FIG. 3 is transmitted to a light emitting element Ql provided in a fixed part and driven by the control signal, and a rotating disk (8) that rotates together with the rotating drum. The signal is transmitted by a photocoupler consisting of a pair of light receiving elements (9a) and (9b) arranged above at an angle of 180°. Magnetic head CLIC2 and AL, A
The common control circuit of both switching circuits for 2 includes a light receiving element (
A control signal from 9a) is supplied to the magnetic heads C3',
C4 and A3. A control signal from the light receiving element (9b) is supplied to a common control circuit of both switching circuits for A4.

In FIG. 3, the changeover switch (4) is turned on when the rotary magnetic head C for confirmation reproduction is in operation, and the changeover switch (4) is turned on when the rotary magnetic head A for advance reproduction scans the audio track portion TA of the inclined track T. So that the switch (5) is turned on,
Next, an external control signal is supplied to the control circuit (6) via the photocoupler.

Note that the number of each of the rotating magnetic heads R, C, and A is not limited to four, but other numbers are also possible, and the number of channels of the rotating transformer is determined according to the number.

〔Effect of the invention〕

According to the present invention described above, there is provided a rotary magnetic recording head for recording digital video signals and digital audio signals on a pI4I4 track tape consisting of a video track section and an audio track section at the end thereof, and a magnetic tape. In a rotating magnetic head device of a confirmation audio recording device that confirms and reproduces a signal recorded while forming an inclined track on a magnetic tape, it is possible to reproduce signals recorded on an inclined track on a magnetic tape without increasing the number of channels of a rotating transformer. After playing back the digital signal recorded in the audio track section for signal processing,
What can be recorded on the original tilted track can be obtained. Thus, there is no need to increase the size of the rotating transformer, thereby eliminating any possibility that the rotating drum would be difficult to balance, that the rotating drum would be easy to WRilJ, or that the rotating transformer would be expensive.

[Brief explanation of drawings]

FIG. 1 is a layout diagram showing the arrangement of the main parts of the rotating magnetic head in an embodiment of the present invention, and FIG. 2 is a layout diagram showing the height relationship of the rotating magnetic head. FIG. 3 is a circuit diagram showing another main part of an embodiment of the present invention, FIG. 4 is a perspective view showing a part of an embodiment of the present invention, and FIG. 5 is a pattern showing a track pattern of a magnetic tape. It is a diagram. RD is a rotating drum, R (, Rt-R4) is a rotating magnetic head for recording, C (C1-C4) is a rotating magnetic head for confirmation reproduction, A (At-A4) is a rotating magnetic head for advance reproduction, (
41, +51 are changeover switches that constitute a changeover circuit, (7
) is a rotating transformer, TP is a magnetic tape, T is a tilted track, Tv is a video track section, and T^ is an audio track section. Figure 1 Figure 2 Figure 4 Figure 5 Procedural amendments Commissioner of the Japan Patent Office Manabu Shiga 1, Indication of the case 1981 Patent Application No. 260397 3゜ Person making the amendment Person involved in the case Patent applicant residence Location: Tokyo Parts and Illustrated Products, 6-7-35 Name (2
1'riSony Corporation Representative Director Norio Oga 4, Agent address: 1-8-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo 03-
343-582111 (Shinsho Building) 6, Number of Inventions Increased by Amendment (1) The claims in the specification are amended as shown in the appendix. (2) In the same document, the words ``at the end'' of page 4, lines 3 and 16, and page 10, line 15, are deleted. What is claimed above is a method for forming an inclined track consisting of a video track section and an audio track section on a magnetic tape (a recording rotary magnetic head for recording a digital video signal and a digital audio signal, and the above-mentioned inclined track on the magnetic tape). In a rotary magnetic head device of a digital video/audio recording device, the rotary magnetic head for confirming and reproducing confirms and reproduces a signal recorded so as to form a signal at the time of recording. A rotating magnetic head for advance reproduction that reproduces a digital audio signal recorded on an audio track portion in an inclined track on a magnetic tape, and each reproduction signal of the rotary magnetic head for confirmation reproduction and the rotary magnetic head for advance reproduction. 1. A rotary magnetic head device for a digital video/audio recording device, comprising a switching circuit for switching and supplying power to a rotary transformer.

Claims (1)

[Claims] a recording rotary magnetic head for recording digital video signals and digital audio signals such that an inclined track consisting of a video track section and an audio track section at the end thereof is formed on a magnetic tape; In a rotating magnetic head device of a digital video/audio recording device, which has a rotating magnetic head for confirming and reproducing a signal recorded on the magnetic tape during recording, A rotating magnetic head for advance reproduction that reproduces the digital audio signal recorded on the audio track section in the inclined track, a rotary transformer that switches each reproduction signal of the rotary magnetic head for confirmation reproduction and the rotary magnetic head for advance reproduction. 1. A rotary magnetic head device for a digital video/audio recording device, characterized in that it has a switching circuit for supplying a signal to the magnetic head.