JPS58166506A - Magnetic recording device - Google Patents

Abstract

PURPOSE:To reduce the influence of a dropout through error detection and correcting interpolation by an error correcting code constitution block even when such a dropout that a data signal recorded on one track is erased entirely is generated. CONSTITUTION:A rotating drum 1 rotates as shown by an arrow (a) and to this rotating drum, heads A and B constituting a rotary head are provided at an angle alpha( 180), namely, facing each other. A magnetic tape 2 is wound around the peripheral surface of the drum 1 at an winding angle beta( 220) which is about 30 deg. greater than a conventional winding angle from a point (c) to a point (e) so that one terminal of a slanting track formed by a helical scan is extended to record a video and a data signal on time-division basis. The tape is guided by guide pins 3 and 4 to run as shown by an arrow (b). The heads A and B while rotating by 30 deg. from the point (c) to a point (d) record or reproduce a processed signal such as a sound signal. Further, they record or reproduce a processed video signal while rotating by about 180 deg. from the point (d) to the point (e).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to adjusting the winding angle of a magnetic tape around a rotating drum so that video signals and data signals can be recorded in a time-sharing manner by extending one end of a diagonal track formed by helical scanning. Regarding the magnetic recording sickle training device that increases
In R, data signals are recorded on tracks formed on a magnetic tape as follows.

The digitally converted data signal for each predetermined section to be recorded on one track, for example, the data signal corresponding to one field of the Eirin signal, is first stored in a random access memory (hereinafter referred to as RAM) as shown in FIG. ■
It is written in intervals. Thereafter, the data is read out from the memory M, encoded in the interval shown in FIG. The signal is written to the RAM while being encoded into one correction code constituent pull. Then, the data signal formed into one correction code constituent block is read out from the RAM after time-base compression, and is recorded in the 111) rack in two sections indicated by the first prisoner.

However, if the data signal of a predetermined section to be recorded on one track is made into one single-power correction code configuration block p and recorded on one track as it is, then,
When a large dropout or the like occurs on the trunk, it is very likely that the detection and correction interpolation capabilities of the correction code construction block will be exceeded. To take an extreme example, if all the data values recorded on one track are lost due to a dropout, etc.
Correct interpolation is not possible at all in the portion corresponding to the data signal, and effective correction cannot be performed.

The present invention has been made in view of these points, and even if a dropout or the like occurs in which all data signals recorded on one track are lost, the error correction code configuration blocks can be used. 114n detection and correction interpolation reduces the effects of dropout, etc. The purpose of the present invention is to provide a magnetic recording device that can perform the following steps.

Next, as an embodiment of the magnetic recording device of the present invention, a scan type VTR will be described with reference to the drawings.

Fig. 2 is a schematic diagram of the rotating drum section, Fig. 6 is an overall block circuit diagram, Figs. This is a diagram illustrating the recording mode of data signals of the rotary drum (13 is an arrow, which rotates in the egg weight direction, and the (b) rotary drum (the first one is the A1B head that constitutes the rotary head). are arranged at an angle of α-?180 degrees and are arranged opposite to each other.Magnetic tape (2)
In order to extend one end of the diagonal track formed by helical scanning and record video signals and data signals in a time-sharing manner, conventional windings are installed on the circumferential surface of the drum (1) from point 0 to e and at. The attachment is 220 in β, which has been increased by approximately 3'0 degrees.
Degree winding is angle winding, guide pin +31 (4
7 and run in the direction of the arrow. The A and B heads alternately record or play back processed data signals, such as audio signals, while rotating through an angle of about 30 degrees from point 0 to point d, and then rotate about 180 degrees from point d to point 0. The processed video signal is alternately recorded or played back while rotating the angle of the camera.

(i) First, the time of recording will be explained.

For example, an analog data signal such as an audio signal is digitally converted by an AD converter (5), and then converted to a digital signal by a TEL processing unit (6).
1 is given. The data processing unit (6) includes six RAMIs, each of which can store a predetermined section of a data signal corresponding to one field of a video signal.

III (7) (81 (9) and ORO (cycle i
It has an encoder (decoder) unit aυ for coding for detecting and correcting errors using a redundancy check (redundancy check) method, and controls them. A
The data signal from the D conversion unit (51 is V!, 1 of the image signal
(1) Three RAMs for each predetermined section to be recorded on one track;
I, I, 1ll(7)+81(9) are written in order.

Let us now assume that a data signal of a predetermined interval corresponding to one field containing a video signal is written to RAMI (m4) in the ■ interval (1/60 scale) shown in Figure A.According to this, RAMI When the writing of the data signal to (7) is completed, the data signal of a predetermined interval corresponding to the next one field is written to the RAM 118) in the [stock] interval shown in FIG. 4C. Also, this RAM
At the same time as writing to RAMI (8), the data signal of a predetermined section written to RAMI (F) is read out with the relative axis being pressed and given to the ORO encoder section aυ.
The RO encoder section aIJ encodes the successively output data signals in the interval shown in FIG.
The data signal of the error correction code configuration block (hereinafter referred to as the correction configuration block signal) is the same as the data signal of the error correction code configuration block (hereinafter referred to as the correction configuration block signal).
7) will be written in the data signal recording area of the next track in the section ■ shown in Figure 4G. Correction of 411 The portion of the divided block signal and the RAM gate (half of which has already been recorded on the magnetic tape) remain in the area.
The remaining halves obtained by dividing one corrected configuration block number written in 9) are successively output. Then, the data processing unit (6
), a matching signal ID is attached to both the husband and husband, an END mark is added between them, and furthermore, N RZ (n
on -return to zero) and is applied to the switching circuit sections a', aa'a. On the other hand, the video signal l! 5I! - In the image processing unit 041, low frequency conversion, F
M-hen 1! After the signal has been read, it is applied to the switching circuit section a2αJ. The switching circuit section 1403 transfers the processed video signal and data signal to the magnetic tape (
2) Processed video signals and data signals are distributed so that they are time-divisionally recorded on diagonal tracks formed by helical scanning. Switching circuit section u21 Q3
The corrected component block signal, which is a half-processed data signal given to 1, is amplified through a predetermined contact point of the switching N-way unit u203, and then passed through a predetermined head to be amplified by the 1 in the section (6). They are recorded together in the data signal recording area of the track. Similarly, a film that has been disposed of*1
After No. 8 is also amplified through a predetermined contact point of the switching path section 112 + Q field, the data signal of a predetermined section corresponding to this leap and the next field is transferred to the video signal recording area of the track via a predetermined head. 8).

When the writing of this one field data signal to )tAMI18) is completed, the data signal of a predetermined interval corresponding to the next one field is further written to RAMIF (9) in the ■ interval shown in FIG. 4E.・Also, RAMM (8
) The /31r fixed interval reno data signal written in the /31r constant interval reno data signal is similarly encoded with the
is made into one correction configuration pull signal, and RAMI (
Then, in the section 2 shown in FIG.
The remaining one half of the corrected constituent block signal written in
is added, an END mark is added, and NRZ change 11
11 and one track of data is transferred and recorded together on the rear.

In this way, each of the five RAMs is capable of storing a predetermined section of a data signal corresponding to one field of a video signal.
By sequentially switching over I, L, L (7J (8) 19) and writing and starting, each divided half of the corrected constituent block signal is stored in the data signal recording area of one track as shown in Fig. 6. Recorded as shown. That is, one corrected constituent block signal is recorded in a distributed manner over two tracks. Note that the symbols I, I, and I indicate components divided from one corrected component block signal, and arrows s and f indicate the running direction of the magnetic tape and the recording direction of the track, respectively.

(N)% Next, the time of reproduction will be described.

Now, suppose that a corrected constituent block signal is reproduced from the data signal recording area of the track recorded as described above in section 2 shown in FIG.
This switching circuit section (NRZ demodulated through a predetermined contact point of 121aa and the data processing section (6), distributed based on the match signal ID and END mark for each correction configuration block, and stored in each RAM] (7) and RAM I (8
, 1 is written in half. According to this, the divided half of one corrected constituent block signal reproduced in section 51A shown in section 2 has already been written in RAMI (7). In other words, a correction configuration block signal corresponding to one feed of a video signal is written in the RAMI (73 includes all the signals divided from one correction configuration pull signal). .

Next, this written original nailing configuration block signal is read out from the RAMP (71) and given to the CRe decoder section aυ. In the ORO decoder section 6υ,
tIcS diagram Bζ is used to decode a code having a fixed code structure in the section 2 shown in FIG. This corrected interpolated data signal is transferred to the RAM again.
It is written to I(7) and then read out on the time axis expanded by the section 2 shown in FIG. 0. And D
The signal is converted into an analog signal by the A converter 05) and output as the original data signal.

While one correction configuration block number successively output from aAMI (71) is being decoded in the ORO decoder section 1υ, the data signal decoded and written to RAMIM (9) is shown in FIG. 5G. It is read out in the indicated section (■), converted by the DA converter a9, and output.
The corrected configuration pull signal reproduced from the data signal recording area of the next track in the section shown in FIG. ). At this point, it is regenerated into RAM g 181 and written in half to become the original one. [The normal constituent block signal is decoded in the section shown in Figure 5, RAM1 again
181. Then, the signal is successively outputted in the section (2) shown in FIG. 5E, converted by the DA converter α5), and output.

By repeating this process, 110,000 original analog data can be obtained without interruption.

Similarly, the video signal is also re-routed from the video signal recording area of the truck, and the video signal is sent back to the video processing section a for local radio, FM (M
It is converted into L key and output.

Note that the signal that is retransmitted from the magnetic tape (2) by combining the respective halves of the two correction component break signals is called 2.
As for the coincidence signal ID to be distributed to individual RAMs, there are two methods: assigning an address to each divided correction configuration pull signal and determining the address based on that address, or changing the marker pattern using a marker used to cue the signal. There are other methods.

In this embodiment, each of the two correction component block signals is divided into halves, each half is combined to record in the data signal recording area of one trunk, and the area is divided into the data signal recording areas of the tracks. I explained how to record by However, the division of the corrected constituent block signal is not limited to half, and may be divided into 115 and 2/6, for example.

In addition, instead of dividing the track into areas and recording each one, for example, each of the two 4" block numbers divided in half is divided into smaller pieces, and the data signal recording area is alternately divided into strips. Furthermore, based on this embodiment, in order to divide one corrected component block signal into n parts and record them in fractions on n trunks, each of (n+1) R capable of storing a predetermined section of a data signal corresponding to one field of a video signal;
Just prepare AM.

Next, another embodiment in which the correction configuration pull signal is recorded on the track will be described.

FIG. 7 is an overall circuit diagram of the printer, and the same reference numerals as in FIG. 6 indicate the same contents. 11E8rj4, FIG. 9 is a timing chart diagram, and FIG. 10 is a diagram showing the state of the correction configuration pull-pull signal to the track.

Note that explanations that overlap with those of the above embodiments will be omitted.

0), the time of recording will be described.0 The data processing section (6) in this embodiment is a RAM1. l, ill, IV 17
J't8F'[9r (controls these with a curvature. Now, suppose that the data signal of a predetermined section corresponding to one field of the video signal digitally converted in the AD converter (5) is the data RAM1 via the processing unit (6)
(Assume that 7f is written in the ■ section (1/60 reduction) shown in 8th hA. According to this,) CAM (
7, the data signal of a predetermined section corresponding to the next field is read out and the data signal written in FIG. It is encoded in the encoder section Gυ and becomes one corrected constituent block signal. And again RANI
(Written to 7γ. Furthermore, RAM Ml (9f
Simultaneously with the writing to RAMI (8γ), the data signal written to RAMI (8γ) is similarly output and encoded with the @ interval shown in Figure 8D and then written to RAMI 18f again.

These encoded and written RAM l.

The corrected constituent block signals of each M177'i8r are compressed on the time axis and output one after another in sections ① and ② shown in FIG. A matching value ID is added to each half or half of the data, an END mark is added, and the data is NRZ modulated and recorded. In addition, in the above, RAMI (7
R corresponding to a data signal in a predetermined interval one field before and one field before the data signal written in 1'.
AM1. The encoded corrected constituent block signals written and encoded are similarly recorded on the track in each of the sections 1 and 2 shown in Figure E.

Then, [10 is recorded on the track as shown in FIG. 1ζ. The similar numbers 1, I, and 111V indicate the signals divided from one correction component program signal.The arrows 1 and t indicate the running direction of the magnetic tape and the recording track, respectively. 0, which indicates the direction (formerly, we will discuss the time of playback 0) Now, let us assume that the data signal recording area of the track recorded as described above in each of the ■ and ■ sections shown in FIG. The Tsukubin number is reproduced, and each corrected constituent block is sorted and divided based on the matching signal ID and END mark.
A correction configuration block signal corresponding to one field of the video signal is written in each of M 1 and I 177'(8J'117rt8r.Next, %RAMI(
The original one correction configuration pull signal written in 77' is read out and given to the ORO decoder section aυ, where it is decoded in the O section shown in FIG. 9B, and is used for error detection and correction. Interpolation is done. And then RAM again
Similarly, the corrected configuration break signal written to RAMIt8r and returned to the original one is decoded in the section ■ shown in FIG. 9C, and the error tp detection and correction interpolation are performed. The data is then written to the RAMI (87') again.Then, the data is read out on the expanded time axis using the sections 1 and 2 shown in H, and outputted via the DA'R converter 051. In addition, in the above, RAM
The correction configuration break signal corresponding to the data signal in a predetermined section after one field and further one field after the data signal written in I(8r) is 0, 2 as shown in FIG. 9A.
Each section is generated from the data signal recording area of the track and written to each of the RAM fibers, N(9/Q(if').

In addition, based on this embodiment, in order to divide one correction constituent block signal into n parts and record them distributed over n tracks, each of the 2m1 parts corresponds to one field of the video signal. RAM capable of storing a predetermined section of data signal
All you have to do is prepare.

In the above two embodiments, a predetermined section of the data signal corresponding to one field of the video signal, a predetermined section of the data signal to be recorded on the RITBI track, is made into one correction configuration break signal, and this is It is divided in half and recorded on two tracks. However, there is also a case where the data signal is first divided, each of the divided blocks is used as a correction configuration pull signal, and 01 correction configuration blocks are divided into n, which may be distributed and recorded on two tracks. The same is true. In this case, it is possible to reduce the effects of dropouts etc. on the data signal.
When converting the signal to a normal constituent block signal, it may be performed based on a known method other than the ORO method. In summary, the magnetic recording device of the present invention is configured such that the data signal of the constant section to be recorded on one track is made into a correction code constituent block and distributed over a plurality of tracks. This is a characteristic feature.

As a result, even if a large dropout occurs on one track, the contents lost due to dropout etc. can be supplemented by error detection and correction interpolation based on the parts recorded on other tracks. It is possible to do so. Therefore, the influence of dropouts and the like can be reduced.

[Brief explanation of the drawing]

The first problem is a timing chart showing the processing of data signals up to the time of recording on a conventional track. Figure 2 shows an example of the magnetic recording device of the present invention. Schematic diagram and block diagram of the rotating drum section of a helical scan type VTR, Figure 94, Tortoise 5
The figure is a timing chart showing the processing of the data signal of the playback poem during recording by the block circuit of Fig. 3, and the recording of the data signal of the in-nailed code constituent block on the track by the block circuit of 43 m in the sixth section. Figure 7 is a boot circuit diagram showing another embodiment of the present invention.
Fig. 9 is a timing chart showing the processing of data signals during recording and playback by the block circuit in Fig. 7, and Fig. 10 is a correction code structure for errors on the track by the block circuit in Fig. 7. FIG. 4 is a diagram showing a recording mode of data signals on a block; In addition, in the drawing number ζ, (61...... Data processing section (7J18J (9+, 00.,, R
A M(7r18r(9fO and 0υ ・・・・・・・・・・・・・・・・・・ CRC
This is an encoder (decoder) section. Agent: Tōru Ueya, ・Yoshio Nibao I, Shunmitsu Sugitori

Claims (1)

[Claims] In a magnetic 1tMil network device, one end of a diagonal track formed by helical scanning is grown to increase the winding angle of the magnetic tape around a rotating drum so that video signals and data signals can be recorded in time division. The data signal for each predetermined section to be recorded on the track is
Either the data signal for each predetermined section is divided into a plurality of blocks after forming a p-correction code constituent block, or the data signal for each predetermined section is divided into a plurality of blocks, each of which is made into a *, t* correction code constituent block, and each divided data signal is divided into a plurality of tracks. A magnetic recording device characterized by being configured such that recording is performed in a distributed manner.