JPS63160074A - Data recorder - Google Patents

Abstract

PURPOSE:To decrease the time required for consumption and recording of a recording medium by providing a data ineffective flag area at every frame of a DAT and setting the ineffective flag when a recording area is intermitted so as to apply recording. CONSTITUTION:One frame is constituted by two tracks of the DAT recorded by a rotary head and the data ineffective flag area is provided at every frame. In the DAT device, for example, in backing up the data from a hard disk device 6, a write address and a read address of a memory control circuit 23 are compared, a buffer memory 24 is idle and when the addresses are coincident, the signal is fed to a microcomputer 22. The signal is fed to a digital signal processing circuit 14, the data ineffective flag 1 is set and an ineffective data is recorded in the data part. Thus, in the device, even if the data is intermitted, since the recording is consecutive, smooth recording is attained at all times.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data recorder that records data for a computer or the like using a rotary head type digital audio tape recorder (DAT).

[Summary of the invention]

The present invention relates to a data recorder, which utilizes a so-called DAT recording device, provides a data invalid flag area in the signal, and records with this flag set when there is no external data, thereby ensuring good recording at all times. It is something to do.

[Conventional technology]

For example, in some combination systems, in order to protect the data written on the hard disk etc., this data is transferred to a so-called data streamer (recorder) once a day and recorded (backed up) on another recording medium. things are being done.

In this case, so-called analog audio tape recorders have conventionally been often used as the above-mentioned data streamers. However, in this analog tape recorder, the amount of recording media consumed is extremely large, and since the data rate during recording is low, it takes an extremely long time to transfer and record. Furthermore, there are other problems, such as the inability to easily locate the beginning of a desired recorded portion.

By the way, a so-called DAT (digital audio tape recorder) has been developed (rE S Rev
iewJ Sony Corporation Shibaura Factory Issue: l5SN 03
89-7737: December 19B5 issue, pages 11-17, etc.).

Since this DAT is originally designed to record and reproduce digital signals, it is suitable for recording the above-mentioned data. However, like this AT
In this case, since a rotating head is used, it takes a relatively long time for recording/reproduction to start up, and for this reason, for example, if the recorded data is interrupted, once recording is stopped,
When data arrives again, there is a possibility that recording cannot be performed smoothly due to a delay in the rise.

[Problem that the invention seeks to solve]

As described above, the conventional technology has problems such as the use of an analog recording data streamer, which increases the amount of recording media consumed and takes a long time to record.

[Means for solving problems]

The present invention has a rotating head, and one rotation of the gutter forms two inclined tracks, and these two inclined tracks are regarded as one frame, and a digital signal is completed within this one frame. A device (DAT (11)) which is encoded and recorded and reproduced is provided, and a flag area (subcode) indicating invalidity of data is provided in at least a part of the signal constituting the above-mentioned l frame. This data recorder is configured to set the flag and perform recording when there is no data to be recorded.

[Effect]

According to this, an invalid flag area for data is provided for each frame of DAT, and when recording data is interrupted, this invalid flag is set and recorded, so that when data arrives again, it is immediately recorded. Therefore, this DAT can be smoothly used as a data streamer, and thereby a good data recorder that consumes less recording media and requires less time for recording can be obtained.

〔Example〕

In FIG. 1, "ζ" (1) indicates the configuration of a DAT, in which a rotating head drum (11) is provided, and a magnetic tape (12) is placed around the drum (11). It is being transported wrapped around a 90 degree range.

Two heads A and B are provided on this drum (11), and two inclined tracks are recorded and reproduced by one rotation of this drum (11).

On the other hand, external digital data is input to 10 circuits (13), and from these 10 circuits (13), it is supplied to a digital signal processing circuit (14) where it is converted into the above-mentioned DAT format. This formatted signal is sent to the recording amplifier (15) and the recording/playback switch (16).
) is supplied to the heads A and B through the recording side contacts, and is recorded on the tape (12).

Also, the signal recorded on the tape (12) is head A.

When reproduced at B, this reproduction signal is supplied to the processing circuit (14) through the reproduction side contact of the recording/reproduction switch (16) and the reproduction amplifier (17), and the digital data extracted by inverse conversion is sent to the 10 circuits. (13) is output to the outside.

Furthermore, a control signal from the outside is supplied to the system control circuit (18), and this control circuit (
The signals from the control circuit (18) control the rotation of the head drum (11), the transfer of the tape (12), the switching of the switch (16), etc. During recording, the signals from the control circuit (18) 14) to form a subcode signal, which will be described later. Further, during reproduction, the signal extracted by the processing circuit (14) is supplied to the control circuit (18), where tracking and other controls are performed, and part of this signal is taken out to the outside.

D A T l) is formed by the above configuration. In this device, the DA is connected to the outside of the 10 circuits (13).
- By providing an AD conversion circuit and providing a predetermined control device outside the control circuit (18), it is possible to record and reproduce audio (analog) signals, for example.

On the other hand, in the above-mentioned device, an arbitrary interface bus (3) is connected to the outside of the DATfl) via the controller (2). Here, as the interface bus (3), (+lJ is the SC3I standard (r
NIKKEI ELECTI? 0MIC5J Published by Nihon Keizai Shimbun: October 6, 1986 Issue No. 102-107
(see page) can be used. Furthermore, this bus (3
) to the host computer (5) via the adapter (4)
and a hard disk device (6) etc. are connected.

In the above controller (2), the bus (3)
A protocol control circuit (21) is provided between the controller (21) and a microcomputer (22) and a memory control (DMA) circuit (23) that control the operation of the controller (2) via the control circuit (21). Data and control signals are exchanged with the bus (3). Further, state detection and operation control are performed between the microcomputer (22) and the DMA circuit (23), and the buffer memory (24) is performed through the DMA circuit (23).
) and the bus (3). Data is input/output between this memory (24) and the processing circuit (14) of DATfl via 10 circuits (25) (13). Further, control signals are exchanged between the microcomputer (22) and the system control circuit (18).

Therefore, in this device, data written to the hard disk device (6) is transferred to the controller (2) via the bus (3) in response to a transfer request from the controller (2) during recording.
2) and sent to the memory via the DMA circuit (23).
(24) is written. Furthermore, the data written in this memory (24) is read out via 10 circuits (25).
It is input to A T +11. And this D A T
In (1), the data input to the 10th circuit (13) is regarded as the same as the data from the AD conversion circuit during audio recording, and the digital signal processing circuit (I4) converts the data into a predetermined DA.
The data is converted into the T format and recorded on the tape (12) by heads A and B.

Also, during playback, head A starts from tape (12).

The signal reproduced at B is sent to the digital signal processing circuit (14)
The data is inversely transformed at , and data corresponding to the audio signal is extracted. Furthermore, this data is input to the controller (2) via the 10 circuit (13). In this controller (2), the memory (
The data written to the hard disk drive (24) is successively outputted via the DMA circuit (23) and sent to the hard disk device (24) via the bus (3).
6).

Furthermore, in this device, the format of the DAT recorded on the tape (12) is as follows.

In Fig. 2, one frame is composed of two tracks Ta and Tb recorded by heads A and B, and each of these tracks is formed from the bottom of the figure, and the recorded signal has a total length of 5. From the bottom side against 90 degrees.
Margin part of 051 degrees - P of subcode of 0,918 degrees
Preamble part for LL - 1st subchord part of 3,673 degrees - Postamble part of 0,459 degrees - 1,378 degrees
Gear part between blocks of 2.296 degrees - Tracking (ATF) signal part of 1,378 degrees - Gap part between blocks of 0,918 degrees - PLL preamble part of data of 0,918 degrees → Data of 58.776 degrees section → 1, 378 degree inter-block gap section → 2.296 degree ATF signal section -1
, 378 degree inter-block gap → 0.918 degree subcode PLL preamble part → 3.673 degree second subcode part -〇. The postamble portion is 459 degrees minus the margin portion is 5,051 degrees. Note that the scale of the figure is not accurate. In the above-mentioned apparatus, the data inputted from the 10 circuits (13) is added with a predetermined error detection/correction code, etc. in the processing circuit (14), and is stored in the data portions of tracks Ta and Tb in a predetermined interleaving relationship. They are sorted and inserted.

Further, in the above-mentioned apparatus, data of 2048 bits/7 bits can be recorded in each of the first subcode section and the second subcode section. In the audio signal recording format, the 2048 bits are divided into packs of 64 bits each, and information such as the time code and recording date and time of the signal recorded in each bank is recorded.

Therefore, it is possible to allocate a data recorder in this pack and use this bank to perform various controls.

That is, FIG. 3 shows the configuration of the P/7 for this purpose. In the figure, 64 bits are divided into 8 words of 8 bits each. The 4 bits on the MSB side of the first (first) word in this pack are used as the ITEM area, and this area is common to the audio signal recording format, and the contents of the bank are displayed in this 4-bit binary code. Ru. Note that 9 out of 16 codes for 4-focus have already been determined for recording audio signals, etc., and any one of the remaining 7 is determined for use in a data recorder.

Furthermore, the 3 bits on the LSB side of the first word and the next second word are used as the save set number (5SNO) area.
The total of 11 bits provides a binary value indicating, for example, the number of backups from the leading edge of the tape.

The third word is a file number (FN◯) area, and a binary value indicating the serial number of the file within the data backed up at one time (save set) is provided.

Furthermore, the 4 bits on the LSB side of the 4th word and the 5th and 6th words are used as the absolute frame number (AFNO) area, and a binary value indicating the serial number of valid frames from the leading edge of the tape is set in these 20 bits. It will be done.

The seventh word is used as a status display area.

In this word, the first bit on the MSB side is a flag area indicating that the frame is the end position (readout) of the bank amplifier, and the second bit is a flag area indicating that the data of the frame is invalid. The third bit is used as a flag area indicating that the frame is a frame of the ampoule period at the beginning and end of recording, and the fourth bit is used as a flag area indicating that the frame is a file mark. Furthermore, the 4 bits on the LSB side are provided with a numerical value representing the amount of data in one frame, for example, the number of blocks recorded in one frame with the unit data amount of input/output to and from the outside as a block, expressed in binary. The fifth bit from the MSB side of the first word is set to "0", the four bits from the MSB side of the fourth word are set to all "0" for the time being as extension bits, and the eighth word is set to "0" from the first to third bits. It is considered as parity for 7 words.

Therefore, in the above-mentioned device, for example, when data from the hard disk device (6) is being banked up, the
The write address and read address of the MA circuit (23) are compared, and the buffer memory (24) is
When the address is empty and the addresses match, that signal is supplied to the microcomputer (22). This signal is then supplied to the digital signal processing circuit (14) through the system control circuit (18), and a data invalid flag 1° is set at the second focus of the seventh word of the data recorder pack in the subcode section mentioned above. At the same time, arbitrary invalid data is inserted into the data section and recorded.

Therefore, in this device, since recording continues even if data is interrupted, there is no problem such as a delay in the start of recording when restarting due to stopping recording, and smooth recording can always be performed.

Thus, according to the above-described device, the DAT can be used as a data streamer, and in this case, according to the above-described configuration, the rotary head drum (11) is rotated at, for example, 200 rpm, so that data can be recorded at a speed of 192.00 rpm.
This is performed at an extremely high speed of 0 bytes, and the amount of recording media consumed can be extremely reduced. Furthermore, in this case, according to the above-mentioned configuration, data from the outside can be recorded smoothly even if there is an interruption, so that data can be recorded and reproduced in a satisfactory manner.

In addition, according to the above-mentioned structure, since the recording density is extremely high, no problem occurs even if the above-mentioned invalid data is recorded. However, in that case, if the invalid period continues for one second or more, the DAT may be stopped.

Also, during the invalid period, the absolute frame number (A
By not increasing FNO), it is possible to eliminate the influence on data search operations and the like.

〔Effect of the invention〕

According to this invention, an invalid data flag area is provided for each frame of DAT, and when recorded data is interrupted, this invalid flag is set and recorded, so that even when data arrives again, it is immediately stopped. Since the DAT can be recorded, it has become possible to smoothly use the DAT as a data streamer, and as a result, it has become possible to obtain a good data recorder that consumes less recording media and requires less time for recording.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of an example of the present invention, Figure 2, '! FIG. 33 is a diagram for explaining the same. (11 is DAT, [2+ is controller, (3) is bus, (4) is adapter, (5) is host computer, (
6) is a hard disk device.

Claims (1)

[Claims] It has a rotating head, and one rotation of the rotating head produces two
At the same time as the slanted tracks of the book are formed, a device is provided which uses these two slanted tracks as one frame and encodes and records/reproduces a digital signal so that it is completed within this one frame. A data recorder in which a flag area indicating invalidity of data is provided in a part of the signal constituting one frame, and when there is no data to be recorded, the flag is set and recording is performed.