JPS63251971A - Data recorder - Google Patents

Abstract

PURPOSE:To smoothly execute rerecording of data, by causing meaningless data of the quantity of one to several frames to be recorded whenever digital signals of the quantity of prescribed frames are recorded at the time of recording and even the frames of the meaningless data to be recorded at the time of rerecording. CONSTITUTION:A device (DAT 1) is manufactured in such a way that the device is equipped with a rotary head drum 11 and two inclined tracks are formed and, at the same time, digital signals are recorded and reproduced after encoding so that the recording of the signals can be completed in one frame, with the one frame being set to the two inclined tracks, when two heads A and B on the drum 11 respectively make one turns. A microcomputer 22 controls the recording of the digital signals so that meaningless data of the quantity of one to several frames can be recorded whenever the digital signals are recorded by the quantity of prescribed frames. Therefore, necessary data are not destructed and rerecording can be executed smoothly at the time of rerecording, since even the frames of the meaningless data are recorded at the time of rerecording.

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, and records one to several frames of random data every time a predetermined frame of a digital signal is recorded during recording. This allows for smooth editing and re-recording of digital signals.

[Conventional technology]

For example, in a computer, in order to save data written on a hard disk or the like, the data is transferred to a so-called data recorder and recorded.

In this case, as the above-mentioned data recorder, so-called analog audio tape recorders have conventionally been widely used. However, in such an analog tape recorder, the amount of recording media consumed is extremely large, and the data rate during recording is low, so it takes a lot of time to transfer and record. There are problems such as the inability to easily perform cueing.

By the way, DAT (digital audio tape recorder) has been developed (r HS ReviewJ
Issued by Sony Corporation Shibaura Factory: l5SN 0389-
773'7: December 1985 issue, pages 11 to 17, etc.) According to this DAT, it was originally designed to record and play back digital signals, so it is possible to record and play back digital signals. Suitable for recording.

However, in the case of such an AT, the width of the recording head is usually made larger than the track pitch, and guard panless overlapping recording is performed by alternately erasing part of the previous track. For this reason, for example, when a part of recorded data is to be reproduced, edited, and re-recorded, it is difficult to re-record this data, even though reproduction and editing can be performed easily.

In other words, when overlapping recording as described above is performed,
If the edited data is re-recorded, because the recording head is wide, the next track that was previously recorded will be erased, and the data that should be saved will be destroyed.

In response to this, the applicant of the present application has previously developed a device that enables good recording by providing an ampoule signal period at the beginning and end of one recording when recording data using DAT. However, in the case of this device, all of the data recorded at one time must be re-recorded, and if the amount of data is large, re-recording and re-recording will be required. It was taking an extremely large amount of time.

[Problem that the invention seeks to solve]

As described above, in the conventional technology, when a DAT is used as a data recorder, recorded data cannot be easily re-recorded.

[Means for solving problems]

The present invention has a rotating head, and two inclined tracks are formed by one rotation of the rotating head, and these two inclined tracks are regarded as one frame, so that a digital signal is completed within this one frame. A device (DAT (1)) is provided which records and reproduces the digital signal encoded in the digital signal, and at the time of recording, one to several frames of unexpected data are recorded every time a predetermined frame of the digital signal is recorded. This is a data recorder characterized by the following (microcomputer (22)).

[Effect]

According to this, one to several frames of unexpected data are recorded every time a predetermined frame of the digital signal is recorded during recording, so it is possible to record even this unexpected data frame when re-recording. This enables smooth re-recording without destroying necessary data, and thereby enables a good data recorder to be formed using this DAT.

〔Example〕

In FIG. 1, (1) shows the configuration of DAT, and this
The A T (1) is provided with a rotating head drum (11), and the magnetic tape (12) is wound around the drum (11) within a range of about 90 degrees and is transported.

On this drum (11), 82 recording and reproducing heads A are provided at angular intervals of 180 degrees, and two inclined tracks are recorded and reproduced by one rotation of this drum (11). It has become so.

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 formant signal is sent to the recording amplifier (15) and the recording/playback switch (16).
It is supplied to the heads A and B through the recording side contacts of the tape (12), and is recorded on the tape (12). Also, when the signal recorded on the tape (12) is played back by heads A and B, this playback signal is sent to the processing circuit (14) through the playback contact of the recording/playback switch (16) and the playback amplifier (17). The supplied digital data is inversely converted and taken out through 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 predetermined subcode signal. Further, during reproduction, the signal extracted by the processing circuit (14) is supplied to the control circuit (19), where tracking and other controls are performed, and part of this signal is taken out to the outside.

DAT+1) is formed by the above configuration.

In this device, D is connected to the outside of the 10 circuits (13).
A - An AD conversion circuit is provided and a control circuit (18)
By providing a predetermined control device externally, 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 DAT (1) via the controller (2). Here, as the interface bus (3), for example, the SC3I standard (rNIKKE)
IHLECTRONICSJ Published by Nihon Keizai Shimbun: 1
(see October 6, 1986 issue, pages 102 to 107) can be used. Furthermore, an adapter (
4), a host computer (5), a hard disk device (6), etc. are connected thereto.

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 input/output is performed between this memory (24) and the DAT (11 processing circuits) via 10 circuits (25) and (13). Control signals are exchanged with the circuit (18).

In this device, data written in the hard disk device (6) is input to the controller (2) via the bus (3) in response to a transfer request from the controller (2) during recording, and is sent to the DMA circuit (23). through memory (24)
written to. Furthermore, the data written in this memory (24) is read out via 10 circuits (25) and
T Tl). And this D A T (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 is converted into a predetermined DAT format by the digital signal processing circuit (14) and sent to the head A. .

It is recorded on the tape (12) at B.

By the way, during this recording, data is supplied from the memory (24) to the digital signal processing circuit (14), for example, from the host computer (5) to 2n (for example, 512
) A data signal transmitted in bit units is transferred to one track by two inclined tracks formed by one rotation of the drum (11).
This is done so that bits that are an integer multiple of the above-mentioned 2n are supplied during this one frame (Japanese patent application No. 6).
1-303080).

Therefore, during this recording, for example, reading of the memory (24) is controlled so that one to several frames of unexpected data are recorded every time a predetermined frame is recorded.

In other words, Figure 2 shows the entirety of one recording, in which multiple frames of ampoule signals are recorded from the beginning (left) side of the tape.
Subsequently, n frames of data signals are recorded. After recording these n frames, for example, one frame of an unexpected dummy data signal is recorded. Furthermore, the above-mentioned n frames of data signals and one frame of dummy data signals are repeatedly recorded, and finally, the remaining m frames of data signals recorded every n frame are recorded, and then a plurality of frames of ampoule signals are recorded.

Furthermore, FIG. 3A shows in detail the frames in which the dummy data signal is recorded, and shows the rotating head drum (11
) One frame of dummy data signals recorded by heads A and B (shown with hunting) is followed by an n-frame data signal period, and one frame of dummy data signals is further provided. . During reproduction, a desired dummy frame interval is extracted using a timing signal such as a frame number in the data signal.

On the other hand, when re-recording this data signal after editing or other processing, the rotational phase servo of the drum (11) etc. is removed from the part before being re-recorded. As shown in FIG. 2, the recording of the dummy data signal by head B in the latter half of the dummy frame starts, and after recording the data signal of n frames, only the recording of the dummy data signal by head A is performed, and the re-recording is completed.

As a result, recording is performed as shown in FIG. At the end of the re-recording, a part of the track previously recorded by head B is erased due to the width of head A, but an unexpected dummy data signal was originally recorded on this track. It doesn't cause any problems because it's just there.

Therefore, in this device, data signals between dummy frames can be arbitrarily re-recorded, and recorded data signals can be easily edited, rewritten, etc.

In the above-mentioned apparatus, the n frames in which the data signals between the dummy frames are recorded may be defined based on the number of recorded tracks; ), when recording is repeatedly performed when a recording error occurs, the actual number of recorded frames may be set to n.

Furthermore, it is sufficient to record the dummy data signal with at least n frames, but if the above-mentioned repeated recording is performed and there is a risk that errors will increase during re-recording, multiple frames should be recorded in consideration of the increase. It may be provided.

Furthermore, in this case, the maximum number of tracks required to record n frames may be determined from the error rate assumed in the recording medium, etc., and the number of tracks between dummy frames may be determined based on this. By keeping the recording position of the frame constant on the recording medium and making the frame period in which the ampoule signal is recorded long enough to be detected by high-speed search, it is possible to extract the desired recorded part at a distance after this detection. Can be done.

Thus, according to the above-mentioned device, the DAT can be used as a data recorder, and in this case, according to the above-mentioned configuration, the rotary head drum (11) is rotated at, for example, 20QOrpm+, and data recording is extremely fast at 192,000 bytes per second. This can be done at high speed, and the amount of recording media consumed can be extremely small. Furthermore, in this case, the above-described configuration allows for clean re-recording, so that good data can be recorded using this.

〔Effect of the invention〕

According to this invention, one to several frames of unexpected data are recorded every time a predetermined frame of the digital signal is recorded during recording, so even the frames of this unexpected data are recorded when re-recording. This allows for smooth re-recording without destroying the necessary data.
This has made it possible to form a good data recorder using this DAT.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an example of the present invention, and FIGS. 2 and 3 are diagrams for explaining the same. (1) is DAT, (2) is controller, (3) is bus, (4) is adapter, (5) is host computer, (
6) is a hard disk device, (11) is a rotating head drum, (12) is a tape, (14) is a digital signal processing circuit, (16) is a switch, (18) is a system control circuit, (22) is a microcomputer, (23)
is DMA, (24) is a memory, and A and B are recording/reproducing heads.

Claims (1)

[Claims] It has a rotating head, and one rotation of the rotating head produces two
At the same time as the inclined tracks of the book are formed, a device is provided which records and reproduces the two inclined tracks as one frame and encodes the digital signal so that it is completed within this one frame. A data recorder characterized in that one to several frames of random data are recorded every time the digital signal is recorded for a predetermined frame.