JP2576497B2 - Data recorder - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recorder for recording data from 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, in which a so-called DAT recording device is diverted, and one to several frames of unintended data are recorded every time a digital signal is recorded for a predetermined frame during recording. By doing so, it is possible to smoothly edit and re-record the recorded digital signal.

[Conventional technology]

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

In such a case, a so-called analog audio tape recorder has often been used as the above-mentioned data recorder. However, in such an analog tape recorder, the consumption of the recording medium becomes extremely large, and the data rate at the time of recording is low, so that much time is required for transfer and recording. Further, there is a problem that a desired recording portion cannot be easily located at the head.

By the way, DAT (Digital Audio Tape Recorder) has been developed ("ES Review" published by Shibaura Factory, Sony Corporation: ISSN 0389-7737: December 1985, Nos. 11-17)
Page). According to the DAT, since it is originally designed to record and reproduce digital signals, it is suitable for data recording as described above.

However, in the case of such a DAT, the width of the recording head is usually made larger than the track pitch, and a part of the previous track is alternately erased to perform guard handless overwriting. Therefore, for example, when a part of recorded data is reproduced, edited and re-recorded, it is difficult to re-record this data even if reproduction and editing can be performed easily.

In other words, when the overwriting is performed as described above, if the re-recording of the edited data is performed, the next track previously recorded is erased because the recording head is wide. , Data to be stored will be destroyed.

On the other hand, the applicant of the present application has previously provided an apparatus in which when performing data recording using DAT, an amble signal period is provided at the beginning and end of one recording so that recording can be performed well. A proposal was made (see Japanese Patent Application No. 61-314922). However, in the case of this apparatus, re-recording has to be performed for all data recorded at one time, and when this data amount is large, it takes much time for reproduction and re-recording.

[Problems to be solved by the invention]

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

[Means for solving the problem]

The present invention has a rotating head, and two rotation tracks are formed by one rotation of the rotation head, and the digital signal is completed within one frame by using the two tilt tracks as one frame. Data recorder (DAT)
(1)) A data recorder characterized in that at least one frame of insignificant data is recorded every time the digital signal is recorded for a predetermined frame during recording (microcomputer (22)). .

[Action]

According to this, since one or several frames of insignificant data are recorded each time a digital signal is recorded for a predetermined frame during recording, it is necessary to record up to this insignificant data frame during re-recording. Thus, re-recording can be performed smoothly without destroying necessary data, and a good data recorder can be formed using this DAT.

〔Example〕

In FIG. 1, (1) shows the structure of the DAT.
(1) is provided with a rotary head drum (11), and the magnetic tape (12) is wound around and transported by a range of about 90 degrees around the drum (11). And this drum (11)
Above, A and B recording / reproducing heads are provided at an angle interval of 180 degrees, and two inclined tracks are recorded / reproduced by one rotation of the drum (11). I have.

On the other hand, digital data from the outside is input to the IO circuit (13), and is supplied from the IO circuit (13) to the digital signal processing circuit (14), where the above-described conversion of the DAT into a warm is performed. The formatted signal is supplied to the heads A and B through the recording amplifier (15) and the recording / reproducing switch (16) on the recording side, and is recorded on the tape (12). The signals recorded on the tape (12) are
The reproduced signal is supplied to the processing circuit (14) through the reproduction side contact of the recording / reproduction changeover switch (16) and the reproduction amplifier (17), and the digital data obtained by inverse conversion is taken out by the IO circuit ( Output to outside through 13).

Further, an external control signal is supplied to a system control circuit (18), and the signal from the control circuit (18) controls the rotation of the head drum (11), the transfer control of the tape (12), and the switching of the switch (16). Controls are performed, and a recording control circuit (18)
Is supplied to the processing circuit (14) to form a predetermined subcode signal. At the time of reproduction, a signal extracted by the processing circuit (14) is supplied to a control circuit (19) to perform control such as tracking, and a part of the signal is taken out.

DAT (1) is formed by the above configuration. In this device, a DA / AD conversion circuit is provided outside the IO circuit (13), and a predetermined control device is provided outside the control circuit (18), so that, for example, recording / reproducing of an audio (analog) signal is performed. be able to.

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, for example, the SCSI standard (“NIKKEI ELECTRONICS”) is used as the interface bus (3).
(Nippon Keizai Shimbun, October 6, 1986, pages 102-107). Further, a host computer (5), a hard disk device (6) and the like are connected to the bus (3) via an adapter (4).

A protocol control circuit (21) is provided between the controller (2) and the bus (3), and the microcomputer (22) controls the operation of the controller (2) via the control circuit (21). ) And a memory control (DMA) circuit (23), and data and control signals are exchanged between the bus (3). Further, state detection and operation control are performed between the microcomputer (22) and the DMA circuit (23), and data is transferred between the buffer memory (24) and the bus (3) through the DMA circuit (23). Input and output are performed. An IO circuit (2) is connected between the memory (24) and the processing circuit (14) of the DAT (1).
5) Data input / output is performed via (13). Control signals are exchanged between the microcomputer (22) and the system control circuit (18).

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.
And written into the memory (24) via the DMA circuit (23). Further, the data written in the memory (24) is read out via the IO circuit (25) and input to the DAT (1). In the DAT (1), the data input to the IO circuit (13) is regarded as equivalent to the data from the AD conversion circuit at the time of audio recording, and the digital signal processing circuit (14) converts the data into a predetermined DAT format. The data is converted and recorded on the tape (12) by the heads A and B.

By the way, at the time of this recording, the data is supplied from the memory (24) to the digital signal processing circuit (14) by, for example, converting the data signal transmitted from the host computer (5) in units of 2 ⁿ (for example, 512) bits by the above-described method. One of the drums (11)
The two inclined tracks formed by rotation are regarded as one frame, and an integer multiple of ²ⁿ is supplied between the frames (see Japanese Patent Application No. 61-303080).

Therefore, at the time of this recording, for example, reading of the memory (24) is controlled such that one to several frames of unintended data are recorded each time recording of a predetermined frame is performed.

That is, FIG. 2 shows the entirety of one recording, in which an amble signal is recorded in a plurality of frames from the beginning (left) side of the tape, and then a data signal is recorded in n frames. Then, after the recording of the n frames, a meaningless dummy data signal is recorded, for example, for one frame. Further, the data signal of n frames and the dummy data signal of one frame described above are repeatedly recorded, and the remaining m recorded last n frames at a time are recorded.
A frame data signal is recorded, and then an amble signal is recorded in a plurality of frames.

FIG. 3A shows details between frames in which dummy data signals are recorded.
1) Following a dummy data signal of one frame (shown by hatching) recorded by the upper heads A and B, a data signal period of n frames is provided, and a dummy data signal of one frame is further provided. I have. At the time of reproduction, a desired dummy frame is extracted using a timing signal such as a frame number in the data signal.

On the other hand, when this data signal is re-recorded after processing such as editing is performed, the rotational phase servo and the like of the drum (11) are taken from the portion before re-recording. As shown in B, the recording starts with the recording of the dummy data signal by the head B in the latter half of the dummy frame, and after the recording of the data signal of n frames, only the recording of the dummy data signal by the head A is performed, and the re-recording is completed.

As a result, recording is performed as shown in FIG. Here, at the end of re-recording, a part of the track previously recorded by the head B is erased due to the width of the head A, but a dummy data signal which is originally insignificant is recorded on this track. There is no problem.

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

In the above-described apparatus, the number of tracks on which the data signal is recorded between the dummy frames may be defined based on the number of tracks to be recorded. For example, the applicant of the present invention has proposed (see Japanese Patent Application No. 62-4434). As described above, when recording is repeatedly performed when a recording error occurs, the actual number of recorded frames may be set to n.

It is sufficient to record at least one frame of the dummy data signal. However, if there is a possibility that an error may increase at the time of re-recording when the above-described repetitive recording is performed, a plurality of frames may be considered in consideration of the increase. It may be provided.

Further, in this case, the maximum number of tracks necessary for recording substantially n frames may be obtained from an error occurrence rate or the like assumed in the recording medium, and the number of tracks between dummy frames may be determined therefrom. According to this, the recording position of the dummy frame becomes constant on the recording medium. For example, by setting the frame period in which the amble signal is recorded to a length that can be detected by a high-speed search or the like, desired recording can be performed at a distance after the detection. You can take out parts.

Thus, according to the above-described device, the DAT can be used as a data recorder. In this case, according to the above-described configuration, the rotary head drum (11) is rotated at, for example, 2000 rpm,
Data recording is performed at a very high speed of 192,000 bytes per second, and the recording medium consumed thereby can be extremely reduced. Further, in this case, according to the above-described configuration, smooth re-recording can be performed, and therefore, good data can be recorded using the re-recording.

〔The invention's effect〕

According to the present invention, one to several frames of insignificant data are recorded each time a digital signal is recorded for a predetermined frame at the time of recording. As a result, re-recording can be performed smoothly without destroying necessary data, thereby making it possible to form a good data recorder using this DAT.

[Brief description of the drawings]

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

Continuation of the front page (72) Inventor Hiroshi Ishibashi 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Katsuzumi Inazawa 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Sonny (56) References JP-A-63-161582 (JP, A) JP-A-63-100074 (JP, A) JP-A-61-287080 (JP, A) JP-A-61-54078 (JP, A) A) Actual opening Sho 62-77466 (JP, U)

Claims (1)

(57) [Claims] 1. A rotating head, wherein two rotation tracks are formed by one rotation of the rotation head, and a digital signal is completed in one frame with the two rotation tracks as one frame. In the data recorder which is encoded and recorded and reproduced as described above, at least one frame of insignificant data is recorded every time the digital signal is recorded for a predetermined frame during recording. Data recorder.