JPH04355275A - Magnetic recording device - Google Patents

Abstract

PURPOSE:To expand the application area of a magnetic recording device by diverting the magnetic recording device consisting of, specifically, a digital audio tape recorder to an external device such as computer, etc. CONSTITUTION:After first dummy data composed of a prescribed length of a magnetic tape from its start end part is recorded, a series of data composed of second dummy data DM2, main recording data DATA and third dummy data DM3 are consecutively recorded. Accordingly, the data can be recorded without fail regardless of the difference of the recording start position of respective digital audio tape recorder to be used for recording non-audio data. Thus the magnetic recording device consisting of a digital audio tape recorder can be diverted to the external device such as computer, etc.

Description

[Detailed description of the invention]

0001

[Table of Contents] The present invention will be explained in the following order. Industrial application fields Conventional technology Problems to be solved by the invention Means for solving the problems (Figs. 1, 5 and 6) Effects (Figs. 1, 5 and 6) Example (1) Overall configuration (Figure 1) (2) Format of digital signals (DA1, DA2) (Figures 2 to 4) (3) Data recording format (Figures 5 and 6) (4)
Effects of the embodiments (FIGS. 1, 5, and 6) (5) Effects of the invention of other embodiments

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording device, and is particularly suitable for use when a digital audio tape recorder is used as an external recording device for a computer, for example.

0003

2. Description of the Related Art Conventionally, in this type of magnetic recording device, recording tracks are sequentially formed diagonally on a magnetic tape so that digital audio signals can be recorded and reproduced (hereinafter referred to as a digital audio tape recorder). There is.

[0004] In this type of digital audio tape recorder, after converting an audio signal into a digital signal, interleaving processing is performed at a predetermined period.
Recording is done by adding an error detection and correction code,
This effectively avoids the effects of dropout, etc.
It is designed to record high-quality audio signals at high density.

Furthermore, this type of digital audio tape recorder is capable of inputting and outputting digital audio signals of a predetermined format (IEC-458 standard) via a predetermined interface circuit, so that digital audio signals of a predetermined format (IEC-458 standard) can be input and output from, for example, a compact disc player. By directly recording the output digital audio signal, it is possible to effectively avoid deterioration in sound quality caused by analog-to-digital conversion processing and digital-to-analog conversion processing.

[0006]

[Problem to be solved by the invention] By the way, this type of DA
It would be convenient if T could be used as an external storage device for a computer or the like.

[0007] That is, the DA connected to the audio device
If the connection of the DAT can be switched and the DAT can be used as an external storage device as needed, it is thought that the field of application of the DAT can be expanded and the usability can be improved.

However, in a DAT that records such audio data, the position from the beginning of the magnetic tape to the actual start of data recording is different from each DAT.
The timing at which data recording actually starts differs for each DAT with respect to the start identification code (hereinafter referred to as start ID) used as an identification code to locate the beginning of each recorded data. etc., the recording position cannot be accurately specified, and in this case, there is a risk that data will remain unerased, resulting in a problem that the recorded data cannot be reproduced correctly.

The present invention has been made in consideration of the above points, and it is an object of the present invention to propose a magnetic recording device that can be used as an external storage device for computers and the like.

0010

[Means for Solving the Problem] In order to solve the problem, in a first invention, a magnetic recording device 1 is configured to record main recording data DATA consisting of non-audio data to a digital audio tape recorder 3.
, the main recording data DA is recorded from the starting end of the magnetic tape 20 loaded in the digital audio tape recorder 3.
First dummy data DM1 representing a state in which TA is not recorded
A predetermined length of data is recorded, and a series of data consisting of second dummy data DM2, main recording data DATA, and third dummy data DM3 are sequentially recorded following the first dummy data DM1.

Further, in the second invention, a start identification code (START ID) for specifying the recording position of the main recording data DATA corresponds to the second dummy data DM2.
be recorded.

Furthermore, in the third invention, the time added to the recording time of the second dummy data DM2 and the third dummy data DM3 is equal to the start identification code (START).
ID) shall be at least twice the recording time.

[0013]

[Operation] After recording first dummy data for a predetermined length from the starting end of the magnetic tape 20, a series of data consisting of second dummy data DM2, main recording data DATA, and third dummy data DM3 follows. By sequentially recording data, data can always be recorded reliably regardless of the digital audio tape recorder used for recording non-audio data.

[0014] Furthermore, by recording a start identification code (START ID) corresponding to the recording position of the second dummy data DM2, it is possible to always start regardless of the digital audio tape recorder used for recording non-audio data. The main recording data DATA can be reliably reproduced when the identification code is detected.

Furthermore, by making the sum of the recording times of the second dummy data DM2 and the third dummy data DM3 more than twice the recording time of the start identification code, even when the high-speed feed mode is executed, The start identification code for each main recording data DATA can be reliably detected, and thereby the recording position of each main recording data DATA can be reliably specified.

In this way, the magnetic recording device 3 made of a digital audio tape recorder can be used as an external storage device such as a computer 4.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

(1) Overall configuration In FIG. 1, 1 indicates a computer system as a whole, and data is input and output between a digital audio tape recorder (DAT) 3 and a computer 4 via an input/output device 2. A digital audio tape recorder 3 is used as an external storage device for a computer 4. That is, the computer 4 inputs and outputs desired data to and from the input/output device 2 via the bus BUS.

The input/output device 2 converts the input data D1 inputted from the computer 4 into a digital signal DA1 according to the format standardized by IEC-458.
The digital signal DA1 is output to the digital audio tape recorder 3.

The digital audio tape recorder 3 receives the digital signal DA1 in place of the digital audio signal, records the digital signal DA1 sequentially, and is thereby able to easily record the data D1 of the computer 4. There is.

Further, in the digital audio tape recorder 3, by switching the operation mode to a reproduction mode, the reproduced data is converted into a digital signal DA2 according to the IEC-458 standard and then sequentially output.

When the digital audio tape recorder 3 enters the playback mode, the input/output device 2 converts the digital signal DA2 outputted from the digital audio tape recorder 3 into original data D2 in accordance with the IEC-458 standard. The data D2 is output to the computer 4.

[0023] With this, the computer 4 can connect the digital audio tape recorder 3 as necessary, and
The digital audio tape recorder 3 can be used as an external storage device.

(2) Digital signals (DA1, DA2)
As shown in FIG. 2, according to the IEC-458 standard, frame data from frame 0 to frame 191 are consecutively formed into digital signals DA1 and DA2 (FIG. 2(A)). In the recorder 3, two recording tracks are formed at a cycle of 0 to 191 frames corresponding to the digital signals DA1 and DA2.

The frame data (FIG. 2(B)) is formed of subframe data of two consecutive channels, and in the digital audio tape recorder 3, each subframe data is assigned to the right and left channels, respectively, and the data shown in FIG. The data are recorded sequentially in the format shown.

That is, in the digital audio tape recorder 3, each recording track is divided into two recording areas in the longitudinal direction, and thereby one interleaving period (
(corresponding to the period from frame 0 to frame 191), four recording areas are formed.

For these four recording areas, the digital audio tape recorder 3 records the recording tracks TA of positive azimuth angle from frame 0 to frame 191, respectively.
Among the frame data up to the frame, the even-numbered frame data of the first channel is sequentially recorded in the first recording area, and then the odd-numbered frame data of the second channel is recorded in the second recording area. Further, the digital audio tape recorder 3 records the even-numbered frame data of the second channel in the first recording area for the subsequent recording track TB with a negative azimuth angle, and then records the odd-numbered frame data of the first channel in the second recording area. Record in the recording area.

Furthermore, at this time, in the digital audio tape recorder 3, after interleaving the subframe data within each recording track TA, TB,
The data is recorded with an error detection and correction code attached thereto, so that the reproduced data can be subjected to error correction processing for each recording track.

As a result, in the digital audio tape recorder 3, at the time of playback, after changing the arrangement of the playback data in the opposite manner to that at the time of recording, the playback data that could not be error corrected is interpolated based on the previous and succeeding playback data. By doing so, for example, one of the recording tracks TA or T of the pair is
Even if dropout occurs in B, the generation of abnormal noise can be effectively avoided.

In each subframe data (FIG. 2(
C)) The first 4 bits are allocated to a synchronization preamble, the following 4 bits are allocated to transmitting auxiliary data, and the following 20 bits are used to transmit desired transmission data.

Therefore, in the digital audio signal of the IEC-458 standard, audio data is assigned to the transmission data DX, and the digital audio tape recorder 3 extracts the audio data from the transmission data DX and converts it into a recording signal. This makes it possible to record digital audio signals.

On the other hand, the first 1 bit V of the following 4 bits is assigned to a validity flag indicating validity/invalidity of the audio data, and in the digital audio tape recorder 3, when the playback data is interpolated, the flag is is set to "1".

The following 1 bit U is assigned to a user bit flag.

The following 1 bit C is allocated to channel status data, and the remaining 1 bit P is allocated to parity bit. As a result, in the digital audio tape recorder 3,
By sequentially detecting user bits U and channel status C for frame data from frame 0 to frame 191, information regarding transmission data can be detected.

That is, as shown in FIG. 4, in channel status C, control data is transmitted from frame 0 to frame 5. For example, when transmitting 2 channels of pre-emphasized audio data, the control data is set to "0x100". ” and
When copying is prohibited, "X" is set to "0". Furthermore, in channel status C,
The next 6 and 7 frames of frame data represent the mode, and the next 8 to 15 frames of frame data transmit the category code.

In the digital audio tape recorder 3, user bits U, channel status C, etc. are allocated and recorded in a subcode recording area and a subdata recording area depending on their contents, for example, sampling frequency, etc. Regarding the information, the operation is changed depending on the content.

Furthermore, the digital audio tape recorder 3 is designed to detect bit errors in the input digital signal DA1 based on the parity bit P.

(3) Data recording format FIG. 5(A)
A digital audio tape recorder (
The magnetic tape 20 (hereinafter referred to as DAT) 3 has a leader tape 21 provided at the starting end and a non-recording area 22 where data is not recorded, which is a maximum length of 100 mm in the longitudinal direction.
, and is allocated to the tape path system, which is a non-recordable area of the DAT 3 loaded with the magnetic tape 20.

Further, a dummy data recording area is provided following the non-recording section 22 to indicate a state in which the main recording data DATA is not recorded, and "00" is written as first dummy data DM1 in the dummy data recording area. By recording for 60 seconds, the length from the starting end of the magnetic tape 20 to the position where recording or playback can actually start is different.
Even when T is used, variations in recording or reproduction start positions can be absorbed and previously recorded data can be reliably erased using the dummy data.

Therefore, it is possible to prevent the generation of unerased data, and thereby the recorded data can be accurately reproduced.

Furthermore, at the starting end of the magnetic tape 20,
In general, recording or reproducing errors may occur due to dropouts, or steps may occur on the magnetic tape 20 due to steps on the reel around which the magnetic tape 20 is wound, making it impossible to correctly record or reproduce data. ,
Even in this case, data can be accurately recorded or reproduced by providing a dummy data recording area DM1 at the starting end of the magnetic tape 20 so that this area is not used as a recording area for the main recording data DATA. It is done like this.

When the recording of the dummy data DM1 is completed, a start identification code (hereinafter referred to as start ID) for specifying the recording position of the recording data DATA is inserted into the user data recording area in a predetermined section (FIG. 5(B) ST A.R.
A) It is designed to be recorded.

This start ID is recorded by setting the user bit U of each subframe data (FIG. 2(C)) to "1", and is recorded once per drum rotation. ing.

That is, as shown in FIG. 5(C), the SYNC bit and start ID transmitted as user data
, among the shortening IDs, the start ID is assigned to the frame of the second sample word R0, and while the second sample word R0 is set to "1", this is recorded as the start ID. being done.

Therefore, after recording the dummy data in the dummy data recording area DM1, by setting the second sample word R0 to "1" for 300±30 rotations of the drum, the start ID is recorded for 9 seconds. is being done.

Therefore, even if the high-speed feed mode is executed by the shortening ID, the start I
D can be detected reliably.

At the same time as the recording of the start ID is started, "00" is recorded as dummy data DM2 for one second in the area following the dummy data DM1, and then the main recording data DATA is recorded.

[0048] Therefore, even when using DATs with different times from detecting the start ID to actually reading data during playback, by absorbing variations in the playback start position, data can be reliably read based on the start ID. Recorded data DATA can be read out.

Further, "00" is subsequently recorded for 17 seconds as dummy data DM3 at the end of the data DATA.

As a result, the total time of dummy data DM2, main recording data DATA, and dummy data DM3 is 1.
Because it is always longer than 8 seconds (that is, twice the recording time of the start ID), after "1" is set as the start ID for 9 seconds, "0" is set in the start ID recording area for 9 seconds or more. Ru.

Therefore, even when the high-speed feed mode is executed, the start ID for each main recording data DATA can be detected, thereby making it possible to reliably specify the recording position of each recording data.

Furthermore, by recording the dummy data DM3, it is possible to once record the main recording data DATA1 and then execute the recording mode again to record the second main recording data DATA2 as shown in FIG. Even in this case, the dummy data DM3 acts as a guard band to prevent the previously recorded recording data DATA1 from being accidentally erased.

Therefore, by recording the dummy data DM3, each recording data DATA1, DATA2, . . . can be reliably recorded.

[0054] Thus, the dummy data DM1, DM2, D
By recording M3 and the start ID, the recorded data DATA can be reliably recorded and reproduced.

(4) Effects of the Embodiment According to the above configuration, after recording the dummy data DM1 for a predetermined length from the starting end of the magnetic tape, the second dummy data DM1 is subsequently recorded.
By sequentially recording a series of data consisting of the dummy data DM2, the main recording data DATA, and the third dummy data DM3, it is possible to start recording data after the magnetic tape 20 is once rewound to the starting end. In addition, when the start position of each main recording data DATA is detected and playback of the main recording data DATA is started, furthermore, after the main recording data DATA that has been recorded, other main recording data DATA is detected.
When recording by splicing data, data can always be recorded reliably regardless of DATs having different recording start positions.

Furthermore, by recording the start ID corresponding to the recording position of the second dummy data DM2, the start ID can always be detected regardless of the difference in the playback start position of each DAT used for data recording. The recorded data can be reliably reproduced when the data is stored, and the sum of the recording times of the second dummy data DM2 and the third dummy data DM3 is at least twice the recording time of the start ID. Accordingly, each main recording data DATA
Each start ID can be reliably identified.

(5) Other embodiments In the above embodiments, the dummy data DM1, D
Although the case has been described in which data consisting of "00" is recorded as M2 and DM3, the present invention is not limited to this.
Various data can be used as long as it is different from the recording data DATA.

Furthermore, in the above-described embodiment, a case was described in which the first dummy data DM1 was recorded for 60 seconds, but the present invention is not limited to this, and various other time periods can be applied.

Furthermore, in the above embodiment, the case where the second dummy data DM2 was recorded for one second was described, but the present invention is not limited to this, and various other time periods can be applied.

Further, in the above embodiment, the case where the third dummy data DM3 was recorded for 17 seconds was described, but the present invention is not limited to this.
The total recording time of M2 and third dummy data DM3 may be set to be at least twice the recording time of the start ID (9 seconds).

Further, in the above embodiment, the start I
Although the case where D was recorded for 9 seconds has been described, the present invention is not limited to this, and the point is that the start ID can be reliably detected in the high-speed feed mode.

Furthermore, in the above embodiment, a case has been described in which a start ID is recorded in order to detect the data recording position, but the present invention is not limited to this. The position of recorded data may also be detected.

Furthermore, in the above-described embodiment, a case has been described in which data outputted from a computer is recorded, but the present invention is not limited to this, and can be applied to recording data outputted from various measuring devices, image data, etc. It can be widely applied when

[0064]

As described above, according to the present invention, after the first dummy data is recorded for a predetermined length from the starting end of the magnetic tape, the second dummy data, the main recording data, and the third dummy data are recorded. By sequentially recording a series of data consisting of dummy data, it is possible to reliably record the main recording data regardless of the difference in the recording start position of each digital audio tape recorder used for recording non-audio data. can.

Furthermore, by recording the start identification code in correspondence with the recording position of the second dummy data, the playback start position of each digital audio tape recorder used for recording non-audio data is independent of the difference in playback start position. Main recording data can be reliably reproduced whenever a start identification code is detected.

Furthermore, by making the sum of the recording times of the second dummy data and the third dummy data more than twice the recording time of the start identification code, even when the high-speed feed mode is executed, each recording The start identification code for each data can be reliably detected, and thereby the recording position of each main recording data can be reliably specified.

[0067] In this way, a magnetic recording device made of a digital audio tape recorder can be used as an external storage device for a computer or the like.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of a computer system according to the present invention.

FIG. 2 is a schematic diagram for explaining digital signals of a computer system.

FIG. 3 is a schematic diagram showing a recording format.

FIG. 4 is a chart for explaining channel status.

FIG. 5 is a schematic diagram showing a recording format of dummy data and a start ID.

FIG. 6 is a schematic diagram showing a format when transmitting data is continuously recorded.

[Explanation of symbols]

1...computer system, 2...input/output device, 3...
... Digital audio tape recorder, 4 ... Computer, 20 ... Magnetic tape, 21 ... Leader tape section, 22 ... Non-recording section, DM1, DM2, DM3 ... Dummy data, STARA ... Start identification code recording area.

Claims (3)

[Claims] 1. A magnetic recording device configured to record main recording data consisting of non-audio data in a digital audio tape recorder, wherein the main recording data is recorded from the starting end of a magnetic tape loaded in the digital audio tape recorder. The first one indicates the state where no data is recorded.
A predetermined length of dummy data is recorded, and a series of data consisting of second dummy data, main recording data, and third dummy data is sequentially recorded following the first dummy data. magnetic recording device. 2. A magnetic recording apparatus according to claim 1, wherein a start identification code for specifying a recording position of said main recording data is recorded in correspondence with said second dummy data. 3. The magnet according to claim 2, wherein the total recording time of the second dummy data and the third dummy data is at least twice the recording time of the start identification code. Recording device.