JPH03216867A - Digital data recording ad reproducing device - Google Patents

Abstract

PURPOSE:To omit the recording of information about the number of amble frames of each data block and to surely detect a starting frame of a data by providing 1st and 2nd recording means, a reproducing means, a recording starting control means, a reproducing starting control means and a storage means. CONSTITUTION:The subject device is arranged to include the 1st recording means for forming a data block area on a tape, the 2nd recording means for recording a frame number and a data block number in a specified areas provided previously on a track, and the reproducing means for reproducing the data recorded by the 1st recording means and the frame number and the block number recorded by the 2nd recording means. The device is provided also with the recording starting control means for controlling the starting of the recording of a data and the reproducing starting control means for controlling the starting of the reproducing of the recorded data. By this method, the recording of the number of amble frames in the data block is omitted, and the starting frame of the data can surly be detected.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to recording or reproducing digital data using a tape as a recording medium and recording or reproducing digital data in units of preset data blocks. This invention relates to a digital data recording and reproducing apparatus that controls the start of a frame number using frame number information.

Conventional technology In recent years, digital recording and playback technology has come to be applied to a wide range of fields, and in particular has made remarkable progress in the field of digital audio, with rotary head type digital audio tape recorders (DAT) being put into practical use. It has been reached. On the other hand, attempts have been made to apply digital data recording and reproducing technology using rotary head type tapes such as DAT as recording media to auxiliary recording devices for computers. These devices sequentially record digital data provided from a computer instead of digitized audio data in data blocks that are a preset amount of data format, and when playing back, they record digital data provided from a computer in the same way as for audio applications. , which reads digital data and outputs it as data blocks, making it possible to record, reproduce, and store extremely large amounts of data.

In addition, for data in data block units, an ampoule frame is provided to prevent frames of adjacent data blocks from being destroyed when splicing or overwriting data, and the frame number of the first frame of the data block is set in advance. This value is taken as an ampoule frame, and the period between that frame and a preset number of frames is defined as an ampoule frame, and recording and reproduction of data is started from the frame after the ampoule frame.

FIG. 6 shows an example of a data block recorded by a conventional technology configuration. Let the first data block area be the data block F1, and let the arbitrary data area be the data block G. A data block consists of a data area in which data from the data buffer 10 is recorded and an ampoule area which is a set of ampoule frames, and data block F records the data start frame number of each data block.

The frame number of the first frame at which data recording starts is the frame number of the first frame of the data block.
, where the number of ampoule frames is a frame, it becomes m+a.

Problems to be Solved by the Invention However, in the above-described conventional configuration, the frame number at which data recording or reproduction is started changes in synchronization with the change in the number of ampoule frames. Therefore,
The first problem is that during a recording operation, information on the number of ampoule frames of each data block is recorded in a preset area, and during a playback operation, this information must be reproduced every time, which consumes a lot of time and space. When the frame number of the first frame of data cannot be reproduced due to a data error or other factors, the start frame of data in the data block cannot be detected and the tape must be rewound again for playback, resulting in a large number of errors. Second, spending time
There is a third problem that if the information on the number of frames of the preset ampoule frame cannot be reproduced due to a data error or the like, it cannot be reproduced forever.

The present invention is intended to solve the above-mentioned conventional problems, and an object thereof is to provide a digital data recording and reproducing apparatus that realizes efficient recording and reproducing of a data block area.

Means for Solving the Problems In order to achieve the above object, the digital data recording/reproducing apparatus of the present invention includes a first recording means for forming a data block area on a tape, and a first recording means for forming a data block area on a tape, and a first recording means for forming a data block area on a tape. a second recording means for recording in a predetermined specific area; and a reproducing means for reproducing the data recorded by the first recording means and the frame number and data block number recorded by the second recording means. a recording start control means for controlling the start of recording of data; and a reproduction start control means for controlling the start of reproduction of the recorded data, the recording start control means comprising a first comparison procedure and a first comparison procedure. The reproduction start control means includes a second comparison procedure, a second detection procedure, a first calculation procedure, a second calculation procedure, a third comparison procedure, and a third comparison procedure. Detection Procedure and First Effect According to the present invention, with the above-described configuration, the frame number of the start frame of data in a data block can be set to a preset value regardless of the number of frames of ampoule frames, and There is no need to record and play back the frame number of the data start frame of the block in a preset area, and during playback operation, one or more frames from a plurality of preset consecutive frames in the data block are used. If the frame number can be reproduced, it is possible to normally instruct the reproduction means to control the start of reproduction.

Embodiments Hereinafter, embodiments of the digital data recording/reproducing apparatus of the present invention will be described with reference to the drawings.

First, FIG. 1 is a block diagram showing the configuration of a digital data recording/reproducing apparatus according to an embodiment of the present invention.

In Figure 1, 1 is a cassette half, 2 is a reel, and 3 is a cassette half.
is a tape, 4 is a cylinder, 5a and 5b are heads, 6 is a capstan that runs the tape 3, 7 is a mechanism control unit that controls the operations of the reel 2, cylinder 4, and capstan 6, and 8 is a mechanism control unit that controls the operation of the reel 2, cylinder 4, and capstan 6. A digital signal is encoded and a recording signal is supplied to the heads 5a+5b, and in the reproduction operation, the heads 5a. 5b is a signal processing section which separates a track synchronization signal from the reproduction signal obtained from the reproduction signal, transmits the track synchronization signal to the mechanism control section 7, decodes the reproduction signal, and outputs a digital signal; A communication unit that sends and receives information to and from external devices,
10 is a data buffer that temporarily stores the digital data transmitted and received by the communication unit 9, and 11 is a data buffer that temporarily stores digital data transmitted and received by the communication unit 9; The signal processing unit 8 uses the data block number, which is a unique identification number of a data block formed from a plurality of frames, as auxiliary data.
This is an auxiliary data processing unit that extracts and outputs frame numbers and data block numbers during playback operations. 1
2 transmits the frame number and data block number to the auxiliary data processing section 11 during the recording operation, and the data buffer 1
0 to the signal processing unit 8, receives the frame number and data block number from the auxiliary data processing unit 11 during playback operation, and calculates the difference between the received frame number and a preset frame number. The calculated value is temporarily stored in the data storage unit 13, the stored value is subtracted by 1 at the cycle of one frame, and the data is transferred from the signal processing unit 8 to the data buffer 10 according to the subtracted value. 14 is a recording/playback start control unit that controls, and 14 transmits a frame number and a data block number to the auxiliary data processing unit 11 and the recording/playback start control unit 12 during a recording operation, and supplies them from the auxiliary data processing unit 11 during a playback operation. This is a recording/playback control unit that receives the frame number and data block number. 15 is a system control unit that inputs control information from the communication unit 9 and controls a series of recording and reproducing operations.

The operations of the digital data recording and reproducing apparatus of this embodiment configured as described above include a data recording operation and a reproducing operation, which will be explained in detail below.

First, the data recording operation will be explained. In FIG. 1, the recording/reproducing control section 14 provides the frame number and data block number to the auxiliary data processing section 11 and the recording/reproducing start control section 12 during the recording operation, and sends the frame number and data block number to the mechanism control section 7 via the system control section 15. The mechanism control unit 7 applies tension to the reel 2 according to the control command, rotates the capstan 6 at a constant speed to drive the tape 3 at a constant speed, and further drives the cylinder 4 at a constant speed. Rotate. The signal processing section 8 is an auxiliary data processing section 11
The auxiliary data given from the recording/playback start control section 12
By processing the main data given from the data bath sofa 10 and adding a track synchronization signal, converting it into a track formation signal and sequentially outputting it to the heads 5 al 5 b, diagonal tracks are created on the retape 3. are formed continuously.

Next, the recording and reproducing control unit 14 also performs basic control regarding data reproducing operations. In FIG. 1, a recording/reproduction control section 14 gives an operation command to a mechanism control section 7 via a system control section 15.

The signal processing section 8 extracts a track synchronization signal from the playback signals output from the heads 5a and 5b, and sends the track synchronization signal to the mechanism control section 7.
Output to. The mechanism control unit 7 applies tension to the reel 2 and synchronizes the rotational speed of the capstan 6 and the rotational phase of the cylinder 4 based on the track synchronization signal, thereby controlling the head 5a. 5b to the track formed on the tape 3 accurately. On the other hand, the signal processing section 8 processes the reproduced signal and sends the auxiliary data to the auxiliary data processing section 11.
The main data is output to the data buffer 10 respectively. The auxiliary data processing unit 11 stores frame numbers and data block numbers as auxiliary data to the recording and reproduction start control unit 1.
2, the recording/reproduction start control unit 12 sequentially transfers the main data temporarily stored in the data buffer 10 to the communication unit 9 as data based on the data block number and the value stored in the data storage unit 13. By starting the process, the data recorded on the tape 3 can be read out accurately.

FIG. 2 shows the track pattern on the tape 3 formed by the above recording operation. In FIG. 2, one track shown at A is composed of an auxiliary data recording area shown at B, a track synchronization signal recording area shown at C, and a main data recording area shown at D. Also,
On the tape 3, as shown in E, a plurality of tracks having the same structure as the track shown in A are successively constructed.

FIG. 3 shows an example of a data block recorded according to the arrangement of the present invention. Let I be an arbitrary data block, and let H be the immediately adjacent data block. The data block consists of a data area and an ampoule area, and the frame number of the first frame in which data recording of data block H starts is assumed to be n. If the number of ampoule frames is b frames, the frame number of the first frame of data block H is n-b.

Next, the data recording start operation will be described using the data block H in FIG. 3 as an example and the flowchart in FIG. 4. Note that the flowchart shows an example in one frame section, and the data block number of data block H is assumed to be H.

In step 1, the recording/reproduction start control unit 12 determines whether the data block number given from the recording/reproduction control unit 14 is H or not. If the data block number is not H, the process ends; if the data block number is H, the process advances to step 2. In step 2, it is determined whether the frame number given from the recording/reproduction control unit 14 is n-α. If the frame number is n-α, the process advances to step 3, and if it is not n-α, the process ends. Step 3
Then, the data buffer 10 is commanded to start recording data, and the process ends. Note that α is the number of frames that is the difference between the frame number synchronized with the timing of transmitting data from the data buffer 10 to the signal processing unit 8 in advance and the frame number n in order to record data from the frame with frame number n. be.

Next, the data reproduction operation will be explained using the flowchart of FIG. 5, taking the data block H of FIG. 3 as an example.

Note that the flowchart shows an example in one frame section.

In step 4, the recording/reproduction start control section 12 determines whether the data block number given from the auxiliary data processing section 11 is H or not. If the data block number is not H, the process ends; if the data block number is H, the process advances to step 5. In step 5, it is determined whether the frame number given from the auxiliary data processing section 11 has been reproduced. If the data can be reproduced, the process proceeds to step 6; if the data cannot be reproduced, the process proceeds to step 9. Next, if the frame number reproduced in step 6 is less than or equal to n+β, the process proceeds to step 7, and if it is greater than n+β, the process ends. Step 7
Then, the value obtained by subtracting the reproduced frame number from n+β is set as the frame counter.

Next, the process proceeds to step 8, where the counter flag is set to 1, and the process proceeds to step 9. If the counter flag is 1 at step 9, step. Proceed to Step 10, and if O, the process ends. If the frame counter is O in step 10, the process proceeds to step 12, and if the frame counter is not O, the process proceeds to step 11. Step 11 subtracts 1 from the frame counter, updates it as a new frame counter, and ends the process. The program advances to step 12, instructs the data buffer 10 to start data reproduction, and advances to step 1. In step 13, the counter flag is set to the old value and the process is terminated. Note that β is the number of frames that is the difference between the frame number and frame number n synchronized with the timing of transmitting data from the signal processing unit 8 to the data buffer 10 in order to reproduce data from the frame with frame number n.

As described above, according to this embodiment, the start of recording and reproducing data of each data block can be realized reliably and in a short time.

In addition, the mechanism control section 7, the auxiliary data processing section 11, the recording and reproduction start control section 12, the data storage section 13, the recording and reproduction control section 14, and the system control section 15i'! Although the control units are each independent, they may be integrated and configured using a microcomputer and realized as software.

Effects of the Invention As described above, the digital data recording and reproducing apparatus of the present invention includes a first recording means that forms a data block area on a tape, and a frame number and a data block number that are recorded in a predetermined specific area on a track. a second recording means for recording data on a second recorder; a reproducing means for reproducing the data recorded by the first recording means and a frame number recorded by the second recording means; By comprising a recording start control means for controlling, a reproduction start control means for controlling the start of reproduction of recorded data, and a storage means for temporarily storing data from the recording start control means,
By omitting the recording of information on the number of amplifier frames in each data block, the time spent on recording and reproducing operations can be reduced, and by managing the reproduced frame number, the start frame of data in a data block can be reliably set. It has excellent features such as easy detection.

[Brief explanation of drawings]

FIG. 1 is a digital data recording/reproducing device according to the present invention. FIG. 4 is a block diagram of a data block according to the present invention, FIG. 4 is a flowchart of a data recording operation according to the present invention, and FIG. 5 is a flowchart of a data reproducing operation according to the present invention. FIG. 6 is a configuration diagram of a conventional data block. 1...Cassette half, 2...Reel, 3
...Tape, 4...Cylinder, 5a,
5b...Head, 6...Capstan, 7
... Mechanism control section, 8... Signal processing section, 9
...Communication Department, 10...Data Buffer 11
... Auxiliary data processing unit, 12... Recording and reproduction start control unit, 13... Data storage unit, 14... Recording and reproduction control unit, 1-5... System control unit. Figure 5

Claims (4)

[Claims] (1) A communication means for transmitting and receiving digital data and control information from an external device, and a set of frames consisting of a plus azimuth track and a minus azimuth track, and forming a data block area on the tape containing data obtained from the communication means. a frame number that is a unique identification number of a frame that is completed within a data block; and a data block number that is a unique identification number of a data block that is complete in content and is formed by a plurality of frames; a second recording means for recording the data in a predetermined specific area on the track; and a second recording means for recording the data recorded by the first recording means and the second recording means.
reproducing means for reproducing the data block number and frame number recorded by the recording means; recording start control means for controlling the start of recording of data obtained from the communication means into the data block; A digital data recording/reproducing apparatus comprising: reproduction start control means for controlling the start of reproduction of data recorded by the first recording means. (2) The recording start control means includes a first comparison procedure for comparing a frame number recorded by the second recording means with a preset frame number, and a first comparison procedure for detecting the preset frame number. 2. The digital data recording and reproducing apparatus according to claim 1, comprising: a detecting procedure as described above; and a recording operation instruction procedure for instructing said first recording means to start a data recording operation. (3) The reproduction start control means includes a second comparison procedure for comparing the frame number obtained from the reproduction means and a preset frame number, and a second detection procedure for detecting the preset frame number. and a first instructing the reproducing means to start a data reproducing operation.
2. The digital data recording and reproducing apparatus according to claim 1, comprising a reproducing operation instruction procedure. (4) The reproduction start control means includes a first calculation procedure for calculating a difference between a frame number reproduced by the reproduction means and a preset frame number, and a value calculated by the first calculation procedure. The second step is to subtract 1 frame by frame.
a storing step of recording the value calculated by the second calculating means in a storing means; and a third comparing step of comparing the value stored by the storing step with a preset value. , a third detection procedure for detecting that the value stored by the storage procedure is equal to the preset value; and a second reproduction operation instruction procedure for instructing the reproduction means to start a data reproduction operation. 2. A digital data recording and reproducing apparatus according to claim 1, comprising: