JPH041981A - Digital tape recording system for picture data - Google Patents

Abstract

PURPOSE:To reduce the possibility of the discordance produced between the record data and the control data despite the occurrence of a system down by recording the latest control data at a position near the picture or sound data on a continuous-length recording medium every time the picture or sound data of a prescribed unit are recorded. CONSTITUTION:The picture data inputted to an input/output terminal 10 are recorded on a digital audio tape 12, for example, and at the same time these data are read out of the tape 12 and outputted to the terminal 10 after reproduction. When the picture data #n of at least a single unit is recorded on the tape 12, the control data TOC#n related to the picture data #n to be recorded are recorded at a position near an area of the tape 12 where the picture data #n of at least a single unit is recorded. Thus the possibility is minimized for the discordance caused between the recorded picture and control data even though a system down is produced after the picture or sound data are recorded.

Description

[Detailed Description of the Invention] Abundant and defective! The present invention relates to a digital data recording method, in particular to a long rewritable recording medium such as a magnetic tape, in which images and (
or) relating to a method for recording digital data of audio signals.

As a recording medium that sequentially records digital data,
So-called digital audio tapes are often used. Digital audio tapes are suitable for recording not only audio signals but also image signals. For example, when digital data representing an image is recorded on a digital audio tape, the contents of the image data, such as control data such as the title of each page and the number of recordings, are generally recorded on the tape as a table of contents (TOC). be. This TOO data is used as control data for searching and reproducing specific image or audio data recorded on the digital audio tape.

Conventionally, TOC data has been recorded in a specific position on the tape, for example, at the beginning of the tape, for the entire image data recorded on one digital audio tape. For example, when an image recording/playback device records image data onto a digital audio tape or modifies and re-records already recorded image data, these image tapes are first recorded onto the tape, and the TOC data is transferred to the device. The TOC data formed by recording or modifying the 6-sided image data that is formed and updated on the internal memory is read out from the internal memory before the tape is ejected when the recording operation is finished and the tape is ejected. written to a predetermined location on the tape.

Therefore, if the recording/playback device system goes down for some reason, such as a power outage or unplugging the power cord, before this ejection operation, the TOC data will not be written or updated from the device to the tape, and the TOC data will be stored in the internal memory. The TOC data is lost or the tape is later ejected. A digital audio chip that encounters such a situation may contain a contradiction between the image data recorded thereon and the τOC data, and the TOC data may not correctly correspond to the recorded contents of the image data. Therefore, if you later try to play such a tape, the TO
Since C is not updated correctly, the lotus image data recorded on the tape may not be reproduced.

Objective: The present invention overcomes the drawbacks of the prior art and minimizes the possibility of mismatch between recorded image data and control data even if a system error occurs after recording image or audio data. The purpose of this invention is to provide a digital tape recording method for image data.

According to the present invention, in a digital tape recording method for image data in which digital image data is sequentially recorded on a long recording medium, when recording at least one unit of image data on the recording medium, recording on the recording medium is performed. Control data related to the image data being displayed is recorded in the vicinity of the area in which at least the 14th image data is recorded on the recording medium.

According to the present invention, an image data digital tape recording apparatus that sequentially records digital image data on a long recording medium is provided with control data that creates control data related to image data recorded on the recording medium. The control means includes a creating means, a recording means for recording the image data and the control data on the recording medium, and a control means for controlling the control data creating means and the recording means to record the image data and the control data on the recording medium. When recording at least one unit of image data on a recording medium, the control data creation means updates the control data for the at least one unit of image data, and updates the control data to record the at least one unit of image data on the recording medium. The recording means records information in the vicinity of the recorded area.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of a digital tape recording system for an image tape according to the present invention will be described in detail with reference to the accompanying drawings. 1st
The embodiment of the present invention shown in the figure records image data input to an input/output terminal 10 on a long rewritable recording medium such as a magnetic tape, for example, a digital audio tape 12. This is an image recording and reproducing apparatus that reads out these data and reproduces and outputs them to an input/output terminal 1O.

This image recording/reproducing device has an image memory 14 connected to an input/output terminal 1O. In this embodiment, the image memory 14 is
It is a temporary storage device in which image data representing one unit of image, for example, one frame, is stored in the form of digital data. The read/write timing and address designation are controlled by the memory control unit 22.
The image memory 14 is connected to a recording/reproducing section 18 via a switch circuit 16 as shown. The recording/reproducing unit 18 is a recording/reproducing mechanism into which a digital audio tape 12 is removably loaded, records image data on the tape 12 at required timing, and reads out image data from the tape 12.

Although the switch circuit 1B is conceptually expressed in the form of a contact, it is an electronic selection circuit that selectively connects the recording/reproducing section 18 to the image memory 14 or the TOO memory 20. The switch circuit 16 is a point! ! As schematically shown at 126, it is under # control of the system control unit 28. TOC memory 20
is a temporary storage area used by the system control unit 28 as a work area for forming and holding control data of the tape 12, and also has a part of the control data creation function. This control data includes control data such as the contents of the image data recorded on the tape 12, such as the title of each page, the number of recorded images within a page, and the number of recorded images on the entire tape, that is, a table of contents. represent

The timing of reading and writing, address designation, etc. are controlled by a separate memory control unit 24.

These two memory control units 22 and 24, the switch circuit 1B, and the recording/playback unit 18 are controlled by a system control unit 28. The system control unit 28 is a control circuit that controls the entire apparatus to write and read image data to and from the tape 12, and to create, update, write, and read control data, that is, TDC data. To explain in more detail, in the image data recording operation, the memory control section 22 is controlled to cause the image data arriving at the input/output terminal 10 to be stored in the image memory 14. Further, in the reproduction operation, image data is read from the image memory 14 and output to the terminal IO.

In recording image data, the system control section 28 controls the switch circuit 16 to connect the image memory 14 to the recording/reproducing section 18 . Therefore, the operation timing of the memory control section 22 and the recording/reproducing section 18 is instructed to read image data from the image memory 14 and record it onto the tape 12. Along with the recording of image data, the other memory control section 24, switch circuit 16, and recording/playback section 18 are controlled to store the TOC memory 1.
4, TOC data is read out from the memory 20 and recorded on the tape 12.

In the image data reproduction operation, the system control section 28 first controls the switch circuit 18 to connect the recording/reproducing section 18 to the TOC memory 20. Therefore, the recording/reproducing section 18 and the memory control section 24 are controlled to read out the TOC data from the tape 12 and store it in the TDC memory 20. This TOC
identify the position on the tape 12 where the desired image data is recorded based on the data, control the recording/reproducing section 18, the switch circuit 1B, and the memory control section 22 to extract the image data from the tape 12; The image is stored in the image memory 14.

By the way, in the conventional system, the TOC data is recorded at the beginning of the digital audio tape 12. In this embodiment, instead of or in addition to this, when image data representing one image is recorded on the tape 12. , is configured to record TOO data following that storage location.

for example! $2 As shown in the diagram, the system control unit 28 outputs the WJnth image data 11! When + is recorded on the tape 12, TOO data J1 is recorded thereafter. In the figure, the direction of recording and reproducing data on the tape 12 is indicated by an arrow A.

More specifically, the nth image data @n is transferred to the tape 12.
When recording one image data, the system control unit 28 records one image data
Create TOC data for Tape 1 by then.
Regarding the image data recorded in TOC memory 2
This updates the TOC data held at 0. When the recording of the n-th image data Iln onto the tape 12 is finished, the system control unit 28 controls the TOO memory 20
The TOC data for all recorded images from then on are extracted and recorded after the image data sn on the tape 12. Similarly, image data @]+1 of the next image is written after this TOC data 114, and TOC data 11+l updated by this writing is recorded thereafter as shown. In this example, the following area 12a
nothing is recorded.

When reproducing image data from the digital audio tape 12 on which images and TOC data have been recorded in this manner, the system control unit 28 first searches the unrecorded portion 12a of the tape 12 for the position where the latest TOC data 1111+l is recorded. . When the recording position of the TOC data 1B+l is detected, the TOC data 111*l is read into the TOC memory 20. From then on, the recording position of the desired image data on the tape 12 is determined by the above-described playback operation, and the image data is The image is read into the image memory 12. In this method, the tape 12 is used as an unrecorded area! The latest valid TOC data 11!1+1 can be accessed immediately during playback without having to rewind from the beginning of 2a.

In this embodiment, one digital audio chip 1
TOC data will be recorded at multiple locations in 2.

Among them, the TOC located at the leading edge in the running direction A of the tape 12, that is, at the beginning of the unrecorded area 12a.
Data 1+l is the latest one. In the case of an image data recording/reproducing device, the amount of TOC data is much smaller than image data, so even if a method such as this in which TOC data remains in multiple locations is used, the recording efficiency of the entire tape, that is, the unit length, will be reduced. This does not affect the number of images that can be recorded.

When recording new image data n÷1 on tape 12,
The system control unit 28 may be configured to erase or overwrite the TOO data $n previously recorded on the tape 12 and record the next image data 111+l. And when newly recording image data ltl+l in rotation as shown in FIG. 2B,
The system control unit 28 searches the tape 12 in the opposite direction to the recording direction A from the unrecorded area 12a to find the latest T.
The area where the OC data @n is recorded is detected. When the TOC data l1fi is read into the TOC memory 20 and identified as the latest TOC data, the tape 12 is run in the forward direction A and the TOC data area 11
New image data 11+l is recorded on the tape 12 from the beginning 12b of fi. Of course, new TOC data 1+l is recorded at the end, as shown in FIG. 3B.

Furthermore, as shown in FIG. 4, the conventional method of recording TOO data at the beginning 12c of the tape 12 may be used in combination with any of the methods in the embodiments of the present invention described above. FIG. 4 shows that each time image data is recorded, the TOC data that has been updated remains on the tape 12.
An example is shown in which the latest TOC data is also recorded at the beginning. Of course, the overwriting method shown in FIGS. 3A and 3B is used to overwrite the previously recorded TOC data and record the image data and the latest TOC data that follows, and also to record the image data and the latest TOC data at the end 1 of the tape 12. The latest TOC data may also be recorded.

An embodiment in which the present invention is applied to an image recording/reproducing device has been described.
The present invention is not limited to this. For example, T
Although the OC data was recorded immediately after the recording area of one unit of image data in the above-described embodiment, the control data may be recorded following the recording of multiple units of image data. Furthermore, the control data recording area does not necessarily need to be recorded in contact with the image data recording area, and may be recorded at intervals in the vicinity thereof. Furthermore, the present invention can be effectively applied to an image and audio recording device that records audio signals related to the image signals in the form of digital data on a long rewritable recording medium such as a magnetic tape. Applicable. Alternatively, it may be an audio-only recording device.

Effects According to the present invention, each time a predetermined unit of image or audio data is recorded, the latest control data is recorded near the image or audio data on the elongated recording medium. Therefore, even if a system failure of the device occurs after recording image or audio data, the possibility of a mismatch between the recorded image or audio data and the control data is minimized. In addition, in the conventional method, TOC data is recorded in the beginning area of the digital tape and is rewritten each time recording is completed, but due to system failure etc.
If OC data is damaged, it becomes unplayable. With the present invention, such a situation does not occur. Furthermore, when playing back a long recording medium, in the conventional method, it is necessary to rewind it to the beginning. However, with the Bokuto method, such rewinding is not necessary and the control data can be accessed in a short time from the position on the medium where recording ended.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram showing an embodiment in which the present invention is applied to an image recording and reproducing apparatus that records image data on a digital audio tape and reads and plays it back. FIGS. 2, 3A, 3B, and FIG. 4 is an explanatory diagram showing an example of recording of images and control data in the embodiment shown in FIG. Explanation of symbols of main parts 12, , Digital audio chip 12a, , Unrecorded area 18, , Recording/playback unit 20, , TOC memory 22.24. , Memory control unit 28, System control unit Patent applicant: Fuji Photo Film Co., Ltd. Agent Number: Takao Maruyama

Claims (1)

[Claims] 1. In a digital tape recording method for image data in which digital image data is sequentially recorded on a long recording medium, the method records at least one unit of image data on the recording medium. digital tape recording of image data, characterized in that control data related to the image data recorded on the recording medium is recorded near an area in the recording medium where the at least one unit of image data is recorded; method. 2. A digital tape recording device for image data that sequentially records digital image data onto a long recording medium, the device comprising: control data for creating control data related to image data to be recorded on the recording medium; creating means; recording means for recording the image data and control data on the recording medium; and control means for controlling the control data creating means and the recording means to record the image data and control data on the recording medium. and the control means, when recording at least one unit of image data on the recording medium, updates the control data for the at least one unit of image data by the control data creation means, and updates the control data with respect to the at least one unit of image data. A digital tape recording apparatus for image data, characterized in that the recording means records data in the vicinity of an area of the medium where the at least one unit of image data is recorded.