JP2001222868A - Video device, data recording method, medium and information assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that information including errors in reproduced from a video tape as it is by a physical factor caused by many times of reproduction. SOLUTION: A D-VHS video device is provided with a first reproducing means reproducing data recorded in a video tape 1 and outputting it as a digital signal, an error detecting means detecting the error of a digital signal, an error correcting means correcting a detected error, a first recording means recording a digital signal in which an error is corrected to the prescribed recording medium as a corrected data, a second reproducing means reproducing the recorded corrected data, and a second recording means for overwriting corrected data reproduced by the second reproducing means on recorded data on the video tape 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a video device, a data recording method, a medium, and an information aggregate.

[0002]

2. Description of the Related Art A conventional digital recording system,
In the VHS video apparatus, a digital signal passed through a waveform equalizer is passed through an error correction circuit of a main LSI and recorded on a video tape in a digital system. Also,
A conventional D-VHS video device corrects a digital signal through an error correction circuit even at the time of reproducing recorded data and corrects the error-corrected digital signal instead of the information itself recorded on a video tape. It was something to play.

[0003]

However, as the video tape is repeatedly played back many times, the SNR (Signal) is reduced due to physical factors such as wear of the video tape.
to Noise Ratio) is deteriorated, and the polarity of the recorded digital signal may be erroneously determined. An error correction circuit also exists in a conventional D-VHS video device. However, if an information error exceeding the correction capability occurs due to repeated reproduction of a video tape many times, erroneous information is deleted. There was a problem of reproduction.

The present invention has been made in consideration of the above-described problems, and is intended to prevent the deterioration of the SNR of a reproduced signal due to wear of a video tape.
It is an object of the present invention to provide a video device, a data recording method, a medium, and an information aggregate that can be held down as compared with a conventional video device.

[0005]

Means for Solving the Problems The first invention (claim 1)
Corresponds to) a first reproducing means for reproducing the recorded data recorded on the video tape and outputting it as a digital signal;
Error detection means for detecting an error in the digital signal;
Error correcting means for correcting the detected error, first recording means for recording the error-corrected digital signal on a predetermined recording medium as correction data, and reproducing the recorded correction data. A video apparatus comprising: a second reproducing unit; and a second recording unit for overwriting the recording data on the video tape with the correction data reproduced by the second reproducing unit. is there.

According to a second aspect of the present invention (corresponding to claim 2), when the first reproducing means is in a predetermined state, the second reproducing means reads the correction data from the recording medium, The video device according to the first aspect of the present invention is characterized in that the signal is not output to the second recording means.

According to a third aspect of the present invention (corresponding to claim 3), the predetermined state in the first reproducing means is a state in which the video tape is being reproduced, and the reproduction of the video tape is temporarily stopped. The video device according to the second aspect of the present invention, which is in any one of the states of the present invention.

A fourth invention (corresponding to claim 4) is that, when the second recording means is in a predetermined state, the second reproducing means reads the correction data from the recording medium, The video device according to the first aspect of the present invention is characterized in that the signal is not output to the second recording means.

A fifth aspect of the present invention (corresponding to claim 5) is characterized in that the predetermined state in the second recording means is a state in which recording is being performed on the video tape. 2 is a video device of the present invention.

According to a sixth aspect of the present invention (corresponding to claim 6), when the second recording means overwrites the recording data with the correction data, the first reproducing means issues a new command. A video device according to the first aspect of the present invention, wherein the video device is not accepted.

A seventh invention (corresponding to claim 7) is the video device according to the sixth invention, wherein the new command is a command for reproducing the video tape.

According to an eighth aspect of the present invention (corresponding to claim 8), when the second recording means overwrites the recording data with the correction data, the second recording means issues a new command. A video device according to the first aspect of the present invention, wherein the video device is not accepted.

A ninth aspect of the present invention (corresponding to claim 9) is the video apparatus according to the eighth aspect of the present invention, wherein the new instruction is an instruction to execute recording on the video tape. .

A tenth aspect of the present invention (corresponding to claim 10) is that the second recording means performs the overwriting using a time code on the video tape. Video device.

The eleventh invention (corresponding to claim 11) provides:
It has a detecting means for detecting the recording position of the recording data on the video tape and / or the state of the video tape, when the second recording means performs the overwriting, the detecting means, It is detected that the recording data is not at the same recording position as when the reproduction was performed on the video tape, or that the video tape is not in a state where the second recording means can perform the overwriting. In that case, the second recording means:
A video apparatus according to a first aspect of the present invention, wherein the correction data is written or not written based on an external instruction.

A twelfth invention (corresponding to claim 12) is:
The first recording means records only the digital signal corresponding to a portion detected by the error detection means and corrected by the error correction means as the correction data. 5 is a video device of the invention.

A thirteenth aspect of the present invention (corresponding to claim 13) is:
The twelfth book, wherein the error detecting means is capable of detecting an error level of the digital signal reproduced by the first reproducing means, and detecting the error using the error level. 5 is a video device of the invention.

The fourteenth invention (corresponding to claim 14) is:
The correction data includes an information issue management unit for issuing and managing information relating to a position to be recorded on the recording data recorded on the video tape, wherein the second recording unit includes the issued information. A twelfth or thirteenth video of the present invention, wherein the correction data reproduced by the second reproducing means is overwritten on the recording position on the recording data by utilizing Device.

A fifteenth aspect of the present invention (corresponding to claim 15) is:
The second recording means, each time overwriting is performed by the first reproducing means, or based on a predetermined criterion,
The video device according to any one of the first to fourteenth aspects, wherein the correction data is overwritten.

The sixteenth invention (corresponding to claim 16) is:
The recorded data recorded on the video tape is reproduced and output as a digital signal, an error of the digital signal is detected, the detected error is corrected, and the digital signal subjected to the error correction on a predetermined recording medium is output. A data recording method, wherein the data is recorded as correction data, the recorded correction data is reproduced, and the reproduced correction data is overwritten on the recording data on the video tape.

The seventeenth invention (corresponding to claim 17) is:
A medium carrying a program and / or data for causing a computer to execute all or a part of the functions of all or part of any of the first to fifteenth aspects of the present invention, which can be processed by the computer A medium characterized by the following.

According to an eighteenth aspect of the present invention (corresponding to claim 18),
A medium carrying a program and / or data for causing a computer to execute all or a part of all or a part of the steps of the sixteenth invention, wherein the medium can be processed by the computer. Medium.

The nineteenth invention (corresponding to claim 19) is:
An information aggregate characterized by being a program and / or data for causing a computer to execute all or a part of functions of all or a part of the present invention according to any one of the first to fifteenth aspects. .

The twentieth invention (corresponding to claim 20) is:
An information aggregate characterized by being a program and / or data for causing a computer to execute all or a part of the operations of all or part of the sixteenth invention.

With the video apparatus of the present invention, for example, before the normal reproduction becomes impossible, the digital signal is returned to a normal value, and the digital signal is once saved as correction data in a built-in magnetic recording apparatus. It becomes possible to overwrite the position to be recorded on the original recording data. Therefore, deterioration of the SNR of the reproduced signal due to wear of the video tape or the like can be suppressed lower than that of the conventional video device.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration and operation of a video device according to the present embodiment will be described below with reference to FIGS. The configuration and operation of the video device according to the present embodiment will be described, and at the same time, an embodiment of the data recording method according to the present invention will be described.

As shown in FIG. 1, reference numeral 3 denotes a large-capacity magnetic device such as a hard disk drive (hereinafter, also referred to as a HDD or a large-capacity magnetic device) having a capacity capable of storing all the data of the video tape 1. This device is equipped with a recording medium.

The means including the hard disk drive 3 in the present embodiment is the first recording means of the present invention,
And means including the second reproducing means. Further, the magnetic recording medium in the present embodiment corresponds to the recording medium of the present invention.

The set top box (hereinafter, also referred to as STB) 6 has a function of receiving digital broadcasting and exchanging with the D-VHS video device 8 and a function of displaying an image on the television 7.

When the head 2 records a signal on the video tape 1, the digital broadcast signal is converted to a D-
The signal is sent to the VHS 8 and is written to the video tape 1 via the digital signal processor 4 including the waveform equalizer 5 and the error correction circuit 10. When the head 2 reproduces a signal from the video tape 1, the signal read from the video tape 1 passes through the waveform equalizer 5 and the like, then passes through the digital signal processor 4, and passes through the STB 6 and the television 7. To go.

The means including the head 2 in this embodiment corresponds to the means including the first reproducing means and the second recording means of the present invention.

FIG. 2 shows a simple structure of the digital signal processor. FIG. 3 is a flowchart showing a process until the video tape 1 is re-recorded.

The digital signal processor 4 in the D-VHS 8
Has an error correction circuit 10, a bit error detection flag adder 9, a digital interface (I / F) 12, and the like. The bit error detection flag assigning unit 9 detects an error (bit error) of a certain error level (error rate) or more corresponding to a threshold value and adds a flag for notifying the error. Bit error detection flag adder 9
Must detect an error of an error level that can be corrected by the error correction circuit 10 in the digital signal processor 4. Also, the threshold value set in the present invention is set to a value at which the error correction circuit 10 can perform error correction,
The error level of the generated error is monitored by the bit error detection flag assigning device 9 (S1, S2). When the error level reaches the threshold, the switch (SW) 11 is turned on (S3). By doing so, the signal that has passed through the error correction circuit is saved to the large-capacity magnetic recording device as correction data (S4, S5).

The bit error detection flag assigning device 9 in the present embodiment corresponds to the error detecting means of the present invention. Further, the error correction circuit 10 according to the present embodiment
Corresponds to the error correction means of the present invention.

The digital signal processor 4 has a data bus to the built-in large-capacity magnetic device 3 and has a function of writing a video reproduction signal to the large-capacity magnetic recording device 3. The digital signal processor 4 reproduces the video tape 1. However, if the reproduction is performed many times, it becomes difficult to determine whether the video reproduction signal is 0 or 1, and finally, the bit error detection flag attaching unit 9 operates. Until the occurrence of an error level equal to or higher than the set threshold is detected. When the occurrence of an error level equal to or higher than the threshold value set by the bit error detection flag assigning unit 9 is detected, communication with the large-capacity magnetic device 3 is started, and the video signal corrected by the error correction circuit 10 is corrected. (S5).

However, as shown in FIG. 6, the start point of the correction data to be saved is detected when an error level equal to or higher than the threshold set by the bit error detection flag assigning unit 9 is detected (bit error). The detection point is a point where the detection flag is turned ON, and the end point is equivalent to a few seconds (hereinafter referred to as a monitoring time) in which the error level is kept below the threshold value (below the bit error detection flag OFF). It consists of an area that is the end point of the part. FIG. 6 shows one such area as correction data to be saved.

The large-capacity magnetic device 3 describes the location of the original recording data on the video tape 1 between the start point and the end point in order to recognize the start point and the end point. Issue and manage a correction data ID for specifying an address to be executed. As described above, not the entire recording data but only the severely deteriorated portion is saved to the large-capacity magnetic device 3 as correction data, so that it takes an enormous amount of time to overwrite the correction data (hereinafter referred to as refresh). That can be avoided. Also,
Such refreshing, as well as deleting saved correction data, can be performed using the above-described correction data ID.

As described above, the correction data saved in the large-capacity magnetic recording device 3 every time a signal is reproduced from the video tape 1 is determined by using the above-described correction data ID to indicate the position on the recording data to be recorded. The position is recognized by the magnetic device 3 and is overwritten by the head 2 (S
6).

However, in FIG. 4, overwriting is performed when there is a sufficient time (S10). That is, for example, when the video is being reproduced by the D-VHS video device 8, during a pause, or when the reproduction (including fast-forward and rewind) is likely to start immediately, a large-capacity magnetic recording such as an HDD is performed. The writing from the device 3 to the video tape 1 is not performed (S7, S8). If a recording reservation is made, the writing to the video tape 1 is not performed until the recording is completed (S9). Step 6 in FIG.
(S6) corresponds to steps 7 to 10 (S7 to 1) in FIG.
0)).

In FIG. 5, when the large-capacity magnetic recording device 3 is writing to the video tape 1 (S11), a request is made to perform an operation related to the operation of the D-VHS video device 8 (S11). S12) Until writing to the video tape 1 is completed, processing other than writing to the video tape 1 is not performed (S13). This ensures that the video signal is completely written.

A detecting means for detecting the state of the video tape 1 is provided so that it is possible to consider whether or not the same video tape 1 is set at the time of reproduction when overwriting the correction data. It may be. If the video tape 1 has been removed from the D-VHS video device 8, the error-corrected data saved in the hard disk drive 3 is discarded based on, for example, a user's manual operation, or the video tape is It is possible to select whether to record the data after the error correction on a video tape that is not necessarily the same as 1.
Such a selection may be made when all the data of the video tape 1 has been subjected to error correction and saved in the hard disk drive 3.

Further, when overwriting the correction data, a detecting means for detecting the recording position of the recording data on the video tape may be provided. By executing such detection of the recording position, it is possible to prevent the correction data from being overwritten on data other than the original recording data. In short, the video apparatus of the present invention includes detection means for detecting the recording position of the recording data on the video tape and / or the state of the video tape, and detects when the second recording means performs overwriting. If the means detects that the recording data is not at the same recording position as when the reproduction was performed, or that the video tape is not in a state where the second recording means can perform overwriting, the second recording means May or may not execute writing of correction data based on an external instruction.

As described above, the large-capacity magnetic device 3 manages the correction data ID, so that the bit error detection flag applicator 9 detects the occurrence of an error level equal to or higher than the set threshold. Since the ending point of the portion corresponding to several seconds (that is, the monitoring time) that is kept below the error level after the error level becomes equal to or less than the threshold value is stored, the information is output to the screen and Can also be recognized. In addition, the deletion of the correction data can be performed by using the correction data ID.

A video tape 1 of the original recorded data
The upper recording position may be grasped using a time code written in the recording data on the video tape 1. Thus, for example, the D-VHS video device 8
The time code of the recorded data is recorded and managed in the hard disk drive 3 even when the power of the device is turned off. Therefore, when the power of the D-VHS video device 8 is turned on again, the correction data is accurately overwritten on the position to be recorded on the original recording data.

Further, the video device of the present invention
By managing the data in the large-capacity magnetic device 3 such as the HDD with the correction data ID, the correction data corresponding to the inferior part is re-recorded on the video tape, so that the refresh time is shortened and the video tape is worn. Can be suppressed. Further, for example, in order to avoid refreshing the fine data many times, when the fine data to be refreshed continues, the monitoring time for saving the correction data is set to be slightly longer, and the start point and the end point described above are set. By reducing the number of regions sandwiched between the large-capacity magnetic device 3, it is possible to perform control such as preventing the number of accesses to the hard disk in the large-capacity magnetic device 3 from increasing.

The error detecting means of the present invention has detected the error level of the digital signal reproduced by the first reproducing means of the present invention. However, the present invention is not limited to this.

The information issuance management means of the present invention is included in the large-capacity magnetic device 3 in the above-described embodiment, and the information on the recording position of the present invention is stored in the above-described embodiment of the present invention. In the embodiment, the correction data ID is used. However, the present invention is not limited to this, and the information issue management unit of the present invention may not be provided in the first place. In such a case,
For example, correction data obtained by performing error correction on all digital signals obtained by reproducing recorded data is overwritten on the original recorded data. It goes without saying that the smaller the size of the correction data to be overwritten, the more it is possible to suppress the progress of the wear of the video tape. However, such an apparatus having a simple configuration can be manufactured at low cost. There is an advantage.

Further, the overwriting of the correction data in the present invention does not need to be executed every time the recording data is reproduced by the first reproducing means of the present invention as in the above-described embodiment. It may be executed when the user gives an instruction, or may be executed every time the reproduction is performed a predetermined number of times. In short, the second recording means of the present invention may overwrite the correction data each time the overwriting is performed by the first reproducing means of the present invention or based on a predetermined standard.

The function of each component of the video apparatus of the present invention may be realized by dedicated hardware, or may be realized by software using a computer program.

Also, by creating a medium holding a program and / or data for causing a computer to execute all or a part of the functions of all or part of the above-described means, and using the medium, The read program and / or data may execute the same operation as described above in cooperation with the computer.

Further, by creating a medium holding a program and / or data for causing a computer to execute all or a part of the operations of all or some of the steps of the above-described embodiment, and utilizing the medium, The read program and / or data may execute the same operation as described above in cooperation with the computer.

Further, an information aggregate characterized by being a program and / or data for causing a computer to execute all or a part of the functions of all or part of the above-described embodiment is prepared. By utilizing, the read program and / or data structure may cooperate with a computer to perform the same operation as described above.

Further, an information aggregate characterized by being a program and / or data for causing a computer to execute all or a part of the operations of all or part of the above-described embodiment is prepared. By utilizing, the read program and / or data structure may cooperate with a computer to perform the same operation as described above.

Here, the data includes a data structure, a data format, a type of data, and the like. Further, the medium includes a recording medium such as a ROM, a transmission medium such as the Internet, and a transmission medium such as light, radio waves, and sound waves. The carried medium includes, for example, a recording medium on which a program and / or data is recorded, a transmission medium for transmitting the program and / or data, and the like. In addition, to be able to be processed by a computer means that, for example, in the case of a recording medium such as a ROM, it can be read by a computer. Including that it can be handled by a computer as a result of the transmission. The information aggregate includes, for example, software such as programs and / or data.

As is evident from what has been described above, the video device of the present invention may have a lower S.D.
Even if the NR is degraded, the threshold value is set to a value that can be corrected by the error correction circuit 10 so that the erroneously detected digital signal can be corrected using the error correction circuit.
The information after error correction is saved in the magnetic recording medium and then overwritten on the recording position on the recording data of the video tape, and the original video is correctly reproduced as long as the video tape has the inherent recording capability it can.

Further, the video device of the present invention
A video deck for performing digital recording, which is a device having a built-in high-capacity magnetic recording medium and having a function of performing error correction and improving the error caused by wear of the video tape. It is characterized by a function, and even if a digital signal error occurs due to the physical factor of reproduction many times, if the error does not greatly exceed the correction capability of the error correction circuit, the error correction circuit And using a large-capacity magnetic recording device to overwrite the position to be recorded on the recording data of the video tape, thereby realizing that a digital signal without error is always recorded on the video tape. .

Also, the video device of the present invention
Means for detecting an error level equal to or higher than a threshold value set in the digital signal reproduced from the video tape, means for performing error correction on the digital signal being reproduced when the above error occurs, Means for recording a signal on a built-in magnetic recording medium, means for overwriting a digital signal recorded on the magnetic recording medium on a position to be recorded on recording data on a video tape, and means for controlling the timing of this recording. It is provided. As a result, even if an error occurs in digital signal detection due to a physical factor of reproduction many times, if the error does not greatly exceed the correction capability of the error correction circuit, the digital signal is returned to a normal value. Then, the original digital signal is always recorded on the video tape by saving the correction data once in the built-in magnetic recording device and then overwriting the recording position on the recording data. .

Further, the video device of the present invention
When the video tape is being reproduced, is being immediately reproduced, or is in a recording reservation state, data on the magnetic recording medium is not overwritten on the video tape. Thus, when it is not possible to secure time to write all the correction data to the video tape due to the amount of correction data after error correction on the large-capacity magnetic recording medium, the correction data is transferred from the large-capacity magnetic recording device to the video tape. I do not write.

Further, the video device of the present invention
Even if the operation on the video tape becomes necessary while the correction data stored on the large-capacity magnetic recording medium after error correction is being written to the video tape, the operation on the video tape is invalidated, It is characterized in that the recording is continued in the following manner. This ensures that data is completely written.

As is apparent from the above description, the video apparatus of the present invention corrects an information detection error caused by deterioration of the SNR due to physical factors such as abrasion of a video tape, and has a built-in video device. By utilizing the capacitive magnetic recording device, the data recorded first is held almost as it is on the video tape. Therefore, even if the reproduction of the video tape is repeated many times, a beautiful video can be reproduced.

The video device described above includes:
For example, a D-VHS video device for performing digital recording, which has a built-in large-capacity magnetic recording medium and has a function of correcting an error generated due to wear of a video tape,
VHS VCR is included.

[0062]

As is apparent from the above description, the present invention is characterized in that the deterioration of the SNR of the reproduced signal due to wear of the video tape or the like can be suppressed lower than that of the conventional video device. , Data recording method,
Media and information aggregates can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram of a D-VHS apparatus and peripheral devices according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram inside a digital signal processor according to the embodiment of the present invention;

FIG. 3 is a flowchart (1) when writing to a video tape according to the embodiment of the present invention;

FIG. 4 is a flowchart (2) when writing to a video tape according to the embodiment of the present invention;

FIG. 5 is a flowchart for another request that occurs when writing to a video tape according to the embodiment of the present invention.

FIG. 6 is an explanatory diagram of data saved to a large-capacity magnetic device according to the embodiment of the present invention

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Video tape 2 Head 3 Hard disk drive (HDD, large capacity magnetic device) 4 Digital signal processor 5 Equalizer (EQ) 6 Set top box (STB, Set To)
p Box) 7 Television 8 D-VHS video device 9 Bit error detection flag adder 10 Error correction circuit 11 (ON when error level reaches threshold) Switch (SW) 12 Digital interface (I / F)

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) H04N 5/7826 H04N 5/782 Z 5/92 5/91 L 5/937 5/92 H 5/93 C

Claims (20)

[Claims] A first reproducing unit that reproduces recorded data recorded on a video tape and outputs a digital signal; an error detecting unit that detects an error in the digital signal; and an error that corrects the detected error. Correcting means, first recording means for recording the error-corrected digital signal on a predetermined recording medium as correction data, second reproducing means for reproducing the recorded correction data, and the second A second recording unit for overwriting the correction data reproduced by the reproduction unit with the recording data on the video tape. 2. When the first reproducing means is in a predetermined state, the second reproducing means reads the correction data from the recording medium and does not output the correction data to the second recording means. The video device according to claim 1, wherein: 3. The method according to claim 1, wherein the predetermined state in the first reproducing means is one of a state in which the video tape is reproduced, and a state in which the reproduction of the video tape is temporarily stopped. 3. The video device according to claim 2, wherein: 4. When the second recording means is in a predetermined state, the second reproducing means reads the correction data from the recording medium and does not output it to the second recording means. The video device according to claim 1, wherein: 5. The video apparatus according to claim 4, wherein the predetermined state in said second recording means is a state in which recording is being performed on said video tape. 6. The apparatus according to claim 1, wherein when the second recording unit overwrites the recording data with the correction data, the first reproducing unit does not accept a new command. Video equipment. 7. The video device according to claim 6, wherein the new command is a command to play the video tape. 8. The apparatus according to claim 1, wherein when the second recording unit overwrites the recording data with the correction data, the second recording unit does not accept a new command. Video equipment. 9. The video camera according to claim 8, wherein the new command is a command to execute recording on the video tape.
A video device as described. 10. The video apparatus according to claim 1, wherein the second recording means performs the overwriting using a time code on the video tape. 11. A recording device for detecting a recording position of the recording data on the video tape and / or a state of the video tape, wherein when the second recording device performs the overwriting, If the detecting means detects that the recording data is not at the same recording position as when the reproduction was performed on the video tape, or the video tape can perform the overwriting by the second recording means. 2. The video apparatus according to claim 1, wherein the second recording unit executes or does not execute the writing of the correction data based on an external instruction when it is detected that the correction data is not in the state. . 12. The first recording means stores only the digital signal corresponding to a portion detected by the error detection means and corrected by the error correction means.
2. The video device according to claim 1, wherein the video data is recorded as the correction data. 13. The method according to claim 1, wherein the error detecting means can detect an error level of the digital signal reproduced by the first reproducing means, and detects the error using the error level. The video device according to claim 12. 14. An information issuance management unit for issuing and managing information on a position of the correction data to be recorded on the recording data recorded on the video tape, wherein the second recording unit includes: 14. The recording medium according to claim 12, wherein the issued data is used to overwrite the correction data reproduced by the second reproducing means on the recording position on the recording data. Video equipment. 15. The method according to claim 15, wherein the second recording unit overwrites the correction data each time the first reproducing unit executes overwriting or based on a predetermined criterion. 15. The video device according to any one of 1 to 14. 16. Reproducing recorded data recorded on a video tape and outputting it as a digital signal, detecting an error in the digital signal, correcting the detected error, and performing the error correction on a predetermined recording medium. Recording the reproduced digital signal as correction data, reproducing the recorded correction data, and overwriting the reproduced correction data on the recording data on the video tape. 17. A medium carrying a program and / or data for causing a computer to execute all or a part of the functions of all or part of the present invention according to any one of claims 1 to 15. A medium which can be processed by a computer. 18. A medium carrying a program and / or data for causing a computer to execute all or a part of the operations of all or some of the steps of the present invention according to claim 16 and processed by the computer. A medium characterized by what is possible. 19. A program and / or data for causing a computer to execute all or a part of the functions of all or a part of the present invention according to any one of claims 1 to 15. Information aggregate to do. 20. An information aggregate, which is a program and / or data for causing a computer to execute all or part of all or part of the steps of the present invention according to claim 16.