JP2003259270A - Data recorder, image recorder, and data recording method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To minimize loss of information to be recorded, at the time of operation restoration of a secondary recording medium after a break of power supply with respect to a data recorder which records data in an external recording medium and the secondary recording medium annexed to the external recording medium. <P>SOLUTION: When an event of data write to an IC memory 10b occurs due to operation input on an input part 5, a memory control part 4a copies recorded data in the IC memory 10b to a backup memory 6 at each time after recording data according with the write event in the IC memory 10b through a memory R/W 23a. New data is not written in the IC memory 10b till copy processing is normally terminated. In the case that power supply is broken during write operation to the IC memory 10b, the memory control part 4a reads out data recorded in the backup memory 6 at the time of power restoration and copies the data to the IC memory 10b through the memory R/W 23a. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording apparatus for recording data on an external recording medium and a secondary recording medium attached to the external recording medium, a data recording method, and image data for such an external recording medium. The present invention relates to an image recording device for recording.

[0002]

2. Description of the Related Art In recent years, video cameras for picking up and recording moving images have become widespread in general households. Current video cameras mainly use cassette type magnetic tapes as recording media. Further, recently, in many cases, a secondary recording medium made of a non-volatile semiconductor memory is mounted in a cassette case of a magnetic tape.

Information about the recorded contents such as the title of the image recorded on the magnetic tape and the date at the time of shooting is recorded on the secondary recording medium, and the information on the secondary recording medium is read first when the magnetic tape is reproduced. Therefore, it is possible to grasp the outline of the recorded contents on the magnetic tape. Therefore,
When using such a function, usually, immediately after the recording of the moving image on the magnetic tape ends, some information is recorded on the secondary recording medium by the input operation of the user.

[0004]

By the way, since the video camera is often carried outdoors for use, it is often operated by a power supply from a battery equipped with a dedicated battery. For this reason, the battery is often exhausted during use, and the battery is often replaced.

The power supply may be cut off even during the recording operation on the secondary recording medium as described above. For example, normally, the user determines the remaining time that can be photographed by looking at the display of the battery remaining amount, but when the display of the battery remaining amount becomes very short, the user may voluntarily replace the battery. If the battery is removed immediately after the user performs a recording operation on the secondary recording medium, it takes some time from the recording operation to the normal end of the recording operation on the secondary recording medium. If the timing of taking out the data is early, the information will not be correctly recorded on the secondary recording medium. Such a situation may occur when the connection cord is pulled out at the time of operation by AC input from a household outlet, in addition to contact failure of the battery, dropping of the battery from the mounting portion, and the like.

Therefore, when the power supply from a new battery or the like is restarted after this, the operation of the secondary recording medium is in an error state because the recording operation is incomplete. In this case, a method such as reformatting is used to restore the operation of the secondary recording medium, and much information is lost.

The present invention has been made in view of the above problems, and when the recording operation on the secondary recording medium is abnormally terminated due to the disconnection of the power supply, the loss of the information to be recorded is minimized. An object of the present invention is to provide a data recording device capable of returning the operation of the next recording medium.

Another object of the present invention is to operate the secondary recording medium while minimizing the loss of information to be recorded when the recording operation to the secondary recording medium ends abnormally due to the disconnection of the power supply. It is to provide a data recording method capable of being restored.

[0009]

In order to solve the above problems, the present invention provides a data recording apparatus for recording data on an external recording medium and a secondary recording medium associated with the external recording medium, wherein the recording of the secondary recording medium is performed. A built-in recording medium for backing up data is provided, and each time a recording operation is performed on the secondary recording medium, the backup operation is performed on the built-in recording medium, and the backup operation is completed. There is provided a data recording device characterized by not performing new data recording on the secondary recording medium.

In such a data recording apparatus, since new data recording on the secondary recording medium is not executed until the backup operation for the recording data on the secondary recording medium to the built-in recording medium is completely completed, at least two. Either the secondary recording medium or the built-in recording medium always maintains a normal recording state, and the recording state of the secondary recording medium is guaranteed.

When the power supply to the entire apparatus is cut off in a state where the recording operation on the secondary recording medium is incomplete, the recording data of the built-in recording medium is transferred to the secondary recording medium when the power supply is restarted. On the contrary, if the power supply is cut off while the backup operation to the built-in recording medium is incomplete, the backup operation to the recorded data of the secondary recording medium should be executed again when the power supply is restarted. May be. As a result, the recording state of the secondary recording medium is assured even when the power supply is cut off during the recording operation on either the secondary recording medium or the built-in recording medium.

Further, according to the present invention, in a data recording method for recording data on an external recording medium and a secondary recording medium attached to the external recording medium, the secondary recording is performed each time a recording operation is performed on the secondary recording medium. Performs a backup operation of the recording data of the medium to the built-in recording medium,
A data recording method is provided, in which new data recording is not performed on the secondary recording medium until the backup operation is completely completed.

In such a data recording method, new data recording on the secondary recording medium is not executed until the backup operation for the recording data on the secondary recording medium to the built-in recording medium is completely completed. Either the secondary recording medium or the built-in recording medium always maintains a normal recording state, and the recording state of the secondary recording medium is guaranteed.

Further, when the power supply is cut off in the state where the recording operation on the secondary recording medium is incomplete, the recording data of the internal recording medium is copied to the secondary recording medium when the power supply is restarted, On the contrary, when the power supply is cut off while the backup operation for the built-in recording medium is incomplete, the backup operation for the record data of the secondary recording medium may be executed again when the power supply is restarted. . As a result, the recording state of the secondary recording medium is assured even when the power supply is cut off during the recording operation on either the secondary recording medium or the built-in recording medium.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, a video camera or a VTR is used as an external recording medium for recording data.
An example is a cassette-type magnetic tape that is used by being set in a (video tape recorder) or the like. In the cassette type magnetic tape illustrated here, a semiconductor memory, which is a secondary recording medium for separately recording information such as a title, a date, and a recording position of an image recorded on the magnetic tape, is mounted in a cassette case. By reading the data from the semiconductor memory, it is possible to grasp the recorded contents of the magnetic tape.

A digital video camera using a cassette type magnetic tape having such a semiconductor memory will be described below as an example. FIG. 1 is a block diagram showing a configuration example of a digital video camera according to an embodiment of the present invention.

In the digital video camera 1 shown in FIG. 1, a video cassette 10 having a magnetic tape 10a and an IC memory 10b is set to record a picked-up image on the magnetic tape 10a and the recorded contents of the magnetic tape 10a. This is a device for recording information in the IC memory 10b. This digital video camera 1
Video recording / playback unit 2 for picking up an image and recording / playback
And a display unit 3 for displaying the imaged and reproduced images,
A control microcomputer 4 for controlling the entire apparatus, an input unit 5 for operation input by a user, a backup memory 6 for backing up recorded data in the IC memory 10b, and each of the IC memory 10b and the backup memory 6. It is composed of a management information memory 7 for managing the recording state. Further, each block in the device except the management information memory 7 operates by the power supply from the removable battery 8a, and the management information memory 7 operates by the power supply from the independent auxiliary battery 8b.

The video recording / reproducing unit 2 picks up an image and outputs a digital image signal accordingly, and a video encoder 22 that compresses the output image signal and encodes it into a predetermined data format.
And the magnetic tapes 10a and I in the video cassette 10.
It comprises a tape deck section 23 for writing / reading data to / from the C memory 10b, and a video decoder 24 for decoding the image signal read from the magnetic tape 10a.

The image pickup block 21 includes an optical system including a lens on which light is incident from a subject, an iris, and a camera section having an image pickup element such as a CCD (Charge Coupled Device) for photoelectrically converting the incident light, and a camera section. It is composed of a camera signal processing unit (both not shown) that performs signal processing such as conversion of output signals into digital signals, noise removal, image quality correction, conversion into luminance / color difference signals, and the like. The video encoder 22 performs a compression / encoding process on the image signal output from the imaging block 21 based on a predetermined moving image data format.

The tape deck 23 is used for the video cassette 1
0 and the magnetic tape 10a, a recording / reproducing mechanism (neither shown) such as a rotary head for writing / reading data to / from the magnetic tape 10a, and an I mounted on the video cassette 10.
A memory R / W (reader / writer) 23a for writing / reading data to / from the C memory 10b is provided. The IC memory 10b is, for example, an EEPROM (Electr
512 bytes, which is composed of a non-volatile semiconductor memory such as a physically erasable and programmable ROM).
Alternatively, it has a storage capacity of 2 kbytes.

The video decoder 24 is used in the tape deck section 2.
The image signal read from the magnetic tape 10a by 3 is subjected to decompression / decoding processing based on a predetermined moving image data format.

The display unit 3 also processes the output image signals from the image pickup block 21 and the video decoder 24,
For example, an image being picked up (a so-called camera through image) or a reproduced image from the magnetic tape 10a is displayed on a monitor (not shown) configured by an LCD (Liquid Crystal Display) or the like. Further, the control microcomputer 4 receives information indicating the state of the inside of the digital video camera 1 such as the operation mode and various settings according to the instruction input signal from the input unit 5 or the remaining amount of the removable battery 8a. Is displayed on-screen on the monitor.

The control microcomputer 4 is a control processing unit for controlling each circuit block of the digital video camera 1, and controls the operation of each circuit block such as recording / reproducing operation based on an instruction input signal from the input unit 5. To do. Further, the control microcomputer 4 includes a memory control unit 4a that controls the data writing / reading operation to / from the IC memory 10b by the memory R / W 23a and the data writing / reading operation to / from the backup memory 6. The control microcomputer 4 also uses the IC memory 10b as described later.
Also, management information for managing the recording state of the backup memory 6 is recorded in the management information memory 7, and the management information memory 7 is referred to when the power is restored after the removable battery 8a is attached.

The input unit 5 is composed of a button switch for operating the recording / reproducing operation on the magnetic tape 10a, a selection switch for selecting an operation mode, and the like, and controls an instruction input signal according to the operation by the user. Output to the microcomputer 4.

The backup memory 6 is, for example, an EEP.
It is composed of a non-volatile semiconductor memory such as a ROM, and holds a copy of the data recorded in the IC memory 10b under the control of the memory controller 4a. Therefore, the backup memory 6 has a storage capacity equal to or larger than that of the IC memory 10b.

The management information memory 7 is a DRAM (Dynamic RA) operated by the power supply from the auxiliary battery 8b.
M) and the like, and holds management information for managing the recording states in the IC memory 10b and the backup memory 6.

The basic recording / reproducing operation of the image signal in such a digital video camera 1 is performed as follows. Before the image recording operation, under the control of the control microcomputer 4, the image signal captured by the image capturing block 21 is sent to the display unit 3 and displayed as a camera through image. From this state, when an operation input for image recording is performed in the input unit 5, the captured image signal is sent from the image capturing block 21 to the video encoder 22 and data compression processing is performed to convert it into digital data of a predetermined data format. To be converted. The converted data is sent to the tape deck unit 23, subjected to a predetermined modulation process and the like, and then recorded on the magnetic tape 10a.

When an operation input for image reproduction is performed in the input section 5, the image data recorded on the magnetic tape 10a is read and reproduced by the tape deck section 23 and expanded by the video decoder 24. After being done
It is displayed on the display unit 3.

Although not shown, the digital video camera 1 is equipped with a sound collecting mechanism for audio and an encoding / decoding processing unit for audio signals, in addition to the recording / reproducing mechanism for the image signals. It is also possible to record an audio signal as well as an image signal on the magnetic tape 10a. Further, the digital video camera 1 can be operated by using an AC power supply from a household outlet in addition to the removable battery 8a, but the description thereof is omitted here.

Next, the I mounted on the video cassette 10
A data write operation to the C memory 10b will be described. Information related to images and sounds recorded on the magnetic tape 10a can be recorded in the IC memory 10b. For example, the title of the recorded image content,
Information such as a summary of recorded contents, date and time of recording, and recording position information on the magnetic tape 10a of recording data corresponding to these information are recorded. Further, depending on the capacity of the IC memory 10b, for example, it is possible to record the data of a still image extracted from the moving image recorded on the magnetic tape 10a. Such an information recording operation to the IC memory 10b is performed by
It can be basically performed at an arbitrary timing by an operation input by the user using the input unit 5, but it is usually performed after the recording operation on the magnetic tape 10a is completed.

In this digital video camera 1, when data is recorded in the IC memory 10b, the recorded data is always copied to the backup memory 6 so that the data is recorded when the power supply is suddenly cut off during the recording operation. Guarantee the data that was used.

The disconnection of the power supply described in the following description is not a normal power-off operation by operating the power switch of the input section 5, but is caused by, for example, the forcible removal of the removable battery 8a or an impact. This means that the power supply is abnormally cut off due to an unintended reason such as dropping.

FIG. 2 is a diagram schematically showing the flow of data when a write event occurs in the IC memory 10b. In FIG. 2, the display of the memory R / W 23a is omitted for the sake of simplicity.

When information is recorded in the IC memory 10b, a write event is generated by an operation input from the input section 5 (step S201). Upon detecting this write event, the memory control unit 4a transfers predetermined data corresponding to the write event to the memory R / W 23a and writes it in the IC memory 10b (step S202). Next, the memory control unit 4a uses the IC memory 10b to protect the recorded data in the IC memory 10b when the power supply is cut off.
The recording data of is copied to the backup memory 6 (step S203). In this way, the IC memory 10
The recording data is copied to the backup memory 6 every time the write operation is performed on the data b.

Here, the memory control unit 4a writes new data and reads the recording data after the writing operation to the IC memory 10b and before the copying operation of the recording data to the backup memory 6 is normally completed. The IC memory 10b for control is controlled not to be accessed. Therefore, when the power supply is cut off, the IC memory 10b and the backup memory 6
That is, any one of the record data of 1) holds the normal record state.

As a result, when the power supply is cut off during the data writing operation to the IC memory 10b or the backup memory 6, the recording data in the normal recording state is restored after the power supply is restored. By copying to the other recording medium, the loss of recorded data can be minimized and the operation of the IC memory 10b can be quickly restored.

By the way, the memory controller 4a uses the I
During the recording operation on the C memory 10b and the backup memory 6, the management information for managing the recording state of each recording medium is recorded on the management information memory 7 at any time. This management information is recorded, for example, as flag information indicating whether or not write access is being performed to the IC memory 10b and the backup memory 6, respectively.

Since the management information memory 7 is driven by the auxiliary battery 8b, it has a memory control section 4a and a memory R / W.
This management information is retained even when the power supply to 23a and the like is cut off. Then, as will be described later, this management information is set to I when the power supply is restored after abnormally cut off.
It is referred to by the memory control unit 4a in order to determine the recording states of the C memory 10b and the backup memory 6.

Next, the control of the recording medium by the memory control section 4a including the abnormal disconnection of the power supply will be described. FIG. 3 is a state transition diagram showing transitions of basic control states of the IC memory 10b and the backup memory 6 by the memory control unit 4a. Note that, in FIG. 3, the IC memory 10b is simplified as the memory A, and the backup memory 6 is simplified as the memory B.

First, the state transition when an access to the IC memory 10b occurs will be described. During recording standby in the IC memory 10b, the state becomes S301, and I
It is possible to access the C memory 10b for writing and reading. This state S301 includes the time of displaying a camera through image on the display unit 3, the operation of writing the captured image signal on the magnetic tape 10a, and the time of the reproducing operation of the magnetic tape 10a.

Next, by inputting an operation from the input unit 5, I
When an access to write or read data to the C memory 10b occurs and the access occurrence is detected via the control microcomputer 4, the process shifts to the state S302 to control the memory R / W 23a to control the IC memory 10b.
Is accessed.

When the IC memory 10b is accessed for reading data, after the read operation is completed, the process returns to the state S301 and the IC memory 1 is restarted.
0b is set to the accessible state. Also, IC
If the memory 10b is accessed for writing data, the state S30 is set after the write operation is completed.
Move to 3.

In the state S303, the data recorded in the IC memory 10b is read and the backup memory 6 is read.
Is copied to. Then, after the write operation to the backup memory 6 is completed, the process returns to the state S301 and shifts to the accessible state to the IC memory 10b again.

In this way, when a write access to the IC memory 10b occurs, the IC memory 10b
The new access to the IC memory 10b is not permitted until not only the data writing operation to the backup memory 6 but also the subsequent data writing (copying) operation to the backup memory 6 is completed. Therefore, during the normal operation in which the power supply is not cut off, the data recorded in the IC memory 10b is surely copied in the backup memory 6.

As described above, these states S3
In 01, S302, and S303, the memory control unit 4a records management information for managing each recording state of the IC memory 10b and the backup memory 6 in the management information memory 7 as needed.

The above states S301, S302 and S3
In S03, when the power supply is suddenly cut off due to, for example, the detachable battery 8a falling off, the state S30
Go to 4. The state transition when the power supply is restored from this state S304 will be described below.

When the power supply is restored from the state S304 by, for example, connecting a new charged removable battery 8a, the state shifts to the state S305 and the IC memory 10b and the backup memory 6 at this point are restored. Each recording state is determined. This determination of the recording state is performed by referring to the management information for the recording state recorded in the management information memory 7.

Here, if the IC memory 10b is in the accessible state S301 when the power supply is cut off, and if the IC memory 10b is being accessed for reading in the state S302, the IC memory 10b and the IC memory 10b are accessed. Since both recording states of the backup memory 6 are normal, it is possible to shift from the state S305 to the state S301 and immediately shift to the accessible state for the IC memory 10b again.

When the power supply is cut off, the state S302 is set.
If a write access to the IC memory 10b is in progress, the recording state of the IC memory 10b becomes an error state, and the access to the IC memory 10b becomes impossible. In this case, state S305 to state S30
6, the data recorded in the backup memory 6 is copied to the IC memory 10b to restore the data. When the copying operation is completed, the state shifts to state S301.

In this way, when the IC memory 10b is in an error state, the data held in the backup memory 6 is written back to the IC memory 10b, whereby the operation of the IC memory 10b is restored and the recorded data is recorded. Losses are minimized.

When the power supply is cut off, the IC memory 1
In the case of the state S303 in which the recording data of 0b is being copied to the backup memory 6, the recording state of the backup memory 6 is an error state, and therefore the state S
The state shifts from 305 to state S303, and the IC memory 10b
The recorded data of 1 is copied again to the backup memory 6. When this copying operation is completed, the state S3
Move to 01.

As described above, the record data in the backup memory 6 is updated with the latest data requested to be recorded in the IC memory 10b. Therefore, immediately after this, even when the power supply is cut off again during the write access to the IC memory 10b, when the power is restored, the data recorded before the occurrence of the write event immediately before that is restored in the IC memory 10b. This makes it possible to minimize the loss of recorded data when the IC memory 10b returns to operation.

In order to always restore the operations of the IC memory 10b and the backup memory 6 after the power is restored in this way, it is necessary to disallow removal of the video cassette 10 when the power supply is cut off. Normally, the loading mechanism in the tape deck section 23 for loading and ejecting the video cassette 10 is operated by the same power source as other circuit blocks, and therefore the video cassette 10 is not ejected when the power supply is cut off. Can not.

By the way, the above memory control section 4a
In the control by, when the power supply is cut off during the write access to the IC memory 10b, I
The latest data requested to be written to the C memory 10b is lost. In order to prevent such loss of the latest data, the latest data requested to be written (hereinafter referred to as the latest recorded data) is I
Before writing to the C memory 10b, it may be recorded in the backup memory 6 or the management information memory 7.

The process of recording the latest recording data in the backup memory 6 will be described below. Figure 4
FIG. 6 is a diagram schematically showing a data flow when a write event occurs in the IC memory 10b in this case. Note that in FIG. 4, the memory R / W 23a is the same as in FIG.
Is omitted.

When a write event is generated by an operation input from the input section 5 (step S401), the memory control section 4a first transfers the predetermined data corresponding to the write event to the backup memory 6 and records the latest data. It is registered as data (step S402). Next, the registered latest recording data is read, transferred to the IC memory 10b and written (step S403). Further, the record data of the IC memory 10b is read and copied to the backup memory 6 (step S404).

From the start of the process of step S401 to the normal termination of the copying process of step S404, the memory control section 4a writes data to the IC memory 10b for reading new data. Control not to access. Further, the memory control unit 4a records the management information for managing the recording state of each recording medium in the management information memory 7 at any time during the above processing.

Next, the transition of each recording state of the IC memory 10b and the backup memory 6 when the latest recording data is recorded in the backup memory 6 will be specifically described. First, FIG. 5 is a diagram showing the transition of the recording state when a write access to the IC memory 10b occurs.

FIG. 5 schematically shows the recording state of the IC memory 10b and the backup memory 6 and the registration state of the latest recording data. Here, the shaded portion in the drawing indicates that the data is being accessed for writing or being deleted. Moreover, in FIG. 5, these states and FIG.
The correspondence with the state transitions (states S301 to S306) shown in (4) is shown for reference, and the changes in the flag information F1 and F2 recorded as management information during this period are also shown. Here, the flag information F1 is stored in the IC memory 10
It is assumed that it is turned off during the write access to b, and the flag information F2 is turned off during the write access to the backup memory 6.

In FIG. 5, before the timing T501, the IC memory 10b is in the accessible state (state S301 in FIG. 3), and the memory control unit 4
a is in a standby state for a request for write access and read access to the IC memory 10b according to an input from the input unit 5. In this state, flag information F1
Both F and F2 are in the ON state, the IC memory 10b and the backup memory 6 are both in the normal recording state, and the latest recording data is not registered.

At timing T501, when a write access to the IC memory 10b occurs, the memory control section 4a detects this and registers the data corresponding to the input in the backup memory 6 as the latest recording data.

At timing T502, when the registration of the latest recorded data is completed, the registered latest recorded data is I
The data is transferred to the C memory 10b and the write access is started (state S302). At this time, the state flag F1 changes to the off state. Further, when the write operation of the latest recorded data to the IC memory 10b is normally completed, the state flag F1 returns to the ON state.

At timing T503, the latest record data registered in the backup memory 6 is deleted. At this time, since the backup memory 6 is accessed, the flag information F2 changes to the off state.

At timing T504, when the operation of deleting the latest recorded data is completed, the recorded data in the IC memory 10b is transferred to the backup memory 6 and the copy process is performed (state S303).

At timing T505, when the copying to the backup memory 6 is completed normally, the data recording process is completed and the IC memory 10b is transferred to the accessible state (state S301). At this time,
The flag information F2 is returned to the ON state.

In the above process, when the power supply is cut off in the accessible state to the IC memory 10b in which both the flag information F1 and F2 are in the ON state, the IC memory 1 remains as it is after the power is restored.
Write and read access to 0b is immediately possible.

When the power supply is cut off in the period from timing T503 to T505, the recording state of the backup memory 6 is in an error state, so that the recording data of the IC memory 10b is stored in the backup memory 6 after the power is restored. After being copied to, the IC memory 10b shifts to an accessible state.

Further, when the power supply is cut off during the period from timing T502 to timing T503, the recording state of the IC memory 10b becomes an error state. At this time, since the latest recording data, which is the last data to be recorded, is registered in the backup memory 6, after the power is restored, the recording data and the latest recording data in the backup memory 6 are used to Processing for restoring the recorded data in the memory 10b is performed. The data restoration process at this time will be specifically described below.

FIG. 6 is a diagram showing the transition of the recording state when the recording data in the IC memory 10b is restored after the power is restored. In FIG. 6, before timing T601, the power supply is cut off (state S304 in FIG. 3). At this time, the flag information F1 is in the off state, and the latest recording data is stored in the backup memory 6. It is registered.

At timing T601, when the power supply is restored, the memory control section 4a determines the recording states of the IC memory 10b and the backup memory 6 (state S305). At this time, the memory control unit 4a refers to the flag information F1 and F2 recorded in the management information memory 7, and detects that the recording state of the IC memory 10b is the error state.

At timing T602, the restoration operation of the recording data of the IC memory 10b is started according to the determination result of the recording state (state S306). Memory control unit 4a
Accesses the backup memory 6 to read the recorded data, transfers it to the IC memory 10b, and writes this data.

At timing T603, when the data writing to the IC memory 10b is normally completed, the flag information F1 is changed to the ON state, and whether or not the unrecorded data is registered in the backup memory 6 as the latest recorded data. To detect. At this time, the IC memory 10b is in an accessible state (corresponding to the state S301), but for a new data write / read access request from the input unit 5, it is in a standby state until the subsequent timing T607. To be done.

At timing T604, in response to the detection of registration of the latest recorded data, writing of the latest recorded data into the IC memory 10b is started. As a result, the record data associated with the write event that occurred immediately before the power-off is restored on the IC memory 10b. At this time, the write access to the IC memory 10b is in progress (corresponding to the state S302), and the flag information F1 is returned to the off state.

At timing T605, when the write operation of the latest recording data is completed normally, the process of deleting the latest recording data from the backup memory 6 is started. At this time, the flag information F1 is turned on and the flag information F2 is turned off.

At the timing T606, when the latest record data is normally deleted, the process of copying the record data of the IC memory 10b to the backup memory 6 is started (corresponding to the state S303). As a result, the recording data of the IC memory 10b including the latest recording data whose recording operation is incomplete due to the power-off is backed up in the backup memory 6.

At timing T607, when the data copying operation to the backup memory 6 is completed normally, the series of processes following the power restoration is completed, the flag information F2 is turned on, and the IC memory 10b becomes accessible. It returns (state S301).

As described above, when a write event to the IC memory 10b occurs, the latest record data associated therewith is registered in the backup memory 6 and then the IC memory 10b is registered.
By writing to b, it becomes possible to restore all the data that should have been recorded up to immediately before disconnection to the IC memory 10b when the operation of the IC memory 10b is restored after the power is disconnected. Therefore, the user can use the digital video camera 1 with peace of mind without fear of loss of recorded information due to unintentional power-off such as detachment of the removable battery 8a.

In the above embodiment, the apparatus for recording the moving image data and the audio data on the magnetic tape has been described, but the present invention is not limited to this. For example, still image data or any other data is recorded. The present invention can be applied to a device that does. Also,
In addition to the above cassette type magnetic tape, for example, an external recording medium having a secondary recording medium such as an FD (flexible disk) having a semiconductor memory mounted in a part of a storage case is connected to each recording medium. The present invention can be applied to an apparatus capable of recording data by using the above method.

[0079]

As described above, in the data recording apparatus of the present invention, new data for the secondary recording medium is completely updated until the backup operation for the recording data of the secondary recording medium to the built-in recording medium is completely completed. Since recording is not executed,
Even when the power supply is suddenly cut off, the normal recording state is maintained in at least one of the secondary recording medium and the built-in recording medium, and the previously recorded data is guaranteed.

Further, when the power supply to the entire apparatus is cut off in the state where the recording operation on the secondary recording medium is incomplete, the recording data of the built-in recording medium is transferred to the secondary recording medium when the power supply is restarted. On the contrary, if the power supply is cut off while the backup operation to the built-in recording medium is incomplete, the backup operation to the recorded data of the secondary recording medium should be executed again when the power supply is restarted. May be. Accordingly, when the power supply is cut off during the data recording operation, the loss of the recording data on the secondary recording medium can be suppressed to the minimum when the operation is restored thereafter.

Further, in the data recording method of the present invention, new data recording on the secondary recording medium is not executed until the backup operation for the recording data on the secondary recording medium to the internal recording medium is completely completed. Even when the power supply is suddenly cut off, the normal recording state is maintained in at least one of the secondary recording medium and the built-in recording medium, and the previously recorded data is guaranteed.

When the power supply is cut off in the state where the recording operation on the secondary recording medium is incomplete, the recording data of the built-in recording medium is copied to the secondary recording medium when the power supply is restarted. On the contrary, when the power supply is cut off while the backup operation for the built-in recording medium is incomplete, the backup operation for the record data of the secondary recording medium may be executed again when the power supply is restarted. . Accordingly, when the power supply is cut off during the data recording operation, it is possible to minimize the loss of the recording data on the secondary recording medium when the operation is restored thereafter.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration example of a digital video camera that is an embodiment of the present invention.

FIG. 2 is a state transition diagram showing a transition of basic control states of an IC memory and a backup memory by a memory control unit.

FIG. 3 is a state transition diagram showing a transition of basic control states of an IC memory and a backup memory by a memory control unit.

FIG. 4 is a diagram schematically showing a data flow when a write event occurs in an IC memory when the latest recorded data is recorded in a backup memory.

FIG. 5 is a diagram showing a transition of a recording state when a write access to an IC memory occurs when the latest recording data is recorded in a backup memory.

FIG. 6 is a diagram showing a transition of a recording state when the recorded data in the IC memory is restored after the power is restored, when the latest recorded data is recorded in the backup memory.

[Explanation of symbols]

1 ... Digital video camera, 2 ... Video recording / playback section, 3 ... Display section, 4 ... Control microcomputer, 4a ... Memory control section, 5 ... Input section, 6 ... Backup memory, 7 ... Management information memory, 8a ... Removable battery,
8b ... auxiliary battery, 10 ... video cassette, 10
a ... magnetic tape, 10b ... IC memory, 21 ... imaging block, 22 ... video encoder, 23 ... tape deck section, 23a ... memory R / W, 24 ... video decoder

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Claims (13)

[Claims] 1. A data recording apparatus for recording data on an external recording medium and a secondary recording medium associated with the external recording medium, comprising a built-in recording medium for backing up recorded data of the secondary recording medium, Every time a recording operation is performed on the secondary recording medium, a backup operation is performed on the built-in recording medium, and new data recording on the secondary recording medium is not performed until the backup operation is completely completed. A data recording device characterized by. 2. When the power supply to the entire apparatus is cut off in a state where the recording operation to the secondary recording medium is incomplete, the recording data of the built-in recording medium is rewritten when the power supply is restarted. When the power is cut off by copying to a secondary recording medium and the backup operation for the built-in recording medium is incomplete, the data recorded on the secondary recording medium is rewritten when the power supply is restarted. The data recording apparatus according to claim 1, wherein the backup operation is executed again. 3. A latest recording data holding unit for holding new data to be recorded prior to the recording operation on the secondary recording medium, wherein the recording operation on the secondary recording medium is incomplete. When the power supply is cut off, when the power supply is restarted, the recording data of the built-in recording medium is copied to the secondary recording medium, and then the holding data of the latest recording data holding means is set to the secondary recording medium. The data recording device according to claim 2, wherein the data is recorded in the data recording medium. 4. A state information holding unit that holds state information indicating a state of a recording operation with respect to the secondary recording medium and a state of the backup operation with respect to the built-in recording medium, and is operated by an independent auxiliary power source. 3. The data recording apparatus according to claim 2, wherein the recording state of the secondary recording medium and the built-in recording medium is determined by referring to the state information when the power supply is restarted. 5. The data recording apparatus according to claim 1, wherein the external recording medium is not permitted to be removed when the power supply is cut off. 6. The data recording storage according to claim 1, wherein the secondary recording medium and the built-in recording medium are both nonvolatile semiconductor memories. 7. The data recording device according to claim 1, wherein the external recording medium is a magnetic tape. 8. The secondary recording medium is recorded with recording date / time information regarding recording data of the external recording medium and recording position information of corresponding data in the external recording medium. The data recording device according to claim 7. 9. An image recording apparatus capable of recording image data on an external recording medium and recording arbitrary data on a secondary recording medium attached to the external recording medium, the secondary recording medium A built-in recording medium for backing up the recording data of (1), the backup operation for the built-in recording medium is executed every time the recording operation for the secondary recording medium is performed, and the backup operation is completed. Up to, no new data recording is performed on the secondary recording medium. 10. When the power supply to the entire apparatus is cut off in a state where the recording operation on the secondary recording medium is incomplete, when the power supply is restarted, the recording data of the built-in recording medium is recorded. When the power is cut off by copying to a secondary recording medium and the backup operation for the built-in recording medium is incomplete, the data recorded on the secondary recording medium is rewritten when the power supply is restarted. The image recording apparatus according to claim 9, wherein the backup operation is executed again. 11. The image recording apparatus according to claim 9, further comprising: an image capturing unit configured to capture an image, and an image data generating unit configured to generate the image data based on the captured image. 12. A data recording method for recording data on an external recording medium and a secondary recording medium associated with the external recording medium, wherein each time a recording operation is performed on the secondary recording medium,
Data that is used to perform a backup operation of the recording data of the secondary recording medium to the built-in recording medium and not to perform new data recording to the secondary recording medium until the backup operation is completely completed. Recording method. 13. When the power supply is cut off in a state where the recording operation to the secondary recording medium is incomplete, the recording data of the built-in recording medium is changed to the secondary recording medium when the power supply is restarted. When the power supply is cut off while the backup operation for the built-in recording medium is incomplete, the backup operation for the record data of the secondary recording medium is restarted when the power supply is restarted. The data recording method according to claim 12, wherein the data recording method is executed again.