JPH08287593A - Device and method for recording av data - Google Patents

Abstract

PURPOSE: To provide the AV data recorder with which even any unexpected case or the like can be suitably recorded without being missed. CONSTITUTION: When a STANBY state is provided, first of all, input AV data AVIN are recorded in a repeated recording/reproducing part 120 as updatable AV data. Next, when a REC state is provided, the input AV data AVIN are recorded in the repeated recording/reproducing part 120 as formal preserved AV data. When that REC state is provided, the data up to certain time from the recording start time of those preserved AV data just for prescribed time in the updatable AV data continuously recorded before those preserved AV data are decided as valid AV data by a valid data deciding part 113. The managing data of a managing part 112 are updated so that those valid AV data and the formal preserved AV data can become series of recorded data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AV data recording device capable of properly recording a sudden event.

[0002]

2. Description of the Related Art As an apparatus for recording or reproducing AV data including either or both of audio data and video data, a video tape recorder (VTR) apparatus is widely used. In the VTR device, although only sequential access is possible, long-term AV data can be inexpensively recorded on the tape recording medium. Since the recording density of randomly accessible recording media such as hard magnetic disk media (HDD) and magneto-optical disk media (MOD) has been significantly improved, an apparatus for recording AV data on these recording media has also been realized in recent years. ing.
Such a device is particularly effectively used in an AV editing device that requires random access of AV data, a video on demand (VOD) system, and the like. further,
With the high integration of semiconductor circuits, large-capacity memory chips have been provided, and it is possible to configure a recording unit for recording AV data with these large-capacity memory chips. In particular, if AV data compressed at a high rate is used, AV data of a considerable time can be recorded.

[0003]

However, such a V
Conventional AV data recording devices such as TR devices have a problem that it is not possible to appropriately record a sudden event that is not clearly known when it will occur. In order to record such an event, it is not enough to operate the VTR device after the event has occurred. Therefore, it is necessary to operate the VTR device in advance before the event occurs. However, such recording causes a problem that a large amount of useless data is generated. Furthermore, after the event actually occurred, there was a problem that the remaining amount of the recordable tape was small and the time required to record a required image was short.

Therefore, an object of the present invention is to record AV data so that even for a sudden event whose occurrence time is not clearly known, AV data can be appropriately recorded from a predetermined time before the occurrence of the event. To provide a device.

[0005]

In order to solve the above-mentioned problems, apart from AV data that is officially saved as reproducible recorded data, it is treated as reproducible saved data only when needed, and when not needed. In this case, auxiliary data that can be updated with new data is recorded. Then, as this auxiliary data, the data preceding the occurrence of the event is recorded, and if any event occurs later and becomes necessary, the auxiliary data is officially made valid data. .

Therefore, the AV data recording apparatus of the present invention is an AV data recording apparatus for recording AV data containing either or both of audio data and video data, and continuously records input AV data. A possible recording medium, and the AV data input with the first control signal is recorded on the recording medium as updatable AV data, and the AV data input with the second control signal is saved AV. Recording means for recording as data on the recording medium and saving of the updatable AV data continuously recorded prior to the saved AV data from a time before a recording start time of the saved AV data by a predetermined time. Valid AV data determining means for determining data up to the recording start time of AV data as valid AV data; A valid AV data, the effective A
The data management means manages the V data and the continuous AV data stored as a series of recorded AV data.

[0007] Preferably, the valid AV data determining means has a shorter one of a predetermined time and a recording time of updatable AV data continuously recorded prior to the stored AV data. The updatable AV data from the time before the recording start time of the stored AV data to the recording start time of the stored AV data by the other time is determined as valid AV data.

Further preferably, the AV data recording apparatus of the present invention comprises recording instruction means for instructing to start recording AV data, and standby instruction means for instructing to wait for the instruction to start recording. Further comprising, the first control signal is
The second control signal is generated based on the standby instruction from the standby instruction unit, and the second control signal is generated based on the recording instruction from the recording instruction unit.

In addition, the AV data recording method of the present invention is such that audio data and video data are recorded in a recording device having a recording medium capable of continuously and repeatedly recording and a control means for recording / reproducing data on / from the recording medium. A method for recording AV data containing either or both of the above, wherein AV data input with the first control signal is recorded as updatable AV data on the recording medium, and with the second control signal. The AV data input as the storage AV data is recorded in the recording medium as the storage AV data, and the recorded storage AV is recorded.
Data of the updatable AV data continuously recorded prior to the data from the time before the recording start time of the stored AV data to the recording start time of the stored AV data is valid. The AV data is determined as AV data, and the determined valid AV data and the stored AV data that is continuous with the valid AV data are managed as a series of recorded AV data.

[0010]

In the AV data recording apparatus of the present invention, in the recording means, the AV data input with the first control signal is recorded on the recording medium as updatable AV data, and with the second control signal. The input AV data is recorded on the recording medium as saved AV data. And
When the stored AV data is recorded, the valid AV data determination means determines a predetermined time from the recording start time of the stored AV data of the updatable AV data continuously recorded prior to the stored AV data. The data up to the time when the time goes up is determined as valid AV data. The determined valid AV data and the recorded saved AV data are managed as a series of recorded data.

Further, in the AV data recording method of the present invention, the AV data input with the first control signal is recorded on the recording medium as updatable AV data, and the AV data is input with the second control signal. Save AV data AV
The data is recorded on the recording medium. When the saved AV data is recorded, the saved AV of the updatable AV data continuously recorded before the saved AV data is recorded.
The AV data from the time when the recording of the data is started up to a time that is a predetermined time upward is determined as valid AV data. Then, the determined valid AV data and the saved AV
The data and are managed as a series of recorded data.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An AV data recording apparatus according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing the configuration of an AV data recording apparatus according to an embodiment of the present invention. The AV data recording apparatus of this embodiment is a VT that records various incidents / events input from a television camera.
R device. The AV data recording device 100 includes a control unit 1
10 and a repeat recording / reproducing unit 120. The control unit 110 also includes a control unit 111, a management unit 112, and a valid data determination unit 113.

First, the structure of each part will be described. The control unit 111 of the control unit 110 controls the internal control signal CT based on the control signal CTL1 input from the outside.
L2 is generated and the operation of the entire repetitive recording / reproducing unit 120 and the AV data recording device 100 is controlled. A control signal as shown in Table 1 is input as the control signal CTL1 input from the outside. The external control signal CTL1 shown in Table 1
Occurs when the operator presses a button corresponding to each control signal provided outside the AV data recording apparatus 100, and is input to the control unit 110.

[0014]

[Table 1]

As the control signal CTL2 for controlling the repetitive recording / reproducing section 120, the control signals shown in Table 2 are output.

[0016]

[Table 2]

The operation of the control section 111 according to each control signal CTL1 will be described below. Leading recording time setting signal SETA
When DTIME (SET ADVanced TIME) is input, the time Tb, which is input at the same time for reverse recording, is recorded in the management unit 112.

When the preceding recording start signal STANBY is input,
A recording start signal REC is output to the repetitive recording / reproducing unit 120, and a signal indicating that the recorded data is updatable data is output to the management unit 112. In recording data based on the preceding recording start signal STANBY, the control unit 111 appropriately updates the updatable data already recorded in the repetitive recording / reproducing unit 120, that is, overwrites the old updatable data. The new data is recorded in the state of being.

When the main recording start signal REC is input, the recording start signal REC is repeatedly output to the recording / reproducing unit 120, and a signal indicating that the data to be recorded is stored data is output to the management unit 112.

At this time, by the preceding recording start signal STANBY,
When the recording of the data as the updatable data has already been performed by the repetitive recording / reproducing unit 120, the control unit 111 performs the following processing. First, the recording start signal REC is not output to the repetitive recording / reproducing unit 120, but only a signal indicating that the data to be recorded is stored data is output to the management unit 112. Next, a signal is output to the valid data determination unit 113 to determine how much of the updatable data recorded so far is valid data, that is, data to be officially stored. Then, based on the result, the management data recorded in the management unit 112 is updated so that the valid data and the data recorded after the main recording start signal REC is input become a series of recorded AV data. .

A reproduction start signal PLAY is sent to the control section 111.
Is input, the control unit 111 causes the management unit 112 to
The area where a series of AV data is recorded is obtained by referring to the management data recorded on the recording medium, and the recording / reproducing unit 120 is repeatedly used to reproduce the recorded AV data.
The playback start signal PLAY is output to.

When the recording / playback end signal STOP is input,
The recording / reproducing end signal STOP is repeatedly output to the recording / reproducing unit 120 so as to end the processing regardless of the operation of the recording or the reproducing.

The management unit 112 includes a repetitive recording / reproducing unit 12
Management data of data recorded in 0 and AV
The parameters related to the configuration of the data recording device 100 are recorded. In the parameter, the time T for reverse recording set by the preceding recording time setting signal SETADTIME is set.
It also includes data such as b. Those data recorded in the management unit 112 are accessed by the control unit 111, and the control unit 111 and the valid data determination unit 1
It is used in 13 and so on. As the management data, in addition to general file management data such as the file name of the data file, the recording area, and the recording size, it is possible to update the data such as updatable data, valid data, or formal saved data. Data that distinguishes data is also recorded.

The valid data determination unit 113 is provided in the control unit 110.
The range of valid AV data in the updatable AV data recorded in the repetitive recording / reproducing unit 120 is determined based on the signal input from the control unit 111 when the main recording start signal REC is input. . In the valid data determination unit 113, the time Tb for reverse recording set in the management unit 112 by the preceding recording time setting signal SETADTIME and the updatable value calculated by the management data also recorded in the management unit 112 can be updated. AV data recording time T
c is compared, and the shorter time Td is extracted.
Then, the time when the actual recording start signal REC is input to the control unit 110 is raised by the time Td from the valid AV time.
Calculate as the data start time.

The repetitive recording / reproducing unit 120 is a randomly accessible recording medium, and is a normal hard magnetic disk device in this embodiment. In the repetitive recording / reproducing unit 120, the control unit 110 manages recorded data as in a normal file system, but the updatable data is processed differently from a formal data file. Is done. That is, the updatable data is provisional data that is unclear as to whether or not it is really needed, so it can be erased or updated as appropriate according to the constraints of the recording area. Specifically, when the repetitive recording / reproducing unit 120 records data based on the preceding recording start signal STANBY, when the recording area becomes full, the rewritable data that has already been recorded is overwritten and a new data is newly written. Data is recorded.

The structure of the repetitive recording / reproducing unit 120 will be further described with reference to FIG. FIG. 2 is a block diagram showing the configuration of the repetitive recording / reproducing unit 120.
(A) is a figure which shows the structure notionally, (B) is a figure which shows the structure. As shown in FIG. 2A, the repetitive recording / reproducing unit 120 can be considered to be configured by a FIFO (first in first out) recording unit 200 (hereinafter referred to as a FIFO) and a selector 201. When a recording command is issued to the FIFO 200 by the control signal CTL2, the input AV data is recorded in the FIFO 200. When new data is sequentially recorded, old data is moved to the right side of the FIFO 200, and data reaching the right end is discarded as it is. When the recording stop command is input to the FIFO 200 by the control signal CTL2, the recording is stopped and the movement of the data in the FIFO 200 is stopped. Any specified data in the FIFO 200 is selected by the selector 201 by the reproduction command and sequentially output.

The actual structure of the repetitive recording / reproducing unit 120 is as shown in FIG.
And an address generator 203 for recording and reproduction,
This is a configuration having 204. AV data storage unit 202
Is a recording means that can be randomly accessed by an address assigned to each word. Recording address generator 203 and reproducing address generator 204
Is an address generator that generates an address on the AV data storage unit 202 that records input data and reproduces output data. Both the recording address generator 203 and the reproducing address generator 204 have a head address next to the last address.
Recording is sequentially and repeatedly performed on the V data storage unit 202.

Next, the operation of the AV data recording apparatus 100 will be described with reference to FIGS. 3 and 4. FIG. 3 shows A
5A and 5B are diagrams showing a first example for explaining the operation of the V data recording apparatus 100, wherein FIG. 9A is a diagram showing recording data at the start of preceding recording, and FIG.
(C) is a diagram showing recording data at the end of recording, and (D) is T
The figure which shows the playback data in the case of b <= Tc, (E) is Tb>
It is a figure which shows the reproduction data in case of Tc.

4A and 4B are diagrams showing a second example for explaining the operation of the AV data recording apparatus 100. FIG. 4A is a diagram showing recording data at the start of preceding recording, and FIG. Recording data, recording data at the end of recording, (D) normal reproduction data, and (E)
FIG. 6 is a diagram showing reproduction data when the recording area is full. 3 and 4, Ta represents the capacity of the recording area of the repetitive recording / reproducing unit 120, Tb represents the time of preceding data recording, and Tc represents the time of actual preceding recording of data. .

First, when the preceding recording start signal STANBY is input to the control unit 110 at the time t0 shown in FIGS. 3A and 4A, the control unit 110 causes the repeated recording / reproducing unit 12 to operate.
A recording start signal REC for starting recording is output to 0. As a result, the repetitive recording / reproducing unit 120 starts recording the AV data AV _IN input from the outside. However,
Data recorded thereafter is recorded as updatable data. The recording of the input data as the updatable data is performed by the recording start signal RE shown in FIG. 3 (B) and FIG. 4 (B).
The process continues until time t1 when C is input. Note that FIG.
As shown in (B), when the recording area becomes full, old data is sequentially overwritten, that is, old data is erased and new data is recorded. Therefore, in such a case, the data for the latest time Ta is always recorded on the recording medium.

Time t1 when an arbitrary time has elapsed from time t0
When the recording start signal REC is input to the control unit 110,
The input AV data AV _IN is continuously recorded, but the data to be recorded thereafter is recorded as official saved data. At this time, the valid data determination unit 113
At, the start point of valid recording data in the updatable AV data already recorded is determined.

Even when the recording area becomes full at the time of recording the formal storage data, the recording is performed before the start point determined as the valid recording data as shown in FIGS. 4C and 4D. The updatable data that have been created are sequentially erased, and the official saved data is recorded. However, as shown in FIG. 4 (E), when the rewritable data recorded before the start point, which is determined to be the valid record data, is erased and the recording area is still full, that is, the valid record data is valid. If the recording area becomes full due to data or saved data,
No new data is recorded. In this way, the recording data near the time when the recording start signal REC is input is preferentially stored.

Time t shown in FIGS. 3C and 4C.
2, when the recording / reproduction end signal STOP is input to the control unit 110, the control unit 110 repeats the recording / reproduction unit 120.
A recording / reproduction end signal STOP is outputted to the recording end of the AV data AV _IN input from the outside.

Then, when a reproduction start signal PLAY requesting reproduction of recorded AV data is input to the control unit 110 at an arbitrary time t3, the control unit 110 causes the control unit 110 to change to the time t.
The reproduction start signal PLAY is repeatedly output to the recording / reproducing unit 120 so that the reproduction is started from the start point of the effective recording data determined when the recording start signal REC of 1 is input to the control unit 110.

That is, as shown in FIGS. 3D and 4D, the time Tb for reverse recording and the time T recorded in the recording / reproducing unit 120 as updatable data.
If c is compared and the time Tb for reverse recording is smaller than the time Tc at which updatable data is recorded, reproduction is performed with the time Tb backward as the starting point of the recorded data. Further, as shown in FIG. 3 (E), if the recorded time Tc is shorter than the time Tb for recording in reverse, all the data from the beginning of the updatable data is reproduced as the recorded data. I do. Also, FIG. 4 (E)
Even when the recording area is full and recording is stopped as shown in FIG. 5, data from the time when the recording start signal REC is input and the time Tb backward is appropriately reproduced. The reproduced AV data is the external output AV data AV _OUT
Is output as

As described above, the AV data recording apparatus 100 can record the AV data from the time when the recording start signal is input from the outside and the time when the AV data recording apparatus 100 goes up by a predetermined time. Therefore, when you want to record an event that you do not know when it will occur, such as when you are interviewing, leave the preceding recording start state in the waiting state,
If the recording start operation is performed at the time when the target event occurs, the data from a predetermined time before the event occurs is recorded, and the target event can be properly recorded without excess or deficiency.

The AV data recording apparatus of the present invention is not limited to this embodiment, and various modifications can be made. For example, in the present embodiment, the control unit 110 includes a control unit 111 and a management unit 11 as shown in FIG.
2 and the configuration including the valid data determination unit 113 is provided, but the configuration is not limited to this. It is also possible to combine all of these components and use a circuit such as a general-purpose arithmetic control unit. The block diagram is shown in FIG. The control unit 110 includes the CPU 401 and the ROM shown in FIG.
402, RAM 403, and control signal I / F 404
May be realized by a general-purpose arithmetic control unit such that each is connected via a bus 405.

Further, the repetitive recording / reproducing unit 120 is a hard magnetic disk in the present embodiment, and is constituted by a hard disk shown in FIG.
Although the configuration as shown in (1) is adopted, the present invention is not limited to this. It can also be configured by using a circuit such as a general-purpose arithmetic and control unit. The block diagram is shown in FIG.
It shows in (A). In FIG. 6A, the CPU 301, R
The recording / reproducing address is generated by the OM 302 and the RAM 303. Then, using that address, the SCS
The hard magnetic disk medium (HDD) 308 is accessed via the I interface 307. Control signal I / F
The 304 controls the transmission of control signals with the control unit, and the IO interface 305 controls the data transfer.

The AV data storage section of the repetitive recording / reproducing section 120 is not limited to the hard magnetic disk, and any recording means may be used as long as it is a randomly accessible recording means. For example, a magneto-optical disk medium (MOD) or semiconductor memory (RAM) may be used. FIG. 6 shows the configuration of the repetitive recording / reproducing unit 120 when the HDD or RAM is used as a recording medium for AV data.
It shows in (B) and FIG. 6 (C).

As shown in FIG. 6B, AV data recording
When using MOD as a medium, when using HDD
Repeated recording / reproducing unit 120 can be configured with the same configuration.
It In addition, as shown in FIG. 6C, the AV data recording medium
When RAM is used as the body, the interface unit 3
Although 07 is unnecessary, HDD is basically used.
The recording / reproducing unit 120 can be repeatedly configured with the same configuration as the above.
It Note that in FIG. 6C, the RAM_-1303 is CP
RAM for the operation of U301. _-2306
Is a RAM for accumulating AV data.

Further, in this embodiment, as shown in FIG. 4E, even if the updatable data recorded before the start point, which is determined to be valid recording data, is erased, the recording area is still full. In that case, no new data was recorded. However, when the emphasis is placed on recording the latest data, old data may be discarded and new data may be recorded. Further, the external control signal CTL1 shown in each embodiment, and the types of the control signals CTL2 to CTL4 from the control unit to each component, the corresponding operations, etc. are not limited to the present embodiment, and any type of arbitrary Control signals may be used.

[0042]

According to the AV data recording apparatus of the present invention, by instructing the start of recording, the AV data recorded backward from the time point by a predetermined time is recorded. Can be recorded in. Further, by using the AV data recording method of the present invention, such an AV data recording device can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an AV data recording device according to an embodiment of the present invention.

2A and 2B are diagrams showing a configuration of a repetitive recording / reproducing unit of the AV data recording device shown in FIG. 1, wherein FIG. 2A is a conceptual diagram showing a configuration, and FIG. 2B is a diagram showing the configuration.

3A and 3B are diagrams showing a first example for explaining the operation of the AV data recording apparatus shown in FIG. 1, where FIG. 3A is a diagram showing recorded data at the start of preceding recording, and FIG. A diagram showing recorded data at the start of recording, (C) a diagram showing recorded data at the end of recording, (D) a diagram showing reproduced data when Tb ≦ Tc, (E) a diagram showing reproduced data when Tb> Tc It is a figure which shows reproduction data.

4A and 4B are diagrams showing a second example for explaining the operation of the AV data recording device shown in FIG. 1, where FIG. 4A is a diagram showing recorded data at the start of preceding recording, and FIG. A diagram showing recorded data at the start of recording, (C) a diagram showing recorded data at the end of recording, (D) a diagram showing normal reproduced data, (E)
FIG. 6 is a diagram showing reproduction data when the recording area is full.

5 is a block diagram showing a control unit of the AV data recording device shown in FIG.
It is a figure which shows the structure at the time of forming with a general purpose arithmetic and control unit.

FIG. 6 is a diagram showing a configuration when a repetitive recording / reproducing unit of the AV data recording device shown in FIG. 1 is formed by a general-purpose arithmetic control unit, and FIG. 6A shows a hard magnetic disk as an AV data recording medium. Configuration diagram when used, (B) AV
FIG. 3 is a configuration diagram when a magneto-optical disk is used as a data recording medium, and FIG. 6C is a configuration diagram when a semiconductor memory is used as an AV data recording medium.

[Explanation of symbols]

100 ... AV data recording device 110 ... Control part 111 ... Control part 112 ... Management part 113 ... Effective data determination part 401 ... CPU 402 ... ROM 403 ... RAM 404 ... Control signal I /
F 405 ... Bus 120 ... Repeated recording / reproducing unit 200 ... FIFO 201 ... Selector 202 ... AV data storage unit 203 ... Address generator 204 ... Address generator 301 ... CPU 302 ... ROM 303 ... RAM 304 ... Control signal I /
F 305 ... Input / output I / F 306 ... AV data recording RAM 307 ... SCSII / F 308 ... Hard magnetic disk 309 ... Magneto-optical disk

Claims (4)

[Claims] 1. An AV data recording device for recording AV data containing either or both of audio data and video data, comprising: a recording medium capable of continuously and repeatedly recording input AV data; Recording in which the AV data input with a control signal is recorded in the recording medium as updatable AV data, and the AV data input with a second control signal is recorded in the recording medium as storage AV data Means and a period from a time before a recording start time of the stored AV data to a recording start time of the stored AV data of the updatable AV data continuously recorded prior to the stored AV data. Valid AV data deciding means for deciding this data as valid AV data, the decided valid AV data, and the valid AV data And an AV data recording device having a data managing unit for managing the above-mentioned stored AV data as a series of recorded AV data. 2. The valid AV data determining means determines which of a shorter predetermined time and a recording time of updatable AV data continuously recorded prior to the stored AV data. The AV data recording apparatus according to claim 1, wherein the updatable AV data from a time before a recording start time of the stored AV data to a recording start time of the stored AV data by time is determined as valid AV data. 3. A recording instructing means for instructing the start of recording AV data, and a standby instructing means for instructing to wait for the instruction to start the recording, wherein the first control signal is The AV data recording apparatus according to claim 1, wherein the AV data recording device is generated based on the standby instruction from the standby instruction unit, and the second control signal is generated based on the recording instruction from the recording instruction unit. 4. A recording medium capable of continuously and repeatedly recording,
A method of recording AV data containing audio data and / or video data in a recording device having a control means for recording / reproducing data on / from the recording medium, the method comprising recording a first control signal. The inputted AV data is recorded on the recording medium as updatable AV data, the AV data inputted along with the second control signal is recorded on the recording medium as saved AV data, and the recorded saved AV data is recorded. Of the updatable AV data continuously recorded prior to the recording start time of the stored AV data from a predetermined time before the recording start time of the stored AV data to valid AV data. The valid AV data determined as data and the saved AV data continuous with the valid AV data are recorded as a series of recorded AV data. AV data recording method managed as a.