KR102614013B1 - Video recorder - Google Patents

Abstract

The video recorder of this embodiment includes a control unit, hard disk drives, an auxiliary power unit, and a supply power detection unit. The auxiliary power supply unit is charged by the power supplied to the video recorder. The supply power detection unit measures the voltage of the supply power and generates a power cutoff signal when the voltage of the supply power disappears. When a power cut-off signal is generated from the power supply detection unit, the control unit operates by the power of the auxiliary power unit and prevents additional write operations from being performed after the write operation is completed for the sector that is the target of the write operation currently in progress in each of the hard disk drives. Control.

Description

Video recorder {Video recorder}

The present invention relates to a video recorder, and more specifically, to a video recorder having a control unit and recording media, and recording video data of each channel on the recording media by the control unit, for example, a digital video recorder (DVR). Or about a network video recorder (NVR).

A video recorder, such as a digital video recorder (DVR) or a network video recorder (NVR), is equipped with a control unit and recording media, and records video data of each channel on the recording media by the control unit. . As is well known, a hard disk drive or SSD (Solid State Drive, hereinafter referred to as SSD) is used as a recording medium in a video recorder.

In a recording medium, if the power supply is cut off while a recording operation is being performed on a sector, the sector becomes a logical bad sector. For example, if ECC (Error Correction Code) is not recorded after main data is recorded in a sector, that sector becomes a logical bad sector.

If bad sectors are created in recording media within a video recorder, the video data to be recorded and the file system may be damaged. Nevertheless, it may frequently occur that the power supply to the video recorder is cut off.

In preparation for this, power can be supplied to the video recorder through an expensive UPS (Uninterruptible Power Supply). However, examples of power supply being cut off include not only a power outage, but also a user's intentional on/off operation, a defective power cable, and disconnection of the power cable due to the user's carelessness. That is, power cut-off due to the user intentionally turning the power switch of the video recorder off/on, power cut-off due to a defective power cable entering the video recorder, and disconnection of the power cable due to the user's carelessness. etc. have a negative effect on the recording media in the video recorder even if an expensive UPS is used.

Accordingly, when the power supply to the video recorder is cut off, the system can be terminated using the battery charged by the supplied power. However, since head parking operation (in the case of a hard disk drive) or standby operation (in the case of an SSD) is performed after all video data in the cache memory of the recording medium is recorded, the system is shut down. It takes a relatively long time to do so. That is, if an expensive, large-capacity battery is not used, bad sectors may be created in recording media.

The problem with the above background technology is that it is information that the inventor possessed for deriving the present invention or learned in the process of deriving the present invention, and cannot necessarily be said to be known to the general public before filing the application for the present invention.

Republic of Korea Patent Publication No. 2010-0124980 (Applicant: Mtech Vision Co., Ltd., Name: Image storage device and image storage method)

An embodiment of the present invention seeks to provide a video recorder in which bad sectors may not be generated in recording media even without using an expensive UPS or an expensive large-capacity battery.

The video recorder of the embodiment of the present invention includes a control unit and recording media, and records video data of each channel on the recording media by the control unit. This video recorder includes an auxiliary power section and a supply power detection section.

The auxiliary power supply unit is charged by power supplied to the video recorder.

The supply power detection unit measures the voltage of the supply power, and generates a power cutoff signal when the voltage of the supply power disappears.

When the power cut-off signal is generated from the power supply detection unit, the control unit operates by power from the auxiliary power unit and performs an additional recording operation after the recording operation is completed for the sector that is the target of the recording operation currently in progress in each of the recording media. Control so that this is not performed.

According to the video recorder of this embodiment, when the supply power is cut off, it operates so that no additional recording operation is performed. Accordingly, the head parking operation can be completed in a relatively short period of time after the supply power is cut off. Therefore, even if an expensive UPS or an expensive large capacity battery is not used, bad sectors may not be created in the recording media. For example, even if a capacitor or a low-cost, small-capacity battery is used as the auxiliary power supply, bad sectors may not be created in the recording media.

Figure 1 is a diagram showing a surveillance system using a digital video recorder (DVR) as a video recorder according to the first embodiment of the present invention.
FIG. 2 is a block diagram showing the internal configuration of the digital video recorder (DVR) in FIG. 1.
FIG. 3 is a block diagram showing an example of the internal configuration of the hard disk drives in FIG. 2.
Figure 4 is a diagram showing a surveillance system using a Network Video Recorder (NVR) as a video recorder according to a second embodiment of the present invention.
FIG. 5 is a block diagram showing the internal configuration of the network video recorder (NVR) in FIG. 4.
FIG. 6 is a flowchart showing the operation of each hard disk drive in FIG. 2 or FIG. 5.
FIG. 7 is a flowchart showing the operation of the control unit in FIG. 2 or FIG. 5 when the supply power is cut off.

The following description and attached drawings are for understanding the operation according to the present invention, and parts that can be easily implemented by a person skilled in the art may be omitted.

Additionally, the specification and drawings are not provided for the purpose of limiting the present invention, and the scope of the present invention should be determined by the claims. The terms used in this specification should be interpreted with meanings and concepts consistent with the technical idea of the present invention so as to most appropriately express the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. In these embodiments, a hard disk drive is used as the recording medium, but a solid state drive (SSD) may be equally applied instead of the hard disk drive.

Figure 1 shows a surveillance system using a digital video recorder (DVR: 2) as a video recorder according to the first embodiment of the present invention.

Referring to FIG. 1, surveillance cameras 1a, 1b, and 1c communicate with a digital video recorder (DVR, 2) through a communication channel (D _COM ) and provide live-view information through a video signal channel (S _VID ). (Live-view) video signal is transmitted to the digital video recorder (2).

The digital video recorder 2 is equipped with a control unit and hard disk drives (or SSDs), and records video data of each channel on the hard disk drives (or SSDs) by the control unit.

FIG. 2 shows the internal configuration of the digital video recorder (DVR, 2) in FIG. 1.

FIG. 3 shows an example of the internal configuration of the hard disk drives 212 in FIG. 2.

2 and 3, a digital video recorder (DVR, 2) as the first embodiment includes analog-to-digital converters 201 to 203, a multiplexer 204, a video signal generator 205, a control unit 207, User input unit 208, compression unit 209, recovery unit 210, dynamic DRAM (211), hard disk drives 212, power supply unit 213, auxiliary power unit 214, and supply power detection unit. Includes (215).

Each of the analog-to-digital converters 201 to 203 digitally converts video signals input through video signal channels (S _VID1 , S _VID2 , and S _VID3 ) from each of the surveillance cameras (1a, 1b, and 1c in FIG. 1). Convert to video data.

The multiplexer 204 integrates and outputs selected digital image data according to commands from the control unit 207.

The video signal generator 205 converts the composite image data from the multiplexer 204 into an integrated video signal (S _VIDM ), which is an analog image signal, and outputs it. The integrated video signal (S _VIDM ) from the video signal generator 205 is input to the display device.

The control unit 207 communicates with the surveillance cameras (1a, 1b, 1c in FIG. 1) through communication channels (D _COM1 , D _COM2 , and D _COM3 ), and controls the overall operation according to a user command from the user input unit 208. Perform control.

Meanwhile, when a play command is issued through the user input unit 208, the control unit 207 controls the hard disk drives 212, the recovery unit 210, and the dynamic RAM (Dynamic RAM) 211 to restore the hard disk drive. The compressed data recorded in fields 212 is restored and input into the multiplexer 204. Here, the digital image data to be restored is digital image data selected according to a command from the user input unit 208.

Additionally, the multiplexer 204 integrates the digital image data from the restoration unit 210 and outputs it. Accordingly, the video signal generator 205 converts the composite image data from the multiplexer 204 into a integrated video signal (S _VIDM ), which is an analog video signal, and outputs it. The integrated video signal (S _VIDM ) from the video signal generator 605 is input to the display device.

Of course, dynamic DRAM (DRAM) 211 is not only used when the recovery unit 210 operates, but can also be used when the compression unit 209 operates.

The auxiliary power supply unit 214 as a battery or capacitor is charged by power supplied from the power supply unit 213.

The supply power detection unit 215 measures the voltage of the supply power from the power supply unit 213, and generates a power cutoff signal when the voltage of the supply power disappears.

When a power cut-off signal is generated in the power supply detection unit 215, the control unit 207 operates by the power of the auxiliary power unit 214 and detects the sector that is the target of the write operation currently in progress in each of the hard disk drives 301 to 304. Controls to prevent additional recording operations from being performed after the recording operation is completed. Examples of specific operations of the hard disk drives 212 and the control unit 207 related thereto will be described with reference to FIGS. 6 and 7.

In this way, when the supply power is cut off, additional recording operations are not performed, so the head parking operation or standby operation (in the case of SSD) can be completed in a relatively short period of time after the supply power is cut off. there is. Therefore, even if an expensive UPS or an expensive large capacity battery is not used, bad sectors may not be created in the hard disk drives 212 or SSDs. For example, even if a capacitor or a low-cost, small-capacity battery is used as the auxiliary power supply unit 214, bad sectors may not be created in the hard disk drives 212 or SSDs.

Figure 4 shows a surveillance system using a Network Video Recorder (NVR) 5 as a video recorder according to the second embodiment of the present invention.

In FIG. 4, reference numeral D _IMA denotes video data channels input to the communication network 402 from each of the surveillance cameras 401a to 401n, for example, the Internet, or client computers 403a to 402 from the communication network 402. 403n) Indicates the video data channels output to each.

Reference symbol D _COM indicates communication channels between each of the surveillance cameras 401a to 401n and the communication network 402, or communication channels between the communication network 402 and each of the client computers 403a to 403n.

Reference symbol D _IMAT refers to a composite video-data channel input from the communication network 402 to the network video recorder (NVR, 5) or composite video-data output from the network video recorder (NVR, 5) to the communication network 402. Indicates the channel.

Reference symbol D _COMT indicates a composite communication channel between a network video recorder (NVR) 5 and a communication network 402.

Referring to FIG. 4, a network video recorder (NVR, 5) is connected to surveillance cameras 401a to 401n and client computers 403a to 403n as transmission targets through a communication network 402, for example, the Internet. .

Surveillance cameras 401a to 401n communicate with a network video recorder (NVR, 5) through a communication channel (D _COM ), while transmitting video data of a live-view through a video data channel (D _IMA ). is transmitted to the network video recorder (NVR, 5).

That is, the surveillance cameras 401a to 401n are set for each channel, and periodic packets from each of the surveillance cameras 401a to 401n are transmitted to the network video recorder through the communication network 402, for example, the Internet. It is received at (NVR, 5).

The network video recorder (NVR, 5) transmits and records packets received for each channel while loading them into volatile memory. That is, the network video recorder (NVR, 5) transmits video data loaded for each channel from volatile memory to the client computers (3a, 3b,..., 3n) as transmission targets, and hard disk drives (or SSDs) records).

FIG. 5 shows the internal configuration of the network video recorder (NVR, 5) in FIG. 4.

Referring to FIG. 5, the network video recorder 5 of this embodiment includes a communication interface 501, a control unit 502, random access memory (RAM) 503 as volatile memory, a display interface 504, and a hard disk drive. 505, a power supply unit 513, an auxiliary power supply unit 514, and a power supply detection unit 515. Here, the communication interface 501 performs the function of a network interface card (NIC).

4 and 5, the internal configuration and operation of the network video recorder 5 of this embodiment will be described as follows.

Data of the composite video-data channel (D _IMAT ) and composite communication channel (D _COMT ) input from the surveillance cameras 401a to 401n through the communication network 402 are transmitted to the control unit 502 through the communication interface 501. is entered into

The control unit 502 processes packets input in data reception mode and loads them into RAM 503.

Additionally, the control unit 502 generates and outputs packets in data transmission mode. That is, the control unit 502 transmits video data loaded for each channel from RAM 503 to the client computers 403a to 403n through the communication interface 501.

In the case of this embodiment, the data transmission mode and data reception mode of the network video recorder 5 as described above are performed by layers according to TCP/IP (Transmission Control Protocol/Internet Protocol).

Meanwhile, according to the user's settings, the control unit 502 outputs video data loaded for each channel from RAM 503 to the display interface 504. Accordingly, when the display device is connected to the display interface 504, the video signal (D _DIS ) from the display interface 504 is input to the display device, and the video of the live-view is displayed on the display device. do.

Then, the control unit 502 records video data loaded for each channel from RAM 503 to each of the hard disk drives 505.

The auxiliary power supply unit 514 as a battery or capacitor is charged by power supplied from the power supply unit 513.

The supplied power detector 515 measures the voltage of the supplied power from the power supply unit 513, and generates a power cut-off signal when the voltage of the supplied power disappears.

When a power cut-off signal is generated in the power supply detection unit 515, the control unit 502 operates by the power of the auxiliary power unit 514 and detects the target of the recording operation currently in progress in each of the hard disk drives 505 or SSDs. Controls so that no additional write operation is performed after the write operation is completed for the sector. Examples of specific operations of the hard disk drives 505 and the control unit 502 related thereto will be described with reference to FIGS. 6 and 7.

In this way, when the supply power is cut off, additional recording operations are not performed, so the head parking operation or standby operation (in the case of SSD) can be completed in a relatively short period of time after the supply power is cut off. there is. Therefore, even if an expensive UPS or an expensive large capacity battery is not used, bad sectors may not be created in the hard disk drives 505 or SSDs. For example, even if a capacitor or a low-cost, small-capacity battery is used as the auxiliary power supply unit 514, bad sectors may not be created in the hard disk drives 505 or SSDs.

FIG. 6 shows the operation of each of the hard disk drives 212 and 505 in FIG. 2 or 5. This will be explained with reference to FIG. 6.

First, each of the hard disk drives 212 and 505 determines whether there is video data in its internal cache memory (step S601).

If there is video data in the cache memory, each of the hard disk drives 212 and 505 determines whether a head parking command (in the case of SSD, a standby command) has been input after recording the video data (step S602) and S603). Here, the head parking command (standby command in the case of SSD) is a command output from the control unit (207 and 502 in FIGS. 2 and 5).

The steps S601 to S603 are repeatedly performed until a head parking command (in the case of SSD, a standby command) is input. When a head parking command (standby command in the case of SSD) is input, step S604 and the following steps are performed.

In step S604, each of the hard disk drives 212 and 505 completes a write operation on the sector that is the target of the write operation currently in progress.

Next, each of the hard disk drives 212 and 505 determines whether there is video data in the cache memory provided therein (step S605).

If there is video data in the cache memory, each of the hard disk drives 212 and 505 performs head parking (standby operation in the case of SSD) after recording the video data (steps S606 and S607).

If there is no video data in the cache memory, each of the hard disk drives 212 and 505 performs head parking (in the case of SSD, a standby operation) (step S607).

When head parking is completed, each of the hard disk drives 212 and 505 outputs a head-parking completion signal (in the case of SSD, a standby-state signal) to the control unit (207 and 502 in FIGS. 2 and 5). (Step S608).

Steps S601 to S608 are repeatedly performed until an end signal is generated (step S609).

FIG. 7 shows the operation of the control units 207 and 502 in FIG. 2 or 5 when the supply power is cut off. The operation of the control units 207 and 502 will be described with reference to FIGS. 2, 5, and 7.

When a power cut-off signal is input from the supply power detection units 215 and 515 (step S701), the control units 207 and 502 perform control as follows.

First, the control unit (207, 502) forcibly terminates application programs that are currently using the hard disk drives (212, 505) or SSDs (step S702). This step S702 is preceded by performing the next step S703.

In step S703, the control unit 207, 502 unmounts the hard disk drives 212, 505 or SSDs from the operating system. Accordingly, video data cannot be input from the control units 207 and 502 to the hard disk drives 212 and 505 or SSDs.

Next, the control units 207 and 502 output a head parking command (in the case of SSD, a standby command) to each of the hard disk drives 212 and 505 (step S704).

When all head-parking completion signals (standby-state signals in the case of SSDs) of the hard disk drives 212 and 505 are input, the control units 207 and 502 turn on the auxiliary power units 214 and 514. Turn it off (steps S705, S706).

6 and 7, after the video data in the cache memory in the hard disk drives 212 and 505 or SSDs is recorded in step S602, in steps S702 and S703, the control unit 207 and 502 Video data cannot be input to hard disk drives 212, 505 or SSDs. Accordingly, by performing steps S702 and S703, the controllers 207 and 502 immediately perform a head parking operation (SSD) without performing an additional write operation (step S606) after the write operation of one sector (step S604) is completed. In this case, the standby operation is controlled to be performed. In addition, by performing steps S702 and S703, the control unit 207, 502 performs an additional recording operation after a head parking operation (standby operation in the case of SSD) is performed on each of the hard disk drives 212, 505. (Step S602) is controlled not to be performed.

As described above, according to the video recorder of this embodiment, when the supply power is cut off, it operates so that no additional recording operation is performed. Accordingly, the head parking operation or standby operation can be completed in a relatively short period of time after the supply power is cut off. Therefore, even if an expensive UPS or an expensive large capacity battery is not used, bad sectors may not be created in hard disk drives or SSDs.

For example, even if a capacitor or a low-cost, small-capacity battery is used as an auxiliary power supply, bad sectors may not be created in hard disk drives or SSDs.

So far, the present invention has been examined with a focus on preferred embodiments. A person skilled in the art to which the present invention pertains will understand that the present invention can be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered from an illustrative rather than a restrictive perspective. The scope of the present invention is indicated in the claims rather than the foregoing description, and the inventions claimed by the claims and inventions equivalent to the claimed inventions should be construed as included in the present invention.

The present invention is likely to be used not only in video recorders but also in various electronic devices equipped with recording media.

1a, 1b, 1c: Surveillance cameras, 2: Digital video recorder (DVR),
201 to 203: analog-digital conversion units,
204: multiplexer, 205: video signal generator,
207: control unit, 208: user input unit,
209: compression unit, 210: restoration unit,
211: Dynaic RAM,
212, 301 to 304: hard disk drives,
213: power supply unit, 214: auxiliary power unit,
215: supply power detection unit,
402: communication network, 401a to 401n: surveillance cameras,
5: Network Video Recorder (NVR),
403a to 403m: client computers,
501: communication interface,
502: Control unit, 503: RAM,
504: display interface, 505: hard disk drives,
513: power supply unit, 514: auxiliary power unit,
515: Supply power detection unit.

Claims (6)

In the video recorder, which has a control unit and recording media, and records video data of each channel on the recording media by the control unit,
an auxiliary power supply unit charged by power supplied to the video recorder; and
A supply power detection unit that measures the voltage of the supply power and generates a power cutoff signal when the voltage of the supply power disappears,
The control unit,
When the power supply detection unit generates the power cutoff signal, a head parking command or a standby command is output to each of the recording media,
In each of the recording media that has received the head parking command or standby command, the recording operation of video data in the cache memory is completed for the sector that is the target of the currently ongoing recording operation while operating by the power of the auxiliary power supply unit. And, after checking whether video data exists in the cache memory, recording the video data until there is no video data in the cache memory, and then controlling to perform a head parking operation or a standby operation. In claim 1,
A video recorder, wherein the auxiliary power supply is a battery or a capacitor. delete delete The method of claim 1, wherein the control unit,
When the power cut-off signal is generated from the power supply detection unit, application programs currently using the recording media are forcibly terminated,
After unmounting the recording media from the operating system,
A video recorder that outputs a head parking command or a standby command to each of the recording media. In claim 5,
Each of the recording media,
After performing the head parking or standby operation according to the head parking command or standby command, output a head-parking completion signal or a standby-state signal to the control unit,
The control unit,
A video recorder that turns off the auxiliary power unit when the head-parking completion signal or standby-state signal is input from each of the recording media.

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