KR100694465B1 - Data connection method of multi-channel digital video recorder system using power line communication - Google Patents

Abstract

A data connection method of a multi-channel digital video recorder system using PLC(Power Line Communication) is provided to be capable of continuously monitoring connected states of each channel in one thread to reconnect within the thread in case of a disconnected channel, thus real-time image data sent from each channel can be received with almost no loss. A particular channel is selected from multiple channels of a digital video recorder system (S11). The open state of the selected channel is confirmed(S12). If it is confirmed that the channel is closed, an on state of the channel is confirmed(S13). If it is confirmed that the channel is in off state, the next channel is selected(S21). If it is confirmed that the channel is in on state, the channel is open(S14).

Description

Data connection method of multi-channel digital video recorder system using power line communication}

1 is an example code for a data connection method of a multi-channel digital video recorder system using a power communication line according to the present invention.

2 is a flowchart illustrating a data connection method of a multi-channel digital video recorder system using a power communication line according to the present invention.

The present invention relates to a multi-channel digital video recorder system using a power communication line. More specifically, the channel is disconnected by continuously monitoring each channel in one thread, and the disconnected channel is retransmitted in the thread to be transmitted from each channel. The present invention relates to a data access method of a multi-channel digital video recorder system using a power communication line capable of receiving real-time image data without loss.

In general, power line communication (hereinafter abbreviated as PLC) sends a high-frequency communication signal of several hundred Hz to several tens of MHz to a power line that supplies AC electricity with a frequency of 50 to 60 Hz. It's a way of communicating. This method is very convenient because it can implement internet access, home LAN or digital video recorder system (hereinafter abbreviated as DVR) by connecting to an outlet without the need for expensive leased line or backbone network. It can be called economic.

In this case, the DVR refers to a system in which a closed circuit television (CCTV) based on a conventional analog system is applied to a digital system to monitor, search, and control in real time. These DVRs are based on TCP / IP communication in the LAN environment and are connected to the DVR using TCP / IP in a stable LAN environment. General DVR assumes stable TCP / IP connection and maintains connection with general TCP / IP communication method that connects to DVR at login and disconnects at logout.

On the other hand, a power line lacking stability as a communication line can transmit a voice or a simple control signal through a protocol provided by a chip set manufacturer or a small amount of data through the TCP / IP, so that multi-channel communication is possible.

However, the video data for the DVR is difficult to receive from the multi-channel in real time because the data amount is large. In other words, in the present PLC, the connection state is not continuous and there is a high possibility of disconnection momentarily in order to continuously process a large amount of data such as a video in a multi channel.

In other words, multi-channel video data under power lines can put a significant load on the PLC, resulting in unstable connections. Accordingly, a power line requires a TCP / IP connection method different from that of a general TCP / IP connection. That is, the power line is not originally intended for communication, so it is weak to noise that interferes with communication. Data signals through the PLC can disappear or fade as electricity flows through transformers. Also, when using other electrical devices, instantaneous power flows and affects data transmission. Naturally, these PLCs have considerably higher packet loss and delay rates. In fact, when implementing DVR with PLC, TCP / IP connection is not as stable as existing LAN environment, DVR connection is frequently disconnected and packets are continuously lost.

Therefore, in order to implement a multi-channel DVR in a PLC, a data connection must be implemented by a method different from a general DVR in a TCP / IP environment using a conventional LAN, and a method of quickly reconnecting and restoring a data connection when the connection is lost. One such method is not yet developed.

The present invention is to overcome the above-mentioned problems, the object of the present invention is to continuously monitor the connection state of each channel in one thread, disconnected channel is re-connected in the thread in real time transmitted from each channel The present invention provides a data access method of a multi-channel digital video recorder system using a power communication line capable of receiving video data without loss.

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In order to achieve the above object, a data access method of a multi-channel DVR system using a PLC according to the present invention checks an open / close state and an on / off state of each channel when the multi-channel DVR system is executed. If the channel is open, the channel is opened. If the channel is closed / off, the next channel is selected. If the channel is open / on, the next channel is selected. If the channel is open / off, the channel is closed. The thread can run.
Here, although already known to those skilled in the art, the meaning of several terms is defined. First, "channel open" refers to a state in which a corresponding channel is selected, that is, a channel used to transmit data. In addition, "channel closed" means a state in which a corresponding channel is set not to be used for data transmission. In addition, "channel on" refers to a state of a corresponding channel, which means that there is no problem in data transmission (connected state). Lastly, "channel off" refers to a state in which a problem occurs in data transmission (disconnected state) regarding the state of a corresponding channel.
Here, the thread may be created if the login is successful.
In addition, the thread may be terminated when the logoff (logoff).

In addition, the thread selects a channel (S11) for selecting a specific channel among the multi-channels of the DVR system, a channel open state checking step (S12) for checking an open state of the selected channel, and the channel open state. When the channel is confirmed to be in a closed state in the confirming step (S12), the channel on state checking step (S13) for checking the on state of the channel (S13), and the channel is turned off in the channel on state checking step (S13). If the status is confirmed, the next channel selection step (S21) of selecting the next channel may be performed.

In addition, the thread selects a channel (S11) for selecting a specific channel among the multi-channels of the DVR system, a channel open state checking step (S12) for checking an open state of the selected channel, and the channel open state. When the channel is confirmed to be in a closed state in the checking step (S12), the channel on state checking step (S13) for checking the on state of the channel (S13), and the channel is turned on in the channel on state checking step (S13). If the status is confirmed, the channel opening step (S14) for opening the channel and the next channel selection step (S21) for selecting the next channel may be made.

In addition, the thread selects a channel (S11) for selecting a specific channel among the multi-channels of the DVR system, a channel open state checking step (S12) for checking an open state of the selected channel, and the channel open state. When the channel is confirmed to be in an open state in the verifying step (S12), the channel on state checking step (S15) for checking the on state of the channel (S15), and the channel on state checking step (S15) is confirmed in the on state. When the next channel selection step (S21) can be made.

In addition, the thread selects a channel (S11) for selecting a specific channel among the multi-channels of the DVR system, a channel open state checking step (S12) for checking an open state of the selected channel, and the channel open state. When the channel is confirmed to be open in the checking step (S12), the channel on state checking step (S15) for checking the on state of the channel (S15), and the channel is turned off (off) in the channel on state checking step (S15). If it is confirmed as a state, the channel closing step (S16) for closing the channel and the next channel selection step (S21) for selecting the next channel may be made.

As described above, in the data access method of the multi-channel DVR system using the PLC according to the present invention, each channel is continuously monitored in one thread, and the disconnected channel is connected again in the thread, thereby allowing each channel to be connected. You can receive the real-time video transmitted from the maximum without loss. In other words, it is possible to restore the disconnected channel immediately without initializing the entire DVR system because the connection of the specific channel is lost, so that the DVR system can be efficiently operated.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings such that those skilled in the art may easily implement the present invention.

1, an example code of a data access method of a multi-channel DVR system using a PLC according to the present invention is shown.

As shown, the present invention first creates a predetermined thread, for example, dvrconnection_thread () upon successful login. In addition, the present invention terminates the thread, for example dvrconnection_thread (), when the logoff occurs.

Meanwhile, the thread as described above, that is, dvrconnection_thread () may be executed in various types of computers including various functions or variables as shown in the drawings, and the meanings of the various functions are as follows.

1. void dvrconnection_thread (void * p): This is a thread function that is a subject of the present invention and manages the connection of a multi-channel DVR.

2. int GetMaxDvrChannleCount (): informs the maximum number of channels of DVR.

3. BOOL GetDvrConnectionThreadState (): Informs whether or not the thread (dvrconnect_thread) is persisted.

4. BOOL IsDvrRunning (int ch): Checks the open status of the DVR channel received as a parameter. Due to the nature of the PLC, the connection to the DVR that has been connected may sometimes be lost. If the connection is lost or not established, this function returns a pulse.

5. BOOL IsDvrEnable (int ch): Checks whether the DVR channel received as a parameter is on / off. If the user has set the DVR channel setting to off in the program or application, this channel should be closed.

6. BOOL CloseDvr (int ch): Closes the DVR channel receiving the parameter.

7. BOOL OpenDvr (int ch): Opens DVR channel receiving parameters.

On the other hand, it should be recognized that such program example code is only an example, and that it can be implemented in a wide variety of programming languages. That is, the method according to the present invention is not limited to the program example code.

2, a data connection method of a multi-channel DVR system using a PLC according to the present invention is shown as a flowchart.

According to the present invention, when a multi-channel DVR system is executed, an open / close state of each channel (a state in which a corresponding channel is set to be used for transmitting data / a state in which the channel is set not to transmit data) and an on / off state (in data transmission) Check if there is no problem / interruption of data transmission, and if the channel is closed / on (the channel is set to not transmit data / no problem with data transmission), open the channel (the corresponding status). Set the channel to be used to transmit data), select the next channel if the channel is in the closed / off state (the channel is set to not transmit data / interrupting data transmission) and the channel is open If the status is ON (the channel is set up to use to transmit data / the data transfer is intact), then The selection, and the channel is open / off state (a state in which the channel interfere with the set state // data transfer to be used for transmitting data), then the thread to close the main channel performed Jiro.

Here, the thread is selected for a channel selection step S11, a channel open state checking step S12, a channel on state checking step S13, a channel open step S14, and a channel on state checking step S15. And a channel close step S16 and a next channel select step S21.

In the channel selection step S11, a specific channel is selected among the multi-channels of the DVR system. This channel selection step selects the next channel sequentially after several steps are completed, regardless of whether the channel is open or closed. That is, if the channel 1 to the channel n is provided, the predetermined steps are performed by sequentially selecting the channel 1 to the channel n.

In the channel open state check step (S12), the open state of the selected channel is checked. That is, it checks and determines whether the selected channel is open or closed. In other words, it checks and determines whether the channel is set to transmit data or whether the channel is set to transmit data.

In the channel on state checking step S13, when the channel is checked and determined to be in a close state in the channel open state checking step S12, the channel on state checking step is checked. That is, it is checked and determined whether the channel is in an on state or an off state. In other words, it checks and determines whether the channel is in a state where data transmission is not interrupted or whether the channel is in the state of data transmission.

Here, when the channel is confirmed to be in an off state in the channel on state checking step S13, a next channel selecting step S21 for selecting a next channel is performed. In other words, if the user sets the DVR setting to OFF in a program or application, the user does not open the channel but performs the next channel selection step (S21).

However, if the channel is confirmed to be in the ON state in the channel on state checking step S13, the channel opening step S14 is performed. That is, even though the channel is closed by the user in the program or application, the channel is in a closed state, so the channel is opened immediately so that real-time video is provided.

In addition, when the channel opening step S14 is completed, the next channel selection step S21 for selecting the next channel is similarly performed.

Subsequently, in the present invention, if the channel is confirmed to be in the on state in the channel open state checking step S12, the channel on state checking step S15 is performed. That is, it is again checked whether the channel is on or off.

Of course, if the channel is confirmed to be in the on state (S15), the next channel selection step (S21) is immediately performed since the real-time video is normally provided.

Subsequently, if the channel is turned off in the channel on state checking step S15, since the user has turned off the DVR setting in the program or the application, the channel closing step S16 of closing the corresponding channel is performed.

Of course, when the channel closing step S16 is completed, the next channel selecting step S21 for selecting the next channel is likewise performed.

Meanwhile, although the description has been made with respect to the open / close and on / off states of channel 1 of the DVR, the present invention is also applicable to the channels 2 to n of the DVR.

As described above, in the data connection method of the multi-channel DVR system using the power communication line according to the present invention, each channel is continuously monitored in one thread, and the disconnected channel is connected again in the thread. The real-time video transmitted from each channel can be received without loss. In other words, if a particular channel is disconnected, only the channel which is automatically disconnected can be restored immediately without initializing the entire DVR system.

What has been described above is only one embodiment for implementing a data connection method of a multi-channel DVR system using a power communication line according to the present invention, the present invention is not limited to the above-described embodiment, in the claims below As claimed, any person having ordinary skill in the art without departing from the gist of the present invention will have the technical spirit of the present invention to the extent that various modifications can be made.

Claims (7)

When the multi-channel digital video recorder system is running, the open / closed status of whether each channel is enabled or disabled for data transmission, whether there is no problem with data transmission, or whether there is a problem with data transmission. Check the on / off status to open the channel if the channel is closed / on, select the next channel if the channel is closed / off, select the next channel if the channel is open / on, and A method of accessing data of a multi-channel digital video recorder system using a power communication line, characterized in that a thread for closing the channel is performed when a channel is open / off. 2. The method of claim 1, wherein the thread is created when a login is successful. 2. The method of claim 1, wherein the thread terminates when it logs off. The method of claim 1, wherein the thread is A channel selection step (S11) of selecting a specific channel among the multi-channels of the digital video recorder system, A channel open state checking step (S12) of checking an open state of the selected channel; A channel on state checking step (S13) of checking an on state of the channel when the channel is confirmed to be in a close state in the channel open state checking step (S12); And a next channel selection step (S21) of selecting a next channel when the channel is turned off in the channel on state checking step (S13). The method of claim 1, wherein the thread is A channel selection step (S11) of selecting a specific channel among the multi-channels of the digital video recorder system, A channel open state checking step (S12) of checking an open state of the selected channel; A channel on state checking step (S13) of checking an on state of the channel when the channel is confirmed to be in a close state in the channel open state checking step (S12); A channel opening step (S14) of opening the channel when the channel is confirmed to be in an on state in the channel on state checking step (S13); A next channel selection step (S21) of selecting a next channel, wherein the data connection method of a multi-channel digital video recorder system using a power communication line. The method of claim 1, wherein the thread is A channel selection step (S11) of selecting a specific channel among the multi-channels of the digital video recorder system, A channel open state checking step (S12) of checking an open state of the selected channel; A channel on state checking step (S15) of checking an on state of the channel when the channel is open in the channel open state checking step (S12); And a next channel selection step (S21) of selecting a next channel when the channel is turned on in the channel on state checking step (S15). The method of claim 1, wherein the thread is A channel selection step (S11) of selecting a specific channel among the multi-channels of the digital video recorder system, A channel open state checking step (S12) of checking an open state of the selected channel; A channel on state checking step (S15) of checking an on state of the channel when the channel is open in the channel open state checking step (S12); A channel closing step (S16) of closing the channel when the channel is turned off in the channel on state checking step (S15); A next channel selection step (S21) of selecting a next channel, wherein the data connection method of a multi-channel digital video recorder system using a power communication line.

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