TWI637633B - Method for operating a digital video recording system - Google Patents

Abstract

The digital video recording system includes a control terminal, a plurality of digital camera devices, and a transmission medium. The control terminal broadcasts the setting instruction to the digital camera through the transmission medium to make the digital camera enter the connection mode. In the connection mode, each digital camera device repeatedly sends a registration signal to the control end within a random time after waiting for a random time. When the first digital camera device transmits the first registration signal and the other digital camera devices are on standby, the control terminal mediates the first registration signal to obtain the first registration number corresponding to the first digital camera device. The control terminal transmits a modulation frequency corresponding to the first digital camera device to the first digital camera device. The first digital camera device transmits the image content captured by the first digital camera device according to the modulation frequency.

Description

Operation method of digital video recording system

The invention relates to a digital video recording system, in particular to a digital video recording system capable of automatically assigning modulation frequencies.

Since the monitor can monitor the image of a specific place for a long time, it has become a common device to maintain public order and personal property security today. However, the monitoring range of each monitor is limited, so when the range to be monitored is wide, multiple monitors are required. In order to facilitate management, the prior art often centrally manages each monitor through a single central video recording device, and chooses whether to store the image content captured by a specific monitor.

FIG. 1 is a schematic diagram of a surveillance video system 100 of the prior art. In the first figure, the central recording device 110 is coupled to N monitors 120, where N is a positive integer. Since the monitor 120 transmits the image content through analog signals, each monitor 120 must transmit the image content through an independent transmission line, and the central recording device 110 is coupled to each of the monitors 120 through N transmission lines. In other words, with the increase of the number of monitors 120, the lines of the surveillance video system 100 will become more complicated, which not only causes difficulties for installation workers, but also often leads to inconveniences in management and maintenance.

Although there are previous technologies that transmit image content through digital signals and frequency modulation technology to enable the transmission of image content from multiple monitors on a single transmission line, in order to ensure that each monitor coupled to the same transmission line uses a different The modulation frequency is used to transmit signals to avoid mutual interference, which not only complicates the setting, but also causes inconvenience in use and management.

An embodiment of the present invention provides a method for operating a digital video recording system. The digital video recording system includes a control terminal, a plurality of digital camera devices, and a transmission medium. The transmission medium is coupled to the control terminal and the plurality of digital camera devices. The operation method of the digital video recording system includes a control terminal broadcasting a setting instruction to a plurality of digital camera devices via a transmission medium. When receiving the setting command, the digital camera device enters a connection mode. In the connection mode, each digital camera device repeatedly sends a registration signal to the control end via the transmission medium according to the initial modulation frequency after waiting for a random standby time, and continuously sends the registration signal for a random registration time. The registration signal contains the registration number of the digital camera. When the first digital camera device transmits the first registration signal via the transmission medium, and the other digital camera devices except the first digital camera device are on standby, the control end uses the initial modulation frequency to tune the first registration signal to obtain the first digital The first registration number corresponding to the camera device, the control end transmits the first modulation frequency corresponding to the first digital camera device to the first digital camera device via the transmission medium according to the first registration number, where the first modulation frequency and the initial adjustment frequency Variable frequencies differ. The control end records the correspondence between the first modulation frequency and the first registration number. When the first digital camera device receives the first modulation frequency, the first digital camera device changes to send the first digital camera device according to the first modulation frequency. The registration signal, and after the control end mediates the first registration signal by using the first modulation frequency, the control terminal sends a connection completion instruction to the first digital camera device to make the first digital camera device out of the connection mode.

FIG. 2 is a schematic diagram of a digital video recording system 200 according to an embodiment of the present invention. The digital video recording system 200 includes a control terminal 210, N digital camera devices 220 ₁ to 220 _N, and a transmission medium 230. The control terminal 210 may be coupled to the N digital camera devices 220 ₁ to 220 _N through a transmission medium 230, where N is an integer greater than 1. The control terminal 210 may be, for example, a digital video recorder (Digital Video Recorder, DVR), and may control the digital camera devices 220 ₁ to 220 _{N to} perform recording and playback functions through the transmission medium 230. In some embodiments of the present invention, the control The terminal 210 may further include a display screen to display image content obtained by the digital camera devices 220 ₁ to 220 _N. The transmission medium 230 may be, for example, but not limited to, a coaxial cable, a twisted pair, or a wireless network.

In FIG. 2, the lines of the digital camera devices 220 ₁ , 220 ₂ and 220 ₃ which can be shared are coupled to the transmission medium 230, and the digital camera devices 220 ₄ to 220 _N can be connected to the transmission medium 230 through separate lines. However, the present invention is not limited to this. In other embodiments of the present invention, the digital camera devices 220 ₁ to 220 _N may be connected to the transmission medium 230 in other ways according to actual needs.

Since the digital camera devices 220 ₁ to 220 _N output the acquired image content in the form of digital signals, each digital camera device 220 ₁ to 220 _N modulates its digital output signal with different modulation frequencies. In the case, the digital camera devices 220 ₁ to 220 _N can simultaneously send digital signals to the control terminal 210 through the transmission medium 230, and the control terminal 210 can adjust the digital signals sent by the digital camera devices 220 ₁ to 220 _N according to various modulation frequencies. Signal and obtain the image content transmitted by each digital camera 220 ₁ to 220 _N after mediation.

In the prior art, in order to ensure that each digital camera device 220 ₁ to 220 _N will use a different modulation frequency, so as to avoid conflicts between the output signals and cause the control end 210 to fail to parse, the control end 210 uses an additional one-to-one Transmission line to set the modulation frequency of each digital camera 220 ₁ to 220 _N. However, in this way, not only is it difficult to set up the transmission line, but also each digital camera device 220 ₁ to 220 _{N must} be set one by one during the setting, causing inconvenience in use. In addition, in the prior art, in the process of manufacturing digital camera devices 220 ₁ to 220 _N , the modulation frequency of each digital camera device is set in advance, and when the digital video recording system 200 is set, a digital with a different modulation frequency is selected. Camera. In this way, not only is it less flexible in use, but also if the digital video recording system 200 is expanded in the future, it will also increase the difficulty of installing a digital camera.

FIG. 3 is a flowchart of an operation method 300 of a digital video recording system 200 according to an embodiment of the present invention. Through the method 300, the digital video recording system 200 does not need an additional one-to-one transmission line, and can automatically complete the procedure of allocating the modulation frequency of the digital video cameras 220 ₁ to 220 _{N to} simplify the setting process of the digital video recording system 200. The operation method 300 may include steps S310 to S370:

S310: The control terminal 210 broadcasts the setting instruction to the digital camera devices 220 ₁ to 220 _N via the transmission medium 230;

S320: When receiving the setting instruction, the digital camera devices 220 ₁ to 220 _N enter the connection mode;

S330: In the connection mode, each digital camera device 220 ₁ to 220 _N repeatedly sends a registration signal to the control terminal 210 according to the initial modulation frequency within a random registration time after the standby random standby time;

S340: The control terminal 210 mediates the registration signals SIG _R1 to SIG _RN sent by the digital camera devices 220 ₁ to 220 _N to resolve the registration numbers corresponding to each digital camera device 220 ₁ to 220 _N ;

S350: Whether the registration numbers of all the digital camera devices 220 ₁ to 220 _N have been obtained; otherwise, proceed to step S360, and if so, proceed to S370;

S360: Whether the predetermined time has been exceeded, if not, proceed to step S340, and if so, proceed to S390;

S370: The control terminal 210 transmits the modulation frequency corresponding to the digital camera devices 220 ₁ to 220 _{N to} the digital camera devices 220 ₁ to 220 _N according to the registration numbers of the digital camera devices 220 ₁ to 220 _N ;

S372: The control terminal 210 records the correspondence between the registration numbers and the modulation frequencies corresponding to the digital camera devices 220 ₁ to 220 _N ;

S374: Upon receiving the digital imaging apparatus 220 corresponding to the modulation frequency ₁ to 220 _N, the digital imaging apparatus 220 ₁ to 220 _N to issue a registration signal SIG changed according to the modulation frequency of its corresponding _R1 SIG to _{the RN;}

S376: When the control terminal 210 completes the registration signals SIG _R1 to SIG _{RN using} the modulation frequency corresponding to the digital camera devices 220 ₁ to 220 _N , the control terminal 210 sends a connection completion instruction to the digital camera devices 220 ₁ to 220 _N so that The digital camera 220 ₁ to 220 _{N is} disconnected from the connection mode;

S380: The setting is completed.

S390: Report an error.

In step S310, the control terminal 210 broadcasts the setting instruction to the digital camera devices 220 ₁ to 220 _N via the transmission medium 230. In step S320, when the setting instruction is received, the digital camera devices 220 ₁ to 220 _N enter the connection mode. In the connection mode, each of the digital camera devices 220 ₁ to 220 _N will repeatedly send a corresponding registration signal to the control end 210 according to the initial modulation frequency after waiting for a random standby time, and will continue to send a random Registration time.

FIG. 4 is a schematic diagram of digital camera devices 220 ₁ to 220 _N sending registration signals in a connection mode according to an embodiment of the present invention. In Figure 4, each of the digital camera devices 220 ₁ to 220 _N randomly determines the respective standby time, and starts to send its corresponding registration signal after the random standby time has elapsed, and will continue to send a random The registration time, and then after a random time of standby, the corresponding registration signal is sent within the random registration time. This is repeated until the control end 210 sends a connection completion instruction to the digital camera 220 ₁ to 220 _N , and makes the digital camera Devices 220 ₁ to 220 _{N are} out of connected mode.

For example, in FIG. 4, when the digital camera devices 220 ₁ to 220 _{N have} just entered the connection mode, the digital camera device 220 ₁ may stand by for 3 seconds and continue to pass through the transmission medium 230 for the next 6 seconds. Send the registration signal SIG _R1 corresponding to the digital camera 220 ₁ , and then the digital camera 220 ₁ may wait for another 9 seconds and continue to send the corresponding digital camera 220 ₁ via the transmission medium 230 within the next 3 seconds. Register signal SIG _R1 and so on. In other words, the digital camera 220 ₁ repeatedly alternates between standby and sending signals, and each standby time and registration time are randomly determined, so they may be the same or different. Similarly, the digital camera devices 220 ₂ to 220 _N also alternately alternate between standby and sending signals, and each standby time and registration time are randomly determined, so they may be the same or different.

In some embodiments of the present invention, the digital camera devices 220 ₁ to 220 _N may set a random time according to the number N of the digital camera devices in the digital video recording system 200. For example, if the variable n is a randomly generated integer from 0 to N and t is a unit time preset by the system, such as, but not limited to, a digital camera 220 ₁ to 220 _{N is} sufficient to send a complete registration signal for the control end The shortest time of 210 analysis, the digital camera devices 220 ₁ to 220 _N can set the product of the variable n and the unit time t as a random time after the variable n is randomly generated. In this way, it is possible to generate an option sufficient for each digital camera device 220 ₁ to 220 _{N to} generate a different random time, and not to cause an excessively long standby time to delay the overall setting time. Taking the embodiment shown in FIG. 4 as an example, the unit time t is 3 seconds. Therefore, the random standby time and random registration time determined by the digital camera 220 ₁ can be multiples of 3 seconds. The invention is not limited to this. In other embodiments of the present invention, the digital camera devices 220 ₁ to 220 _N may also set the unit time t to another value according to the requirements of the system, or may be determined according to other methods. Its random standby time and random registration time.

In addition, in step S330, the digital camera devices 220 ₁ to 220 _N will send their registration signals with the same initial modulation frequency. Therefore, in step S340, if more than one digital camera device sends out the same signal at the same time, The respective registration signals will cause the control end 210 to fail to parse its signals. At this time, the control end 210 will ignore the signals sent by these digital camera devices until only one digital camera device sends out its registration signal at the same time, and When the other digital camera devices are in the standby state, the control terminal 210 can modulate the registration signals it receives and obtain the content of the messages contained therein.

For example, in the period T1 of FIG. 4, the digital imaging apparatus 220 ₁ via the transmission medium 230 transmits registration signal SIG _R1, and at the same time within the period T1, 220 ₁ to 220 _N digital imaging device, in addition to the digital imaging apparatus 220 ₁ Other digital camera devices 220 ₂ to 220 _N are in standby state. At this time, the control terminal 210 can adjust the registration signal SIG _R1 to obtain the message content contained in the registration signal SIG _R1 , for example, the digital camera device 220 ₁ corresponds to Registration number. 220 according to _a digital number corresponding to the registration image pickup apparatus, the control terminal 210 can transmit a command dedicated to the digital imaging apparatus _2201, without the ₂₂₀₂ to 220 _N malfunction of other digital imaging device. In some embodiments of the present invention, the registration signal SIG _R1 may also include other information, such as the model of the digital camera, the date of manufacture, etc., so that the control terminal 210 can distinguish the digital camera 220 ₁ to 220 _N difference between.

In addition, during the period T2 in FIG. 4, the digital camera 220 ₂ transmits its registration signal SIG _R2 via the transmission medium 230, and the digital camera 220 ₃ also transmits its registration signal SIG _R3 via the transmission medium 230 at the same time. At this time, the registration signal The SIG _R2 and the registration signal SIG _R3 will interfere with each other, so that the control terminal 210 cannot mediate the information contained in the registration signal SIG _R2 and the registration signal SIG _R3 . In this case, the control terminal 210 will ignore the registration signal SIG _R2 and the registration signal SIG _R3 . However, in the period T3 in FIG. 4, the digital camera 220 ₂ continues to transmit its registration signal SIG _R2 via the transmission medium 230, and the digital camera 220 ₃ has stopped transmitting the registration signal SIG _R3 . If the other digital camera devices other than the device 220 ₂ are in the standby state and the duration of the time period T3 is long enough, the control terminal 210 can mediate the registration signal SIG _R2 during the time period T3 and analyze the digital camera device 220 ₂ Corresponding registration number.

When it is determined in step S350 that the control end 210 has adjusted the registration numbers corresponding to all the digital camera devices 220 ₁ to 220 _N , the operation method 300 proceeds to step S370 to set the modulation frequency. However, if the control terminal 210 has not yet adjusted the registration numbers corresponding to all the digital camera devices 220 ₁ to 220 _N , the operation method 300 will proceed to step S360. In step S360, if the control terminal 210 cannot adjust the A registration number of the digital camera device 220 ₁ to 220 _N indicates that some digital camera devices may not respond smoothly. At this time, the operation method 300 executes step S390 to report an error message and prompt the manager to perform further detection. If the overall procedure is still within the predetermined time, the operation method 300 will return to step S340, and the control terminal 210 will continuously analyze the registration signals SIG _R1 to SIG _RN issued by the digital camera devices 220 ₁ to 220 _N.

In step S370, the control terminal 210 may transmit the modulation frequency corresponding to the digital camera devices 220 ₁ to 220 _{N to} the digital camera devices 220 ₁ to 220 _N according to the registration numbers of the digital camera devices 220 ₁ to 220 _N. In step S372, the control terminal 210 records the correspondence between the modulation frequencies corresponding to the digital camera devices 220 ₁ to 220 _N and their registration numbers. Generally speaking, the digital camera devices 220 ₁ to 220 _N will correspond to different modulation frequencies, and the digital camera devices 220 ₁ to 220 _N will have different modulation frequencies from the initial modulation frequencies. Table 1 is a correspondence table between a registration number and a modulation frequency according to an embodiment of the present invention.

Table 1         <TABLE border = "1" borderColor = "# 000000" width = "85%"> <TBODY> <tr> <td> Registration number </ td> <td> Modulation frequency </ td> </ tr> < tr> <td> A00001 </ td> <td> 177MHz </ td> </ tr> <tr> <td> A00002 </ td> <td> 261MHz </ td> </ tr> <tr> <td > ... </ td> <td> ... </ td> </ tr> <tr> <td> B00009 </ td> <td> 530MHz </ td> </ tr> </ TBODY> < / TABLE>

Digital imaging means when the digital imaging apparatus of a registration number ₂₂₀₁ of A00001, and the registration number of the digital imaging apparatus ₂₂₀₂ is A00002, then according to Table 1 can be known digital imaging apparatus ₂₂₀₁ corresponding to modulation frequency was 177MHz, and ₂₂₀₂ The corresponding frequency conversion rate is 261MHz. When the digital camera devices 220 ₁ to 220 _N receive their corresponding modulation frequencies, the digital camera devices 220 ₁ to 220 _N may change in step S374 to use their corresponding modulation frequencies to modulate their registration signals SIG _R1 To SIG _RN .

In other words, the digital camera 220 ₁ to 220 _N can modulate the registration signals SIG _R1 to SIG _RN according to different modulation frequencies. For example, the digital camera 220 ₁ will use the modulation frequency 177 MHz to modulate the registration signal SIG _R1. The digital camera 220 ₂ will use the modulation frequency 261 MHz to modulate the registration signal SIG _R2 . Therefore, even when the digital camera devices 220 ₁ to 220 _N send registration signals SIG _R1 to SIG _RN at the same time, the control terminal 210 can still adjust each digital camera device according to the specific modulation frequency corresponding to each digital camera device 220 ₁ to 220 _N. Registration numbers in the registration signals SIG _R1 to SIG _RN issued by a digital camera 220 ₁ to 220 _N.

Because in step S372, the control terminal 210 has recorded the correspondence between the registration numbers and modulation frequencies corresponding to the digital camera devices 220 ₁ to 220 _N , so the control terminal 210 mediates the registration signal according to the specific modulation frequency and obtains When the registration number is included, it can be confirmed whether the setting is completed according to the corresponding relationship of its previous record. For example, if the registration number of the digital camera 220 ₁ is A00001, and the modulation frequency is 177 MHz, when the control terminal 210 uses the modulation frequency 177 MHz to adjust the registration signal SIG _R1 and obtain the registration number as A00001, the record represents a line with the control terminal 210, a digital imaging apparatus ₂₂₀₁ has been set up. However, if the control terminal 210 cannot adjust the registration signal SIG _R1 by using the modulation frequency 177MHz to obtain the registration number A00001, it means that the digital camera 220 ₁ may not be set up completely or there is a problem with the connection. At this time, the control terminal 210 can continues to send its corresponding modulation frequency of 177MHz to digital imaging apparatus _2201, to wait for the digital imaging apparatus ₂₂₀₁ to complete the setting. In addition, in some embodiments of the present invention, if the control terminal 210 is unable to set the digital camera devices 220 ₁ to 220 _N within a predetermined time, an error message may also be reported, so that the administrator can conduct further inspection.

In step S376, when the control terminal 210 using a digital imaging apparatus 220 ₁ to 220 _N corresponding to the time of the modulation frequency mediation Register signal SIG _R1 to SIG _RN and confirm the digital imaging apparatus 220 ₁ to 220 _N are completed set, the control terminal 210 may send a connection completion instruction to the digital camera devices 220 ₁ to 220 _N to release the digital camera devices 220 ₁ to 220 _N from the connection mode. After leaving the connection mode, the digital camera devices 220 ₁ to 220 _N will stop sending registration signals SIG _R1 to SIG _RN , and can transmit the captured image content according to the instruction of the control terminal 210, and each digital camera device 220 ₁ Up to 220 _N will use its corresponding modulation frequency to modulate digital image content. For example, in the foregoing embodiment, the digital imaging device ₂₂₀₁ based on the modulation frequency of 177MHz transmitted digital imaging device capture ₂₂₀₁ of the video content to the control terminal 210, and can transmit digital imaging device 220 _according to modulation frequency 261MHz The image content captured by the digital camera 220 ₂ is transmitted to the control terminal 210. In this way, the control terminal 210 can adjust the received signals according to different modulation frequencies and obtain image content transmitted by different digital camera devices.

In the part of the present embodiment of the invention, the digital imaging apparatus 220 ₁ to 220 _N corresponding to the registration number by the digital imaging apparatus ₂₂₀₂ to 220 _N self-generated in random number, and therefore the digital imaging apparatus 220 ₁ to 220 _N is likely to produce If the same registration number is issued, the control terminal 210 may request the digital camera with the same registration number to generate a new registration number again. For example, if the control terminal 210 after obtaining the digital image pickup apparatus ₂₂₀₁ and ₂₂₀₂ corresponding to the registration number, find digital imaging apparatus ₂₂₀₁ and ₂₂₀₂ have the same registration number, the control terminal 210 at this time via a transmission medium can 230 transmits a number update instruction to cause the digital camera devices 220 ₁ and 220 ₂ to regenerate the updated registration numbers. This process can be repeated until the registration numbers of each of the digital camera devices 220 ₁ to 220 _N are different from other digital camera devices.

Further, since the operation of the method 300, control terminal 210 is after obtaining the registration numbers of all the digital imaging apparatus 220 ₁ to 220 _N, only issued corresponding modulation frequency of the digital imaging apparatus 220 ₁ to 220 _N, and different The attenuation degree of the modulation frequency during transmission is different. Therefore, the control end 210 can also set each digital camera device 220 according to the intensity of receiving the registration signals SIG _R1 to SIG _RN of each digital camera device 220 ₁ to 220 _N. Modulation frequency corresponding to ₁ to 220 _N.

For example, the distance between the control end 210 and the digital camera 220 ₁ may be long, or the quality of the line passing through it may be poor, resulting in the strength of the registration signal SIG _R1 issued by the digital camera 220 ₁ being weak. The distance between the control end 210 and the digital camera 220 ₂ is relatively short, or the quality of the line passing through is better, which results in the stronger strength of the registration signal SIG _R2 issued by the digital camera 220 ₂ . Because the attenuation of low-frequency signals during transmission is usually less than that of higher-frequency signals, in this case, the control end 210 can set the modulation frequency corresponding to the digital camera 220 ₁ lower than that of the digital camera 220 ₂ . Corresponding modulation frequency. In this way, the weaker registration signal SIG _R1 can be transmitted at a lower modulation frequency to reduce the further decline of the registration signal SIG _R1 .

Through the operation method 300, the digital video recording system 200 can automatically assign the digital camera devices 220 ₁ to 220 _N to different modulation frequencies without setting in advance, and the digital camera devices 220 ₁ to 220 _N wiring has some influence. Therefore, the operation method 300 can effectively simplify the setting process of the digital video recording system 200, and is more flexible in management and easy to expand or change.

In addition, in some embodiments of the present invention, the control terminal 210 may output a corresponding modulation frequency each time a registration number of the digital camera is obtained, and after recording the relationship between the registration number and the modulation frequency, The digital camera that has been set up is first out of the connection mode. For example, when the method of operation 300 parses digit registration number image pickup device ₂₂₀₁ in the step S340, to skip the first step S350 and S360, and direct step S370, so that the control terminal 210 apparatus ₂₂₀₁ according to the digital camera the registration number corresponding to the transmission frequency of the digital modulation of the imaging apparatus ₂₂₀₁ to the digital imaging apparatus 220 _1. Next, after performing step S372 and S374, the digital imaging device 220 _a corresponding to the registration number A00001 and modulating frequency corresponding relationship record between 177MHz completed, and the control terminal 210 confirms the digital imaging apparatus ₂₂₀₁ has been changed to adjust frequency After modulating and outputting the registration signal SIG _R1 at a rate of 177 MHz, the control terminal 210 is directly caused to send a connection completion instruction to the digital camera 220 _{1 so} as to release the digital camera 220 ₁ from the connection mode.

In other words, step S376 will be replaced, so the control terminal 210 does not need to wait for all the digital camera devices 220 ₁ to 220 _N to finish setting before sending the connection completion instruction. In this way, the digital camera 220 ₁ whose modulation frequency has been set can be disconnected from the connection mode and stop sending the registration signal SIG _R1 , thereby reducing the digital camera 220 ₁ to 220 _N and sending the registration signals SIG _R1 to SIG _RN at the same time. Probability, so that other digital camera devices 220 ₂ to 220 _N can complete the setting more quickly.

In summary, through the operation method of the digital video recording system provided by the embodiment of the present invention, the digital camera device in the digital video recording system can be automatically assigned to different modulation frequencies without setting in advance. And it will not be affected by the wiring of the digital camera. Therefore, the operation method of the digital video recording system of the present invention can effectively simplify the setting process of the digital video recording system, and is more flexible in management and easy to expand or change. The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the scope of patent application of the present invention shall fall within the scope of the present invention.

100 Surveillance and recording system 110 Central recording device 120 Monitor 200 Digital video recording system 210 Control terminal 220 ₁ to 220 _N Digital camera device 230 Transmission medium 300 Method S310 to S390 Steps T1, T2, T3 SIG _R1 to SIG _RN registration signal

FIG. 1 is a schematic diagram of a prior art digital video recording system. FIG. 2 is a schematic diagram of a digital video recording system according to an embodiment of the present invention. FIG. 3 is a flowchart of the operation method of the digital video recording system of FIG. 1. FIG. 4 is a schematic diagram of the digital camera device of FIG. 1 sending a registration signal in a connection mode.

Claims (10)

A method for operating a digital video recording system. The digital video recording system includes a control terminal, a plurality of digital camera devices, and a transmission medium. The transmission medium is coupled to the control terminal and the digital camera devices. The method includes: The control terminal broadcasts a setting instruction to the digital camera devices via the transmission medium; when the setting instruction is received, the digital camera devices enter a connection mode; in the connection mode, each digital camera device repeats a standby mode. After a random standby time, a registration signal is sent to the control end via the transmission medium according to an initial modulation frequency, and the registration signal is continuously sent for a random registration time, the registration signal including a registration number of the digital camera device; when the One of the digital camera devices transmits a first registration signal via the transmission medium, and when the digital camera devices other than the first digital camera device are on standby, the control The terminal uses the initial modulation frequency to mediate the first registration signal to obtain the first A first registration number corresponding to the digital camera device; the control end transmitting a first modulation frequency corresponding to the first digital camera device to the first digital camera device via the transmission medium according to the first registration number, the The first modulation frequency is different from the initial modulation frequency; the control terminal records the correspondence between the first modulation frequency and the first registration number; when the first digital camera device receives the first modulation frequency The first digital camera device sends the first registration signal according to the first modulation frequency; and the control end sends a connection completion instruction after using the first modulation frequency to mediate the first registration signal. Go to the first digital camera to release the first digital camera from the connection mode. The method according to claim 1, further comprising: when one of the digital camera devices transmits a second registration signal through the transmission medium, and at the same time one of the digital camera devices third When the digital camera device transmits a third registration signal via the transmission medium, the control terminal ignores the second registration signal and the third registration signal. The method according to claim 1, further comprising: after the control terminal obtains the first registration number corresponding to the first digital camera device, the control terminal mediates one of the data transmitted from a second digital camera device The second registration signal to obtain a second registration number corresponding to the second digital camera device; when the second registration number is the same as the first registration number, the control end transmits a number update instruction through the transmission medium so that The first digital camera device regenerates an updated first registration number and causes the second digital camera device to regenerates an updated second registration number. The method according to claim 1, further comprising: after leaving the connection mode, the first digital camera device transmits the image content captured by the first digital camera device to the control terminal according to the first modulation frequency. The method as described in claim 1, further comprising: when the control terminal resolves the registration numbers of the digital camera devices, and records the correspondence between the modulation frequencies corresponding to the digital camera devices and the registration numbers Relationship, and using the modulation frequencies corresponding to the digital camera devices to mediate multiple registration signals sent by the digital camera devices, the control terminal sends a connection completion instruction to the digital camera devices to enable the Some digital cameras are out of this connection mode. The method according to claim 1, further comprising: when the control end cannot adjust a registration number of each digital camera within a predetermined time, the control end displays an error message. The method according to claim 1, wherein the control terminal transmits the first modulation frequency to the first digital camera device via the transmission medium according to the first registration number. The control terminal tunes out the digital camera devices. The plurality of registration numbers are executed after recording the correspondence between the plurality of modulation frequencies corresponding to the digital camera devices and the registration numbers. The method according to claim 7, further comprising: the control terminal setting a modulation frequency corresponding to each digital camera according to the intensity of the registration signal received by each digital camera. The method according to claim 8, wherein: when the control terminal receives the first registration signal sent by the first digital camera device, the intensity of the first registration signal is less than that of the second digital camera device. When the two registration signals are strong, the control terminal sets the first modulation frequency corresponding to the first digital camera device to be lower than the second modulation frequency corresponding to the second digital camera device. The method of claim 1, wherein the transmission medium is a coaxial cable, a twisted pair, or a wireless network.