Drone Accessories
0102030405
User Manual of Video Encryption & Decryption Equipment
1：Principle of video encryption：
After collect CVBS videos and perform AD (analog-to-digital) conversion. The converted digital signal is encrypted through FPGA, and the video image is reprocessed. Then perform DA(digital-to-analog) conversion to generate a standar CVBS and output to the transmitter as shown in Figure (1)
2：Principle of video decryption：
We perform AD (analog-to-digital) conversion with the CVBS video signal received by the receiver, decrypt the converted digital signal through FPGA, reprocess the video image, and then output it for DA (analog-to-digital) conversion to convert it into standard CVBS and output it to the display as shown in Figure (1)
Principle diagram as below:
Figure 1
3：Parameter setting:
3.1：Open the configuration software, find the corresponding serial port number (Figure 2), select and open the serial port (Figure 3), click "read" to read the current device parameters
Figure 3
Figure4
3.2：Select the "scrambling" or "descrambling" mode as shown in Figure 5, and input the desired scrambling or descrambling sequence as shown in Figure 6
Figure 5
Figure 6
3.3：Press "Write" to write data as shown in Figure 7
Figure 7
4：Hardware connection:
4.1：Scrambling connection
Each pin definition
1：DC GND
2：DC 5-15V
3：Video GND
4：Video in（Connect to the camera or flight control OSD output）
5：Video GND
6：Video out（connect Tx）
7：TTL TXD
8：TTL GND
9：TTL RXD
2：Descrambling connection
Each pin definition：
1：DC GND
2：DC 5-15V
3：Video GND
4：Video in（connect with Rx video out）
5：Video GND
6：Video out（connect with display/VR）
7：TTL TXD
8：TTL GND
9：TTL RXD
Explanation of special circumstances: Due to the differences in the video range of the camera, video transmitter, and video receiving machine from different manufacturers, there may be differences in the video brightness when used.If this occurs, please follow the steps below to modify the module.
First remove the resistance on position "1"
If the video range is still not enough, remove the resistance at position "2" and short-circuit it