The networking structure of the IVS system at a site is as follows: (1)
Front-end site: encoder (including the 3G module) + analog camera + solar power
supply system; (2) Transmission network: CDMA; (3) Background IVS server:
NVR6128G2 (MPU); Software version: eSpace VCN3000 V100R001C01SPC128; (4)
Decoding and video wall display: Decoder + DLP large screen.
The IVS client and DLP large screen are used to check front-end sites. In the
daytime, white stripes occur on all camera videos. In
the evening, no white stripes are displayed.
Replace the camera. The problem persists.
Replace the encoder. The problem persists.
3. Test the
power supply voltage of the encoder and camera in the daytime. The voltage is
13.7 to 15.2 V DC. The following figure shows the measured voltage.
4. Test the
power supply voltage of the encoder and camera in the evening. The voltage is
12.8 V DC. The following figure shows the measured voltage.
voltage of the solar power supply system cannot be stable at 12 V DC. The
changing voltage causes interference to the encoder and the camera.
A 12 V DC
voltage regulator is added at the front end site. The input is connected to the
solar battery, and the output is connected to the encoder and camera. The white stripes are caused by unstable power supply voltage.
the problem is solved.
following figure shows the video after the DC voltage regulator is added.
solution design, the functions and features of each module or system must be
taken into consideration. In the weak-current system, pay special attention to
the interference caused by the strong-current system to the weak-current