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White Stripes Occur When Real-Time Videos Are Played on the IVS Client

Publication Date:  2019-04-23 Views:  107 Downloads:  0

Issue Description

1. 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.

2. Symptom: 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. 

Handling Process

1. Replace the camera. The problem persists.

2. 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. 


Root Cause

The output 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.

Solution

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.

Now the problem is solved.

The following figure shows the video after the DC voltage regulator is added.

Suggestions

During the 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 system.

END