【 Weak current College 】 impact video conferencing system for real-time video and audio effects and solutions-Power By 【 China power house network 】

In the video conference system applications, the impact of video and audio effect of factors mainly concentrated in three areas:
1) network bandwidth;
2) hardware resources;
3) Conference room design.
A: network bandwidth
Network video conferencing system is based on pure software running on a network, as the name implies, the network is the foundation of Internet video conferencing, the good network environment will have a good effect of video conferencing, video conferencing network is running.
At present domestic bandwidth access, most units are ADSL or fiber access, due to the South-North passes, public network with different network environments such as campus network Interworking between blocked, so there is no guarantee that the video conference. To this end, the video conference system service provider operations center proposes a complete solution, your network can guarantee a point 100kbps circumstances (in this calculation, 512 k of access can support 5 point meeting), the use of video conferencing system provides IP multicast (specific implementation see video conference system mixed network solutions) to address the different issues under network environment, but also to relieve the pressure and streaming server, ensure that the network video conferencing for stable operation. Second: the hardware resources

Video conference system in addition to the network, you also need a computer, audio and video input and output devices, can be successfully carried out of the video conference.
For desktop video conferencing, computer CPU and memory, microphones, earphones or sound, air-head has certain requirements for meetings, video conference system at any time on your computer's hardware resources to monitor when your CPU at 100%, the sound will appear choppy, pause the video image will appear in, and for this you only rarely open video to computer hardware resources are not enough, you can only replace the hardware device; and the purchase of a good microphone and shooting phase head will bring you good audio and video effects.
For venue forms of video conferencing, computer hardware resources is the same as with the desktop, but for voice and video will have different requirements. The venue, in the form of a video conference you need a lot of people together for meetings, the number may be hundreds, thousands or tens of thousands, it is necessary to audio, amplifier, TV set or projector, video camera, video capture cards, etc. to meet the demand for General shooting phase head and reproducing the acquisition of distance and transport distance limited. And reproducing as audio output, the sound from microphone feedback back to form around the ECHO, therefore also need to load some echo cancellation equipment. See in particular the design of the third meeting room. 3. meeting room design
Conference room design is the impact of video conference one of the important factors, including meeting facilities, meeting room layouts, meeting environment. Conference room design involves a wide range of content, limited to length, we only list some factors and recommendations.
Conference Hall equipment including cameras, TV, microphone and sound system, specific audio signal input and output devices. Combined with different layout and decoration of the venue, these devices in configuration should be different, can truly guarantee meeting results. For example, the venue of sound reinforcement system must be in the hall layout for a good match can truly guarantee its effects, professional sound reinforcement system design relies on a complex sound field testing and repeated the debugging process.
Venue layout including General design, site area, Hall decoration and so on:
1) design of the venue you want to be able to realistically reflect the site figures and scenes, so that participants have a telepresence to achieve visual and language information for the exchange of good results, the transmission of images in the room include figures, scenes, charts, text, etc., should be legible;
2) venue area proposed by per capita 2.2 m2;
3) in order to prevent the color pair people photography produce "take photo" and "reflective" effect, so the background wall should have a uniform light color, usually use beige or grey, so that the camera lens aperture setting appropriate, but room for another three-sided walls, floor, ceiling, jiyong black or bright colors saturated color, usually blue, light grey, and every wall is not suitable for complex pattern or hanging complex picture, in order to avoid camera movement or zoom the image produce blurry when and increase coding overhead;
4) table layout using type. To reduce facial shadows, requires use of light colour desktop or tablecloth, between the microphone and desktop best plus one layer of soft materials, so as to avoid the percussion desktop too great when jealous;
5) as far as possible comfortable chair, at the feet of a wheel chair and don't pretend to restrict movement to prevent leaving the lens;
6) in order to guarantee the sound insulation, the floor should be covered with carpets, ceiling plate should be packed silencers, soundproof walls should be packed around, the window should double glazing, table covered with cloth;
7) light illumination is a video conference room for a basic condition for TV conference time with randomness, indoor artificial cold light source to avoid natural light. Conference rooms and doors with dark curtains shielding. Light on the human visual system without adverse effects. Select the trichromatic lamps (color temperature 3500K) more appropriate.
Meeting environment including indoor environment and surroundings:
1) Conference room should be installed air conditioning in order to create a stable temperature and humidity environment, the air conditioning noise should be relatively low, such as indoor air conditioning noise is too large, it will greatly affect the site's audio effects. Conference on indoor air flow should be;
2) Conference room should be set to stay away from outside noise, noisy location. Meeting room settings should conform to prevent leakage, easy to use and minimize the external noise requirements. Centre room overall layout diagram

Audio connection diagram

Video connection diagram

Other device connection diagram