Web cams and video conferencing Part II
Types Of Videos
Videoconferencing over the Internet.
Equipment necessary to perform their respective operations through a videoconference via the Internet look like a separate level of importance (Hardware and Software Requirements and Process via Internet videoconferencing).
Via videoconference through TV VideoPhone.
To make a video through the TV via VideoPhone need the following equipment:
A television whose resolution is optimal for viewing the video, we recommend a TV 21 "or more.
CAMCORDER * A camera which includes its own software, memory and the encoder / decoder.
A telephone line.
A phone that will bring the options of pulses and tones, we recommend the choice of tones.
A VCR and a computer VC5055.
Wiring: Telephone cable with RJ-11 connectors
Description of practice facility
It is necessary to connect the computer to dial the phone and VC5055 in their RJ-11 connectors.
Then you connect the camera to the computer CAMCORDER VC5055 in their respective video and audio inputs.
Tickets for video and audio equipment VC5055 should be connected to the output video and audio equipment VCR.
The output video and audio equipment VC5055 be connected to the input of video and audio from the TV.
The entrance to the TV antenna is connected to the output of the VCR's antenna equipment.
The entrance to the VCR antenna equipment goes directly to the external antenna or cable.
The team leaves for connecting the outlet of 110 volts.
Note: The same setting must be taken into account in the audiovisual remote.
Once installed and running the system in two audiovisual items is to make the video:
Suppose a user wishes to begin to communicate through the system it should take the phone and dial the code (phone number) assigned by the computer to the remote, once communication with the remote it will send video captured by the camera and audio captured by the phone's microphone to the source, which receptive audiovisual information via the TV, and vice versa.
We must note that sends the information to the camera at the TV is done by teams that are VC5055 VCR and equipment whose function is to convert digital signals into analog and vice versa, also controls the delay that exists to send signals video which aims to synchronize the audio with the video phone for the reception of audio-visual information is seen and heard by all participants in real time.
ISO standards for storage and recovery audiovisual.
The MPEG Standard Group (Moving Picture Experts).
The standards of ISO have established a working group, known as MPEG (Expert Group on moving image) to develop three standards for coding audiovisual signals for storage in digital media. The speeds for the three standards (MPEG1, MPEG2, MPEG3) are 1.5, 10 and 40 mbps respectively. The MPEG1 standard has three parts or layers (system, video, audio), which are mentioned briefly below.
Layer systems:A string of bit ISO is built in two layers, the outer layer is the layer system and the inner layer called compression. The system layer provides the functions necessary to use one or more strings of bits in a compressed system. The parts of video and audio of this specification define the compression coding layer for audio and video data. The coding of other data types not defined by the specification, but are supported by the layer system, allowing other types of data are attached to the compression system.
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