อินโฟมีเดีย คอมมูนิเคชั่น

บทความ

Videoconferencing system categories -ViDE

22-08-2560 10:31:52น.

Videoconferencing system categories — putting everything together

Looking at current videoconferencing systems, and how the vendors implement all the above, can be useful to divide systems into 4 broad categories:

  1. Software only codecs
    These are the simplest systems. They frequently work with any webcam and a headset, and are very fast to set up. They provide adequate quality and ease of use for many applications of personal videconferencing. Examples: Netmeeting, VCON vPoint.
  2. Desktop/Laptop USB or PCI hardware codecs
    These are the next step up in quality and price. They include special hardware to assist the encoding of the audio and video signals, but the decoding is still done by the computer. They might offer more options for connecting external audio and video, but they almost always come with their own camera (webcam quality) and some form of a headset or handset. Examples: Polycom Viavideo, VCON ViGo
  3. Set-top devices
    As the name implies, these are meant to be installed on top of a TV set. They are very easy to install, operate, maintain and support. These usually offer a lot of options for connecting other audio and video devices for input or output, and are often the preferred choice for setting up a videoconference room due to their mix of portability, quality, and price. Example: Polycom Viewstation, Tandberg 880
  4. PC-based integrated codecs
    These are a combination of the previous two. They are usually an industrial grade computer with specialized hardware cards which offer a lot of connectivity options like the set-top category, but still can run PC applications like the desktop category. They are very useful when group videoconferencing is combined with collaboration applications. Example: Polycom iPower

Here is a chart showing how each of the basic components is implemented commonly in these categories, and how they compare in various features.

Feature

Software
codecs

Desktop
systems

Set-top
devices

PC-based
integrated

Camera

Webcam

Webcam

PTZ CCD camera

PTZ CCD camera

Display

Computer
screen

Computer
screen

TV, projector or
flat display

TV, projector or
flat display

Microphone

Headset

Headset/
Handset

Table-top
microphone

Table-top
microphone

Speakers

Headset

Headset/
mini-speakers

TV speakers
or external

External speakers

Encoding/
Decoding

Software/
Software

Hardware/
Software

Hardware/
Hardware

Hardware/
Hardware

User interface

Computer
application

Computer
application

On screen
menu

On screen menu
plus computer
application

Control device

Mouse/
keyboard

Mouse/
keyboard

Remote control

Remote control
plus wireless
mouse/keyboard

Portability

High

High for USB
Low for PCI

Medium

Medium

Audio/video
input/output
connectivity

Low

Low

Medium/High

Medium/High

Audio/video
quality

Decent

Fairly Good

Very good

Very good

Ease of use

Medium

Medium

High

Medium

Collaboration
capabilities

High

High

Medium

High

Reliability/
ease of maintenance

Medium

Medium

High

High

Price

Very low

Low

Medium

High

Source: http://www.videnet.gatech.edu/cookbook.en/list_page.php?topic=5&url=req-basic.html&level=1&sequence=1&name=Basic%20Components