Another Educational Pickup from Yahoo: On PC Video Quality
by: isir 9396 of 9415
Many of you may have tried stream video on your PC via modem, the quality of pictures is simply NO good, including TV onthe WEB. From technical point of view, this is due to the video signal transmission rate TOO LOW.
Most people today use 28kbps modem. To have a true TV/Video quality, we need 384 kbps if we utilize today's best video compression standard. In the future, the 384 kbps rate could go lower if scientists invent better compression schemes to reduce the required data rate to, say, 128 kbps, and still maintain true video quality.
All said, I don't think 28 kbps will be ever sufficient to transmit true high quality motion video unless you reduce the number of picture frames per second. However, since new access technologies are being deployed to increase the end user's access rate from 28.8 kbps to >384 kbps. These new technologies include xDSL, Cable Modem, Broadband Wireless and Satellite. They are coming and already available in many cities in US. This is the so called last-mile/local loop battle. For those willing to learn more on last mile technologies, you may check telecomresearch.com
Happy investing,
Charlie Yang (an Ampex shareholder)
Managing Editor, TelecomResearch.com
|
