This still doesn't make computer-mediated motion viable with common modems over telephone lines. Most large companies use dedicated computer-mediated conferencing connections. Data compression may be done with special hardware or software on a computer with good processing capability. Picture segmentation divides a frame into squares and only sends the squares where the image has changed. Data compression has been incorporated into most commercial computer-mediated conferencing systems.
Sound presents a different set of problems for computer-mediated conferencing.
By cutting off all sounds below 40hz and above 20Khz, the amount of data to be transferred is reduced. K samples per second to achieve CD quality sound. Compression techniques have reduced that amount of data. Segmentation cannot be used without skips in the sound. Standards Initially, computer-mediated conferencing systems used proprietary techniques.