Electronic television set top boxes for controlling access to IP network and receiving video on demand service and broadcasts, encoding and decoding digital contents, Electrical communication machines or apparatus for television conferences,comprising some or all of the following - television monitors, video monitors, screens, projectors, cameras, video cameras, video and audio tape and cassette recorders, DVD recorders, hard disk recorders, telephones, telephone speakers, videophones, echo c...

Electronic television set top boxes for controlling access to IP network and receiving video on demand service and broadcasts, and encoding and decoding digital contents; electrical communication machines and apparatus for television conferences, comprising television monitors, video monitors, screens, projectors, cameras, video cameras, video and audio tape and cassette recorders, DVD recorders, hard disk recorders, telephones, telephone speakers, videophones, echo cancelers, communication n...