Walter Cronkite the CBS network coverage as violence and protests occurred outside the convention, as well as scuffles inside the convention hall. When Dan Rather was punched to the floor (on camera) by security personnel, Cronkite commented, "I think we've got a bunch of thugs here, Dan." The first publicly transmitted live trans-Atlantic program was broadcast via the Telstar satellite on July 23, 1962, at 3:00 pm EDT, and Cronkite was one of the main presenters in this multinational broadcast. The broadcast was made possible in Europe by Eurovision and in North America by NBC, CBS, ABC, and the CBC. The first
Satellite television which was distributed via satellite was usually sent scrambled or unscrambled in NTSC, PAL, or SECAM television broadcast standards. The analog signal is frequency modulated and is converted from an FM signal to what is referred to as baseband. This baseband comprises the video signal and the audio subcarrier(s). The audio subcarrier is further demodulated to provide a raw audio signal. Later signals were digitized television signal or multiplex of signals, typically QPSK. In general, digital television, including that transmitted via satellites, is based on open standards such as MPEG and DVB-S/DVB-S2 or ISDB-S. The conditional access encryption/scrambling methods include