Transmission system for TV signals

摘要

A system for reducing the bandwidth and simultaneously transmitting a plurality of signals through a common transponder. The system is particularly useful for the transmissions of multiple TV signals via a geostationary satellite. Prior to transmission the bandwidth of each of the signals to be transmitted is reduced by one half by deleting every other line and expanding each of the remaining lines to cover a time interval normally occupied by two lines. After transmission through the satellite, each of lines is recorded at a first rate and read back at a higher rate to reduce the time interval of each line to its original value. Each line is repeated twice to reconstruct a TV signal having the same format at the original signal.