H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/33, 325/9
H04N 7/12 (2006.01) H04B 1/66 (2006.01) H04N 7/20 (2006.01)
Patent
CA 1159142
17 47,406 ABSTRACT OF THE DISCLOSURE A system for reducing the bandwidth and simul- taneously transmitting a plurality of signals through a common transponder is disclosed. The system is particu- larly 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 transmis- sion 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 as the original signal.
345015
Oldham And Company
Westinghouse Electric Corporation
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