Simultaneous transmission of two information signals within a band-limited communications channel
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United States of America Patent
Stats
-
Jan 10, 1984
Grant Date -
N/A
app pub date -
Jan 8, 1982
filing date -
Jan 8, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A co-channel communications system is disclosed which permits a digital data signal to be simultaneously transmitted with a communications medium signal such as telephone voice or television video. The data signal or signals are converted into very low multifrequency signals consisting of fundamental frequencies and harmonics which span the communications bandwidth. Because a number of frequencies are used for each data signal, the signal level of the data signals can be greatly suppressed relative to the communications medium signal to a level such that there is no perceptible degradation of the telephone voice or television video. Synchronous detectors for each frequency transmitted, including harmonic frequencies, are utilized to recapture and regenerate the data signals transmitted.
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Cited Art Landscape
Patent Citation Ranking
- 419 Citation Count
- H04J Class
- 0 % this patent is cited more than
- 41 Age