Sideband cancellation circuit for a transmission line communicat

Details Sideband cancellation circuit for a transmission line communicat Sideband cancellation circuit for a transmission line communicat

1978-12-04

1980-07-22

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

H04J 114

Patent

active

042141290

ABSTRACT:
A receiver in a transmission line communications system, such as a telephone system, receives a carrier signal having upper and lower sidebands. Typically, the carrier signal is modulated with message information signals and the upper sideband is modulated with signaling signals. A sideband cancellation circuit is utilized to cancel the lower sideband which is modulated with the unwanted signaling signals for the upper sideband of the next lower carrier signal in a multi-channel telephone system. The modulated carrier and sideband signals are split into two separate demodulation paths such that the unwanted information signals in each path are one hundred eighty degrees out of phase and the wanted information signals are in phase. The demodulated information signals from the two paths are summed to cancel the unwanted information signals from the lower sideband.

REFERENCES:
patent: 1773116 (1930-08-01), Potter
patent: 2248250 (1941-07-01), Peterson
patent: 2960573 (1960-11-01), Hodgson et al.
patent: 3082296 (1963-03-01), Caruthers
patent: 3611144 (1971-10-01), Harmon et al.

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