Frequency cancelling system and method

Details Frequency cancelling system and method Frequency cancelling system and method

1996-09-18

1999-10-26

Vo, Nguyen

Telecommunications

Transmitter and receiver at separate stations

Distortion, noise, or other interference prevention,...

455304, H04B 1500

Patent

active

059743018

ABSTRACT:
A frequency cancelling system is disclosed which improves reception of a communication signal which is transmitted at a communication frequency in the presence of an interference signal which occurs at the same communication frequency. The frequency cancelling system generates a reference signal at the communication frequency, and adjusts the reference signal to be opposite in phase and equal in amplitude to the interference signal. The reference signal and the communication signal are then combined to cancel the interference signal. In a preferred embodiment, the reference signal is generated from the same source as that from which the interference signal arises. Preferably, the interference signal is received during an interval in which the communication signal is not being transmitted, and the reference signal is adjusted to be opposite in phase and equal in amplitude to the interference signal during that interval.

REFERENCES:
patent: 3757235 (1973-09-01), McCormick
patent: 4268793 (1981-05-01), Amazawa et al.
patent: 4272846 (1981-06-01), Muratani et al.
patent: 4300020 (1981-11-01), Toyomaki
patent: 4317217 (1982-02-01), Davidson et al.
patent: 4459474 (1984-07-01), Walton
patent: 4989262 (1991-01-01), Saito
patent: 5105435 (1992-04-01), Stilwell
patent: 5109532 (1992-04-01), Petrovic et al.
patent: 5109533 (1992-04-01), Mine et al.
patent: 5140699 (1992-08-01), Kozak
patent: 5251328 (1993-10-01), Shaw
patent: 5325394 (1994-06-01), Bruckert
patent: 5361400 (1994-11-01), Kazecki et al.
patent: 5369791 (1994-11-01), Asghar et al.
patent: 5406133 (1995-04-01), Watanabe et al.
patent: 5428831 (1995-06-01), Monzello et al.
patent: 5548838 (1996-08-01), Talwar et al.

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