Arrangement for suppressing spurious signals occurring in the re

Details Arrangement for suppressing spurious signals occurring in the re Arrangement for suppressing spurious signals occurring in the re

1993-01-21

1995-06-27

Urban, Edward F.

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

455306, H04B 110

Patent

active

054288339

ABSTRACT:
In an arrangement for suppressing spurious signals occurring in a reception signal in a receiver of a high-frequency message transmission system, these spurious signals resulting from at least one neighboring channel that neighbors the useful signal channel, the reception signal is distributed onto at least two branches. One of the branches has a summing element as well as a circuit for generating a signal with a frequency, phase and amplitude corresponding to the useful signal. The other branch also has a summing element as well as a circuit for generating a signal having a frequency, phase and amplitude corresponding to the spurious signal. The signals of these branches are respectively supplied anti-phase to the summing element of the respective other branch. In addition, an evaluation and control circuit is allocated to the branches, the momentary frequency, phase and amplitude of the useful or spurious signal allocated to the respective branch being measured and evaluated therewith and with which the frequency, phase and amplitude of the signal generated in the respective branch is correspondingly set dependent on these measured and evaluation values.

REFERENCES:
patent: 3876943 (1975-04-01), Watt et al.
patent: 4723303 (1988-02-01), Koch
patent: 5075697 (1991-12-01), Koizumi et al.
patent: 5263191 (1993-11-01), Dickerson
patent: 5307517 (1994-04-01), Rich
"Use of Interference Cancellers in Order to Increase Spectrum Usage" Recommendations & Reports of the CCIR, vol. 1, Spectrum Utilization & Monitoring, Dubrovnik, 1986, pp. 63-79, particularly FIG. 3.

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