Circuit arrangement for the elimination of interference signals in the received signal of a radio receiver, which originate from adjacent channels, by means of compensation of the interference signals

摘要

The circuit equalises a distorted, required signal received by a radio receiver. The circuit is formed by a structure with at least three parallel tracks (Pz,P1,2), starting from a common input for the distorted, required signal in the form of an oscillation mixture (Z5). The tracks are combined at a common output, coupled to a processor circuit of the receiver. Over the first track (Pz) the oscillation mixture passes unchanged to the output, while in the second track (P1) a filter unit (PLLF1) is provided followed by circuit stage (Q1) of the circuit portion (Q1,Mi1), effecting the frequency sheeting. The carrier frequency (f,d) and oscillations of the direct frequency adjacent signal are eliminated. For eliminating the carrier frequency (g,c) of the following signal, the third track (P2) contains another filter unit (PLLF2), followed by another circuit portion (Mi1,Q2) for the frequency shift.