FIELD: spurious- image suppressing systems. SUBSTANCE: device has infinite-duration impulse-response (IIF) filter for suppressing spurious images and channel modeling circuit for generating weight coefficients on its taps to program spurious-image suppressing IIR filter. Channel modeling circuit has means for calculating total value of all generated weight coefficients. If total value is higher than preset value, which points to instability of IIR filter, weight coefficients are adequately scaled to reduce this total value thereby reducing probability of filter instability. EFFECT: improved stability. 9 cl, 4 dwg
