METHOD AND DEVICE FOR EQUALIZING NONLINEAR PREDISTORTIONS OF SECAM COLOR-DIFFERENCE SIGNALS Russian patent published in 2003 - IPC

FIELD: color television. SUBSTANCE: method involves finding time interval Δt₁ corresponding to length of amplitude-limited spike in color- difference signal by comparing value of the latter with desired voltage value; delay of color-difference signal for time τ₁, exceeding maximal possible value of Δt₁; shaping of equalizing pulse amplitude by accumulation of auxiliary voltage for time Δt₁; storage of amplitude value obtained for time Δt₂ = τ₁-Δt₁; generation of equalizing pulse for time Δt₃ equal to Δt₁; addition of delayed color-difference signal with generated equalizing signal; equalization of low-frequency predistortions in signal obtained; delay of color-difference signal for time τ₂ exceeding minimal length of its leading edge; inversion; addition with desired voltage value; storage of value obtained for time longer than Δt₃; and multiplication of equalizing pulse by value obtained to produce equalizing signal. Proposed method and device may be used for SECAM decoders of color television sets and picture monitors with pictures received over SECAM system in transitions of saturated colors including equalization of demodulated SECAM signal. EFFECT: enhanced color definition of picture. 4 cl, 21 dwg