Abstract: Coder-decoder of television pictures for transmission and/or reception via digital low-speed channel. In transmission, it first carries out the bidimensional transform of digital sample blocks of the television signal and then a dichotomic quantization thus obtaining quantized coefficients with variable length as a function of the coefficient index; in reception, it first carries out a quantization for quantized coefficients re-assignment of suitable quantization levels, and then the bidimensional antitransform for obtaining again the digital television signal samples. An optimized configuration of digital sample memory in transmission and in reception is shown in FIG. 1.

Abstract: An adaptive equalizer for high-speed binary signals, operating in baseband, comprises a transversal filter receiving digitized samples of incoming symbols and feeding them to a decision stage. An error signal derived from the difference between the filtered and the decided samples, for each coefficient of the transversal filter and for each iteration of the processing by that coefficient, is fed to an updating unit, where its sign is compared with the sign of the corresponding filtered sample to determine their identity or disparity. The result is a binary discriminating signal sent to a coefficient calculator and to a threshold generator which receives from that calculator the current coefficient and, dependent on the polarity of that coefficient and on the logical value of the discriminating signal, produces a threshold value to be compared with the absolute magnitude of the error signal.