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. The ground-roll is a type of noise normally present in land seismic data. It strongly harms the signal-to-noise ratio, and interferes in several stages of the seismic data processing, strongly affecting the final quality of the obtained seismic images. For the attenuation of the ground-roll we propose an adaptive filtering method that uses binomials filters obtained from the convolution of pairs of dipoles (1, c) and (c,−1). The coefficient c corresponds to the first coefficient of the prediction error operator, obtained through the Burg algorithm. This filtering method allows for the decomposition of signals in frequency bands, from the lowest frequency band to the highest band. The method is applied in adaptive form, in sliding windows of time, adapting themselves to the variations in the frequency content of the data. Its implementation and use in seismic data processing is relatively simple and computationally efficient. Keywords: seismic noise, signal-to-noise ratio, adaptive filters, Burg algorithm, seismic signal decomposition. RESUMO. O ground-roll e um tipo de ruido normalmente presente nos dados sismicos terrestres. Ele prejudica muito a razao sinal-ruido e interfere em varios estagios do processamento de dados sismicos, afetando fortemente a qualidade final das imagens sismicas obtidas. Para atenuacao desse ruido, propomos um metodo de filtragem adaptativa que utiliza filtros binomiais construidos a partir da convolucao de pares de dipolos (1, c) e (c,−1). O coeficiente c corresponde ao primeiro coeficiente do operador de erro de predicao e e obtido atraves do algoritmo de Burg. Este metodo de filtragem adaptativa permite a decomposicao de sinais em bandas de frequencia, desde a banda de mais baixa frequencia ate a de mais alta. O metodo e aplicado na forma adaptativa, utilizando janelas deslizantes de tempo, adaptando-se as variacoes do conteudo de frequencia dos dados ao longo do registro sismico. Sua implementacao e uso, no processamento de dados sismicos, e relativamente simples e computacionalmente eficiente. Palavras-chave: ruidos sismicos, relacao sinal-ruido, filtragem adaptativa, algoritmo de Burg, decomposicao do sinal sismico.

ADAPTIVE SIGNAL DECOMPOSITION AND FILTERING USING BINOMIAL FILTERS APPLIED TO THE GROUND-ROLL ATTENUATION