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Abstract

A device for processing an echographic signal S.sub.o (t), includes: a sampling device which supplies N discrete values C.sub.ok of S.sub.o (t) where k is 1, 2, . . . , N, p decomposition units (200j, j=1, 2, . . . , p), each comprising: a low frequency transmission channel including a low pass filter (201j) for correlation of the input signal S.sub.j-1 (t) with a sealing filter h(t), and a decimator (202j) which retain selective values with respect to k of the correlation, the N/2.sup.j values C.sub.jk, for k=1, 1+2.sup.j, 1+2.times.2.sup.j, . . . , representing s.sub.j (t), the low-frequency component of S.sub.o (t) of the order j, a high-frequency reducing channel which successively comprises a high-frequency filter (203j) for correlation of the input signal S.sub.j-1 (t) with a wavelet filter g(t), and a decimator (204j) which retains selective values with respect to k of the correlation, the N/2.sup.j values W.sub.jk for k=1, 1+2.sup.j, 1+2.times.2.sup.j, 1+3.times.2.sup.j, . . . , stored in a memory and representing D.sub.j (t) the high-frequency component of S.sub.o (t) of the order j, p cascade connected reconstruction units (400j), each comprising: a high-frequency enhancement channel which comprises a cirucit (401j) for comparing C'.sub.jk /W.sub.jk with a predetermined threshold, A.sub.j, C'.sub.jk representing the values of S'.sub.j (t), which outputs the N/2.sup.j values of W.sub.jk if C'.sub.jk /W.sub.jk

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