Patent ID: 8953875
Filing Date: 2015-02-10
Classification: G06K

Abstract:
1. A digital filter bank having a number J of stages, where J is an integer greater than one, wherein for each integer j such that 1≦j≦J, the j-th stage comprises: a plurality of filtering units each receiving an input signal of the j-th stage, including a low-pass filtering unit and at least one band-pass filtering unit using complex filtering coefficients; and following each band-pass filtering unit of the j-th stage, a respective modulus processing unit for generating a processed real signal as a function of squared moduli of complex output values of said band-pass filtering unit, wherein the input signal of the first stage is a digital signal supplied to the digital filter bank, and wherein for 1<j≦J, the input signal of the j-th stage includes the processed real signal generated by at least one modulus processing unit of the (j−1)-th stage.