Cascade transversal-filter phase-compensation network

Claim 1

A phase-compensation network, capable of modifying the phase response of a filter or network while leaving unchanged the amplitude response, comprising: a cascaded combination of simple transversal filters, each comprising: a delay line; at least one tapped weighted element whose input is connected to the delay line; the elements of each simple transversal filter corresponding to the values of the Bessel function of fixed argument and for successive integral indices of the order, including the zeroth order, only significant values of positive and negative indices of the order being used, the element corresponding to the zeroth order being in the center of its specific transversal filter, the elements corresponding to orders plus 1 and minus 1, plus 2 and minus 2, and higher orders with their negatives, being symmetrically disposed about the central element, the polarity of two symmetrically disposed elements being the same if the index of the order is even, and unlike if the order is odd; and a signal summer whose input is connected to the outputs of the weighted elements; and wherein the output of one transversal filter constitutes the input to the next succeeding filter in the cascade, each transversal filter corresponding to one of a set of fixed arguments of a Bessel function of the first kind, the set of fixed arguments being obtained from the coefficients of phase function when expressed in Fourier series form.