| 摘要 |
Data processing methods and apparatus embodying an improved version of a gradiometer transform of the type disclosed in EP-A-0849565, which provides a method of extracting a signal from noisy data, comprising generating a plurality of components of a gradiometer transform by correlating a normalised data-set with a plurality of gradiometer step functions of differing orders, to obtain a transform vector F, and wherein an N<th> order fit to the data is obtained from data APPROX d0 + d1T1(t) + D2T2(t) + ... DnTn(t) -1 </= t </= 1 where T0, T1, T2, ..., TN are Chebychev polynomials of the first kind and the coefficients d0, d1, d2, ..., dN are obtained from the matrix equation (A) and where JT(N) is the (N+1)x(N+1) submatrix of a generic matrix JT. |
