Time continuous FIR filter to implement a hilbert transform and corresponding filtering method
AssigneeSTMicroelectronics S.r.l.
InventorsValerio Pisati, Augusto Rossi, Giorgio Betti, Marco Cazzaniga
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Abstract
A finite impulse response (FIR) filter for implementing a Hilbert transform is provided. The FIR filter includes a plurality of programmable delay cells connected in cascade between an input terminal of the FIR filter and an output terminal of the FIR filter. Each programmable delay cell has associated therewith a constant filter coefficient and a programmable delay coefficient. The FIR filter is also applicable for processing signals originated by the reading of data from a magnetic storage media which employs perpendicular recording.
Claims9
A time-continue FIR (Finite Impulse Response) filter structure for implementing a Hilbert transform, of the type including a cascade of delay cells connected between an input terminal of the filter and an output terminal, characterized by having constant filter coefficients (c0, . . . ,cn) and a programmable time delay (Td) of the programmable filter cells.
A method of filtering signals whose spectra are unknown a priori, of the type comprising the sequential steps of processing the signal through amplification, low-pass filtering, analog-to-digital conversion, and equalization, characterized in that a step of processing the signal through a Hilbert FIR filter is carried out between the amplifying and low-pass filtering steps.
Dependencies are inferred from the claim text.