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.
Claims27
A finite impulse response (FIR) filter for implementing a Hilbert transform, the FIR filter comprising:
- 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 having associated therewith a constant filter coefficient and a programmable delay coefficient.
A decoding circuit for a magnetic storage medium comprising:
- an amplifier having an input for receiving a data signal from the magnetic storage medium;
- and
- a finite impulse response (FIR) filter connected to said amplifier for implementing a Hilbert transform on the data signal, said FIR filter comprising
- a plurality of programmable delay cells connected in cascade between an input terminal of said FIR filter and an output terminal of said FIR filter, each programmable delay cell having associated therewith a constant filter coefficient and a programmable delay coefficient.
A magnetic recording device comprising:
- a magnetic storage medium;
- and
- a decoding circuit connected to said magnetic storage medium, said decoding circuit comprising
- an amplifier having an input for receiving a data signal from said magnetic storage medium, and
- a finite impulse response (FIR) filter connected to said amplifier for implementing a Hilbert transform on the data signal, said FIR filter comprising
- a plurality of programmable delay cells connected in cascade between an input terminal of said FIR filter and an output terminal of said FIR filter, each programmable delay cell having associated therewith a constant filter coefficient and a programmable delay coefficient.
A method of filtering a signal having a spectrum that is unknown a priori, the method comprising:
- performing a Hilbert transform on the signal using a finite impulse response (FIR) filter that comprises 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 having associated therewith a constant filter coefficient and a programmable delay coefficient.
A method of decoding a data signal from a magnetic storage medium comprising:
- amplifying the data signal from the magnetic storage medium;
- and
- performing a Hilbert transform on the data signal using a finite impulse response (FIR) filter that comprises 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 having associated therewith a constant filter coefficient and a programmable delay coefficient.
Dependencies are inferred from the claim text.