Patent ID: 6078462
Filing Date: 2000-06-20
Classification: G11B

Abstract:
A device for processing servo signals and data for a reading apparatus that reads said servo signals and data from a magnetic storage medium, the device comprising:a variable-gain input amplifier coupled to said reading apparatus;a low-pass analog filter coupled to said amplifier;a transversal analog filter coupled to said low-pass filter;two distinct and parallel processing channels coupled between said transversal analog filter and a decoder that is structured to generate a read signal that includes said data, said processing channels comprising respective analog-to-digital converters followed by respective Viterbi detectors and operating according to sampling sequences that alternate with one another and according to sampling frequencies that are high enough to allow said analog-to-digital converters to process said data; anda demodulator circuit including an integrator circuit coupled to the outputs of said analog-to-digital converters, said demodulator circuit structured to asynchronously demodulate the servo signals, said integrator circuit structured to compute an integral of rectified servo signals and to generate a read-head-actuator-position signal for said reading apparatus in response to said servo signals.