Device for processing servo signals in a parallel architecture PRML reading apparatus for hard disks.

摘要

The device is to be used with a parallel architecture PRML reading apparatus comprising a variable-gain input amplifier (21), a low-pass analog filter (22), a transversal analog filter (23) and two distinct and parallel processing channels (24, 34) interposed between the transversal analog filter (23) and an RLL-NRZ decoder (25). The two processing channels (24, 34) comprise respective analog-digital converters (26, 36) and respective Viterbi detectors (27, 37) and operate according to sampling sequences that alternate with one another. The device (30) for processing the servo signals comprises a rectifier (31) connected to the outputs of said analog-digital converters (26, 36) and an integrator (32). <IMAGE>