Data recovery system particularly for systems utilizing partial response maximum likelihood detection

摘要

A data recovery system wherein the data is represented by a sequence of preamble pulses having a predetermined sequence followed by data pulses. An analog to digital converter converts samples of the preamble pulses and the data pulses into corresponding digital words in response to clock pulses fed to a clock input of the converter. A pair of feedback loops is coupled to an output of the analog to digital converter to produce the clock pulses for the converter; a first one during a data recovery mode and a second one during a preceding preamble acquisition mode.