Patent ID: 8019034
Filing Date: 2011-09-13
Classification: G11B,H03L

Abstract:
1. For multiple read channels configured to read received signals, wherein signal clocking of said received signals are correlated, a common sample timing control, comprising: multiple phase inputs, each indicating the phase of at least one digital sample taken with respect to one of a plurality of read channels, said read channels configured to provide digital samples of said correlated signals; multiple phase error inputs, each indicating phase error of one of said read channels; logic responsive to said multiple phase error inputs configured to weight said phase error indication of each said phase error input with a weighting related to a characteristic of said weighted phase error indications for said phase error input being weighted, and crosscouple said weighted phase error indication of each said phase error input with said phase error indication of each other said phase error input, and to apply common gain to said crosscoupled weighted phase error indications; wherein said weight for each said phase error input is related to a noise variance of said phase error indications for said phase error input being weighted; wherein said common gain is related to the ratio of the noise variance associated with frequency error variations to the noise variance associated with said phase error indications for all channels; and feedback logic responsive to said crosscoupling and configured to provide a sample timing phase estimate for each said read channel.