Methods for multi-channel data detection phase locked loop frequency error combination
AssigneeInternational Business Machines Corporation
InventorsRobert Allen Hutchins, Jens Jelitto, Sedat Oelcer
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Abstract
Frequency error combination for a multi-channel data detection system with a phase locked loop for each channel, comprises receiving frequency error information of a signal relevant to a phase locked loop with respect to each channel; combining the received error signal information and generating a combined error signal, weighting the received error signal information from each channel, for example with reliability information. The combined frequency error signal is applied to at least one channel phase locked loop.
Claims9
A method for generating frequency error for at least one channel phase locked loop of a multi-channel data detection system, said multi-channel data detection system comprising a phase locked loop for each channel, comprising the steps of:
- receiving frequency error information with respect to each said channel;
- combining said received frequency error information and generating a combined frequency error, weighting said received frequency error information from each said channel wherein each weight comprises a fraction wherein the total of said weight fractions is equal to “1”;
- and
- applying said combined frequency error to at least one said channel phase locked loop.
A method for generating frequency error signal for at least one channel phase locked loop of a multi-channel data detection system, said multi-channel data detection system comprising a phase locked loop for each channel, comprising the steps of:
- receiving frequency error information with respect to each channel, said channel configured to derive information with respect to readback signals of a track of a multi-track head;
- combining said received frequency error information and generating a combined frequency error, weighting said received frequency error information from each said channel wherein the total of said weight fractions is equal to “1”;
- and
- applying said combined frequency error to at least one said channel phase locked loop.
A method for generating frequency error for at least one channel phase locked loop of a multi-channel data detection system, said multi-channel data detection system comprising a phase locked loop for each channel, comprising the steps of:
- receiving frequency error information with respect to each said channel;
- combining said received frequency error information and generating a combined frequency error, weighting said received frequency error information from each said channel wherein said weighting is based on signal to noise ratio (SNR) information of the channel form which said frequency error information is received;
- and
- applying said combined frequency error to at least one said channel phase locked loop.
Dependencies are inferred from the claim text.