US 12,254,899 B1
Digital timing recovery in hard disk drive read channel for preamble reduction
Nitin Nangare, Sunnyvale, CA (US); and William J. Mitchem, Broomfield, CO (US)
Assigned to Marvell Asia Pte Ltd, Singapore (SG)
Filed by Marvell Asia Pte Ltd, Singapore (SG)
Filed on Feb. 23, 2024, as Appl. No. 18/585,362.
Claims priority of provisional application 63/451,204, filed on Mar. 9, 2023.
Claims priority of provisional application 63/449,933, filed on Mar. 3, 2023.
Int. Cl. G11B 20/10 (2006.01)
CPC G11B 20/10222 (2013.01) [G11B 20/10046 (2013.01); G11B 20/10268 (2013.01)] 37 Claims
OG exemplary drawing
 
1. A method of reading data from a rotating magnetic storage medium having at least one read head, the method comprising:
storing respective digitized data samples from each respective read head of the at least one read head in a respective timing buffer;
determining a zero-phase start phase angle from a preamble of the digitized data samples;
feeding forward the zero-phase start phase angle to an interpolator;
selecting an interpolation filter based on the fed-forward zero-phase start phase angle;
releasing the respective digitized data from the respective timing buffer after a duration sufficient for completion of the determining, the feeding forward and the selecting; and
interpolating samples of the digitized data released from the respective timing buffer.