Methods and apparatus for performing interpolated timing...

Details Methods and apparatus for performing interpolated timing... Methods and apparatus for performing interpolated timing...

2008-11-25

2011-11-01

Negron, Daniell L (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

C360S065000

Reexamination Certificate

active

08049983

ABSTRACT:
Methods and apparatus are provided for performing interpolated timing recovery using a frequency and phase estimate. An analog signal representing a sector is asynchronously sampled and stored in a storage device. A retiming circuit reads the stored samples and, based on first portions of first and second timing portions of the sector, determines phase adjustments. The retiming circuit generates a signal representing the samples at the adjusted phase and determines sample shift adjustments based on the generated signal and second portions of the first and second timing portions. The retiming circuit computes start and end indices of the sector in the buffer based on the sample shift adjustment and phase adjustment. The start and end indices may be used to compute a frequency estimate. The frequency estimate and a phase adjustment is used to interpolate the asynchronous samples at the appropriate frequency and phase.

REFERENCES:
patent: 5901010 (1999-05-01), Glover et al.
patent: 6009549 (1999-12-01), Bliss et al.

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