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Browse Prior Art Database

Window-Shifting Mechanism in Data Separator

IP.com Disclosure Number: IPCOM000040369D
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02

Publishing Venue

IBM

Related People

Authors:
Cunningham, EA Kerwin, GJ Palmer, DC Rae, JR [+details]

Abstract

The mechanism effectively shifts the window in which a bit is read from a disk file by its head so as to assure that the bit is correctly read. The mechanism consists of means which utilizes a method of rapidly establishing a new definition of the window center provided by the VFO (variable frequency oscillator) controlling the position of the window with respect to disk rotation in which a certain bit is read and the method of employing this window-skewing action for error recovery. The block diagram is a representation of a window-skewing scheme implemented in the VFO of a typical disk reading system. The control bits determine the amount and direction of timing window shift, as shown in Table 1.