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Digital Magnetic Recording Reading Channel Using Statistical Decisions for Data Detection

IP.com Disclosure Number: IPCOM000078035D
Original Publication Date: 1972-Jul-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Sierra, HM: AUTHOR

Abstract

A binary data-detection system employing saturation magnetic recording includes two channels 10 and 12, to provide early separation of clock and data during readout. A read head 14 senses the recorded signal, which is passed through preamplifier 16 and rectifier 18 to provide an analog data signal.

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Digital Magnetic Recording Reading Channel Using Statistical Decisions for Data Detection

A binary data-detection system employing saturation magnetic recording includes two channels 10 and 12, to provide early separation of clock and data during readout. A read head 14 senses the recorded signal, which is passed through preamplifier 16 and rectifier 18 to provide an analog data signal.

In the clock channel 12, a phase-locked loop 20 separates the clock from the data. In the data channel 10, a data standardizer 22 relocates data pulses to assigned time slots defined by a variable-frequency oscillator. The standardized data is integrated in block 24 in response to a sample pulse generator 26, and the integrated signal is compared in circuit 28 to dual-threshold voltage levels, in order to determine whether the bit signal is a binary one, binary zero, or "indeterminate". The latter decision is made if the bit signal falls between the two threshold levels. If so, then an erasure corrector 30 provides corrections after inspection of several bits, and an error-correction code 32 is employed to take care of remaining errors.

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