Browse Prior Art Database

Signal Processing Circuit for Magnetic Data Recording

IP.com Disclosure Number: IPCOM000089382D
Original Publication Date: 1977-Oct-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Taub, DM: AUTHOR

Abstract

At high recording densities the peaks in the read waveform are displaced in position. A correction circuit is disclosed which gives an improved signal-to-noise ratio over existing circuits.

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Signal Processing Circuit for Magnetic Data Recording

At high recording densities the peaks in the read waveform are displaced in position. A correction circuit is disclosed which gives an improved signal-to-noise ratio over existing circuits.

As shown in the figure, an output signal from a disc file or tape unit V(in) is fed to the series-connected resistors R(1), R(2), R(3). The junction of R(1) and R(2) is connected to the input of a decay line. An output signal V(out) is generated by an amplifier with input terminals connected between the junction of R(2) and R(3) and a point two thirds of the way down the delay line. The resistors R(1), R(2), R(3) are selected to present the correct terminating impedance to the delay line. This circuit is an improvement over U.S. Patent 3,828,362, which shows an output taken from the far end of the delay line. For a particular case, this circuit was found to give about 40% improvement in signal- to-noise ratio as compared to the prior circuit, for the same degree of peak-shift correction.

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