Data detection employing high-speed baseline tracking compensati

Details Data detection employing high-speed baseline tracking compensati Data detection employing high-speed baseline tracking compensati

1990-06-11

1992-03-31

Canney, Vincent P.

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

360 46, G11B 509

Patent

active

051013959

ABSTRACT:
A data detection circuit employing either amplitude or transition location techniques to adjust a detection threshold for following shifts in baseline of the signal being detected. In the amplitude version, the midway amplitude value between a detected succession of positive and negative peaks adjusts the detection threshold such that threshold adjustment occurs in one detection period and is used in the immediately-following detection period. In the transition-position detection, the relative location in time of successive transitions, represented by samples of the transition of a read signal, are integrated and averaged for providing detection which tracks baseline shifts. In all cases, shifting of detection threshold is always immediately adjacent the usage of a detection threshold which continually follows a shifting DC baseline of the input signal. A tracking detection threshold follows baseline shift of a distorted read signal detects zero axis crossing of the analog signal for generating a NRZI digital waveform.

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patent: 4445111 (1984-04-01), Swift et al.
patent: 4475183 (1984-10-01), Marchant et al.
patent: 4646281 (1987-02-01), Verboom

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