Channel filter

Details Channel filter Channel filter

1987-02-03

1988-07-05

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Pulse crowding correction

G11B 509

Patent

active

047558903

ABSTRACT:
A channel filter employing time domain targeting techniques to eliminate inter symbol interference in the reading of information from magnetic media. A pulse detector outputs a signal characteristic of polarity reversals on the surface of magnetic storage media. This output signal is coupled to a tapped delay line network and a moderate order L-C network. The tapped delay line provides an output signal to the L-C network, which flattens out pre-cursive and post-cursive undershoots. As a result, a moderate order L-C network is sufficient to approximate the desired target response so that maximum information density can be achieved. The tapped delay line provides an output signal that consists of a superposition (sum) of the input signal delayed and weighted. This forms a transversal filter. As with any linear filter, reciprocity applies. Consequently, the output of the tapped delay line is taken from the input with AC coupling directly to ground. The output is taken from a low characteristic impedence, eliminating the need for an internal amplifier capable of driving a low impedence equal to the characteristic impedence of the delay line.

REFERENCES:
patent: 4264935 (1981-04-01), Lee

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