Dynamic magnetic information storage or retrieval – General processing of a digital signal – Pulse crowding correction
Patent
1980-10-24
1982-08-10
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Pulse crowding correction
360 67, G11B 509, G11B 502
Patent
active
043440932
ABSTRACT:
A pulse improvement circuit for a magnetic readback system produces a data representative signal having symmetrical, equal-amplitude pulses of limited time widths. The circuit includes an equalizer made in accordance to a final transfer function produced as a result of a mathematical convolution of first and second transfer functions. The first transfer function is based on the theory of a matched filter for receiving a signal having data representative and non-white noise pulses contained therein to produce a filter signal having maximum signal to noise ratio. The second transfer function is based on the theory of a Papoulis window function for slimming the pulses contained in the filter signal. A specific circuit implementation of the final transfer function is an eight-pole, inductor-capacitor, ladder network for amplitude equalization coupled to an inductor-capacitor, lattice network including first and second order sections for phase equalization.
REFERENCES:
patent: 4264935 (1981-04-01), Lee
patent: 4276573 (1981-06-01), Halpern et al.
Battjer Eugene T.
Canney Vincent P.
Sperry Corporation
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