PSK Modulation in AC bias data recording

Details PSK Modulation in AC bias data recording PSK Modulation in AC bias data recording

1981-11-30

1983-12-13

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Pulse crowding correction

360 51, G11B 509

Patent

active

044207760

ABSTRACT:
In a data recording system employing an AC bias signal that is superimposed on the data signal, the AC bias signal is phase modulated to compensate for the difference in the phase angle between the alternating bias and the data signals. The frequency of the AC bias signal is no greater than ten times the frequency of the data signal.

REFERENCES:
patent: 3798673 (1974-03-01), Koinuma
patent: 4055814 (1977-10-01), Abraham et al.
patent: 4202017 (1980-05-01), Geffon et al.
patent: 4367496 (1983-01-01), Lesieur

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