High density ced data storage

Details High density ced data storage High density ced data storage

1992-06-08

1994-02-08

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Electrical modification or sensing of storage medium

369132, G11B 906

Patent

active

052854396

ABSTRACT:
M-ary angle modulation is used to record digital data at high density on a disk. In one embodiment, data symbols are encoded by assigning each data symbol a phase representation in terms of a carrier signal, the disk is physically altered in such a manner as to represent the carrier signal, and, at defined intervals, a phase angle of the carrier signal is changed by one of M of possible phase increments, where M equals two to the power of a number of data bits in a data symbol. M data bits are therefore recorded per each of the defined intervals. In another embodiment, a frequency of the carrier signal is changed to have one of M possible frequencies.

REFERENCES:
patent: 4516232 (1985-05-01), Van Raalte et al.

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