Coding method and apparatus using quaternary codes

Details Coding method and apparatus using quaternary codes Coding method and apparatus using quaternary codes

1992-11-16

1994-07-19

Hoff, Marc S.

Coded data generation or conversion

Digital code to digital code converters

To or from multi-level codes

341 58, H03M 706

Patent

active

053313208

ABSTRACT:
In digital data transmission and storage, binary data strings are encoded into symbols from a quaternary alphabet by a specific inventive use of finite-state machines. The novel, high-rate quaternary codes offer spectral shaping properties together with a significant increase in noise margin when used on channels which lend themselves to partial-response shaping. In principle, the encoding occurs in three steps: a u-state transition diagram generates quaternary symbols whose running digital sum assumes values from a given set; the u-state transition diagram is converted into a v-state machine, each of the v states being associated with a number of transitions sufficient to encode the input data bytes into output code words; finally, the v-state machine is switched into a next state depending on its current state and the last encoded input data byte.

REFERENCES:
patent: 3518662 (1970-06-01), Nakagome et al.
patent: 4408189 (1983-10-01), Betts et al.
patent: 4528550 (1985-07-01), Graves et al.
patent: 5173926 (1992-12-01), Iwasaki

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