Tri-level digital recording

Details Tri-level digital recording Tri-level digital recording

1981-01-15

1982-07-20

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

360 46, G11B 509

Patent

active

043409130

ABSTRACT:
A method and apparatus are disclosed for recording digital data on magnetic tape with an audio recorder. A logic circuit receives the data to be recorded and outputs two sequences of high and low levels: one sequence directly corresponds to the data and the other inversely corresponds to the data. One sequence is first inverted with respect to the other and the two sequences are then combined and recorded. After a data sequence, the two logic circuit outputs are placed at the same level, and the subsequent inversion of one output level relative to the other causes the combined levels to reach an intermediate, third level.

REFERENCES:
patent: 2954267 (1960-09-01), Canepa
patent: 4067050 (1978-01-01), Munninghoff
patent: 4202016 (1980-05-01), Sampey

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