Tri-level digital recording
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United States of America Patent
Stats
-
Jul 20, 1982
Issued Date -
N/A
app pub date -
Jan 15, 1981
filing date -
Dec 31, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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