Method and apparatus for code conversion of binary to multilevel

Details Method and apparatus for code conversion of binary to multilevel Method and apparatus for code conversion of binary to multilevel

1981-05-18

1983-10-04

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

375 17, 375 19, 375 20, H03K 1324

Patent

active

044081898

ABSTRACT:
A method and apparatus for converting a binary signal to one having quaternary-level symbols with no d-c component. To achieve this, the running digital sum is limited by selectively inverting words within each frame of (n) symbols. A separate (n+1)th symbol is added to each frame to indicate the selective inversion of the words, so that the correct polarity of the (n) symbols can be re-established.

REFERENCES:
patent: 3457510 (1969-07-01), Lender
patent: 3753113 (1973-08-01), Maruta et al.
patent: 3754237 (1973-08-01), de Laage de Meux
patent: 3760277 (1973-09-01), Whang
patent: 3828346 (1974-08-01), Forster et al.

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