Apparatus and method for digitally generating a modified duobina

Details Apparatus and method for digitally generating a modified duobina Apparatus and method for digitally generating a modified duobina

1975-10-17

1976-11-23

Griffin, Robert L.

Telegraphy

Systems

Printing

178 68, 340347DD, H03K 1324

Patent

active

039939537

ABSTRACT:
A binary signal is first digitally transformed to obtain both an altered binary signal and its complement. The altered and altered complementary signals are next each delayed by two bit intervals of the original waveform to obtain both delayed altered and delayed altered complementary signals in binary form. Then, the altered and delayed altered complementary signals are gated to obtain the first gated binary output signal wherein a second level output signal is obtained whenever the two input signals are both first level signals and the first gated signal is a first level signal for all other input combinations. The altered complementary and delayed altered signals are similarly gated to obtain a second gated output signal in binary form. Finally, the first and second gated output signals are compared to obtain a three-level digital modified duobinary signal.

REFERENCES:
patent: 3456199 (1969-07-01), Van Gerwen
patent: 3457510 (1969-07-01), Lender
patent: 3515991 (1970-06-01), Lender
patent: 3569955 (1971-03-01), Maniere
patent: 3601702 (1971-08-01), Lender
patent: 3679977 (1972-07-01), Howson
patent: 3866147 (1975-02-01), Couvreur et al.
patent: 3919476 (1975-11-01), Torpie
patent: 3920898 (1975-11-01), Torpie

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