Data transmission systems

Details Data transmission systems Data transmission systems

1976-10-08

1978-01-31

Robinson, Thomas A.

Telegraphy

Systems

Chemical

178 691, 325 38A, H04L 1500, H04B 104

Patent

active

040716929

ABSTRACT:
Intelligence is conveyed in a PCM bit stream form with alternate bits being inverted. Additional information is conveyed by violations of the alternate bit rule so that two successive bits have the same polarity. Prior to being coupled to the alternate mark inversion coder a pseudo-random bit stream is mixed by binary addition without carry to the intelligence bit stream to maintain low DC level in the transmitted mixed bit stream and to maintain bit transitions relatively high.

REFERENCES:
patent: 3303424 (1967-02-01), Hopner et al.
patent: 3502810 (1970-03-01), Aaron et al.
patent: 3713025 (1973-01-01), McNair
patent: 3783383 (1974-01-01), Forster et al.

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