Device for transmitting data words representing a digitalized an

Details Device for transmitting data words representing a digitalized an Device for transmitting data words representing a digitalized an

1991-11-14

1992-09-08

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370118, H04J 312, H04J 1500

Patent

active

051464578

ABSTRACT:
A system for transmitting digitized analog information includes, for the purpose of transmitting an additional information signal apparatus for modifying the bit of low significance of every n-th data word representing the digitized information depending on the bits of an additional information signal. The apparatus for modifying is constructed in such a way that the modification depends both on the additional information signal and on other bits such as the most significant bit b7 of the data word which are not correlated with the bits of the additional information signal. This results in the intercorrelation between the errors in the data words introduced by the modification being reduced, so that a flatter power density error spectrum is obtained and the errors introduced in the data words by the modification are less conspicuous. A system for recovering the additional information signal from received modified data words includes similar apparatus for reversing the modification.

REFERENCES:
patent: 4079203 (1978-03-01), Dragoo
patent: 4354265 (1982-10-01), Nyberg et al.
patent: 4377860 (1983-03-01), Godbole
patent: 4476559 (1984-10-01), Brolin et al.
patent: 4581746 (1986-05-01), Arnold
patent: 4730312 (1988-03-01), Johnson et al.
patent: 4750173 (1988-06-01), Bluthgen
patent: 4901344 (1990-02-01), Monette et al.

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