Device for transmitting data words representing a digitalized analog signal and device for receiving the transmitted data words
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United States of America Patent
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Sep 8, 1992
Issued Date -
N/A
app pub date -
Nov 14, 1991
filing date -
Sep 16, 1988
priority date (Note) -
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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.
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