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Abstract

A rob bit compensation system improves the accuracy of digital signals transmitted to a digital network, such as a telephone network, that employs rob bit signaling (RBS) wherein the network periodically robs a bit for its own use. The rob bit compensation system can be employed within the transmit subsystem of a digital modem connected with the digital network that periodically robs a bit every nth frame, where n is, for example, 6, 12, or 24. The system may also be employed in association with the communications path within a coder/decoder (codec) that transmits data to the digital network. A feedback system advises the rob bit compensation system as to which frames of outgoing digital data are to have a bit robbed therefrom by the digital network. The feedback system causes a quantity to be mathematically combined with the digital data corresponding with each RBS frame in order to enhance accuracy of the RBS frames. As an example, one-half of an LSB may be added to the digital data corresponding with each RBS frame when the certain logic state is a mark (logical 1), or alternatively, one-half of an LSB may be subtracted from (i.e., add 2's complement) the digital data corresponding with the RBS frame when the certain logic state is a space (logical 0).

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