Rob bit compensation system and method associated with a receive

Details Rob bit compensation system and method associated with a receive Rob bit compensation system and method associated with a receive

1996-08-23

1998-06-02

Bocure, Tesfaldet

Pulse or digital communications

Receivers

370523, 375346, H04L 2700

Patent

active

057612471

ABSTRACT:
A rob bit compensation system improves the accuracy of digital signals received from and 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 system can be employed within a digital modem or a coder/decoder (codec), each of which is interconnected with the digital network that periodically robs a bit every nth frame, where n is, for example, 6 or 24. The system can be implemented in association with the receive subsystem of the digital modem or in the communications paths within the codec associated with receiving data from the digital network. The system includes a compensation control utilized to detect when a least significant bit (LSB) of a particular frame of data consistently exhibits a certain logic state, either a mark (logical 1) or a space (logical 0). When an LSB of a particular frame does consistently exhibit the certain logic state, then the particular frame is considered an RBS frame. Furthermore, the compensation control causes a quantity (e.g., one-half of an LSB) to be mathematically combined (added or subtracted, whichever is appropriate) with the data corresponding with the RBS frame via a set of adders in order to enhance accuracy of the RBS frame.

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Method and Apparatus Compensating for Effects of Digital Loss Insertion In Signal Transmissions Between Modems, Application Ser. No. 08/390,185; Filed Feb. 17, 1995.

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