Over speed data rate adjustment method and apparatus in an async

Details Over speed data rate adjustment method and apparatus in an async Over speed data rate adjustment method and apparatus in an async

1990-03-15

1991-06-25

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

370 49, 375118, 375122, H04L 2539

Patent

active

050273817

ABSTRACT:
An improved process handles asynchronous data in which certain stop bits have been deleted or extra stop bits added to accommodate speed differences between a data source and the asynchronous data stream rate. A second asynchronous data stream is generated based upon said first data stream. Upon detecting a missing stop bit, a shortened stop bit is generated in the second data stream and a predetermined number of subsequent stop bits are also shortened to achieve synchronization with the first data stream. In a preferred embodiment, the receipt of an extra stop bit in the first data stream while shortened stop bits are being generated results in the extra stop bit not being generated in the second data stream and a corresponding flag set. If another missing stop bit occurs while shortened stop bits are being generated and if the flag is set, a shortened stop bit is inserted and the flag is reset.

REFERENCES:
patent: 4937839 (1990-06-01), Motley et al.
CCITT Recommendation, vol. 14, pp. 45-48, Melbourne 1988.

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