Automatic baud rate detection

Details Automatic baud rate detection Automatic baud rate detection

1989-01-25

1991-04-16

Olms, Douglas W.

Pulse or digital communications

Repeaters

Testing

375121, 370 84, H04B 346

Patent

active

050089021

ABSTRACT:
Method for determining the baud rate of a data stream by comparison of captured data to known autobaud characters. Samples are received from the communication device and stored in memory until a set of the samples are accumulated. Then, a sample clock is divided in half and the odd numbered samples are compared to a set of known autobaud characters. If a match occurs, then the sample clock is assumed to be correctly synchronized with the incoming serial data stream. If a match does not occur, then the even samples are recirculated and eight more samples are collected. The sample clock is again divided in half and the odd numbered samples are compared to the set of known autobaud characters. If a match occurs, then the sample clock is assumed to be correctly synchronized with the incoming data stream. These steps are repeated until an autobaud character match is found or an error situation is determined.

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