A method of determining the data rate of signals received on a communication line is disclosed. The method analyzes the training signals which normally precede each data transmission to determine whether they contain a preselected pattern of phase reversals. The presence or absence of the pattern indicates...http://www.google.de/patents/US4663766?utm_source=gb-gplus-sharePatent US4663766 - Method of determining automatically the rate of data signals in a modem
