Liberman Richard A: Timing recovery circuit with two speed phase correction. International Business Machines Corporation, June 15, 1971: US3585298 (25 worldwide citation)

A timing recovery circuit at a receiver provides fine and coarse phase correction in the receiver's local oscillator. The coarse correction adds pulses to the local oscillator's output after it has been divided in frequency whenever the reduced frequency pulses appear outside of a timing window crea ...

Liberman Richard A: A synchronization system which uses the carrier and bit timing of an adjacent terminal. International Business Machines Corporation, March 21, 1972: US3651474 (11 worldwide citation)

A data communications system including apparatus at each remote location for detecting the carrier phase and bit timing of transmitted data from an adjacent, more remote terminal, to maintain synchronization for subsequent data transmissions from each remote terminal without the need for resynchroni ...

Liberman Richard A, Bond William C, Soltysiak Edwin J: Method and apparatus for testing teletypewriter terminals. General Datacomm, October 30, 1973: US3769454 (9 worldwide citation)

A method and apparatus are provided for the automatic testing of a data communication terminal and a data communication link to which the terminal is connected. A conventional data set or modem in the terminal to be tested is modified to permit the terminal to be inserted automatically into a test l ...