1
George M Deputy Administrator of the National Aeronautics, and Space Administration with respect to an invention of, Low, Lucien A Couvillon Jr 1891 Alpha Road, 91208, Christopher Carl 303 N Oakland Avenue, 91101, Richard M Goldstein 5534 Rockcastle Drive, 91011, Edward C Posner 1460 Rose Villa, Richard R Green 252 D East California Street, CA 91106: Apparatus for deriving synchronizing pulses from pulses in a single channel pcm communications system. J H Warden, Paul F McCaul, John R Manning, October 31, 1972: US3701894 (40 worldwide citation)

A method and apparatus is disclosed for bit synchronization of a received PCM communications signal, without requiring a separate synchronization channel in the communications signal by digital correlation of the received square-wave signal with a predetermined number of phase displaced replicas of ...


2
Wiley Paul Ronald: High frequency character receiver. Bell Telephone Laboratories Incorporated, Padden F W, September 23, 1975: US3908084 (34 worldwide citation)

A receiver is disclosed for synchronized character pulse processing in a time slot interchange system. The receiver analyzes the phase of a character start pulse for synchronizing succeeding pulses of the character with out-of-phase clock signals of the same frequency. A delay line is included in th ...


3
Kneuer Joseph G: Timing recovery through distortion monitoring in data transmission systems. Bell Telephone Laboratories Incorporated, January 4, 1972: US3633108 (30 worldwide citation)

A receiver timing recovery arrangement for band-limited data transmission systems, particularly where adaptive equalizers are used, compensates for mistiming in the receiver eye pattern by generating caliper levels straddling a nominal received amplitude. The caliper spacing is continually expanded ...


4
Carlow Earl F, Hepworth Edward C: Digital phase shifter/synchronizer and method of shifting. Motorola, August 28, 1973: US3755748 (28 worldwide citation)

An electronic synchronizer for snychronizing the output pulse rate of an electronic clock with an input pulse train. The synchronizer provides a sampling signal output at a desired time within the time period of a single pulse of the input pulse train. The synchronizer phase-shifts the sampling sign ...


5
Welch James P, Siegel Stephen R: Clock signal assurance in digital data communication systems. Odetics, Hinderstein Philip M, February 11, 1975: US3865981 (26 worldwide citation)

In a digital data communication system of the type wherein digital data, synchronized by a reference clock, is applied to a counter, transitions of the digital data being utilized to reset the counter, the output of which is used to generate a coherant clock signal for the data, there is provided a ...


6
Horowitz Isaac, Laurich Lawrence A, Niccone Fred W: Second order digital phase-lock loop. International Business Machines Corporation, February 29, 1972: US3646452 (25 worldwide citation)

A digital second order phase-lock loop is built up utilizing all-digital circuits. The purpose of the loop is to synchronize a data gate signal in the synchronous data receiver with an incoming train of data pulses. One application of the system is the production of gate signals synchronized with da ...


7
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 ...


8
Heitzman James O: Receiver timing and synchronization system. Hughes Aircraft Company, June 6, 1972: US3668315 (24 worldwide citation)

A receiver timing and synchronization system useful in a digital data communication system for providing timing signals synchronized with received digital data. The receiver system includes means for providing small incremental changes in the locally generated timing signals to maintain synchronizat ...


9
Waggener William N: Adaptively tuned data receiver. Weston Instruments, Sherman William R, McMahon Kevin, Kavrukov I S, September 23, 1975: US3908115 (23 worldwide citation)

A data receiver has a digital filter which is adaptively tuned to the instantaneous bit-rate of a received noisy digital signal so as to provide an optimum transfer function despite irregularities in the received signal. A timing signal which reflects the true rate of the received signal adaptively ...


10
Halpern Peter H: Data synchronizing systems. General Dynamics Corporation, Lu Kacher Martin, April 15, 1975: US3878334 (23 worldwide citation)

A bit synchronizer system is disclosed which is adaptive to varying input conditions such as noise and jitter of data signals particularly PCM telemetry signals. The signal to noise parameter of the input data signal is obtained from a matched filter having a response matched to signals which are or ...