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Class Information
Number: 375/357
Name: Pulse or digital communications > Synchronizers > Synchronization failure prevention
Description: Subject matter in which there is apparatus to prevent the failure of the synchronization apparatus.










Patents under this class:
1 2 3 4 5 6 7 8 9 10

Patent Number Title Of Patent Date Issued
4635249 Glitchless clock signal control circuit for a duplicated system Jan. 6, 1987
4633193 Clock circuit synchronizer using a frequency synthesizer controlled by a frequency estimator Dec. 30, 1986
4630291 Externally synchronized timebase Dec. 16, 1986
4613979 Continuous, automatic reset of synchronous data receiver upon detection of loss of sync Sep. 23, 1986
4611336 Frame synchronization for distributed framing pattern in electronic communication systems Sep. 9, 1986
4592076 Synchronizing signal recovery circuit for radiotelephones May. 27, 1986
4583007 Failsafe decision circuit Apr. 15, 1986
4583054 Frequency time standard failure monitor Apr. 15, 1986
4574377 Synchronization method and apparatus in redundant time-division-multiple-access communication equipment Mar. 4, 1986
4569062 Interface circuit for interfacing between asynchronous data in start/stop format and synchronous data Feb. 4, 1986
4563767 Method of phase-synchronizing a transit exchange in a digital telecommunication network Jan. 7, 1986
4562574 Frame synchronizing signal insertion system Dec. 31, 1985
4561101 Clock-frequency recovery device adapted to high-frequency radiocommunications in disturbed media Dec. 24, 1985
4551845 System for phasing digital trains and application thereof to the switching of said trains Nov. 5, 1985
4538272 Prioritized clock selection circuit Aug. 27, 1985
4530095 Comparison of digital bit streams using modified parity Jul. 16, 1985
4507796 Electronic apparatus having low radio frequency interference from system clock signal Mar. 26, 1985
4481515 Coordinator for traffic signal controller Nov. 6, 1984
4480198 Device for increasing the operational security of a duplicated clock Oct. 30, 1984
4479230 Process and apparatus for the synchronization on reception of a signal provided with a synchronization pattern Oct. 23, 1984
4466110 Artificial sync signal adding circuit Aug. 14, 1984
4453260 Synchronizing circuit for detecting and interpolating sync signals contained in digital signal Jun. 5, 1984
4412342 Clock synchronization system Oct. 25, 1983
4397020 Error monitoring in digital transmission systems Aug. 2, 1983
4393492 Digital subscriber carrier system including drop terminals and bypass and loopback means and alarm indication means Jul. 12, 1983
4386323 Arrangement for synchronizing the phase of a local clock signal with an input signal May. 31, 1983
4369515 Clock synchronization circuit Jan. 18, 1983
4330854 Apparatus for generating an exchange pulse train for use in a telecommunications system May. 18, 1982
4322580 Clock selection circuit Mar. 30, 1982
4317212 Arrangement for checking the synchronization of a receiver Feb. 23, 1982
4316284 Frame resynchronization circuit for digital receiver Feb. 16, 1982
4316285 Framing circuit for digital receiver Feb. 16, 1982
4314206 Noise chopper for preventing false locks in a coherent carrier recovery system Feb. 2, 1982
4308472 Clock check circuit Dec. 29, 1981
4301537 Means and method for maintaining synchronization of a spread spectrum or other receiver clock Nov. 17, 1981
4301417 Quadriphase differential demodulator Nov. 17, 1981
4282493 Redundant clock signal generating circuitry Aug. 4, 1981
4282600 Method for synchronizing sending and receiving devices Aug. 4, 1981
4275466 Block sync signal extracting apparatus Jun. 23, 1981
4254492 Redundant clock system utilizing nonsynchronous oscillators Mar. 3, 1981
4253065 Clock distribution system for digital computers Feb. 24, 1981
4229699 Multiple clock selection system Oct. 21, 1980
4229792 Bus allocation synchronization system Oct. 21, 1980
4225960 Automatic synchronizing system for digital asynchronous communications Sep. 30, 1980
4213064 Redundant operation of counter modules Jul. 15, 1980
4204093 Variable frame rate technique for use in a time-division multiple access (TDMA) communication system May. 20, 1980
4201885 Routinable clock circuit May. 6, 1980
4172963 Checker and automatic synchronizer for coding equipment Oct. 30, 1979
4164629 Time base for synchronous generation of frame and clock pulses Aug. 14, 1979
4163946 Noise-immune master timing generator Aug. 7, 1979

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