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| Number | Title | Issue Date |
| 4418318 | Digital phase-locked loop circuit A digital phase-locked loop consisting of a digital phase detector for detecting the phase differences between the output and the input frequency signals, a microprocessor programmed to perform both the functions of the loop filter and the phase shifter, ... | 11/29/1983 |
| 4412342 | Clock synchronization system A clock synchronization system for use in a digital switching system including multiple clock circuits. This circuit includes multiple synchronization circuits connected in a master-slave arrangement. Each synchronization circuit includes a counter chain ... | 10/25/1983 |
| 4390801 | Circuit for reproducing a clock signal A circuit for reproducing a clock signal from digital signals reproduced from a recording medium makes self-clocking possible. The circuit includes a phase lock loop having a voltage-controlled oscillator that generates an oscillation output at a frequenc... | 06/28/1983 |
| 4375694 | All rate bit synchronizer with automatic frequency ranging A bit synchronizer capable of operation over all frequencies, limited only by the speed of the integrated circuits and other components. The input data can be any random antipodal data. A programmable scaling circuit allows the operator to select the desi... | 03/01/1983 |
| 4373204 | Phase locked loop timing recovery circuit The phase of timing signals is compared with the phase of incoming digital signals to produce phase error signals and repeated phase corrections of the timing signals are made in accordance with the phase error signals. The phase corrections are initially... | 02/08/1983 |
| 4327376 | Dual phase-control loop horizontal deflection synchronizing circuit A television horizontal deflection synchronizing system uses two phase-lock loops. A horizontal oscillator operating at a frequency greater than the horizontal frequency is counted and a bilevel signal near the horizontal frequency is generated. A first p... | 04/27/1982 |
| 4327336 | Microwave phase locked loops using FET frequency dividers Disclosed is a microwave frequency generator for producing a microwave signal with high frequency accuracy, high spectral purity, low noise and high frequency stability. It is known to phase lock the fundamental microwave oscillator to a highly stable cry... | 04/27/1982 |
| 4325031 | Divider with dual modulus prescaler for phase locked loop frequency synthesizer A high frequency divider suitable for use in a frequency synthesizer using a dual modulus prescaler and two counters to achieve high speed and low current drain. The input signal is alternately divided by one of the two moduli in the prescaler and then al... | 04/13/1982 |
| 4321483 | Apparatus for deriving clock pulses from return-to-zero data pulses A phase-locked loop apparatus for deriving clock pulses from return-to-zero data pulses is disclosed. It includes a phase detector for computing the difference, in time, between that portion of a detected data pulse which occurs before a clock pulse edge ... | 03/23/1982 |
| 4320515 | Bit synchronizer A bit synchronizer for T-4 fiber optic data communication environments is configured of an input buffer amplifier to which the data to be regenerated is applied. The input buffer provides isolation between upstream signal processing circuitry and a bit ra... | 03/16/1982 |
| 4309662 | Circuit for rapidly resynchronizing a clock A circuit for rapidly resynchronizing a clock with an external clock is disclosed. The clock to be synchronized is obtained at the output of a phase-locked loop by dividing the frequency of a reference clock in a frequency divider whose division factor is... | 01/05/1982 |
| 4229824 | Method and apparatus for synchronizing electrical signals In the disclosed method and apparatus, a local generator signal is initially generated with a phase that is arbitrary with respect to the input signal. Subsequently, the phase difference between any two successive bits of these signals is measured. Then t... | 10/21/1980 |
| 4222009 | Phase lock loop preconditioning circuit A preconditioning circuit is inserted in series between a coded stream of data pulses and a standard commercially available phase lock loop of the type having a nonharmonic phase detector. The novel preconditioning circuit converts the input coded stream ... | 09/09/1980 |
| 4219770 | Insertion loss and phase shift measurement system and method Insertion loss measurement at microwave frequencies is achieved using an improved IF substitution technique wherein the IF test signal is applied to a feedback loop which generates a feedback signal to null out the test signal. A precision calibrated atte... | 08/26/1980 |
| 4187473 | Electronic phase locked loop circuit An electronic phase locked loop circuit including a variable period sawtooth generator. The sawtooth generator receives digital reference clock signals and in response thereto generates sawtooth-shaped signals having the same period as said reference cloc... | 02/05/1980 |
| 4160217 | Phase locked loop circuit A phase locked loop includes a variable frequency oscillator, a phase comparator for comparing the phase between an output signal derived from the variable frequency oscillator and a reference signal and for generating a control signal in response to the ... | 07/03/1979 |
| 4122487 | Precision phase controlled clock for sampling television signals A method and apparatus is disclosed for sampling an analog information signal having an associated carrier signal at precise phase positions with respect to said carrier, which involves sampling the information signal at predetermined phase positions rela... | 10/24/1978 |
| 4121172 | Dual loop phase locked oscillator system A dual loop phase locked oscillator system comprises a pair of phase locked oscillators coupled with priority logic gates for selectively operating each oscillator. During a lock-to-data mode, the logic gates are operated so that one of the oscillators is... | 10/17/1978 |
| 4110557 | Phase lock oscillator for use in data processing system A phase lock oscillator system employing a phase and frequency detector which receives the data pulses and the clocking signal modulated to include only the clocking pulses corresponding in timed sequence to the actual data pulses for generating an error ... | 08/29/1978 |
| 4086539 | First-order phase-lock loop A first order phase-lock loop that provides lower phase-error variance than classical systems at all frequencies when operated above threshold. The linear, minimum-variance filter described, in preferred form, employs three summers, two integrators, four ... | 04/25/1978 |
| 4080576 | Tow mode harmonic and nonharmonic phase detector A phase detector for use in data systems which recovers data from a recorded media, which phase detector operates in a nonharmonic mode during the period of synchronization of the clock frequency and phase with that of preamble data, and operates in a har... | 03/21/1978 |
| 4065796 | Digital data decoder A digital data decoder for recovering data from magnetic media utilizes a phase-locked loop incorporating a dual slope detecting circuit and a window margin test so as to allow for higher density data and for quality verification of the data without the u... | 12/27/1977 |
| 4059812 | Synchronous pulse generator including flywheel tank circuit with phase locked loop A circuit receiving a degraded synchronous pulse signal which has missing pulses and phase-shifted pulses, and producing an output signal similar to and at a constant phase angle with the input signal, in which the missing pulses have been replaced and th... | 11/22/1977 |
| 4043438 | Printing control circuit A phase-locked loop circuit for use in a printer which automatically compensates for speed changes in the print head due to changes in line frequency to maintain consistent character width print impressions.... | 08/23/1977 |
| 4023116 | Phase-locked loop frequency synthesizer A phase-locked loop frequency synthesizer is described not having the uncontrolled modulation of its output normally associated with such a synthesizer due to a detection dead band inherent in the phase/frequency comparator which is a principal part there... | 05/10/1977 |
| 4004237 | System for communication and navigation A radio navigation and digital communication system is used for the transmission of navigation modulation and digital data. A modulation locked loop, which may be constructed with three channels, is used to develop synchronization signals for the digital ... | 01/18/1977 |
| 3983506 | Acquisition process in a phase-locked-loop by gated means A phase-locked-loop circuit configuration is described which eliminates the statistical nature of the acquisition process, thereby improving or decreasing the acquisition or lock-up-time of the loop. The circuit configuration is such that given an input s... | 09/28/1976 |
| 3983498 | Digital phase lock loop A fast responding, low jitter, digital phase lock loop which is especially suited for synchronous, non return to zero, digitally encoded clock recovery applications. Both leading and trailing transitions of the digital waveform triggers a monostable multi... | 09/28/1976 |
| 3983497 | Phase locked loop A signal frequency, controlled by the output of a phase comparator, is obtained from a constant or reference signal frequency source by means of a frequency divider, the division ratio of which is voltage-controlled and variable, the control signal being ... | 09/28/1976 |
| 3973212 | Phase detection in phase lock loop circuit Phase detection in a phase lock loop circuit is performed by periodically sampling the A. C. carrier communication signal applied thereto in response to a sample timing signal having a periodic frequency twice that of the carrier and a polarity check sign... | 08/03/1976 |
| 3958186 | Wideband phase locked loop transmitter system A phase locked loop including a reference oscillator connected to one input of a loop phase detector the output of which is connected through an integrating low pass filter to a voltage controlled oscillator with the output of the voltage controlled oscil... | 05/18/1976 |
