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| Number | Title | Issue Date |
| 6424927 | Computer-based real-time transient pulse monitoring system and method A computer-based transient pulse monitoring system and method are described. A general-purpose computer system having a processor, memory, and a digital signal bus for conveying digital signals, also includes a circuit board for measuring certain paramete... | 07/23/2002 |
| 6240372 | System for surveillance of spectral signals A method and system for monitoring at least one of a system, a process and a data source. A method and system have been developed for carrying out surveillance, testing and modification of an ongoing process or other source of data, such as a spectroscopi... | 05/29/2001 |
| 6134505 | Testing analog circuits using sigma-delta modulators An integrated circuit device has an analog block connected to a sigma-delta modulator. Analog signals from internal nodes in the analog block are fed to the sigma-delta modulator. The sigma-delta modulator produces digital representations of the analog si... | 10/17/2000 |
| 6115675 | Double interpolation anti-skew compensation of sampled analog data points in a protective relay A protective relay system comprises current and voltage transducers 10, filters 12, and a multiplexor 14, the latter outputting an interleaved stream of analog phase current and voltage signal samples, as well as neutral current samples. The analog multip... | 09/05/2000 |
| 6026348 | Apparatus and method for compressing measurement data correlative to machine status 051545044 A method and apparatus for compressing, storing and transmitting measurement data correlative to machine status is disclosed in which the measurement data is continuously sensed, sampled and processed to extract significant spectral elements inc... | 02/15/2000 |
| 5974361 | Waveform reconstruction from distorted (saturated) currents A method employed in a condition monitoring unit (CMU) for monitoring a circuit breaker or interrupter to obtain a substantially undistorted version of a waveform suffering from saturation distortion comprises employing a current transformer (CT) to measu... | 10/26/1999 |
| 5909658 | High speed electron beam lithography pattern processing system A pattern data processor system is disclosed that comprises a pattern storage device for storing pattern data, a Redundant Array of Independent Disks (RAID) pattern memory buffer for receiving and temporarily holding the pattern data from the pattern stor... | 06/01/1999 |
| 5828986 | Video camera for photographing animated images A video camera, capable of being connected with a computer, for photographing animated images. The video camera includes: a camera main body for outputting image signals corresponding to the animated images; and a memory adapter, detachable from the video... | 10/27/1998 |
| 5748105 | Fast technique for converting sampled analog measurements of a physical quanity to values expressed in engineering unit format An engineering unit converter system for converting an analog measurement into an engineering value. An analog measurement of a physical quantity is transformed into a digital value. The digital value is then split into a high order digit and a lower orde... | 05/05/1998 |
| 5671147 | AC mains test system for measuring current harmonics and voltage variations A digital system measures cyclic disturbance signals on an electrical line that are induced by a connected unit under test (UUT). The system includes a digital to analog (D/A) converter which receives and converts a first train of digital signals to a cyc... | 09/23/1997 |
| 5642300 | Precision voltage/current/power source In the precision source disclosed herein, a reference waveform and a correction waveform are combined and fed to an output amplifier which supplies an output waveform to a load, e.g., a wattmeter under test. The reference and correction waveforms are gene... | 06/24/1997 |
| 5490057 | Feedback control system having predictable open-loop gain A closed-loop feedback system has first and second gain elements. The first gain element has a transfer function such that Xd=Kg * (Xcont)z, where Xcont is a control variable input signal of the first gain element, Xd is a controlled variable o... | 02/06/1996 |
| 5477472 | Dual hysteresis method of generating square waves from non-uniform cyclical signals A system for anti-lock brake and traction control has a control circuit comprising a microprocessor on a silicon die. Inputs from several variable reluctance wheel speed sensors are multiplexed to a single channel on the same die for signal processing inc... | 12/19/1995 |
| 5357447 | Rate conversion apparatus A first clock signal of fl in frequency is converted into a second clock signal having a frequency of f2=(n/m) f1. The first clock signal is converted by a tank circuit (12) and a converter (13) into an R-bit first phase signal (θ1) indicating the phase ... | 10/18/1994 |
| 5233543 | Device for generating a current corresponding to a quantity supplied to the device A method and apparatus for generating a current corresponding to a quantity supplied to the device, for example an analog current output device for a digitally working process control system, using two parallel-working current-generating means, each one c... | 08/03/1993 |
| 5168439 | Inverter control method and apparatus A method and apparatus for controlling an inverter circuit to convert dc voltage to variable amplitude and frequency ac voltage use firing pattern tables which are stored and selected in accordance with a required voltage level for the ac voltage. The fir... | 12/01/1992 |
| 5111704 | Apparatus and method for simulating blade pass sensor signals A processor provides N series of discrete values, with each series of discrete values approximating a sinusoidal signal and N being the number of sensors with which a BVM to be tested is normally used. N digital to analog converters are provided, each rec... | 05/12/1992 |
| 5067089 | Device having signal interpolation circuit and displacement measuring apparatus comprising the device A device comprises output device for receiving signals having predetermined phases and outputting first and second signals having different phase angles and amplitudes, conversion device for converting the first signal into a first binary signal and the s... | 11/19/1991 |
| 5005141 | Phase-locked loop circuit A phase-locked loop circuit adapted to produce a stable output signal having the same frequency and phase as those of an input signal. Phase comparator means measures the time difference between the rising edge of the input signal and the falling edge of ... | 04/02/1991 |
| 4967161 | Signal processing method and apparatus A signal processing method or apparatus in which an input signal is converted to a signal of a predetermined frequency characteristic and the resulting signal is reconverted to a signal of the original frequency characteristic, comprising: a first signal ... | 10/30/1990 |
| 4924420 | Tacho signal processing This invention relates to apparatus for producing a periodic output signal having a predetermined period ratio (a/b) relative to a periodic input signal. Signals from a tachometer on a gearbox are received by a counter timer unit, the counter timer unit e... | 05/08/1990 |
| 4723216 | Digital frequency-locked loop for use with staggered sampling systems A digital frequency locked loop is disclosed for use with programmable signal processing apparatus wherein frequency locking is desired from staggered data samples. Sampling means are provided for sampling an input signal, at instants determined by the sa... | 02/02/1988 |
| 4715001 | Extremely accurate automatic frequency control circuit and method therefor An automatic frequency control circuit having the ability to resolve the frequency of an incoming signal to an extreme level of accuracy and to tolerate amplitude and pulse modulation on the incoming signal is disclosed. Two negative feedback loops are ut... | 12/22/1987 |
| 4715000 | Digital phase-locked loop and frequency measuring device Method and apparatus are disclosed for providing a sampling signal having a frequency which is maintained in constant proportion to the frequency of an input signal. The input signal is sampled at instants determined by the sampling signal to provide a pl... | 12/22/1987 |
| 4267570 | Control unit for multi-phase static converter A digital control unit has an oscillator driven, binary coded counter, the outputs of which are connected to the first addend inputs of a number of adders. The second addend inputs of the adders are connected to phase angle inputs. The summation outputs o... | 05/12/1981 |
| 4107600 | Adaptive frequency to digital converter system In a system for converting information in the form of an AC frequency to digital data, a binary number having a magnitude proportional to the frequency is derived by generating a stream of pulses at a known clock rate and counting the number of pulses occ... | 08/15/1978 |
