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| Number | Title | Issue Date |
| 4821167 | Method and apparatus for sequential control of analogue signals A method and apparatus are provided for managing a plurality of analogue signals for digital control. Analogue input signals received from a process are periodically sampled and converted to digital input signals for access by a digital control. Digital o... | 04/11/1989 |
| 4802189 | Method and circuit arrangement for the transmission of data signals between subscriber stations of a data network For the transmission of data signals between subscriber stations of a data network to which subscriber stations designed for transmitting and receiving data signals having different signal rates, a calling subscriber station first outputs an information s... | 01/31/1989 |
| 4799165 | Level detecting waveform sampling system A level detecting waveform digitizer for repetitively sampling an analog waveform and converting analog samples into representative digital data is provided with a predictive time base circuit for accurately controlling sample timing with respect to a tri... | 01/17/1989 |
| 4718027 | Dynamically adjustable linear data discriminator A method of discriminating between linear and nonlinear regions of measured data is based upon two hypotheses, one of which is a hypothesis that a response is merely a result of inherent randomness and the other of which is a hypothesis that the response ... | 01/05/1988 |
| 4701839 | Sampled data servo control system with field orientation The present invention provides a high response inexpensive microprocessor based digital control system. The digital control system uses only one detector that detects only one motion characteristic of the device controlled by the system. In the preferred ... | 10/20/1987 |
| 4673916 | Method and system for decoding a digital signal using a variable frequency low-pass filter In a data compression system, a digital signal comprising a series of digital samples and a sampling datum indicating the sampling interval of the digital samples are written into a read-write memory (M2). The digital samples and the associated sampling d... | 06/16/1987 |
| 4665398 | Method of sampling and recording information pertaining to a physical condition detected in a well bore A physical condition in a well bore is sampled and information taken from the sample is recorded by a method of conserving electrical energy in performing such sampling and recording. The method sequentially energizes and de-energizes a plurality of diffe... | 05/12/1987 |
| 4663628 | Method of sampling environmental conditions with a self-contained downhole gauge system The method for controlling the rate at which a downhole logging tool samples and records a detected condition obtains three samples of the condition at three consecutive sample times and computes a prediction value for the n-th sample from the first three... | 05/05/1987 |
| 4635182 | Apparatus for controlling multiple time-varying processes An apparatus for and a method of controlling multiple time varying proces by a central control device through a use of an adaptive data acquisition scheme is disclosed. A state estimator is used to extrapolate the current state of each control process as... | 01/06/1987 |
| 4633222 | Clock shaping circuit and method Clock shaping means responsive to the frequency of an incoming clock signal (CLI) produce asymmetrical clocking signals whose high to low ratio varies as a function of the frequency of CLI. The asymmetrical clocking signals when appl... | 12/30/1986 |
| 4626827 | Method and system for data compression by variable frequency sampling A data compression system comprises an analog-to-digital converter for quantizing the analog signal at a first sampling frequency into a series of digital samples and a memory for storing the digital samples. A control circuit generates a sampling datum i... | 12/02/1986 |
| 4568912 | Method and system for translating digital signal sampled at variable frequency In a data compression system, a digital signal comprising a series of digital samples and a sampling datum associated with each digital sample is received by a decoder. The sampling datum indicates the sampling interval of the associated digital sample. T... | 02/04/1986 |
| 4558422 | Digital signal sampling system with two unrelated sampling timebases A digital signal sampling system is disclosed for reconstructing the time relationship of digital data signals sampled by two sampling clock signals with different unrelated timebases. The digital data signals sampled may be the same data signal or two di... | 12/10/1985 |
| 4546436 | Portable pH data collector The present invention provides an apparatus for continuously recording physiological data. The invention includes a unique data mapping and compression technique which allows relatively long term data acquisition without compromising the data sampling rat... | 10/08/1985 |
| 4488240 | Vibration monitoring system for aircraft engines A vibration monitoring system for aircraft engines includes a nonrecursive digital filter network controlled by a data processor. Digital techniques process tachometer signals to general sampling signals at a frequency which is an integral multiple of the... | 12/11/1984 |
| 4481589 | Material forming machine controller A control method and apparatus for a metal-forming machine such as a cold heading machine are described. The described method and apparatus monitor machine operation during production and permit relatively large deviations from a prescribed norm over a sh... | 11/06/1984 |
| 4471452 | Digital time base with coherent rate switching A digital time base for producing sample clock pulses is provided with a control circuit to permit coherent switching from one sample rate to another. A plurality of predetermined sampling rates and number of samples to be acquired at each rate are stored... | 09/11/1984 |
| 4441196 | Speed independent system for obtaining preselected numbers of samples from object moving along fixed path A speed independent system is used for obtaining a preselected number of samples from an object moving along a fixed path, such as a railroad train passing through a sensing zone along the section of track. The sensing zone is defined by a pair of wheel s... | 04/03/1984 |
| 4426641 | Method and apparatus for monitoring the shaft vibration of a rotary machine From the viewpoint of the preventive maintenance operation of a rotary machine, it is a very important subject to monitor the shaft vibration of the rotary machine and grasp the operating state of the machine. This invention relates to input processings i... | 01/17/1984 |
| 4418388 | Engine waveform pattern analyzer An apparatus which permits the automated diagnosis of automobile engine electrical system waveform patterns is disclosed. Employed in conjunction with an addressable random access memory which stores digitized information concerning the waveform are furth... | 11/29/1983 |
| 4388611 | Electricity billing meter having unique A/D conversion system Voltage and current signals in a power distribution system are converted to digital data by scaling and sampling the signals and simultaneously comparing all the samples to a digitally generated ramp converted to analog form. When a sample intersects the ... | 06/14/1983 |
| 4308585 | Electronic memory unit In an electronic memory unit for processing a pair of transient electrical signals prior to recording by an XY plotter, a random access memory receives digitized samples of the signals at a dynamically variable rate which is determined by the rate of chan... | 12/29/1981 |
| 4298955 | Method of and apparatus for the detection and analysis of hazards The invention provides a system for detecting and analysing deviations from normal in the operating conditions of a process, for example a chemical manufacturing process. The system comprises transducers positioned to detect a plurality of operating param... | 11/03/1981 |
| 4161782 | Microprocessor computerized pressure/temperature/time down-hole recorder A down-hole temperature, pressure and time measuring and digital data storage tool, utilizing self-contained microprocessor-based data taking and data reduction, with power conservation realized by processor controlled powering of data transducers only du... | 07/17/1979 |
| 4136396 | Data processing In a data processing system and method, particularly for processing data derived from a gauge which is measuring the thickness of continuous metal strip issuing from a metal processing plant, the value of the measurement data is sampled at successive time... | 01/23/1979 |
