The output indications of fluid-filled transducers are compensated by filtering under the control of error analyser signals. In particular, the pressure waveform of a fluid-filled catheter is sampled and used to produce error signals that control a digital filter for the samples in order to compensate for measurement errors that are attributable to the physical characteristics of the catheter.

Discriminate reduction data processing is disclosed as means of providing multivariate linear and nonlinear data reduction for the evaluation of statistically representative approximating parameters which effectively minimize parametric expressions representing sums of normalized datum variances. Weight factors are provided as products of datum error deviation coordinate normalizing proportions to account for nonlinearities, nonuniform error distributions, variable precision uncertainties. Selec...

A resonator produces a signal which is processed by being digitized and demodulated. The processed signal is applied to a filter having three sections. The first is a lowpass filter, the second is a decimator, and the third is an equalizer filter. The lowpass filter filters out the high frequency components which would be aliased by the decimator. The equalizer filter performs whatever processing as is appropriate for the measurement which is sought. A second or subsequent equalizer filter may b...

A passive electronic warfare system must deinterleave trains of pulses from a number of radar transmitters. An adaptive parametric channelizer for acquiring and tracking trains of pulses consists of an input channelizer operating under the control of a resource control processor. Each pulse descriptor word (PDW), a set of digitized signal parameters measured by a specialized receiver of radar pulse signals, is temporarily stored in a first-in-first out (FIFO) buffer memory. PDW data from the FIF...

To compensate for quasi-periodic disturbances in measurement signals, the wanted signal is separated from the disturbing signal by determining from an auxiliary signal a series of trigger instants, and estimating from this measurement signal a disturbing signal template, by furthermore generating from this disturbing signal template a trigger-synchronous reference signal, and by using this trigger-synchronous reference signal for filtering the measurement signal. The process can be carried out b...

A method for low pass filtering data used in change-detect compression of data collected from a system includes buffering the data from said system. Rolling averages of the buffered data are calculated where the calculation of the rolling averages low pass filters the data. Change-detect compression is performed on the rolling averaged data, and the compressed data are archived. The archived data are transmitted to a central location and received. The received data are archived at the central lo...

A system for tracking and positioning a moving object, the system including a plurality of transmitters operative to transmit alternating electromagnetic fields within a three-dimensional space and at least one sensor arranged to be fixed to at least one corresponding portion of a moving object whose position it is sought to monitor. Each of said at least one sensors includes an electromagnetic field receiver having at least one active axis and operative to receive at least one component, lying ...

Symmetry in a filter is used to reduce the complexity of an interpolator or a decimator and to simplify derivation of resulting discrete samples. In particular, an inverse relationship between weights applied to two samples is recognized and exploited. An inverse relationship is recognized when a first weight is associated with a first of the samples and a second weight is associated with a second of the samples and a weight which is equivalent to the first weight is associated with the second s...

This invention relates to a recording node for receiving energy-related consumption meter data, for calculating consumption amount and consumption rate, and for storing such information. The invention further relates to networks into which the recording node is incorporated, or which can otherwise be accessed by the recording node. The recording node receives signals from a meter and calculates a current consumption rate value and a predicted consumption value for a time interval. At the end of ...

An apparatus, computer program product and method of analyzing non-stationary time varying phenomena. A representation of a non-stationary time varying phenomenon is recursively sifted using Empirical Mode Decomposition (EMD) to extract intrinsic mode functions (IMFs). The representation is filtered to extract intrinsic trends by combining a number of IMFs. The intrinsic trend is inherent in the data and identifies an IMF indicating the variability of the phenomena. The trend also may be used to...