In this report, a new interpretation of the main part of our study on asymptotic behaviour of reduced-order lters in 6] is given. Approximate lters are proposed for semi-linear and nonlinear stochastic systems with colored noises. Basically these lters are deened as those which are optimal when the noises are white. Their long time behavior is investigated and their asymp-totic optimality is sh...

A novel structure called tapped cascaded adap-tive allpass lter is proposed. It is basically an adaptive nite impulse response (AFIR) lter where the delays are replaced by allpass lters. The system induces a better stability monitoring mechanism than in a generic adaptive inn-nite impulse (AIIR) lter. Two adaptation algorithms are derived. The rst one is for adapting the tap-weights when the al...

The discrete Kalman lter, which is becoming a common tool for reducing uncertainty in robot navigation, suuers from some basic limitations when used for such applications. In this paper, we describe a recursive total least squares estimator (RTLS) as an alternative to the Kalman lter, and compare their performances in three sets of experiments involving problems in robot navigation. In all case...

This paper deals with the real-time implementation of the IIR lters having linear phase. Powell and Chau have devised an e cient method for the design and realization of real-time linear phase IIR lters using suitable modi cations of the well-known time reversing technique. In their method, the input signal is divided into L-sample segments, time-reversed, and twice ltered using two IIR lter bl...

In this paper, we introduce a polyphase implementation and design of an oversampled K-channel generalized DFT (GDFT) l-ter bank, which can be employed for subband adaptive ltering, and therefore is required to have a low aliasing level in the subband signals. A polyphase structure is derived which can be factorized into a real valued polyphase network and a GDFT modulation. For the latter, an F...

An impressive variety of multirate lter banks evolved during the past twenty years. We present an algebraic approach that subsumes many concepts developed so far (e. g. multi lters, nonseparable multidimensional lter banks, cyclic lter banks, lter banks with values in nite elds, etc.). In our approach the signals and lters are viewed as elements of a group ring. We give necessary and su cient c...

In this paper, we present a new discrete Lagrangian optimization method for designing multiplier-less QMF (quadrature mirror lter) lter banks. In multiplierless QMF lter banks, lter coeecients are powers-of-two (PO2) where numbers are represented as sums or diierences of powers of two (also called Canonical Signed Digit{CSD{representation), and multiplications can be carried out as additions , ...

A common method for measuring the mass of organic carbon in airborne particulate matter involves collection on a quartz "lter and subsequent thermal analysis. If unaccounted for, the adsorption of organic gases onto quartz "lters will lead to the overestimation of aerosol organic carbon concentrations (positive artifact). A recommended method of correction for the positive artifact involves sam...

This paper presents a new method for designing two-band orthonormal IIR wavelet "lter banks using allpass "lters. It is well known that orthonormal wavelet bases can be generated by paraunitary "lter banks. Thus, synthesis of orthonormal wavelet bases can be reduced to the design of paraunitary "lter banks. In this paper, two-band orthonormal IIR wavelet "lter banks using a parallel connection ...

This paper explores data curation in a Long Term Ecological Research (LTER) setting. It describes a number of salient data characteristics that are specific to the discipline and outlines some central features of the curation approach cultivated within the US LTER network. It goes on to identify recent developments within the international LTER program relating to data issues: increasing hetero...