257 research outputs found
Роль фахових кафедр в організації науково-дослідної діяльності студентів вищих навчальних закладів мистецького спрямування
У статті порушуються питання організації та надання консультативної допомоги щодо виконання кваліфікаційних робіт студентами і магістрантами вищих навчальних закладів мистецького спрямування. Пріоритет надається індивідуальній роботі наукового керівника зі студентом щодо змісту кваліфікаційної роботи, вибору методів і методик, запровадженню організаційно-педагогічних умов спрямованих на підвищення ефективності наукового дослідження
On Frequency-Domain Implementation of Digital FIR Filters Using Overlap-Add and Overlap-Save Techniques
In this paper, new insights in frequency-domain implementations of digital
finite-length impulse response filtering (linear convolution) using overlap-add
and overlap-save techniques are provided. It is shown that, in practical
finite-wordlength implementations, the overall system corresponds to a
time-varying system that can be represented in essentially two different ways.
One way is to represent the system with a distortion function and aliasing
functions, which in this paper is derived from multirate filter bank
representations. The other way is to use a periodically time-varying
impulse-response representation or, equivalently, a set of time-invariant
impulse responses and the corresponding frequency responses. The paper provides
systematic derivations and analyses of these representations along with filter
impulse response properties and design examples. The representations are
particularly useful when analyzing the effect of coefficient quantizations as
well as the use of shorter DFT lengths than theoretically required. A
comprehensive computational-complexity analysis is also provided, and accurate
formulas for estimating the optimal DFT lengths for given filter lengths are
derived. Using optimal DFT lengths, it is shown that the frequency-domain
implementations have lower computational complexities (multiplication rates)
than the corresponding time-domain implementations for filter lengths that are
shorter than those reported earlier in the literature. In particular, for
general (unsymmetric) filters, the frequency-domain implementations are shown
to be more efficient for all filter lengths. This opens up for new
considerations when comparing complexities of different filter implementations.Comment: 13 pages, 26 figure
Integer Linear Programming Modeling of Addition Sequences With Additional Constraints for Evaluation of Power Terms
In this work, an integer linear programming (ILP) based model is proposed for
the computation of a minimal cost addition sequence for a given set of
integers. Since exponents are additive under multiplication, the minimal length
addition sequence will provide an economical solution for the evaluation of a
requested set of power terms. This is turn, finds application in, e.g.,
window-based exponentiation for cryptography and polynomial evaluation. Not
only is an optimal model proposed, the model is extended to consider different
costs for multipliers and squarers as well as controlling the depth of the
resulting addition sequence.Comment: This manuscript was written in 2012, and, hence, lacks more recent
reference
Stochastic Analysis of LMS Algorithm with Delayed Block Coefficient Adaptation
In high sample-rate applications of the least-mean-square (LMS) adaptive
filtering algorithm, pipelining or/and block processing is required. In this
paper, a stochastic analysis of the delayed block LMS algorithm is presented.
As opposed to earlier work, pipelining and block processing are jointly
considered and extensively examined. Different analyses for the steady and
transient states to estimate the step-size bound, adaptation accuracy and
adaptation speed based on the recursive relation of delayed block excess mean
square error (MSE) are presented. The effect of different amounts of pipelining
delays and block sizes on the adaptation accuracy and speed of the adaptive
filter with different filter taps and speed-ups are studied. It is concluded
that for a constant speed-up, a large delay and small block size lead to a
slower convergence rate compared to a small delay and large block size with
almost the same steady-state MSE. Monte Carlo simulations indicate a fairly
good agreement with the proposed estimates for Gaussian inputs.Comment: 13 pages, 8 figure
Особливості вживання часових форм у текстах художнього стилю (на матеріалі німецької мови)
(UA) У статті розглядається вживання часових форм дієслова як стилістичних засобів; розкриваються особливості реалізації та функціонування категорії часу з точки зору лінгвістики тексту.(EN) The article views the usage of the tense forms of the verb as stylistic devices in belles-lettres texts; it highlights the peculiarities of realization and functioning of the category “Time” from the point of view of linguistics of the text
Теоретичні основи інтеграції знань у системі вокально-хорової підготовки майбутнього вчителя музичного мистецтва
У статті визначено теоретичні основи інтеграції знань у системі вокально-хорової підготовки майбутнього вчителя музичного мистецтва, обґрунтовано суть інтегративного підходу до професійного навчання студентів педагогічного університету
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