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Wyświetlanie 1-15 z 170
Tytuł:
Entropy Coder for Audio Signals
Autorzy:
Ulacha, G.
Stasinski, R.
Powiązania:
https://bibliotekanauki.pl/articles/226974.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
lossless audio coding
entropy coding
OLS
Opis:
In the paper an effective entropy coder designed for coding of prediction errors of audio signals is presented. The coder is implemented inside a greater structure, which signal modeling part is a lossless coding backward adaptation algorithm consisting of cascaded Ordinary Least Squares (OLS), three Normalized Least Mean Square (NLMS), and prediction error bias correction sections. The technique performance is compared to that of four other lossless codecs, including MPEG-4 Audio Lossless (ALS) one, and it is shown that indeed, on the average the new method is the best. The entropy coder is an advanced context adaptive Golomb one followed by two context adaptive arithmetic coders.
Źródło:
International Journal of Electronics and Telecommunications; 2015, 61, 2; 219-224
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resource Tuned Optimal Random Network Coding for Single Hop Multicast future 5G Networks
Autorzy:
Dong, Dhawa Sang
Pokhrel, Yagnya Murti
Gachhadar, Anand
Qamar, Faizan
Amiri, Iraj Sadegh
Maharjan, Ram Krishna
Powiązania:
https://bibliotekanauki.pl/articles/226605.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
coding coefficients
computational complexity
lower triangular matrix
random network coding
sparse coding
coefficients
Opis:
Optimal random network coding is reduced complexity in computation of coding coefficients, computation of encoded packets and coefficients are such that minimal transmission bandwidth is enough to transmit coding coefficient to the destinations and decoding process can be carried out as soon as encoded packets are started being received at the destination and decoding process has lower computational complexity. But in traditional random network coding, decoding process is possible only after receiving all encoded packets at receiving nodes. Optimal random network coding also reduces the cost of computation. In this research work, coding coefficient matrix size is determined by the size of layers which defines the number of symbols or packets being involved in coding process. Coding coefficient matrix elements are defined such that it has minimal operations of addition and multiplication during coding and decoding process reducing computational complexity by introducing sparseness in coding coefficients and partial decoding is also possible with the given coding coefficient matrix with systematic sparseness in coding coefficients resulting lower triangular coding coefficients matrix. For the optimal utility of computational resources, depending upon the computational resources unoccupied such as memory available resources budget tuned windowing size is used to define the size of the coefficient matrix.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 3; 463-469
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Joint Source-Channel Coding in Dictionary Methods of Lossless Data Compression
Autorzy:
Rodziewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/226851.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
channel coding
joint source-channel coding
lossless data compression LZ 77
LZSS
source coding
Opis:
Limitations on memory and resources of communications systems require powerful data compression methods. Decompression of compressed data stream is very sensitive to errors which arise during transmission over noisy channels, therefore error correction coding is also required. One of the solutions to this problem is the application of joint source and channel coding. This paper contains a description of methods of joint source-channel coding based on the popular data compression algorithms LZ'77 and LZSS. These methods are capable of introducing some error resiliency into compressed stream of data without degradation of the compression ratio. We analyze joint source and channel coding algorithms based on these compression methods and present their novel extensions. We also present some simulation results showing usefulness and achievable quality of the analyzed algorithms.
Źródło:
International Journal of Electronics and Telecommunications; 2010, 56, 4; 351-355
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hierarchical Fast Selection of Intraframe Prediction Mode in HEVC
Autorzy:
Siast, J.
Stankowski, J.
Domański, M.
Powiązania:
https://bibliotekanauki.pl/articles/226081.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
video coding
high efficiency video coding (HEVC)
intraframe prediction
fast mode selection
Opis:
In the new HEVC standard, there are 35 intraframe prediction modes. Therefore, real-time implementations need fast mode pre-selection to reduce the computational load of cost comparison for individual modes. In this paper, a simple technique is proposed to reduce the complexity of the Unified Intra Prediction by decreasing the mode candidate number evaluated in the Rough Mode Decision step. We call this approach hierarchical as we decrease stepwise the angles between the directions of the prediction modes that are tested. Obviously, the fast mode selection results in significant complexity reduction obtained at the cost of choosing a sub-optimum mode related to slightly reduced compression performance. In the paper, it is proposed how to calculate the trade-off between encoder complexity and compression performance, using the ratio of relative coding time reduction and average bitrate increase estimated for constant decoded video quality. Extensive experiments prove that this ratio is much higher for the proposed technique than for many other techniques from the references.
Źródło:
International Journal of Electronics and Telecommunications; 2016, 62, 2; 147-151
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Rasch Analysis of Student Coding Attitudes Survey
Autorzy:
Alasgarova, Gunel A.
Powiązania:
https://bibliotekanauki.pl/articles/2034190.pdf
Data publikacji:
2022-03-31
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
Coding attitude
coding interest
perception of coders
social value
Rasch analysis
Opis:
The purpose of this study was to examine the psychometric properties of a 23-item scale preliminarily entitled the “Elementary Student Coding Attitudes Survey” (ESCAS) from a Rasch perspective. The ESCAS includes five latent constructs to assess attitudes: coding confidence, interest, utility, perceptions of coders, and social value using Item Response Theory [IRT]. The item summary statistics, person summary statistics, item misfit statistics, and category structure statistics were examined for each component. In examining the five constructs separately, the measure had above average psychometric properties with no misfitting items and higher internal-consistency reliability.
Źródło:
The New Educational Review; 2022, 67; 237-248
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Koncepcja implementacji w układzie FPGA dekodowania VLC dla potrzeb sprzętowej dekompresji w standardzie cyfrowego wideo DV
Concept design of FPGA-based VLC decoder implementation for the hardware decoding system compliant with DV standard
Autorzy:
Cichoń, S.
Powiązania:
https://bibliotekanauki.pl/articles/154772.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
kodowanie entropijne
kompresja wewnątrz-ramkowa
architektura potokowa
entropy coding
intraframe coding
pipeline architecture
Opis:
Kodowanie VLC (ang. Variable Length Coding) jest odmianą kodowania entropijnego. W różnych odmianach występuje ono w wielu standardach kompresji wideo. W niniejszej publikacji opisany zostanie algorytm kodowania VLC stosowany w kompresji DV, oraz następujący po nim etap formowania skompresowanego segmentu wizji. Zaproponowana zostanie koncepcja implementacji dekodera VLC w układzie reprogramowalnym, realizująca wszystkie trzy etapy, z uwzględnieniem aspektów wykorzystania w sprzętowym dekoderze.
VLC coding (Variable Length Coding) is one of entropy type coding. With different modifications it is used in many video compression standards of both moving and still images, e.g. JPEG, MPEG-2, DV (IEC 61834). In the paper the VLC coding algorithm used in DV as well as a consecutive compressed video data forming phase together with the macroblock compressed area built in this process are described in details. This phase is performed in three stages, each on different data granularity, which generates some constraints with regard to FPGA implementation. In the paper there are presented experimental results which show that stages 2 and 3 have an influence on the higher overall quality of the decompression. The previous works [3][4] were focused on the first, or on the first and second decoding stage. There is described the concept design of VLC decoder implementation in a reprogrammable chip, realising all three stages in compliance with the IEC-61834 standard when taking into account reusing it in a hardware DV decoder as a processing element in the pipeline architecture.
Źródło:
Pomiary Automatyka Kontrola; 2010, R. 56, nr 7, 7; 755-757
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel Ideas for Lossless Audio Coding
Autorzy:
Ulacha, G.
Stasiński, R.
Powiązania:
https://bibliotekanauki.pl/articles/227339.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Lossless Audio Coding
context coding
LS predictors
MMSE
MMAE
zero-order entropy
Opis:
Novel ideas for lossless audio coding analyzed in the paper are linked with forward predictor adaptation, and concern optimization of predictors on the basis of zero-order entropy and MMAE criterions, and context sound coding. Direct use of the former criterion is linked with exponential growth of optimization procedure, hence, a suboptimal algorithm having polynomial complexity is proposed. It is shown that on average the new types of predictors are better than those obtained by MMSE technique, while two- and three context systems are on average better than a single predictor one. It also appears that 7-bit PARCOR coefficients in the MPEG-4 ALS standard have insufficient precision for some predictor length, and that for very long frames coding results improve with the predictor rank practically in unlimited way.
Źródło:
International Journal of Electronics and Telecommunications; 2013, 59, 1; 17-23
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selection of Wavelet Video Codec Parameters to Optimize Coding Time
Autorzy:
Popławski, A.
Powiązania:
https://bibliotekanauki.pl/articles/226134.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
optimization
wavelet video coding
scalability
Opis:
In the paper, results of experimental research on wavelet video codec are presented. The author has put emphasis on the optimal selection of the coder parameters to optimize the coding time. The author has used six test sequences (Basket, City, Crew, Harbour, Ice and Soccer in 352x288, 30 fps) for the experiments. The sequences used in the research are commonly used to assess the effectiveness of video sequence compression. The measurement of the image quality is based on the PSNR. The results of optimal selection of wavelet video codec parameters due to the coding time are presented. The main goal of the paper is to show the coder parameters that provide the best values of the PSNR for a reduced coding time.
Źródło:
International Journal of Electronics and Telecommunications; 2013, 59, 4; 341-349
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Focus Construction in Èkìtì and Oǹdó Dialects of Yorùbá: A Dialectological Perspective
Autorzy:
Akintoye, Oluwole Samuel
Owoyele, Oluwasegun Joseph
Powiązania:
https://bibliotekanauki.pl/articles/1177780.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Coding
Construction
Dialects
Focus
Prominence
Sentence
Opis:
Focus Construction in Yoruba language and its dialects has attracted the attention of many Yoruba scholars. But to the best of our knowledge, none has investigated this phenomenon in Èkìtì and Oǹdó dialects. This forms the focus of this paper. The data collection relies on the informants who are native speakers of the two dialects. They are between ages 60 to 80 and they have spent almost their life-times in the selected dialect communities. Descriptive approach is adopted for the discussion. Findings reveal that although, the two dialects belong to different Yoruba major groups; Central Yoruba and Southeast Yoruba, there are some similarities and differences in the syntax of the two dialects. These similarities and differences can mostly be reflected on their focus constructions. The concern of this paper is to consider the similarities and differences between the focus constructions in the two dialects.
Źródło:
World Scientific News; 2018, 100; 213-232
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Network-on-Multi-Chip (NoMC) with Monitoring and Debugging Support
Autorzy:
Łuczak, A.
Stępniewski, M.
Siast, J.
Domański, M.
Stankiewicz, O.
Kurc, M.
Konieczny, J.
Powiązania:
https://bibliotekanauki.pl/articles/307888.pdf
Data publikacji:
2011
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
debugging
FPGA
multi-chip
video coding
Opis:
This paper summarizes recent research on network-on-multi-chip (NoMC) at Poznań University of Technology. The proposed network architecture supports hierarchical addressing and multicast transition mode. Such an approach provides new debugging functionality hardly attainable in classical hardware testing methodology. A multicast transmission also enables real-time packet monitoring. The introduced features of NoC network allow to elaborate a model of hardware video codec that utilizes distributed processing on many FPGAs. Final performance of the designed network was assessed using a model of AVC coder and multi-FPGA platforms. In such a system, the introduced multicast transmission mode yields overall gain of bandwidth up to 30%. Moreover, synthesis results show that the basic network components designed in Verilog language are suitable and easily synthesizable for FPGA devices.
Źródło:
Journal of Telecommunications and Information Technology; 2011, 3; 81-86
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of quantization steps of time interpolator in view of temperature changes
Autorzy:
Sondej, D.
Szplet, R.
Powiązania:
https://bibliotekanauki.pl/articles/114194.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
time-digital conversion
two-stage interpolation
multi-edge coding in independent coding lines
time counter
time digitizer
Opis:
This paper presents a method of limiting the effect of ambient temperature drift on the measurement uncertainty of a time counter (TC). A change in ambient temperature causes a change in the TC transfer function, i.e. the widths of quantization steps to be exact. Recalibration is a procedure that is then required, but it disturbs the measurement process. However, with the knowledge of the current ambient temperature and having the set of transfer functions identified at different temperatures, it is possible to determine and use the most adequate transfer function and virtually eliminate the temperature impact. For this purpose, three interpolation methods were studied: the nearest neighbor method, linear and polynomial interpolations. A newly evaluated transfer functions were tested in interpolating TC to select the best interpolation method.
Źródło:
Measurement Automation Monitoring; 2017, 63, 5; 192-194
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The structure of fadL mRNA and its interactions with RybB sRNA
Autorzy:
Groszewska, Agata
Wroblewska, Zuzanna
Olejniczak, Mikolaj
Powiązania:
https://bibliotekanauki.pl/articles/1038749.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
Hfq
sRNA
mRNA
RybB
fadL
coding sequence
Opis:
Small bacterial RNAs (sRNAs) regulate translation by pairing with complementary sequences in their target mRNAs, in a process which is often dependent on the Hfq protein. Here, the secondary structure of a 95-nt long fragment of Salmonella fadL mRNA containing RybB sRNA binding site in the coding region was analyzed. The data indicated local rearrangements in this mRNA structure after the annealing of RybB. The filter retention data had shown that Hfq bound both RybB and the fadL mRNA fragment with tight affinities. Moreover, Hfq increased the rate of RybB annealing to fadL mRNA. These data indicate that Hfq directly participates in RybB interactions with the fadL mRNA.
Źródło:
Acta Biochimica Polonica; 2016, 63, 4; 835-840
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evolution of Polish Building Law 1928–1939 as an Example of Spatial Policy Development
Autorzy:
Domińczak, Michał
Powiązania:
https://bibliotekanauki.pl/articles/2168441.pdf
Data publikacji:
2021
Wydawca:
Fundacja Instytut Nauki o Polityce
Tematy:
Polish Building Law
Urban Coding
Development Plan
Opis:
The text is devoted to the evolution of construction law in the period of the Second Polish Republic as one of the tools of the broadly understood policy of the State. The basic research problem is the rationalization of regulations and their functioning in the legal system. The analysis allowed us to formulate research conclusions. The policy regarding construction law and spatial development in the Second Polish Republic was subordinated to the overarching goals, i.e. the unification of regulations in the country and building the image of a strong state by organizing space. In terms of specific objectives, the evolution of the law was aimed at rationally increasing the amount of affordable housing, strengthening co-responsibility of private entities for spatial development, smart management of available resources, and intensive support for new housing.
Źródło:
Polish Journal of Political Science; 2021, 7, 2; 81-103
2391-3991
Pojawia się w:
Polish Journal of Political Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The crosstalk between splicing of protein-coding genes and processing of microRNAs located within their introns
Autorzy:
Skorupa, K.
Sobkowiak, L.
Jarmolowski, A.
Szweykowska-Kulinska, Z.
Powiązania:
https://bibliotekanauki.pl/articles/80242.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
splicing
protein-coding gene
processing
microRNA
biogenesis
non-coding RNA
intron
bioinformatic analysis
protein complex
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 3
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanizm predykcji liniowej w zadaniu biometrycznej identyfikacji mówcy
The Mechanism of Linear Pprediction in the Task Speaker Identification
Autorzy:
TWARÓG, Bogusław
ŻESŁAWSKA, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/457373.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Rzeszowski
Tematy:
identyfikacja
biometria
rozpoznawanie mowy
LPC (linear predictive coding)
identification
biometrics
voice recognition
LPC (Linear Predictive Coding)
Opis:
W artykule przedstawiono mechanizm predykcji liniowej w zadaniu biometrycznej identyfikacji mówcy. Przedstawiono zagadnienie metody opartej na predykcji liniowej LPC (linear predictive coding). Zaprezentowano otrzymane wyniki badań zaprojektowanej aplikacji.
The article presents the linear prediction mechanism in the task of biometric identification speaker. The problems method based on linear prediction LPC (Linear Predictive Coding). Also the preliminary results has been presented too.
Źródło:
Edukacja-Technika-Informatyka; 2015, 6, 3; 271-277
2080-9069
Pojawia się w:
Edukacja-Technika-Informatyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 170

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