Temat: modulation index - Katalog OPAC zbiorów

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Tytuł:: Modeling and simulation of novel stepped DC coupled quasi Z-Multilevel Inverter for single phase systems
Autorzy:: Meenakshi, T.
Suthanthira Vanitha, N.
Powiązania:: https://bibliotekanauki.pl/articles/140968.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: multilevel inverter
shoot through
quasi Z-Source
modulation index
Opis:: This paper presents the modeling and simulation of a novel topology of quasi Z-Multilevel Inverter with stepped DC input. The proposed inverter incorporates a simple switching technique with reduced component count and is aimed at producing boosted multilevel output AC voltage. The inverter consists of two stages and the buck /boost operation is obtained by varying the shoot through period of the pulses obtained by maximum constant boost control with third harmonic injection. With all the advantages of the quasi Z-network, the proposed inverter eliminates the fly back diodes and capacitors present in a conventional Z-Multilevel Inverter. Further the stress on the devices is less which leads to reduction in component value and hence the cost. The novel stepped DC coupled Single Phase quasi Z-Multilevel Inverter is modeled and simulated in the MATLAB – SIMULINK environment and its performance is analyzed for varying input and switching conditions. The voltage and current waveforms across each stage of the inverter is analyzed and the results are presented for different levels of input.
Źródło:: Archives of Electrical Engineering; 2016, 65, 3; 437-448
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Localization of Copy-Move Forgery in Speech Signals Through Watermarking Using DCT-QIM
Autorzy:: Lalitha, N.V.
Rao, Ch. Srinivasa
Jaya-Sree, P.V.Y.
Powiązania:: https://bibliotekanauki.pl/articles/227242.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: watermarking
copy-move forgery
discrete Cosine
transform
quantization index modulation
hash bits
Opis:: Digital speech copyright protection and forgery identification are the prevalent issues in our advancing digital world. In speech forgery, voiced part of the speech signal is copied and pasted to a specific location which alters the meaning of the speech signal. Watermarking can be used to safe guard the copyrights of the owner. To detect copy-move forgeries a transform domain watermarking method is proposed. In the proposed method, watermarking is achieved through Discrete Cosine Transform (DCT) and Quantization Index Modulation (QIM) rule. Hash bits are also inserted in watermarked voice segments to detect Copy-Move Forgery (CMF) in speech signals. Proposed method is evaluated on two databases and achieved good imperceptibility. It exhibits robustness in detecting the watermark and forgeries against signal processing attacks such as resample, low-pass filtering, jittering, compression and cropping. The proposed work contributes for forensics analysis in speech signals. This proposed work also compared with the some of the state-of-art methods.
Źródło:: International Journal of Electronics and Telecommunications; 2019, 65, 3; 527-532
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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