Number of found documents: 627
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Wide view of broadband in the CR
Kuchar, Anton
2009 - English
Situation in construction and operation of broadband acces networks in the Czech Republic is described from a broader perspective. Keywords: optical communication; Wireless communication; Cable television Available at various institutes of the ASCR
Wide view of broadband in the CR

Situation in construction and operation of broadband acces networks in the Czech Republic is described from a broader perspective.

Kuchar, Anton
Ústav fotoniky a elektroniky, 2009

Optické mikroresonátory pro sensory a komunikace
Todorov, Filip; Matějec, Vlastimil; Chomát, Miroslav; Berková, Daniela; Jelínek, M.; Kubeček, V.; Sedlář, R.
2009 - Czech
Příspěvek se zabývá optickými mikroresonátory, jejich přípravou, vlastnostmi a využitím v telekomunikacích a zejména v senzorech. Jsou uvedeny výsledky získané s přípravou a charakterizací kulových křemenných mikroresonátorů na pracovištích autorů. The paper deals with optical microresonators, their preparation, characteristics and application to telecommunication and sensor purposes. Results in the preparation and characterization of spherical silica resonators achieved by the authors are presented. Keywords: communications; sensing; optical microresonator Available at various institutes of the ASCR
Optické mikroresonátory pro sensory a komunikace

Příspěvek se zabývá optickými mikroresonátory, jejich přípravou, vlastnostmi a využitím v telekomunikacích a zejména v senzorech. Jsou uvedeny výsledky získané s přípravou a charakterizací kulových ...

Todorov, Filip; Matějec, Vlastimil; Chomát, Miroslav; Berková, Daniela; Jelínek, M.; Kubeček, V.; Sedlář, R.
Ústav fotoniky a elektroniky, 2009

The role of small and medium CATV operators in providing e-services in the Czech Republic
Kuchar, Anton
2009 - English
As the demand for broadband e-services is increasing, there is a good chance for the cable TV operators to successfully compete with the traditional telecommunication operators in providing the services taking advantage of their broadband infrastructure. The paper reviews the Czech telecommunications arena focusing on the role of CATV operators and service providers in general and of the small and medium ones in particular. Keywords: Telecommunication networks; Optical communication; Cable television Available at various institutes of the ASCR
The role of small and medium CATV operators in providing e-services in the Czech Republic

As the demand for broadband e-services is increasing, there is a good chance for the cable TV operators to successfully compete with the traditional telecommunication operators in providing the ...

Kuchar, Anton
Ústav fotoniky a elektroniky, 2009

The role of small and medium CATV operators in providing e-services in the Czech Republic
Kuchar, Anton; Klíma, P.
2009 - English
As the demand for broadband e-services is increasing, there is a good chance for the cable TV operators to successfully compete with the traditional telecommunication operators in providing the services taking advantage of their broadband infrastructure. The paper reviews the Czech telecommunications arena focusing on the role of CATV operators and service providers in general and of the small and medium ones in particular. Keywords: Telecommunication networks; Optical communication; Cable television Available at various institutes of the ASCR
The role of small and medium CATV operators in providing e-services in the Czech Republic

As the demand for broadband e-services is increasing, there is a good chance for the cable TV operators to successfully compete with the traditional telecommunication operators in providing the ...

Kuchar, Anton; Klíma, P.
Ústav fotoniky a elektroniky, 2009

ŘEČ A POČITAČ Principy hlasové komunikace,úlohy, metody a aplikace
Nouza, J.; Koldovský, Z.; Vích, Robert
2009 - Czech
The aim of the proceedings is to supply a detailed insight into computer speech processing. The publication results in the framework of the program „Support of the targeted research“ at the AS CR, in the project „Assistance, information and communication services based on advanced voice technology“. Keywords: speech analysis; Speech synthesis Available at various institutes of the ASCR
ŘEČ A POČITAČ Principy hlasové komunikace,úlohy, metody a aplikace

The aim of the proceedings is to supply a detailed insight into computer speech processing. The publication results in the framework of the program „Support of the targeted research“ at the AS CR, in ...

Nouza, J.; Koldovský, Z.; Vích, Robert
Ústav fotoniky a elektroniky, 2009

COMPARISON OF SPEECH VOCODERS BASED ON REAL AND COMPLEX CEPSTRAL COEFFICIENTS
Staněk, Jan; Vondra, Martin
2009 - English
New approach to speech analysis and synthesis using the complex cepstral coefficients was implemented in a form of a vocoder based on complex cepstral coefficients. To test the results of this new vocoder a comparison with results of an existing vocoder based on real cepstral coefficients were done. This paper describes the structure of both vocoders and the results of performed tests. Keywords: speech synthesis Available at various institutes of the ASCR
COMPARISON OF SPEECH VOCODERS BASED ON REAL AND COMPLEX CEPSTRAL COEFFICIENTS

New approach to speech analysis and synthesis using the complex cepstral coefficients was implemented in a form of a vocoder based on complex cepstral coefficients. To test the results of this new ...

Staněk, Jan; Vondra, Martin
Ústav fotoniky a elektroniky, 2009

Speech processing
Vích, Robert
2009 - English
Proceedings of the Workshop on Speech Processing is a periodic publication collecting the contributions presented at the Czech-German Workshop organized every year in September in Prague This proceedings volume includes 22 papers by 45 authors. Papers are devoted to phonetics and prosody, construction of dialogs, speech analysis, synthesis and enhancement, speaker and speech recognition and voice conversion. Keywords: speech analysis; Speech synthesis Available at various institutes of the ASCR
Speech processing

Proceedings of the Workshop on Speech Processing is a periodic publication collecting the contributions presented at the Czech-German Workshop organized every year in September in Prague This ...

Vích, Robert
Ústav fotoniky a elektroniky, 2009

Nové principy syntézy řeči
Horák, Petr; Chaloupka, Zdeněk; Vích, Robert; Vondra, Martin; Staněk, Jan
2009 - Czech
Kapitola sborníku popisuje volně šířitelný software pro syntézu řeči z psaného textu Epos, dále se zabývá dokonalejším modelováním prozodie a uvádí nové kepstrální modelování řeči s využitím komplexního kepstra. The chapter of the proceedings describes the free software for text-to-speech synthesis Epos, deals with improved prosody modeling and presents new cepstral speech modeling using the complex cepstrum. Keywords: speech analysis; Speech synthesis Available at various institutes of the ASCR
Nové principy syntézy řeči

Kapitola sborníku popisuje volně šířitelný software pro syntézu řeči z psaného textu Epos, dále se zabývá dokonalejším modelováním prozodie a uvádí nové kepstrální modelování řeči s využitím ...

Horák, Petr; Chaloupka, Zdeněk; Vích, Robert; Vondra, Martin; Staněk, Jan
Ústav fotoniky a elektroniky, 2009

Films of Metal Nanoparticles Deposited on Semiconductors by Electrophoresis: Technology and Characterization
Žďánský, Karel; Zavadil, Jiří; Kacerovský, Pavel; Kostka, František; Lorinčík, Jan; Černohorský, O.; Fojtík, A.; Müller, M.; Kostejn, M.
2009 - English
Layers of nanoparticles in micelle enclosures were deposited on InP substrates by electrophoresis from isooctane colloid solutions containing Pd or Ag nanoparticles. The layers were investigated by SIMS, low-temperature photoluminescence spectroscopy and topography, absorption spectroscopy, Raman spectroscopy and sensitivity to hydrogen. Photoluminescence of InP was enhanced by the layers of Pd or Ag nanoparticles. Schottky barriers made on the n-type InP with layers containing Pd nanoparticles showed significant sensitivity to hydrogen in contrast to those containing Ag nanoparticles. Keywords: semiconductor devices; nanostructures; sensors Available at various institutes of the ASCR
Films of Metal Nanoparticles Deposited on Semiconductors by Electrophoresis: Technology and Characterization

Layers of nanoparticles in micelle enclosures were deposited on InP substrates by electrophoresis from isooctane colloid solutions containing Pd or Ag nanoparticles. The layers were investigated by ...

Žďánský, Karel; Zavadil, Jiří; Kacerovský, Pavel; Kostka, František; Lorinčík, Jan; Černohorský, O.; Fojtík, A.; Müller, M.; Kostejn, M.
Ústav fotoniky a elektroniky, 2009

GROWTH OF InP CRYSTALS WITH RARE-EARTH ELEMENTS
Yatskiv, Roman; Grym, Jan; Žďánský, Karel; Pekárek, Ladislav; Zavadil, Jiří
2009 - English
We report on the influence of rare earth (RE) elements (Pr, Er, and Dy) addition during vertical Bridgman low pressure synthesis on the properties of InP crystals. The temperature dependent Hall measurement and low temperature photoluminescence (PL) spectroscopy were employed to study the changes in electrical and optical properties of the crystals. The observed changes are attributed to the gettering effect of REs caused by the high affinity of REs towards shallow impurities in InP. Keywords: Rare-earth elements; Crystals growth; InP Available at various institutes of the ASCR
GROWTH OF InP CRYSTALS WITH RARE-EARTH ELEMENTS

We report on the influence of rare earth (RE) elements (Pr, Er, and Dy) addition during vertical Bridgman low pressure synthesis on the properties of InP crystals. The temperature dependent Hall ...

Yatskiv, Roman; Grym, Jan; Žďánský, Karel; Pekárek, Ladislav; Zavadil, Jiří
Ústav fotoniky a elektroniky, 2009

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