Number of found documents: 623
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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; kabelová televize 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

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; syntéza řeči 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; syntéza řeči 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

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; polovodičové součástky; nanostruktury; senzory 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

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; syntéza řeči 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

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; krystaly; Země 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

Control system of the Heat Flux furnace
Kostka, František; Zelinka, Jiří; Kostka, Petr; Houška, Zdeněk; Zavadil, Jiří; Starý, Robert; Krechler, Jindřich; Žďánský, Karel
2008 - English
A control system for a two-crucible furnace for DTA has been designed and realized. Samples of heavy metal oxide glasses have been analysed by the system. Keywords: control systems; Furnace; Differential thermal analysis; regulované systémy Available at various institutes of the ASCR
Control system of the Heat Flux furnace

A control system for a two-crucible furnace for DTA has been designed and realized. Samples of heavy metal oxide glasses have been analysed by the system.

Kostka, František; Zelinka, Jiří; Kostka, Petr; Houška, Zdeněk; Zavadil, Jiří; Starý, Robert; Krechler, Jindřich; Žďánský, Karel
Ústav fotoniky a elektroniky, 2008

LPE Growth of III-V Semiconductors from rare-earth Treated Melts
Grym, Jan; Procházková, Olga; Zavadil, Jiří; Žďánský, Karel
2008 - English
We focus on the characterization of InP and InGaAsP layers prepared by liquid phase epitaxy with rare-earth admixtures. We applied photoluminescence spectroscopy (PL), capacitance-voltage measurements, and secondary ion mass spectroscopy in order to explain: (i) the gettering effect and conductivity crossover of InP layers for Pr treated samples, (ii) narrowing of the PL and elecroluminescent spectra of the active InGaAsP region of a double-heterostructure LED. Keywords: semiconductor technology; rare earth elements; III-V semiconductors; polovodiče; Země Available at various institutes of the ASCR
LPE Growth of III-V Semiconductors from rare-earth Treated Melts

We focus on the characterization of InP and InGaAsP layers prepared by liquid phase epitaxy with rare-earth admixtures. We applied photoluminescence spectroscopy (PL), capacitance-voltage ...

Grym, Jan; Procházková, Olga; Zavadil, Jiří; Žďánský, Karel
Ústav fotoniky a elektroniky, 2008

Measurement of electrical and mechanical oscillations of yeast cells membrane in acoustic frequency range
Jelínek, František; Pokorný, Jiří; Vaniš, Jan; Hašek, Jiří; Šimša, Jan
2008 - English
The paper describes the measurement of electric activity of yeast cells at frequencies around 1 kHz and of mechanical vibrations of cell membrane. Synchronized and non-synchronized tubulin mutants of yeast cells were measured. The paper includes a description of the laboratory equipment with a platinum wire point sensor and a spectrum analyzer. Obtained results are in good agreement with AFM findings. Keywords: Cellular Biophysics; Electromagnetic Fields; buňky; laboratorní zařízení Available at various institutes of the ASCR
Measurement of electrical and mechanical oscillations of yeast cells membrane in acoustic frequency range

The paper describes the measurement of electric activity of yeast cells at frequencies around 1 kHz and of mechanical vibrations of cell membrane. Synchronized and non-synchronized tubulin mutants of ...

Jelínek, František; Pokorný, Jiří; Vaniš, Jan; Hašek, Jiří; Šimša, Jan
Ústav fotoniky a elektroniky, 2008

Introduction to confocal microscopy, 3D imaging with Leica SPE
Pala, Jan; Krist, P.; Sendrowski, P.
2008 - English
Článek pojednává o současném stavu konfokální mikroskopie. The article deals with the contemporary state of art of confocal microscopy. Keywords: microscopy; diffraction; laser beams; mikroskopie Available at various institutes of the ASCR
Introduction to confocal microscopy, 3D imaging with Leica SPE

Článek pojednává o současném stavu konfokální mikroskopie.


The article deals with the contemporary state of art of confocal microscopy.

Pala, Jan; Krist, P.; Sendrowski, P.
Ústav fotoniky a elektroniky, 2008

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