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Simulation of turbo codec
Audrlický, Luděk ; Šimša, Jan
In the contribution the results of simulation of iterative decoding of parallel concatenated convolutionally encoded binary data sequence is presented. The role of the type and the size of interleaver is shortly mentioned. The efficient number of a decoder iterations is evaluated.
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Speech spectrum smoothing by cepstrum and pseudo-cepstrum weighting
Plšek, Martin
In the paper an experimental vocal tract model of the 6.sup.th.sup. order excited by a synthetic voiced excitation signal with variable fundamental frequency is used as a testing signal for several cepstral and pseudo-cepstral smoothing approaches. The aim of the investigation is to find a reliable method for speech spectrum smoothing convenient also for female and child voices with high fundamental frequency.
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Dispersive optical bistability in unidirectional ring cavity
Šrobár, Fedor
The models of dispersive optical bistability in unidirectional ring cavity yield transmitted intensity as a function of input intensity with additional parameters /mirror reflectivity and phase shift/. There is a feedback element in the description: the dependence of the phase shift on the transmitted power. The region of physically unstable states is marked by the condition specifying that the transmission function of the feedback loop present in the representative causal diagram is greater than 1.
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