1999/4

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Recent Submissions

Now showing 1 - 5 of 8
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    Neural Network Based Speech Enhancement
    (Společnost pro radioelektronické inženýrství, 1999-12) Tlucak, J.; Juhar, J.; Dobos, L.; Cizmar, A.
    This paper deals with methods of speech enhancement with particular focus on neural speech enhancement. Speech enhancement is concerned with the neural processing of noisy speech to improve the quality and intelligibility of the speech signal. The goal of this paper is to describe an experiment with implementation of two channel adaptive noise canceler via direct time domain mapping approach.
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    2-D Motion Estimation of Video Sequences with Influnce of Zero-Mean Gaussian Noise
    (Společnost pro radioelektronické inženýrství, 1999-12) Usama, S.; Simak, B.; Klima, M.
    This paper presents the performance of four motion estimation algorithms with present of zero-mean Gaussian noise. The performance of full search (FS) algorithm, three-step search (TSS) algorithm, new three-step search (NTSS) algorithm, and four-step search (4SS) algorithm with influence of Gaussian noise has been described for three of famous video sequences. The critical signal-to-noise ratio (SNR) is introduced for each algorithm. The worst performance is often in case of full search algorithm (FS).
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    High-Level Analogue Fault Simulation Using Linear and Non-Linear Models
    (Společnost pro radioelektronické inženýrství, 1999-12) Bartsch, E. K.; Bell, I.
    A novel method for analogue high-level fault simulation (HLFS) using linear and non-linear high-level fault models is presented. Our approach uses automated fault model synthesis and automated model selection for fault simulation. A speed up compared with transistor-level fault simulation can be achieved, whilst retaining both behavioural and fault coverage accuracy. The suggested method was verified in detail using short faults in a 10k state variable bandpass filter.
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    An Effective Go-Back-N Automatic-Repeat-Request Scheme for Variable-Error-Rate Channels
    (Společnost pro radioelektronické inženýrství, 1999-12) Kosut, P.; Polec, J.; Diaz, P.; Menhart, P.
    In non stationary channels, error rates vary considerably. This paper proposes an effective go-back-N (GBN) Automatic-Repeat-Request (ARQ) scheme which estimates the channel state in a simple manner, and adaptively switches its operation mode. It provides higher throughput than other comparable ARQ schemes in conditions of Land-Mobile-Satellite (LMS) channel.
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    Design, Simulation and Realization of a Dual-Mode Oscillator with Distributed RC Structure
    (Společnost pro radioelektronické inženýrství, 1999-12) Oweis, R.; Minarik, M.
    This submission dealt with the design, simulation and realisation of a dual mode oscillator with distributed RC structures that use AT-cut quartz resonator as stabilisation element and sensor element of its own temperature. Simulations, experimental results and evaluation of the short-term stability are also included.