Temat: Bark scale - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Near-Perfect Reconstruction Oversampled Nonuniform Cosine-Modulated Filter Banks Based on Frequency Warping and Subband Merging
Autorzy:: Parfieniuk, M.
Petrovsky, A.
Tematy:: allpass filter/transformation
subband/channel merging
frequency warping
critical bands
Bark scale; Pokaż więcej
Data publikacji:: 2012
Powiązania:: https://bibliotekanauki.pl/articles/227266.pdf Link otwiera się w nowym oknie
Źródło:: International Journal of Electronics and Telecommunications; 2012, 58, 2; 177-192
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Opis:: A novel method for designing near-perfect reconstruction oversampled nonuniform cosine-modulated filter banks is proposed, which combines frequency warping and subband merging, and thus offers more flexibility than known techniques. On the one hand, desirable frequency partitionings can be better approximated. On the other hand, at the price of only a small loss in partitioning accuracy, both warping strength and number of channels before merging can be adjusted so as to minimize the computational complexity of a system. In particular, the coefficient of the function behind warping can be constrained to be a negative integer power of two, so that multiplications related to allpass filtering can be replaced with more efficient binary shifts. The main idea is accompanied by some contributions to the theory of warped filter banks. Namely, group delay equalization is thoroughly investigated, and it is shown how to avoid significant aliasing by channel oversampling. Our research revolves around filter banks for perceptual processing of sound, which are required to approximate the psychoacoustic scales well and need not guarantee perfect reconstruction.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Automatic prolongation recognition in disordered speech using CWT and Kohonen network
Autorzy:: Codello, I.
Kuniszyk-Jóźkowiak, W.
Smołka, E.
Kobus, A.
Tematy:: sieć Kohonena
zaburzenia automatycznego rozpoznawania mowy
ciągła transformata falkowa
skala Barka
wydłużenie mowy
Kohonen network
automatic disorders speech recognition
waveblaster
CWT
continuous wavelet transform (CWT)
Bark scale
speech prolongations; Pokaż więcej
Data publikacji:: 2012
Powiązania:: https://bibliotekanauki.pl/articles/332965.pdf Link otwiera się w nowym oknie
Źródło:: Journal of Medical Informatics & Technologies; 2012, 20; 137-144
1642-6037
Pojawia się w:: Journal of Medical Informatics & Technologies
Opis:: Automatic disorder recognition in speech can be very helpful for the therapist while monitoring therapy progress of the patients with disordered speech. In this article we focus on prolongations. We analyze the signal using Continuous Wavelet Transform with 18 bark scales, we divide the result into vectors (using windowing) and then we pass such vectors into Kohonen network. Quite large search analysis was performed (5 variables were checked) during which, recognition above 90% was achieved. All the analysis was performed and the results were obtained using the authors' program - "WaveBlaster". It is very important that the recognition ratio above 90% was obtained by a fully automatic algorithm (without a teacher) from the continuous speech. The presented problem is part of our research aimed at creating an automatic prolongation recognition system.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Disordered sound repetition recognition in continuous speech using CWT and Kohonen network
Autorzy:: Codello, I.
Kuniszyk-Jóźkowiak, W.
Smołka, E.
Kobus, A.
Tematy:: sieć Kohonena
zaburzenia automatycznego rozpoznawania mowy
ciągła transformata falkowa
skala Barka
powtarzanie dźwięku
Kohonen network
automatic disorders speech recognition
waveblaster
CWT
continuous wavelet transform (CWT)
Bark scale
sound repetition; Pokaż więcej
Data publikacji:: 2011
Powiązania:: https://bibliotekanauki.pl/articles/333359.pdf Link otwiera się w nowym oknie
Źródło:: Journal of Medical Informatics & Technologies; 2011, 17; 123-130
1642-6037
Pojawia się w:: Journal of Medical Informatics & Technologies
Opis:: Automatic disorders recognition in speech can be very helpful for therapist while monitoring therapy progress of patients with disordered speech. This article is focused on sound repetitions. The signal is analyzed using Continuous Wavelet Transform with 16 bark scales, the result is divided into vectors and passed into Kohonen network. Finally, the Kohonen winning neuron result is put on the 3-layer perceptron. The recognition ratio was increased by about 20% by adding a modification into the Kohonen network training process as well as into CWT computation algorithm. All the analysis was performed and the results were obtained using the authors' program ”WaveBlaster“, The problem presented in this article is a part of our research work aimed at creating an automatic disordered speech recognition system.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Do czego służą badania na stałych powierzchniach w Białowieskim Parku Narodowym?
What is the use of studies carried out on the permanent plots in the Bialowieza National Park?
Autorzy:: Bobiec, A.
Tematy:: lesnictwo
ekologia lasu
Bialowieski Park Narodowy
lasy
stale powierzchnie obserwacyjne
badania naukowe
ekosystemy lesne
dynamika ekosystemow
sukcesja naturalna
szkodniki roslin
kornik drukarz
gradacja
ecological disturbances
ecological history
plots’ representativeness
spatial scale
spruce bark beetle outbreak
stand
dynamics; Pokaż więcej
Data publikacji:: 2016
Powiązania:: https://bibliotekanauki.pl/articles/1294369.pdf Link otwiera się w nowym oknie
Źródło:: Leśne Prace Badawcze; 2016, 77, 4
1732-9442
2082-8926
Pojawia się w:: Leśne Prace Badawcze
Opis:: The purpose of the strictly protected area of the Białowieża National Park (BNP) established in early 1900s, was to protect a compact block of the Białowieża forest from any direct human influence and activity. Its founders considered it a “laboratory of nature.” In 1936, five rectangular plots with a total area of ca. 15.5 ha (ca. 0.3% of the BNP) were set up for regular monitoring of stand development with regards to the initial state and variability of soil conditions. During the first 76 years of the project, a steady increase in the proportion of hornbeam and lime tree at the expense of shade-intolerant species was observed. This trend has been interpreted by the researchers involved in the monitoring of the permanent BNP plots to constitute a biodiversity-threatening development caused by preservation efforts. Such an interpretation has been widely incorporated in the public debate by political authorities and the forestry sector. In this critical article I challenge the major arguments presented by the key expert in silviculture, prof. B. Brzeziecki. My criticism is directed at the methodological approach as well as at the data interpretation.
Dostawca treści:: Biblioteka Nauki

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