This paper proposes a speech enhancement method using the multi-scales and multi-thresholds of the auditory perception wavelet transform, which is suitable for a low SNR (signal to noise ratio) environment. This method achieves the goal of noise reduction according to the threshold processing of the human ear's auditory masking effect on the auditory perception wavelet transform parameters of a speech signal. At the same time, in order to prevent high frequency loss during the process of noise suppression, we first make a voicing decision based on the speech signals. Afterwards, we process the unvoiced sound segment and the voiced sound segment according to the different thresholds and different judgments. Lastly, we perform objective and subjective tests on the enhanced speech. The results show that, compared to other spectral subtractions, our method keeps the components of unvoiced sound intact, while it suppresses the residual noise and the background noise. Thus, the enhanced speech has better clarity and intelligibility.
In this article, we study tilted fiber Bragg gratings (TFBGs) with tilt angles of 6◦ and 8◦, their transmission spectra, and spectral parameters that have a linear dependence on the refractive index of the environment. It is shown that there can be several such characteristics, such as the minimum, width and energy of the spectrum. The linear dependence of the spectrum width on the refractive index does not depend on the tilt angle. The linear dependence of the spectrum minimum is only observed for a tilt angle of 8◦. The results of this work can be used to create a sensor system based on an optical fiber.
The aim of this work is to present problems related to tinnitus symptoms, its pathogenesis, hypotheses on tinnitus causes, and therapy treatment to reduce or mask the phantom noise. In addition, the hypothesis on the existence of parasitic quantization that accompanies hearing loss has been recalled. Moreover, the paper describes a study carried out by the Authors with the application of high-frequency dither having specially formed spectral characteristics. Discussion on preliminary results obtained and conclusions are also contained.
The foregoing article is an attempt at answering the question, whether Fiodor Sologub is rightly called a eulogist of evil and an apologist of devil, as well as a God-iconoclast. For this purpose the author is trying to revise the hitherto views concerning the fi gure of God in the lyric of the Russian poet. In the effect of conducted studies it was established that the myth of Sologub, “the literary Jack the Ripper”, functioning well until today was based on unjust and often prejudicial opinions of persons from the symbolist’s generation, as well as of the later experts in literature, who ascribed to them the “crimes” committed by the protagonists of his novels (sadism, erotomania, necrophilia and Satanism). The key problem of God-iconoclasty in turn, as it has been revealed, is connected with the issue of literary mask, a play with the reader. On one hand, the poet’s God-iconoclasty is an attempt of “getting inscribed” in the creative tendency that predominated in the Russian literature of that time (the “diabolic symbolism”), on the other – it constitutes one of the stages in looking for God and the development of lyrical “I”, carrying autobiographical traits.
Coronaviruses present a considerable concern for humans and animals. The current world- wide pandemic of SARS-CoV-2 virus showed many gaps in understanding of coronaviruses spread and transmission. Because of lack of effective vaccine against SARS-CoV-2 the only preventive measures are represented by wearing protective masks and gloves thus limiting potential risk of contact with the airborne virus. Inversely, the limited time of protective function of the masks presents another drawback of their use. Therefore, the application of disinfection agent dispersed on the surface of protective masks may enhance their effectivity and safety of their application. The aim of the study was to examine the virucidal efficacy of low-concentra- ted sodium hypochlorite dispersed using ultrasonic humidifier on the surface of surgery masks. The study was conducted using SARS-CoV-2 surrogate virus, namely porcine epidemic diarrhea virus (PEDV) representing a model with similar biophysical properties and genomic structure to human coronaviruses. Five different concentrations of the disinfectant with different content of sodium hypochlorite were selected for the study. A final concentration of 0.228 g/L sodium hypochlorite effectively inactivated the PED virus and may support the biosafety of masks usage.
This article brings together two authors/two poems and makes them enter into an intertextual dialogue that involves the discourses of the new materialism (Catherine Malabou), postphenomenology (Natalie Depraz and Marc Richir) and Delphic maxims. Concepts like plasticity, transformation masks, alterations in the passage of time (chronos, kairos, aeon), subjectivity, emotional excess, and the living body are used to establish the foundations a poetic conversation, which, for all one knows, may be fortuitous or in a way preordained.