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Institution

St. Petersburg State University of Telecommunications

EducationSaint Petersburg, Russia
About: St. Petersburg State University of Telecommunications is a education organization based out in Saint Petersburg, Russia. It is known for research contribution in the topics: Computer science & The Internet. The organization has 408 authors who have published 465 publications receiving 2160 citations.


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Posted ContentDOI
TL;DR: The authors have implemented two commercial-style synthesizers as VST plug-ins using the Csound front-end "Cabbage" to fill the gap in quality reproductions of well-known synthesizers.
Abstract: For more than the past twenty years, Csound has been one of the leaders in the world of the computer music research, implementing innovative synthesis methods and making them available beyond the academic environments from which they often arise, and into the hands of musicians and sound designers throughout the world. In its present state, Csound offers an efficient environment for sound experimentation, allowing the user to work with almost any known sound synthesis or signal processing method through its vast collection of ready-made opcodes. But despite all this potential, the shared resource of Csound instruments still lacks quality reproductions of well-known synthesizers; even with its ability to generate commercial standard user interfaces and with the possibility to compile Csound instruments in such as fashion so that they can be used with no knowledge of Csound code. To fill this gap, the authors have implemented two commercial-style synthesizers as VST plug-ins using the Csound front-end "Cabbage". This paper describes their architecture and some of the Csound specific challenges involved in the development of fully featured synthesizers.

2 citations

Journal ArticleDOI
TL;DR: In this article, features of registration of a nuclear magnetic resonance (NMR) signal in a weak magnetic field from a small volume of a condensed medium (less than 0.2 mL) using a modulation technique were considered.
Abstract: We considered features of registration of a nuclear magnetic resonance (NMR) signal in a weak magnetic field from a small volume of a condensed medium (less than 0.2 mL) using a modulation technique. The relationships between the parameters of modulation field Hm and fm, generation field H1 of the autodyne detector, and the degree of inhomogeneity of magnetic field H0 for recording the NMR signal from the investigated medium with a signal-to-noise ratio of at least 1.3 are determined. To expand the functionality of the small-sized NMR spectrometer, a new design of the magnetic system was developed and implemented using step inserts made of soft magnetic material.

2 citations

Journal ArticleDOI
TL;DR: In this paper, a semi-fragile watermarking system for digital images tolerant to JPEG/JPEG2000 compression is proposed, which uses image finite differences and 3-bit quantization as the main technique.
Abstract: There is a great adventure of watermarking usage in the context of conventional authentication since it does not require additional storage space for supplementary metadata. However, JPEG compression, being a conventional method to compress images, leads to exact authentication breaking. We discuss a semi-fragile watermarking system for digital images tolerant to JPEG/JPEG2000 compression. Recently we have published a selective authentication method based on Zernike moments. But unfortunately it has large computational complexity and not sufficiently good detection of small image modifications. In the current paper it is proposed (in contrast to Zernike moments approach) the usage of image finite differences and 3-bit quantization as the main technique. In order to embed watermark (WM) into the image, some areas of the Haar wavelet transform coefficients are used. Simulation results show a good resistance of this method to JPEG compression with CR≤30% (Compression Ratio), high probability of small image modification recognition, image quality assessments PSNR≥40 dB (Peak signal-to-noise ratio) and SSIM≥0.98 (Structural Similarity Index Measure) after embedding and lower computation complexity of WM embedding and extraction. All these properties qualify this approach as effective.

2 citations

Journal ArticleDOI
TL;DR: In this article, the scattering of electromagnetic waves by a dielectric impediment in 2D geometry is studied, where the impediment is determined by an inhomogeneous component of the refractive index in the Helmholtz equation.
Abstract: In this research, we study the scattering of electromagnetic waves by a dielectric impediment in 2D geometry. The impediment is determined by an inhomogeneous component of the refractive index in the Helmholtz equation. It is assumed that the characteristic gauge of one of the two impediment sizes is much lesser than the length of waves generated by a monochromatic point source. Nevertheless, the structure of the impediment is taken into consideration in the process of calculating the scattered field. The scattered field is defined by a derived model integral equation the unique solvability of which is proved.

2 citations

Proceedings ArticleDOI
01 Jun 2019
TL;DR: In this article, the generalized Chebyshev polynomials (GCPs) were introduced, where the coefficients of the connection coefficients were derived from the recurrence relations defined by the GCPs.
Abstract: We consider special linear combinations of classical Chebyshev polynomials (of the 2nd kind) generating a class of polynomials related to “local perturbations” of the coefficients of the discrete Schrodinger equation. These polynomials are called the generalized Chebyshev polynomials. Namely, we find an explicit expression of the coefficients of this linear combination (connection coefficients) using the coefficients of the recurrence relations defining generalized Chebyshev polynomials. This report is a continuation of authors’ work [1].

2 citations


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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20231
202211
202157
202083
201982
201873