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I will introduce and discuss probabilistic data models and their applications to auditory data and to general pattern recognition tasks. The introduction will reflect the view that powerful data models are able to extract the true compositional nature of data, which allows for a decomposition into their structural primitives. Probabilistic sparse coding and probabilistic version of non-negative matrix...
Industrial manufacturing is more and more based groups of robots in production cells. The robots consist of moving, bending and rotating arms with multiple joints. Cables that connect sections of robots undergo heavy stress from stretching and twisting, resulting in wear-out and failure. Replacing cables on robots by wireless communication therefore is an alternative that has been investigated for...
The presentation consists of two parts. In the first one, the typical signals applied for testing of electro-acoustical devices are presented. These signals are e.g: harmonic signal, slowly and quickly tuned sinusoid, impulses, Gaussian noise, Maximum Length Sequence, Golay's Complementary Sequences. The statistical and spectral properties of these signals are described. The methods of analysis of...
Classical methods for processing and analysis of multidimensional signals — such as color videos and hyperspectral images — do not exploit full information contained in inner their factors. On the other hand, recently developed tensor based methods allow for data representation and analysis which directly account for data multidimensionality. Examples can be found in many applications such as face...
This paper presents a design method of reversible integer quaternionic paraunitary filter banks (Int-Q-PUFB) using the adder-based distributed arithmetic (DAΣ) for implementation multiplier block-lifting structure modules. The proposed quaternion multiplier (Q-MUL) and 8-channel Int-Q-PUFB processors are implemented on the FPGA Xilinx Zynq 7010. The total magnitude response of analysis-synthesis system...
This paper presents the implementation of the signal processing algorithm used by buoy DIFAR (Directional Frequency Analysis and Recording), that is fully operational on Polish Navy anti-submarine warfare (ASW) helicopters and ships, applied to dipping sonars for detection and tracking of submarines. The development of the DSP algorithms was a part of the modernization of sonars conducted at the Gdansk...
Clutter reflection suppression algorithm in synthetic-aperture radar and technique of its analysis are proposed in the article. The proposed algorithm allows to increase the signal detection efficiency with closely located sources of clutter due to the use of a priori data of static objects of the infrastructure. The performance and detection characteristics are used as evaluation criteria.
The problem of a signal source or a signal receiver localization from time difference of arrival (TDOA) measurements is a crucial issue in many applications appearing in the fields of navigation, surveillance or wireless communication. In this paper we present the algorithm for finding a mutual location of both sources and receivers when the position of none of them is known. We derive an inequality...
A variety of methods exists for electroencephalographic (EEG) signals classification. In this paper, we briefly review selected methods developed for such a purpose. First, a short description of the EEG signal characteristics is provided. Then, a comparison between the selected EEG signal classification methods, based on the overview of research studies on this topic, is presented. Examples of methods...
This paper presents a study of a human-machine interface in the form of three parallel electromyographic bands placed around the user's forearm, with the influence of sEMG electrode layout on gesture recognition performance as the primary focus. Tested electrode configurations included setups ranging from 4 to 24 electrodes, with varying placement on the subject's forearm, using both monopolar and...
This paper presents a method for radial shift estimation of an electrode array located around the forearm. The algorithm is aimed at band-shaped EMG human-machine interfaces recognising hand gestures. Proposed algorithm relies on the approximation of muscle activity in several regions arranged radially around user's forearm. The intensity is represented as a polygon on a polar plane. To estimate current...
This paper presents a study on the feasibility of an interface based on a mechanomyographic signal (MMG). Existing state-of-the-art studies show attempts of utilisation of MMG signal for gesture recognition where the sensors' location is strictly defined with respect to muscle position. A test setup consisting of 5 IMU sensors arranged in a band form was used. The classifier for 5 gestures (fist,...
Noise pollution, in particular road traffic noise, is a growing concern. In general, noise reduction can be achieved at the source of noise emission, or by using anti-propagation or insulation measures. Measures at source are often the cheapest approach. This paper contributes to the development of enhanced environmentally-friendly vehicles by proposing an effective tire/road interaction noise mitigation...
The article focuses on the classification of the singing voices into their types: soprano, alto, tenor, bass. The assignment of a singing voice to a type is one of the procedures that can influence the further development of the voice. That classification is usually done by an expert experienced in the field of voice production. Improper voice classification can have a negative impact on vocal development...
The aim of the present study was frequency analysis of the recorded acoustic signal of unmanned aerial vehicle (UAV) equipped with 8 rotating propellers conducting sound level, time-frequency and discriminant function analyses. The analysis was performed to investigate sound levels of the UAV, the characteristic frequencies of the UAV, and differences between signals of the UAV at different altitudes...
A novel approach to pitch transposition is presented, which allows to preserve the spectral envelope or to modify it in a voice conversion task. Pitch-shifted output is synthesized directly from the input signal using the phase vocoder, without explicitly estimating the fundamental frequency, which is often prone to errors. Frequency band extension technique is proposed to address the problem of bandwidth...
The topic of the article is a continuation of the works about violin sound recognition. This paper shows how to achieve higher quality of recorded sound, which is closer to human's subjective perception, using signal processing and algorithms, which consider using violin playing techniques and behavior of the violinist. The filter, which provides the best result as well as perception and data analysis...
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