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This paper presents the issue of a nonharmonic multitone generation with the use of singing bowls and the digital signal processors. The authors show the possibility of therapeutic applications of such multitone signals. Some known methods of the digital generation of the tone signal with the additional modulation are evaluated. Two projects of the very precise multitone generators are presented....
This paper presents the problem of measuring multitone parameters, including non harmonic sounds emitted by a particular harmonic percussion instruments belonging to the idiophones group. As examples may serve bowl sound used in the process of audio therapy. Additionally, the paper presents an original program written in MATLAB to measure important multitone parameters, such as frequency, power level...
This article presents an automatic speaker recognition system implemented in Matlab, which uses a unique feature vector, the so-called “Voice Print” (VP), to describe the voice. The system uses Gaussian Mixtures Models (GMM) in the classification process. The final part of the paper presents research on the efficiency of speaker recognition for different variants of the system, as well as the results...
The cancellation of acoustic crosstalk is employed to enhance the stereo image in mobile listening conditions. The implementation of the crosstalk cancellation algorithm in Matlab is introduced. The measurement signals and equipment are described. A practical setup employing a mobile computer and a head and torso simulator is employed. The results of the measurements provided conclusions regarding...
In a public address system, due to the amplification system, the source and loudspeaker signals are correlated. Acoustic feedback cancellation methods based on the Wiener theory present a bias in the estimate of the feedback path if no decorrelation algorithm is used. This work presents a new approach based on cepstral analysis to identify and cancel the feedback path. The only known previous cepstrum...
This talk will propose a computational approach to the concept of mobility and will discuss its existing and possible ICT implementations. Based on different psycho-cognitive human spaces introduced by B. Tversky (Stanford 2004) the mobility is considered as an interaction task, between these spaces and human beings, which has emerged during human evolution and adaptation to the environment. Therefore,...
This paper deals with the problem of processing of I-vectors in the text-independent speaker verification systems. A new generalized cosine similarity optimization technique is proposed. The optimization is performed over sets of orthogonal and diagonal matrices. Lie group techniques are used in order to obtain exact orthogonal matrix solution. The experiments have been performed using the NIST 2010...
The problem of improving efficiency of training special-type neural networks (SNN) used to create symbolic description of rules governing a set of empirical data is considered. Values of the description parameters are determined by the network training. Difficulties with the SNN learning appear mainly due to a great number of local minima encountered in this process. The learning methods we applied...
The paper presents the designed active non-contact optical sensor, as well as the system for measuring oculomotor activity. Oculomotor activity is examined in order to determine the fatigue level of the driver. In the created system, fatigue is detected by analyzing variability of the signals obtained in real-time: percentage of eyelid closure/opening, blink frequency, activity of the eyes and pupil...
An efficient implementation of the method for tracking time varying power system impedance is presented in the paper. This noninvasive method uses only voltage and current waveforms recorded at the point of common coupling. It does not use any additional disturbance sources. The base of the method is least squares algorithm performing computations in complex space using phasors of voltage and current...
In this paper we present a method for matrix inversion based on Cholesky decomposition with reduced number of operations by avoiding computation of intermediate results; further, we use fixed point simulations to compare the numerical accuracy of the method.
In the paper infinite impulse response (IIR) digital filters with linear-phase (LF IIR) for audio signal interpolator are discussed. This article presents the causal realization of LF IIR and especially the realization of LF IIR filter with overlap is considered. As the LF IIR filters are an alternative for ordinary finite impulse response (FIR) filters, a comparison of a particular design of FIR...
Video contains rich information in both the spatial and temporal domains. A single video consists of a number of frames, which are composed of a set of regions. The regions may have changed in location, scale or orientation. A salient region is defined as any region which is highly distinct from its surroundings and therefore easily found in a binary partition tree (BPT). Salient regions which are...
Identification of a dynamic model of a Mach-Zehnder amplitude optical modulator with parasitic phase modulation is discussed. An algorithm for identification is proposed and validated in an experiment.
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