COMPACT METHODS FOR SUBMITTING, APPRAISING, AND PROCESSING SOUND SIGNALSBASED ON THEIR INTEGRATED PRESENTATION
Vladimir G. Taktakishvili, Moscow Technical University of communications and Informatics, Moscow, Russia, vladimir@laundrymoscow.ru
Oleg B. Popov, Moscow Technical University of communications and Informatics, Moscow, Russia, olegp45@yandex.ru
Valentin A. Abramov, Moscow Technical University of communications and Informatics, Moscow, Russia, vabramov44@mail.ru
Andrei A. Borisov, Moscow Technical University of communications and Informatics, Moscow, Russia, a.borisov199@gmail.com
Abstract
The subject of the research is a complex representation of audio signals. The purpose of the work are proposals for the development of methods of control, processing and compact presentation of sound signals on the basis of the integrated presentation. It has been shown that almost all the channels that transmit a sound signal, adaptively change their characteristics in accordance with the properties of the signal, which makes it difficult to keep its shape. Found that the algorithms used in compact view, sound processing and objective evaluation of audio quality, reached the limits, achievable with existing methods of submission signal in the temporary and frequency domains. In this regard, the urgent task is to develop new ways of presenting audio signals that are based, in particular, on the integrated presentation of the signal, allowing for the separate description and processing of such modulation options analysis (Hilbert’s) envelope, instantaneous phase and its first derivative-the instantaneous frequency. It has been shown that the main difficulties associated with the need to ensure high precision forming orthogonal signaling that is difficult for broadband acoustic signals. Found that the permissible error synthesis of orthogonal signal must not exceed 10-5. Attention is drawn to the fact that the accuracy of the synthesis of orthogonal signaling is largely determined by the correct selection of used in the FFT window function. Minimum sidelobe level of known functions has Nuttall window. However, since this window when any overlap coefficient does not provide a single transfer coefficient, you need an additional compensating function. It is shown that the representation of the sound signal in the form of analytical and cosine envelope instant phase allowed us to develop original, almost instantaneous way to regulate the levels of the audio signal, giving an opportunity to significantly enhance its relative high power without changing the dynamic range of the signal, that is unattainable for the existing analogues. The decision, which allowed the problem of occurrence of distortion when regulation is the separation of analytical baseband on low-frequency (LF) and radio frequency (RF) components. The algorithm neiskazhajushhego Companding helps reduce the level of the signal being transmitted at least twice-with the misrepresentation of the channel, i.e., to reduce its capacity by four times, at the same time OSM concise signal increase in 2.5 times. Through the use of average instantaneous frequencies allocated as a result of the integrated presentation of the audio signal, a new method of adaptive filtering. Through the use of the integrated presentation of the signal developed a way to compact the presentation of an audio signal by formation of the parameters of instantaneous frequency and amplitude envelope of Hilbert’s semi-permanent and signal variables on the first, second and third levels of the moduljacionnogo. It is shown that the use of modulation parameters in the integrated presentation of the signal allows to increase the efficiency of algorithms to objectively assess the quality of the audio signal broadcasting in tracts without saving the form, what are all modern analog and digital circuits. The results of the work aimed at the development of new methods and algorithms of control, processing and compact presentation of sound signals based on their integrated views allow you to make both theoretical and practical contributions regarding systems of formation, storage, transmission and playback of sound information signals.
Keywords: beep, the integrated presentation of the signal error orthogonal transform, Hilbert transform broadband signal, Nuttall window, the gain envelope and instantaneous frequency, instantaneous method of regulation, Companding, neiskazhajushhee way to adaptive filtering, three stages of decomposition moduljacionnogo, objective quality assessment.
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Information about authors:
Vladimir G. Taktakishvili, graduate student, Moscow Technical University of communications and Informatics, Moscow, Russia
Oleg B. Popov, Ph.d., Professor, Moscow Technical University of communications and Informatics, Moscow, Russia
Valentin A. Abramov, Ph.d., Associate Professor, Moscow Technical University of communications and Informatics, Moscow, Russia
Andrei A. Borisov, graduate student, Moscow Technical University of communications and Informatics, Moscow, Russia