Sulima N. Improving audio quality in digital broadcasting systems by applying the combined motional feedback

An object - the process of sound reproduction by electroacoustic transducers (loudspeakers) in digital broadcasting systems. An objective is improving the quality of sound reproduction in digital audio broadcasting systems by applying to them the electromechanical feedback. Research methods: logic, methods of mathematics, theory of electrical circuits, field theory, the theory of automatic control systems, simulation, full-scale experiment, subjective study. Theoretical and practical results: Bringing theory of MFB in accordance with the provisions of the general theory of management, provides an opportunity to assess the effectiveness of the introduction of feedback. The proposed negotiation theory and the theory of feedback analysis and synthesis of loudspeakers allows them more efficient design. Improving performance analysis method improves the accuracy of the results of the loudspeakers without additional measuring equipment. Scientific novelty: first proposed method of combined MFB that allows for stability of preservation, to provide a greater depth of the feedback, and thus increase the efficiency of the feedback in the loudspeaker. First obtained mathematical expressions describing the louspeaker with MFB, which are based on a mechanical interpretation, not the method of electromechanical analogies that will accurately determine the physical meaning MFB. For the first time the relationship is obtained for the expansion of the well-known theory of Thiele-Small loudspeakers on the feedback that allow for the synthesis of reducing the volume of the loudspeakers while preserving the qualitative and quantitative characteristics. Was further developed method for measuring the characteristics of the loudspeaker using acceleration sensors to improve the accuracy of the measurement by the use of the proposed dissertation in the way of forming the electrical equivalent sound pressure as a combination of the frequency equivalents measured acceleration, velocity, and displacement of the vibrating system of the loudspeaker. Was further developed as a physical interpretation MFB electronic method affect the mechanical parameters of the loudspeakers, in particular the inertia, friction and elasticity of their mobile systems, mechanical resistance, which creates prerequisites for improving the quality and quantity of the loudspeakers without a significant change in their structures. Further developed the theory of analysis and synthesis of the loudspeakers (the theory of Thiele-Small) where as the initial parameters in the design of the loudspeakers invited to consider a set of characteristics related to MFB The results of studies are implemented in such organizations: State Enterprise "Odessa Broadcasting Center", the Odessa National Academy of Telecommunications n.a. A.S. Popov.