K.V. Kondratyev1, D.O. Nepomnyashchy2, A.A. Charugin3

1–3 Siberian Federal University, Institute of Space and Information Technology (Krasnoyarsk, Russia)

1 kkv@samy.ru, 2 Vebs_mail@mail.ru, 3sashacharugin@mail.ru

Creation, use and development of sound reinforcement systems, improvement of sounding and design of sound location systems is of great importance in the conditions of modern development of society and technology. However, at use and creation of such systems, difficulties are created by appearing reverberation interferences which arise as a consequence of the effect of reflection of acoustic waves from external objects. Unfortunately, such interference is poorly suppressed by hardware and circuitry solutions. This determines the need to develop new methods of noise reduction, the basis of which are the latest advances in computational microelectronics and digital signal processing.

Goal of the work: it is expedient to develop a new principle of identification and suppression of acoustic feedback, creation of echo-compensation circuit and construction of a model using a package of applied programs.

The problem of dealing with reverberation interference of voiced spaces is considered. The problem of interference extraction from the acoustic path for further analysis is singled out. It is shown that for the solution of the mentioned problems the most perspective is the use of the principle of interference subtraction from the main signal, realized on the basis of a hardware-software filter for preliminary calculation of the correction signal. The problem of increasing the accuracy of transient characteristic determination and interference signal calculation is considered. The scheme of echo-compensation is proposed, which allows to determine the vector of transient coefficients of the inverse acoustic path when averaging the results of probing influences. It is proposed to perform calculations of the transient response by the identifying signal, the frequency of which lies outside the sound range. The model of the system of identification and suppression of acoustic feedback for working out preliminary hypotheses is created in the package of applied programs MatLab–Simulink.

The proposed solution opens perspectives to creation of effective noise suppression systems.

Kondratyev K.V., Nepomnyashchy D.O., Charugin A.A. Identification of unknown dynamic system as a way to determine the transient characteristic of the inverse acoustic path. Achievements of modern radioelectronics. 2024. V. 78. № 4. P. 36–42. DOI: https://doi.org/10.18127/j20700784-202404-04 [in Russian]

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