O.B. Popov1, T.V. Chernysheva2, K.A. Korostelev3, K.V. Orlov4

1–4 Moscow Technical University of Communications and Informatics (Moscow, Russia)

1 olegp45@yandex.ru, 2 krba2012@yandex.ru, 3 kirill19990511@yandex.ru, 4 kvororloff@yandex.ru

Changes in the shape of the rise (attack) and fall of the amplitude of objects of the sound broadcasting signal (SBS) are especially noticeable for the listener. As is known, the transmission of only the attacks of the speech signal, which make up 15% of its duration, allows pre-serving intelligibility, and in a musical signal with eliminated attacks, even a musician cannot deter-mine the instrument on which the melody is played. The steepness of the rise of attacks determines the method of sound extraction, the recognizability of the musical signal, the intelligibility of the speech signal. Changes in the process of the rise of attacks are noticed by the listener at a duration of fractions of a millisecond. Changes in the level of the signal fall, as echo signals arrive, are determined by the reverberation of the room, and also affect the emotional coloring of the signal and are significant for the listener. Modern channels of SZV transmission significantly distort the processes of increase and decrease of its amplitude, due to the influence of numerous multiband filters used in compact representation of the signal and its audio processing. Existing methods of assessing the quality of SZV transmission assume only a subjective assessment of transient processes, which include increase and decrease of the signal amplitude. Objective methods for assessing such signal changes have not yet been proposed. The authors propose an algorithm for forming an analytical envelope of SZV, the analysis of which allows tracking changes in transient processes in the transmission channel and correcting them if necessary. An algorithm has been developed for forming a signal orthogonal to the original SZV with an error not exceeding 10-5, which allows for a comprehensive representation of the signal and the formation of its accurate analytical envelope, the analysis of the shape of which after low-frequency filtering ensures the formation of estimates of the processes of increase and decrease of objects of this envelope. The measurements carried out using the developed algorithm on real signals, including in the SZV transmission channels, confirmed the possibility of forming an objective assessment of changes in transient processes and their correction.

Popov O.B., Chernysheva T.V., Korostelev K.A., Orlov K.V. Changes in the parameters of the shape of the analytical envelope of the sound broadcasting signal in the transmission channel. Electromagnetic waves and electronic systems. 2025. V. 30. № 2. P. 20−28. DOI: https://doi.org/10.18127/j15604128-202502-02 (in Russian)

1. Kovalgin Yu.A. Digital radio broadcasting: systems and technologies. Moscow: Hotline-Telecom. 2021. 580 p. (in Russian)
2. Ntalampiras S. Automatic analysis of audiostreams in the concept drift environment. IEEE 26th International Workshop on Machine Learning for Signal Processing. 2016. P. 1–6. DOI 10.1109/MLSP.2016.7738905.
3. Abramov V.A., Popov O.B., Chernysheva T.V., Peruanskiy V.O. Increasing the Accuracy of Sound Signal Spectral Estimation According to the Properties of Hearing Analyzer.Intelligent Technologies and Electronic Devices in Vehicle and Road Transport Complex. 2021. P. 1–4.
4. Aladinsky V.A., Kuzminsky S.V., Chubatyi D.N. The choice of recognition features for low-speed speech encoding protocols. Electromagnetic waves and electronic systems. 2019. V. 24. № 8. P. 72–76. DOI 10.18127/j15604128-201908-11. (in Russian)
5. Patent for the invention RUS2773261 dated 01.06.2022. Method and device for measuring rhythmic frequencies, power and duration of declines in areas of unsteadiness of acoustic signals. Abramov V.A., Popov O.B., Vlasyuk I.V., Balobanov A.V. (in Russian)
6. Patent for the invention RUS2731339 dated 25.11.2019. Method and device for measuring the power and steepness of the rise of non-stationary acoustic signal sections. Abramov V.A., Popov O.B., Taktakishvili V.G., Ovchinnikov A.A. (in Russian)
7. Certificate of state registration of the computer program № 2022666583 dated 05.09.2022. A compander system for transmitting an audio broadcast signal via "Compander 1". Version 2022. Popov O.B., Abramov V.A., Prosecutor G.A. (in Russian)
8. Patent for the invention RUS2691122 dated 11.06.2019. Method and device for companding audio broadcast signals. Abramov V.A., Popov O.B., Orlov V.G. (in Russian)
9. Taktakishvili V., Ovchinnikov A., Popov O., Abramov V. Objective Assessment of the Quality of Transmission and Informativeness of a Speech Signal According to Statistical Parameters. Conference of Open Innovations Association, FRUCT. 2019. № 24. P. 741–746.