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Microsystems, Electronics and Acoustics
ISSN 2523-4447 · e‑ISSN 2523-4455 Open Access · CC BY-SA 4.0
Vol. 25 · Issue 1 · 2020 Jul 6, 2020 Acoustical devices and systems

Artificial Software Complex "Artificial Head". Part 1 Adjusting the Frequency Response of the Path

OD
Olexandr Oleksandrovych Dvornyk Corresponding Національний технічний університет України "Київський політехнічний інститут імені Ігоря Сікорського" Ukraine
DM
Daria Ievheniivna Motorniuk Національний технічний університет України "Київський політехнічний інститут імені Ігоря Сікорського" Ukraine
MD
Marina Vitaliivna Didkovska Національний технічний університет України "Київський політехнічний інститут імені Ігоря Сікорського" Ukraine
AP
Arkadii Mykolaiovych Prodeus Національний технічний університет України "Київський політехнічний інститут імені Ігоря Сікорського" Ukraine
Pages56-64 PublishedJul 6, 2020
PDF (Ukrainian)
VOL 25 · ISS 1 · 2020 View issue

Abstract

In this paper, the technology of correction of the frequency response of the measuring path of the hardware-software complex "Artificial head", intended for acoustic examination of the rooms, has been developed. This correction is necessary because the amplitude-frequency response of the loudspeaker and the microphone are not perfectly uniform in the frequency band of analysis. Therefore, instead of the room impulse response, the convolution of the room impulse response with the impulse responses of the loudspeaker (test signal source) and the microphone will actually be evaluated. It is shown that such correction can be made by controlled dividing the frequency response of the loudspeaker-room-microphone system by the previously obtained estimate of the amplitude-frequency response of the loudspeaker-microphone subsystem. The problem with such calculations is the division operation, because the amplitude-frequency response of the loudspeaker-microphone subsystem may contain small numerical values, which will overflow the discharge grid of the computing system and crash the computer. However, it is clear that if proper control over the amplitude-frequency characteristics of the loudspeaker-microphone subsystem is ensured, such a division can be practically implemented. Since the amplitude-frequency response of the subsystem "loudspeaker-microphone" takes the smallest values at the edges of the frequency range, and the variance of the evaluation of the mutual spectrum of the system "loudspeaker-room-microphone" is the largest on the right edge of the frequency range, it is advisable to apply the method of regularization to achieve necessary calculation accuracy. In this case, the role of the regularizing factor can be played by a spectral weighting window whose values are close to one at low and medium frequencies, and with the approaching to the right edge of the frequency range, the values of this window are close to zero. The role of the regularization parameter is thus the width of such a weighting window. The nature and value of such correction effect on the accuracy of the room impulse response estimate are analyzed in this paper. It is shown that the Hann (Hanning) window can be used as a regularizing factor, while the width value of this window was experimentally found, which provides satisfactory properties for evaluating the room impulse response. It has been also shown that the width of the Hann window, which is close to 80% of the total frequency range analyzed, is satisfactory for practical applications.

Keywords

#artificial head #frequency response #correction #room impulse response #estimation

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