A complex algorithm for objective evaluation of the decoded speech signal quality under the action of acoustic interference

The paper presents algorithms for objective evaluation of speech quality are considered, based on the measurement of dynamic and static characteristics of speech signals at the source codec output. The functional scheme of carrying out of experimental researches is proved. The results of the analysis of the correlation of objective and subjective evaluation of speech quality are given. Modifications of the objective quality assessment are proposed on the basis of the correlation of the excitation of the MESC spectrum and modification of the exponent on the basis of the calculation of the sensation function of the spectral dynamics of MFOSD. The algorithm of regression curve formation is proposed, which allows to perform the transformation of objective evaluation to the scale of subjective evaluation of speech quality.
Based on the use of the most accurate modifications of the speech quality assessment indicators for reconstructed speech signals, a complex algorithm for objective hardware evaluation of the speech quality is proposed when the broadband and low-frequency stationary and nonstationary acoustic waves are applied to the microphone. It is shown that the use of a complex algorithm makes it possible to obtain an objective evaluation of the quality of speech according to GOST R 50840-95 with an average error of no more than 0.35 points for signal-to-noise ratios of 30 dB to -10 dB.