Возможность и целесообразность учета частотных зависимостей... 93 sult of this conversion, frequency bands lower than 500 Hz mostly affect the value of speech intelligibility; since it is in this interval that equal loudness contours are not parallel to each other. The second approach is based on the use of various function of perception coefficient calculation for each octave band suggested by A.N. Prodeus. As a result, the speech intelligibility value decreases, which needs validation, and contradicts numerous experimental results obtained earlier. These experiments reveal that in modern conditions (connected texts, a possibility of repeated listening, noise cleaning) the speech intelligibility significantly increases in comparison with N.B. Pokrovsky's results (the technique was developed for assessing the quality of communication lines). As a result, the question of the necessity to choose an approach to the accounting of the influence of frequency characteristics arises. In addition, it may be necessary to experimentally revise the dependence of the perception coefficient function on the level of perception by taking modern conditions of information security into account.

No abstract