Scientific Journal Problems of Emergency Situations - S. Cheberiachko, Yu. Cheberiachko, D. Radchuk, O. Deryugin, O .Sharovatova, T. Lutsenko. Influence of filter respirators on speech reasonability. P. 219-232.

The deterioration of the intelligibility of the words was determined during communication by mobile phone of the speakers in the filter respirator. There were 20 speakers graduates (male and female) aged 18 to 22 years who had participated in the research. They took turns in the room with a mobile phone and a laptop. The random words was appeared on the screen of devices which speakers in a filter respirator, told the listener in another room by a mobile phone located at a certain distance and near the ear. Hearing the word, the listener repeated it on the phone. Additionally, the following were controlled: the volume of the speech – with a noise level meter and the distance of the phone from the speaker – with a ruler. It was found that in the presented models of filter respirator the impact on the speech process is insignificant and ranges from statistical error from 2 % to 11 %. It is depend on the density of filter layers of materials and the degree of adhesion of the filter respirator to the user's face, which can affect facial expressions. Clarified when the volume of speech increases, their intelligibility increases too, but on the level of 70 dB it destabilizes and almost does not change. Studies have testified, when the rate of speech slows down twice, the intelligibility of participant´s language which using filter respirator improves to 5 %. There are some recommendations for improving speech intelligibility during communicating by mobile phone using a filter respirator.

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