Identification of instantaneous signals of verbal communications

Abstract

The quality of information perceived by hearing is one of the most important conditions to ensure reliability of interaction of elements in a biotechnical system. Recognition of information contained in a perceived acoustic signal is defined by resolution and evaluation ability of a person's hearing. This is a response modulated by phase and tonal type neurons to an acoustic stimulus of p, sound pressure and time t duration. It is common in verbal communications a 500 ms duration and pt>po audibility limit defining sound pressure with respect to acoustic intensity of a signal. For a human resolution and evaluation ability of instantaneous acoustic signals, the following dependence of p,, pt and r values is used: AL = 20lg(pt/pt)= -20k-lg(1-expt/r), where k is the index that defines characteristics of electric stimulation and temporal accumulation of neurons' modulated signal (measure of psychological status with respect to acoustic stimulus). The objective was to estimate strength of correlation relationship (or degree of incoherence with these parameters) of k index and p,, t parameters. Analysis was performed to find intersection points of functional dependences Pt=f(t) when pt=const and pT=f(t), analysis when pt=const. They were defined by calculated AL individual r duration moments from data of an experimental evaluation, i.e. provided by listeners, indicating which sound is ,,louder" and which is ,,lower". The statistically processed responses of the listeners demonstrate that the psychological status of a person is more favorable while changing standard acoustic signals of longer duration. These characteristics also indicate that according to calculation k(pt)>k(pt), there is no correlation relationship between this index and the instantaneous acoustic signal strength pT