METHOD FOR SIMULTANEOUS MEASUREMENT OF SPEECH INTELLIGIBILITY OF SEVERAL SOURCES Russian patent published in 2019 - IPC H04R29/00 

FIELD: optics.

SUBSTANCE: invention relates to acoustic metrology, particularly to instruments for determining speech intelligibility. According to the method, optical fibres are laid, divided into measuring sections, connected to a measuring module, a signal is emitted, the maximum length of return of the reflected signal is used to determine the length of the fibre, and the period T of measuring pulse signals is calculated. Receiver receives an acoustically modulated sequence of reflected measuring pulses, demodulates the acoustic component of the received reflected measuring pulse signals, and measures the level of natural noise. M sources of signals are then placed, and N frequencies of acoustic signals are sequentially transmitted by each of the M sources. Radiation frequencies are distributed over the average frequencies N of the bands, receiving the signals, calculating the signal/noise ratio, constructing a variation series of signal/noise ratio values, selecting a leading term of the variation series, characterizing variation of individual features of a source of acoustic test signals is picked up and memorized. Then, acoustic signals are emitted simultaneously, signal-to-noise ratio is measured, a row is constructed. Level of speech intelligibility is calculated from the senior member of the variation series of each of M sources of acoustic test signals.

EFFECT: technical result is shorter time and high accuracy of simultaneous measurement of speech intelligibility.

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