In given paper fluctuations of intensity of sound signals, radiated by the midfrequency source (R/V Knorr) during ~5h were studied. Broadband signals (2-8 kHz) were received by four single hydrophones fixed at the bottom (SHRUs) placed at different distances from the source (from 4 to 12 km). These four acoustic tracks have different directions relative direction of propagation of the train of intensive internal waves (the corresponding angles in horizontal plane are from ~5 to ~15°). Time-frequency diagrams were constructed using fequency filtering of the spectrum of broadband signals with sliding narrow window. Temporal dependeces of intensities of received signals within frequency window were constructed for period 14:00 until 19:00 GMT for experiment carried out on 13 August. During this time train of internal solitons was registered, propagating toward the coast. Mentioned time-frequency diagrams demonstrate specific features of influence of internal waves on the temporal variaons of the sound intensities at four SHRUs. More exactly variations of predominating frequency in spectra correspond to variations of positions of the solitons at the acoustic tracks. Results of experimental data are compared with theoretical estimations.

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