Abstract: The subject of the paper is the application of digital signal processing (DSP) to nonlinear hydroacoustic, acoustic and mechanic phenomena investigations. To provide such investigations a spectrum analyser with additional functions of polyspectra and virtual input channel is proposed. A serial number instruments and systems has been created on the base of development of the complexes which can evaluate the above mentioned high order spectra for analysing hydroacoustic and hydrophysical signals or electromagnetic signals of navy objects. Several modes ot the analysers architecture are accomplish in our Institutes: full hardware with build-in microcomputer, external device interfaced with PC and base on 16-bit Analog Devices δ-∑ codec^TM environment mount in PC which works in DOS or Windows^TM mode. These complexes were used for development the testing environment for navy polygons and may be use in navy system of the barrier defence.