Abstract: A stationary probability integrator system for facilitating spectral anals of detected signals by suppressing random frequency background noise, such as ocean disturbances and marine life, and by enhancing spectral signatures of discrete sound sources, such as generated by submarines in water. A raw 0 to 100 Hertz frequency spectrum of noise and spectral signature from a frequency analyzer having 500 increments or elements is divided into ten assemblies of 50 elements per ensemble. The ensemble averages, which are the average simultaneous energy levels of all elements in respective ensembles, of each sample is negatively combined with the energy level of each element of the corresponding ensemble of the next consecutive raw sample. Each combination and the cumulative algebraic sum of each combination is then displayed in the same frequency spectrum as the samples.

Abstract: 9. A feature recognition system for identifying an unknown signal source, mprising:First means for receiving a signal from the unknown signal source and producing a hologram thereof;Second means for receiving the hologram and for correlating it with a signal reference of known sources; andThird means associated with said second means for identifying the unknown source.