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Self-descriptiveness of a structural noise of metal currently has not been studied enough. If a metal structure is an acoustic noise source, to obtain from it data re structural components is the task of proper interpretation and processing of an experimen-tal results. As to a first approximation, average value of an amplitude of structural noise depends on the velocity of ultrasound longitudinal wave in metal and scattering coefficient. Measurements were performed on a cast iron samples in a cubical form 100x100x100 mm and with various form of graphite. Unfortunately, not all articles have two sided access. In case of molding thickness increase not always one can see the first base or even the transmitted acoustic signal on the background of the structural noise. Large scale, complex configuration, specially processed surface - these are a few reasons, excluding possibility to use shadowy and echo-impulse methods of ultrasonic check. One of the options in this situation is to use radio-engineering methods of separation of information on physics-mechanical characteristics and structure of cast iron from structural noise signal being registered. Joint reflections of structure can be taken not as noise, but as information source on the article material structure. Whole of statistical timing and frequency data (Fourier spectrum of transformation and Gabor integral of transformation, weighted fixed instant spectrum) is offered to be used to define both combined and space local characteristics, and changes of echoic from the signal structure monitoring.