Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back Approximation and calculation methods for the spectrum of short processes, signals and functions Dmitriev E.V. The article presents a brand new characteristic for the short processes named spectrum; its features are described. The decom-position possibility of the short discrete and continuous processes into a finite harmonic sequence is stated. A method of effec-tive approximation used for spectrum estimation is described. Контактный телефон (4732) 47-85-84. E-mail: kvsj3903@yandex.ru.