Abstract: The invention relates to a programmable fast Fourier-analyzer device realized with MOS microprocessors, suitable for carrying out tasks connected with measurement, control and control engineering such as sound and vibration analysis. The frequency analyzer according to the invention contains an A/D converter, a plurality of microprocessors each, complete with a memory unit, for measurement data acquisition, calculation of the FFT and control of a cathode-ray display. Data transfer between the microprocessors is realized by repeated exchange of read and write memories between the microprocessors. The control element of the apparatus is an alphanumeric keyboard enabling the analyzer to be programmed in known program languages.