SU123769A1 - An instrument for determining spectral density from a correlation function - Google Patents

Description

Known mechanical spectrographs require the continuous participation of the operator.

New in the proposed instrument is the complete automation of the process of determining the spectral density, as well as the formation of signals for input into the counting part of the instrument, i.e. that the program in the form of harmonics of various frequencies is introduced into the instrument by playing back recordings from magnetic tape. . The principle of operation of the device is as follows. The correlated cyopic function recorded on a ring by a magitta tape is repeatedly replayed and fed into the multiplexed repetitive block, which is used by the instrument in the required phase with harmonics of certain frequencies that are entered from the program recorded on the magnetic tape. The spectral density calculated in the instrument (on the integrator) is automatically recorded in the form of a curve constructed in a rectangular coordinate system.

The block diagram of the device led in the drawing.

A correlation function is applied to the input of the recording unit 1 in the form of an electrical connection. This unit converts the input voltage into a modulated signal, and magnetic head 2 fixes it on a moving magnetic 3. On the same tape before recording the function, an auxiliary pulse of large amplitude is recorded with a duration of about 0.5 sec. The cosypusoid of various frequencies and K0 mandates in the intervals between them are fed to the input of the block 4. In a similar manner to those produced in the block /, cosinchoids are fixed by head 5 on tape 6. The recorded signals and cosinusoids are reproduced by the same heads 2 and 5, respectively. In playback units 7 and S, the signals are amplified and demodulated in voltages, an ;; logical in form from the pa inputs to the corresponding recording units. Further POST signals