METHOD FOR SPECTRAL ANALYSIS OF PERIODIC MULTI-FREQUENCY SIGNALS REPRESENTED BY DIGITAL READINGS Russian patent published in 2010 - IPC G01R23/16 

FIELD: physics.

SUBSTANCE: analysed a(t_j) and reference sine b_sin0(t_i) and cosine b_cos0(t_i) signals are given by readings of instantaneous values for the same time moments t_j=t₁, t₂,…, t_N, and the sine b_sin0(t_i) and cosine b_cos0(t_i) reference signals for the given frequency ω_0k are simultaneously determined. The sine Q_sink and cosine Q_cosk area under the current versus voltage curve is determined for common solution points of a(b_sin0) and a(b_cos0). Values of amplitude A_mk, phase φ_k and frequency ω_k=ω_0k are also simultaneously recorded. The signal for setting the next frequency ω_0k+Δω is then transmitted. All operations for determining A_mk and φk are repeated until achieving ω_0k=ω_n.

EFFECT: cutting on time required for determining amplitude, frequency and phase of separate signal components.

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