METHOD OF SHORT-TERM SPECTRAL ANALYSIS OF QUASI-STATIONARY SIGNALS

摘要

FIELD: measuring equipment.;SUBSTANCE: invention relates to measuring equipment and is intended for determining the frequencies and amplitudes of multicomponent non-stationary signals. Method of short-term spectral analysis is proposed in which errors due to overlapping of the band-pass filter (BPF) characteristics when using a set with overlapping frequency characteristics, amplitude detectors (AD) and low-pass filters (LPF) are eliminated by subtracting the correction signal A₂(f_i,t) from the LPF output signals A₁(f_i,t). Correction signal A₂(f_i,t) is calculated as the sum of the contributions to the i-th channel of the adjacent j = i±m channels with weighting coefficients LPF time constant τ is increased so as to maintain the required relative ripple level in the difference signal A₁(f_i,t)-A₂(f_j.t). In order that this increase does not lead to an increase in the time for establishing the difference signal, the subtraction of the correction signal is made with a delay Δt*, equal to the product of the time constant of the low-pass filter τ by the logarithm of the ratio of the amplitudes A₁(f_i,t) and A₂(f_i,t), which determines the time to establish the difference signal, which is the output signal of the analyzer. .;EFFECT: providing a specified accuracy in determining the frequencies and amplitudes and the permissible ripple level of the signal under study while maintaining the required analysis time.;1 cl, 4 dwg