A distortion-free transformation of an arbitrary signal consists in the scaled copying of the initial signal with a possible identical time delay. However, some concepts and interpretations accepted in physics and acoustics and used to justify the sufficiency of the amplitude-spectral representation of the reproduction quality require an essential revision. The parameters of motion are determined in mechanics as the derivatives of a known displacement. In reality, the velocity and the displacement are determined by sequential integration of the acceleration with respect to time. This leads to the appearance of integration constants complementing the initial signal. The values of these constants depend on the state of the oscillatory system at the initial moment of arrival of the next signal, which violates the invariance of the system with respect to time. The definition of the intermodulation distortions in the IEC terminology does not take into account the physical features of the parametric distortions due to Doppler intermodulation. These distortions are sometimes assigned with nonlinear distortions. A concepts revision seems to be most expedient steps in solving the problem of increasing the reliability of sound reproduction.
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