Techniques for evidencing the respiratory patterns and their temporal shift.

To enhance the efficiency of de visu or automatic detection and analysis of of the respiratory patterns, new techniques are introduced to process the respiratory signals. These techniques include: the dynamical frequency analysis, spectral envelope detection, three-dimensional representation of the spectral envelopes, and the 'respirogram'.

Frequency analysis of the acoustical respiratory response.

The frequency-domain analysis of respiration is used to put in evidence the respiratory reflexes, mainly the acoustical respiratory reflex. Based on the envelope of the spectrum, numerical parameters of the respiration are introduced and applied to determine respiratory patterns. The use of respirograms is also suggested.