This article is devoted to the analysis of digital pulse infrarespiratory modulations (IRM). Digital photosphigmogram (DPSG) was used with the Fourier's integral. After the experimentation process, DPSG amplitude Spec-programs (SG) resulted for the state of physiological rest and for the process of the functional test of cooling. Many peaks on the SG appeared during the test. There is practically no difference in the SG and the spectrum of the range of random numbers. It doesn't seem possible to connect amplitude frequency characteristics of SG with any of processes going on in the human organism. It is suggested that the synchronous detectoring method be used to analyze the IRM DPSG.