procedures for the analysis of recorded signals from them at least a significant value to select automatically

摘要

The pseudo-period corresponding to the inverse of the dominant frequency of the frequency spectrum is determined and binary coded relative to a first threshold value (TH1). The coded signals are summed through a sliding window to give an integral signal (S) and a second threshold value (TH2). The significant instant is located when the corresponding integral signal reaches the second threshold value The location of the significant instant of each signal involves determining a first reference point where the amplitude of the corresponding integral signal is equal to the second threshold value. A first intermediate instant (LP0) is detected between this first reference point and the nearest milestone on the integral signal. A second intermediate instant is detected between the first intermediate instant and the opposite milestone of the integral signal, where a first maximum (SM) of this integral signal exceeds a third threshold value (TH3) depending on the acquired signal. The significant instant is located at a quarter pseudo-period from the second intermediate instant. The significant instant is the first arrival of each acquired signal or the end of each acquired signal. The signals between these instants are isolated on the recording of the data. Each part of the data between two such instants is isolated so all the separate arrivals are identified for each detector. The polarisation of the signals is also detected so compression waves, sent waves and multiplets can be identified.