into the analog computer: 



1. Addition of signals, 



2. Differentiation, 



3. Multiplication, and 



4. Phase shifting. 



After completion of the SEADAC, as described, there will be two 

 alternative methods of treating data (Figure 12) : 



1. Auto-Spectra 



a. The energy spectrum of each of two signals. 



b. The total energy in each of two signals. 



2. Cross- Spectra 



a. The energy spectrum of each of two signals. 



b. The CO- spectrum (in- phase) of the two signals. 



c. The quad-spectrum (90 out-of-phase) of the two signals. 

 In the prospective form discussed in this section, the data-processing 



method employed by the SEADAC may be considered to be comprised of three 

 separate operations, as shown in Figure 12: 



1. Data collection. 



2. Data preparation. 



3. Data analysis. 



The sole interdependence of these operations is in the necessity 

 for each operation to provide work for the succeeding operation. As long 

 as each operation has data on which to operate, it is completely independent 

 of the others. 



It is possible that the system as outlined here will sometimes suffer 



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