A New Principle of Sound Frequency Analysis (1932)
NASA Technical Reports Server (NTRS) · leaf 12
senting the unlmown complex frequencies appear at 540 and 300 cycles per second, current supphes a certain energy S/n^/? to the filament respectively, corresponding to one impluse for each of of the multipher. The known current i from the the blades, or to a frequency six times greater than the… … Figure ll.— Diagram of the original N. A, C. A. sound analyzer tained by plotting plate current against filament cur- interest to notice that no basic frequency corresponding rent (fig. 5) is thus dependent on the total energy level. to the number of revolutions of the propeller appears The energy…
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