NASA NTRS · 19740020290
Differential phonograms
Abstract
A new noise measuring method is outlined that is based on electronic analysis of the radiated noise. Non-relevant components are suppressed, while the differential phonogram displayed on the oscilloscope screen discloses the information carrying components. It allows low skilled operators to perform: (1) correct alignment of equipment; (2) detection of incipient failure; and (3) checking of prototypes.
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Halpert, E., Beuran, N.. 1974-06-01. Differential phonograms. https://ntrs.nasa.gov/citations/19740020290
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